JP2001160226A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the direction and magnitude of eccentricity in a short time from tracking drive having large noise components caused by the eccentricity and to detect eccentricity compensation residual without adding a sensor. SOLUTION: Only the magnitude and direction of optical disk rotational frequency components of the eccentricity are detected from tracking drive signals by orthogonal heterodyne detection (a frequency detector 63) so as to generate sine wave eccentricity compensation signals (a sine wave generator 64, a phase compensator 65 and a gain compensator 66). Moreover, in an eccentricity driving applied condition, the magnitude and the direction of only optical disk rotational frequency components of eccentricity compensation residual are detected by the orthogonal heterodyne detection and eccentricity compensation driving is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating disk-shaped information carrier (hereinafter referred to as an "optical disk") having a track composed of pits or guide grooves, which allows a light beam to accurately follow the eccentricity of the track. The present invention relates to an optical disk device having a tracking control function.

[0002]

2. Description of the Related Art In a conventional optical disk apparatus, a signal is reproduced by irradiating a relatively weak light beam of a constant light amount onto an optical disk and detecting reflected light that is strongly modulated by the optical disk. In signal recording, information is written on a recording material film on an optical disk by modulating the light intensity of an optical beam depending on the signal to be recorded.
No. 0802).

[0003] In a read-only optical disk, information by pits is recorded in a spiral form in advance. Also,
The recordable and reproducible optical disk is manufactured by forming an optically recordable and reproducible material film on a surface of a substrate having a track having a spiral uneven structure by a method such as vapor deposition. In order to record information on the optical disk or to reproduce the recorded information, the normal direction of the surface of the optical disk so that the light beam always has a predetermined convergence state on the recording material film.
It is necessary to perform focus control for performing control in a focus direction (hereinafter, referred to as a focus direction) and tracking control for performing control in a radial direction of the optical disc (hereinafter, referred to as a tracking direction) so that a light beam is always positioned on a predetermined track.

FIG. 1 shows a conventional optical disk search operation.
This will be described with reference to FIG. The optical head 10 includes a semiconductor laser 11, a coupling lens 12, a polarizing beam splitter 13, a quarter-wave plate 14, and a focus actuator 1.
6, tracking actuator 17, detection lens 1
8, a cylindrical lens 19 and a photodetector 20 are attached. The light beam generated by the semiconductor laser 11 is converted into parallel light by the coupling lens 12, passes through the polarization beam splitter 13 and the 波長 wavelength plate 14, and is focused on the disc-shaped optical disc 1 by the focusing lens 15. .

The light beam reflected therefrom is condensed by a condenser lens 1.
The light passes through the 、 -wavelength plate 14 again, is reflected by the polarization beam splitter 13, passes through the detection lens 18 and the cylindrical lens 19, and irradiates the photodetector 20 divided into four. The condenser lens 15 is supported by an elastic body, and moves in a focusing direction by an electromagnetic force when a current flows through the focus actuator 16, and moves in a tracking direction when a current flows through the tracking actuator 17. The photodetector 20 sends the detected light amount signal to a focus error generator 30 (hereinafter, referred to as an FE generator 30) and a tracking error generator 40 (hereinafter, referred to as a TE generator 40).

The FE generator 30 calculates an error signal (hereinafter, referred to as an FE signal) indicating a convergence state of the light beam on the information surface of the optical disk 1 by using the light amount signal from the photodetector 20, and uses the signal for focusing. Filter 31 (hereinafter Fc filter 3)
1) to the focus actuator 16. The focus actuator 16 controls the condenser lens 15 in the focus direction so that the light beam converges on the recording surface of the optical disc 1 in a predetermined state. This control is the focus control.

The TE generator 40 calculates an error signal (hereinafter referred to as a TE signal) indicating a positional relationship between a light beam and a track on the optical disk 1 using the light amount signal from the photodetector 20, and a tracking filter 41. (Hereinafter Tk filter 4
1) and to the tracking actuator 17 via the adder 42. Tracking actuator 17
Is a condenser lens 1 so that the light beam follows the track.
5 in the tracking direction. This control is tracking control.

[0008] The drive signal from the Tk filter 41 is sent to the eccentric memory 60. The motor 50 rotates the optical disk 1 and sends 1000 encoder pulses per rotation to the rotation phase output unit 51. The rotation phase output unit 51 counts the rising edge of the encoder pulse from the motor 50, and when the number of 1000 pulses corresponding to one rotation is counted, clears the count value to 0 and sends the rotation phase information obtained to the eccentric memory 60. . The eccentricity correction command unit 62 sends a command signal to the eccentricity memory 60.

