Outputting power method for controlling return circuit and optical read-write head by automatic power

A technology of automatic power control and optical read-write head, applied in the field of output power of optical read-write head, can solve the problem of too long time

Inactive Publication Date: 2006-04-19
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to disclose a method for switching two switches (Switch) in an automatic power control loop to quickly make the automatic power control loop reach a steady-state balance, so as to solve the above-mentioned known problems due to the unsteady balance state The problem caused by too long time, and use the open circuit to provide a preset driving voltage in the unsteady state, so as to meet the requirement of instantaneous switching of the output power of the read-write head

Method used

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  • Outputting power method for controlling return circuit and optical read-write head by automatic power
  • Outputting power method for controlling return circuit and optical read-write head by automatic power
  • Outputting power method for controlling return circuit and optical read-write head by automatic power

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Embodiment Construction

[0024] see image 3 , image 3 Represents an automatic power control circuit 30 of the present invention, which includes a detector 32 for detecting the output power of an optical read-write head 40 and generating a corresponding detection signal ε; a comparison circuit 34, which includes a first Input terminal, a second input terminal and an output terminal, the comparison circuit 34 is used to compare the two signals input from the first output terminal and the second input terminal to generate a corresponding comparison signal y, and the output terminal is used for to output the comparison signal y; a first switch 54, which is used to select one of the output signal from a power supply 52 and the detection signal ε of the detector 32 to input to the first input terminal of the comparison circuit 34; a first signal source 50, used to provide a first signal; a drive circuit 38, electrically connected to the optical head 40, used to drive the optical head 40; a second switch ...

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Abstract

The present invention is a method for controlling automatically the output power of an optical reading-writing head. The method comprises shifting a first switch to connect a first output end of a comparing circuit to a power supply and shifting a second switch to connect a first signal source with a driving circuit so as to make the driving circuit control the output power according to a first signal when the output power of the optical reading-writing head is changed; shifting the first switch to connect a first input end of the comparing circuit to a detector and shifting the second switch to connect the output end of the comparing circuit with the driving circuit so as to make the driving circuit control the output power according to a comparing signal when the potential difference between the first input end and the output end of the comparing circuit trends stable.

Description

technical field [0001] The invention provides a method for automatically controlling the output power, especially a method for automatically controlling the output power of an optical read-write head of an optical disk drive by using an automatic power control loop. Background technique [0002] In recent years, with the increasing computing power of computers and the continuous improvement of network technology, users use computers as multimedia audio-visual media and use computers as the starting point of communication with the virtual network world to access a large number of Internet networks. All kinds of information has become a trend. In this trend, due to the huge increase in the demand for data storage, various storage tools have also become popular products. Among them, the products using optical discs as storage media are cheap because the unit price of optical discs is the same under the same storage capacity. It is light, thin, does not take up space and is eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/1263
Inventor 廖学坤谢享季
Owner MEDIATEK INC
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