Patent ID: 8699745
Filing Date: 2014-04-15
Classification: H04R

Abstract:
1. A speaker, comprising: a housing having a box-like shape, and having a rectangular main surface having an opening; a diaphragm having almost a round, elliptical, or track shape and disposed so as to cover the main surface; a plurality of movable supports disposed in a region, of the main surface, which is not covered with the diaphragm, the plurality of movable supports configured to support an outer circumference of the diaphragm by joining the housing and the diaphragm such that the diaphragm is vibratable; a magnetic circuit, disposed in the housing, configured to have a magnetic gap; a voice coil having one portion inserted into the magnetic gap, and the other portion joined to the diaphragm; and a magnetic fluid filled in a gap between the voice coil and the magnetic circuit, the magnetic fluid preventing sound emitted from a rear surface of the diaphragm from leaking through the magnetic gap to the outside of the speaker, wherein there is no overlap between each of the movable supports and the diaphragm, the outer circumference of the diaphragm does not contact with any member in a region other than a portion, of the diaphragm, which is supported by the plurality of movable supports, and the plurality of movable supports each includes: