| 摘要 |
PURPOSE:To prevent erroneous sensing operation due to a sound otger than that of vibration or wind, etc., by placing the additional vibration surface of sound pressure of a microphone in a sealed gap. CONSTITUTION:A microphone 1 is provided with a shielding material 2 on a diaphragm 1a with a sealed gap 3 between. Said shielding material 2 prevents an air vibratory wave form entering the microphone 1 directly. According to vibration or the inclination of a body 4 whose vibration is to be detected, a ball 5a collides against or rolls on the internal circumferential wall surface of an auxiliary toll 5 constituted into a spherical surface to generate an impact or rolling sound, which is sensed by the diaphragm 1a of the microphone through the shielding material 2. |
