US5541773A
Expired / Lapsed
US
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Two-unit zoom lens system
Assignee: Olympus Corp
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Filing: 1994-03-25
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Granted: 1996-07-30
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Expires: 2014-03-25
Abstract
Abstract A low-cost, high-performance two-unit zoom lens system for use with a compact camera, which has a zoom ratio of about 2 to 2.5. The zoom lens system has a 1-st lens unit (G1) of positive power, and a 2-nd lens unit (G2) of negative power. The 1-st lens unit (G1) is composed of a plastic lens (L1) of extremely small power having an aspherical surface, and a positive lens group consisting of lens elements (L2) and (L3). The 2-nd lens unit (G2) is composed of a positive lens (L4), and a negative lens (L5) having an aspherical surface.
Inventors
- 👤 Yuji Kamo
- 👤 Hideyasu Takato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:42
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/142; G02B15/1421
Claims Analysis
Total Claims: 112
Claim 1
Independent Claim
123 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 2
Dependent Claim
123 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 3
Dependent Claim
90 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 4
Dependent Claim
90 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 5
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f w is a focal length of said two-unit zoom lens system at a wide end.
Claim 6
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f w is a focal length of said two-unit zoom lens system at a wide end.
Claim 7
Dependent Claim
93 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop.; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 8
Dependent Claim
93 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop.; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 9
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 10
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 11
Dependent Claim
114 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 12
Dependent Claim
114 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 13
Dependent Claim
136 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.4<f.sub.T /f.sub.1 <0.4 (3') where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 14
Dependent Claim
136 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: an aspherical lens of extremely small power having an aspherical surface, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.4<f.sub.T /f.sub.1 <0.4 (3') where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 15
Dependent Claim
33 words
A two-unit zoom lens system according to one of claim 1, 2, 3, 4 or 5, wherein: said negative lens in said 2-nd lens unit has an aspherical surface on the object side.
Claim 16
Dependent Claim
135 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 17
Dependent Claim
135 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 18
Dependent Claim
130 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 19
Dependent Claim
130 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 20
Dependent Claim
132 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 21
Dependent Claim
132 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 22
Dependent Claim
102 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 23
Dependent Claim
102 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 24
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 25
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 26
Dependent Claim
92 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 27
Dependent Claim
92 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 28
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 29
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 30
Dependent Claim
95 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 31
Dependent Claim
95 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 32
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 33
Dependent Claim
35 words
6<F 1 /f W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 34
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 35
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 36
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 37
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 38
Dependent Claim
131 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 39
Dependent Claim
131 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.6<F.sub.1 /f.sub.W <0.9 (1) where F 1 is a focal length of said 1-st lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 40
Dependent Claim
102 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition:
Claim 41
Dependent Claim
102 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition:
Claim 42
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 43
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 44
Dependent Claim
98 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 45
Dependent Claim
98 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 46
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 47
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 48
Dependent Claim
99 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 49
Dependent Claim
99 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 50
Dependent Claim
35 words
5<|F 2 |f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 51
Dependent Claim
35 words
5<|F 2 |f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 52
Dependent Claim
135 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 53
Dependent Claim
135 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 54
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |/f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 55
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |/f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 56
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |/f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 57
Dependent Claim
128 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition: 0.5<|F.sub.2 |/f.sub.W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 58
Dependent Claim
95 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 59
Dependent Claim
95 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 60
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 61
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 62
Dependent Claim
94 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition:
Claim 63
Dependent Claim
94 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: positive lens, and a negative lens having an aspherical surface on the object side thereof; said two-unit zoom lens system satisfying the following condition:
Claim 64
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 65
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 66
Dependent Claim
98 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 67
Dependent Claim
98 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said two-unit zoom lens system satisfying the following condition:
Claim 68
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 69
Dependent Claim
35 words
5<|F 2 |/f W <0.9 (2) where F 2 is a focal length of said 2-nd lens unit, and f W is a focal length of said two-unit zoom lens system at a wide end.
Claim 70
Dependent Claim
147 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 71
Dependent Claim
147 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 72
Dependent Claim
143 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 73
Dependent Claim
143 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 74
Dependent Claim
144 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 75
Dependent Claim
144 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 76
Dependent Claim
104 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 77
Dependent Claim
104 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 78
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 79
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 80
Dependent Claim
94 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 81
Dependent Claim
94 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 82
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 83
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 84
Dependent Claim
97 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 85
Dependent Claim
97 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition:
Claim 86
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 87
Dependent Claim
46 words
-0. 9<f T /f 1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 88
Dependent Claim
140 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 89
Dependent Claim
140 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 90
Dependent Claim
140 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 91
Dependent Claim
140 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 92
Dependent Claim
143 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 93
Dependent Claim
143 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power satisfying the following condition: -0.9<f.sub.T /f.sub.1 <0.9 (3) where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 94
Dependent Claim
74 words
A two-unit zoom lens system according to one of claims 16-33, wherein upper and lower limits of said conditional expression f T /f 1 are limited as given in the following expression: -0.4<f.sub.T /f.sub.1 <0.4 where f T is a focal length of said two-unit zoom lens system at a tele end, and f 1 is a focal length of the lens in said 1-st lens unit that is closest to the object side.
Claim 95
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 96
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, and a positive lens group; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 97
Dependent Claim
121 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 98
Dependent Claim
121 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a concave surface directed toward the object side, a positive lens group, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 99
Dependent Claim
122 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 100
Dependent Claim
122 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 101
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 102
Dependent Claim
125 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface with a convex surface directed toward the object side, a negative lens, a positive lens, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 103
Dependent Claim
115 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 104
Dependent Claim
115 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 105
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 106
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a positive lens, and a stop; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 107
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 108
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a negative lens, a positive lens, a stop, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 109
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 110
Dependent Claim
118 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a positive lens, and a negative lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface on the object side thereof; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 111
Dependent Claim
121 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
Claim 112
Dependent Claim
121 words
A two-unit zoom lens system comprising, in order from an object side: a 1-st lens unit of positive power, said 1-st lens unit being composed, in order from the object side, of: a lens of extremely small power having an aspherical surface, a cemented lens of a pair of negative and positive lenses, and a positive lens; and a 2-nd lens unit of negative power, said 2-nd lens unit being composed, in order from the object side, of: a positive lens, and a negative lens having an aspherical surface; said aspherical lens of extremely small power having a negative power which becomes stronger as a distance from an optical axis of said two-unit zoom lens system increases toward a periphery thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |