Offset compensation method of laser power control circuit
A technology for controlling circuits and laser power, which is applied in the field of optical disc players, and can solve problems such as increased manufacturing and assembly man-hours, characteristic differences, and complex and difficult laser power control.
Inactive Publication Date: 2009-07-01
QUANTA STORAGE INC
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Problems solved by technology
[0004] However, the laser power control circuit and read head of the optical disc drive often have different characteristics due to differences in manufacturing process, precision and brand.
During assembly, it is necessary to adjust or take compensation measures to compensate for the offset between the laser power control circuit and the reading head, so that they can be used together. This not only increases the man-hours of manufacturing and assembly, but also makes the control of laser power more complicated and difficult.
Therefore, there are still problems to be solved urgently in the bias voltage compensation of the known optical disc player laser power automatic control circuit
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[0029] In order to achieve the above object, the present invention adopts the technical means and its effects, hereby give preferred embodiments, and illustrate as follows in conjunction with the accompanying drawings.
[0030] Please refer to figure 2 , is the laser power control circuit 20 of the present invention. The laser power control circuit 20 of the present invention includes a servo unit 21 , an offset adjustment unit 22 , a read head 23 , a laser diode 24 and a front monitoring device 25 . A servo unit 21 is mainly used to control the output of a voltage. After offset adjustment of the voltage through the offset adjustment unit 22, the voltage is transmitted to a read head 23, and the laser diode 24 in the read head 23 is turned on, and A beam of laser power is output, and there is a front monitoring device 25 in the read head 23 to monitor the state of the laser diode 24 at any time, and feed back the monitoring information to the servo unit 21 to adjust the outp...
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The invention relates to an offset compensation method of a laser power control circuit, which comprises the following steps: presetting a fixed parameter voltage, adjusting the offset voltage, adding the reference voltage on the offset voltage, outputting the voltage to a reading head to try to light the reading head, detecting the voltage of the reading head, continuously checking whether the detecting voltage rises to a specific threshold value, if the detecting voltage does not reach the specific threshold value, continuously adjusting the offset output voltage, if the voltage rises to the specific threshold value, recording the offset voltage when the voltage reaches the specific threshold value, then setting the offset voltage as the voltage offset compensation of the laser power control circuit for eliminating the characteristic differences of the reading head.
Description
technical field [0001] The invention relates to an optical disc drive, in particular to a laser power automatic control circuit in the optical disc drive, and a method for compensating the voltage offset generated by different read heads. Background technique [0002] The optical disc drive uses the laser diode in the read head as the light source, and uses the laser power control circuit to control the read head, so that the laser diode can output the laser power stably, so that the best beam can be projected to the disc to read, write or erase the data on the disc. data. [0003] Such as figure 1 Shown is a known CD player laser power control circuit 10 . The laser power control circuit 10 utilizes a servo unit 11 to control the output of a voltage, through the gain unit 12, after the voltage is adjusted by gain processing, the voltage is transmitted to a read head 13, and the laser diode 14 in the read head 13 is turned on , and output a beam of laser power. There is a...
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Inventor 徐嘉星萧亦隆
Owner QUANTA STORAGE INC