JPH10340460A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device which can perform stable pause operation even if DC offset is included. SOLUTION: This optical disk recording and reproducing device moves an optical pickup on an optical disk 1, positions an optical pickup 2 to an object track position by a tracking servo circuit 12, irradiates the optical disk 1 with a light beam by an optical system of the optical pickup 2, and records or reproduces a recording mark. Further, when the optical pickup 2 is moved in the track direction of the optical disk 1 or the direction of the sector, an offset component is detected by a DC monitor means 12a from a tracking error signal of the tracking servo circuit 12, and pause operation is started at a position at which an offset component is made the minimum in the prescribed section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc (CD-RO)
M) or a pause operation when recording or reproducing data on a write-once compact disc (CD-R) using a light beam.

[0002]

2. Description of the Related Art With the development of multimedia oriented to the advanced information society, there is a demand for higher performance and larger capacity of optical discs. This optical disc can be broadly classified into two types, a read-only optical disc that only reproduces information data recorded at the time of disc cutting, and a write-once optical disc that can be recorded only once and cannot be rewritten, according to its function and purpose of use. .

[0003] In such an optical disk, since a large capacity is required, information data is recorded only in a groove portion formed by a spiral groove on the recording optical disk surface during disk cutting or additional recording. Since the required recording capacity cannot be satisfied only by the groove recording method, a land-groove recording method of recording information data in a portion called a land portion between the groove portions has been adopted.

That is, in order to record information data on a predetermined track on an optical disk in an optical disk recording / reproducing apparatus, an optical pickup is moved onto a target track of the optical disk and a laser beam is irradiated onto the target track. There must be. For this purpose, it is necessary to position the optical pickup at the target position. There is a tracking servo system as a servo system for moving an optical pickup to a target position in a radial direction of an optical disk.

[0005] The tracking servo system comprises a tracking coil and a tracking servo circuit of the actuator system in the optical pickup. The actuator system causes the optical pickup to perform a fine tracking operation by, for example, a two-axis actuator.

Then, the laser beam tracks the track, tracks the track, reads the address, and knows the difference from the target address, and performs a fine seek by that amount. At this time, if the eccentric speed is high, it is difficult to perform seek control stably, so wait until the eccentric speed decreases, finally reach the target track, and land on the optical disc between the groove portions. The recording operation is performed by a land / groove recording method for recording information data on the recording medium.

FIG. 4 shows tracking by the push-pull method used in the conventional land / groove recording method.
The tracking by the conventional push-pull method will be described with reference to FIG. In FIG. 4A, groove portions G1, G2,
Land portion L between G3 and groove portions G1, G2, G3
In the land / groove recording method of recording information data also in portions called L1, L2, L3, adjacent groove portions G1, G2, G3 and land portions L1, L2, L3
In order to record information data together, each groove portion G1,
It is necessary to perform tracking on G2, G3 and land portions L1, L2, L3.

In the push-pull method, a tracking error is detected by extracting light reflected and diffracted by groove portions G1, G2, and G3 on a recording thin film on an optical disk as an output difference between two divided light receiving surfaces on a photodiode. How to That is, as shown in FIG. 4A, the laser spot and the center of the groove portions G1, G2, G3, or the laser spot and the groove portions G1, G2, G3 called land portions L1, L2, L3 and the groove portion G1,
In the case where the centers of the intermediate portions of G2 and G3 coincide with each other, the tracking error signal 101 is obtained in FIG. 4B as a symmetrically reflected and diffracted light distribution in a state where the tracks coincide with each other. In other cases, since tracking is not performed, the track is shifted, and the light intensity is shifted between the left and right.
It becomes a curve. Thus, the tracking error signal 101 becomes “0”, and the groove portions G 1
Center of G2, G3, or land part L1, L2, L3
Tracking can be performed at the center of the

[0009] Here, as shown in FIG.
An offset may also occur due to a radial tilt (radial tilt) of 00. In FIG. 5, when the optical disc 100 is inclined by Δθ with respect to a plane orthogonal to the optical axis of the laser beam, the photodiode 103
In the above, f · 2Δθ with respect to the focal length f of the objective lens 102
Only because the beam spot of the reflected light of the optical disc 100 moves, the push-pull signal is offset due to the imbalance in light intensity.

