Sumida Corporation

Kentaro Masuda

Tetsuo Yoshida

Motomi Takahashi

Yukio Aizawa

Shigemi Suganuma

An ultrasonic motor () includes a vibrator () and an application means (oscillation circuit). A first vibrator area () and a second vibrator area (), which form a vibrator (), include piezoelectric elements polarized in the thickness direction, and fixed portions () respectively. The oscillation circuitapplies an AC voltage to the piezoelectric elements respectively and makes the first vibrator area () and the second vibrator area () resonate individually in the surface-spreading directions. The ultrasonic motor () includes a coupling portion () for coupling vibration end portions () each other and a contact element () which is provided on this coupling portion (). The vibration end portions () are positions which vibrate respectively in the approaching and separating directions by the resonances of the first vibrator area () and the second vibrator area () in the surface-spreading directions with respect to the fixed portions ().

Ultrasonic motor

A specific condition for enhancing the power generation efficiency of an oscillation type electromagnetic power generator is disclosed. Solenoid coils constituting the oscillation type electromagnetic power generator are wound in directions opposite to each other with a predetermined coil gap therebetween. Adjacent magnets of a movable magnet are connected to each other via a spacer having a predetermined thickness in such a manner that poles with the same polarity are opposed to each other. A coil pitch which is the total dimension of the coil length of one solenoid coil and the coil gap and a magnet pitch which is the total dimension of the magnet length of one magnet of the movable magnet and the thickness of the spacer are almost equal to each other, and the coil length is shorter than the magnet length.

Growing community of inventors

Tokyo, Japan

Kentaro Masuda