KR20000041476A - Method for controlling track jump of optical disk system - Google Patents

Abstract

PURPOSE: A method for controlling a track jump of an optical disk system is provided to simplify an acting procedure for jumping a track to reduce time required to jump the track. CONSTITUTION: A method for controlling a track jump of an optical disk system includes eight steps. A first step is to judge whether a key signal for a track jump is inputted or not in a reproducing state. A second step is to detect the present track position and detect a distance between the detected track and an object track when the key signal is inputted. A third step is to judge whether an optical picking up unit(110) is arrived to the object track after transferring all of the optical picking up unit so as to correspond to the distance. A fourth step is to detect the present track position when the optical picking up unit is not arrived. A fifth step is to detect a track number remaining in between the present track position of the fourth step and the object track position. A sixth step is to drive a tracking actuator coil so as to correspond to the remaining track number. A seventh step is to judge whether the optical picking up unit is arrived to the object track or not according to the driving of the tracking actuator coil. A eighth step is to stop the driving of the actuator, feed back to the first step, and, repeatedly, perform the above steps when the optical picking unit is arrived.

Description

Track jump control method of optical disc system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc system, and more particularly, to a track jump control method of an optical disc system for controlling an optical pickup unit to accurately jump to a predetermined track position on a disc.

With the development of audio and video media, optical disc players that record and play back video and audio data on semi-permanent optical discs have higher signal-to-noise ratios than conventional video and / or audio playback devices, resulting in better image quality and / or sound quality. It is capable of playing back, no noise caused by irregular playback and modulation, very little distortion, no ghost and random access.

In other words, an optical disc system for non-contact reproduction of a bit signal recorded on a disc by a laser beam and digital signal processing can randomly depress the playback position on the disc, so that even when a track containing a predetermined song is reproduced, When a signal instructing playback of a song is input, the track may start and search for the start position of the track containing the song corresponding to the instruction signal.

Such a function is called a track search function, and a track search function will be described with reference to FIG.

An optical pickup unit that reads information on a disk by means of a laser beam and converts it into an electrical signal includes a disk 10 in which a predetermined sequence of information is recorded along a track of the laser beam collected by an objective lens (not shown). After radiating the light on the disk, the light reflected from the track of the disk 10 is received and converted into an electrical signal, thereby reading information recorded on the disk.

In reading out the information recorded on the disk, the disk 10 is substantially in a rotating state, and the optical pickup unit 20 is configured to trace the track of the rotating disk. In the figure, the error detection unit 30 generates and outputs a pulse corresponding to the optical pickup unit 20 when the optical pickup unit 20 crosses a track without tracing the track of the disk 10. The counter 40 counts the number of pulses output from the error detector 30 and provides it to the microcomputer 50, and the microcomputer 50 can know the crossing distance of the optical pickup unit 20 based on the count value. Therefore, even when the optical disc system is performing normal playback, when an instruction signal for jumping the optical pickup unit 20 to a predetermined position on the disc 10 is input, the microcomputer 50 controls the driver 60 to pick up the optical pickup. After the unit 20 is jumped to a predetermined position, the optical pickup unit 20 determines the jump position by referring to the count value generated in the process of traversing the track of the disk 10, and then the optical pickup unit 20 When the indicated predetermined position is reached, the track jump operation is completed.

At this time, the track jump operation counts the number of pulses along the track crossing and determines the jump position based on the count value. The track jump operation not only takes a lot of time according to the track jump operation but also confirms the track position after the track jump. The process according to the track jump operation was complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a track jump control apparatus of an optical disc system for shortening a track jump operation time to shorten a track jump operation time.

In order to achieve the above object, there is provided a track jump control method of an optical disc system in which an optical pickup unit having an objective lens and a tracking actuator coil therein, which optically picks up and outputs from a disc, jumps to a target track on the disc. A first step of determining whether a key signal for track jump is input in a reproducing state; A second step of detecting a distance from a target track by detecting a current track position when a key signal for the track jump is input as a result of the first step determination; A third step of determining whether the optical pickup unit has reached the target track after transferring the entire optical pickup unit to correspond to the distance between the current track and the target track detected in the second step; A fourth step of detecting a current track position if the optical pickup unit has not reached a target track as a result of the determination; A fifth step of detecting the remaining number of tracks from the current track position detected in the fourth step to a target track position; A sixth step of driving the tracking actuator coil to correspond to the remaining number of tracks detected in the fifth step; A seventh step of determining whether the optical pickup unit has reached the target track according to the driving of the tracking actuator coil; As a result of the seventh step, when the optical pickup unit reaches the target track, the optical pickup unit may include an eighth step of stopping the driving of the tracking actuator and returning to the first step to repeat the process.

1 is a block diagram of a track jumper using the optical pickup unit according to the prior art,

2 is a block diagram illustrating a track jump device of an optical disc system for performing a track jump control method according to the present invention;

3 is a detailed flowchart illustrating a process for performing a track jump control method of an optical disc system according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: disk 110: optical pickup unit

120: micom 130: feed servo unit

140: tracking servo unit 150: memory

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

2 is a block diagram showing the structure of a track jump control apparatus of an optical disc system for performing a track jump control method according to the present invention. The optical pickup unit 110, the microcomputer 120, the transfer servo unit 130, and the tracking are shown. It is composed of a servo unit 140 and a memory 150.

The optical pickup unit 110 detects the TOC (Table Of Contents) information of the disk 100 and the sub data included in the program data string from the disk 100 and provides it to the microcomputer 120.

At this time, the sub data is the data of the Q channel inserted in the program sequence recorded on the disc 100 at predetermined intervals, and represents the track number of the program currently being played, the time data corresponding to the current playback position on the disc 100, and the like. Therefore, when reading the time data of the Q channel, the position on the disc 100 of the program currently being played back can be known.

The microcomputer 120 is configured to control the overall operation of the optical disc system. When the key operation signal corresponding to the track jump is provided, the current track position detected by the sub data provided from the optical pickup unit 110 as described above. To jump to the target track position according to the distance from the current track to the target track when the key signal corresponding to the jump track stored in the memory 150 is input. A feed servo control signal and a tracking actuator drive signal according to the feed servo drive pulse value and tracking actuator coil drive current value are provided.

That is, the memory 150 stores the transfer servo drive pulse value and the tracking actuator coil drive current value according to the distance from the current track to the target track when the key signal corresponding to the jump track is input as described above. Read out at the request of 120 and provide it to the microcomputer 120.

The transfer servo unit 130 transfers the optical pickup unit 110 in accordance with the transfer servo control signal of the microcomputer 120, and the tracking servo unit 140 transmits the optical pickup unit in accordance with the tracking actuator drive signal of the microcomputer 120. The optical pickup unit 110 is driven by providing a current for driving the tracking actuator coil 110b of the 110.

3 is a flowchart illustrating a process for performing a track jump control method of an optical disc system according to the present invention, which will be described in detail with reference to the block diagram shown in FIG.

If the microcomputer 120 determines that a key signal for performing a track jump operation is input from the user in the playback mode (S100) (S101), the microcomputer 120 proceeds to S102 to sub-data provided from the optical pickup unit 110. The current track position is detected.

Next, the microcomputer 120 calculates the distance between the current track position detected in S102 and the target track input by the user (S103), and reads the feed servo pulse value corresponding to the calculated distance from the memory 150. After shipment, when the feed servo pulse value is provided to the feed servo unit 130 (S104), the feed servo unit 130 transfers the optical pickup unit 110 to correspond to the feed servo pulse value provided by the microcomputer 120. Let's do it.

Then, the microcomputer 120 determines whether the optical pickup unit 110 has reached the target track on the disc 100 in S105, and if the optical pickup unit 110 has reached the target track on the disc 100, the process proceeds to S110. If the optical pickup unit 110 does not reach the target track on the disc 100, the current track position is detected by the sub data provided from the optical pickup unit 110 (S106).

The microcomputer 120 detects the number of remaining tracks from the current track position detected in S106 to the target track (S107), and then stores the tracking actuator drive current value to correspond to the detected remaining track number. Read) and provide it to the tracking servo unit 140 (S108).

Accordingly, the tracking servo unit 140 drives the tracking actuator coil 110b of the optical pickup unit 110 by the tracking actuator drive current value provided by the microcomputer 120. At this time, the tracking actuator coil 110b adjusts the objective lens 110a so that the laser beam can accurately trace the disc 100 track. That is, since applying a current to the tracking actuator coil 110b is a result of applying a corresponding force, the optical pickup unit 110 is accelerated by its force to jump to the desired track.

Therefore, the microcomputer 120 determines whether the optical pickup unit 110 has reached the target track by driving the tracking actuator coil 110b in S109 to S108, and if the optical pickup unit 110b has reached the target track. The tracking servo unit 140 is controlled to stop driving the coil of the tracking actuator, and the process returns to S100 to repeat the above process.

As described above, the method according to the present invention detects the number of tracks remaining to the target track by first jumping the optical pickup unit by using the transfer servo to approach the target track, and moves the tracking actuator to correspond to the remaining track number. By driving the optical pickup unit to jump to the target track a second time, the track jump process can be simplified and accurately performed.

Claims (1)

In the track jump control method of an optical disc system having an objective lens and a tracking actuator coil inside to jump an optical pickup unit for optical pickup and output from the disc to a target track on the disc, A first step of determining whether a key signal for track jump is input in a reproducing state; A second step of detecting a distance from a target track by detecting a current track position when a key signal for the track jump is input as a result of the first step determination; A third step of determining whether the optical pickup unit has reached the target track after transferring the entire optical pickup unit to correspond to the distance between the current track and the target track detected in the second step; A fourth step of detecting a current track position if the optical pickup unit has not reached a target track as a result of the determination; A fifth step of detecting the remaining number of tracks from the current track position detected in the fourth step to a target track position; A sixth step of driving the tracking actuator coil to correspond to the remaining number of tracks detected in the fifth step; A seventh step of determining whether the optical pickup unit has reached the target track according to the driving of the tracking actuator coil; As a result of the seventh step, if the optical pickup unit reaches the target track, the track jump control of the optical disc system includes an eighth step of stopping the driving of the tracking actuator and returning to the first step to repeat the process. Way.