Oscillator and electronic device

Patent metadata

Field	Value
Publication number	US-9252711-B2
Application number	US-201214008383-A
Country	US
Kind code	B2
Filing date	Mar 8, 2012
Priority date	Mar 31, 2011
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

Provided is an oscillator ( 100 ) including a piezoelectric body ( 70 ) that has a plurality of protrusions ( 72 ) on one surface thereof, a plurality of electrodes ( 80 ) that are respectively provided on the plurality of protrusions ( 72 ) so as to be separated from each other, and a plurality of electrodes ( 82 ) that are provided on the other surface opposite to the one surface of the piezoelectric body ( 70 ) so that each of the electrodes faces only one electrode ( 80 ). Thus, it is possible to prevent variation in acoustic characteristics from occurring. Therefore, the oscillator capable of improving the acoustic characteristics of an electronic device is provided.

First claim

The invention claimed is:

1. An oscillator comprising:
a piezoelectric body that has a plurality of first protrusions on one surface thereof;
a plurality of first electrodes that are respectively provided on the plurality of first protrusions so as to be separated from each other;
a plurality of second electrodes that are provided on the other surface opposite to the one surface of the piezoelectric body so that each of the second electrodes faces only one first electrode; and
a plurality of second protrusions that are provided on the other surface of the piezoelectric body so that each of the second protrusions overlaps only one first protrusion when seen in a plan view,
wherein an entire periphery of each of the first protrusions is surrounded by grooves.

2. The oscillator according to claim 1 , further comprising:
a signal generating unit that is connected to each of the first electrodes and each of the second electrodes; and
a control unit that controls generation of a signal by the signal generating unit,
wherein the first electrode and the second electrode that face each other, and the piezoelectric body that is interposed between the first electrode and the second electrode constitute one piezoelectric vibrator, and
wherein the control unit controls the generation of the signal by the signal generating unit to independently control the output of a plurality of the piezoelectric vibrators.

3. An oscillator comprising:
a piezoelectric vibrator;
a vibration member that constrains the piezoelectric vibrator on one surface thereof, and wherein at least one end of the vibration member is bent inward toward one surface side of the piezoelectric vibrator or another surface side opposite to the one surface side; and
a supporting member that holds the end of the vibration member,
wherein the vibration member is bent at a bend portion, and
wherein the at least one end of the vibration member is located further inward toward the one surface side or the another surface side than the bend portion when seen in a plan view in a condition that a voltage is not applied to the piezoelectric vibrator.

4. The oscillator according to claim 3 , wherein the vibration member is bent toward one of the one surface side and the other surface side at one end thereof and the other end opposite to the one end.

5. An electronic device comprising:
a supporting member; and
a plurality of oscillators that are fixed onto the supporting member,
wherein the oscillator includes:
a piezoelectric vibrator; and
a vibration member that constrains the piezoelectric vibrator on one surface thereof, and wherein at least one end of the vibration member is bent toward one surface side of the piezoelectric vibrator or another surface side opposite to the one surface side and is held by the supporting member,
wherein the vibration member is bent at a bend portion, and
wherein the at least one end of the vibration member is located further inward toward the one surface side or the another surface side than the bend portion when seen in a plan view in condition that a voltage is not applied to the piezoelectric vibrator.

6. The electronic device according to claim 5 , wherein the plurality of oscillators are arranged on both surfaces of the supporting member.

Assignees

• Onishi Yasuharu
• Kuroda Jun
• Komoda Motoyoshi
• Kishinami Yuichiro
• Satou Shigeo
• Murata Yukio
• Kawashima Nobuhiro
• Uchikawa Tatsuya
• Nec Corp

Inventors

• Onishi Yasuharu
• Kuroda Jun
• Komoda Motoyoshi
• Kishinami Yuichiro
• Satou Shigeo
• Murata Yukio
• Kawashima Nobuhiro
• Uchikawa Tatsuya

Classifications

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title

• H04R2217/03

  Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves · CPC title

• H03B28/00 Primary

  Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations (analogue function generators for performing computing operations G06G7/26; use of transformers for conversion of waveform in AC-AC converters H02M5/18) · CPC title

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title