Focusing position adjusting method and system for optical head
A technology of focusing position and adjustment method, applied in the recording/reproducing, instrument, data recording and other directions by optical methods, can solve the problem of unstable programming quality, etc., and achieve the effect of solving the unstable programming quality
Inactive Publication Date: 2014-07-16
SUNPLUS TECH CO LTD
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[0005] 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
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[0039] 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:
[0040] Write RF=Write Power×R
[0041] 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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The invention provides a focusing position adjusting method and a focusing position adjusting system for an optical head. The optical head is positioned at a focusing position which is a certain distance away from an optical recording medium, and is used for transmitting a burning light beam with certain power to the optical recording medium so as to burn corresponding optical data onto the optical recording medium. The method comprises the following steps of: 1) performing burning on the optical recording medium by using the focusing position; 2) stopping burning and reading burnt data with reading power so as to generate a corresponding radio frequency signal; 3) acquiring a vibration amplitude absolute value by using the radio frequency signal; 4) changing the focusing position and repeating the step 1) so as to acquire a maximum vibration amplitude absolute value and a target focusing position corresponding to the maximum vibration amplitude absolute value; and 5) adjusting the optical head to the target focusing position so that the optical head can successively perform burning at the target focusing position on the optical recording medium, wherein the vibration amplitude absolute value is an I14 / I14H modulation value.
Description
[0001] This application is a divisional application of the application dated March 31, 2009, the application number is 200910129181.7, and the title of the invention is "A method and system for adjusting the focus position of an optical head". technical field [0002] 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 [0003] 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...
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IPC IPC(8): G11B7/095
Inventor 刘耀文蔡政修
Owner SUNPLUS TECH CO LTD