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Device and method for automatically controlling laser diode power

A technology of automatic power control and laser diode, which is applied in the direction of light control, non-electric variable control, optical recording/reproduction, etc., and can solve the problems of control speed and control range limitation

Inactive Publication Date: 2004-06-02
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the reproduction and recording speeds of media increase, the control speed and control range are limited by the operation speed of the up / down counter 153.

Method used

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  • Device and method for automatically controlling laser diode power
  • Device and method for automatically controlling laser diode power
  • Device and method for automatically controlling laser diode power

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Experimental program
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Embodiment Construction

[0045] The structure, operation and control method of the device for automatically controlling the power of a laser diode according to the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Such as figure 1 As shown, since the conventional apparatus for automatically controlling laser diode power uses an up / down counter in control performed by comparing a reference power level and feeding back a current power level, control speed and control range are limited.

[0047] Furthermore, when the recording speed of the medium increases, the shape of the recording pulse becomes complicated, and the width of the recording pulse becomes smaller.

[0048] An apparatus and method for automatically controlling the power of a laser diode is provided, including a method for sampling and holding an input signal at a desired location for a desired period of time.

[0049] figure 2 is a block functional block diagram showing the structu...

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Abstract

An optical recording / reproducing apparatus and a method therefor, and more particularly, an auto laser diode power controlling apparatus for controlling the power of a laser diode to be in an optimal state and a method therefor are provided. The auto laser diode power controlling apparatus for controlling the output of a laser diode by comparing the current power level of an optical signal output by the LD with a reference power level and controlling the output of the LD according to the comparison result comprises a photo detector (PD), a sampler / holder, a sampling and holding control signal generator, and an operator. It is possible to improve recording and reproducing performance since rapid change in an optical output is appropriately controlled using different loops according to the kind and state of the disc.

Description

technical field [0001] The present invention relates to a device for optical recording / reproduction and a method for optical recording / reproduction, more specifically, the present invention relates to a laser diode power automatic control device and control method for controlling the power of laser diodes The level is at its best. Background technique [0002] Modern society is often referred to as an information-oriented society or a multimedia society. In this society, a large-capacity recording medium is required. A magneto-optical disk drive (MODD) and a digital versatile disk random access memory (DVD-RAM), which are optical recording devices, are used as recording media. Since optical recording devices use laser diodes, the performance of these devices is determined by controlling the laser diodes which should be in an optimal state. Since the types of recording pulses required by individual optical recording apparatuses are different, it is necessary to perform eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/0045G11B7/125G11B7/126G11B7/1263G11B7/127H01S5/042H01S5/062H01S5/0683
CPCG11B7/0045G11B7/126G11B7/127G11B2007/0006H01S5/06835H01S5/042G11B7/1263
Inventor 徐赈教陈炅福高成鲁
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP