Title:
発音装置
Document Type and Number:
Japanese Patent JP6697145
Kind Code:
B2
Abstract:
[Object] To provide a sound-producing device that includes an armature inserted into a coil and facing a magnet and a yoke optimized to stabilize the sound pressure level at high frequencies.[Solution] A sound-producing device includes, in a case, a yoke formed of a magnetic material, a magnet supported by the yoke, a coil, an armature extending through the coil and facing the magnet, and a vibrator configured to vibrate in response to operation of the armature. The yoke is formed of an Fe-Ni alloy containing 32% by mass to 40% by mass of Ni. This allows for a reduction in ripple noise level R1 at high frequencies.
Inventors:
Tadashi Numata
Daigo Aoki
Kiyoshi Sato
Yutaka Sato
Daigo Aoki
Kiyoshi Sato
Yutaka Sato
Application Number:
JP2018534263A
Publication Date:
May 20, 2020
Filing Date:
March 02, 2017
Export Citation:
Assignee:
Alps Alpine Co., Ltd.
International Classes:
H04R11/02
Domestic Patent References:
| JP2013138292A | ||||
| JP2011174854A | ||||
| JP11233342A | ||||
| JP3277746A | ||||
| JP50023613B1 | ||||
| JP20124851A |
Attorney, Agent or Firm:
野▲崎▼ 照夫
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo
Iwao Hirayama
Masahiro Matsushita
Katsuyuki Okubo