Method for design piezoelectric resonator electrode shapes

A design method and electrode shape technology, applied in electrical components, impedance networks, etc., can solve the problems of rectangular electrode stress concentration, adverse effects on the overall performance of the resonator, and the inability to meet the miniaturization of the electrode trapped resonator.

Inactive Publication Date: 2008-09-03
CENT SOUTH UNIV
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Problems solved by technology

The shape of the electrode in the existing quartz crystal resonator is circular or rectangular, which has not been fully optimized, and cannot meet the requirements of electrode energy trapping, resonator miniaturization and Bechmann number. Among them, the rectangular electrode is easy to cause stress concentration at the corner. have an adverse effect on the overall performance of the resonator

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  • Method for design piezoelectric resonator electrode shapes
  • Method for design piezoelectric resonator electrode shapes
  • Method for design piezoelectric resonator electrode shapes

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Embodiment Construction

[0028] Such as figure 1 As shown, the piezoelectric crystal resonator is composed of a piezoelectric plate 1 in the middle layer and two upper and lower electrode plates 2. x 1 Axis and x 3 The axis is the coordinate axis in the plane, x 2 It is the normal coordinate axis of the plate: the thickness of the piezoelectric plate 1 is 2h, and the density is ρ; the thickness of each electrode plate 2 is 2h', the density is ρ', and the length of the section is 2L.

[0029] Select in the calculation: 2h=1mm, Figure 2-Figure 5 It analyzes the dimensionless polar radius r=L / (4h) and the angle expressed by the Cartesian coordinate system. The relationship between the two parameters.

[0030] From figure 2 It can be seen that the optimal electrode shape for At-cut quartz plate and Y-cut quartz plate resonators is close to an ellipse, but it is not a standard ellipse. The long axis is about 25% longer than the short axis; for the Y-cut quartz plate resonator and the elliptical shape The ga...

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Abstract

A piezoelectric resonator electrode shape design method is disclosed. The electrode shape at each direction can satisfy Bechmann number, thereby all the particle vibration covered by a same electrode are in the same phase. According to Y cutting quartz plate, At cutting quartz plate and Y cutting crystal plate thickness shearing resonator, the shaft x1 and the shaft x3 are coordinate axis in a place, x2 is a normal coordinate axis of the plate, Phi is a rotation angle from the shaft x1 to the shaft x3 in the plane, the electrode length L follows the expression (the above formula) of the angle Phi. The resonator structure of electrode after optimum design is portable, with good performance and high precision, which is propitious to miniaturization of device; meanwhile design method is simple and easy of bulk production.

Description

Technical field [0001] The invention relates to an optimized design method of electrodes in a piezoelectric crystal resonator. Background technique [0002] Quartz crystal resonators are the basic components of various electronic products, and have important applications in many fields such as household appliances, communications, navigation, precision timing, and sensors. The electrode is an important part of the resonator, and it has an important influence on the miniaturization and accuracy of the resonator. [0003] The electrode is used to excite the mechanical vibration of the resonator, and its quality can realize the energy trap function. With the development of the miniaturization of the resonator, the research on the shape of the electrode has received more and more attention. The shape of the electrodes in the existing quartz crystal resonators is circular or rectangular, and the design is not fully optimized, and cannot meet the requirements of electrode trapping, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/13
Inventor 杨增涛杨嘉实蒋树农郭少华李显方
Owner CENT SOUTH UNIV
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