Automatic focussing apparatus

Details Automatic focussing apparatus Automatic focussing apparatus

1983-12-08

1985-12-10

Adams, Russell E.

354286, 354484, G03B 1700, G03B 310

Patent

active

045575797

ABSTRACT:
An automatic focussing apparatus includes an operating switch disposed on a camera which may be closed to energize an in-focus detector circuit from a battery contained within the camera and to energize a motor drive circuit from another battery contained within a lens barrel. The apparatus also includes an operating switch mounted on the lens barrel which may be turned on to energize the in-focus detector circuit and the motor drive circuit from a battery disposed within the lens barrel.Focussing signals representing the magnitude and direction of lens movement from the focussing processor may be coupled to the motor control circuit through two control lines in one embodiment or only one control line in a second embodiment.

REFERENCES:
patent: 4091395 (1978-05-01), Kozuki et al.
patent: 4400075 (1983-08-01), Tomori et al.
patent: 4423935 (1984-01-01), Eguchi et al.

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