Optical microphone, has membrane with protuberance arranged between transmitter and receiver, which are arranged below membrane in such a way that axis of optical path of rays between transmitter and receiver is parallel to membrane axis

摘要

The microphone has a membrane (1) accommodated in a holder an including a protuberance (7) arranged between an optical transmitter (5) and an optical receiver. The transmitter and receiver are arranged below the membrane in such a way that the axis of the optical path of rays between the transmitter and receiver is parallel to the axis of the membrane. The protuberance is impermeable for the light emitted by the transmitter.