US Patent No. 10,250,224

PIEZOELECTRIC VIBRATING PIECE AND PIEZOELECTRIC DEVICE


Patent No. 10,250,224
Issue Date April 02, 2019
Title Piezoelectric Vibrating Piece And Piezoelectric Device
Inventorship Shigetaka Kaga, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,250,224

1. A piezoelectric vibrating piece, comprising:a vibrating piece body, including a vibrator; and
at least a pair of excitation electrodes, being formed on a front surface and a back surface of the vibrator, respectively,
wherein the vibrating piece body is a doubly rotated quartz-crystal vibrating piece cut out parallel to an X?-Z? surface, the X?-Z? surface being rotated around a Z-axis of a crystallographic axis of a crystal and further rotated around an X?-axis; and
the pair of excitation electrodes are collocated in a Z??-axis direction determined by an X??-axis, the X??-axis being defined by counterclockwise rotation from a +X?-axis direction around a Y?-axis by 260° to 300°, the pair of excitation electrodes being disposed inclined with respect to an Y?-axis direction.