Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1996-07-05
1997-12-16
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502014, 396 79, G01J 120
Patent
active
056988419
ABSTRACT:
An optical apparatus provided with a light receiving device for receiving light distributions from light beams passed through different portions of a pupil of a main imaging lens, a focus state detecting device for detecting the focus state of the main imaging lens from the positional relation between the light distributions received by the light receiving device, a decentration position detecting device for detecting the decentration position of a decenterable lens provided in the main imaging lens, a memory for memorizing inherent data of the main imaging lens which should correct the focus state detection output at each decentration position, and a calculating device for calculating the amount of movement of a focusing lens for focusing by the use of the inherent data read out from the memory conforming to a signal from the decentration position detecting device and the focus state detection output.
REFERENCES:
patent: 4473287 (1984-09-01), Fukuhara et al.
patent: 4812868 (1989-03-01), Utagawa et al.
patent: 4864339 (1989-09-01), Gross et al.
patent: 4912493 (1990-03-01), Tanaka
patent: 5069537 (1991-12-01), Kitagishi
patent: 5276318 (1994-01-01), Hirasawa
Canon Kabushiki Kaisha
Le Que
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