CRYSTAL VIBRATOR AND ITS MANUFACTURE

Japanese Patent JP3885281

B2

PROBLEM TO BE SOLVED: To obtain a stable resonance frequency and a filter frequency even when an ambient temperature is fluctuated by forming an inverted axis section having an electric axis in an opposite direction to an electric axis of an exciting section at a position different from an position of the exciting section in a crystal substrate.
SOLUTION: Axis inversion sections 11, 12 are formed in the vicinity of both sides in a crystal substrate 1 and at both sides of an exciting section 4 and have an electric axis -X in an opposite direction to an electric axis X of the exciting section 4. When a high frequency voltage in the vicinity of the resonance frequency is applied between the electrodes 2, 3, most of the vibration energy is concentrated to the exciting section 4 by the energy confinement effect based on the mass addition effect of the electrodes 2, 3. Part of the energy is leaked and reached the axis inversion sections 11, 12. As a result, the positive temperature coefficient and the negative temperature coefficient cancel each other to compensate for the temperature characteristic. Thus, a stable resonance frequency is obtained without the use of a temperature compensation circuit or the like.

Takehiko Uno
Eiji Kamiyama
Ueoka Yasushige

JP10989497A

February 21, 2007

April 25, 1997

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Mitsubishi Materials Corporation

H03B5/32; H03H9/19; H03H3/02; (IPC1-7): H03H9/19; H03B5/32; H03H3/02

JP7066673A
JP55049018A
JP60196634A
JP4029217U

US4365182

Masatake Shiga
Takashi Watanabe
Shigeo Naruse

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