Jianq Chyun IP Office
Crystal resonator including blank and supporting portion
A crystal resonator includes a blank and a supporting portion. The blank is cut out from a crystal parallel to a surface that includes a X″-axis and a Z″-axis respectively obtained by rotating an X′-axis and a Z′-axis by 45° around a Y′-axis in a direction from the Z′-axis toward the X′-axis. The X′-axis, the Y′-axis, and the Z′-axis are respectively obtained by rotating a crystallographic X-axis, Y-axis, and Z-axis of the crystal by equal to or more than +37° and equal to or less than 51.5° around the X-axis. The supporting portion is connected to an outer periphery of the blank at a position near an apex of the reference rectangle and where a displacement of vibration in the X″-axial direction or the Z″-axial direction becomes a local minimum when two longitudinal modes of vibration are coupled.
NIHON DEMPA KOGYO CO., LTD.
H H
H03H H03H
inventional inventional
Hiroaki Takashi
Yamada Yamaguchi