SPEAKER - NEC CASIO MOBILE COMM LTD

Title:

SPEAKER

Document Type and Number:

WIPO Patent Application WO/2013/160975

Kind Code:

A1

Abstract:

[Problem] In a parametric speaker that uses ultrasonic waves as a carrier waves, to reduce the power consumption, and to make the oscillating elements resistant to damage when subjected to a shock due to being dropped or the like. [Solution] A plurality of magnetostrictive elements (2) comprising ferrite or the like are arranged in a matrix on the upper surface of a circuit substrate (1). A voice coil (3) is arranged around each of the magnetostrictive elements (2). When current flows to the voice coils (3), the magnetostrictive elements (2) expand and contract in the direction of the center axis thereof (height direction), whereby ultrasonic waves (carrier waves) are emitted into the air by the magnetostrictive elements (2). Due to the use of magnetostrictive elements (2) of ferrite or the like, the power consumption can be reduced in this case, as compared with cases in which piezoelectric oscillators are used, and the magnetostrictive elements (2) can be made resistant to damage when subjected to a shock due to being dropped or the like.

Inventors:

ONISHI YASUHARU (JP)
KURODA JUN (JP)
SATOU SHIGEO (JP)
KOMODA MOTOYOSHI (JP)

Application Number:

PCT/JP2012/007751

Publication Date:

October 31, 2013

Filing Date:

December 04, 2012

Export Citation:

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Assignee:

NEC CASIO MOBILE COMM LTD (JP)
ONISHI YASUHARU (JP)
KURODA JUN (JP)
SATOU SHIGEO (JP)
KOMODA MOTOYOSHI (JP)

International Classes:

H04R3/00; H04R1/40; H04R15/00

Foreign References:

JP2004297726A	2004-10-21
JP2006245731A	2006-09-14
JP2010051039A	2010-03-04
JP2012029102A	2012-02-09

Other References: