US3622227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrofocus-type wide-angle camera lens
Assignee: Individual
•
Filing: 1969-12-24
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Granted: 1971-11-23
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Expires: 1989-12-24
Abstract
Abstract A retrofocus-type wide-angle camera lens is provided in which the back focus is especially long compared to the composite focal length. The lens comprises a front lens group having a negative composite focal length and a rear lens group consisting of a cemented positive lens, a negative single lens, a composite positive meniscus lens, and a single positive lens. The lens thus provided has an aperture ratio of F/2.8 and a viewing angle of over 80* with various aberrations, coma, curvature of the field and distortion highly corrected.
Inventors
- 👤 Yoshiyuki Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:13
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A retrofocus-type wide angle camera lens system, of which the numerical data is as follows: Focal length f 1.0 Back Focal Length B.f 1.5597 Angle of Field 2 Omega 84* Aperture Ratio F:2.8 r1 +2.5000 nd vd d1 0.1125 n1 1.62041 60.3 r2 +0.8958 d2 0.2625 r3 +3.7500 d3 0.2292 n2 1.62041 60.3 r4 -3.7500 d4 0.0042 r5 +1.2500 d5 0.1125 n3 1.62041 60.3 r6 +0.4583 d6 0.4083 r7 +1.0521 d7 0.1667 n4 1.62004 36.3 r8 -0.7742 d8 0.1250 n5 1.51823 59.0 r9 -1.4542 d9 0.1042 r10 -3.5417 d10 0.2208 n6 1.7847 r11 +1.3500 d11 0.0979 r12 -5.0000 d12 0.0417 n7 1.7847 26.1 r13 +1.1729 d13 0.2250 n8 1.62041 60.3 r14 -0.8333 d14 0.0042 r15 +8.0000 d15 0.1458 n9 1.744 44.9 r16 -1.9423 wherein r1r2. . . . . represent the radii of curvature of the respective elements; d1d2. . . . . represent the axial thicknesses of the respective elements and the air spaces of the adjacent elements; n1n2 . . . . represent the refractive indices of the respective elements; and vd. . . . represent the Abbe Numbers of the respective elements.
Claim 2
Dependent Claim
185 words
A retrofocus-type wide angle camera lens system, of which the numerical data is as follows: Focal length f 1.0 Back Focal Length B.f 1.5597 Angle of Field 2 Omega 84* Aperture Ratio F:2.8 r1 +2.5000 nd vd d1 0.1125 n1 1.62041 60.3 r2 +0.8958 d2 0.2625 r3 +3.7500 d3 0.2292 n2 1.62041 60.3 r4 -3.7500 d4 0.0042 r5 +1.2500 d5 0.1125 n3 1.62041 60.3 r6 +0.4583 d6 0.4083 r7 +1.0521 d7 0.1667 n4 1.62004 36.3 r8 -0.7742 d8 0.1250 n5 1.51823 59.0 r9 -1.4542 d9 0.1042 r10 -3.5417 d10 0.2208 n6 1.7847 r11 +1.3500 d11 0.0979 r12 -5.0000 d12 0.0417 n7 1.7847 26.1 r13 +1.1729 d13 0.2250 n8 1.62041 60.3 r14 -0.8333 d14 0.0042 r15 +8.0000 d15 0.1458 n9 1.744 44.9 r16 -1.9423 wherein r1r2. . . . . represent the radii of curvature of the respective elements; d1d2. . . . . represent the axial thicknesses of the respective elements and the air spaces of the adjacent elements; n1n2 . . . . represent the refractive indices of the respective elements; and vd. . . . represent the Abbe Numbers of the respective elements.
Claim 3
Dependent Claim
182 words
A retrofocus-type wide angle camera lens, of which the numerical data is as follows: Focal Length f 1.0 Back Focal Length B.f 1.5032 Angle of Field 2 Omega 80* Aperture Ratio F:2.8 nd vd r1 +2.0873 d1 0.180 n1 1.62041 60.3 r2 +0.7842 d2 0.300 r3 +4.6000 d3 0.552 n2 1.6228 56.9 r4 -2.9420 d4 0.004 r5 +1.1160 d5 0.092 n3 1.58913 61.2 r6 +0.4520 d6 0.232 r7 +0.8400 d7 0.200 n4 1.57501 41.3 r8 -0.8400 d8 0.054 n5 1.56248 50.9 r9 -1.4709 d9 0.088 r10 -40.000 d10 0.160 n6 1.51823 59.0 r11 +0.9280 d11 0.112 r12 -0.9200 d12 0.028 n7 1.7847 26.1 r13 +1.1768 d13 0.180 n8 1.6679 55.5 r14 -0.7440 d14 0.004 r15 -8.8000 d15 0.104 n9 1.76684 46.2 r16 -0.9616 wherein r1r2. . . . .represent the radii of curvature of the respective elements; d1d2. . . . .represent the axial thicknesses of the respective elements and the air spaces of the adjacent elements; n1n2. . . . .represent the refractive indices of the respective elements; and vd. . . . .represent the Abbe Numbers of the respective elements.
Claim 4
Dependent Claim
182 words
A retrofocus-type wide angle camera lens, of which the numerical data is as follows: Focal Length f 1.0 Back Focal Length B.f 1.5032 Angle of Field 2 Omega 80* Aperture Ratio F:2.8 nd vd r1 +2.0873 d1 0.180 n1 1.62041 60.3 r2 +0.7842 d2 0.300 r3 +4.6000 d3 0.552 n2 1.6228 56.9 r4 -2.9420 d4 0.004 r5 +1.1160 d5 0.092 n3 1.58913 61.2 r6 +0.4520 d6 0.232 r7 +0.8400 d7 0.200 n4 1.57501 41.3 r8 -0.8400 d8 0.054 n5 1.56248 50.9 r9 -1.4709 d9 0.088 r10 -40.000 d10 0.160 n6 1.51823 59.0 r11 +0.9280 d11 0.112 r12 -0.9200 d12 0.028 n7 1.7847 26.1 r13 +1.1768 d13 0.180 n8 1.6679 55.5 r14 -0.7440 d14 0.004 r15 -8.8000 d15 0.104 n9 1.76684 46.2 r16 -0.9616 wherein r1r2. . . . .represent the radii of curvature of the respective elements; d1d2. . . . .represent the axial thicknesses of the respective elements and the air spaces of the adjacent elements; n1n2. . . . .represent the refractive indices of the respective elements; and vd. . . . .represent the Abbe Numbers of the respective elements.
References Cited (Backward Citations)
FR83412E
Cited
FR1396907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |