US Patent No. 9,876,157

SURFACE MOUNT TYPE QUARTZ CRYSTAL DEVICE


Patent No. 9,876,157
Issue Date January 23, 2018
Title Surface Mount Type Quartz Crystal Device
Inventorship Akihiro Kanamaru, Saitama (JP)
Takuya Kuwayama, Saitama (JP)
Yasunori Hosokawa, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 9,876,157

1. A surface mount type quartz crystal device, having a long side direction as a Z?-axis direction, a height direction as
a Y?-axis direction, and a X-axis direction perpendicular to the Y?-axis direction and the Z?-axis direction, and the surface
mount type quartz crystal device comprising:
a ceramic package;
a pedestal blank formed of a quartz-crystal material, the pedestal blank being placed within the ceramic package via a conductive
adhesive;

a quartz-crystal vibrating piece formed in a rectangular shape having a long side and a short side, the quartz-crystal vibrating
piece including a pair of excitation electrodes and a pair of extraction electrodes, the pair of extraction electrodes being
extracted from the pair of excitation electrodes to one end of the quartz-crystal vibrating piece in an extending direction
of the long side, the quartz-crystal vibrating piece being placed on the pedestal blank, wherein

the conductive adhesive is formed along an outer peripheral side of the pedestal blank so as to avoid overlap with the excitation
electrode viewed in a normal direction of the excitation electrode, and the Y?-axis direction is the normal direction, and

the pedestal blank is formed to avoid a region where a distance from the quartz-crystal vibrating piece is equal to or smaller
than a size of a clearance between the pedestal blank and the quartz-crystal vibrating piece at the outer peripheral side,
in a region where the excitation electrode faces at the pedestal blank side viewed in the normal direction, and

the excitation electrode on the quartz-crystal vibrating piece is arranged so as not to have the pedestal blank and the conductive
adhesive overlapped in the Y?-axis direction that is the normal direction.