Focus state detection device

Details Focus state detection device Focus state detection device

1991-06-04

1994-03-08

McGraw, Vincent P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01J 120

Patent

active

052930343

ABSTRACT:
A focus state detection device comprising: a first optical conversional system for forming an optical flux in one of two symmetric regions with respect to an optical axis of an optical flux from a subject to be photographed; a second optical conversional system for forming an optical flux in the other of the two symmetric regions; and a third optical conversional system for forming an optical flux in a region including the optical axis. The device further comprises a first and a second photoelectric converters for generating electric signals in response to optical intensity distribution data of the fluxes formed by the first and second systems, respedtively; a third photoelectric converter for generating an electric signal in response to optical intensity distribution data of the flux formed by the third system; and a calculation unit for detecting a focus state of the subject on the basis of correlation between three electric signals output from the first, second and third converter means.

REFERENCES:
patent: 4988856 (1991-01-01), Hamada et al.

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