JPH06349078A - Tracking servo system for optical disk driving device - Google Patents

Abstract

PURPOSE:To decrease a tracking servo error by rotating an optical disk by a spindle motor and irradiating a track on the optical disk with a light beam of a pickup. CONSTITUTION:A micro-controller 4 analyzes amplitude and a phase of the basic frequency component of the number of rotations of an optical disk 1 by analyzing a sampling value stored in a memory 15 with Fourier, and operates a compensation value of a sine wave state to be given to a tracking servo loop corresponding to a rotation angle of the optical disk 1 based on amplitude and a phase and stores it in the memory 15. Thereby, when information is recorded and/or reproduced, a tracking servo error having a repeating characteristic generated in accordance with the number of rotation of the optical disk can be quickly decreased even if the optical disk is rotated at high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking servo device for an optical disk drive device.

[0002]

2. Description of the Related Art In an optical disk drive device for recording and / or reproducing information by irradiating a laser beam as a light spot on an optical disk from a pickup, a tracking servo for maintaining the light spot at the center of a track on the optical disk. The device is used.

This tracking servo device maintains the light spot at the center of the track on the optical disk by closing the tracking servo loop, but before the tracking servo loop is closed, the light spot causes the light spot to cover the track on the optical disk. Cross several. From such a state, various improvements have been made to satisfactorily pull in the tracking servo. For example, when the pickup is moving from the center of the track to the center between the tracks, a tracking error in the tracking servo loop is generated. The tracking servo pull-in method, in which the signal is a positive phase signal and the tracking error signal in the tracking servo loop is a negative phase signal while the pickup is moving from the center between tracks to the center of the track, is fair. No. 21552.

Further, in a state where the tracking servo loop is closed, various improvements have been made in order to reduce a tracking servo error which is repeatedly caused by the rotation of the optical disk due to the eccentricity of the track and the like. Is extracted to obtain a correction signal, and a tracking servo error which is repeatedly generated due to the eccentricity of the track or the like according to the rotation of the optical disc is corrected by the correction signal.

For example, Japanese Examined Patent Publication No. 4-10145 discloses a disk file servo control system for rapidly reducing a tracking servo error having a repeatability which occurs according to disk rotation. In this disk file servo control system, in detail, the servo information is read from the disk by the head, a head position error is generated from this servo information, a control signal is generated from this head position error, and a head is generated in response to this control signal. In a disk file in which is located on the center of the track, a group of tap weights is calculated from the sample of head position error, trigonometric function value, and learning speed coefficient, and each tap weight in the group is summed to obtain a repeatability error correction signal. Occurs and adds this repetitive error correction signal to the control signal.

[0006]

In recent years, in the optical disk drive device, it is required to improve the recording / reproducing speed of information per unit time. Therefore, it is necessary to increase the rotation speed of the optical disk. Has occurred. Before the tracking servo loop is closed, the light spot crosses several tracks due to eccentricity of the track, etc., but the relative speed of the light spot and the track in the radial direction of the optical disc is
Even if the track eccentricity is the same, the track eccentricity increases in proportion to the number of rotations of the optical disk.

Therefore, in the conventional optical disk drive apparatus, when the number of rotations of the optical disk is increased, the tracking servo pull-in failure is likely to occur, the frequency of retries increases, and the operation speed of the apparatus decreases as a result. There is a problem of doing.

Further, after the tracking servo is pulled in, when the correction device reduces the tracking servo error having the repeatability which occurs due to the rotation of the optical disk due to the eccentricity of the track or the like, the correction device repeats the tracking servo error. It is necessary to maintain the tracking state at least without the correction signal for reducing the tracking servo error until the components are extracted to obtain the correction signal.

However, in the conventional optical disk drive device, when the number of rotations of the optical disk is increased, the tracking error increases until the correction device obtains a correction signal, the tracking state cannot be maintained, and a track deviation occurs. In some cases, the frequency of retries increases until the correction device is properly operated, and as a result, the operation speed of the device decreases.

According to the present invention, the above-mentioned drawbacks are improved, and the tracking servo can be quickly pulled in even when the optical disk rotation speed at the time of recording and / or reproducing information is increased, and the optical disk rotation speed is increased. It is an object of the present invention to provide a tracking servo device for an optical disk drive device, which can quickly reduce a tracking servo error having a repeatability depending on the above.

