Patent ID: 8630439
Filing Date: 2014-01-14
Classification: H04R

Abstract:
1. An acoustic conversion device comprising: (a) a driving unit including a pair of magnets disposed so as to face one another, a yoke to which said pair of magnets are attached, a coil to which driving current is supplied, a vibrating portion which vibrates when driving current is supplied to said coil, and an armature fixed to said yoke and disposed between said pair of magnets with said vibrating portion being passed through said coil; (b) a diaphragm unit including a holding frame having an opening, fixed to said driving unit, with one face being taken as a first joint face to be jointed to said driving unit, and a face on the opposite side of said one face being taken as a second joint face, a resin film adhered to said holding frame in a state covering said opening of said holding frame, a diaphragm held on an inner side of said holding frame in a state adhered to said resin film, and a beam portion of which both edge portions are combined with said diaphragm and said vibrating portion of said armature respective, for propagating the vibration of said vibrating portion to said diaphragm; and (c) a storage unit having a case body and a cover body for storing said driving unit and said diaphragm unit, said storage unit having an audio output hole for outputting audio generated as vibrations are propagated to said diaphragm; wherein, in a state in which said driving unit and said diaphragm unit are inserted into said case body, said cover body is pressed against a sealing agent loaded in said second joint face of said holding frame from a side facing said second joint face such that said sealing agent is pressedly deformed, and a gap that is defined by said case body, said cover body, and said holding frame is sealed by said sealing agent.