JP2001518675A - Method and apparatus for controlling track search in an optical disc system - Google Patents

Abstract

(57) [Summary] A method and apparatus for controlling a track search of an optical disk system for accurately performing a track search of an optical disk system are disclosed. The control unit of the optical disk system performs a general reproduction mode of the optical disk based on the first servo gain and the first servo offset value, and determines whether or not the current track and the target track are based on whether a track jump signal is input by the user. Calculating a track jump distance, detecting a second servo gain and a second servo offset value corresponding to the calculated track jump distance, performing a track jump of an optical pickup unit to a target track of the optical disc, Servo control of the optical disc is performed according to the second servo gain and the second servo offset value based on whether the jumped position of the optical pickup unit is the same as the target track position, and the second servo gain and the second servo gain are set. The servo control time using a servo offset value Performing servo control of the optical disk corresponding to and the first servo-off over the set value the first servo gain based on has been reached already time set.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk system, and more particularly, to a method for controlling a track search of an optical disk system that can reduce a track search time of the optical disk system and minimize a track search error. And the device.

2. Description of the Related Art Generally, optical disk players can be classified into compact disk players, laser disk players, compact disk graphic players, and video compact disk players according to their functions and applications.

[0003] Such an optical disc player can reproduce higher quality image and sound quality than conventional video and audio reproducing apparatuses, does not generate noise due to irregular reproduction and modulation, and enables random access of data. Therefore, it is increasingly used widely.

Also, unlike a video cassette recorder and a cassette recorder, an optical disc player can directly transfer an optical pickup unit for reproducing data recorded on an optical disc to a target track position in a short time.

FIG. 1 is a diagram conceptually showing a track jump position of an optical pickup unit on an optical disk.

Referring to FIG. 1, a system control unit (not shown) of an optical disc player performs a current track position (Th) at which a reproduction operation of an optical pickup unit is performed according to a target track setting signal input by a user. And target jump position (Tp
) And calculate the distance between them.

The system control unit controls an optical pickup transfer unit (not shown) based on the rotational acceleration corresponding to the calculated distance to transfer the optical pickup unit (not shown) to a target jump position (Tp). . A system controller controls the rotational acceleration according to a tracking error signal provided by a tracking error signal detector (not shown) to move the optical pick unit to a target jump position (Tp).
Transfer to Reference signs D, Th, Tp, Tp ', Tj1 and Tj2, and △
t1 and Δt2 represent an optical disk, a current track position, a target jump position, a target track position, an actual jump position, and a jump error value, respectively.

“Track jumping method for optical disk read head (TRACK
JUMPING METHOD FOR OPTICAL DISK READ
U.S. Patent No. 5,121,373 to Mark A. Barton et al., Entitled "ING HEAD", discloses a track jumping method that automatically compensates for position errors caused by the current jump.

However, according to the conventional track jump method described above, the optical pickup unit may not actually jump to the target position due to an over jump or an under jump. Even if the jump operation is completed, the optical disc player system is unstable due to the instantaneous flow of the optical pickup unit. As a result, it takes a long time for the optical pickup unit to perform a normal reproduction operation after performing a track jump. In addition, since the optical pickup unit performs the track jump without considering the characteristics of each optical disc, a precise track search cannot be performed.

[0010] DISCLOSURE OF INVENTION Accordingly, an object is to provide a method for controlling the optical disc to reduce track seek time of the system, track seeking in an optical disk system capable of minimizing the track seek errors of the invention .

Another object of the present invention is to provide an apparatus for controlling a track search of an optical disc system, which can reduce a track search time of the optical disc system and minimize a track search error.

In order to achieve the above object, the present invention provides two methods and two devices.

[0013] A first method for controlling a track search of an optical disc includes: (i) reading acceleration information of a currently loaded optical disc from an acceleration information storage area to reproduce a program stored on the optical disc; (Ii) performing a track jump for transferring a light beam to a target track based on the first acceleration information; and (iii) a first signal indicating a position of the target track to detect an error of the track jump. (Iv) comparing the acceleration information with the second signal representing the current jump track position, so as to reduce track jump errors during the next reproduction of the optical disc based on the comparison result. Updating as new acceleration information of the optical disc compensated by the error; and (v After the track jump, performing a precise search for the target track using the first signal and the error.

