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Method and apparatus for controlling power of laser diode

A technology of laser diodes and lasers, which is applied to devices for controlling output parameters of lasers, optical recording/reproduction, lasers, etc., and can solve problems such as difficult recording and replaying results

Inactive Publication Date: 2004-06-16
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in figure 1 In the APC circuit 200, due to the continuous operation characteristic of the up / down counter 208, even in the valid data area of ​​the disk 180 the output of the LD 160 changes continuously with
Therefore, it is difficult to obtain accurate record playback results

Method used

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  • Method and apparatus for controlling power of laser diode
  • Method and apparatus for controlling power of laser diode
  • Method and apparatus for controlling power of laser diode

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Embodiment Construction

[0019] see figure 2 , which is a block diagram showing the configuration of a device for controlling the power supplied to a laser diode (hereinafter referred to as an automatic laser diode power control (APC) circuit), which performs the same figure 1 Parts with the same function as in figure 1 are denoted by the same symbols as in , and their descriptions are omitted. Reference numeral 300 denotes an APC controller and reference numeral 310 denotes a control signal generator.

[0020] The APC controller 300 controls the output of the DAC 210 according to the selected APC mode. In the present invention, the APC mode includes a sub-APC mode, an average APC mode and a sub-average APC mode. The sub-APC mode refers to a mode in which the APC is controlled in the non-data recording area of ​​the disc, and the control value is maintained until the next area of ​​the disc is reached. In digital versatile disk random access memory (DVD-RAM), the non-data recording area includes,...

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Abstract

A method and apparatus for controlling the power of a laser diode, which can prevent fluctuation in the laser power of the laser diode at a record / playback area of an optical disc. The apparatus for controlling the power of the laser diode includes a controller which controls an automatic power control of the laser diode (APC controller), interposed between an up / down counter and a laser diode driver, the APC controller latching the output of the up / down counter in synchronism with a periodic synchronization signal, and outputting the latch result to the laser diode driver. Therefore, the power level of the laser diode can be periodically controlled according to subdivided control modes, so that the laser power level remains resilient to external noise, compared to a continuous control operation through the entire mode.

Description

technical field [0001] The present invention relates to a method and device for controlling the power of a laser diode to an optimum level in an optical recording / reproducing device, and more particularly to a method and device for controlling the power of a laser diode to prevent Occurrence of laser diode power fluctuations. Background technique [0002] With the advent of multimedia, the demand for high-density recording media has increased. Such high-capacity recording media include a magneto-optical disk drive (MODD), a digital versatile disk read only memory (DVD-RAM) drive, a DVD random access memory (DVD-ROM), and the like. [0003] Such an optical recording apparatus must be optimized with high precision according to the type of optical recording medium used. To ensure accurate recording / playback of data, this optical recording device includes an automatic laser diode power control (APC) circuit for controlling the power applied to the laser diode (LD). [0004] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/094
CPCG11B7/126G11B7/1263H01S3/094
Inventor 徐赈教
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP