Apparatus of compact disc

Abstract

The invention relates to a disc device, which is provided with a main shaft motor, a light collector, a sliding drive unit and a control unit. During tracking to the disc, the control unit carries out the following control: the sliding drive unit is controlled to drive the light collector to lead the light spot to radiate the neighboring of a target track of the disc; a motivating device of the light collector is controlled in virtue of an error tracking signal to lead the light spot radiated by an object lens to do tracking jump to the target track; beside, if the error tracking signal deviates a standard value, the tracking jump is not carried out in a divided zone corresponding to the position where the error tracking signal deviates the standard value. With the invention, quick tracking can also be realized even though the disc protection layer is thin and the face run-out is big.

Description

technical field [0001] The present invention relates to an optical disc device, in particular to an optical disc device capable of fast seeking. Background technique [0002] In conventional optical disc devices, such as figure 1 As shown, it usually includes: a spindle motor 1, the device motor 1 carries the optical disc 2, and drives the optical disc 2 to rotate in the plane of the optical disc; an optical pick-up 3, irradiates the light spot of the laser to the optical disc through the objective lens 4 described later, and receives the optical disc generated by the optical disc. 2 reflected laser light to generate a read signal; direction and the actuator 5 that moves in the radial direction of the optical disc 2; the sliding drive unit 6 drives the optical pick-up 3 to move in the radial direction of the optical disc; and the control unit 7 receives the read signal generated by the optical pick-up 3 The tracking error signal controls the actions of the slide drive unit...

AI Technical Summary

Problems solved by technology

At this time, if it is assumed that the light spot is currently located at a position 10 tracks away from the inner circumference of the optical disc of the target track, and the tracking jump is performed to the target track, then there is control unit 7 according to the following Figure 5a The tracking error signal shown in the figure controls the situation that the actuator drives the objective lens to seek the target track. In this case, the tracking error signal deviates from the reference value, and the resulting tracking skip pulse signal is as follows Figure 5b As shown, since the tracking jump pulse signal cannot obtain an accurate edge of the pulse signal after the deviation of the tracking error signal occurs, the counter cannot accurately count the track number of the tracking jump, so that the control unit 7 always controls the actuator 5 Make the objective lens 4 move toward the periphery of the disc

As a result, the path-seeking failed, and the above-mentioned path-seeking operation had to be performed again from the focus close action, which greatly reduced the speed of the path-seeking action.

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