Unlock instant, AI-driven research and patent intelligence for your innovation.

Power controller and power control method for optical disc drive

A technology of optical disc drive and power control, applied in optical recording/reproduction, optical recording/reproduction/erasing methods, instruments, etc., which can solve the problems of increasing the time cost and money cost of disc drive manufacturers

Inactive Publication Date: 2008-02-27
SUNPLUS TECH CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, when using power feedback for closed-loop automatic power control, if the compensation is not good, the effect of closed-loop automatic power control will be worse than that of open-loop power control. The (off-line) power calibration increases the time cost and money cost of the disk drive manufacturer. Therefore, the present invention proposes a compensation method different from the previous proposal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power controller and power control method for optical disc drive
  • Power controller and power control method for optical disc drive
  • Power controller and power control method for optical disc drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] FIG. 6A illustrates a graph of the relationship among laser power, drive current and virtual power Pv.

[0044] Referring to FIG. 6A , since the material property of the laser diode 201 is to reduce its power as the temperature increases, the automatic power controller 207 increases the driving current to maintain a fixed laser power. Based on this characteristic, the present invention implements closed-loop automatic power control for bias power (recordable optical disc) or erasing power (rewritable optical disc). Once the temperature of the laser diode 201 rises, in the automatic power control mode (that is, after the automatic power controller 207 performs power compensation), the driving current corresponding to the bias power and the erasing power will also increase to maintain a fixed laser power. It is to move left and right on L1 or L2. The present invention feeds back the above-mentioned drive current, thereby knowing the temperature increase of the laser diod...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention discloses a kind of CD driver power control device and power control method. The CD driver power control device uses the characteristic of the laser diode to estimate the temperature effect degree, to control the part open-loop power, to gain the extract read-in power control. So, to the CD record media has high speed, high density, and which match multiple pulses read-in wave mode, even if the respond speed of the front light diode is slower than the laser diode, the invention also can arrive extract read-in power control.

Description

technical field [0001] The present invention relates to a power control device of an optical disk drive, in particular to a power control device and a power control method for controlling laser power by estimating the temperature rise effect of a laser diode. Background technique [0002] In current optical disc drives, laser diodes are usually used as light sources. In order to make the recorded optical discs have good consistency, the intensity of the laser power must be consistent. However, as shown in Figure 1, the optical power output of the laser diode will change with the change of the ambient temperature, that is, the higher the ambient temperature, the greater the current must be provided to maintain a consistent laser power. For example, when the power is kept at P value, different driving currents need to be provided under different ambient temperatures, such as T3>T2>T1, such as I3>I2>I1. Therefore, the optical disc drive needs an automatic power co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G11B7/125G11B7/0045G11B7/1263
Inventor 王信博曾律嘉张书鸣
Owner SUNPLUS TECH CO LTD