Film winding/rewinding mechanism of camera

摘要

A film winding/rewinding mechanism of a camera driven by an ultrasonic wave motor. The winding driving section includes a cylindrical spool and a cylindrical first ultrasonic wave vibrator provided in the spool. A roller urged by a leaf spring is pressed against the peripheral surface of the spool, so that the peripheral surface of the vibrator contacts the inner surface of the spool at a point in the circumferential direction thereof. The film rewinding driving section includes a film rewinding fork, a cylindrical member mounted on the periphery of the rewinding fork, and a cylindrical second ultrasonic wave vibrator provided between the rewinding fork and the cylindrical member. The diameter of the outer circumference of the second ultrasonic wave vibrator is greater than the diameter of the outer circumference of the first vibrator. In winding/rewinding the film, the cylindrical member is urged by the tension of the film, so that the peripheral surface of the cylindrical member contacts the peripheral surface of the second vibrator contacts at a point in the circumferential direction thereof. In winding the film, a voltage is applied to the first vibrator to rotate the spool. In rewinding the film, a voltage is applied to the second vibrator to rotate the fork.