CRYSTAL DIAPHRAGM

• Main Author: KODA NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 19.10.2017
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

PROBLEM TO BE SOLVED: To provide a crystal diaphragm which is difficult to be effected by an unnecessary vibration mode other than a thickness-shear vibration without preventing reduction of the size of the crystal diaphragm.SOLUTION: A crystal diaphragm 1 is a thickness-shear vibration mode. In the crystal diaphragm, a first main surface 11 and a second main surface 12 are provided in front and back surfaces, and a first ridge 15 and a second ridge 16 which oppositely connect a first side surface 13 and a second side surface 14 constructed by an axial symmetry arc to the side surface and the first side surface and the second side surface. In the first and second main surfaces of the crystal diaphragm, a first excitation electrode 2 and a second excitation electrode 3 which are faced each other and extraction electrodes 4 and 5 extending the excitation electrode to an end part of the main surfaces of the crystal diaphragm are formed. The first and second excitation electrodes are formed in the axial symmetry along a straight line coupling the first and second ridges.SELECTED DRAWING: Figure 1 【課題】 水晶振動板の小型化を妨げることなく厚みすべり振動以外の不要振動モードの影響を受けにくい水晶振動板を提供する。【解決手段】 厚みすべり振動してなる水晶振動板１であって、上記水晶振動板には、表裏面に第１主面１１と第２主面１２を有し、側面に線対称の弧で構成された第１側面１３と第２側面１４、および上記第１側面と第２側面とをつなぎお互いに対向する第１稜１５と第２稜１６を有しており、上記水晶振動板の第１主面と第２主面には、お互いに対向する第１励振電極２と第２励振電極３と、上記励振電極を水晶振動板の各主面の端部へと延出する引出電極４，５とが形成され、上記第１励振電極と第２励振電極とは、上記第１稜と第２稜とを結ぶ直線に沿って線対称に形成されている。【選択図】 図１