Patent US3846807A successfully refreshed from Google Patents.
US3846807A
Expired / Lapsed
US
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Automatic exposure control device for photographic cameras
Assignee: Fujifilm Holdings Corp
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Filing: 1974-02-14
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Granted: 1974-11-05
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Expires: 1994-02-14
Abstract
Abstract An automatic exposure control device for a camera for controlling a diaphragm in accordance with the illumination of an object to be photographed comprising a photoreceptor which receives light from the object and generates an output current in proportion to the amount of light received, at least one movable diaphragm control blade moved in accordance with the output current from the photoreceptor for controlling the aperture size, and light intercepting means associated with the diaphragm control blade for reducing the amount of light received by the photoreceptor when the blade approaches the fully opened aperture position.
Inventors
- 👤 J Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:06
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
An automatic exposure control device for a camera for controlling a diaphragm in accordance with the illumination of an object to be photographed comprising a photoreceptor which receives light from said object and generates an output current in proportion to the amount of light received, at least one movable diaphragm control blade moved in accordance with the output current from said photoreceptor for controlling the aperture size, and light intercepting means associated with said diaphragm control blade for reducing the amount of light received by said photoreceptor when said blade approaches the fully opened aperture position.
Claim 2
Dependent Claim
96 words
An automatic exposure control device for a camera for controlling a diaphragm in accordance with the illumination of an object to be photographed comprising a photoreceptor which receives light from said object and generates an output current in proportion to the amount of light received, at least one movable diaphragm control blade moved in accordance with the output current from said photoreceptor for controlling the aperture size, and light intercepting means associated with said diaphragm control blade for reducing the amount of light received by said photoreceptor when said blade approaches the fully opened aperture position.
Claim 3
Dependent Claim
28 words
The automatic exposure control device for a camera as defined in claim 1, wherein said light intercepting means is a light intercepting portion integrally connected with said blade.
Claim 4
Dependent Claim
22 words
The automatic exposure control device for a camera as defined in claim 2, wherein said light intercepting portion is an opaque material.
Claim 5
Dependent Claim
22 words
The automatic exposure control device for a camera as defined in claim 2, wherein said light intercepting portion is a semi-transparent material.
Claim 6
Dependent Claim
31 words
The automatic exposure control device for a camera as defined in claim 1, wherein said light intercepting portion is a member associated with said diaphragm blade and moved in association therewith.
Claim 7
Dependent Claim
22 words
The automatic exposure control device for a camera as defined in claim 5, wherein said light intercepting portion is an opaque material.
Claim 8
Dependent Claim
22 words
The automatic exposure control device for a camera as defined in claim 5, wherein said light intercepting portion is a semi-transparent material.
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 |