Therefore, when the beam spot is at the center of the photodiode 103, when the beam spot crosses the track of the optical disc 100, light and dark appear on the photodiode 103, and the zero cross point of the tracking error signal 101 becomes the track center. Therefore, tracking can be performed using the tracking error signal 101. However, when the beam spot moves out of the center of the photodiode 103, that is, when the objective lens 102 is driven in the radial direction by the tracking operation or when the optical disc 100 has a radial tilt, the light intensity distribution of the beam spot is Since the racking error signal moves on the diode 103, the racking error signal becomes a signal having a DC offset corresponding to a slow swell. Tracking cannot be performed using a tracking error signal having such an offset.

For example, Japanese Patent Laying-Open No. 4-132056 discloses a temporary stop device of a disk reproducing apparatus having a timing change circuit for changing a track jump when the spindle servo system is not locked. In this disk reproducing apparatus, when performing a pause operation on an optical disk recorded at a constant linear velocity (CLV), a reading point is set to one in the inner circumferential direction (a direction opposite to the reading direction) every time the optical disk makes one rotation. The track jump is performed, and this one-track jump operation is repeated. FIG. 6 shows a waveform diagram of a one-track jump when performing a conventional pause operation. As shown in FIG. 6, the one-track jump waveform 105 indicated by the tracking error signal TE becomes a waveform having the DC offset 106 during one rotation of the disk 104, and the DC offset 107 during the next rotation of the disk. Appears as well.

[0012]

As described above, the one-track jump waveform at the time of performing the conventional pause operation shows that the light intensity distribution of the beam spot moves on the photodiode 103 when the optical disc 100 has a radial tilt. The DC offset due to
Since the pause operation by one-track jump was performed without paying any attention to the offset, there was a problem that the pause operation by one-track jump became unstable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an optical disk recording / reproducing apparatus capable of performing a stable pause operation even when a DC offset is present.

[0014]

An optical disk recording / reproducing apparatus according to the present invention moves an optical pickup on a recording medium, positions the optical pickup at a target track position by tracking means, and uses the optical system of the optical pickup to perform optical operation. In an optical disk recording / reproducing apparatus for recording or reproducing a recording mark by irradiating a beam onto the recording medium, when the optical pickup is moved in a track direction or a sector direction of the recording medium, a tracking error signal of the tracking means is used. The offset component is detected, and moves at a position where the offset component is minimum in a predetermined section.

According to the optical disk recording / reproducing apparatus of the present invention, the following operations are performed. This optical disk recording / reproducing device
An optical pickup is moved on a recording medium, the optical pickup is positioned at a target track position by tracking means, and a light beam is irradiated on the recording medium by an optical system of the optical pickup to record or reproduce a recording mark. Further, the optical disk recording / reproducing apparatus detects an offset component from a tracking error signal of the tracking means. Then, the optical disc recording / reproducing apparatus moves the optical pickup in a track direction or a sector direction of the recording medium at a position where the offset component is minimized in a predetermined section.

[0016]

Embodiments of the present invention will be described below. The optical disk to which this embodiment is applied is a compact disk (CD). There are several families of CDs, including a read-only CD-ROM and a CD-R that can be written only once. This embodiment is applied to this CD family.

