Lens driving apparatus for a camera

Details Lens driving apparatus for a camera Lens driving apparatus for a camera

1989-11-03

1990-11-20

Gellner, Michael L.

G03B 310

Patent

active

049722158

ABSTRACT:
A lens driving apparatus for use in a camera, which adjusts the focus or the angle of view of a lens by means of a motor driven in accordance with the amount of rotation and the rotational angle of a rotational operation member provided on a lens body or a camera body, comprises a first detector for detecting the operational direction and the amount of operation of the rotational operation member and generates an operational direction signal and an amount-of-operation pulse signal, a second detector for detecting the actual amount of driving of the lens and generating a drive pulse signal, a motor driver for rotating the motor in a direction according to the operational direction signal until the difference between the count value of an amount-of-operation pulse and an amount-of-driving pulse becomes O, and a velocity controller for setting a high speed to the motor driver when the above difference is large and setting a low speed to the motor drive when the difference is small.

REFERENCES:
patent: 4743931 (1988-05-01), Matsuzaki et al.

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