[0011]

In order to achieve the above object, an invention according to claim 1 is an optical disk drive having a spindle motor for rotationally driving an optical disk, and a pickup for irradiating a track on the optical disk with a light spot. In a tracking servo device of the apparatus, a tracking servo loop for maintaining the light spot on the track of the optical disc, and a rotation for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed. Number switching means, opening / closing means for opening / closing the tracking servo loop, and the rotation speed switching means for switching the rotation speed of the spindle motor to the first rotation speed to close the tracking servo loop in the opening / closing means. After that, the rotation speed switching means is caused to rotate the rotation speed of the spindle motor. It is obtained by a tracking servo pull-in means to switch to the second speed. According to a second aspect of the present invention, there is provided a tracking servo device of an optical disk drive device, comprising: a spindle motor that rotationally drives the optical disk; and a pickup that irradiates a track on the optical disk with the light spot. Tracking servo loop for maintaining the rotation speed of the spindle motor, rotation speed switching means for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed, and this rotation speed switching means for changing the rotation speed of the spindle motor. A control signal in the tracking servo loop is detected in a state in which the rotation speed is switched to the first rotation speed, and a correction signal is generated based on the control signal. The correction signal is changed to the tracking speed by changing the rotation speed to the first rotation speed. It is obtained by a correction means for adding in Borupu.

According to a third aspect of the present invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means is provided in the tracking servo loop when the rotational speed of the spindle motor is the first rotational speed. A control signal is detected, and a correction signal is generated based on the control signal when the rotation speed of the spindle motor is the second rotation speed, and the correction signal is generated using the first rotation speed and the second rotation speed. It is multiplied by a coefficient based on the ratio to the rotation speed.

According to a fourth aspect of the present invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means determines the rotation angle of the optical disc when the rotation number of the spindle motor is the first rotation number. Correspondingly, a control signal in the tracking servo loop is detected, and a correction signal when the number of rotations of the spindle motor is the second number of rotations is detected based on the control signal in correspondence with the rotation angle of the optical disc. It occurs.

According to a fifth aspect of the present invention, in the tracking servo apparatus of the optical disc drive apparatus according to the second aspect, the correction means is in the tracking servo loop when the rotation speed of the spindle motor is the first rotation speed. The control signal is detected, and a frequency component that is an integral multiple of the optical disk rotation speed including the fundamental frequency component of the optical disk rotation speed is extracted from this control signal to generate a correction signal.

[0015]

According to the first aspect of the present invention, the optical disk is rotated and driven by the spindle motor, and the pickup irradiates a track on the optical disk with a light spot. The tracking servo loop maintains the light spot on the track of the optical disk, and the rotation speed switching means switches the rotation speed of the spindle motor between the first rotation speed and the second rotation speed. The tracking servo loop is opened / closed by the opening / closing means. The tracking servo pull-in means causes the rotation speed switching means to switch the rotation speed of the spindle motor to the first rotation speed, causes the opening / closing means to close the tracking servo loop, and thereafter causes the rotation speed switching means to change the rotation speed of the spindle motor to the first rotation speed. Switch to 2 rpm. Therefore, the tracking servo is stably pulled in, and the operation speed does not decrease due to the retry.

According to a second aspect of the present invention, the optical disk is rotated by a spindle motor, and the pickup irradiates a track on the optical disk with a light spot. The tracking servo loop keeps the light spot on the track of the optical disc, and the rotation speed switching means switches the rotation speed of the spindle motor between the first rotation speed and the second rotation speed which is higher. The correction means detects the control signal in the tracking servo loop in a state where the rotation speed switching means switches the rotation speed of the spindle motor to the first rotation speed, generates a correction signal based on this control signal, and thereafter, The rotation speed switching means switches the rotation speed of the spindle motor to the first rotation speed and adds the correction signal to the tracking servo loop. Therefore, when the correction means detects the control signal in the tracking servo loop, the tracking servo error does not become excessive and the track is not deviated, the tracking servo pull-in is stably performed, and the operation speed by the retry is performed. Does not decrease.

According to a third aspect of the present invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means outputs the control signal in the tracking servo loop when the rotation speed of the spindle motor is the first rotation speed. A detection signal is generated based on this control signal when the rotation speed of the spindle motor is the second rotation speed, and the correction signal is based on the ratio between the first rotation speed and the second rotation speed. It is multiplied by the coefficient. Therefore, as in the second aspect of the invention, when the correction means detects the control signal in the tracking servo loop, the tracking servo error does not become excessive and the track is not deviated, and the tracking servo pull-in is stable. The operation speed does not decrease due to the retry.

