Title:
PICKUP SENSOR AND BONE-CONDUCTION SPEAKER
Document Type and Number:
WIPO Patent Application WO/2021/053883
Kind Code:
A1
Abstract:
According to the present invention, a diaphragm 15 is disposed on a yoke 3. A recess 19 is formed in the upper surface of the diaphragm 15. A first metal plate 17 is disposed in the recess 19. A permanent magnet 23 is disposed on the approximate center of the first metal plate 17. A second metal plate 25 is disposed on the permanent magnet 23. The sizes of the first metal plate 17 and the second metal plate 25 are greater than that of the permanent magnet 23. That is, with respect to the permanent magnet 23, the first metal plate 17 and the second metal plate 25 are disposed so as to protrude outward beyond the permanent magnet 23 in the longitudinal direction.
Inventors:
NAKATANI HIDENORI (JP)
SHA HATAAKI (JP)
SHA HATAAKI (JP)
Application Number:
PCT/JP2020/020039
Publication Date:
March 25, 2021
Filing Date:
May 21, 2020
Export Citation:
Assignee:
BOCO INC (JP)
GOLDENDANCE CO LTD (JP)
GOLDENDANCE CO LTD (JP)
International Classes:
H04R1/00; H04R11/00
Foreign References:
| JP2010010945A | 2010-01-14 | |||
| JP2007074693A | 2007-03-22 | |||
| JP2005323054A | 2005-11-17 | |||
| JP2015145850A | 2015-08-13 | |||
| JP2007074693A | 2007-03-22 |
Other References:
See also references of EP 4033774A4
Attorney, Agent or Firm:
INOUE, Seiichi (JP)
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