ELECTROACOUSTIC TRANSDUCER DEVICE

PROBLEM TO BE SOLVED: To secure required sound pressure when an electroacoustic transducer is used as a speaker on securing sufficient sound quality even when the electroacoustic transducer is used by both the speaker and a receiver in an electroacoustic transducer device. SOLUTION: An internal space of a housing 14 for housing the electroacoustic transducer 12 is partitioned into a front side space Cf and a rear side space Cr with a diaphragm 22 as a boundary, and the rear side space Cr is partitioned into a first space Cr1 facing rear sound emitting holes 14Bb and a second space Cr2 other than the first space Cr1. Sound emitted from front sound emitting holes 14Ab is used as sound of the speaker, and sound emitted from the rear sound emitting holes 14Bb is used as sound of the receiver. In such a case, the volume of the front side space Cf and the first space Cr1 is made small to secure sufficient sound quality as a speaker and a receiver due to the resonance effect of the spaces. Meanwhile, the volume of the second space Cr2 is made sufficient large to sufficiently absorb backpressure even though the amplitude of the diaphragm 22 becomes large, securing required sound pressure. COPYRIGHT: (C)2004,JPO&NCIPI