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Patent Searching and Data


Title:
SOUND GENERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/034016
Kind Code:
A1
Abstract:
[Problem] To provide a sound generation device having an armature inserted in a coil and facing a magnet, wherein a yoke is optimized, whereby it is possible to stabilize the acoustic pressure level at high frequencies. [Solution] A sound generation device in which a yoke formed of a magnetic material, a magnet supported by the yoke, a coil, an armature passing through the interior of the coil and facing the magnet, and a vibrating body that is caused to vibrate by the action of the armature are provided in a case, wherein the yoke is formed of an Fe-Ni alloy, the Ni being included in the range of 32-40 mass%. The level R1 of ripple noise at high frequencies can thereby be reduced.

Inventors:
NUMATA, Taishi (1-7, Yukigaya-otsukamachi, Ota-k, Tokyo 01, 〒1458501, JP)
AOKI, Daigo (1-7, Yukigaya-otsukamachi, Ota-k, Tokyo 01, 〒1458501, JP)
SATO, Kiyoshi (1-7, Yukigaya-otsukamachi, Ota-k, Tokyo 01, 〒1458501, JP)
SATO, Yutaka (1-7, Yukigaya-otsukamachi, Ota-k, Tokyo 01, 〒1458501, JP)
Application Number:
JP2017/008268
Publication Date:
February 22, 2018
Filing Date:
March 02, 2017
Export Citation:
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Assignee:
ALPS ELECTRIC CO., LTD. (1-7 Yukigaya-otsukamachi, Ota-ku Tokyo, 01, 〒1458501, JP)
International Classes:
H04R11/02
Foreign References:
JP2013138292A2013-07-11
US20140153749A12014-06-05
Attorney, Agent or Firm:
NOZAKI, Teruo (Oak Ikebukuro Building 3F, 1-21-11 Higashi-Ikebukuro Toshima-k, Tokyo 13, 〒1700013, JP)
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