| 摘要 |
PURPOSE: An apparatus for automatically adjusting a sled hall voltage is provided for automatically adjusting an amplification voltage by detecting a hall sensor output voltage when the size of the output of a sled hall voltage of an optical disc drive is changed by a mechanical deviation or a hall sensor deviation. CONSTITUTION: A rotation circular plate is rotated, a hall voltage is generated in a hall sensor. The outputs of the hall sensors(1, 2) are inputted into an amplifier(5), and the amplified signal is inputted into a sub-feedback signal generator(6). An output signal outputted from the amplifier(5) is inputted into a microcomputer(7) for an analog-digital conversion. A difference between the maximum value and minimum value of an input sine wave is compared. If the value is different, the amplification ratio is not adjusted. However, if the value exceeds the set value or below the set value, the amplification ratio of the voltage automatic adjusting unit(9) is adjusted by varying the value of the output port of the microcomputer(7).
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