Next, the configuration of the present embodiment applied to such an optical disk will be described. FIG. 1 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to the present embodiment. First, the configuration of the optical disk recording / reproducing apparatus will be described. The optical disk recording / reproducing apparatus of this embodiment includes an optical disk rotation drive control system, a coarse feed drive control system, a servo control circuit 5 for controlling respective servo systems of an optical pickup control system, and a laser supplied to the optical pickup 2. It has a laser control circuit 6 for controlling the power, an IV conversion matrix circuit 8 for obtaining a reproduction RF signal, a focus error signal and a tracking error signal from the reflected light of the laser, and a signal control circuit 7.

The optical disk rotation drive control system has a spindle servo circuit 9, a spindle motor 3, and the optical disk 1. Here, the optical disk 1 constitutes a recording medium. The coarse feed drive control system includes a thread servo circuit 10.
And a thread motor 4. The optical pickup control system includes an optical pickup 2, an IV conversion matrix circuit 8, a focus servo circuit 11, a tracking servo circuit 12, and a laser control circuit 6. Here, the IV conversion matrix circuit 8 includes a photodiode 21 for detecting the reflected light of the laser on the two-divided surface, an adder 22 for adding the two-divided signal, and a subtractor 23 for subtracting the two-divided signal. An RF amplification circuit 24 that amplifies the reproduction RF signal from the output of the adder 22 and supplies a servo signal to the thread servo circuit 10; a focus error detection circuit 25 that detects a focus error signal from the output of the subtractor 23; And a tracking error detection circuit 26 for detecting a tracking error signal from the output of the reference numeral 23. Further, the laser control circuit 6 includes a PWM driver 14 that performs pulse width modulation on the laser light, and a laser diode 13 that emits the laser light.

The signal control circuit 7 includes a system control circuit 19 for controlling each part of the apparatus, and an EC for adding an error correction code to the recording data using a Reed-Solomon product code.
A C encoding circuit 16; a modulation circuit 15 for EFM modulating the recording data to which the error correction code is added; a demodulation circuit 17 for EFM demodulating the reproduction data and supplying a servo signal to the spindle servo circuit 9; And an ECC decoding circuit 18 for performing error correction processing with a Solomon product code and outputting reproduced data.

Here, in this example, in particular, the tracking servo circuit 12 supplies the light intensity distribution of the beam spot due to the radial tilt of the optical disc 1 to the photodiode 21.
It is configured to include a DC monitoring unit 12a that monitors a DC offset due to the above movement for a period of one rotation of the optical disk 1 and searches for a time for performing a pause operation by one track jump stably.

Next, the connection relationship of the optical disk recording / reproducing apparatus will be described. First, the connection relationship of the optical disk rotation drive control system will be described. The spindle servo circuit 9 is a spindle motor 3
, And the spindle motor 3 is connected to the optical disk 1 via a rotation mechanism.

Next, the connection relationship of the coarse feed drive control system will be described. The thread servo circuit 10 is connected to a thread motor 4, and the thread motor 4 is connected to an optical pickup 2 of an optical pickup control system via a coarse feed mechanism.

Next, the connection relationship of the optical pickup control system will be described. The optical pickup 2 is an IV conversion matrix circuit 8
The output of the photodiode 21 is connected to an adder 22 and connected to a subtractor 23. The adder 22 and the subtractor 23 are connected to an RF amplifier circuit 24 and have a focus error. The detection circuit 25 and the tracking error detection circuit 26 are connected.

The focus error detection circuit 25 and the tracking error detection circuit 26 are connected to the focus servo circuit 11 and the tracking servo circuit 12, and the focus servo circuit 11 and the tracking servo circuit 12 Connected to tracking coil.

Next, the connection relationship of the signal processing system will be described. RF
The amplification circuit 24 is connected to the demodulation circuit 17 of the signal control circuit 7, and the demodulation circuit 17 is connected to the ECC decoding circuit 18. Further, the ECC encoding circuit 16 is connected to the modulation circuit 15, and the modulation circuit 15
The PWM driver 14 is connected to the laser diode 13. The laser diode 13 is provided to the optical pickup 2 so as to form a predetermined laser beam.

The optical disk recording / reproducing apparatus is connected to a host computer via a system controller 19 and an interface circuit (not shown).

The schematic operation of the optical disk recording / reproducing apparatus thus configured will be described. When recording or reproducing an information signal with respect to an optical disk recording / reproducing apparatus according to a command from a host computer (not shown), the optical pickup 2 is sought by a thread motor 4 to a target track position on the optical disk 1 from the host computer. After positioning, the tracking servo circuit 12 and the focus servo circuit 11 drive the tracking coil and the focus coil to finely adjust the tracking and the focus to match the target value.

At the time of recording, the laser control circuit 6 sets the laser power in advance to the erase power level to erase the information of the non-recorded portion, and adjusts the laser power to the write power level to record the information signal at the target track position. At the time of reproduction, the laser power is adjusted to the read power level by the laser control circuit 6 to reproduce the information signal recorded at the target track position.

In the signal control system, first, the system control circuit 19 supplies a rotation command to the spindle servo circuit 9 of the servo control circuit 5 based on the host computer. The spindle servo circuit 9
By this command, a drive signal is supplied to the spindle motor 3 to rotate the spindle motor 3. A servo signal synchronously detected from the demodulation circuit 17 based on the reproduced RF signal is supplied to the spindle servo circuit 9.

Next, based on the host computer, the system control circuit 19
To the coarse feed command. Optical pickup 2
Reads the information signal of the current position from the optical disc 1,
RF amplification circuit 24, focus error detection circuit 2 via photodiode 21, adder 22 and subtractor 23
5 and the tracking error detection circuit 26 are supplied with an RF signal, an addition signal and a subtraction signal. The tracking error detection circuit 26 generates a tracking error signal from the difference signal and supplies the signal to the thread servo circuit 10. The thread servo circuit 10 generates a drive signal based on the tracking error signal, and supplies the drive signal to the thread motor 4. The sled motor 4 causes the optical pickup 2 to perform a coarse seek operation via a coarse feed mechanism (not shown) based on the drive signal.

The operation of the seek / servo system is composed of two components: a thread motor 4 system and an actuator system in the optical pickup 2. The thread motor 4 system causes the optical pickup 2 to perform a coarse seek operation by the thread motor 4,
The position is detected by an encoder (not shown). The actuator system includes an optical pickup 2 using a biaxial actuator using a tracking coil (not shown).
The fine seek operation.

The operation sequence of the seek servo system will be described below. First, the coarse seek operation is performed up to the vicinity of the target track position. Even if the coarse pickup is performed and the optical pickup 2 stops near the target address, the movable part of the actuator in the optical pickup 2 does not stop immediately, but vibrates and stops after a predetermined settling time.

Next, a track pull-in operation is performed to read the reached address information. Here, the execution of the track pull-in operation at the time when the track eccentric speed is high is likely to cause a pull-in error, so this operation is waited until the eccentric speed approaches zero.

When the laser beam tracks the track, the tracking coil is driven by the drive signal from the tracking servo circuit 12, the track is tracked on track, the address is read, and the difference from the target address is known. , To do a minute seek. At this time, the optical pickup 2 reads the information signal of the current position from the optical disc 1 and supplies it to the tracking error detection circuit 26.

That is, the photodiode 21 receives the laser beam reflected by the optical disk 2 on the two-divided surface. The photodiode 21 converts the received split laser light into an electric signal and supplies the electric signal to the subtracter 23. The subtractor 23
The difference signal is generated by subtracting the divided signal. The tracking error detection circuit 26 detects a tracking error signal from the difference signal and supplies the signal to the tracking servo circuit 12.
The tracking servo circuit 12 performs tracking of the optical pickup 2 by a tracking coil of a two-axis actuator (not shown) based on a tracking error signal. The focus error detection circuit 25 detects a focus error signal from the information signal and supplies the focus error signal to the focus servo circuit 11. The focus servo circuit 11 performs focusing of the optical pickup 2 by a focus coil of a two-axis actuator (not shown) based on a focus error signal.

Also at this time, if the eccentric speed is high, it is difficult to perform seek control stably. Therefore, it waits until the eccentric speed becomes low, finally reaches the target track, and executes a recording or reproducing operation.

After positioning the optical pickup 2 at the target track position, the recording or reproducing operation is performed as follows. During playback, the system control circuit 19
A reproduction command is supplied to the PWM driver 14 of the laser control circuit 6. The PWM driver 14 adjusts the laser emission power to a reproduction power level and supplies the read power level to the laser diode 13. The laser diode 13 irradiates the optical disc 1 with laser light via a lens. The photodiode 21 converts the laser light reflected by the optical disc 1 into
Light is received on the split surface. The photodiode 21 converts the received split laser light into an electric signal and supplies the electric signal to the adder 22. The adder 22 adds the two divided signals to generate a reproduced RF signal.

The reproduced RF signal is supplied to an RF amplifier circuit 24. The RF amplifier 24 amplifies the reproduced data at a high frequency and supplies the amplified data to the demodulator 17. The demodulation circuit 17 converts the reproduced data into E
Perform FM demodulation. The demodulation circuit 17 supplies the demodulated reproduced data to the ECC decoding circuit 18. The ECC decoding circuit 18 performs an error correction process on the reproduced data using a Reed-Solomon product code and outputs the reproduced data. The decoded information signal is supplied to a host computer.

At the time of recording, the system control circuit 1
9 supplies a recording command to the PWM driver 14 of the laser control circuit 6. The recording data supplied from the host computer is supplied to the ECC encoding circuit 16. The ECC encoding circuit 16 adds an error correction code to the recording data using a Reed-Solomon product code. EC
The C encoding circuit 16 supplies the recording data added with the error correction code to the modulation circuit 15. Modulation circuit 15
EFM records data to which an error correction code has been added.
Modulate. The modulation circuit 15 supplies the modulated recording data to the PWM driver 14 of the laser control circuit 6.
The PWM driver 14 uses the EFM based on the recording command.
The modulated recording data is subjected to pulse width modulation, and a laser emission signal at a write power level is supplied to the laser diode 13. The laser diode 13 irradiates the optical disc 1 with laser light via a lens. The recording data is recorded at the target track position in a state where the recording thin film of the optical disc 1 is heated by the laser beam and becomes amorphous.

In this embodiment, in particular, the DC monitoring means 12a of the tracking servo circuit 12 controls the DC offset component caused by the light intensity distribution of the beam spot caused by the radial tilt of the optical disk 1 moving on the photodiode 21. Is monitored for a period of one rotation of the optical disk 1, a time at which the DC offset is minimum is searched, and a pause operation by one track jump is stably performed at this time.

First, the sequence of the one-track jump operation of the track seek / servo system for the fine seek will be described below. First, a fine seek operation is performed up to a position near a target one track inner peripheral side. The one-track jump of the fine seek is an operation of moving a light beam by one track by applying a pulse current to a movable portion of an actuator in the optical pickup 2 while the optical pickup 2 is stopped at a target address.

That is, the laser beam tracks the track, drives the tracking coil by the drive signal from the tracking servo circuit 11, tracks on track, reads the address, and reads the address for one track from the target address. When the difference is known, a fine seek is performed for the difference of one track. At this time, the optical pickup 2 reads the information signal of the current position from the optical disc 1 and supplies it to the tracking error detection circuit 26.

Hereinafter, DC in such a pause operation will be described.
The operation of the minute monitor will be described. FIG. 2 is a waveform diagram of a DC component monitor for several frames in the pause operation of the present embodiment,
FIG. 3 shows the flowchart. As shown in FIG.
In step S1, the host issues a pause request for n frames (where n is a natural number and is the number of frames of image data of a recorded or reproduced signal). In particular,
In FIG. 1, a signal control circuit 7 is provided from a host computer.
A pause request command is supplied to the system control circuit 19 in n frames. In step S2, the DC component of the tracking error signal TE in n frames is measured. Specifically, in FIG. 1, the system control circuit 19 controls the DC component monitoring means 12a of the tracking servo circuit 12 of the servo control circuit 5 to
A control signal is supplied to measure the DC component of the tracking error signal TE in n frames. At this time, in FIG. 2, the DC component 35 in the n frame 30 of the tracking error signal TE is measured by the DC component monitoring means 12a.

Next, in FIG. 3, in step S3, n
The DC component of the tracking error signal TE in the +1 frame is measured. Specifically, in FIG. 1, the system control circuit 19 sends the tracking error signal TE in the (n + 1) th frame to the DC component monitoring means 12a of the tracking servo circuit 12 of the servo control circuit 5.
The control signal is supplied so as to measure the DC component of. At this time, in FIG. 2, the DC component monitoring means 12a detects the DC of the tracking error signal TE in the (n + 1) th frame 31.
Minute 36 is measured.

Then, in FIG. 3, in step S4,
DC of tracking error signal TE in n + m frame
The minute is measured (where m is a natural number, which is the number of frames of image data of a recorded or reproduced signal). Specifically, in FIG. 1, the system control circuit 19
Tracking servo circuit 1 of servo control circuit 5
The time for performing the pause operation is changed by n + m (for example, m = 4) frames from n frames to about one rotation of the optical disk (several frames) with respect to the DC component monitoring means 12a. A control signal is supplied so as to measure the DC component of the tracking error signal TE. At this time, in FIG. 2, the DC component monitor means 12a uses the DC component 37 in the n + 2 frame 32 of the tracking error signal TE, the DC component 38 in the n + 3 frame 33, and n +
The DC components 39 in the four frames 34 are respectively measured.
In this way, the DC component monitoring means 12a uses the n + frames corresponding to one rotation of the optical disk (several frames) from n frames.
The DC component of the m-frame tracking error signal TE is monitored. Here, the system control circuit 19
Is a tracking error signal TE for n to n + m frames.
Is stored in an internal memory.

Finally, in FIG. 3, in step S5,
The pause operation is performed in a time period in which the DC of the tracking error signal TE in the nth to n + m frames is the shortest. Specifically, in FIG. 1, the system control circuit 19 includes n frames to n + 4 frames 30, 31,
Tracking error signal T at times of 32, 33 and 34
Among the DC components 35, 36, 37, 38, and 39 of E, a frame time corresponding to the DC component of the frame having the lowest voltage level is searched. The system control circuit 19
A control signal for starting a track jump at a position indicating the (n + 1) -frame 31 at the time of the minimum DC minute 36 is supplied to the tracking servo circuit 12 of the servo control circuit 5. The tracking servo circuit 12 supplies a pulse to the tracking actuator of the optical pickup 2 so as to start a one-track jump at the time of the (n + 1) th frame 31. Thus, the optical pickup 2
The tracking actuator described in (3) shows that n +
By performing one track jump in the time of one frame 31, the pause operation is performed without affecting the DC component.

As described above, since the servo control circuit 5 performs the digital servo using the digital PLL, the DC component monitoring means 12a of the tracking servo circuit 12 uses the DC component of the tracking error signal TE at an arbitrary frame time. Can be monitored, so that there is no need to provide an additional circuit.

[0048]

According to the present invention, there is provided an optical disk recording / reproducing apparatus comprising:
An optical disc that moves an optical pickup on a recording medium, positions the optical pickup at a target track position by tracking means, and irradiates a light beam onto the recording medium with the optical system of the optical pickup to record or reproduce a recording mark. In the recording / reproducing apparatus, when the optical pickup is moved in a track direction or a sector direction of the recording medium, an offset component is detected from a tracking error signal of the tracking means, and a position where the offset component is minimized in a predetermined section. In this case, a stable track jump operation is performed even in a case where a recording signal is reproduced from a recording medium having a large eccentricity or in a system in which a DC gain of a tracking error signal from a tracking unit cannot be sufficiently secured. The effect of being able to Achieve the.

