| 摘要 |
PURPOSE:To improve product precision easily by sticking a couple of frame bodies to both plate surfaces of a diaphragm and using those frame bodies as spacers for specifying the gap size between a solid electrode and the diaphragm. CONSTITUTION:A couple of fixed electrodes 22a and 22b are arranged in a housing 21 at its upper part. Consequently, the diaphragm 24 having the surfaces made conductive is inserted and held between those electrodes 22a and 22b. This diaphragm 24 is formed by sticking frame bodies 25a and 25a' formed in the same shape to both plate surfaces oppositely and uniting the diaphragm 24 to the frame bodies 24a and 25a'. At this time, the thicknesses of the frame bodies 25a and 25a' are set so that the electrodes 22a and 22b, and diaphragm 24 have gaps A and B of desired size, and the frame bodies 25a and 25a' are used as the spacers. Consequently, the frame bodies 25a and 25a' are formed thinly enough for application to a microphone, so an electrostatic type push-pull microphone with high performance is realized. |
