Title:
SPEAKER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/179616
Kind Code:
A1
Abstract:
A piezoelectric drive unit (10) has n (n is an integer of 2 or more) piezoelectric layers (3A to 3D) which are stacked with electrode layers (4B to 4D) interposed therebetween, wherein electrode layers (4A, 4E) are further formed on the bottom of the piezoelectric layer (3A) of the lowermost layer and on the top of the piezoelectric layer (3D) of the uppermost layer, the piezoelectric drive unit (10) bending and being displaced in the direction in which the piezoelectric layers are stacked. A signal conversion unit (11) converts an n-bit digital signal (IS) into n bits of a bit string data signal (BS) comprising bit data indicating the on and off state of a drive voltage that is applied to each of the piezoelectric layers (3A to 3D) via the electrode layers (4A to 4B). An output unit (12) outputs, in accordance with the value of each bit of the bit string data signal (BS) obtained by the conversion performed by the signal conversion unit (11), the drive voltage applied to each of the piezoelectric layers (3A to 3D).
Inventors:
OGATA KENJI (JP)
IKEDA YOSHIFUMI (JP)
KUROGI SHOGO (JP)
WATANABE YOSHIYUKI (JP)
IKEDA YOSHIFUMI (JP)
KUROGI SHOGO (JP)
WATANABE YOSHIYUKI (JP)
Application Number:
PCT/JP2017/014968
Publication Date:
October 19, 2017
Filing Date:
April 12, 2017
Export Citation:
Assignee:
DAI-ICHI SEIKO CO LTD (JP)
International Classes:
H04R3/00; H04R17/00
Foreign References:
| JP2011211725A | 2011-10-20 | |||
| JPS58202697A | 1983-11-25 | |||
| JP2015029313A | 2015-02-12 |
Attorney, Agent or Firm:
KIMURA Mitsuru (JP)
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