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Focusing position adjusting method of optical head and system thereof

A technology of focus position and adjustment method, which is applied in the direction of optical recording/reproduction, instrumentation, data recording, etc., can solve problems such as unstable burning quality, and achieve the effect of solving unstable burning quality

Inactive Publication Date: 2011-06-01
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a method for adjusting the focus position of the optical head, which is used to adjust the focus position of the optical head during the burning process, so as to effectively solve the known problem of unstable burning quality

Method used

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  • Focusing position adjusting method of optical head and system thereof
  • Focusing position adjusting method of optical head and system thereof
  • Focusing position adjusting method of optical head and system thereof

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Embodiment Construction

[0040] Figure 2A It is a waveform diagram of a write radio frequency signal (Write Radio Frequency Signal, Write RF) according to the first embodiment of the present invention. Please refer to Figure 2A , this waveform is the waveform diagram used to generate blank (Space) blocks on the optical disc when the write power (Write Power) of the optical pickup head is fixed at the read power (Read Power) during burning. In optical disc technology, the definition of burning radio frequency signal is as follows:

[0041] Write RF=Write Power×R

[0042] Among them, R is reflectivity. At this time, the optical head is using the laser head to generate blank (Space) blocks on the optical disc with the read power, and the read power is relatively low, and during this period, the power is fixed. Therefore, the better the focus of the optical head, the lower the undershoot voltage of the waveform. Next, Figure 2B It is a flow chart of the method for adjusting the focus position acc...

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Abstract

The invention relates to a focusing position adjusting method of an optical head, wherein, the optical head is positioned at a focusing position which keeps a preset distance apart from an optical recording media for purpose of sending a burning light beam with preset power to the optical recording media and burning corresponding optical data on the optical recording media; and the focusing position adjusting method comprises the following steps: changing the focusing position of the optical head during the burning process so as to produce a corresponding burning radio-frequency signal; seeking out a minimum value of the burning radio-frequency signal and a corresponding target focusing position; and adjusting the optical head to the target focusing position so as to cause the optical head to burn the optical recording media at the target focusing position subsequently.

Description

technical field [0001] The invention relates to a method and system for adjusting the focus position of an optical head, in particular to a method and system for adjusting the focus position of an optical head for an optical recording / reading and writing device. Background technique [0002] In the prior art, when burning data on an optical recording medium, the optical head uses the focus position of the zero-crossing point of the focus error to perform burning. However, due to the unstable manufacturing process, the optical disk often has problems of tilt or unevenness. Therefore, the predetermined focus position is not necessarily the best focus position. The best focus position will change during the burning process. The optical head may be too close or too far away from the optical recording medium, resulting in unstable quality of the optical recording medium burned by the recording / reading and writing device, thereby affecting the quality of data read from the optica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/095
Inventor 刘耀文蔡政修
Owner SUNPLUS TECH CO LTD