Patent ID: 8431030
Filing Date: 2013-04-30
Classification: H03H

Abstract:
1. A method of manufacturing a crystal resonator in which: forming a mask on both principle surfaces of an AT-cut crystal wafer that corresponds to a plurality of rectangular crystal elements and to frame sections that are respectively joined with said crystal elements by supporting sections and respectively surround said crystal elements, and etching is conducted, to thereby form a crystal wafer in which a plurality of the crystal elements are joined with the frame sections by the supporting sections; and said crystal elements are mechanically cut away from the frame sections, wherein: said mask, together with said crystal element and the frame section including the supporting section, has a projecting section, which extends along a +X-axis direction, from both side sections along the +X-axis on one end of said crystal element wherein each projecting section has first and second side walls joined by an end wall; such that a crystal wafer, in which the plurality of crystal elements joined with the frame sections by the supporting sections, is obtained by said means of etching; the projecting sections of the crystal element corresponding to said mask are separated from said frame sections at least after the etching has been conducted; and the etching is conducted while forming triangular inclined surfaces with the apexes on the tip end of each corner section of mutually opposite surfaces, between both sides of the one end section.