US4157212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large aperture miniature wide-angle zoom lens system
Assignee: Pentax Corp
•
Filing: 1977-09-21
•
Granted: 1979-06-05
•
Expires: 1997-09-21
Abstract
Abstract A large aperture miniature wide-angle zoom lens system is constructed as a two component-type lens system comprising a front lens group which is movable relative to a rear lens group. The front lens group is composed of four lens elements, and the rear lens group is composed of either five or six lens elements. In order from the object side to the image side, the first lens is a positive lens having its surface of greater curvature directed toward the object. The second lens is a negative meniscus lens, and the third lens is a double concave lens. The surfaces of greater curvature of both the second and third lenses are directed toward the image. The fourth lens is a positive lens having its surface of greater curvature directed toward the object. The front lens group composed of the first, second, third and fourth lenses has a negative resultant focal length. The rear lens group has a positive resultant focal length and comprises a double concave lens and first and second positive lens components respectively positioned on the object and image sides of the double concave lens. The first positive lens component includes at least two positive lenses, one of which is a double convex lens. The second positive lens component includes two positive lenses, the surfaces of greater curvature of which are directed toward the image.
Inventors
- 👤 Ryota Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:53
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/142
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
364 words
A large aperture miniature wide-angle zoom lens system constructed in two components comprising a front lens group which is relatively movable with respect to a rear lens group, said front lens group being composed of four lens elements and said rear lens group being composed of five lens elements, said lens elements in order from the object side to the image side being a positive lens L 1 , a negative meniscus lens L 2 , a double concave lens L 3 , a positive lens L 4 , a double convex lens L 5 , a thick positive lens L 6 , a double concave lens L 7 and two positive lenses L 8 and L 9 , the radii of curvature r 1 to r 18 , the thicknesses or separations d 1 to d 17 , the refractive indicies n 1 to n 9 and the Abbe numbers ν 1 to ν 9 satisfying the following conditions: ______________________________________
Aperture Ratio 1:2.86
Focal Length f = 28.8 ˜ 44.0
Angle of View 2ω = 75.2° ˜ 52.3°
Thickness
Radius of or Index of Abbe
Lens Curvature Spacing Refraction
Number
______________________________________
r.sub.1 =
73.187
L.sub.1 d.sub.1 = 3.60
n.sub.1 = 1.58913
ν.sub.1 = 61.1
r.sub.2 =
339.741
d.sub.2 = 0.10
r.sub.3 =
90.633
L.sub.2 d.sub.3 = 1.60
n.sub.2 = 1.80610
ν.sub.2 = 40.9
r.sub.4 =
19.167
d.sub.4 = 7.46
r.sub.5 =
-400.000
L.sub.3 d.sub.5 = 1.60
n.sub.3 = 1.64000
ν.sub.3 = 60.2
r.sub.6 =
49.487
d.sub.6 = 3.26
r.sub.7 =
34.000
L.sub.4 d.sub.7 = 3.00
n.sub.4 = 1.80518
ν.sub.4 = 25.4
r.sub.8 =
94.650
d.sub.8 = 19.829 ˜ 2.040 (variable)
r.sub.9 =
81.015
L.sub.5 d.sub.9 = 3.00
n.sub.5 = 1.77250
ν.sub.5 = 49.7
r.sub.10 =
-66.820
d.sub.10 = 2.03
r.sub.11 =
21.500
L.sub.6 d.sub.11 = 7.00
n.sub.6 = 1.65844
ν.sub.6 = 50.9
r.sub.12 =
94.396
d.sub.12 = 1.99
r.sub.13 =
-62.900
L.sub.7 d.sub.13 = 4.28
n.sub.7 = 1.84666
ν.sub.7 = 23.9
