Patent US3738736A successfully refreshed from Google Patents.
US3738736A
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US
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Photographic lens system of great relative aperture
Assignee: Nikon Corp
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Filing: 1971-12-20
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Granted: 1973-06-12
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Expires: 1991-12-20
Abstract
Abstract A photographic lens system comprises seven components, which, as viewed in the direction of incidence of light, are a positive component convex to the object side of the lens, a positive component convex to the object side, a negative meniscus component convex to the object side, a negative component having its surface of greater curvature facing the object side, a positive component having its surface of greater curvature facing the image side, a positive meniscus component convex to the image side, and a positive component having its surface of greater curvature facing the object side. An aperture stop is interposed between the third and fourth components. The fourth and fifth components are joined together. The entire system satisfies predetermined conditions, thereby providing a relative aperture of F/1.2, an angle of view 46* and a back focus at least 0.7 times as long as the overall focal length of the system, while various aberrations therein are well corrected.
Inventors
- 👤 Y Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:17
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
A photographic lens system of great relative aperture comprising, as viewed in the direction of incidence of light, a first positive component convex to the object side of the system, a second positive meniscus component convex to said object side, a third negative meniscus component convex to said object side, a fourth negative component having its surface of greater curvature facing said object side, a fifth positive component having its surface of greater curvature facing the image side of the system, a sixth positive meniscus component having its surface of greater curvature facing said object side, said third and fourth component having an aperture stop interposed therebetween, said lens system satisfying the relationships: 0.7f < r1 < 1.5f 2f < r2 < infinity r6/1.1 < r7 < 1.1 r6 r3/1.1 < r9 < 1.1 r3 d6/1.1 < (r6 + r7 )/2 < 1.1 d6 (1 - n2)/r4 + (n3 - 1)/r5 < 0 0.6f < d3 + d4 + d5 + d6 + d7 + d8 < 0.8f where f represents the overall focal length of the lens system, r the radius of curvature of each surface of said components, d the intervertex distance between adjacent surfaces of said components, and n the refractive index of each of said components.
Claim 2
Dependent Claim
210 words
A photographic lens system of great relative aperture comprising, as viewed in the direction of incidence of light, a first positive component convex to the object side of the system, a second positive meniscus component convex to said object side, a third negative meniscus component convex to said object side, a fourth negative component having its surface of greater curvature facing said object side, a fifth positive component having its surface of greater curvature facing the image side of the system, a sixth positive meniscus component having its surface of greater curvature facing said object side, said third and fourth component having an aperture stop interposed therebetween, said lens system satisfying the relationships: 0.7f < r1 < 1.5f 2f < r2 < infinity r6/1.1 < r7 < 1.1 r6 r3/1.1 < r9 < 1.1 r3 d6/1.1 < (r6 + r7 )/2 < 1.1 d6 (1 - n2)/r4 + (n3 - 1)/r5 < 0 0.6f < d3 + d4 + d5 + d6 + d7 + d8 < 0.8f where f represents the overall focal length of the lens system, r the radius of curvature of each surface of said components, d the intervertex distance between adjacent surfaces of said components, and n the refractive index of each of said components.
Claim 3
Dependent Claim
111 words
A lens system as defined in claim 1, wherein said components having the following characteristics: f 100.0, Relative aperture F/1.2, Angle of view 46*, Back focus 75.7 r1 +129.845 d1 10.08 nd 1.79631 Nu 40.8 r2 +1490.891 d2 0.19 r3 +55.233 d3 16.09 nd 1.744 Nu d 44.9 r4 +116.279 d4 2.91 r5 +168.605 d5 2.91 nd 1.68893 Nu d 31.1 r6 +35.252 d6 34.50 r7 -35.271 d7 2.13 nd 1.7847 Nu d 26.1 r8 Infinity d8 16.86 nd 1.74443 Nu d 49.4 r9 -55.039 d9 0.19 r10 -348.837 d10 11.82 nd 1.72 Nu d 50.2 r11 -67.248 d11 0.19 r12 +178.566 d12 6.20 nd 1.76684 Nu d 46.6 r13 -503.465
Claim 4
Dependent Claim
111 words
A lens system as defined in claim 1, wherein said components having the following characteristics: f 100.0, Relative aperture F/1.2, Angle of view 46*, Back focus 75.6. r1 +129.845 d1 10.08 nd 1.79631 Nu d 40.8 r2 +1490.891 d2 0.19 r3 +54.264 d3 16.47 nd 1.744 Nu d 44.9 r4 +116.279 d4 2.91 r5 +165.116 d5 2.52 nd 1.68893 Nu d 31.1 r6 +34.302 d6 34.50 r7 -34.941 d7 2.13 nd 1.7847 Nu d 26.1 r8 Infinity d8 17.44 nd 1.74443 Nu d 49.4 r9 -54.457d9 0.19 r10 -387.597 d10 11.82 nd 1.72 Nu d 50.2 r11 -67.248 d11 0.19 r12 +178.566 d12 6.20 nd 1.76684 Nu d 46.6 r13 -617.036
Claim 5
Dependent Claim
110 words
A lens system as defined in claim 1, wherein said components having the following characteristics: f 100.0, Relative aperture F/1.2, Angle of view 46*, Back focus 74.2 r1 +125.969 d1 10.85 nd 1.79631 Nu d 40.8 r2 +968.992 d2 0.19 r3 +56.202 d315.5 nd 1.76684 Nu d 46.6 r4 +115.310 d4 2.91 r5 +155.039 d5 2.91 nd 1.68893 Nu d 31.1 r6 +35.754 d6 34.50r7 -35.601 d7 2.13 nd 1.7552 Nu d 27.5 r8 Infinity d8 16.67 nd 1.77279 Nu d 49.5 r9 -57.171 d9 0.19 r10 -237.500 d10 11.82 nd 1.713 Nu d 52.9 r11 -67.054 d11 0.19 r12 +176.357 d12 6.40 nd 1.76684 Nu d 46.6 r13 -416.759
Claim 6
Dependent Claim
111 words
A lens system as defined in claim 1, wherein said components having the following characteristics: f 100.0, Relative aperture F/1.4, Angle of view 46*, Back focus 74.0 r1 +79.457 d1 7.75 nd 1.76684 Nu d 46.6 r2 +300.388 d2 0.19 r3 +51.395 d3 9.88 ND 1.79631 Nu d 40.8 r4 +77.519 d4 5.81 r5 +84.302 d5 1.55 nd 1.72825 Nu d 28.3 r6 +31.976 d6 31.97 r7 -31.976 d7 1.74 nd 1.74077 Nu d 27.7 r8 -1162.8 d8 14.73 nd 1.77279 Nu d 49.5 r9 -51.977 d9 0.19 r10 -199.612 d10 10.66 nd 1.77279 Nu d 49.5 r11 -61.087 d11 01.9 r12 +251.938d12 5.43 nd 1.79631 Nu d 40.8 r13 -449.946
References Cited (Backward Citations)
US3451745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |