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Method for controlling writng power in optical drive and its equipment

An optical drive, power technology, applied in the direction of recording/reproducing by optical methods, optical recording/reproducing/erasing methods, instruments, etc., can solve problems such as difficulty in obtaining writing characteristics, increase in jitter difference, etc.

Inactive Publication Date: 2002-09-04
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the difference in land jitter between the inner track and the outer track increases, making it difficult to obtain satisfactory writing characteristics

Method used

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  • Method for controlling writng power in optical drive and its equipment
  • Method for controlling writng power in optical drive and its equipment
  • Method for controlling writng power in optical drive and its equipment

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Embodiment Construction

[0020] refer to image 3 According to the present invention, an optical drive including a device for controlling writing power includes a controller 301, an automatic power controller (APC) 302, a laser diode (LD) driver 303, an LD 304, a beam splitter 305, an objective lens 306, such as a CD - Optical media 307 for R or CD-RW, photodiode 308 , monitor photodiode 309 , sample and hold units 310 and 311 , voltage gain amplifier 312 , and static random access memory (SRAM) 313 .

[0021] According to the present invention, when writing data to the optical medium 307 in the write mode in response to a user command, the controller 301 detects a normalized write radio frequency (RF) signal (denoted as WRF_Norm ), and output to APC302 the basic voltage level and compensation voltage level for controlling the writing power of LD304, so as to control the writing power of LD304 to the best, wherein, the compensation voltage level is due to the optimal power control of operation (OPC) ...

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Abstract

A write power control method and apparatus for performing operational optimal power control (OPC) in which a monitored write power and a write radio frequency (RF) signal that is difficult to compensate with hardware are compensated in firmware (or software) The imperfection of the dynamic range of the optical drive, and to obtain a normalized write RF signal with constant linearity when the optical drive is in the write mode, to control the write power of the laser diode, so that even when the write environment of the optical drive changes The best writing characteristics can still be obtained under this condition. The method includes the steps of: using a predetermined condition value to detect a first normalized write power having a linear characteristic relative to the write power, and setting the first normalized write signal as a reference signal; Inputting a second normalized write signal with a linear characteristic in power, while writing data into a user area on the optical medium; and determining whether the second normalized write signal is close to the first normalized write signal To control the write power of the light source.

Description

technical field [0001] The present invention relates to a method and device for controlling write power in an optical drive, and more particularly to such a write power control method and device for controlling the power to drive a laser diode (LD) in a write mode, so that even in Optimum write characteristics can still be obtained when the writing environment changes. Background technique [0002] In write mode, conventional optical drives employ a Power Calibration Area (PCA) on the optical media that controls the data on which data can be additionally written or rewritten, such as a compact disc recordable (CD-R) or rewritable The level of laser power (or write power) necessary to write data on an optical medium such as a compact disc (CD-RW). This control is called Optimal Power Control (OPC). [0003] Even if the optimum writing power is obtained by OPC, if the writing environment changes in the actual writing mode, satisfactory writing character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0045G11B7/125G11B7/1263G11B7/1267
CPCG11B7/00458G11B7/1263G11B7/1267G11B7/0045
Inventor 金周晔
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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