Automatic focusing device for camera

Details Automatic focusing device for camera Automatic focusing device for camera

1987-12-31

1990-01-16

Perkey, W. B.

G03B 310

Patent

active

048946761

ABSTRACT:
An automatic focusing device for driving a lens to the in-focus position by a motor, by driving the motor at a high speed when the lens is distanced from the in-focus position by a large amount, or at a low speed when the lens is distance from the in-focus position by a small amount. Even when the lens is distanced from the in-focus position by a large amount, the high-speed drive is not conducted if the motor has to be switched to the low speed in the course of acceleration to the high speed, in order to prevent strong shock to the user, encountered in case of such sudden change to the low speed drive.

REFERENCES:
patent: 4451729 (1984-05-01), Takagi et al.
patent: 4469417 (1984-09-01), Masunaga et al.
patent: 4623238 (1986-11-01), Taniguchi et al.
patent: 4745425 (1988-05-01), Kusaka
patent: 4777504 (1988-10-01), Akada et al.

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