| 摘要 |
PURPOSE:To decrease the number of components and thereby to simplify its assembling and reduce cost of materials by constituting a fixed electrode with a ceiling of a metal case. CONSTITUTION:The titled microphone has no fixed electrode and the ceiling of the metal case 2 functions as the fixed electrode 2, and the vibrating film 4 is constituted on the side of a rear air chamber 11. The input reed 8a of an FET 8 is inserted between a film ring 3 and an insulating body 7, and continuity is made possible by contacting and the like. The number of parts of an amplifier block part is decreased to three from conventional four, therefore the total number of parts becomes eight from conventional nine. The film ring 3 and the metal case 2 need to be insulated from each other. In this connection, such a method exists that the film ring 3 is press-fitted in an insulating material 7 for positioning and fixing, however, this method parts to invite distortion in the vibrating film 4, so is not desirable one. Therefore, the desirable is that there is a small clearance between the film ring 3 and the insulating material 7. |
