Tuning fork type crystal unit and bar type crystal unit

Details Tuning fork type crystal unit and bar type crystal unit Tuning fork type crystal unit and bar type crystal unit

2005-08-16

2005-08-16

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S328000, C310S330000, C333S200000

Reexamination Certificate

active

06930440

ABSTRACT:
A tuning fork type quartz crystal unit has a base and a pair of arms extending from respective ends of the base in a crystallographic Y direction of quartz crystal. Each of the arms comprises a first crystal member and a second crystal member which extend in the Y direction. The first crystal member and the second crystal member are joined to each other in a crystallographic YZ plane by a direct bonding such that the first crystal member and the second crystal member have respective crystallographic X directions oriented away from each other and extending parallel to each other. Each of the arms has excitation electrodes disposed respectively on a pair of exposed surfaces thereof which lie in the YZ plane. The direct bonding comprises, for example, a siloxane bond by which the first crystal member and the second crystal member are joined to each other.

REFERENCES:
patent: 6140748 (2000-10-01), Yang
patent: 6523410 (2003-02-01), Matsubara et al.
patent: 62228111 (1987-10-01), None
patent: 11-316125 (1999-11-01), None
patent: 2002-76824 (2002-03-01), None
patent: 2002-076827 (2002-03-01), None
patent: 2002188922 (2002-07-01), None
patent: 2002-204141 (2002-07-01), None

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