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US 8,476,984 B2Granted
Vibration device, oscillator, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorKunihito Yamanaka
Life of this patent
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Abstract
A vibration device includes: a first vibrator having a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is −γ1, where γ1>0; and a second vibrator which is connected to the first vibrator, and has a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is γ2, where γ2>0, wherein a difference between inflection points of the first and second vibrators is equal to or lower than 19° C., and a relationship of 0<|γ1|≦|2.4γ2| is satisfied.
Claims11
A vibration device comprising:
- a first vibrator having a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is −γ1, where γ1>0;
- and
- a second vibrator which is connected to the first vibrator, and has a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is γ2, where γ2>0,
- wherein a difference between inflection points of the first and second vibrators is equal to or lower than 19° C., and
- a relationship of 0<|γ1|≦|2.4γ2| is satisfied.
2 more elements
A method of manufacturing a vibration device, the method comprising:
- manufacturing a first vibrator having a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is −γ1, where γ1>0;
- manufacturing a second vibrator having a 3rd-order function temperature characteristic in which a 3rd-order temperature coefficient is −γ2, where γ2>0;
- selecting a combination of the first and second vibrators, from first and second vibrator groups which are manufactured, satisfying a relationship of 0<|γ1|≦|2.4γ2| and having a difference between inflection points equal to or lower than 19° C.;
- and
- connecting the selected first and second vibrators.
2 more elements
Dependencies are inferred from the claim text.