Abstract: A piezoelectric motor constructed so as to convert deformation movements of a plurality of electrostrictive elements to a rotatory movement and then to output it through an output shaft as rotary power at a low speed. The piezoelectric motor includes a plurality of electrostrictive elements, a disk-shaped precessional movement plate supported to be driven by the deformations of these electrostrictive elements and to perform a precessional movement without rotation on its axis, a rotary plate arranged to be driven at a reduced speed by a circumferential difference between circular paths described by contact under pressure, at a precessional angle .theta. with a peripheral portion of the precessional movement plate. An output shaft is operatively connected to the rotary plate to deliver output power.

Abstract: A film end holding device comprises a film holding plate, an operating plate, guide bushes and a contact member, in which the operating plate moves obliquely when pushed in the axial direction of a drum on which a film is to be fixed. The holding plate moves in the circumferential direction of the drum, and the operating plate (17) runs on an angle portion of the holding plate so that an end of a film may be held by the contact member of the holding plate on the drum.

Abstract: A device for switching a scanning beam diameter, incorporated into a picture image scanning and recording device, which switches the diameter of the scanning beam in response to the density of number of scanning lines. The beam from a scanning light generator is branched at least into two optical paths and the diameter of at least one of the branched beams is magnified by a beam expander. The branched optical paths are unified again into a single path and, in order to pass the beam through one desired optical path a shutter device is provided.