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US 4,643,557 AGranted
Exposure control apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAkira Ishizaki, Akira Akashi, Keiji Ohtaka, Yasuo Suda, Akira Hiramatsu
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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.
Claims5
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.
4 more elements
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.
2 more elements
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.
2 more elements
Dependencies are inferred from the claim text.