Abstract
A speaker and a speaker apparatus used for acoustic sound reproduction include a magnetic circuit unit having a center plate of a magnetic material and a set of magnets arranged on both sides of the center plate with magnetic poles of repulsive polarities facing each other, a voice coil in which a magnetic field that is formed by the magnetic circuit unit is interlinked with at least a portion of an alternating magnetic field produced, a vibrating plate connected to the voice coil, and a set of resilient supporting members arranged plane-symmetrically with respect to the outer peripheral surface of the vibrating plate for movably supporting the outer periphery of the vibrating plate. The vibrating plate is movably supported by a set of resilient supporting members arranged plane-symmetrically to suppress the rolling of the vibrating plate during vibrations to realize stable vibrations of the vibrating plate.
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