When the command signal from the eccentricity correction command unit 62 is at a high level, the eccentricity memory 60
The signal from 1 is stored in the address corresponding to the rotation phase information from the rotation phase output unit 51, and 0 is continuously sent to the low-pass filter 61. When the command signal from the eccentricity correction command device 62 is at a low level, the eccentricity memory 60 stores the value stored at the address based on the rotation phase information from the rotation phase output device 51 via the low-pass filter 61. To the adder 42. The adder 42 adds the signal from the Tk filter 41 and the signal from the low-pass filter 61 and sends the signal to the tracking actuator 17.

The operation will be described with reference to FIG. FIG.
1 shows the rotational phase information from the rotational phase output unit 51, and FIG.
7b shows a command signal from the eccentricity correction command device 62, and FIG.
7c shows a signal from the low-pass filter 61. FIG.
Before t0, the state in which the eccentricity correction is not working is shown. From t0 to t1, the state in which the eccentricity correction learning is performed is shown.
The numbers 1 and after indicate that the eccentricity correction is working. The eccentricity memory 60 stores the signal from the Tk filter 41 at an address based on the rotation phase information shown in FIG. 17A from t0 to t1.

At time t1, the eccentricity correction drive for one rotation of the optical disk is stored in the eccentricity memory 60. After t1, the eccentricity memory 60 outputs the stored eccentricity correction drive and passes it through the low-pass filter 61, whereby a drive waveform as shown in FIG. 17C can be obtained. In addition to the normal tracking control, the tracking actuator 17 accurately follows the track eccentricity because a drive waveform for following the eccentricity shown in FIG. 17C is further applied.

The measurement for generating the eccentricity correction drive can use not only the signal from the Tk filter 41 in the tracking control state but also the TE generator 40 in the tracking non-control state (Japanese Patent Laid-Open No. 3-27203).
0).

[0013]

The eccentricity is caused by a shift in the center of rotation or a track undulation, but most of the eccentricity is caused by a shift in the center of rotation. This rotation center shift component has only the optical disk rotation frequency component.

In the case where the tracking control is performed, the main component is corrected by the eccentricity correction, so that the track can be accurately followed. When recording the signal waveform in the eccentric memory 60, the recording result is affected by noise or the like. As shown in the left diagram of FIG. 18A, components other than the rotation frequency component of the optical disc are generally included. Therefore, the recording result of the eccentric memory 60 has an error with respect to the target sine wave as shown in the right diagram of FIG. have. In order to remove such an error, there is a method of recording the data in the eccentricity memory 60 for two or more rotations and averaging the data. However, there is a problem that the measurement time becomes long.

When the tracking control is not mainly performed, the variation in the tracking direction due to the eccentricity correction drive has a predetermined gain and a predetermined phase delay due to the transmission characteristics of the tracking actuator 17. for that reason,
The variation in the tracking direction of the condenser lens 15 caused by the drive for correcting the eccentricity has an error with respect to the eccentricity. In order to suppress this correction error, a method of measuring the deviation of the tracking direction of the lens 15 from the eccentricity correction drive using a sensor that detects the absolute position of the lens 15 in the tracking direction and correcting the eccentricity correction drive However, there is a problem that the number of parts is increased and the cost is increased because a sensor is used.

The rotation phase information from the rotation phase output unit 51 is generated based on the start of rotation. If the optical disk device goes into a sleep state once without access for a long time to reduce power consumption, power to the motor 50 and the rotary phase output device 51 is also cut off during that time, and the rotary phase output device 5 is turned off.
The reference of the rotation transfer information output from 1 changes. The eccentricity correction drive adjusted before the sleep state has a problem that when the reference of the rotation phase information from the rotation phase output device 51 changes after the sleep state, the phase is changed, so that it cannot be used and must be readjusted. is there.

[0017]

In order to solve the above problems, the present invention provides a TE signal detecting means for detecting a displacement between a light beam and a track of an optical disc, and a TE signal from the TE signal detecting means. Tracking control means for controlling a light beam to follow a track, a rotation number measuring means for measuring the number of rotations of an optical disc, a signal from a TE signal detecting means, and a measured rotation number from the rotation number measuring means. Eccentricity measuring means for measuring the magnitude and direction of eccentricity with respect to the rotation phase of the optical disk, and eccentricity correcting means for generating tracking drive based on the magnitude and direction of eccentricity from the eccentricity measuring means. It is a thing.

