Nihon Dempa Kogyo Co., Ltd.

Morio Onoue

Hitoshi Sekimoto

Masanobu Okazaki

In a gallium phosphate crystal, a crystallographic Y-axis and a Z-axis that have been rotated about an X-axis counterclockwise through an angle &#x3b1; is referred to as a Y'-axis and a Z&#x2032;-axis, respectively, where the angle &#x3b1; is in a range from 10&#xb0; to 20&#xb0;. A piezoelectric crystal material made of gallium phosphate is provided as a plate-shaped member which is elongate in an X-axis direction and cut from the gallium phosphate crystal parallel to an X-Z&#x2032; crystal plane of the gallium phosphate, and the plate-shaped member has sides parallel to an axis that is obtained by rotating the Y&#x2032;-axis counterclockwise about the X-axis in an angular range from 1&#xb0; to 3&#xb0;.

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Tokyo, Japan

Morio Onoue