Control device for automatic focusing

Details Control device for automatic focusing Control device for automatic focusing

1986-02-19

1987-01-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, 354405, 354408, G01J 120, G03B 310

Patent

active

046348514

ABSTRACT:
A control device for automatic focusing includes a low sharpness discriminating circuit for identifying a minimum contrast required for focus detecting function and a correlation zone discriminating circuit for determining whether an object is in or out of a correlation zone in the vicinity of the in-focus position. Output signals are supplied from the two discriminating circuits to a sequence control circuit for determining whether to continue or discontinue operation of a lens driving apparatus for driving the lens. A control device may further include a low brightness discriminating circuit the output signal of which is supplied to the sequence control circuit to immediately discontinue the operation of the lens driving apparatus when the low brightness discriminating circuit identifies a low brightness of the object, regardless of the results of other discriminations.

REFERENCES:
patent: 4085320 (1978-04-01), Wilwerding
patent: 4156563 (1979-05-01), Kato et al.
patent: 4247762 (1981-01-01), Wilwerding
patent: 4467187 (1984-08-01), Tsunekawa et al.

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