Patent ID: 6834744
Filing Date: 2004-12-28
Classification: H04M,H04R

Abstract:
A speaker system comprising:an enclosure having an enclosure acoustic aperture formed at a predetermined position, for outputting acoustic waves to the exterior, and at least one opening through which acoustic waves are output, formed at another position different from said predetermined position of said enclosure acoustic aperture; a diaphragm disposed within said enclosure at a position confronting said enclosure acoustic aperture, for allowing acoustic waves of positive phase generated forwardly as a result of oscillations to be output through said enclosure acoustic aperture; a diaphragm holding member for peripherally holding said diaphragm in a freely oscillatory manner; a plate-like member arranged confronting and apart from a rear surface of said diaphragm; a blocking member having at least one opposite-phase opening at a position remote from said at least one opening, said opposite-phase opening acting as an opening for outputting therethrough acoustic waves of opposite phase generated by said diaphragm, said blocking member blocking the output of acoustic waves between said plate-like member and said diaphragm holding member, excepting said at least one opposite-phase opening; wherein said blocking member encloses a space defining a rear air chamber between said plate-like member and said diaphragm holding member, and has a side wall contacting said plate-like member and said diaphragm holding member, said opposite phase opening formed in said side wall; said rear air chamber containing a magnet.