Lens driving device

Details Lens driving device Lens driving device

1994-09-13

1996-02-20

Gellner, Michael L.

3541951, G03B 118

Patent

active

054933579

ABSTRACT:
A camera lens driving device of the present invention drives the lens at a constant speed while pressing force applied to an operating member by the operator is below a predetermined value and controls the lens driving speed according to pressing force after it exceeds the predetermined value. The lens driving device comprises a photo-taking lens, an actuator for driving the lens, an operating member for specifying a direction in which the lens is to be driven, a pressing force detector for detecting pressing force applied to the operating member to produce a variable output, and a drive controller responsive to an output of the pressing force detector for outputting a drive signal to the actuator. The drive controller includes first and second comparators and a drive signal output circuit. In response to the operating member being pressed the pressing force detector outputs a drive control signal to the drive controller. When pressing force to the operating member lies within the range from a first to a second predetermined value, the drive controller drives the lens at a low constant speed through the actuator. When the pressing force is increased to exceed the second predetermined value, the drive controller changes the driving speed of the lens according to the pressing force applied to the operating member.

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patent: 5241335 (1993-08-01), McIntyre

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