US3877795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small retrofocus type super wide-angle objective lens system
Assignee: Olympus Corp
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Filing: 1973-05-01
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Granted: 1975-04-15
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Expires: 1993-05-01
Abstract
Abstract A small retrofocus type super wide-angle objective lens system having an aperture ratio of 1:3.5 and a picture angle up to 100*, with a front divergent lens group A and a rear convergent lens group B, said front divergent lens group A consisting of front and rear lens groups A1 and A2, said front lens group A1 consisting of a positive meniscus first component L1 that has its object side a convex surface and two negative meniscus second and third components L2 and L3, said rear lens group A2 consisting of a positive lens fourth component L4 and a negative meniscus fifth component L5, and said rear convergent lens group B consisting of two positive lens sixth and seventh components L6 and L7, a negative lens eighth component L8, and two positive lens ninth and tenth components L9 and L10, and which is defined by the following three conditions, i.e.
Inventors
- 👤 Nobuo Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:05
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
A small retrofocus type super wide-angle objective lens system with a front divergent lens group A and a rear convergent lens group B, said front divergent lens group A consisting of front and rear lens groups A1 and A2, said front lens group A1 consisting of a positive meniscus first component L1 that has its object side a convex surface and two negative meniscus second and third components L2 and L3 that have their object sides convex surfaces; respectively, said rear lens group A2 consisting of a positive lens fourth component L4 that has its object side a convex surface, and a negative meniscus fifth component L5 that has its object side a convex surface, and said rear convergent lens group B consisting of a biconvex positive lens sixth component L6 that has its object side a convex surface having a larger curvature, a positive biconvex seventh component L7 that has its object side a convex surface having a smaller curvature, a negative lens eight component L8, and two positive meniscus lens ninth and tenth components L9 and L10 that have their image sides convex surfaces, respectively, and which is defined by the following three conditions, i.e.,
Claim 2
Dependent Claim
197 words
A small retrofocus type super wide-angle objective lens system with a front divergent lens group A and a rear convergent lens group B, said front divergent lens group A consisting of front and rear lens groups A1 and A2, said front lens group A1 consisting of a positive meniscus first component L1 that has its object side a convex surface and two negative meniscus second and third components L2 and L3 that have their object sides convex surfaces; respectively, said rear lens group A2 consisting of a positive lens fourth component L4 that has its object side a convex surface, and a negative meniscus fifth component L5 that has its object side a convex surface, and said rear convergent lens group B consisting of a biconvex positive lens sixth component L6 that has its object side a convex surface having a larger curvature, a positive biconvex seventh component L7 that has its object side a convex surface having a smaller curvature, a negative lens eight component L8, and two positive meniscus lens ninth and tenth components L9 and L10 that have their image sides convex surfaces, respectively, and which is defined by the following three conditions, i.e.,
Claim 3
Dependent Claim
46 words
A small retrofocus type super wide-angle objective lens system as claimed in claim 1, wherein said sixth and seventh components L6 and L7 are arranged face to face with a diaphragm therebetween and the ratio of the refractive powers of said two components is defined by
Claim 4
Dependent Claim
41 words
A small retrofocus type super wide-angle objective lens system as claimed in claim 1, wherein the seventh and eight components L7 and L8 are positioned on the object side for focusing the lens system to the short distance with d13+d18 constant.
Claim 5
Dependent Claim
44 words
A small retrofocus type super wide-angle objective lens system as claimed in claim 1, wherein f 100 mm and 2 omega 100* and r1 to r22, d1 to d21, n1 to n12 and upsilon 1 to upsilon 12 are defined by the following values:
Claim 6
Dependent Claim
44 words
A small retrofocus type super wide-angle objective lens system as claimed in claim 1, wherein f 100 mm and 2 omega 100* and r1 and r22, d1 to d21, n1 to n12 and upsilon 1 to upsilon 12 are given by the following values:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |