| 摘要 |
PROBLEM TO BE SOLVED: To reduce the problem that a stopper which stops a rotating movable body may be dropped off by an action of a force which is generated when the movable body is stopped.SOLUTION: When a rotary gear 716 is rotated, a sub liquid crystal unit 730 is rotated around a predetermined axis of rotation (Z axis in a longitudinal direction). A stopper 900 is movable towards the rotary gear 716. After the rotation of the rotary gear 716 is started, the stopper 900 is made movable (B), a first projection 910 of the stopper 900 and a rear end of the rotary gear 716 in a rotation direction of a first rotation restriction groove m1 are brought into contact at a position that is rotated from an original position at 90 degrees, and the rotation of the rotary gear 716 is stopped (C). In accordance with shapes of first and second rotation restriction grooves m1 and m2 of the rotary gear 716 and first and second projections 910 and 920 of the stopper 900, even in both clock-wise and counter-clock-wise directions, the stopper 900 can be prevented from being dropped out of the rotary gear 716 in a direction of a force that acts on the stopper 900 during the contact.SELECTED DRAWING: Figure 12 |
