Title:
SOUND PRODUCTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/098181
Kind Code:
A1
Abstract:
This sound production device comprises: a vibration plate; an armature made of a magnetic material; a pair of magnets that face each other, sandwiching the armature, and form a prescribed gap therebetween; a yoke that supports the pair of magnets; a coil; and a transmission body that transmits the vibration of the armature to the vibration plate. The yoke has an accommodation unit in which a portion of the armature fits, in the direction where the prescribed gap was formed, and the armature is retained in the accommodation unit. Such a sound production device ensures stability in total harmonic distortion, enables reduction in the quantity of materials used for the armature, and allows for reduced device size.
Inventors:
NUMATA TAISHI (JP)
AOKI DAIGO (JP)
TSUCHIYA AKIHIRO (JP)
AOKI DAIGO (JP)
TSUCHIYA AKIHIRO (JP)
Application Number:
PCT/JP2018/041949
Publication Date:
May 23, 2019
Filing Date:
November 13, 2018
Export Citation:
Assignee:
ALPS ALPINE CO LTD (JP)
International Classes:
H04R11/02
Foreign References:
| JP2012501609A | 2012-01-19 | |||
| JP2017059988A | 2017-03-23 |
Attorney, Agent or Firm:
OKUBO, Katsuyuki (JP)
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