Title:
ELECTROACOUSTIC CONVERTER
Document Type and Number:
WIPO Patent Application WO/2021/060520
Kind Code:
A1
Abstract:
An electroacoustic converter 1 comprises: a coil 12 that is wound in a cylindrical shape; a vibration plate 10 that is connected to the coil 12; a magnet 20 that is disposed coaxially with the coil 12; an annular pole piece 21 that is connected to one pole of the magnet 20; a yoke 22 having a center pole 30 and a yoke bottom 31; and an acoustic resistor 6 that is constituted by a film disposed in a passage which establishes communication between an outside space and a space surrounded by the magnet 20, the pole piece 21, the yoke 22, and the vibration plate 10. The film which constitutes the acoustic resistor 6 has a plurality of through holes that penetrate through the film from the front to the back, and the plurality of through holes have the same hole diameter and are formed at equal intervals.
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Inventors:
MUTA YUSUKE (JP)
Application Number:
PCT/JP2020/036413
Publication Date:
April 01, 2021
Filing Date:
September 25, 2020
Export Citation:
Assignee:
FOSTER ELECTRIC CO LTD (JP)
International Classes:
H04R9/02
Foreign References:
| JP3217576U | 2018-08-16 | |||
| JPS6068186A | 1985-04-18 |
Attorney, Agent or Firm:
MAEKAWA Naoki et al. (JP)
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