Patent ID: 8077885

Claim:
A microphone device, comprising: an enclosure having a bottom portion and a sidewall extending from the bottom portion, an opening being defined in the enclosure and opposite to the bottom portion; a nontransparent supporter enclosed in the enclosure and positioned on the bottom portion, a passage being defined in the supporter and having a first aperture and a second aperture at two opposite ends thereof, the first aperture being adjacent to the bottom portion; a light source positioned on the bottom portion, received in the passage and adjacent to the first aperture; an annular-shaped optical sensor positioned on the supporter and adjacent to the second aperture; a lens received in the optical sensor, positioned on the supporter and covering the second aperture; and a vibrating membrane having a peripheral portion and a reflective surface, the peripheral portion being supported on the sidewall such that the vibrating membrane seals the opening, the reflective surface being opposite to the lens and the optical sensor.