Backlash removing device for stowed lens barrel

Details Backlash removing device for stowed lens barrel Backlash removing device for stowed lens barrel

1994-12-06

1996-08-06

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359696, 359694, 359700, 359699, 35419512, G02B 1514, G03B 118

Patent

active

055439713

ABSTRACT:
A backlash removing device for a lens barrel, including a plurality of lens groups movable in an optical axis direction and cylindrical members movable in the optical axis direction by a motor for moving the plurality of lens groups. A motion converting mechanism having a rotation member for converting rotation of the motor to movement of the plurality of lens groups through the cylindrical members so as to move the plurality of lens groups between an extended position and a stowed position is provided. A lens position detecting mechanism directly detects positions of the rotation member for indirectly detecting positions of the plurality of lens groups and a control mechanism drives the motor to move the lens groups between the extended position and the stowed position. The control mechanism changes a rotational direction of the motor from a forward direction to a reverse direction after the lens position detecting mechanism detects that the rotation member reaches the stowed position of the rotation member when the cylinder members move the lens groups to the stowed position from the extended position, and then stops the motor after a rotational amount of the motor in the reverse direction reaches a predetermined amount.

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