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Automatic power control system and method for automatic power control of optical disk drive

A technology of automatic power control and CD-ROM, applied in the field of CD-ROM, can solve the problems of insufficient time, inability to be used as automatic power control, output signal convergence, etc.

Inactive Publication Date: 2011-12-14
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the front-end detection diode needs a period of time to produce a stable output signal, the output signal of the front-end detection diode cannot converge within a short period of time for each power, so it cannot be used as the basis for automatic power control
Therefore, Blu-ray discs include automatic power control zones to solve this problem, but the disc drive may not have enough time at the beginning of data writing to reach a stable writing power

Method used

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  • Automatic power control system and method for automatic power control of optical disk drive
  • Automatic power control system and method for automatic power control of optical disk drive
  • Automatic power control system and method for automatic power control of optical disk drive

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Embodiment Construction

[0083] The automatic power control system controls the power of the laser light emitted by the pickup head of the optical disc drive. Figure 4 It is a block diagram of an optical disc drive 400 including an automatic power control system 406 according to the present invention. In one embodiment, the optical disc drive 400 includes a front-end detection diode 410, an automatic power control system 406, a laser diode driver 416, and a laser diode 418. The laser diode driver 416 generates a driving current I according to a plurality of driving composition signals I1 to I4 and a plurality of driving enabling signals OE1 to OE4. The power of the laser will decrease with a variety of operating conditions, such as an increase in temperature or an increase in disc rotation speed. Therefore, the automatic power control system 406 performs an automatic power control procedure to adjust the driving current I of the laser diode 418 according to various operating conditions, so as to maint...

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Abstract

A method for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive is provided. On one embodiment, said optical disk drive is utilized for reading or writing data on an optical disk, the optical disk comprises a plurality of auto power control areas (APC areas) and a plurality of data areas, and the APC areas and the data areas are interleaved in between. First, in the APC areas, an initial driving signal is used to drive the optical pick-up head to emit laserbeam. A detected level of the laserbeam is then obtained. An update initial driving signal is then calibrated according to the detected level and a target level.

Description

Technical field [0001] The present invention relates to an optical disc drive, in particular to an automatic power control system and an automatic power control method of the optical disc drive. Background technique [0002] The optical disc drive uses a read head to project a laser onto the data layer of an optical disc to write data into or read data from the data layer. When the reading head emits a high-power laser, the laser melts the data layer of the optical disc or changes the phase of the data layer to mark the data pattern on it, thereby completing the burning of the data on the optical disc. When the reading head emits a low-power laser, the low-power laser cannot melt the data layer of the disc or change the phase of the data layer. At this time, the reading head decodes the data pattern according to the pattern of the laser light reflected from the disc so as to read the data from the optical disc. The reading head of the optical disc must therefore be able to gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/09G11B7/1263
Inventor 吴国辉蓝国荣林郁轩张又文
Owner MEDIATEK INC