r.sub.14 =
21.928
d.sub.14 = 3.59
r.sub.15 =
-350.000
L.sub.8 d.sub.15 = 2.60
n.sub.8 = 1.58267
ν.sub.8 = 46.4
r.sub.16 =
-31.044
d.sub.16 = 0.10
r.sub.17 =
-250.000
L.sub.9 d.sub.17 = 3.16
n.sub.9 = 1.51633
ν.sub.9 = 64.1
r.sub.18 =
-28.889
______________________________________
Claim 2
Dependent Claim
364 words
A large aperture miniature wide-angle zoom lens system constructed in two components comprising a front lens group which is relatively movable with respect to a rear lens group, said front lens group being composed of four lens elements and said rear lens group being composed of five lens elements, said lens elements in order from the object side to the image side being a positive lens L 1 , a negative meniscus lens L 2 , a double concave lens L 3 , a positive lens L 4 , a double convex lens L 5 , a thick positive lens L 6 , a double concave lens L 7 and two positive lenses L 8 and L 9 , the radii of curvature r 1 to r 18 , the thicknesses or separations d 1 to d 17 , the refractive indicies n 1 to n 9 and the Abbe numbers ν 1 to ν 9 satisfying the following conditions: ______________________________________
Aperture Ratio 1:2.86
Focal Length f = 28.8 ˜ 44.0
Angle of View 2ω = 75.2° ˜ 52.3°
Thickness
Radius of or Index of Abbe
Lens Curvature Spacing Refraction
Number
______________________________________
r.sub.1 =
73.187
L.sub.1 d.sub.1 = 3.60
n.sub.1 = 1.58913
ν.sub.1 = 61.1
r.sub.2 =
339.741
d.sub.2 = 0.10
r.sub.3 =
90.633
L.sub.2 d.sub.3 = 1.60
n.sub.2 = 1.80610
ν.sub.2 = 40.9
r.sub.4 =
19.167
d.sub.4 = 7.46
r.sub.5 =
-400.000
L.sub.3 d.sub.5 = 1.60
n.sub.3 = 1.64000
ν.sub.3 = 60.2
r.sub.6 =
49.487
d.sub.6 = 3.26
r.sub.7 =
34.000
L.sub.4 d.sub.7 = 3.00
n.sub.4 = 1.80518
ν.sub.4 = 25.4
r.sub.8 =
94.650
d.sub.8 = 19.829 ˜ 2.040 (variable)
r.sub.9 =
81.015
L.sub.5 d.sub.9 = 3.00
n.sub.5 = 1.77250
ν.sub.5 = 49.7
r.sub.10 =
-66.820
d.sub.10 = 2.03
r.sub.11 =
21.500
L.sub.6 d.sub.11 = 7.00
n.sub.6 = 1.65844
ν.sub.6 = 50.9
r.sub.12 =
94.396
d.sub.12 = 1.99
r.sub.13 =
-62.900
L.sub.7 d.sub.13 = 4.28
n.sub.7 = 1.84666
ν.sub.7 = 23.9
r.sub.14 =
21.928
d.sub.14 = 3.59
r.sub.15 =
-350.000
L.sub.8 d.sub.15 = 2.60
n.sub.8 = 1.58267
ν.sub.8 = 46.4
r.sub.16 =
-31.044
d.sub.16 = 0.10
r.sub.17 =
-250.000
L.sub.9 d.sub.17 = 3.16
n.sub.9 = 1.51633
ν.sub.9 = 64.1
r.sub.18 =
-28.889
______________________________________
Claim 3
Dependent Claim
381 words
A large aperture miniature wide-angle zoom lens system constructed in two components comprising a front lens group which is relatively movable with respect to a rear lens group, asid front lens group being composed of four lens elements and said rear lens group being composed of six lens elements, said lens elements in order from the object side to the image side being a positive lens L 1 , a negative meniscus lens L 2 , a double concave lens L 3 , a positive lens L 4 , a double convex lens L 5 , two positive lenses L 6 and L 7 , a double concave lens L 8 , and two positive lenses L 9 and L 10 , the radii of curvature r 1 to r 20 , the thicknesses or separations d 1 to d 19 , the refractive indicies n 1 to n 10 and the Abbe numbers ν 1 to ν 10 satisfying the following conditions: __________________________________________________________________________
Aperture Ratio 1:2.86
Focal Length f=28.8 ˜ 44.0
Angle of View 2ω=75.4° ˜ 52.3°
Radius of Thickness or
Index of Abbe
Lens
Curvature Spacing
Refraction Number
__________________________________________________________________________
r.sub.1 = 75.683
L.sub.1 d.sub.1 = 3.50
