Quartz-crystal unit

Details Quartz-crystal unit Quartz-crystal unit

2005-12-06

2005-12-06

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06972511

ABSTRACT:
A quartz-crystal unit comprises a container body having a recess, a quartz-crystal blank having a pair of excitation electrodes respectively disposed on one and the other principal surfaces, and a pair of extending electrodes respectively extended from the pair of excitation electrodes, and a cover for sealing an opening plane of the recess. The extending electrodes are led to both sides of one end of the crystal blank, and the one end is secured by a conductive adhesive to hold the crystal blank in the recess in parallel to the cover. The crystal unit satisfies 0<d/L<0.64, where L is the length from the one end to the other end opposing the one end in the crystal blank, and d is a gap between mutually opposing surfaces of the crystal blank and the cover.

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