US4298265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-intercepting device in a camera
Assignee: Nikon Corp
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Filing: 1980-05-23
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Granted: 1981-11-03
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Expires: 2000-05-23
Abstract
Abstract In a light-intercepting device in a camera including a plurality of flat light-intercepting vanes disposed on a light-intercepting plane crossing an optical path, the light-intercepting vanes comprise a substrate formed of titanium or a titanium alloy, and a hardened layer of titanium compound formed on the surface of the substrate.
Inventors
- 👤 Etsuo Tanaka
- 👤 Hironobu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:09
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
In a light-intercepting device in a camera including a plurality of flat light-intercepting vanes disposed on a light-intercepting plane crossing an optical path, said light-intercepting vanes being driven so as to be parallel-moved relative to each other on said light-intercepting plane to thereby control the quantity of light passed therethrough, the improvement of said light-intercepting vanes comprising: a substrate formed of titanium or a titanium alloy; and a hardened layer of titanium compound formed on the surface of said substrate.
Claim 2
Dependent Claim
80 words
In a light-intercepting device in a camera including a plurality of flat light-intercepting vanes disposed on a light-intercepting plane crossing an optical path, said light-intercepting vanes being driven so as to be parallel-moved relative to each other on said light-intercepting plane to thereby control the quantity of light passed therethrough, the improvement of said light-intercepting vanes comprising: a substrate formed of titanium or a titanium alloy; and a hardened layer of titanium compound formed on the surface of said substrate.
Claim 3
Dependent Claim
15 words
A light-intercepting device according to claim 1, wherein said hardened layer consists of titanium nitride.
Claim 4
Dependent Claim
15 words
A light-intercepting device according to claim 1, wherein said hardened layer consists of titanium boride.
Claim 5
Dependent Claim
101 words
In a light-intercepting device in a camera including a plurality of flat light-intercepting vanes disposed on a light-intercepting plane crossing an optical path, said light-intercepting vanes being driven by a driving device engaged with an engaging portion formed integrally with said light-intercepting vanes, so as to be parallel-moved relative to each other on said light-intercepting plane to thereby control the quantity of light passed therethrough, the improvement of said light-intercepting vanes comprising: a substrate formed of titanium or a titanium alloy; and a hardened layer of titanium compound formed on the surface of said substrate including at least said engaging portion.
Claim 6
Dependent Claim
101 words
In a light-intercepting device in a camera including a plurality of flat light-intercepting vanes disposed on a light-intercepting plane crossing an optical path, said light-intercepting vanes being driven by a driving device engaged with an engaging portion formed integrally with said light-intercepting vanes, so as to be parallel-moved relative to each other on said light-intercepting plane to thereby control the quantity of light passed therethrough, the improvement of said light-intercepting vanes comprising: a substrate formed of titanium or a titanium alloy; and a hardened layer of titanium compound formed on the surface of said substrate including at least said engaging portion.
References Cited (Backward Citations)
US3078776A
Cited
US3903539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |