ELECTRONIC APPARATUS

• US 20130201796A1
• Filed: 09/09/2011
• Published: 08/08/2013
• Est. Priority Date: 11/01/2010
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC CASIO Mobile Communications Limited (NEC Corporation)
• Inventors: Onishi, Yasuharu, Kishinami, Yuichiro, Satou, Shigeo, Kuroda, Jun, Murata, Yukio, Komoda, Motoyoshi, Kawashima, Nobuhiro, Uchikawa, Tatsuya
• Application Number:
  US13/824,175
• Publication Number:
  US 20130201796A1
• Time in Patent Office: Days
• US Class Current: 367/99
• CPC Class Codes: G01S 15/08 Systems for measuring distance only indirect measurement G01S15/46
• CPC Class Codes: G01S 7/521 Constructional features
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 17/02 Microphones

Abstract

An electronic apparatus includes a substrate and an oscillation device (100) which is supported over the substrate, wherein the oscillation device (100) includes a piezoelectric element (110), a vibrating member (120) which binds one surface of the piezoelectric element (110), and a tubular support member (140) which supports an outer edge portion of the vibrating member (120) in an inner surface and is joined to the substrate so that an opening of one end side is closed by the substrate, and the support member (140) includes at least one hole (141) which connects a space, which is surrounded by the substrate and the vibrating member (120) in an inner portion of the support member (140), to an outer portion of the support member (140).

Claims

1. An electronic apparatus comprising:

a substrate; and

an oscillation device which is supported over the substrate,

wherein the oscillation device includes;

a piezoelectric element;

a vibrating member which binds one surface of the piezoelectric element; and

a tubular support member which supports an outer edge portion of the vibrating member in an inner surface and is joined to the substrate so that an opening of one end side is closed by the substrate, and

wherein the support member includes at least one hole which connects a space, which is surrounded by the substrate and the vibrating member in an inner portion of the support member, to an outer portion of the support member.

2. The electronic apparatus according to claim 1,

wherein the hole is configured by a concave portion which is provided in an end surface of the one end side of the support member.

3. The electronic apparatus according to claim 1,

wherein the support member includes a plurality of the holes which are disposed at equal intervals to each other.

4. The electronic apparatus according to claim 1

wherein an planar shape of the piezoelectric element is circular, and the support member is formed in a cylindrical shape.

5. The electronic apparatus according to claim 1,

wherein an planar shape of the piezoelectric element is rectangular, and the support member is formed in a rectangular square cylindrical shape.

6. The electronic apparatus according to claim 1,

wherein oscillating frequency of the piezoelectric element is equal to or more than 20 kHz.

7. The electronic apparatus according to claim 1,

wherein the piezoelectric element includes a laminated structure in which piezoelectric layers and electrode layers are alternately laminated.

8. The electronic apparatus according to claim 1,

wherein the piezoelectric element outputs ultrasonic waves which are modulated for a parametric speaker.

9. The electronic apparatus according to claim 1, further comprising:

an oscillation drive unit which makes the oscillation device output ultrasonic waves for a sensor;

a ultrasonic wave detection unit which detects the ultrasonic waves for the sensor reflected by an objected to be measured; and

a distance measurement unit which calculates a distance between the oscillation device and the object to be measured based on a time from when the ultrasonic waves for the sensor are output from the oscillation device until the ultrasonic waves for the sensor are detected by the ultrasonic wave detection unit.