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US 7,068,807 B2Granted
Speaker device
AssigneeSony Corporation
InventorShinji Kobayashi
Life of this patent
Estimating the term…
Abstract
To realize a speaker device capable of significantly improving sound quality with a simple construction. The speaker device applies electromagnetic force to a voice coil based on a supplied audio signal, and generates a sound wave according to the audio signal by vibrating a vibratory plate fixed to the voice coil.
Claims1
A speaker device for applying electromagnetic force to a voice coil based on an audio signal supplied, and generating a sound wave according to the audio signal by vibrating a vibratory plate fixed to the voice coil, comprising:
- electromagnetic force generation means comprising:
- a pole piece placed at a center of a yoke;
- a first annular magnet fixed onto the yoke so as to surround the pole piece;
- an annular plate laminated on the first magnet, the annular plate comprising a top surface;
- and
- a second magnet of a prescribed thickness that is magnetized in an opposite direction to the first magnet and is laminated on the pole piece, wherein the second maanet extends at least partially above the top surface of the annular plate;
- wherein the voice coil is retained in a contactless manner in a magnetic gap formed between the plate, and the pole piece and the second magnet.
4 more elements
Dependencies are inferred from the claim text.