Nikko Company

Ishikawa Prefecture

Tokyo Institute of Technology

Ishikawa Prefectural Government

Mikio Takimoto

Masahiro Takano

Kiyoshi Mizushima

Kenichi Hirosaki

Naoki Kidani

Takashi Yoshida

Kentaro Nakamura

Yuta Yoshida

Takuya Nagata

Hiroshi Kawai

Shou Makino

Koji Ando

Satoru Ichimura

Ryuji Shintani

Masayuki Ishida

Electrodes (), having curved sections in the shape of the outline thereof, are disposed in areas of a rectangular plate-shaped piezoelectric transducer element () in which the strain in the natural mode of vibration is large. The electrodes () which excite a bending vibration are disposed in areas in which the strain in the bending natural mode is at least a predetermined value, and the outline curved sections of the electrodes () are shaped so as to follow along strain contours (), and the electrode () which excites a stretching vibration is disposed in an area in which the strain in the stretching natural mode is at least a predetermined value, thus providing a transducer for an ultrasonic motor which aims to reduce transducer loss (increasing vibration efficiency), and improve transducer durability and reliability.

Transducer for ultrasonic motor

A holding device for a piezoelectric vibrator including a support member () for separately accommodating a piezoelectric vibrator (), a first plate spring member () which extends from a proximal end fixedly bonded to one side of the support member () so as to sandwich opposing sides of the piezoelectric vibrator () and is folded back to be fixedly bonded to the piezoelectric vibrator, and a second plate spring member () which extends from a proximal end fixedly bonded to another side of the support member () so as to sandwich the opposing sides of the piezoelectric vibrator () and is folded back to be fixedly bonded to the piezoelectric vibrator. The first plate spring member () and the second plate spring member () are integrated at portions fixedly bonded to the piezoelectric vibrator ().

Apparatus for holding piezoelectric vibrator

In the invention, each piezoelectric element for a vibrator for an ultrasonic motor has electrode regions for exciting stretching vibration and flexural vibration separately. Thus, the invention provides a vibrator for an ultrasonic motor, in which electrodes are provided for applying voltage to each of the polarized region, and further provides a stack-type piezoelectric vibrator for an ultrasonic motor, consisting of a stack of the said vibrators and having an extraction electrode pattern provided for short circuit with an external electrode. The vibrator of the invention has high controllability, especially in a fine movement region and is useful as a driving source in a positioning device, in which enhanced vibration efficiency can be obtained.

Piezoelectric vibrator for ultrasonic motor

A low temperature sintering ceramic composition can be sintered at 850 to 1,000&#xb0; C., and the sintered ceramic has a low dielectric constant (9 or less at 16 Ghz or more) and a high Qf (10,000 or more). The composition can be co-sintered with wiring material containing Ag, Au, or Cu. The ceramic composition includes (by mass) CaO, MgO, and SiOin total: over 60% to 98.6%; BiO: from 1% to under 35%; and LiO: from 0.4% to under 6%; wherein (CaO+MgO) and SiOare contained in the molar ratio of from 1:1 to under 1:2.5.

Low temperature sintering ceramic composition for high frequency, method of fabricating the same and electronic component

A low temperature sintering ceramic composition that can be sintered at a temperature equal to or less than 1000&#xb0; C. and has low dielectric constant and dielectric loss in a high frequency region of 17 Ghz or more, an electronic component using the same and a method of fabricating the low temperature sintering ceramic are provided. The composition comprises MgO and SiOin sum total in the range of from 64.0 to 99.2% by mass; BiOin the range of from 0.4 to 33.0% by mass; LiO in the range of from 0.4 to 3.0% by mass; and MgO and SiOare contained in the molar ratio of from 2:1 to 2:3.5, at least part thereof being contained as a complex oxide of Mg and Si.

Low temperature sintering ceramic composition for use in high frequency, method of fabricating the same and electronic component

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Ishikawa, Japan

Mikio Takimoto