According to a fourth aspect of the invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means corresponds to the rotation angle of the optical disc when the rotation number of the spindle motor is the first rotation number. A control signal in the tracking servo loop is detected, and a correction signal when the rotation speed of the spindle motor is the second rotation speed is generated based on this control signal in correspondence with the rotation angle of the optical disk. Therefore, as in the second aspect of the invention, when the correction means detects the control signal in the tracking servo loop, the tracking servo error does not become excessive and the track is not deviated, and the tracking servo pull-in is stable. The operation speed does not decrease due to the retry.

According to a fifth aspect of the present invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means outputs the control signal in the tracking servo loop when the rotation speed of the spindle motor is the first rotation speed. A detection signal is generated from this control signal, and a frequency component that is an integral multiple of the optical disc rotation speed including the fundamental frequency component of the optical disc rotation speed is extracted to generate a correction signal. Therefore, even when the optical disc rotation speed at the time of recording and / or reproducing information is increased, it is possible to quickly reduce the tracking servo error having the repeatability that occurs according to the rotation speed of the optical disc, and to provide a stable tracking servo. The state is obtained, and the recording and reproducing speed of information is improved.

[0020]

FIG. 1 shows an embodiment of the present invention. The optical disc 1 is rotationally driven by a spindle motor 2, and the number of revolutions of the spindle motor 2 is the spindle motor control circuit (S
PC) 3. The spindle motor control circuit 3 controls the rotation speed of the spindle motor 2 in two stages, that is, a first rotation speed and a second rotation speed, in response to a rotation speed switching signal from a microcontroller (MCU) 4. The first rotation speed is a smaller value than the second rotation speed, and when the spindle motor is rotating at the first rotation speed, tracking servo error having tracking servo pull-in and repeatability as will be described later. The tracking actuator drive signal is detected in order to obtain a correction signal for reducing Further, when the spindle motor is rotating at the second rotation speed, the tracking servo loop operates in the state where the correction signal is applied as described later, and recording and reproduction of information with respect to the track on the optical disc 1 are performed. .

The pickup 5 irradiates the laser beam focused from the objective lens 6 toward the optical disc 1 to form a light spot on the optical disc 1. The laser beam reflected by the optical disk 1 returns to the pickup 5 via the objective lens 6 again, and is received by the photodetector 7 to detect its light amount. Detection amplifier (DETAMP) 8
Amplifies the output signal of the photodetector 7 and detects a tracking error signal TE indicating the deviation of the light spot from the track center and a reproduction data signal RD corresponding to the data recorded on the track of the optical disc 1.

The tracking servo loop includes a photo detector 7, a detection amplifier 8, a switch (SW) 9, a phase compensation circuit (CMP) 10, an adder 11 and a power amplifier (P
A) 12 and a tracking actuator 13, and the MCU 4 opens and closes the tracking servo loop by opening and closing SW 9. When the microcontroller 4 pulls in the tracking servo, FIG.
In step 201 shown in (1), the spindle motor control circuit 3 is caused to switch the rotation speed of the spindle motor 2 to the first frequency (LOW). With the rotation speed of the spindle motor 2 maintained at the first frequency, the microcontroller 4 closes the switch 9 to close and turn on the tracking servo loop in step 202 shown in FIG.

The tracking error signal TE from the detection amplifier 8 is phase-compensated by the phase compensation circuit 10 and then power-amplified by the power amplifier 12 via the adder 11 and supplied to the tracking actuator 13 to cause the tracking actuator 13 to operate. The objective lens 6 is moved substantially in the radial direction of the optical disc 1. As a result, the tracking servo is pulled in and the light spot is placed on the track of the optical disc 1. As described above, in this embodiment, the spindle motor 2 rotates at the first rotation speed that is set lower than the second rotation speed that is the rotation speed of the spindle motor 2 when recording and reproducing information. Since the tracking servo is pulled in during the operation, the tracking servo is pulled in very stably.

After the pulling-in of the tracking servo is completed, the microcontroller 4 operates, for example, on the optical disc 1.
While the spindle motor control circuit 3 keeps the number of revolutions of the spindle motor 2 at the first number of revolutions for one revolution of the above, the output signal of the analog / digital converter (AD) 14 is output to each predetermined optical disc 1. The data is sampled according to the rotation angle and stored in the memory (MEM) 15. Here, the analog / digital converter 14 is the phase compensation circuit 10
Is converted into a digital signal, and this digital signal corresponds to the drive signal of the tracking actuator 13.

The track on the optical disk 1 is divided into a fixed number of sectors per revolution, and a sector address is recorded in advance in each ID of each sector. The address detection circuit (ADRDET) 16 detects the sector address from the reproduction data signal RD from the detection amplifier 8 and outputs it to the microcontroller 4. Micro controller 4
In step 203 shown in FIG. 3, the tracking actuator corresponding to each predetermined rotation angle of the optical disc 1 is sampled by sampling the output signal of the analog / digital converter 14 by the output signal of the address detection circuit 16 corresponding to each sector address. The drive signal 13 is sampled. In this case, the microcontroller 4 samples the analog / digital conversion value of the analog / digital converter 14 by the sector address detection of the address detection circuit 16 and stores it in the memory 15 as shown in FIG.

FIG. 2A is a schematic diagram showing the temporal relationship between the output signal of the phase compensation circuit 10, the sector address detected by the address detection circuit 16 and the sampling point. During such initial sampling (for example, during the time when the optical disc 1 makes one rotation after pulling in the tracking servo), the tracking servo loop is not given a special correction signal, and the repeatability caused by the track eccentricity or the like is generated. The tracking error that it has is not corrected.

However, in this embodiment, the spindle motor 2 rotates at the first rotation speed set lower than the second rotation speed which is the rotation speed of the spindle motor 2 when recording and reproducing information. Since the tracking servo is pulled in while the tracking error is occurring, the tracking error becomes excessive while the microcontroller 4 is sampling the output signal of the analog / digital converter (AD) 14, and the light spot deviates from the track. The problem of being lost is gone.

The microcontroller 4 calculates a correction signal to be given to the tracking servo loop based on the sampling value stored in the memory 15 in accordance with a predetermined rotation angle of the optical disc 1. It is assumed that the tracking error having repeatability to be corrected is only the fundamental frequency component of the rotation speed of the optical disc 1, for example. The microcontroller 4 is shown in FIG.
The amplitude and phase of the fundamental frequency component of the rotation speed of the optical disc 1 are analyzed by Fourier analysis of the sampling value stored in the memory 15 in step 204 shown in FIG. The correction value of is calculated according to the rotation angle of the optical disk 1 and the memory 1
Store in 5.

In this case, the microcontroller 4 is shown in FIG.
As shown in, CS and SN are cleared to 0 and CS ← CS +
cos (2πA / N) × C (A), SN ← SN + sin (2πA /
N) × C (A) for A = 0 to N−1, and then CS ← CS / N × 2, SN ← CS / N × 2, and D (A) ← CS × cos (2πA / N) ＋ sin
The fundamental frequency component is extracted by Fourier analysis by performing the operation (2πA / N) for A = 0 to N−1. Further, the microcontroller 4 determines that the amplitude D (A) of the correction value has the first rotational speed n1 and the second rotational speed n1.
The coefficient (n2 / n1) ² is multiplied based on the ratio with n2. This is because the track shake acceleration due to track eccentricity increases in proportion to the square of the rotation speed of the optical disc 1. That is, the microcontroller 4 also multiplies the amplitude of the correction value by a coefficient to obtain the sampling value of the output signal of the analog / digital converter (AD) 14 when the spindle motor 2 is rotating at the first rotation speed. In addition, a correction value to be given to the tracking servo loop when the spindle motor 2 is rotating at the second rotation speed is calculated.

When the calculation of the correction value is completed, the microcontroller 4 causes the spindle motor control circuit 3 to switch the rotation speed of the spindle motor 2 to the second rotation speed (HIGH) in step 205 shown in FIG. At the same time, in step 206 shown in FIG. 3, the microcontroller 4 reads a correction value from the memory 15 corresponding to the sector address detected by the address detection circuit 16 as shown in FIG. ) Set to 17. Digital/
The analog converter 17 outputs a correction signal proportional to the correction value set by the microcontroller 4 to the adder 11, and the correction signal is added to the output signal of the phase compensation circuit 10 by the adder 11 to obtain the tracking actuator 13.
Drive signal.

FIG. 2C shows the address detection circuit 16 when the spindle motor 2 is rotating at the second speed.
FIG. 3 is a schematic diagram showing a temporal relationship between a sector address detected by and a correction signal given to a tracking servo loop corresponding to the sector address. Figure 2 (b)
Is a reference diagram and shows a state of a correction signal to be given to the tracking servo loop when the spindle motor 2 is rotating at the first rotation speed.

As can be seen from the comparison of FIGS. 2B and 2C, in this embodiment, the tracking actuator sampled corresponding to the rotation angle of the optical disk 1 when the spindle motor 2 is rotating at the first rotation speed. Based on the drive signal, a correction signal corresponding to the rotation angle of the optical disc 1 based on the ratio between the first rotation speed and the second rotation speed when the spindle motor 2 is rotating at the first rotation speed. And give it to the tracking servo loop.

A tracking servo error having repeatability caused by track eccentricity or the like is greatly reduced by the correction signal, and tracking servo is stably performed.
In this state, the laser beam focused from the pickup 5 toward the optical disc 1 through the objective lens 6 is irradiated to record / reproduce information on / from a track on the optical disc.

Further, in the above-mentioned embodiment, the microcontroller 4 analyzes the sampling value stored in the memory 15 by Fourier analysis to analyze the amplitude and phase of the fundamental frequency component of the rotation speed of the optical disk 1, and based on the amplitude and phase. The correction value of the sine wave shape to be given to the tracking servo loop is calculated corresponding to the rotation angle of the optical disc 1 and stored in the memory 15. However, the sampling value stored in the memory 15 is Fourier-analyzed and The amplitude and phase of a frequency component that is an integral multiple of the rotation speed of the optical disc 1 including the fundamental frequency component is analyzed, and a sinusoidal correction value to be given to the tracking servo loop is set as the rotation angle of the optical disc 1 based on the amplitude and phase. Corresponding calculations may be performed and stored in the memory 15. By doing so, even if the number of revolutions of the optical disc at the time of recording and / or reproducing information is increased, it is possible to quickly reduce the tracking servo error having the repeatability that occurs depending on the number of revolutions of the optical disc, and it is stable. A stable tracking servo state can be obtained, and information recording / reproducing speed is improved.

[0035]

As described above, according to the first aspect of the present invention, the tracking servo device of the optical disk drive device having the spindle motor for rotationally driving the optical disk and the pickup for irradiating the track on the optical disk with the light spot. A tracking servo loop for maintaining the light spot on the track of the optical disc, and a rotation speed switching means for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed. An opening / closing means for opening / closing the tracking servo loop, and the rotation speed switching means for switching the rotation speed of the spindle motor to the first rotation speed to cause the opening / closing means to close the tracking servo loop, and thereafter, The rotation number of the spindle motor is set to the second rotation number by the rotation number switching means. Since the spindle motor is rotated at the second rotation speed, information is recorded and / or reproduced when the spindle motor rotates at the second rotation speed, so that the spindle motor operates at the first rotation speed lower than the second rotation speed. By pulling in the tracking servo when rotating, it is possible to stably pull in the tracking servo, and there is no reduction in operating speed due to retries.

According to a second aspect of the present invention, in the tracking servo device of the optical disk drive device, which has a spindle motor for rotationally driving the optical disk and a pickup for irradiating a track on the optical disk with the light spot, A tracking servo loop for maintaining on the track of the optical disc;
Rotation speed switching means for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed, and the rotation speed switching means for setting the rotation speed of the spindle motor to the first rotation speed.
The control signal in the tracking servo loop is detected in a state in which the rotation speed is switched to the rotation speed, and a correction signal is generated based on the control signal. Since the correction means for switching the number of rotations to add the correction signal to the tracking servo loop is provided, the tracking servo error becomes excessive when the correction means detects the control signal in the tracking servo loop. Therefore, the tracking servo can be stably pulled in without the occurrence of a track deviation, and the operation speed does not decrease due to the retry. Therefore, even if the optical disc rotation speed at the time of recording and / or reproducing information is increased, the tracking servo can be quickly pulled in, and further, the tracking servo having the repeatability that occurs depending on the optical disc rotation speed. The error can be quickly reduced.

According to a third aspect of the present invention, in the tracking servo device of the optical disc drive apparatus according to the second aspect, the correction means includes the tracking servo loop when the rotational speed of the spindle motor is the first rotational speed. A control signal is detected, and a correction signal is generated based on the control signal when the rotation speed of the spindle motor is the second rotation speed, and the correction signal is generated by the first rotation speed and the first rotation speed. Since it is multiplied by a coefficient based on the ratio to the rotation speed of 2, the same effect as the invention of claim 2 is obtained.

