Ngk Spark Plug Company, Limited

The Fujikura Cable Works Limited

Seidensha Electronics Co., Ltd.

Nippon Tokushu Togyo Kabushiki Kaisha

Kozo Okada

Eiji Mori

Sadayuki Ueha

Eiji Ozeki

Toshiharu Ito

Setsuya Isshiki

Hiroto Oshima

Michiyuki Masuda

Tetsuo Shiromizu

Saburo Ueno

Kiyoshi Kazunaga

A rotary driver is disclosed, which comprises a solenoidal oscillation element consisting of an electrostriction element polarized in radial directions or vertical directions and provided with electrodes on pair opposite surfaces perpendicular to the direction of polarization. The electrode on either one of the pair opposite surfaces is uniformly divided by x greater than four. AC voltages of V.sub.o sin .omega.t shifted in phase from each other by 2.pi./x are applied to the division electrodes. A driven member is held in contact with at least one of the opposite surfaces of the solenoidal oscillation element.

Piezoelectric rotary driver

An improved ultrasonic transducer including an oscillation housing composed of a cylindrical side plate and a wave transmitting and receiving top plate provided at one end of the side plate, a piezoelectric element integrally bonded to the inside of the top plate for oscillation therewith, and electrodes arranged on the piezoelectric element so that ultrasonic waves may be generated from the top plate when an electric field is applied to the electrodes and/or an electric output is delivered from the electrodes when the top plate receives ultrasonic waves. The improvement includes the oscillation housing which is formed, at least in its top plate, of a porous plastic material.

Piezoelectric ultrasonic transducer with porous plastic housing

In the ultrasonic apparatus being so constructed as to be capable of directing the oscillation of ultrasonic waves to the inner part of a container and the like, an ultrasonic apparatus characterized by the provision of an ultrasonic wave transfer preventive member to ensure the prevention of transfer of ultrasonic waves to unintended matters other than the object matter.

Ultrasonic apparatus

An ultrasonic device for convergently radiating ultrasonic energy including a metallic ring vibrated to resonance by at least one electromechanical transducer fixed on the outer circumference of the ring, thereby to deliver high power ultrasonic waves from the inner circumference of the ring into the vacant center thereof.

Ultrasonic device

Growing community of inventors

Nagoya, Japan

Kozo Okada