Title:
ACOUSTIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/075415
Kind Code:
A1
Abstract:
The present invention is an acoustic apparatus including: a cylindrical magnet 2; a bottom yoke 3 that adjoins one flat surface of the magnet 2; a pole piece 4 that adjoins a flat surface of the magnet on the side thereof facing the bottom yoke 3; and a ring yoke 5 positioned so as to surround the circumferential surface of the magnet 2. At least one of the bottom yoke 3, the pole piece 4, and the ring yoke 5 is a compression molded body obtained by compression molding a soft magnetic powder.
Inventors:
TERADA TAKAHIRO (JP)
WAKUI YUKIO (JP)
WAKUI YUKIO (JP)
Application Number:
PCT/JP2023/030057
Publication Date:
April 11, 2024
Filing Date:
August 21, 2023
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
H04R9/02
Domestic Patent References:
| WO2013140719A1 | 2013-09-26 | |||
| WO2014097632A1 | 2014-06-26 |
Foreign References:
| JP2022138013A | 2022-09-22 | |||
| JPH03220897A | 1991-09-30 |
Attorney, Agent or Firm:
IKEDA Yoshinori (JP)
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