| 摘要 |
PURPOSE:To increase the reproduction limit frequency at the high range as well as reduce the high frequency distortion of the cross modulation distortion , by using the plate-type armature having a small length/diameter ratio. CONSTITUTION:When stylus tip 1 stands still, armature 3 is at the neutral position. Thus the equal magnetic fluxes 17 and 17' flow to magnetic poles 5 and 5' from permanent 14 to cause no magnetic flux difference between coils 8 and 8'. Thus no output is caused at terminal 11. In case stylus tip 1 moves toward the arrow, armature 3 approximates to pole 5 to increase magnetic flux 17 flowing to pole 5 and decrease magnetic flux 17' flowing to pole 5' respectively. As a result, alternating magnetic flux 18 flows back, and the induced voltage of coils 8 and 8' receive the push-pull connection so that they may be added to each other. Thus output voltage 18' is caused at terminal 11. In such way, the output waveform can be obtained in accordance with the movement of stylus tip 1. |
