| 摘要 |
An unidirectional sound sensor is provided to have unidirectional characteristics to collect acoustic waves generated in one direction required by a user, by enabling a diaphragm in a condenser microphone to respond to the acoustic wave generated in the front. The unidirectional sound sensor includes a phase delay filter(111). A diaphragm, a space and an insulation ring are stacked on the bottom in a case. A back electret is inserted into the insulation ring. A printed circuit board is stacked on a metallic ring inserted onto the insulation ring. The phase delay filter is inserted into the insulation ring via the metallic ring. The phase delay filter has the thickness of 50-400 um and the void size of 0.025-15 um. |
