Title:
水晶振動子
Document Type and Number:
Japanese Patent JP7396946
Kind Code:
B2
Abstract:
To provide a specific structure preferable at individual frequencies in an AT-cut crystal oscillator having a first excitation electrode 15 of uniform thickness and a second excitation electrode 17 having an inclined portion 17a near the outer periphery.SOLUTION: The thickness of a main pressure portion 17b of a second excitation electrode is thicker than that of a first excitation electrode. A crystal piece 11 has a long side in the X-axis direction of a crystal, a short side in the Z' direction of the crystal, and the oscillation frequency of 38 MHz as the fundamental wave. The ratio of the mass of the first and second excitation electrodes to the mass of the crystal piece is 4.6%, and the confinement coefficient of the crystal piece in the crystal Z' axis direction by the first and second excitation electrodes is 4.4 to 6.0, the width of the inclined portion is set to 1 to 2.5 times the wavelength λ of the vibration in the bending mode generated by the crystal piece, and each of the first and second excitation electrodes has an elliptical shape with the long side direction of the crystal piece as the long axis and the short side direction of the crystal piece as the short axis, and the long axis length/short axis length=1.265 is satisfied.SELECTED DRAWING: Figure 1
Inventors:
Shigetaka Kaga
Masazumi Kubota
Masazumi Kubota
Application Number:
JP2020056974A
Publication Date:
December 12, 2023
Filing Date:
March 27, 2020
Export Citation:
Assignee:
Nippon Denpa Industry Co., Ltd.
International Classes:
H03H9/19
Domestic Patent References:
| JP2018117198A | ||||
| JP2018098592A |
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