Title:
SOUND PRODUCTION DEVICE
Document Type and Number:
Japanese Patent JP2017059986
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a sound generation device in which the gap of upper and lower magnets held in a magnetic field generation part can be set with high accuracy.SOLUTION: A magnetic field generation unit 20 is attached to the drive side attachment surface 5a of a drive side frame 5. The magnetic field generation unit 20 is constituted of an upper yoke 21, a lower yoke 22 and side yokes 23, 23 formed of a flat plate material of magnetic metal material. The side yokes 23, 23 are located between the upper yoke 21 and lower yoke 22, the upper end faces 23b, 23b are fixed to the opposite surface 21b of the upper yoke 21, and the lower end faces 23c, 23c are fixed to the opposite surface 22b of the lower yoke 22. By increasing the dimensional accuracy of the side yokes 23, 23, the gap δ of the upper magnet 24 fixed to the upper yoke 21 and the lower magnet 25 fixed to the lower yoke 22 can be set with high accuracy.SELECTED DRAWING: Figure 4
Inventors:
SATO HIDEJI
NUMATA DAISHI
SATO KIYOSHI
WATABE NAGISA
NUMATA DAISHI
SATO KIYOSHI
WATABE NAGISA
Application Number:
JP2015183068A
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 | |||
| JPH0272473U | 1990-06-01 | |||
| JPH0373099U | 1991-07-23 | |||
| JP2001245390A | 2001-09-07 | |||
| JP2014179948A | 2014-09-25 |
Attorney, Agent or Firm:
野▲崎▼ 照夫
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo
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