Fitzpatrick, Cella, Harper & Scinto
Device for detecting the focus adjusted state of an objecting lens
 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. 
Canon Kabushiki Kaisha
G
G02B
inventional
Yasuo Kazuhiko Takeshi Ichiro Keiji
Suda Arakawa Koyama Ohnuki Ohtaka