Patent ID: 6031319
Filing Date: 2000-02-29
Classification: H03H

Abstract:
A quartz crystal element comprising:a substantially hexagonal quartz blank taken from an AT-cut quartz plate;a pair of holding members for holding the quartz blank;a first excitation electrode formed at a central portion of a first major surface of the quartz blank; anda second excitation electrode formed at a central portion of a second major surface of the quartz blank;wherein each pair of three pairs of opposite sides of the quartz blank are mutually parallel, one pair of the three pairs of the opposite sides are parallel to a longest diagonal line of the quartz blank, the direction of the longest diagonal line is within the range of 28.degree..+-.15.degree. from a Z' axis direction of the quartz blank, the holding members hold the quartz blank at holding ends which are the ends of the longest diagonal line, the first excitation electrode is led to one end of the longest diagonal line, and the second excitation electrode to the other end;wherein at least one of the sides parallel to the longest diagonal line has the shape of arc.