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Piezoelectric device

A technology of piezoelectric devices and piezoelectric substrates, applied in circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as the deterioration of piezoelectric device characteristics, reduce frequency jumps, Suppression of unwanted vibrations and excellent accuracy

Inactive Publication Date: 2018-08-28
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In piezoelectric devices using thickness shear vibration, there are main vibrations and other vibrations, namely unwanted vibrations, and when the two are combined, the characteristics of the piezoelectric device deteriorate

Method used

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Experimental program
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no. 1 approach

[0068] Figure 1A , Figure 1B , Figure 1C It is a figure explaining the piezoelectric device 10 which concerns on 1st Embodiment of a 1st aspect. especially, Figure 1A is a plan view of the piezoelectric device 10, Figure 1B for along Figure 1A A cross-sectional view of the IB-IB line, Figure 1C for along Figure 1A Cross-sectional view of an IC-IC wire. also, Figure 1A omitted Figure 1B , Figure 1C An illustration of the cover member 19 is shown.

[0069] The piezoelectric device 10 includes: a piezoelectric substrate 11, a first excitation electrode 13a, a first extraction electrode 13b, a second excitation electrode 13c, a second extraction electrode 13d, a first unnecessary vibration suppression electrode 13e, a second unnecessary vibration Vibration suppressing electrode 13 f , container 15 , conductive adhesive 17 , and cover member 19 . Hereinafter, these constituent components will be described.

[0070] The piezoelectric substrate 11 is capable of thi...

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PUM

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Abstract

A piezoelectric device has a structure of suppressing useless vibrations, and includes a piezoelectric substrate, a first excitation electrode and a first extraction electrode arranged on a first mainsurface of the piezoelectric substrate, and a second excitation electrode and a second extraction electrode arranged on a second main surface of the piezoelectric substrate. Further, a first unnecessary vibration suppression electrode is disposed on a region opposed to the second extraction electrode on the first main surface and has a potential same with the second excitation electrode; a secondunnecessary vibration suppression electrode is disposed on a region opposed to the first extraction electrode on the second main surface and has a potential same with the first excitation electrode.

Description

technical field [0001] The present invention relates to a piezoelectric device (piezoelectric device) such as a piezoelectric vibrator and a piezoelectric oscillator vibrating in a thickness-shear vibration mode. Background technique [0002] In various electronic devices, piezoelectric devices such as crystal resonators and crystal oscillators are often used for frequency selection or control. Among typical piezoelectric devices, there is a piezoelectric device utilizing thickness shear vibration. In terms of crystal resonators, it is a double-rotation cut crystal resonator represented by an AT cut crystal resonator and an SC cut crystal resonator. [0003] In a piezoelectric device using thickness shear vibration, there are main vibration and other vibrations, that is, unwanted vibration, and when the two are combined, the characteristics of the piezoelectric device deteriorate. As a technology for suppressing unnecessary vibration, for example, the prior art column of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/17H03H9/13
CPCH03H9/13H03H9/17H03H9/132H03H9/02102H03H9/19H03H9/1021H03H9/0519H03H9/0509H10N30/87H10N30/88
Inventor 洼田正积渡辺善弘
Owner NIHON DEMPA KOGYO CO LTD