A second method for controlling a track search of an optical disc includes the following steps: (a) in a general reproduction mode using a first servo gain and a first servo offset value stored in a data storage area as servo control variables; (B) calculating a track jump distance between a target track designated by a user and a current track; and (c) a second servo gain corresponding to the track jump distance. Detecting a second servo offset value from the storage area; (d) performing a track jump of the optical pickup unit to a target track of the optical disc; and (e) determining a jump position of the optical pickup unit. The second servo gain and the second servo gain are set based on whether the target track is within an error limit range. And (f) when the servo control time in step (e) reaches a preset time, the first servo gain and the servo offset value. And performing servo control of the optical disc using the above.

[0015] A first device for controlling a track search of an optical disk includes: an optical pickup unit for reading data from the optical disk and outputting a data signal; processing the data signal into a digital signal; Reproducing means for outputting a reproduction position signal indicating a current reproduction position; focusing means for performing focusing servo of the optical pickup unit; tracking means for performing tracking servo of the optical pickup unit; and the optical pickup Transfer servo means for transferring the unit; storage means for storing a servo gain and a servo offset value corresponding to a track jump distance of the optical disc; and a first servo gain and a first servo off value from the storage means. The servo control unit controls the focusing servo unit and the tracking servo unit so that servo control of the optical disc is performed according to the first servo gain and the first servo offset value. Receiving a position signal, calculating a jump distance between a current reproduction track and a target track of the optical pickup unit according to a track jump signal input by a user's key selection, and calculating the jump distance calculated by the storage unit; Reading the second servo gain and the second servo offset value corresponding to the above, and controlling the transfer servo means so that the optical pickup unit jumps to the target track based on the second servo gain and the second servo offset value. Controlling the second servo gain for a preset time. And controlling the focusing servo means and the tracking servo means so that servo control of the optical disc is performed according to a second servo offset value, and when a preset time is exceeded, the first servo gain and the first servo gain are controlled. Control means for controlling the focusing servo means and the tracking servo means so that servo control of the optical disc is performed in accordance with an offset value;

A second device for controlling a track search of the optical disk includes: an optical pickup unit configured to irradiate the optical disk with a laser beam, convert light reflected from the optical disk into an electrical signal, and output the electrical signal; A tracking error signal generating means for outputting a tracking error signal indicating whether or not the laser beam is accurately applied to the center of the track of the optical disc based on the electric signal from the optical pickup unit; An inverting / non-inverting means for inverting or non-inverting the tracking error signal from the signal generating means; and a peak value of the tracking error signal by holding a peak value of the tracking error signal from the inverting / non-inverting means. Peak holding means for outputting a signal; A reference level generating means for outputting a reference level signal corresponding to the peak value signal from the peak holding signal; a level of the tracking error signal from the inverting / non-inverting means; First comparing means for comparing the level of a reference level signal and generating a first clock signal each time the level of the tracking error signal matches the level of the reference level signal; A jump state detecting means for comparing the tracking error signal with a previously set comparison level signal and outputting a track jump state signal indicating a track jump state, and providing a drive signal to the optical pickup unit, Driving means for causing the optical pickup unit to jump a track; A jump signal generating unit for providing a jump completion signal to the jump state detecting unit when the track jump of the optical pickup unit is completed by providing a jump signal and operating the driving unit; and the tracking error signal. Storage means for storing an acceleration time standard value and a deceleration time standard value representing a peak value of the reference level and a level ratio of the reference level; and a track jump state signal from the jump state detecting means; Control means for controlling the jump signal generating means for controlling a track jump of the optical pickup unit according to the first clock signal from the comparing means and the standard value signal from the storage means;

In the method and apparatus for controlling a track search of an optical disc system according to the present invention, the optical disc system can minimize a jump error such as an over jump or an under jump of the optical pickup unit, and Unstable regeneration operation due to momentary shaking can be prevented. Furthermore, after the track jump operation of the optical pickup unit is performed, the delay time required for the optical disk system to perform the normal reproduction operation of the optical disk can be reduced. Therefore, the optical disk system can perform a precise and stable track search.

[0018] Embodiment of the invention will now be described the structure and operation of a method and apparatus for controlling a track search of an optical disk system according to an embodiment of the present invention with reference to the drawings.

[0019] First Embodiment FIG. 2 is a block diagram for showing a circuit configuration of a device for controlling a track search of an optical disc system according to a first embodiment of the present invention. As shown in FIG. 2, the apparatus for controlling the track search of the optical disk system according to the first embodiment of the present invention includes a key input unit 10 for generating a key signal corresponding to a key operation by a user.
A system control unit 20 for controlling the operation of the optical disk system in accordance with a key signal from the key input unit 10 and a signal from a component of the optical disk reproducing unit 40
And a storage unit 30 for storing acceleration information corresponding to a track distance between tracks of the optical disk, a unique number of the optical disk, and corrected acceleration information corresponding to the unique number. The optical disc reproducing unit 40 irradiates a laser beam to the optical disc, converts an optical beam reflected from the optical disc into an electric signal, and outputs the electric signal. The electric signal from the optical pickup unit 41 is provided. A tracking error signal detection unit 42 for outputting a tracking error signal indicating whether or not the laser beam is accurately applied to the center of the track of the optical disk based on the laser beam. A tracking servo control unit 43 for controlling to be traced, a motor drive unit 44 for outputting an optical pickup transfer signal in accordance with a control signal from the system control unit 20, and light from the motor drive unit 44 The optical pickup unit 41 is transferred according to a pickup transfer signal. Having order of the optical pickup feed motor 45.

When a search key signal is input from the key input unit 10 while the optical disk reproducing unit 40 operates, the system control unit 20 stops the operation of the optical disk reproducing unit 40. When a target track position signal representing a target track is input from the key input unit 10 by a user operation, the system control unit 20 reads acceleration information corresponding to the unique number of the optical disc D from the storage unit 30, The motor drive unit 44 and the optical pickup transfer motor 45 are controlled based on the read acceleration information to transfer the optical pickup unit 41 to the target track.

The system control unit 20 monitors a track jump position of the optical pickup unit 41 according to a tracking error signal from the tracking error signal detection unit 42, and determines a jump position of the optical pickup unit 41 and the target track. The acceleration information is corrected by detecting a distance error value from the position. The corrected acceleration information is stored in the storage unit 30 together with a unique number of the optical disc.

FIG. 3 is a flowchart illustrating a method for controlling a track search of an optical disc system using the apparatus shown in FIG. As shown in FIG. 3, when the optical disc D is loaded (step S100), the optical disc reproducing unit 40 transmits a content table (hereinafter referred to as a “load-in” section) assigned to the load-in section of the optical disc D. , TOC) area is read and provided to the system control unit 20. The system control unit 20 stores the TOC information in a memory field (not shown) provided in the system control unit 20 or the storage unit 30 (step S102). At this time, the TOC information includes position information of each track of the optical disc D and unique information. The unique number of the optical disc D is the absolute time of the optical disc D read from the TOC information.

In step S104, while the general playback mode of the optical disc D is being performed, if the search key signal is input from the key input unit 10 by the user (step S106), the system control unit 20 Operates in a standby mode so that the user sets a target jump position. When a target jump position signal is input from the key input unit 10 by the user's operation (step S108), the system control unit 20 stores the corrected acceleration information corresponding to the unique number of the loaded optical disk in the storage unit. 30 is searched for (step S110).

In step S110, if there is no corrected acceleration information corresponding to the unique number of the loaded optical disc D, the system control unit 20 reads the already set standard acceleration information (step S112). If the corrected acceleration information corresponding to the unique number of the loaded optical disc D exists in step S110, the system control unit 20 reads the corrected acceleration information corresponding to the loaded optical disc D (step S114). The system control unit 20 controls the motor drive unit 44 and the optical pickup transfer motor 45 based on the standard acceleration information or the corrected acceleration information to move the optical pickup unit 41 adjacent to the target jump position Tp. The target is moved to the target track position Tp '(step S116). At this time, the target track position Tp 'is detected by the TOC information read in step S102, and is the position of the track closest to the target jump position Tp.

