Autofocusing apparatus utilizing intermittent light projection

Details Autofocusing apparatus utilizing intermittent light projection Autofocusing apparatus utilizing intermittent light projection

1991-11-12

1992-08-11

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 2502014, G03B 318

Patent

active

051383586

ABSTRACT:
An autofocus apparatus for use with a light projection device which projects light to an object, and a storage sensor which alternately receives light reflected from the object when the light is projected onto the object and when the light is not projected onto the object includes an extraction circuit for extracting from the storage sensor (1) a first sensor output corresponding to when the light is projected onto the object, and (2) a second sensor output corresponding to when the light is not projected onto the object. A setting circuit is provided for setting the sensor in an initial state every time the extraction circuit extracts an output signal from the storage sensor. A control circuit is provided for calculating a difference between the first and second sensor signals and providing an output signal corresponding to the difference.

REFERENCES:
patent: 4678323 (1987-07-01), Sati et al.
patent: 4681432 (1987-07-01), Kawabata et al.
patent: 4701626 (1987-10-01), Ishizaki et al.
patent: 4835561 (1989-05-01), Matsui

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