Title:
PIEZOELECTRIC SPEAKER DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/049970
Kind Code:
A1
Abstract:
When a piezoelectric speaker is configured using piezoelectric film comprising an organic polymer, the piezoelectric constant of the organic polymer is comparatively small; therefore, in order to produce practical sound pressure, voltage in the range of tens or hundreds of volts must be applied. Meanwhile, if the piezoelectric speaker is touched with a hand or the like and damage is inflicted on the surface thereof, there is a risk that a drive electrode on which comparatively high voltage is being applied is exposed, and an electric shock accident is caused. An electrically insulating insulation layer (6) is formed on a user-side drive electrode (5) in a speaker body (2) provided in the piezoelectric speaker device, and a damage-detecting electrode wire (7) is formed on top of the insulation layer (6). When the damage-detecting electrode wire (7) verifies that damage has occurred, the drive voltage applied to the drive electrodes (4, 5) is lowered. To prevent an electric shock accident, it is preferable to lower the drive voltage to 42.4V, and more preferable to lower the same to 0V.
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Inventors:
ANDO MASAMICHI (JP)
Application Number:
PCT/JP2011/072198
Publication Date:
April 19, 2012
Filing Date:
September 28, 2011
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
ANDO MASAMICHI (JP)
ANDO MASAMICHI (JP)
International Classes:
H04R29/00; H04R17/00
Foreign References:
| JP2009278377A | 2009-11-26 | |||
| JP2006270663A | 2006-10-05 | |||
| JP2006339834A | 2006-12-14 | |||
| JP2006287480A | 2006-10-19 | |||
| JP2002027592A | 2002-01-25 |
Attorney, Agent or Firm:
KOSHIBA, MASAAKI (JP)
Masaaki Koshiba (JP)
Masaaki Koshiba (JP)
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Claims: