Lens driving device

Details Lens driving device Lens driving device

1989-05-02

1990-03-13

Hix, L. T.

3541951, E03B 310

Patent

active

049086472

ABSTRACT:
A lens driving device is for driving a focusing lens to stop the focusing lens at a desired position. The device comprises means including a driving mechanism having a backlash, for driving the focusing lens along the optical axis thereof; means for detecting a moving direction of the focusing lens; means for storing a reference position of the focusing lens; means for storing a moving direction of the focusing lens immediately before the focusing lens is stopped at the reference position; means for comparing a present moving direction according to the moving direction detecting means with the stored moving direction; and means for controlling the driving means so that the focusing lens moves through the desired position by a predetermined amount not less than the amount of the backlash, and the focusing lens reversely moves by the predetermined amount when said comparing means detects the present moving direction is different from the stored moving direction.

REFERENCES:
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4783676 (1988-11-01), Aihara et al.

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