Patent US3926507A successfully refreshed from Google Patents.
US3926507A
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Telephoto lens system
Assignee: Olympus Corp
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Filing: 1975-01-30
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Granted: 1975-12-16
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Expires: 1995-01-30
Abstract
Abstract A telephoto lens system designed to operate with an image angle on the order of 24* at an aperture ratio F:4.5 and having a telephoto ratio as small as 0.92 and a high degree of correction of various aberrations is disclosed. The telephoto lens system consists of five single air-spaced lenses which are optically aligned with each other in succession from the object side and convex toward the object side, respectively. The first three lenses are positive meniscus lenses, respectively. The fourth lens is a negative meniscus lens and the fifth lens is a positive meniscus lens which is lengthily air-spaced from the fourth lens.
Inventors
- 👤 Jihei Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:58
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A telephoto lens system which consists of five single airspaced lenses which are optically aligned with each other in succession from the object side and convex toward the object side, respectively, the first three lenses being positive meniscus lenses, respectively, the fourth lens being a negative meniscus lens and the fifth lens being a positive meniscus lens which is lengthily air-spaced from said fourth lens, and constructed according to the constructional data given herebelow: f 100, F:4.5
Claim 2
Dependent Claim
77 words
A telephoto lens system which consists of five single airspaced lenses which are optically aligned with each other in succession from the object side and convex toward the object side, respectively, the first three lenses being positive meniscus lenses, respectively, the fourth lens being a negative meniscus lens and the fifth lens being a positive meniscus lens which is lengthily air-spaced from said fourth lens, and constructed according to the constructional data given herebelow: f 100, F:4.5
References Cited (Backward Citations)
US3749478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |