KR980011144A - Track jump control device of optical disc player - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for compensating for a track jump control signal of an optical disk player which recovers data recorded on an optical disk such as a CD (CD) or a digital versatile disk (DVD) or records data, When the tracking jump control signal is not detected normally due to a defect in the disk, there is a means for compensating the tracking jump control signal, and there is a defect that the track jumps more than one track or jumps less than the target track.

Accordingly, in order to solve the above problem, the present invention provides a tracking error signal generation device for generating a tracking error signal from an output signal of an optical pickup device; And track jump control means for counting the output time of the tracking error signal output from the tracking error signal generation means and compensating for the track jump control signal when the output time is not output within a predetermined time.

Description

Track jump control device of optical disc player

FIG. 1 is a block diagram of an embodiment of a control device for track jumping of an optical disk flare according to the present invention. FIG.

FIG. 2 is a waveform diagram showing a compensation example of a track jump control signal according to the present invention, in which (a) is a waveform diagram of a tracking error signal, (b) is a zero crossing detection waveform diagram of the tracking error signal, Driving voltage waveform diagram.

FIG. 3 is a flow chart of an operation signal of the track jump control device according to the present invention; FIG.

4 (a) and 4 (b) are waveform diagrams illustrating compensation of a track jump control signal according to the present invention;

FIG. 5 is a flow chart of the operation signal of the compensation example of the track jump control signal according to the present invention; FIG.

FIGS. 6A and 6B are waveform diagrams of another compensation example of the track jump control signal according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Disc 2: Optical pickup device

3: tracking error signal generation unit 4: track jump control unit

5: Kick drive part 6: Brake drive part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for compensating a track jump control signal of an optical disk player that reproduces data recorded on an optical disk such as a CD (Compact Disc) or a DVD (Digital Video Disc) And more particularly, to a track jump control apparatus for an optical disc player capable of artificially compensating for a track jump control signal or track information if the track jump control signal or track information is not normally detected due to defects of the disc, thereby allowing accurate jumping to the target track.

In general, when the optical disc player is to move from a track currently being reproduced to another track in the same disc, a track jump is performed. At first, a certain number of tracks are jumped and then a match with the target track is judged. The actuator is driven again to jump forward by one track or jump backward to find a desired track.

However, in general, in the optical disc player, there is a defect that the disc has no defect so that the tracking jump control signal is not normally detected, there is no means for compensating the defect, and the disc jumps one track more or less than the target track .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a track jump control method of an optical disc player which compensates a missing signal using a timer so that even if a tracking error signal is not normally detected due to a defect in the disc, Device.

According to an aspect of the present invention, there is provided an apparatus for controlling a track jump of an optical disc player, comprising: tracking error signal generating means for generating a tracking error signal from an output signal of the optical pickup apparatus; And a track jump control means for counting the output time of the output signal of the tracking error signal output from the tracking error signal generation means using a timer and compulsorily processing the track jump control signal when the output time is not output within a predetermined time, Respectively.

FIG. 1 is a block diagram of an embodiment of a track jump control device of an optical error disc player according to the present invention. As shown in FIG. 1, a laser beam is scanned on a disc 1, the reflected light is detected and converted into an electrical signal An optical pickup device 2; A tracking error signal generator 3 for detecting a tracking error signal TE from the output signal of the optical pickup device 2; A track jump control unit 4 for counting the output time of the tracking error signal output from the tracking error signal generation unit 3 and compulsorily processing the track jump control signal when the output time is not output within a predetermined time; A kick driving unit 5 which is controlled by the track jump control unit 4 to cause the optical pickup device 2 to jump to a target track to drive a coil of an actuator; And a brake driving unit 6 for controlling the actuator coil so as to stop the jumping operation of the optical pickup apparatus 2 under the control of the track jump control unit 4. The operation and effect of the present invention having the above- Will be described in detail with reference to FIGS. 2 to 6 attached hereto.

The optical pickup device 2 enters a laser at a designated position of the disc 1 to detect light reflected from the disc 1 and then outputs the laser to the disc 1, And the tracking error signal generator 3 detects and outputs the tracking error signal TE from the output signal of the optical pickup device 2. [

The track jump control unit 4 controls the kick driving unit 5 and the brake driving unit 56 based on the tracking error signal TE in order to jump accurately from the current track to the target track, So that the driving coil of the actuator is driven by the number of times.

However, when the tracking error signal is not detected at regular intervals due to physical damage of the disk 1 or other reasons, and the track jump control unit 4 is missing at the corresponding position as shown in FIG. 2 (a), the track jump control unit 4 uses an internal timer A normal jumping operation is performed. This will be described in detail with reference to FIGS. 2 and 3 and an example in which three tracks are jumped.

As shown in (A) of FIG. 2, once a normal tracking error signal TE of one cycle is inputted, its zero crossing is detected to generate a square wave TZC as shown in FIG. 2 (B) The kick driving unit 5 is driven for half a period of the tracking error signal TE and the brake driving unit 6 is driven for the remaining half period One track is jumped.

At this time, the track jump control unit 4 uses the internal counter to count the tracking error signal TE from the point of time when the first tracking error signal TE is input until the track jump control unit 4 reaches the predetermined timing (a) The control unit 5 generates the square wave TZC of the first period as shown in FIG. 2 (b), and outputs the square wave TZC of the kick drive unit 5 and the brake drive unit 5 as shown in FIG. (6) are driven to jump the two tracks. Thereafter, when the third tracking error signal TE is normally detected as in (A) of FIG. 2, the kick drive unit 5 and the brake drive unit 6 are driven as in the case of the first track jump, do.

FIG. 4 shows another compensation example according to the present invention. This compensation process will now be described with reference to FIG. 5.

When the tracking error signal TE is normally detected as shown in Fig. 4 (a) because there is no abnormality in the disk 1, a track which is positive (+) for half a period of the tracking error signal TE jumps ), And the brakes are applied for the remaining half period. In the next cycle, the kick and break operations are repeatedly performed a desired number of times to move to the target track.

However, when a part of the half cycle of the tracking error signal TE is abnormally detected as shown in (B) of Fig. 4 as an example when the disc 1 is defective and the tracking error signal TE is abnormally detected, The kick operation started in the first cycle is not performed for half a period but is continuous for half period (dotted line) of the next cycle, that is, for 1.5 cycles, so that the target track can not jump accurately.

In order to prevent this, once the kick operation is started, the track jump control unit 4 counts the time using an internal timer, and forcibly sets the kick time t (t) And performs a brake operation. Similarly, when the break time exceeds the reference time, the kick operation is performed during the half period (b) when the break time exceeds the reference time. Therefore, when a part of the tracking error signal TE is abnormally detected, the driving voltage DV as shown by the one-dot chain line in Fig. 4 (B) is outputted and it is possible to jump accurately to the target track

FIG. 6 shows another compensation example according to the present invention. The compensation process will be described below.

When the tracking error signal TE is normally detected as shown in (A) of FIG. 6 because there is no abnormality in the disk 1, the driving voltage DV is output as described above and the kick and break operations are repeatedly performed a desired number of times So that the user can move to the target track.

However, when the disc 1 is defective and the tracking error signal TE is abnormally detected as shown in (b) of FIG. 6, that is, when the disc is jumped by the desired number of tracks and the brake is applied, The brake operation is not terminated, and the brake operation continues to be continued, resulting in a large pushing of the track.

In order to prevent this, the break time b 'is counted as described above, and when the time exceeds the reference time, the level of the actuator driving voltage DV is raised to zero level so that the braking operation no longer continues.

As described in detail above, the present invention confirms whether or not a tracking error signal is normally detected using a timer, and compensates the track jump control signal when it is not normally detected, so that even if there is some defect in the disk, It has the effect of being able to jump accurately

Claims (4)

Tracking error signal generation means for generating a tracking error signal from an output signal of the optical pickup device; And track jump control means for counting the output time of the tracking error signal output from the tracking error signal generation means and compulsorily processing the track jump control signal when the output time is not output within a predetermined time. Track jump control device. The apparatus of claim 1, wherein the track jump control signal is a square wave generated by detecting a zero crossing of a tracking error signal. The track jump control apparatus as claimed in claim 1, wherein the track jump control signal is an actuator drive signal of the optical pickup device. The track jump control apparatus of an optical disc player according to claim 1, wherein the count time is based on a half cycle of the tracking error signal. ※ Note: It is disclosed by the contents of the first application.