Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1984-03-30
1987-02-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250205, 354403, G01J 120, G01J 132
Patent
active
046424512
ABSTRACT:
In the disclosed distance measuring device a light source projects light on an object to be photographed. A photo-electric converter for receiving light reflected from the object includes at least one photo-electric converting portion whose electric charge varies according to the quantity of light incident thereon. A control includes a first electric charge store which stores an electric charge produced at the photo-electric converting portion while the light is projected from the light source, a second electric charge store which stores an electric charge produced at the photo-electric converting portion while light is not projected from the light source, and a detector which detects at least one of the amounts of electric charge stored at the first and second electric charge stores. The control varies the quantity of light projected by the light source on the basis of the result detected by the detector.
REFERENCES:
patent: 4274735 (1981-06-01), Tamura et al.
patent: 4315159 (1982-02-01), Niwa et al.
patent: 4368978 (1983-01-01), Tsunekawa et al.
patent: 4477168 (1984-10-01), Hosoe
patent: 4521106 (1985-06-01), Lambeth
patent: 4522492 (1985-06-01), Masunaga
Kawabata Takashi
Matsumura Susumu
Sato Yuichi
Tsunekawa Tokuichi
Canon Kabushiki Kaisha
Messinger Michael
Nelms David C.
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