Focusing deviation setting method of compact disk reading/memorizing system

Abstract

A disc reading / storing system focus warp enactment method includes: servo system which is adjusted and run tracking for running focus servo system to make reading focus error zero; the focus warp value of focus servo system is changed compulsively, the focus warp value which achieves minimum warp value is tracked and set as focus warp; corresponding with the set focus warp, the relative data gained after searching is read and affirms that whether is there error; if there is not error, the relative data is transmitted to main frame, if there is error, the focus error is zero, then corresponding with the focus error which is changed to zero, the position of data in disc is searched; the focus warp is recovered to initial focus warp and the data is reread. The invention improves the effect of reading by eliminating blight generated by focus warp and setting proper focus warp.

Description

technical field [0001] The present invention relates to a method for setting the focus deviation of an optical disc reading / storage system, especially by eliminating the adverse effects of the focus deviation during seek (seek), and setting a suitable focus deviation to improve the focus of the reading effect Deviation setting method. Background technique [0002] Since the development of a CD having a thickness of 1.2 mm and a diameter of 12 cm was started, many studies have been conducted to increase the storage density of the optical disc. At present, two phase substrates with a thickness of 0.6 mm and a diameter of 12 cm are basically bonded to an optical disc. Now, in order to improve the storage density of optical discs, there are DVD series with various structures (-5 / -9 / -10 / -18 types), one-time storage type DVD-R, rewritable DVD-RAM, etc. research has basically ended. In the future, composites (combo), multimedia, and super multimedia will be new research topics i...

AI Technical Summary

Problems solved by technology

Therefore, the reading effect of the middle or outer ring of the disc will be reduced.

[0033] Third, if the focus deviation is over-adjusted, factors such as scratches on the disc will cause the focus servo system to react abnormally

In this way, focus shadows (drops) are often generated, resulting in delays in data reading

[0034] Fourth, in the case of a large focus deviation, when the optical pickup moves to the position of the optical disc where the data is stored, the DC offset corresponding to the focus error will frequently induce focus shadows during the search (Seek) , resulting in a delay in data read

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