PURPOSE: To move and stop a lens unit to/on prescribed positions respectively even if the lens unit has the dispersion of moving distances among respective lenses by forming a stroke absorbing member in a driving force transmission system from a driving member to a lens unit.
CONSTITUTION: Although a driving pin 11 applies torque to a crank arm 9 in the clockwise direction, a crank arm 9 can not be rotated because a crank lever 7 is united with a lens unit 1 by the elastic function of a twisted spring 8, so that the driving pin 11 moves the lens unit 1 through a crank shaft 6 from a prescribed end position in parallel in the arrow A direction. When said operation is continued, a large gear 13 reaches near a half of revolution and the lens unit 1 is moved and stopped to/on the other end position, larger driving force is applied to the driving pin 11 and the crank lever 7 is rotated against the elastic function of the twisted spring 8. In accordance with said operation, the driving pin 11 ends the operation of the whole strokes so as to be turned to the succeeding restoring operation.
ITO EIJI
MIYAMA KENJI
SAWAMURA MASATAKA