n.sub.1 = 1.58913
ν.sub.1 = 61.1
r.sub.2 = 338.844
d.sub.2 = 0.10
r.sub.3 = 87.044
L.sub.2 d.sub.3 = 1.60
n.sub.2 = 1.80610
ν.sub.2 = 40.9
r.sub.4 = 19.287
d.sub.4 = 7.52
r.sub.5 = -346.012
L.sub.3 d.sub.5 = 1.60
n.sub.3 = 1.63854
ν.sub.3 = 55.4
r.sub.6 = 50.380
d.sub.6 = 3.44
r.sub.7 = 33.891
L.sub.4 d.sub.7 = 3.00
n.sub.4 = 1.80518
ν.sub.4 = 25.4
r.sub.8 = 91.382
d.sub.8 = 19.379
˜1.3672 (variable)
r.sub.9 = 84.091
L.sub.5 d.sub.9 = 3.00
n.sub.5 = 1.77250
ν.sub.5 = 49.7
r.sub.10 = -66.231
d.sub.10 = 2.03
r.sub.11 = 22.400
L.sub.6 d.sub.11 = 2.90
n.sub.6 = 1.77250
ν.sub.6 = 49.7
r.sub.12 = 39.960
d.sub.12 = 1.51
r.sub.13 = 36.477
L.sub.7 d.sub.13 = 2.40
n.sub.7 = 1.51633
ν.sub.7 = 64.1
r.sub.14 = 90.848
d.sub.14 = 2.00
r.sub.15 = -61.633
L.sub.8 d.sub.15 = 4.27
n.sub.8 = 1.84666
ν.sub.8 = 23.9
r.sub.16 = 22.259
d.sub.16 = 3.56
r.sub.17 = -336.917
L.sub.9 d.sub.17 = 2.60
n.sub.9 = 1.62045
ν.sub.9 = 38.1
r.sub.18 = -34.268
d.sub.18 = 0.10
r.sub.19 = -384.302
L.sub.10 d.sub.19 = 3.16
n.sub.10 = 1.51633
ν.sub.10 = 64.1
r.sub.20 = -27.879
__________________________________________________________________________
Claim 4
Dependent Claim
381 words
A large aperture miniature wide-angle zoom lens system constructed in two components comprising a front lens group which is relatively movable with respect to a rear lens group, asid front lens group being composed of four lens elements and said rear lens group being composed of six lens elements, said lens elements in order from the object side to the image side being a positive lens L 1 , a negative meniscus lens L 2 , a double concave lens L 3 , a positive lens L 4 , a double convex lens L 5 , two positive lenses L 6 and L 7 , a double concave lens L 8 , and two positive lenses L 9 and L 10 , the radii of curvature r 1 to r 20 , the thicknesses or separations d 1 to d 19 , the refractive indicies n 1 to n 10 and the Abbe numbers ν 1 to ν 10 satisfying the following conditions: __________________________________________________________________________
Aperture Ratio 1:2.86
Focal Length f=28.8 ˜ 44.0
Angle of View 2ω=75.4° ˜ 52.3°
Radius of Thickness or
Index of Abbe
Lens
Curvature Spacing
Refraction Number
__________________________________________________________________________
r.sub.1 = 75.683
L.sub.1 d.sub.1 = 3.50
n.sub.1 = 1.58913
ν.sub.1 = 61.1
r.sub.2 = 338.844
d.sub.2 = 0.10
r.sub.3 = 87.044
L.sub.2 d.sub.3 = 1.60
n.sub.2 = 1.80610
ν.sub.2 = 40.9
r.sub.4 = 19.287
d.sub.4 = 7.52
r.sub.5 = -346.012
L.sub.3 d.sub.5 = 1.60
n.sub.3 = 1.63854
ν.sub.3 = 55.4
r.sub.6 = 50.380
d.sub.6 = 3.44
r.sub.7 = 33.891
L.sub.4 d.sub.7 = 3.00
n.sub.4 = 1.80518
ν.sub.4 = 25.4
r.sub.8 = 91.382
d.sub.8 = 19.379
˜1.3672 (variable)
r.sub.9 = 84.091
L.sub.5 d.sub.9 = 3.00
n.sub.5 = 1.77250
ν.sub.5 = 49.7
r.sub.10 = -66.231
d.sub.10 = 2.03
r.sub.11 = 22.400
L.sub.6 d.sub.11 = 2.90
n.sub.6 = 1.77250
ν.sub.6 = 49.7
r.sub.12 = 39.960
d.sub.12 = 1.51
r.sub.13 = 36.477
L.sub.7 d.sub.13 = 2.40
n.sub.7 = 1.51633
ν.sub.7 = 64.1
r.sub.14 = 90.848
d.sub.14 = 2.00
r.sub.15 = -61.633
L.sub.8 d.sub.15 = 4.27
n.sub.8 = 1.84666
ν.sub.8 = 23.9
r.sub.16 = 22.259
d.sub.16 = 3.56
r.sub.17 = -336.917
L.sub.9 d.sub.17 = 2.60
n.sub.9 = 1.62045
ν.sub.9 = 38.1
r.sub.18 = -34.268
d.sub.18 = 0.10
r.sub.19 = -384.302
L.sub.10 d.sub.19 = 3.16
n.sub.10 = 1.51633
ν.sub.10 = 64.1
r.sub.20 = -27.879
__________________________________________________________________________
References Cited (Backward Citations)
DE2557547A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |