Ultrasonic motor
AssigneeFuji Photo Film Co., Ltd.
InventorsYoji Naka, Yutaka Yoshida
Life of this patent
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Abstract
An ultrasonic motor has first and second elastically vibrating rotatable means and third rotatable means interposed between the first and second rotatable means. The first and second rotatable means, which are made elastic disk members, generate mechanical vibrations by means of an electrostrictive effect of piezoelectric elements cooperating therewith. Locking means is provided in association with the first to third rotatable means so as to selectively engage with the first to third rotatable means, whereby allowing the rotation of at least one of the first to third rotatable means.
Claims14
An ultrasonic motor comprising:
- first rotatable means which is elastic and generates mechanical vibrations caused by means of an electrostrictive effect of a first piezoelectric element cooperating therewith;
- second rotatable means which is elastic and generates mechanical vibrations by means of an electrostrictive effect of a second piezoelectric element cooperating therewith;
- third rotatable means interposed between the first and second rotatable means so as to rotate as a result of the mechanical vibrations of the first and second rotatable means;
- and
- locking means selectively engageable with the first to third rotatable means to permit a rotation of at least one of the first to third rotatable means.
An apparatus used in a camera comprising:
- an ultrasonic motor having first rotatable means which is elastic and generates mechanical vibrations by means of an electrostrictive effect of a first piezoelectric element cooperating therewith;
- second rotatable means which is elastic and generates mechanical vibrations by means of an electrostrictive effect of a second piezoelectric element cooperating therewith;
- third rotatable means interposed between said first and second rotatable means so as to rotate as a result of the mechanical vibrations of said first and second rotatable means;
- locking means selectively engageable with said first to third rotatable means to permit a rotation of at least one of said first to third rotatable means;
- and
- at least a first and second camera element driven by said first to third rotatable means, the first camera element being driven by the output of said first and second rotatable means when said locking means engages with said third rotatable means, while the second camera element is driven by the output of said third rotatable means when said locking means engages with said first and second rotatable means.
An apparatus used in a camera comprising:
- first and second rotatable means having piezoelectric elements and elastic members generating mechanical vibrations in cooperation with said piezoelectric elements;
- third rotatable means disposed between said first and second rotatable means, said third rotatable means receiving said mechanical vibrations from said elastic members and supporting said first and second rotatable means rotatable thereon;
- locking means for locking the rotation of said third rotatable means;
- and
- a pair of shutter blades respectively fixed to said first and second rotatable means, wherein said first and second rotatable means are driven by said mechanical vibrations from said elastic members to rotate in opposite directions, opening and closing said shutter blades.
Dependencies are inferred from the claim text.