Infinite-distance detecting circuit for an auto-focus system

Details Infinite-distance detecting circuit for an auto-focus system Infinite-distance detecting circuit for an auto-focus system

1994-01-11

1996-01-30

Perkey, W. B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting, per se, of an ac input to corresponding dc at an...

327 72, G03B 1336

Patent

active

054884497

ABSTRACT:
An infinite-distance detecting circuit for use in an auto-focusing system in a camera including an amplifier section for amplifying a position detection signal, a reference signal generation section sampling the position detection signal, holding the sample as a reference signal level, and amplifying the reference signal level in accordance with a variable gain in order to generate the infinite-distance-determining reference signal, and a comparator comparing the infinite-distance-determining reference signal to the amplified position detection signal in order to detect an infinite focus distance.

REFERENCES:
patent: 4616264 (1986-10-01), Pshtissky
patent: 4897857 (1990-01-01), Wakatsuki et al.

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