Vibration generating device for presenting haptic sensation using piezoelectric actuator and electronic apparatus using same
AssigneeTaiyo Yuden Co., Ltd.
InventorsFumihisa Ito, Yukihiro Matsui, Hiroshi Hamada
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Abstract
A vibration generating device includes: a vibrator; and a piezoelectric actuator. The vibrator has a first main surface and a second main surface on a side opposite to the first main surface. The piezoelectric actuator is joined to the second main surface. A plurality of recessions and projections is formed at equal intervals on the first main surface. The vibration generating device is configured to be capable of presenting a haptic sensation while preventing a contact sound from being generated.
Claims11
A vibration generating device, comprising:
- a vibrator that has a first main surface and a second main surface on a side opposite to the first main surface;
- and
- a piezoelectric actuator joined to the second main surface, wherein
- a plurality of recessions and projections is formed at equal intervals on the first main surface,
- the plurality of recessions and projections are constituted by recessed portions and projecting portions, and
- the recessed portions extend in a first direction parallel to the first main surface, the projecting portions extend in the first direction, and the recessed portions and the projecting portions are formed alternately in a second direction parallel to the first main surface and perpendicular to the first direction.
An electronic apparatus, comprising:
- a vibration generating device that includes
- a vibrator that has a first main surface and a second main surface on a side opposite to the first main surface, and
- a piezoelectric actuator joined to the second main surface, wherein
- a plurality of recessions and projections is formed at equal intervals on the first main surface,
- the plurality of recessions and projections are constituted by recessed portions and projecting portions, and
- the recessed portions extend in a first direction parallel to the first main surface, the projecting portions extend in the first direction, and the recessed portions and the projecting portions are formed alternately in a second direction parallel to the first main surface and perpendicular to the first direction.
A vibration generating device, comprising:
- a vibrator that has a first main surface and a second main surface on a side opposite to the first main surface;
- a piezoelectric actuator that is joined to the second main surface;
- and
- a drive device that supplies a drive signal of a frequency of 60 kHz or more to the piezoelectric actuator,
- wherein the vibrator is a plate-shaped member wherein sound pressure characteristics of the vibrator has a peak of sound pressure at ¼ of a frequency of the drive signal in use when a user's finger touches the first main surface of the vibrator, and has another peak of sound pressure at a frequency higher than ¼ of the frequency of the drive signal in use when the user's finger does not touch the first main surface of the vibrator.
An electronic apparatus, comprising:
- a vibration generating device that includes a vibrator that has a first main surface and a second main surface on a side opposite to the first main surface, a piezoelectric actuator that is joined to the second main surface, and a drive device that supplies a drive signal of a frequency of 60 kHz or more to the piezoelectric actuator,
- wherein the vibrator is a plate-shaped member wherein sound pressure characteristics of the vibrator has a peak of sound pressure at ¼ of a frequency of the drive signal in use when a user's finger touches the first main surface of the vibrator, and has another peak of sound pressure at a frequency higher than ¼ of the frequency of the drive signal in use when the user's finger does not touch the first main surface of the vibrator.
Dependencies are inferred from the claim text.