Title:
SOUND PRODUCTION DEVICE
Document Type and Number:
Japanese Patent JP2017059987
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a sound production device capable of obtaining high output sound production, by reducing leakage magnetic flux from a magnetic field generation part.SOLUTION: A magnetic field generation unit 20 is attached to a drive side frame 5. The magnetic field generation unit 20 is constituted of an upper yoke 21 and a lower yoke 22 and side yokes 23, 23 formed of a fat plate material of cold rolled steel sheet. The side yokes 23, 23 are placed between the upper yoke 21 and lower yoke 22, with the upper end faces 23b, 23b being fixed to the opposite surface 21b of the upper yoke 21, and the lower end faces 23c, 23c being fixed to the opposite surface 22b of the lower yoke 22. An upper magnet 24 is fixed to the upper yoke 21, and a lower magnet 25 is fixed to the lower yoke 22. Leakage magnetic flux to the outside can be reduced, by forming each yoke with a cold rolled steel sheet.SELECTED DRAWING: Figure 4
Inventors:
NUMATA DAISHI
SATO YUTAKA
SATO KIYOSHI
SATO HIDEJI
SATO YUTAKA
SATO KIYOSHI
SATO HIDEJI
Application Number:
JP2015183072A
Publication Date:
March 23, 2017
Filing Date:
September 16, 2015
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD
International Classes:
H04R11/02
Domestic Patent References:
| JP2012004850A | 2012-01-05 | |||
| JP2009153032A | 2009-07-09 | |||
| JP2011029841A | 2011-02-10 | |||
| JPS5883897U | 1983-06-07 | |||
| JPS283052B1 | ||||
| JPS3517306Y1 | ||||
| JPH01100599U | 1989-07-06 |
Attorney, Agent or Firm:
野▲崎▼ 照夫
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo