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Method for judging regulation occasion of executing writing strategy by CD machine

A technology of optical disc drive and strategy, applied in the direction of optical recording/reproducing/erasing method, beam source, optical recording head, etc., can solve the problem of not setting temperature sensing element and so on

Inactive Publication Date: 2007-01-10
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in order to reduce the production cost of the optical disc drive, the optical read-write head of some specific optical disc drives is not provided with a temperature sensing element

Method used

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  • Method for judging regulation occasion of executing writing strategy by CD machine
  • Method for judging regulation occasion of executing writing strategy by CD machine
  • Method for judging regulation occasion of executing writing strategy by CD machine

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Embodiment Construction

[0038] Because the output power of the laser diode inside the optical disc drive is controlled by a digital control signal changed by the firmware. The digital control signal will generate an analog control signal after passing through a digital to analog circuit (Digital Analog Converter, DAC). Then, the compensator (Compensator) and the amplifier (Amplifier) ​​can generate a driving current to drive the laser diode to output a predetermined power. Of course, in order to maintain a constant power output of the laser diode, a front monitor diode (FMD) must be used to receive the laser beam output by the laser diode and generate a feedback signal to achieve the purpose of closed-loop control.

[0039] In general, the output power of a laser diode decreases as the internal temperature of the disc drive increases. Therefore, the output power of the laser diode inside the optical disc player is controlled in a closed loop, and the compensator can be used to change the output sign...

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Abstract

A method for judging regulation opportunity to execute writing in strategy of optical disc machine includes utilizing look up table stored in storage to record relationship of output signal figure to temperature, using output signal figure of compensator to look up internal temperature of optical disc machine and executing regular action of writing in strategy for optical disc machine while the internal temperature is greater than the specified temperature.

Description

technical field [0001] The invention relates to the control of the output power of the laser diode in the optical disc drive, and in particular to a method for judging when the optical disc drive executes writing strategy adjustment. Background technique [0002] The laser diode in the optical disc drive is arranged on the optical read-write head to be used as a light source for reading and writing the optical disc. However, when the optical disc drive performs the writing operation, the laser diode must continuously output high and stable power. Please refer to figure 1 , which is a schematic diagram of a closed-loop control loop of the laser diode output power inside the optical disc drive. Firstly, a digital-to-analog circuit (Digital Analog Converter, DAC) 10 receives a digital control signal 12 and converts it into an analog control signal 14, and subtracts the analog control signal 14 from the analog feedback signal 42 to generate an error signal 16 that is input to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/0045
Inventor 刘继元
Owner LITE ON IT