Title:
LOUDSPEAKER AND ACOUSTIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/031353
Kind Code:
A1
Abstract:
The present invention is provided with: a yoke (53); a magnet (52) fixed to the yoke (53); a plate (51) fixed to an end surface (52c) of the magnet (52), said end surface being on the reverse side of an end surface (52d) fixed to the yoke (53); a voice coil (40) disposed in a magnetic gap (54) formed between facing sections disposed facing each other, said facing sections being provided to the yoke (53) and the plate (51), respectively; a diaphragm (10) fixed to the voice coil (40); a supporting member (30) that supports the yoke (53) and the diaphragm (10); and a magnetic fluid (60) disposed between the voice coil (40) and the facing section of the plate (51). A coating film containing a fluorine resin is formed on the surface of a portion of the plate (51) and/or the voice coil (40), said portion being in contact with the magnetic fluid (60).
Inventors:
MATSUO YUJI
KOSUDA KAZUYUKI
KOBAYASHI YUICHI
MAKINO YASUHIRO
KOSUDA KAZUYUKI
KOBAYASHI YUICHI
MAKINO YASUHIRO
Application Number:
PCT/JP2018/028864
Publication Date:
February 14, 2019
Filing Date:
August 01, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H04R9/02; H04R1/02; H04R1/10; H04R9/04; H04R25/00
Domestic Patent References:
| WO2013114872A1 | 2013-08-08 | |||
| WO2016092782A1 | 2016-06-16 |
Foreign References:
| JPS61267499A | 1986-11-27 | |||
| JPS58106996A | 1983-06-25 | |||
| JPS5551599U | 1980-04-04 | |||
| JPS5899097A | 1983-06-13 | |||
| JP2013157735A | 2013-08-15 | |||
| JPS6021023B2 | 1985-05-24 |
Other References:
See also references of EP 3668114A4
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
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