| 摘要 |
PURPOSE:To stabilize the operation of a playback stylus by providing a means of performing vertical displacing drive following up fluctuations of the rotary surface of a recording disk and by fitting the base side of a cantilever to the means. CONSTITUTION:In a driving mechanism 7, a magnetic circuit is composed of a couple of annular yoke members 10 and 11 and an annular magnet 12 sandwiched between them. The yoke member 10 is fixed to a rotary cover 4 with screws, and a cylindrical body 13 is fitted in the center cylinder part of the yoke member 10, as shown by the arrow Y, smoothly movably without play; and a collar member 14 and a plate member 15 are fitted and fixed at the upper and lower parts respectively. Between the cylindrical body 13, and the yoke members 10 and 11, rubber films 16 and 17 are extended; and a cylindrical driving coil 18 is fixed to the cylindrical body 13, and the yoke members 10 and 11 are inserted into counter ring-shaped gate 19. Consequently, the cylindrical body 13 and the plate member 15 are displaced as shown by the arrow Y according to the magnitude and direction of a current supplied to the driving coil 18. |