In step S 118, the system control unit 20 detects a current jump position Tj 1 of the optical pickup unit 41 and compares the current jump position Tj 1 with the target track position Tp ′. If the current jump position Tj1 and the target track position Tp 'are the same, the system control unit 20 calculates the absolute time of the optical disk D read in step S102 and the acceleration information used in step S116. Store in the storage unit 30 (
Step S122). If the current jump position Tj1 and the target track position Tp 'are not the same, the system control unit 20 calculates a distance error value Δt between the current jump position Tj1 and the target track position Tp', The calculated distance error value △
t, and the acceleration information used in step S116 is reset (step S120).
). The system control unit 20 transmits the reset acceleration information to the optical disc D.
(Step S122).

When the objective lens of the optical pickup unit 41 is stabilized, the system control unit 20 moves the objective lens to the target jump position at the current jump position Tj1, and controls the tracking servo control unit 43. . Further, the optical pickup unit 41 controls the target jump position Tp according to the control of the servo control unit 43.
Is searched precisely (step S124).

Second Embodiment As shown in FIG. 4, an apparatus for controlling a track search in an optical disk system according to a second embodiment of the present invention includes an optical pickup unit 200, a focusing servo unit 202, and a tracking servo unit 204. , A transfer servo unit 206, a reproduction unit 208, a control unit 210, and a storage unit 212.

The optical pickup unit 200 reads data from the optical disc D and outputs a data signal. The focusing servo unit 202 performs focusing servo of the optical pickup unit 200 based on a focusing gain and a focusing offset value. The tracking servo unit 204 performs tracking servo of the optical pickup unit based on a tracking gain and a tracking offset value. The transfer servo unit 206 transfers the optical pickup unit 200. The reproducing unit 208 processes the data signal from the optical pickup unit 200 into a digital signal and outputs a reproduction position signal indicating the current reproduction position of the optical pickup unit 200. The storage unit 212 stores a servo gain and a servo offset value corresponding to a jump distance of each track of the optical disc D. The control unit 210 detects a first servo gain and a first servo offset value from the storage unit 212 so that servo control of the optical disc D is performed according to the first servo gain and the first servo offset value. The focusing servo unit 202 and the tracking servo unit 204 are controlled.

The control unit 210 may jump between the current playback track and the target track of the optical pickup unit 200 according to the playback position signal and the track jump signal input from the playback unit 208 and a user, respectively. Calculate the distance,
A second servo gain and a second servo offset value corresponding to the calculated jump distance are read from the storage unit 212. Also, the controller 210 controls the transfer servo unit 206 based on the second servo gain and the second servo offset value so that the optical pickup unit 200 jumps to a target track. The controller 210 may control the second servo gain and the second servo gain during a preset time.
The focusing servo unit 202 and the tracking servo unit 204 are controlled so that the servo control of the optical disc D is performed according to the servo offset value.

On the other hand, when the preset time is exceeded, the control unit 210 controls the focusing servo unit so that the servo control of the optical disc D is performed according to the first servo gain and the first servo offset value. 202 and the tracking servo unit 204 are controlled.

FIG. 5 is a flowchart illustrating a method for controlling a track search of an optical disk system using the apparatus shown in FIG. As shown in FIG. 5, when the optical disk D is loaded, the control unit 210
Reads a first servo gain and a first servo offset value from the storage unit 212, and the focusing servo unit 202 and the tracking servo unit 204 read the first servo gain and the first servo offset value based on the first servo gain and the first servo offset value. Optical disk D
Is performed (step S300).

In step S 302, when a track jump signal is input from the outside by the user, the control unit 210 moves between the current track based on the playback position signal from the playback unit 208 and the target track based on the track jump signal. Calculate the distance of (
Step S304).

The control unit 210 reads a second servo gain and a second servo offset value corresponding to the distance calculated in step S304 from the storage unit 212 (step S306).
), A track jump of the optical pickup unit 200 is performed based on the calculated distance (step S308). When the optical pickup unit 200 reaches the target track (step S3).
10) The controller 210 controls the transfer servo unit 206 to stop the track jump of the optical pickup unit 200. The focusing servo unit 202 and the tracking servo unit 204 perform focusing of the optical pickup unit 200 corresponding to the second servo gain and the second servo offset value read in step S306 according to the control of the control unit 210. The servo and the tracking servo are performed (step S312).

On the other hand, the focusing servo unit 202 and the tracking servo unit 204
Operates, the optical pickup unit 200 reads data from the optical disc D and provides it to the reproducing unit 208, thereby starting reproduction of the optical disc D.

When the reproduction time T using the second servo gain and the second servo offset value reaches a preset time t 1 (step S 314), the control unit 210 controls the focusing servo unit 202 and the tracking servo. The focusing servo unit 202 and the tracking servo unit 204 are controlled so that the unit 204 performs a servo operation based on the first servo gain and the first servo offset value.

Third Embodiment Referring to FIG. 6, an apparatus for controlling a track search in an optical disk system according to a third embodiment of the present invention includes an optical pickup unit 400, a tracking error signal generating section 410, a phase compensating section 420, an inverting section. / Non-inverting section 430, peak holding section 4
40, reference level signal generator 450, first comparator 460, jump signal generator 4
70, a switching unit 480, a control unit 490, a driving unit 500, a jump state detection unit 510, and a storage unit 520.

The optical pickup unit 400 irradiates the optical disc D with a laser beam,
The light reflected from the optical disk is converted into an electric signal and output.

The tracking error signal generating section 410 is provided with the optical pickup unit 40.
And outputting a tracking error signal indicating whether the laser beam is accurately applied to the center of the track of the optical disk based on the electrical signal from 0. Also, when the optical pickup unit 400 crosses the track of the optical disc D, the tracking error generator 410 generates a tracking error signal in the form of a sine wave.

The inversion / non-inversion unit 430 always increases the error amount on the plus (+) side first regardless of the track jump direction of the optical pickup unit 400 according to the control signal from the control unit 210. For this purpose, the tracking error signal from the tracking error signal generator 410 is inverted or non-inverted to output an inverted signal or a non-inverted signal of the tracking error signal.
At this time, the first jump direction of the optical pickup unit 400 is advanced toward the outer radius side on the inner radius side of the optical disc D, and the second jump direction of the optical pickup unit 400 is set to the inner radius side on the outer radius side of the optical disc D. Proceed to the side. That is,
When the optical pickup unit 400 jumps in the first jump direction, the inversion / non-inversion unit 430 non-inverts the tracking error signal. When the optical pickup unit 400 jumps in the second jump direction, the inversion / non-inversion. The unit 430 inverts the tracking error signal.

The peak holding unit 440 holds the peak value of the tracking signal from the inverting / non-inverting unit 430 and provides the peak value of the tracking error signal to the reference level signal generating unit 450.

The reference level signal generating section 450 outputs a reference level signal corresponding to the peak value signal from the peak holding section 440 according to a control signal from the control section 490.

The first comparing section 460 compares the level of the tracking error signal from the inverting / non-inverting section 430 with the level of the reference level signal from the reference level signal generating section 450. The first comparing unit 460 generates a high-level first clock signal every time the level of the tracking error signal falls below the peak value and matches the level of the reference level signal, and provides the first clock signal to the control unit 490. .

The control unit 490 determines the acceleration and deceleration times of the track jump of the optical pickup unit 400 based on the first clock signal from the first comparison unit 460, and corresponds to the determined acceleration and deceleration times. The jump signal generator 470 is controlled so that a track jump is performed.

The jump signal generator 470 generates a control signal indicating a first direction jump signal or a second direction jump signal and provides the control signal to the switching unit 480. Further, the jump signal generator 470 provides a jump signal to the driver 500 to operate the driver 500. When the track jump of the optical pickup unit 400 is completed, the jump completion signal is output to the jump state detector 510. To provide.

The switching unit 480 is switched in response to the control signal from the jump signal generator 470, and provides the first and second direction jump signals from the jump signal generator 470 to the driving unit 500. . Also, the switching unit 480 connects the driving unit 500 and the jump signal generation unit 470 when the control signal from the jump signal generation unit 470 is at a low level, and determines that the control signal is at a high level. , The phase compensator 420 and the jump signal generator 470 are connected.

The driving unit 500 controls the switching unit 480 from the jump signal generation unit 470.
A drive signal is provided to the optical pickup unit 400 such that the optical pickup unit 400 is jumped in the first direction or the second direction according to the first direction jump signal or the second direction jump signal provided through the optical pickup unit. .

The jump state detector 510 includes a peak detector 511, a first comparison level signal generator 512, a second comparison level signal generator 513, a second comparator 514, a third comparator 515, an OR gate 516, A first flip-flop 517 and a second flip-flop 518 are provided.

The peak detecting section 511 detects the highest peak value and the lowest peak value of the tracking error signal from the inverting / non-inverting section 430 and outputs the highest peak value signal and the lowest peak value signal, respectively.

The first comparison level signal generator 512 outputs a high comparison level signal corresponding to the highest peak value signal from the peak detector 511. The second comparison level signal generator 513 outputs a low comparison level signal corresponding to the lowest peak value signal from the peak detector 511. At this time, the high comparison level signal and the low comparison level signal are reference levels for determining a track jump state of the optical pickup unit 400.
That is, if a system error occurs during the jump of the optical pickup unit 400, the level of the tracking error signal is abnormally high,
Or, lower. Accordingly, when the level of the tracking error signal is higher than the high comparison level signal and when the level of the tracking error signal is lower than the low comparison level signal, the track jump state of the optical pickup unit 400 is abnormal.

The second comparing unit 514 compares the tracking error signal from the inverting / non-inverting unit 430 with the high comparison level signal from the first comparison level signal generating unit 512, and the tracking error signal is If it is higher than the high comparison level signal,
The high-level second clock signal is output.

The third comparison unit 515 compares the tracking error signal from the inversion / non-inversion unit 430 with the low comparison level signal from the second comparison level signal generation unit 513, and the tracking error signal is If it is smaller than the low comparison level signal,
A high-level third clock signal is output.

The OR-gate 516 logically sums the second clock signal from the second comparing section 514 and the third clock signal from the third comparing section 515 to obtain a stable state of track jump. Alternatively, a track jump state signal indicating an unstable state of the track jump is provided to the control unit 490. That is, if the level of the tracking error signal is higher than the level of the high comparison level signal, or if the level of the tracking error signal is lower than the level of the low comparison level signal, the OR-gate 516 causes a high-level track jump. A status signal is provided to the control unit 490. Accordingly, when a high-level track jump state signal is provided from the OR gate 516, the control unit 490 controls the jump signal generation unit 470 to interrupt the track jump of the optical pickup unit 400.

The first flip-flop 517 receives the second clock signal from the second comparing unit 514 and receives the jump completion signal from the jump signal generating unit 470, and the track jump of the optical pickup unit 400 is over jump. An over-jump state signal indicating whether there is any is provided to the control unit 490.

The second flip-flop 518 receives the third clock signal from the third comparing unit 515 and receives the jump completion signal from the jump signal generating unit 470, and the track jump of the optical pickup unit 400 is under jump. An under-jump state signal indicating the presence is provided to the control unit 490. At this time,
The first flip-flop 517 and the second flip-flop 518 are enabled at the rising edge of the jump completion signal from the jump signal generator 470.
le).

The storage unit 520 stores an acceleration time standard value and a deceleration standard value representing a ratio between a peak value of a standard tracking error signal of each track jump and the reference level.

The controller 490 sets the level of the reference level signal output from the reference level generator 450 based on the standard acceleration time and the standard deceleration time stored in the storage 520. Also, the control unit 490 receives the track jump state signal from the jump state detection unit 510, the first clock signal from the first comparison unit 460, and the storage unit 520.
The jump signal generator 470 is controlled based on the standard value signal.

In a method and apparatus for controlling a track search of an optical disc system according to the present invention, the optical disc system can minimize jump errors such as over jump or under jump of an optical pickup unit,
An unstable reproduction operation due to instantaneous oscillation (osillation) of the optical pickup unit can be prevented. Also, after the track jump operation of the optical pickup unit is performed, the optical disk system can reduce a delay time for performing a normal reproduction operation of the optical disk. Therefore, the optical disk system can perform a precise and stable track search.

As described above, the present invention has been specifically described with reference to the above-described embodiment. However, the present invention is not limited to this, and modifications can be made within a range of ordinary knowledge of those skilled in the art. .

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing a track jump position of an optical pickup unit on an optical disk.

FIG. 2 is a block diagram showing a circuit configuration of an apparatus for controlling a track search of the optical disc system according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a method for controlling a track search of an optical disk system using the apparatus shown in FIG. 2;

FIG. 4 is a block diagram showing a circuit configuration of an apparatus for controlling a track search of an optical disk system according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating a method for controlling a track search of an optical disk system using the apparatus shown in FIG. 4;

FIG. 6 is a block diagram showing a circuit configuration of an apparatus for controlling a track search of an optical disc system according to a third embodiment of the present invention.

[Procedure amendment]

[Submission Date] April 6, 2000 (200.4.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

──────────────────────────────────────────────────の Continued on the front page (31) Priority claim number 1997/49168 (32) Priority date September 26, 1997 (September 26, 1997) (33) Country claiming priority South Korea (KR) (81) Designated countries EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE), CN, JP

Claims (9)

[Claims] (I) reading acceleration information of a currently loaded optical disc from an acceleration information storage area to reproduce a program stored on the optical disc; and (ii) a light beam based on the first acceleration information. Performing a track jump to transfer the target track to a target track; and (iii) comparing a first signal indicating a position of the target track with a second signal indicating a current jump track position to detect an error of the track jump. And (iv) using the acceleration information as new acceleration information of the optical disc compensated by the error so that a track jump error is reduced during the next reproduction of the optical disc based on the result of the comparison. Updating the first signal and the error after (v) a track jump. Performing a precise search for the target track using the target track. 2. The method according to claim 1, wherein: (i) monitoring an input of a track search key signal; and (i-2) updating the acceleration information of the optical disc after the input of the track search key signal. And (i-3) if the acceleration information has been updated at least once, the last updated acceleration information is read, and the update of the acceleration information is performed. Reading the standard acceleration information of the acceleration information as acceleration data if the acceleration information has not been performed, the method as claimed in claim 1, further comprising the steps of: And (iii) storing the acceleration data used for the track jump in the storage area when an error of the track jump is within an error limit range. And (iii-2) calculating a distance error between the target track position and the current jump track position, correcting the acceleration data based on the distance error, and when the track jump error falls outside the error limit, Updating the acceleration information of the currently loaded optical disc into the storage area together with the corrected acceleration data. 2. The method of claim 1, further comprising the steps of: 4. A step of: (a) reproducing an optical disc in a general reproduction mode using a first servo gain and a first servo offset value stored in a data storage area as servo control variables; and (b) a user. Calculating a track jump distance between the target track and the current track designated by selecting (c); and (c) calculating a second servo gain and a second servo offset value corresponding to the track jump distance from the storage area. Detecting; (d) performing a track jump of the optical pickup unit to a target track of the optical disc; and (e) determining whether a jumped position of the optical pickup unit is within an error limit range from the target track. The second servo gain and the second servo offset value based on the second servo gain and the second servo gain. And (f) when the servo control time in step (e) reaches a preset time, the servo control of the optical disk is performed using the first servo gain and the servo offset value. Performing a track search in an optical disc system. 5. The step (e) includes: (e-1) checking whether a jump position of the optical pickup unit is the same as the target track position; and (e-2) jumping the optical pickup unit. Returning to step (d) if the position is outside the error limit from the target track; and (e-3) if the jump position of the optical pickup unit is within the error limit from the target track, the second servo. 5. The method for controlling a track search in an optical disk system according to claim 4, comprising performing servo control of the optical disk corresponding to a gain and the second servo offset value. 6. The step (f) includes: (f-1) counting and checking whether the servo control time in the step (e) reaches the preset time, and (f-2). If the time counted in the step (f-1) remains below the already set time, returning to the step (e-3); and (f-3) the counted time If it is the same as the time already set,
Performing a servo control of the optical disc corresponding to the first servo gain and the first servo offset value. 6. The method according to claim 5, further comprising: . 7. An optical pickup unit for reading data from an optical disk and outputting a data signal, and for processing the data signal into a digital signal and outputting a reproduction position signal indicating a current reproduction position of the optical pickup unit. Reproducing means; focusing means for performing focusing servo of the optical pickup unit; tracking means for performing tracking servo of the optical pickup unit; transfer servo means for transferring the optical pickup unit; Storage means for storing a servo gain and a servo offset value corresponding to a track jump distance of the optical disk; and detecting the first servo gain and the first servo offset value from the storage means, and The first sir The focusing servo means and the tracking servo means are controlled so that the servo control of the optical disc is performed according to the Booffset value, the playback position signal is received from the playback means, and the track jump signal input by the user's key selection is used. Calculating a jump distance between a current reproduction track and a target track of the optical pickup unit, reading a second servo gain and a second servo offset value corresponding to the calculated jump distance from the storage unit, The optical pickup unit is controlled based on a second servo gain and a second servo offset value so that the optical pickup unit jumps to a target track, and the second servo gain and the second servo gain are controlled during a preset time. 2 Servo offset value of the optical disk according to the offset value Controlling said focusing servo means and tracking servo means so as turbo control is performed,
Control means for controlling the focusing servo means and the tracking servo means such that when the preset time is exceeded, the servo control of the optical disc is performed according to the first servo gain and the first servo offset value. An apparatus for controlling a track search of an optical disc system, comprising: 8. An optical pickup unit for irradiating an optical disk with a laser beam, converting light reflected from the optical disk into an electric signal, and outputting the electric signal, based on the electric signal from the optical pickup unit. A tracking error signal generating means for outputting a tracking error signal indicating whether the center of a track of the optical disc is accurately irradiated with the laser beam, and inverting the tracking error signal from the tracking error signal generating means or Inversion / non-inversion means for non-inversion, peak holding means for holding a peak value of the tracking error signal from the inversion / non-inversion means and outputting a peak value signal of the tracking error signal, A reference level corresponding to the peak value signal from the peak holding means. A reference level generator for outputting a tracking error signal from the inverting / non-inverting means and a level of the reference level signal from the reference level generating means. A first comparing means for generating a first clock signal each time a level matches the level of the reference level signal; and a tracking error signal from the inverting / non-inverting means and a previously set comparison level signal. A jump state detecting means for comparing and outputting a track jump state signal indicating a track jump state; a driving means for providing a drive signal to the optical pickup unit to cause the optical pickup unit to perform a track jump; A jump signal is provided to the driving means to operate the driving means, and When the track jump of the up unit is completed, a jump signal generating means for providing a jump completion signal to the jump state detecting means, and an acceleration time indicating a pick value of the tracking error signal and a level ratio of the reference level. Storage means for storing a standard value and a deceleration time standard value; and a track jump state signal from the jump state detection means;
Control means for controlling the jump signal generating means for controlling a track jump of the optical pickup unit according to a first clock signal from a comparing means and a standard value signal from the storage means. For controlling track search in an optical disk system. 9. The jump state detecting means detects the highest peak value and the lowest peak value of the tracking error signal from the inverting / non-inverting means, and outputs a highest peak value signal and a lowest peak value signal. First comparison level signal generating means for outputting a high comparison level signal corresponding to the highest peak value signal from the peak detection means, and the lowest peak value from the peak detection means. A second comparison level signal generating means for outputting a low comparison level signal corresponding to the signal; comparing the tracking error signal from the inverting / non-inverting means with the high comparison level signal; If the signal is larger than the high comparison level signal, the second comparing means for outputting the second clock signal and the signal from the inverting / non-inverting means are output. Comparing the locking error signal with the low comparison level signal, and if the tracking error signal is smaller than the low comparison level signal, third comparing means for outputting a third clock signal; and the second clock signal and the second clock signal. An OR-gate for logically combining the three clock signals to provide a track jump state signal indicating a track jump stable state or a track jump unstable state to the control means; the second comparing means and the jump signal; A first flip-flop for receiving the second clock signal and the jump completion signal from the generating means and providing the control means with an over-jump state signal indicating whether a track jump of the optical pickup unit is an over-jump; And the third comparing means and the jump signal generating means respectively A second flip-flop for receiving the three clock signal and the jump completion signal and providing an under jump state signal to the control means indicating whether the track jump of the optical pickup unit is an under jump. An apparatus for controlling a track search of the optical disk system according to claim 8.