Automatic focus detecting apparatus

Details Automatic focus detecting apparatus Automatic focus detecting apparatus

1990-01-09

1991-10-01

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502012, G03B 1336, G02B 728

Patent

active

050538004

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: 4303321 (1981-12-01), Enomoto et al.
patent: 4416523 (1983-11-01), Kawabata
patent: 4792668 (1988-12-01), Akashi et al.

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