Digital control system for automatic-focus cameras

Details Digital control system for automatic-focus cameras Digital control system for automatic-focus cameras

1980-07-03

1982-02-02

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318603, 318640, G05B 501

Patent

active

043141870

ABSTRACT:
A digital control circuit for use in automatic-focus cameras is disclosed, which is suitable for use in self-focusing systems which determine focus by means of triangulation. The system corrects for motor oscillation about a state of proper focus, defocusing caused by inertia, and for an inability to evaluate proper state of focus caused by large distances between the camera and a subject.

REFERENCES:
patent: 3890550 (1975-06-01), Izumi et al.
patent: 3949287 (1975-04-01), Wagensonner
patent: 4128794 (1978-12-01), Burleson
patent: 4239354 (1980-12-01), Shenk
patent: 4264850 (1981-04-01), Cannon et al.

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