| 摘要 |
PURPOSE:To increase the characteristic of an electrostatic type pickup cartridge, by using an electret constituent uniform in the surface charge density. CONSTITUTION:A moving electrode 31 is supported near the base of a cantilever 34 supported freely shakingly via a suspension wire 32 and a damper 33 to the prescribed part of shell. A pair of electret constituents 25 are located as fixed electrodes 35a, 35b with a prescribed distance respectively at both sides of the moving electrode 31. |
