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US 8,558,628 B2Granted
Piezoelectric vibrating piece, piezoelectric vibrator, oscillator, electronic apparatus, and radio timepiece
AssigneeSII Crystal Technology Inc.
InventorTakashi Kobayashi
Life of this patent
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Abstract
A piezoelectric vibrating piece includes a pair of vibration arm portions that is placed in a row in a width direction; a base portion to which proximal end sides in the pair of vibration arm portions in an extending direction are connected; and weight metal films that are formed on outer surfaces of the vibration arm portions, wherein the weight metal films are formed in positions that avoid regions of tip portions in the vibration arm portions in a longitudinal direction.
Claims8
A piezoelectric vibrating piece comprising:
- a base portion;
- a pair of vibration arm portions extending from the base portion and adjacent to one another in a width direction,
- the pair of vibrating arm portions having proximal ends connected to the base portion and distal ends away from the base portion in an extending direction;
- and
- weight metal films on outer surfaces of the vibration arm portions,
- wherein the weight metal films avoid the distal ends of the vibration arm portions, such that the distal ends are free of metal,
- the weight metal films comprise a first rough frequency adjustment metal film and a second minute frequency adjustment metal film adjacent to the first rough frequency adjustment metal film, and
- the first rough frequency adjustment metal film has a thickness greater than that of the second minute frequency adjustment metal film.
5 more elements
Dependencies are inferred from the claim text.