| 摘要 |
PURPOSE:To suppress the resonance, by detecting the vibration of a moving part of an optical pickup, and feeding it back to a driving part. CONSTITUTION:As for 4 magnets, the same poles are opposed, and to the bobbin, 8 elliptical coils 21x, 21xc, 21y and 21yc are made to adhere in a state that their lengthwise directions have fallen at right angles with coils 21z, 21zc and also have been placed adjacently. Among 8 coils, the adjacent part of 4 coils is placed so as to be opposed to the magnet 5, and the adjacent part of other 4 coils is placed at a position separated from a magnetic path of the magnet 5. Accordingly, only a current flowing to the adjacent part side of the coils 21x, 21y contributes to movement of the moving part, a speed is detected by the coils 21xc, 21yc, and vibration in the (x) axis and the (y) axis is suppressed by the external circuit. Also, movement in the (z) axis is controlled by the coil 21z and the 21zc. |
