Matsushita Electric Industrial Co., Ltd.

Kunitoshi Kawano

Yasushi Goto

Seiichi Minami

Kaneichi Kondo

Kazuhiro Okuda

Hiroshi Fukushima

Satoshi Kawamura

Yuji Shingu

Tomokazu Yamaguchi

A laminated piezoelectric transformer according to the present invention comprises (a) a laminated body formed by laminating a plurality of ceramic layers and a plurality of internal electrodes and (b) a plurality of external electrodes electrically connected with the internal electrodes and disposed on the surface of the laminated body. Further, the internal electrodes of the laminated piezoelectric transformer of the invention are characterized by having a plurality of primary internal electrodes positioned at the middle portion along the longitudinal direction of the laminated body and a plurality of secondary internal electrodes positioned at both end portions of the laminated body. By virtue of this configuration of the invention, the polarization volume on the secondary side can be enlarged and, therefore, the laminated piezoelectric transformer of the invention can step up voltages at high energy conversion efficiency.

Laminated piezoelectric transformer

The present invention provides a high voltage generating device utilizing a piezoelectric element. The device comprises an outer rotary member having a plurality of saw tooth-like cam lobes formed on its outer circumference equidistant from each other and an inner rotary member disposed in the outer rotary member. A cam follower for applying an impact to a piezoelectric element is biased toward the outer rotary member to cooperate with one of the cam lobes. The inner rotary member has a ball mounted therein and a spring for biasing the ball radially outwardly into operative engagement with an inner surface of the outer rotary member. The inner surface of the outer rotary member is so constructed and arranged as to permit free rotation of the inner rotary member unless the inner rotary member is depressed and turned in a predetermined direction. Under this condition the outer rotary member will rotate in the same rotational direction to cause the cam lobes to actuate the cam follower at several times, thus causing the piezoelectric element to produce a series of sparks.

Piezoelectric high voltage generating device

Growing community of inventors

Minamikawachi-gun, Japan

Kunitoshi Kawano