RACK AND OPTICAL APPARATUS HAVING THE SAME

摘要

A rack includes a first member including a main tooth, a second member including an opposite tooth disposed opposite the main tooth, the second member being rotatable with respect to the first member, a first forcing unit configured to force the main tooth, and a second forcing unit configured to force the main tooth and the opposite tooth closer to each other. On a plane perpendicular to a central axis of a lead screw, each of a part at which the first forcing unit forces the first member, a part at which the second forcing unit forces the first member, and a part at which the second forcing unit forces the second member is disposed on a movable member side with respect to a straight line connecting a rotating axis of the second member and the central axis.

主权项

1. A rack mounted to a movable member and configured to transfer a driving power of a driver to the movable member, the rack comprising:
a first member including a main tooth to be engaged with a lead screw rotated by the driver; a second member including an opposite tooth disposed opposite the main tooth with respect to the lead screw and engageable with the lead screw, the second member being rotatable with respect to the first member; a first forcing unit configured to force the main tooth against the lead screw; and a second forcing unit configured to force the main tooth and the opposite tooth closer to each other, wherein on a plane perpendicular to the central axis of the lead screw, each of a part at which the first forcing unit forces the first member, a part at which the second forcing unit forces the first member, and a part at which the second forcing unit forces the second member is disposed on a movable member side with respect to a straight line connecting a rotating axis of the second member and the central axis of the lead screw.