Automatic focusing device

Details Automatic focusing device Automatic focusing device

1983-06-13

1984-12-18

Perkey, William B.

G03B 708

Patent

active

044887981

ABSTRACT:
Disclosed herein is an automatic focusing device of a camera for use with an exchangeable zoom lens which includes an objective adjustable for both focusing and zooming and a signal generator for generating a focal length signal. The automatic focus control device comprises a focus detector for generating a focus detecting signal .DELTA.L representing the amount of and the direction of the deviation (defocusing) of an image relative to a predetermined film plane, a motor driven for focus adjustment of the objective, and an operation circuit for determining the amount of and the direction of the driving of the motor in accordance with the focus detection signal and the focal length signal.

REFERENCES:
patent: 4157217 (1979-06-01), Isono
patent: 4160904 (1979-07-01), Wilwerding
patent: 4182563 (1980-01-01), Biber et al.
patent: 4305657 (1981-12-01), Masunaga et al.
patent: 4344679 (1982-08-01), Yagi et al.
patent: 4423935 (1984-01-01), Eguchi et al.

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