Patent US4643557A successfully refreshed from Google Patents.
US4643557A
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Exposure control apparatus
Assignee: Canon Inc
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Filing: 1985-09-23
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Granted: 1987-02-17
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Expires: 2005-09-23
Abstract
Abstract This is disclosed an exposure control device capable of controlling an exposure by using a CCD etc. sensor in which CCD sensor is also used for detecting a focus state of an imaging lens of camera or the like.
Inventors
- 👤 Akira Ishizaki
- 👤 Akira Akashi
- 👤 Keiji Ohtaka
- 👤 Yasuo Suda
- 👤 Akira Hiramatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/091; G02; G02B; G02B7/00; G02B7/28; G02B7/34; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09972
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
An exposure control apparatus comprising: a signal storage type sensor having a plurality of pixels; first means for producing a signal representing a maximum one of pixel information detected by said sensor; second means for producing a signal representing a sum of the pixel information detected by said sensor; third means for producing a signal representing a storage time of said sensor; and calculation means for multiplying the output of said second means with the output of said third means and dividing the product by the output of said first means, whereby the exposure is controlled based on the quotient.
Claim 2
Dependent Claim
100 words
An exposure control apparatus comprising: a signal storage type sensor having a plurality of pixels; first means for producing a signal representing a maximum one of pixel information detected by said sensor; second means for producing a signal representing a sum of the pixel information detected by said sensor; third means for producing a signal representing a storage time of said sensor; and calculation means for multiplying the output of said second means with the output of said third means and dividing the product by the output of said first means, whereby the exposure is controlled based on the quotient.
Claim 3
Dependent Claim
20 words
An exposure control apparatus according to claim 1 wherein said first, second and third means are portions of a microcomputer.
Claim 4
Dependent Claim
19 words
An exposure control apparatus according to claim 1 wherein said sensor receives images of an object having a parallax.
Claim 5
Dependent Claim
87 words
A camera having a focus detection device for an object lens, comprising: optical means for forming a plurality of secondary images from an image of the object formed by the object lens; a signal storage type sensor having a plurality of pixels for sensing the secondary images, exposure control means for controlling exposure of the camera; and means for determining a control value to said exposure control means in accordance with a sum of information of said plurality of pixels and a storage time of said sensor.
Claim 6
Dependent Claim
87 words
A camera having a focus detection device for an object lens, comprising: optical means for forming a plurality of secondary images from an image of the object formed by the object lens; a signal storage type sensor having a plurality of pixels for sensing the secondary images, exposure control means for controlling exposure of the camera; and means for determining a control value to said exposure control means in accordance with a sum of information of said plurality of pixels and a storage time of said sensor.
Claim 7
Independent Claim
114 words
A method for controlling exposure in accordance with a signal storage type sensor having a plurality of pixels, comprising: a first step for producing a signal representing a maximum one of pixel information sensed by the sensor; a second step for producing a signal representing a sum of the pixel information sensed by the sensor; a third step for producing a signal representing a storage time of the sensor; and a fourth step for multiplying the output of said second means with the output of said third means and dividing the product by the output of said first means, whereby the exposure is controlled in accordance with a quotient obtained in the fourth step.
Claim 8
Independent Claim
114 words
A method for controlling exposure in accordance with a signal storage type sensor having a plurality of pixels, comprising: a first step for producing a signal representing a maximum one of pixel information sensed by the sensor; a second step for producing a signal representing a sum of the pixel information sensed by the sensor; a third step for producing a signal representing a storage time of the sensor; and a fourth step for multiplying the output of said second means with the output of said third means and dividing the product by the output of said first means, whereby the exposure is controlled in accordance with a quotient obtained in the fourth step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |