KR100617209B1 - Optical record/player and track jump method - Google Patents

Abstract

An optical recorder and a track jump method. In particular, when a track jump command is input, the track jump is held until a falling edge of the header mask signal is detected, and the track jump is performed at the falling edge of the header mask signal. By finishing the track jump before the rising edge of the header mask signal, the track jump can be performed stably and accurately since the TZC signal is not affected by the header during the track jump.

Jump, header

Description

Optical record / player and track jump method

1 is a block diagram of a general optical recording / reproducing apparatus

2A to 2D are waveform diagrams related to a tracking error signal, a TZC signal, and a track jump when a header region exists during track jumps.

3 is a flowchart of a track jump method according to the present invention.

4 (a) to 4 (e) show a tracking error signal, a TZC signal, and a track jump associated with a track jump generated by performing track jump to avoid a header area according to the present invention.

5A to 5E are waveform diagrams related to a track error signal, a TZC signal, and a track error signal generated during the N track jump avoiding the header area according to the present invention.
6 is a block diagram of an optical recording / reproducing apparatus according to the present invention;

Explanation of symbols for the main parts of the drawings

101: optical disk 102: optical pickup

103: encoder 104: high frequency (RE) signal and servo error generation unit

105: decoder 106: servo control unit

107: focus servo driver 108: tracking servo driver

109: disk motor 110: interface

111: micom 201: track jump control

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording and reproducing apparatus, and more particularly to a method of track jumping so as not to be influenced by a header during track jump.

In general, the tracking servo detects a tracking error signal corresponding to a beam trace state, and based on the signal, moves the objective lens and the main body of the optical pickup to correct the position of the beam and follow a predetermined track.

At this time, a track jump is essential for time search or variable bit rate (VBR) operation. When the number of tracks to be jumped is small, the track is found using a tracking actuator.

FIG. 1 is a block diagram showing a general configuration of an optical recording / reproducing apparatus capable of performing such a track jump. In the optical pickup 102, an optical disk 101, in which an optical beam focused on an objective lens under the control of the servo control unit 106, is collected. The light reflected from the signal recording surface is again focused on the objective lens and then incident on the photo detector (not shown) for detection of the focus error signal and the tracking error signal.

The photo detector includes a plurality of photo detectors, and an electrical signal proportional to the amount of light obtained from each photo detector is output to the high frequency (RE) signal and the servo error generator 104. The high frequency (RE) signal and the servo error generator 104 may include a high frequency signal (RE) for data reproduction, a focus error signal (FE) for servo control, and a tracking error signal (TE) from an electrical signal output from the photodetector. ) And the like. At this time, the high frequency (RE) signal is output to the decoder 105 for reproduction, servo error signals such as FE and TE are output to the servo control unit 106, and the control signal for data recording to the encoder 103. Is output.

The encoder 103 encodes data to be recorded into recording pulses in a format required by the optical disk 101, and then records them on the optical disk 101 through the optical pickup 102, and the decoder 105 transmits the high frequency wave. (RE) Restores the original form of data from the signal.

Meanwhile, a host such as a PC may be connected to the optical recording / reproducing apparatus. The host transmits a recording / reproducing command to the microcomputer 111 through the interface 110 of the optical recording / reproducing apparatus. Data to be recorded is transmitted to the 103, and the reproduced data is received from the decoder 105. The microcomputer 111 controls the encoder 103, the decoder 105, and the servo controller 106 according to a recording / reproducing command of the host.

In this case, the interface 110 generally uses an advanced technology attached packet interface (ATAPI). In other words, ATAPI is an interface standard between an optical recording / playback device such as a CD or DVD drive and a host, and it is a standard proposed to transmit data decoded by an optical recording / playback device to a host. It converts the protocol into an in-packet form and transmits it.

Meanwhile, the servo controller 106 processes the focus error signal FE to output a driving signal for focusing control to the focus servo driver 107, and processes the tracking error signal TE to perform tracking control. The driving signal for outputting to the tracking servo driver 108.

At this time, the focus servo driver 107 moves the optical pickup 102 up and down by driving the focus actuator in the optical pickup 102 so that the optical disc 101 follows the vertical movement along with the rotation.

In addition, the tracking servo driver 108 drives the tracking actuator in the optical pickup 102 to move the objective lens of the optical pickup 102 in the radial direction to correct the position of the beam and follow a predetermined track. do.

At this time, if the optical disk 101 is a rewritable disk, especially a DVD-RAM, the first disk has no information, and thus disk control and recording are impossible. To this end, disc tracks are made in lands and grooves, information is recorded along the tracks, and control information for sector address, random access, rotation control, etc. is separately recorded on the disc, thereby providing information signals. Tracking control can be performed even on a blank disc on which recording is not recorded. In this case, the control information may be recorded by pre-formatting the header area at each sector at the start of the sector. As an example, the header area pre-formatted at the start of each sector is composed of four header fields (header 1 field and header 4 field). Here, the header 1,2 fields and the header 3,4 fields are staggered from the track center.

At this time, the header area can be easily seen by looking at the high frequency (RE) signal and the high frequency (RE) signal generated by the servo error generator 104. That is, in the high frequency (RE) signal as shown in FIG. 2D, the header region is always at least a certain level, and is in phase with respect to the header 1,2 field and the header 3,4 field.

On the other hand, when the track jump command is input, the high frequency (RE) signal and the servo error generator 104 are connected to the high frequency (RE) signal (that is, FIG. 2D) through the pickup 102 while only the focus servo is turned on. Simultaneously with detecting the tracking error signal TE (that is, a of FIG. 2), the servo controller 106 generates a kick pulse (or also referred to as a jump pulse) as shown in FIG. To the tracking actuator. At this time, when the kick pulse is applied, the speed of the tracking actuator is increased, and the objective lens of the tracking actuator is pushed in the track jump direction by acceleration.

Then, the brake pulse is applied to the actuator for a predetermined break time at the zero crossing time point of the tracking error signal generated at this time to reduce the speed of the actuator. That is, the tracking actuator accelerates with a kick pulse and then drops when the brake pulse is generated. The brake pulse is an inverted pulse of the kick pulse, which is generated to stop the actuator stably and accurately at a desired position. After the preset break time, the tracking servo is turned on.

Accordingly, a tracking zero crossing (TZC) signal such as (b) of FIG. 2, which is turned on / off at the zero crossing time point of the tracking error signal TE, provides a kick pulse, a brake pulse, and a break on time during a track jump. It is used as a reference signal to determine. That is, the TZC signal is used as a reference signal when determining when to generate a brake pulse from the kick pulse.

By the way, if the tracking actuator passes through the header area during track jump (i.e., see the circle in a of FIG. 2), the TZC position may appear earlier or later than the original position due to the header, and the TZC signal may also appear in FIG. One more pulse may occur, as shown in the original part of (b).

Therefore, if the optical disk 101 is a disk having a header area such as a DVD-RAM, a problem may occur due to the header area during track jump.

That is, if the TZC position occurs earlier or later than the original position, or if more TZC pulses occur, the track jumps out of the position to be generated and the kick time, break time, and servo on time are not constant. Is not made accurately and stably.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical record player and a track jump method for performing a track jump away from the header area.

In accordance with another aspect of the present invention, there is provided a track jump method, the method comprising: receiving a track jump command, checking whether a current position is a point at which a header area ends when a track jump command is received, If it is the end point, the track jump is executed. If the header area is not finished, the track jump is executed. If the header area ends, the track jump is executed.
The checking may include determining a polling time point of a header mask signal indicating a header area as a point at which the header area ends.
The track jump execution step may end the track jump before the rising time of the header mask signal indicating the header region in the high period.
The present invention is characterized by repeating the process of ending track jump and turning on the servo N times before the rising edge of the header mask signal after starting the track jump at the falling edge of the header mask signal when receiving N consecutive track jump commands. .
An optical recorder according to the present invention comprises: an optical pickup for recording and reproducing information on an optical disk; A high frequency (RE) signal and a servo error generation unit for generating a wobble signal, a high frequency (RE) signal, a tracking error signal, and a focus error signal from the electrical signal output from the optical pickup; And a track jump control unit configured to detect a header area from the output of the high frequency (RE) signal and the servo error generator, and to hold a track jump in the header area when the header area exists when the track jumps. .
When the track jump command is input, the track jump controller executes a track jump if the current position is a point at which the header region ends. If the track jump command is not at the end of the header region, the track jump controller waits without executing the track jump and executes a track jump when the header region ends. Characterized in that.
The track jump controller generates a header mask signal indicating that a high section is a header region from a high frequency (RE) signal.
The track jump controller generates a header mask signal indicating that a high section is a header region from a wobble signal.
The track jump controller may hold a track jump until a falling edge of the header mask signal is detected.
As described above, the present invention performs a track jump at the polling time of the header mask signal to avoid the header area during the track jump, and holds the track jump command even before the track jump command. Here, the header mask signal is a signal indicating the header area, and there are various methods of detecting and generating the header area. For example, the header mask signal may be generated using a wobble signal formed in a wobbled shape on a track, It may be generated using the RE) signal.

delete

delete

delete

In the present invention, for example, it is assumed that the header mask signal is a high header section, and a low data recording area. In this case, the polling time point of the header mask signal is a time point at which the header area ends.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

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

3 is a flowchart for performing a track jump method according to the present invention.
FIG. 6 is an optical recorder according to the present invention, in which a track jump control unit 201 for performing the track jump of FIG. 3 is further added.
That is, when a track jump command is input (step 301), it is first determined whether the header mask signal H / M as shown in (d) of FIG. 4 is a falling edge before performing the track jump (step 302). This is to track jump away from the header area.

Therefore, if the falling edge of the header mask signal is not detected in step 302, the track jump command is held until detected, and if the falling edge of the header mask signal is detected as shown in FIG. The track jump direction is checked (step 303). That is, it is determined whether the track jump direction is from the inner circumference to the outer circumference or from the outer circumference.

When the track jump direction is determined in step 303, a kick pulse is generated and applied to the actuator as shown in (e) of FIG. 4 in the determined track jump direction (step 304). That is, when the kick pulse occurs in step 304, the speed of the actuator increases, and the objective lens of the tracking actuator is pushed in the track jump direction by acceleration.

At this time, the brake pulse is applied to the actuator for a predetermined break time at the rising edge of the TZC signal generated as shown in FIG. 4 (b) to reduce the speed of the actuator (step 305).

At this time, when the preset brake time ends, the tracking servo and the slad servo are turned on (step 306). In particular, the tracking servo and the slad servo start on track jump and then turn on before the next header mask signal rises.

For example, if the optical disc is a DVD-RAM, data can be recorded in both lands and grooves, so that two tracks are jumped during one cycle of the tracking error signal as shown in FIG.

As described above, the present invention performs the track jump to avoid the header area, so that the TZC signal is not affected by the header as shown in FIG. Therefore, during the track jump, the TZC position is not earlier or later than the original position, and no further TZC signal is generated by one more pulse. In other words, accurate and stable track jump is achieved.

5A to 5E are waveform diagrams when two track jumps are performed N times in succession, and track jumps are avoided similarly to the header section.

That is, after the track jump starts at the falling edge of the header mask signal, the process of ending the two track jumps and turning on the servo before the rising edge of the header mask signal is repeated N times.

As described above, according to the optical recorder and the track jump method according to the present invention, when the track jump command is input, the track jump is held until the polling edge of the header mask signal is detected, and then at the polling edge of the header mask signal. By performing the track jump and finishing the track jump before the rising edge of the header mask signal, the track jump is stable and accurate since the TZC signal is not affected by the header.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (16)

In the track jump method of an optical disc in which a header area exists, Receiving a track jump command; Checking whether a current position is a point at which a header area ends when a track jump command is received; And Performing a track jump if the header region ends, and if the header region is not finished, waiting for the track region without executing the track jump and executing the track jump when the header region ends. The method of claim 1, wherein the checking step And a polling time point of the header mask signal indicating the header area in the high period as the end point of the header area. The method of claim 1, wherein performing the track jump The track jump method of claim 1, wherein the track jump ends before the rising time of the header mask signal indicating the header region in the high period. The method of claim 2, When the track jump command is received N times, the track jump starts at the falling edge of the header mask signal, and then the track jump is repeated N times before ending the track jump and turning on the servo before the rising edge of the header mask signal. Way. Apparatus for recording / reproducing an optical recording medium in which a plurality of header areas having different phases are arranged to distinguish the shape of the data area between writable data areas in which information capable of recognizing a reference frequency is wobbed on a track. To An optical pickup for recording and reproducing information on the optical recording medium; A high frequency (RE) signal and a servo error generation unit for generating a wobble signal, a high frequency (RE) signal, a tracking error signal, and a focus error signal from the electrical signal output from the optical pickup; And And a track jump control unit configured to detect a header area from the output of the high frequency (RE) signal and the servo error generation unit, and to hold a track jump in the header area when the header area exists when the track jumps. Recording / reproducing apparatus of a recording medium. The method of claim 5, wherein the track jump control unit If the current position is the point where the header area ends when the track jump command is input, the track jump is executed. If the track area is not the end point, the track jump is executed without waiting for the track jump. An apparatus for recording / reproducing an optical record carrier. The method of claim 5, wherein the track jump control unit An apparatus for recording / reproducing an optical record carrier, characterized by generating a header mask signal indicating that a high section is a header region from a high frequency (RE) signal. The method of claim 5, wherein the track jump control unit An apparatus for recording / reproducing an optical record carrier, characterized by generating a header mask signal indicating that a high section is a header region from a wobble signal. The method of claim 7 or 8, wherein the track jump control unit And hold a track jump until a falling edge of the header mask signal is detected. The method of claim 7 or 8, wherein the track jump control unit And a track jump is ended before a rise time of the header mask signal. The method of claim 7 or 8, wherein the track jump control unit When the track jump command is received N times, the track recording starts at the falling edge of the header mask signal, and then the track recording is terminated and the servo is turned on N times before the rising edge of the header mask signal. Recording / playback device. In the track jump method of an optical disc in which a header area exists, If a track jump command is received, checking whether the header area ends at the header mask signal; And And performing a track jump if the header region ends. The method of claim 12, If the header area is not at the end point, waits without executing the track jump and executes the track jump when the header area ends. An apparatus for recording / reproducing an optical recording medium in which a plurality of header areas are arranged, A high frequency (RF) signal and a servo error generation unit for detecting a signal reflected from the optical record carrier and generating a wobble signal, a high frequency (RF) signal, a tracking error signal, and a focus error signal; And And a track jump controller for detecting a header area from the output of the high frequency (RF) signal and the servo error generator and controlling whether or not a track jump is performed. The method of claim 14, wherein the track jump control unit, And if the current position is a point at which the header area ends when the track jump command is input, the track jump is executed. The method of claim 14, wherein the track jump control unit, And if the current position is not the end of the header area when a track jump command is input, the track jump is held.

Images