| 摘要 |
PURPOSE:To correct unbalance of an information carrier disc simply in a short time by using a laser beam so as to remove an outer ridge of a disc during rotation. CONSTITUTION:The optical disc comprising two discs 1(1a, 1b) adhered via a spacer 2(2a, 2b) is fixed to a spindle 4 and driven by a motor 5. An output 9 of the laser 10 is converted to the spacer 2 via an E/O modulator 8 and a lens 7. An output of a vibrating pickup 6 is fed to a peak detecting circuit 11, a minimum value of an output voltage is detected, a signal is fed to the modulator 8, the output of the laser 10 is increased, a part of the spacer 2 is removed so as to correct the unbalance of the disc. |
