Automatic focus detecting apparatus

Details Automatic focus detecting apparatus Automatic focus detecting apparatus

1989-01-23

1990-06-19

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354403, 2502012, G03B 310, G01J 120

Patent

active

049357654

ABSTRACT:
An improved focus detecting apparatus comprises a photographic lens, a focus detecting device for detecting the focusing condition of the photographic lens and a lens driving means for driving the photographic lens based on the focusing condition detected, and the photographic lens is driven, in advance, to a focusing position where a frequently used magnification rate determined in accordance with the focal length of said photographic lens is attained, and then driven to an in-focus position.

REFERENCES:
patent: 4265528 (1981-05-01), Bestenreiner et al.
patent: 4521093 (1985-06-01), Kawabata et al.
patent: 4743931 (1988-05-01), Matsuzaki et al.

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