Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-12-02
1989-01-24
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, 354408, G01J 136
Patent
active
048002615
ABSTRACT:
Light intensity distributions of object images whose relative positions vary with a focusing state of an objective lens are formed by a lens assembly based on light fluxes transmitted through the objective lens, and the distributions are sensed by sensing devices having a plurality of photo-sensors to produce first and second signals for the respective light intensity distributions. The first and second signals are processed by relatively displacing the first and second signals under a first relationship and by relatively displacing the first and second signals under a second relationship different from the first relationship to determine a relative positional relationship of the light intensity distributions. If there is identical or essentially identical portion is found in the processing of the first signal and the second signal, the previous processing result is utilized to shorten the processing time.
REFERENCES:
patent: 4394569 (1983-07-01), Nakamura
patent: 4540881 (1985-09-01), Hayashi et al.
patent: 4573784 (1986-03-01), Suzuki
Canon Kabushiki Kaisha
Shami Khaled
Westin Edward P.
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