US3784284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens system for close up photography
Assignee: Nikon Corp
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Filing: 1971-07-22
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Granted: 1974-01-08
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Expires: 1991-07-22
Abstract
Abstract A zoom lens comprising a magnification varying system consisting of three lens groups of converging, diverging and converging types, respectively, at least one of the three lens groups being a focusing lens group, a relay lens disposed rearwardly of the magnification varying system and consisting of two lens groups. A stop and a beam splitter are both disposed between the two lens groups forming the relay lens, the third of the three lens groups in the magnification varying system being adapted to be individually advanced by a predetermined amount for its respective magnification varying positions, whereby an ultrashort shot can be accomplished.
Inventors
- 👤 S Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:45
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
398 words
A zoom lens system of the class described capable of effecting photography over a substantial photographic distance including an ultra close up range, comprising: a magnification varying system including three lens groups of converging, diverging and converging types, respectively, the first lens group of said three lens groups being a focusing lens group, the second and third lens groups of said three lens groups being movable for varying magnification; a relay lens disposed rearwardly of said magnification varying system and including two lens groups; the third of said three lens groups in said magnification varying system being adapted to be individually shifted a predetermined amount along the optic axis of the system from its respective magnification varying positions, said lens system having substantially the following values; r 1 85.943 d 1 1.4 n 1 1.74077 Nu 1 27.7 r 2 40.600 1st Group d 2 9.5 n 2 1.65160 Nu 2 58.5 (L1) r 3 -292.56 f1 75.2 d 3 0.1 r 4 42.962 d 4 3.4 n 3 1.5168 Nu 3 64.2 r 5 69.590 d 5 1.73 - 22.43 - 33.23 r 6 205.15 d 6 0.9 n 4 1.717 Nu 4 47.9 r 7 17.2 2nd Group d 7 5.0 (L2) r 8 -28.4 f2 -15.75 d 8 0.8 n 5 1.51835 Nu 5 60.3 r 9 17.558 d 9 3.3 n 6 1.72825 Nu 6 28.3 r10 52.125 d10 45.72 - 20.37 - 2.96 r 11 86.894 d11 2.9 n 7 1.6516 Nu 7 58.3 r12 -33.490 3rd Group d12 0.1 (L3) r13 25.000 f3 19.31 d13 5.5 n 8 1.65830 Nu 8 57.3 r14 -17.2 d14 0.9 n 9 1.72342 Nu 9 38.0 r15 -254.65 d15 1.47 - 6.12 - 12.73 r16 -24.05 d16 0.8 n10 1.65830 Nu 10 57.3 r17 24.05 d17 0.85 r18 infinity d18 8.3 n11 1.57501 Nu 11 41.3 r19 infinity Relay Lens d19 8.9 (L4,L5) r20 1100.000 d20 3.9 n12 1.62374 Nu 12 47.0 r21 -17.335 d21 0.2 r22 17.9 d22 5.3 n13 1.62041 Nu 13 60.3 r23 -14.53 d23 1.2 n14 1.80518 Nu 14 25.5 r24 174.6 wherein, r represents the radii of curvature of lenses, d the center thicknesses and air gaps of lenses n the refractive indices of the lens glasses for d-ray, Nu the Abbe numbers of the lens glasses, and suffix numbers represent the order of each lens as viewed from the object.
Claim 2
Dependent Claim
398 words
A zoom lens system of the class described capable of effecting photography over a substantial photographic distance including an ultra close up range, comprising: a magnification varying system including three lens groups of converging, diverging and converging types, respectively, the first lens group of said three lens groups being a focusing lens group, the second and third lens groups of said three lens groups being movable for varying magnification; a relay lens disposed rearwardly of said magnification varying system and including two lens groups; the third of said three lens groups in said magnification varying system being adapted to be individually shifted a predetermined amount along the optic axis of the system from its respective magnification varying positions, said lens system having substantially the following values; r 1 85.943 d 1 1.4 n 1 1.74077 Nu 1 27.7 r 2 40.600 1st Group d 2 9.5 n 2 1.65160 Nu 2 58.5 (L1) r 3 -292.56 f1 75.2 d 3 0.1 r 4 42.962 d 4 3.4 n 3 1.5168 Nu 3 64.2 r 5 69.590 d 5 1.73 - 22.43 - 33.23 r 6 205.15 d 6 0.9 n 4 1.717 Nu 4 47.9 r 7 17.2 2nd Group d 7 5.0 (L2) r 8 -28.4 f2 -15.75 d 8 0.8 n 5 1.51835 Nu 5 60.3 r 9 17.558 d 9 3.3 n 6 1.72825 Nu 6 28.3 r10 52.125 d10 45.72 - 20.37 - 2.96 r 11 86.894 d11 2.9 n 7 1.6516 Nu 7 58.3 r12 -33.490 3rd Group d12 0.1 (L3) r13 25.000 f3 19.31 d13 5.5 n 8 1.65830 Nu 8 57.3 r14 -17.2 d14 0.9 n 9 1.72342 Nu 9 38.0 r15 -254.65 d15 1.47 - 6.12 - 12.73 r16 -24.05 d16 0.8 n10 1.65830 Nu 10 57.3 r17 24.05 d17 0.85 r18 infinity d18 8.3 n11 1.57501 Nu 11 41.3 r19 infinity Relay Lens d19 8.9 (L4,L5) r20 1100.000 d20 3.9 n12 1.62374 Nu 12 47.0 r21 -17.335 d21 0.2 r22 17.9 d22 5.3 n13 1.62041 Nu 13 60.3 r23 -14.53 d23 1.2 n14 1.80518 Nu 14 25.5 r24 174.6 wherein, r represents the radii of curvature of lenses, d the center thicknesses and air gaps of lenses n the refractive indices of the lens glasses for d-ray, Nu the Abbe numbers of the lens glasses, and suffix numbers represent the order of each lens as viewed from the object.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |