Title:
LOUDSPEAKER AND EARPHONES
Document Type and Number:
WIPO Patent Application WO/2019/031352
Kind Code:
A1
Abstract:
A loudspeaker (1) is provided with a magnetic circuit (50), a voice coil (40), a diaphragm (10), a housing, and a magnetic fluid (49) that is disposed between a plate (51) and the voice coil (40) in a magnetic gap (54). The magnetic circuit (50) is provided with a first flow channel (61) penetrating from the diaphragm (10) side to a rear surface, and the housing (30) is provided with a second flow channel (62) extending the first flow channel, and a third flow channel (63) penetrating from the diaphragm (10) side to the second flow channel (62). The ratio of a second area (S2) to a first area (S1) matches the ratio of an outer area (Se) to an inner area (Sb), i.e., a diaphragm (10) area corresponding to the inner side of the voice coil.
Inventors:
SAIKI SHUJI
MATSUO YUJI
KOSUDA KAZUYUKI
KOBAYASHI YUICHI
MAKINO YASUHIRO
MATSUO YUJI
KOSUDA KAZUYUKI
KOBAYASHI YUICHI
MAKINO YASUHIRO
Application Number:
PCT/JP2018/028854
Publication Date:
February 14, 2019
Filing Date:
August 01, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H04R1/10; H04R9/02
Domestic Patent References:
| WO2013153741A1 | 2013-10-17 |
Foreign References:
| JPH0614394A | 1994-01-21 | |||
| JP2010263362A | 2010-11-18 | |||
| JP2013157735A | 2013-08-15 |
Other References:
See also references of EP 3668113A4
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
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