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US 2019/0182602 A1Published application
Sound-producing device
AssigneeAlps Alpine Co., Ltd.
InventorsTaishi NUMATA, Daigo AOKI, Kiyoshi SATO, Yutaka SATO
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Abstract
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.
Claims5
A sound-producing device comprising:
- a case, a yoke comprising 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,
- wherein, the yoke, magnet, coil, armature and vibrator are in the case, and the yoke comprises an Fe—Ni alloy containing approximately 32% by mass to 40% by mass of Ni.
Dependencies are inferred from the claim text.