Patent
1989-06-30
1990-09-25
Adams, Russell E.
354406, G03B 1336
Patent
active
049596772
ABSTRACT:
In a focus detecting device has a plurality of optical systems each forming a pair of light distributions whose relative position varies in conformity with the focus adjusted state of an objective lens. The optical systems are disposed so that the direction in which the relative position of the light distributions is varied differs. Focus detecting sensors are provided for receiving the relative position of the light distributions, an the optical systems are constructed so that the optical spacing between the centers of gravity of the areas in which light beams passed through one of the optical systems differs from the optical spacing between the centers of gravity of the areas on another of the optical systems.
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Arakawa Kazuhiko
Koyama Takeshi
Ohnuki Ichiro
Ohtaka Keiji
Suda Yasuo
Adams Russell E.
Canon Kabushiki Kaisha
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