PROBLEM TO BE SOLVED: To provide a hearing protection device capable of properly catching usual conversation sound while a big impact noise like shooting sound is blocked.SOLUTION: The hearing protection device of this invention includes a parallel flat condenser by opposite arrangement having a gap d between an electroconductive diaphragm 6 vibrating in response to sonic wave and a fixed electrode 4. The electroconductive diaphragm 6 vibrating in response to sonic wave transmits the receiving sound to an ear of a user A through a sound continuous hole 4a of the fixed electrode 4, and a wave detector 92 detects the wave when a microphone 8 picks up big sound, and direct-current voltage is supplied and applied between an electroconductive diaphragm 6 and the fixed electrode 4 and the electroconductive diaphragm 6 is absorbed to the fixed electrode 4 in order to inhibit the transmission of the impact sound. The user can properly catch the usual conversation sound while the big sound such as shooting sound itself is accurately blocked.COPYRIGHT: (C)2009,JPO&INPIT【課題】射撃音のような大きな衝撃音を遮断しつつ、通常の会話音等には適正に聞き取り可能な聴力保護具を提供する。【解決手段】本発明の聴力保護具は、音波を受けて振動する導電性振動板6と固定電極4との間隙dを有した対向配置により平行平板コンデンサを構成する。音波を受けて振動する導電性振動板6は、固定電極4の音連通孔4aを介してその受信音を利用者の耳Aに伝えるが、マイクロホン8が大音響を収音したときには、検波器92が検波し、その検波直流電圧を導電性振動板6と固定電極板4との間に供給印加するので導電性振動板6は固定電極板4に吸着され、衝撃音の伝達は阻止される。利用者は、射撃音のような大音響そのものを的確に遮断しつつ通常の話音を適切に聞き取ることができる。【選択図】図1