According to the invention described in claim 4, in the tracking servo device of the optical disk drive device according to claim 2, the correction means rotates the optical disk when the rotation speed of the spindle motor is a first rotation speed. The control signal in the tracking servo loop is detected corresponding to the angle, and the correction signal when the rotation speed of the spindle motor is the second rotation speed is corresponding to the rotation angle of the optical disk based on the control signal. Therefore, it occurs, so that
The same effect as the described invention is obtained.

According to a fifth aspect of the present invention, in the tracking servo apparatus of the optical disc drive apparatus according to the second aspect, the correction means performs the tracking servo when the rotation speed of the spindle motor is the first rotation speed. Since a control signal in the loop is detected and a frequency component that is an integral multiple of the optical disc rotation speed including the fundamental frequency component of the optical disc rotation speed is extracted from the control signal to generate a correction signal, recording and / or recording of information is performed. Even if the number of revolutions of the optical disc during reproduction is increased, it is possible to quickly reduce the tracking servo error having the repeatability that occurs depending on the number of revolutions of the optical disc, and obtain a stable tracking servo state. Playback speed is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the present invention.

FIG. 3 is a flowchart showing a processing flow of the microcontroller in the above embodiment.

FIG. 4 is a flowchart showing in detail a part of a processing flow of the same microcontroller.

FIG. 5 is a flowchart showing in detail another part of the processing flow of the same microcontroller.

FIG. 6 is a flowchart showing in detail another part of the processing flow of the same microcontroller.

[Explanation of symbols]

 1 Optical Disk 2 Spindle Motor 3 Spindle Motor Control Circuit 4 Microcontroller 5 Pickup 7 Photodetector 8 Detection Amplifier 9 Switch 11 Adder 13 Tracking Actuator 16 Address Detection Circuit

Claims (5)

[Claims] 1. A tracking servo device of an optical disk drive device, comprising: a spindle motor for rotationally driving an optical disk; and a pickup for irradiating a track on the optical disk with a light spot, wherein the optical spot is maintained on the track of the optical disk. Tracking servo loop, a rotation speed switching means for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed, an opening / closing means for opening / closing the tracking servo loop, and the rotation speed. The switching means switches the rotation speed of the spindle motor to the first rotation speed, the opening / closing means closes the tracking servo loop, and then the rotation speed switching means changes the rotation speed of the spindle motor to the first rotation speed. Tracking servo pull-in means to switch to 2 rpm Tracking servo apparatus for an optical disc drive and wherein the was e. 2. A tracking servo device of an optical disk drive device, comprising: a spindle motor for rotationally driving an optical disk; and a pickup for irradiating a track on the optical disk with a light spot, for maintaining the light spot on the track of the optical disk. Tracking servo loop for controlling the rotation speed, rotation speed switching means for switching the rotation speed of the spindle motor between a first rotation speed and a second rotation speed higher than the first rotation speed, and the rotation speed switching means for setting the rotation speed of the spindle motor. A control signal in the tracking servo loop is detected in a state where the rotation speed is switched to the first rotation speed, and a correction signal is generated based on this control signal, and thereafter, the rotation speed of the spindle motor is set to the rotation speed switching means. The correction signal is switched to the first rotation speed to output the tracking servo loop. Tracking servo apparatus for an optical disc drive apparatus being characterized in that a correcting means for adding to. 3. The tracking servo device of the optical disk drive device according to claim 2, wherein the correction means detects a control signal in the tracking servo loop when the rotation speed of the spindle motor is a first rotation speed. Based on this control signal, a correction signal is generated when the rotation speed of the spindle motor is the second rotation speed, and the correction signal is a ratio of the first rotation speed to the second rotation speed. A tracking servo device for an optical disk drive device, wherein the tracking servo device is multiplied by a coefficient based on the above. 4. The tracking servo device of the optical disk drive device according to claim 2, wherein the correction means corresponds to the rotation angle of the optical disk when the rotation speed of the spindle motor is a first rotation speed. A control signal in a loop is detected, and a correction signal when the number of rotations of the spindle motor is the second number of rotations is generated based on the control signal in correspondence with the rotation angle of the optical disc. Tracking servo device for optical disk drive device. 5. The tracking servo device of the optical disk drive device according to claim 2, wherein the correction means detects a control signal in the tracking servo loop when the rotation speed of the spindle motor is the first rotation speed. A tracking servo device for an optical disk drive device, which extracts a frequency component, which is an integral multiple of the optical disk rotation speed, including a fundamental frequency component of the optical disk rotation speed, from a lever control signal to generate a correction signal.