Method and apparatus of calibrating parameters of servo signals

Abstract

The invention relates to a method and apparatus of calibrating patameters utilized for determining servo signals. The method includes: (a) adjusting the parameter; (b) generating a first signal according to detecting signals outputted from one side of a photo detector; (c) generating a second signal according to detecting signals outputted from the other side of the photo detector; (d) generatingan index value according to the first and second signals; and (e) if a criterion for the index value is satisfied, utilizing the parameter corresponding to the index as an optimum parameter for the servo signal. To sum up, the optical disc drive and related servo parameter calibration method of the present invention greatly improve the recording quality and the recording performance.

Description

technical field [0001] The invention provides a method and device for calibrating servo signals, especially a method and device for calibrating the parameters of a servo signal of an optical drive. Background technique [0002] Optical storage media (such as a DVD disc) are currently very common storage media. see figure 1 , figure 1 It is a functional block diagram of the optical drive 100 in the prior art. The optical drive 100 (such as a DVD optical drive) has a read-write unit 110 for reading data on the optical disc 101 or burning data on the optical disc 101 . The reading and writing unit 110 includes a laser diode 112, which is used to emit a laser beam with a specific power on a track of the optical disc 101; and an optical sensor 114, which is used to detect the laser beam reflected by the optical disc 101 to generate a plurality of detection signals A, B, C and D. As known to those skilled in the art, the light sensor 114 generally has four sensing regions: 11...

AI Technical Summary

Problems solved by technology

like figure 1 As the laser power is increased for the laser diode shown in , the power of the reflected laser beam is also increased, which causes a shift in the optical path

like figure 2 As shown, when the laser power is increased, the center of the power distribution curve is moved from C to C', this action results in image 3 The laser spot 116 shown in , moves to the left on the optical sensor 114, and the movement of this laser spot will have a huge impact on the tracking servo control, and then endanger the quality of data access by the optical drive

[0006] The prior art optical drive 100 cannot compensate for the above-mentioned shortcomings of reducing the accuracy of servo control, so how to provide a method that can compensate for the above-mentioned shortcomings to improve the performance of the optical drive has become one of the most important issues in the manufacture of optical drives.

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