Further, in the optical disk recording / reproducing apparatus of the present invention, the movement of the optical pickup is a track jump in the above description. There is an effect that a pause operation can be performed.

In the optical disk recording / reproducing apparatus according to the present invention, the movement of the optical pickup is a one-track jump to the inner circumference side of the recording medium. Even in this case, by performing a one-track jump toward the inner circumference side of the recording medium at a position where the offset component is minimized, there is an effect that a pause operation by a stable one-track jump can be performed.

In the optical disk recording / reproducing apparatus of the present invention, the predetermined section for detecting the minimum of the offset component is a section for one rotation of the optical disk. By moving at the position where the offset component is minimum in the section for the rotation, there is an effect that a stable track jump operation can be performed at the position where the offset component is minimum even for a recording medium with large eccentricity.

In the optical disk recording / reproducing apparatus of the present invention, the predetermined section for detecting the minimum of the offset component is set to be several frames of the reproduction signal of the optical disk. By moving the reproduction signal at the minimum position in a section corresponding to several frames, there is an effect that a stable track jump operation can be performed at a position where the offset component is minimum even for a recording medium with large eccentricity. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc recording / reproducing apparatus according to an embodiment.

FIG. 2 shows D for several frames of a pause operation according to the present embodiment.
It is a waveform diagram which shows C monitor.

FIG. 3 shows D for several frames of a pause operation according to the present embodiment.
It is a flowchart figure which shows C monitor.

4A and 4B are diagrams showing tracking by a conventional push-pull method, FIG. 4A is a diagram showing lands L and grooves G, and FIG. 4B is a diagram showing tracking error signals.

FIG. 5 is a diagram showing a conventional offset due to an inclination of an optical disk.

FIG. 6 is a waveform diagram showing one track jump in a conventional pause operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical pickup, 3 ... Spindle motor, 4 ... Thread motor, 5 ... Servo control circuit, 6 ... Laser control circuit, 7 ... Signal control circuit,
8: IV conversion matrix circuit, 9: spindle servo circuit, 10: thread servo circuit, 11: focus servo circuit, 12: tracking servo circuit, 12a: D
C component monitoring means, 13 laser diode, 14 P
WM driver, 15 modulation circuit, 16 ECC encoding circuit, 17 demodulation circuit, 18 ECC decoding circuit, 19 system control circuit, 20 collimator lens, 21 photodiode, 22 adder, 2
3: subtractor, 24: RF amplifier, 25: focus error detection circuit, 26: tracking error detection circuit

Claims (5)

[Claims] An optical pickup is moved on a recording medium, the optical pickup is positioned at a target track position by tracking means, and an optical system of the optical pickup irradiates a light beam onto the recording medium to form a recording mark. In an optical disc recording / reproducing apparatus for recording or reproducing, when the optical pickup is moved in a track direction or a sector direction of the recording medium, an offset component is detected from a tracking error signal of the tracking means, and the offset component is set to a predetermined interval. An optical disk recording / reproducing apparatus characterized in that the optical disk recording / reproducing apparatus moves at a minimum position. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the movement of the optical pickup is a track jump. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein the movement of the optical pickup is a one-track jump to an inner peripheral side of the recording medium. apparatus. 4. The optical disk recording / reproducing apparatus according to claim 1, wherein the predetermined section for detecting the minimum of the offset component is a section for one rotation of the optical disk. Playback device. 5. The optical disk recording / reproducing apparatus according to claim 1, wherein the predetermined section for detecting the minimum of the offset component is equivalent to several frames of a reproduction signal of the optical disk. Recording and playback device.