Nihon Dempa Kogyo Co., Ltd.

Masanobu Okazaki

Hitoshi Sekimoto

Morio Onoue

Satoshi Akutsu

Susumu Ebihara

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;.

Piezoelectric crystal material and piezoelectric resonator

A multifunctional crystal unit in which in the same container constituted by a container body having a recess therein and a cover, a plurality of crystal blanks are hermetically encapsulated. In the container, the crystal blanks are respectively held in different spaces, which are isolated from one another by a shielding member. Hereby, respective crystal blanks are electrically shielded from one another. As the plurality of crystal blanks, a crystal blank of AT cut for generating a communication frequency signal, and a tuning fork type crystal blank for generating a clock signal are preferably used.

Multifunctional crystal unit and method of manufacturing the same

A thickness shear quartz crystal oscillator has two major surfaces which extend in the direction the of X axis of the crystal and which are 5mm to 10mm long. X-Z plane defined by the X axis and Z axis of the crystal is rotated about the X axis by 35.degree.08' to 35.degree.16' so that the major surfaces are parallel to an X-Z' plane defined by the X axis and an imaginary Z' axis inclined to the Z axis at 35.degree.08' to 35.degree.16'. One of the major surfaces is displaced in the direction of the Z' axis to thereby cause the side faces of the oscillator to incline at an angle of 4.degree. to 6.degree..

Growing community of inventors

Saitama, Japan

Masanobu Okazaki