US3846805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control circuit structure
Assignee: Canon Inc
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Filing: 1974-01-23
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Granted: 1974-11-05
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Expires: 1994-01-23
Abstract
Abstract In a camera having a TTL metering system, an exposure control circuit structure includes a flexible substrate, an electric circuit printed on the substrate and at least one light-receiving element provided on the substrate and connected to the circuit. The circuit structure may be bent along an optical element of the camera.
Inventors
- 👤 T Kiyohara
- 👤 T Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:21
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B7/00; G03B7/08; G03B7/081; G03B7/089; H; H05; H05K; H05K1/00; H05K1/18; H05K1/189
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
An exposure control circuit structure for a photographic camera comprising a flexible print substrate, an electric circuit printed on said substrate, and at least one photoelectric element provided on said substrate and connected to said electric circuit, said print substrate being disposed on and along nonfunctional faces of an optical element in the viewfinder''s optical system of the camera.
Claim 2
Dependent Claim
59 words
An exposure control circuit structure for a photographic camera comprising a flexible print substrate, an electric circuit printed on said substrate, and at least one photoelectric element provided on said substrate and connected to said electric circuit, said print substrate being disposed on and along nonfunctional faces of an optical element in the viewfinder''s optical system of the camera.
Claim 3
Dependent Claim
15 words
A circuit structure according to claim 1, further comprising an integrated circuit and adjusting resistors.
Claim 4
Dependent Claim
11 words
A circuit structure according to claim 1, further comprising a Capacitor.
Claim 5
Dependent Claim
29 words
A circuit structure according to claim 1, wherein said optical element is a pentaprism and said circuit structure is bent along and disposed on the roof of said pentaprism.
Claim 6
Dependent Claim
21 words
A circuit structure according to claim 1, wherein said photoelectric element is disposed adjacent to the viewfinder''s eyepiece of the camera.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |