Abstract: At the time of crimping and fixing a plastic lens on a lens barrel, productivity is improved by achieving an accurate alignment and a reliable crimping. Fixed protrusions are arranged on an outer peripheral portion of the lens at intervals capable of providing three-point support, and a fixed protrusion is arranged on a line connecting the fixed protrusion and the center of the lens, a reference hole corresponding to one of the fixed protrusions includes an opening having substantially the same size as that fixed protrusion, and the other fixed protrusions have substantially the same size and fit in loosely fitting holes. The loosely fitting holes corresponding to the fixed protrusions include larger openings than the fixed protrusions and an elongated hole corresponding to another fixed protrusion is provided in such a manner as to be elongated along a direction of the reference hole.

Abstract: At the time of crimping and fixing a plastic lens on a lens barrel, productivity is improved by achieving an accurate alignment and a reliable crimping. Fixed protrusions are arranged on an outer peripheral portion of the lens at intervals capable of providing three-point support, and a fixed protrusion is arranged on a line connecting the fixed protrusion and the center of the lens, a reference hole corresponding to one of the fixed protrusions includes an opening having substantially the same size as that fixed protrusion, and the other fixed protrusions have substantially the same size and fit in loosely fitting holes. The loosely fitting holes corresponding to the fixed protrusions include larger openings than the fixed protrusions and an elongated hole corresponding to another fixed protrusion is provided in such a manner as to be elongated along a direction of the reference hole.

Abstract: A pair of disk holders each having a groove for holding a periphery portion of an optical disk are provided. The disk holders are supported so as to be movable in a direction crossing the insertion direction of the optical disk. The disk holders are biased by a biasing member in such a direction as to make them approach each other. The disk holders are individually biased by biasing members in such a direction as to make them apart from the optical disk. When insertion of the optical disk is started, the optical disk is gripped by the pair of disk holders from its both sides, and then drawn into and carried to a disk chucking position by a disk loading mechanism.

Abstract: An auto-reverse tape recording and reproducing apparatus has a mode setting means for holding a tape running direction in normal mode or reverse mode, and this mode setting means is returned to the normal mode position in connection with the return movement of an operating means for playing, only when the mode setting is in the reverse mode position, and further this mode setting means is not displaced in connection with the forward movement of a mode change-over means when a base plate of a magnetic head is in the returned position, but is displaced in connection with the forward movement of the mode change-over means when the base plate of the head is in the forward position.