Patent US3743387A successfully refreshed from Google Patents.
US3743387A
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US
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Large aperture six component photographic lens
Assignee: Olympus Corp
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Filing: 1971-11-05
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Granted: 1973-07-03
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Expires: 1991-11-05
Abstract
Abstract Large aperture photographic lens of the modified Gauss type consisting of seven lens elements which form six lens groups. The fourth lens group from the object side consists of two lens elements cemented to each other forming a concave meniscus as a whole with the concave side directed to the object, and the absolute value of the radius of curvature of the cemented surfaces is smaller than the value three times the focal length of the photographic lens while the cemented surfaces are concave toward the object, so that the thickness of the fourth lens group is made small thereby permitting the total length of the photographic lens to be made small to increase the light quantity in the marginal zone.
Inventors
- 👤 J Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:14
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
316 words
In a large aperture photographic lens consisting of seven lens elements which form six lens groups, the improvement wherein the first and the second lens groups beginning at the object side are each made of a convex meniscus with the convex side thereof being directed to the object side, and the third lens group is a concave meniscus with its convex side being directed to the object side, the fourth lens group being made of two lens elements cemented to each other forming a concave meniscus as a whole with the concave side thereof being directed to the object side, the fifth lens group being a convex meniscus with its concave side being directed to the object side, while the sixth lens group being a convexo-convex lens element, said lens elements satisfying the following numerical data: r1 0.7165 r2 2.5138 r3 0.4702 r4 0.7194 r5 0.8663 r6 0.2957 r7 -0.3267 r8 -1.7781 r9 -0.5193 r10 -1.8394 r11 -0.5741 r12 1.4655 r13 -16.6768 d1 0.1103 d2 0.0021 d3 0.0890 d4 0.0347 d5 0.0320 d6 0.3413 d7 0.0320 d8 0.1388 d9 0.0018 d10 0.1014 d11 0.0021 d12 0.0633 n1 1.8030 n2 1.8061 n3 1.7618 n4 1.7283 n5 1.7550 n6 1.7130 n7 1.7130 Nu 1 46.6 Nu 2 40.8 Nu 3 27.1 Nu 4 28.5 Nu 5 52.4 Nu 6 53.9 Nu 7 53.9 where: ri (i 1 - 13) the radius of curvature of each of the refracting surfaces of the lens elements, i beginning at the object side di (i 1 - 12) the thickness of each of the lens elements and the air gap between the adjacent lens elements, i beginning at the object side ni (i 1 - 7) the refractive index of each of the lens elements, i beginning at the object side Nu i (i 1 - 7) the Abbe number of each of the lens elements, i beginning at the object side.
Claim 2
Dependent Claim
316 words
In a large aperture photographic lens consisting of seven lens elements which form six lens groups, the improvement wherein the first and the second lens groups beginning at the object side are each made of a convex meniscus with the convex side thereof being directed to the object side, and the third lens group is a concave meniscus with its convex side being directed to the object side, the fourth lens group being made of two lens elements cemented to each other forming a concave meniscus as a whole with the concave side thereof being directed to the object side, the fifth lens group being a convex meniscus with its concave side being directed to the object side, while the sixth lens group being a convexo-convex lens element, said lens elements satisfying the following numerical data: r1 0.7165 r2 2.5138 r3 0.4702 r4 0.7194 r5 0.8663 r6 0.2957 r7 -0.3267 r8 -1.7781 r9 -0.5193 r10 -1.8394 r11 -0.5741 r12 1.4655 r13 -16.6768 d1 0.1103 d2 0.0021 d3 0.0890 d4 0.0347 d5 0.0320 d6 0.3413 d7 0.0320 d8 0.1388 d9 0.0018 d10 0.1014 d11 0.0021 d12 0.0633 n1 1.8030 n2 1.8061 n3 1.7618 n4 1.7283 n5 1.7550 n6 1.7130 n7 1.7130 Nu 1 46.6 Nu 2 40.8 Nu 3 27.1 Nu 4 28.5 Nu 5 52.4 Nu 6 53.9 Nu 7 53.9 where: ri (i 1 - 13) the radius of curvature of each of the refracting surfaces of the lens elements, i beginning at the object side di (i 1 - 12) the thickness of each of the lens elements and the air gap between the adjacent lens elements, i beginning at the object side ni (i 1 - 7) the refractive index of each of the lens elements, i beginning at the object side Nu i (i 1 - 7) the Abbe number of each of the lens elements, i beginning at the object side.
References Cited (Backward Citations)
GB1120335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |