| 摘要 |
PURPOSE:To simplify fabrication and adjustments, and also to improve fabrication precision by providing ring piezoelectric vibrators, by fixing them to a rotary cylinder at fixed diameter positions, and by fixing magnetic heads on right and left sides of a fixed diameter. CONSTITUTION:Two ring piezoelectric vibrators 1a and 1b differing in inner diameter are stuck each other being given polarization directions as shown by arrows. An arc disk cut off at its center is used to inverse right and left polarization directions. Vibrator 1 is fitted to rotary cylinder 5 via pedestal 6 by using fitting jigs 4 and 4'. Jigs 4 and 4' are positioned in contact with there polarization in direction. When a V signal is supplied by shorting the external electrode of vibrator 1, flexes in a S shape, so that magnetic heads 2 and 2' fitted to vibrator 1 will move as well. Changing a direct-current signal in polarity reverse the flection. For the purpose, the value of a signal equivalent to a shift in track of magnetic heads is inputted to a piezoelectric vibrator driver circuit, so that an extremely-excellent reproduced signal can be obtained. |
