Patent US4963010A successfully refreshed from Google Patents.
US4963010A
Expired / Lapsed
US
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Compact zoom lens system
Assignee: Olympus Corp
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Filing: 1989-08-11
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Granted: 1990-10-16
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Expires: 2009-08-11
Abstract
Abstract A compact zoom lens system consisting of a small number of lens elements and having a short total length, said zoom lens system comprising a first lens unit having positive refractive power and a second lens unit having negative refractive power which are arranged in the order from the object side, an aperture stop arranged in said first lens unit, at least one lens component arranged after said aperture stop in said first lens unit and at least one graded refractive index lens having refractive index gradient in the direction perpendicular to the optical axis in said first lens unit.
Inventors
- 👤 Juro Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:33
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/142; G02B15/1421
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
A compact zoom lens system comprising, in the order from the object side, a first lens unit having positive refractive power and a second lens unit having negative refractive power, and so adapted as to vary focal length thereof by varying the airspace reserved between said first lens unit and said second lens unit, said first lens unit comprising an aperture stop, at least one lens component arranged on the object side of said aperture stop and at least one lens component arranged on the image side of said aperture stop, and at least one lens element arranged in said first lens unit being designed as a radial GRIN lens.
Claim 2
Dependent Claim
110 words
A compact zoom lens system comprising, in the order from the object side, a first lens unit having positive refractive power and a second lens unit having negative refractive power, and so adapted as to vary focal length thereof by varying the airspace reserved between said first lens unit and said second lens unit, said first lens unit comprising an aperture stop, at least one lens component arranged on the object side of said aperture stop and at least one lens component arranged on the image side of said aperture stop, and at least one lens element arranged in said first lens unit being designed as a radial GRIN lens.
Claim 3
Dependent Claim
48 words
A compact zoom lens system according to claim 1 wherein said first lens unit comprises a first subunit having positive power and arranged on the object side of said aperture stop, and a second subunit having positive power and arranged on the image side of said aperture stop.
Claim 4
Dependent Claim
24 words
A compact zoom lens system according to claim 1 or 2 wherein said first lens unit comprises at least two graded refractive index lenses.
Claim 5
Dependent Claim
84 words
A compact zoom lens system according to claim 3 satisfying the following conditions (1) and (2): 0.1<d.sub.2 /d.sub.3 <1.7 (1) f.sub.1 /5<d.sub.2 +d.sub.3 <f.sub.1 /2 (2) wherein the reference symbol f 1 represents focal length of said first lens unit, the reference symbol d 2 designates the airspace reserved between the first subunit of said first lens unit and said aperture stop, and the reference symbol d3 denotes the airspace reserved between said aperture stop and the second subunit of said first lens unit.
Claim 6
Dependent Claim
32 words
A compact zoom lens system according to claim 4 satisfying the following condition (3): 0<1/f.sub.1.sbsb.F <0.007/f.sub.1 ( 3) wherein the reference symbol f 1 .sbsb.F represents focal length of said first subunit.
Claim 7
Dependent Claim
87 words
A compact zoom lens system according to claim 1 or 2 satisfying the following conditions (1) and (2): 0.1<d.sub.2 /d.sub.3 <1.7 (1) f.sub.1 /5<d.sub.2 +d.sub.3 <f.sub.1 /2 (2) wherein the reference symbol f 1 represents focal length of said first lens unit, the reference symbol d 2 designates the airspace reserved between the first subunit of said first lens unit and said aperture stop, and the reference symbol d 3 denotes the airspace reserved between said aperture stop and the second subunit of said first lens unit.
Claim 8
Dependent Claim
32 words
A compact zoom lens system according to claim 6 satisfying the following condition (3): 0<1/f.sub.1.sbsb.F <0.007/f.sub.1 ( 3) wherein the reference symbol f 1 .sbsb.F represents focal length of said first subunit.
Claim 9
Dependent Claim
25 words
A compact zoom lens system according to claim 1 wherein each of the lens components comprised in said first lens unit has positive refractive power.
Claim 10
Dependent Claim
29 words
A compact zoom lens system according to claim 2 wherein the surface having the strongest refractive power in said second subunit is concave with regard to said aperture stop.
Claim 11
Dependent Claim
35 words
A compact zoom lens system according to claim 1 wherein said second lens unit comprises a negative meniscus lens component arranged on the extremely image side and having a convex surface on the image side.
Claim 12
Dependent Claim
33 words
A compact zoom lens system according to claim 2 wherein both of the extremely object side surface and the extremely image side surface of said first subunit are convex on the object side.
Claim 13
Dependent Claim
60 words
A compact zoom lens system according to claim 1 wherein any one of the surfaces arranged in said zoom lens system is designed as an aspherical surface expressed by the following formula: ##EQU3## wherein the reference symbol r represents radius of curvature at the vertex of said aspherical surface and the reference symbol A i designates the aspherical surface coefficient.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
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