In-focus state detection device

Details In-focus state detection device In-focus state detection device

1984-07-13

1985-12-31

Perkey, William B.

G03B 310

Patent

active

045617503

ABSTRACT:
In an in-focus state detection device for determining a defocus quantity of an object lens based on a relative positional relationship of a plurality of object images, a contrast of at least one of the object images is detected before the relative positional relationship of the object images is detected, and the relative positional relationship of the object images is detected only when the contrast is larger than a predetermined level so that a determination precision and a response speed of the device are improved.

REFERENCES:
patent: 4220850 (1980-09-01), McEachern
patent: 4305657 (1981-12-01), Masunaga et al.

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