Patent ID: 8416978
Filing Date: 2013-04-09
Classification: H04R

Abstract:
1. A vibration pickup microphone comprising: a housing provided with a first space with a hole and a second space to contain a microphone unit, the microphone unit contained in the second space having an air gap maintained by forming a stepped portion in a rear end portion of the second space; and an external diaphragm disposed over the hole of the first space, the external diaphragm configured to abut an external portion of a user's skin; wherein by disposing the external diaphragm over the hole of the first space, an air chamber formed in the first space and the air gap formed in the rear end portion of the second space are communicated via a thin passageway, the communication via the thin passageway of the air chamber and the air gap forms an acoustic circuit in a space extending from the external diaphragm to a diaphragm of the microphone unit to attenuate components of frequencies higher than voice frequencies; wherein a vibration of a voice picked up by the external diaphragm is transmitted to the diaphragm of the microphone unit as sound waves, the sound waves passing through the acoustic circuit composed of the air chamber, the thin passageway and air gap allow frequency components that are higher than voice frequencies are attenuated.