Mitsumi Electric Company Ltd.

Soumei Takahashi

Tsukasa Yamada

Takahiko Nishiyama

Toyoki Tanaka

Kenichi Hori

Hisamichi Sekine

Kazutomo Imi

Tsuyoshi Ishii

Kenichi Negoro

A piezoelectric actuator including first and second piezoelectric cantilevers is disclosed. Wirings are provided on an upper surface of a support body on which the first and second piezoelectric cantilevers are formed. The wirings are formed of patterned metal films.

Piezoelectric actuator and a method of manufacturing the same

A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The moving portion is driven by equalizing a constant expanding speed of the electro-mechanical transducer with a constant contracting speed of the electro-mechanical transducer and by setting a constant rest time interval after one of contraction of the electro-mechanical transducer and expansion of the electro-mechanical transducer.

Method of driving a driving device

A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The stationary member consists essentially of a base alloy which consists of, by weight, 88 to 97% tungsten, 2 to 11% nickel as a binder, and, as the balance, 0.1 to 2% at least one metal having an ionization tendency which is higher than that of tungsten. The stationary member has a surface without nickel plating.

Driving device having suitable stationary member as material

A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. A frictionally coupled portion has a height (a length of the vibration friction portion in a sliding direction in contact with the moving portion) which is not more than 1.15 mm.

Driving device capable of reducing height thereof

A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a static member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The driving device is covered with a cabinet. An elastic member lies between the cabinet and the static member.

Driving device capable of obtaining a stable frequency characteristic

A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The vibration friction portion is made of a material having a vibration transfer rate of 4900 meters/second or more. The moving portion is made of a material which has a vibration transfer rate of 4900 meters/second or more and which is different from that of the vibration friction portion.

Driving device capable of transferring vibrations generated by an electro-mechanical transducer to a vibration friction portion with a high degree of efficiency

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Tokyo, Japan

Soumei Takahashi