The present invention also provides a TE signal detecting means for detecting a displacement between a light beam and a track on an optical disk;
Tracking control means for controlling the light beam to follow the track based on the TE signal from the E signal detection means; rotation number measurement means for measuring the rotation number of the optical disc; drive signal from the tracking control means; Eccentricity measuring means for measuring the magnitude and direction of the eccentricity with respect to the rotation phase of the optical disk based on the number of rotations measured from the number measuring means, and tracking drive based on the magnitude and direction of the eccentricity from the eccentricity measuring means Is provided.

The present invention also provides a TE signal detecting means for detecting a displacement between a light beam and a track of an optical disk;
Tracking control means for controlling the light beam to follow the track based on the TE signal from the E signal detection means; address detection means for detecting the address of the information carrier irradiated by the light beam; A rotation phase measuring means for determining the reference of the rotation phase from the address and measuring the rotation phase of the optical disk.

The present invention also provides a TE signal detecting means for detecting a displacement between a light beam and a track on an optical disk;
Tracking control means for controlling a light beam to follow a track based on a TE signal from an E signal detection means, and detecting a switching point from a concave part to a convex part or from a convex part to a concave part in a track groove of an optical disk. A switching point detecting means is provided, and a rotating phase measuring means for measuring a rotating phase of the optical disc by obtaining a reference of the rotating phase from the detected switching point position is provided.

The present invention also provides a TE signal detecting means for detecting a displacement between a light beam and a track of an optical disk;
Tracking control means for controlling the light beam to follow the track based on the TE signal from the E signal detection means; disturbance detection means for measuring the disturbance of the rotational phase information of the optical disc; and disturbance of the detected rotational phase And a rotation phase measuring means for measuring the rotation phase of the optical disk by determining the reference of the rotation phase from the optical disk.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a block diagram of an optical disk apparatus according to Embodiment 1. In FIG. 1, the same components as those of FIG. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64. The sine wave generator 64 converts a sine wave having the same frequency as the optical disk rotation frequency based on the rotation phase information from the rotation phase output unit 51 into a phase corrector 65.
And the same signal is sent to the frequency detector 63 via the gain corrector 66 to the adder 42. Eccentricity correction command device 6
2 sends a command signal to the frequency detector 63.

When the command signal from the eccentricity correction command device 62 is at a high level, the frequency detector 63 detects the Tk filter 4 based on the frequency of the sine wave from the sine wave generator 64.
The drive signal from 1 is detected to obtain the magnitude and phase, and during that time, 0 is sent to the phase corrector 65 and the gain corrector 66. When the command signal from the eccentricity correction command device 62 is at a low level, the frequency detector 63 sends the obtained gain information and phase information to the gain corrector 66 and the phase corrector 65, respectively. The initial values of the gain information and the phase information of the frequency detector 63 are 0.

The phase corrector 65 changes the phase of the sine wave from the sine wave generator 64 based on the phase information from the frequency detector 63. The gain corrector 66 is a frequency detector 6
3, the gain of the sine wave from the phase corrector 65 is changed. The adder 42 adds the signal from the gain corrector 66 and the signal from the Tk filter 41 and sends the result to the tracking actuator 17.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

Since the main component of the eccentricity is the rotation frequency of the optical disk, the drive signal from the Tk filter 41 also has the same frequency component, and the magnitude and direction of the drive signal are equal to the sine wave of the same frequency sent from the sine wave generator 64. The frequency is detected by the frequency detector 63 using this. FIG. 3 shows details of the frequency detector 63. FIG.
The middle waveform input indicates the Tk filter 41, the command input indicates the eccentricity correction command device 62, and the gain output indicates the gain corrector 6
6 and the phase output indicates a phase corrector 65. The signal from the sine wave generator 64 is sent to the multiplier 81 and the phase delay unit 80. The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends the delayed signal to the multiplier 82. The signal from the Tk filter 41 is sent to the multipliers 81 and 82.

A command signal from the eccentricity correction command unit 62 is sent to an integrator 83 and an integrator 84. The multiplier 81 multiplies the signal from the sine wave generator 64 by the signal from the Tk filter 41 and sends the result to the integrator 83. The multiplier 82 multiplies the signal from the phase delay unit 80 by the signal from the Tk filter 41, and sends the result to the integrator 84. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 83 integrates the signal from the multiplier 81 and sends the result to the coordinate converter 85.

When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 84 integrates the signal from the multiplier 82 and sends the result to the coordinate converter 85. When the command signal from the eccentricity correction command unit 62 is at a low level, the integrator 83 and the integrator 84 hold the integrated value and store the coordinate
Send to When the integrator 83 and the integrator 84 detect the rising edge of the command signal from the eccentricity correction command device 62, they clear the integrated value to zero. The coordinate converter 85 regards the integrated values from the integrators 83 and 84 as a rectangular coordinate expression, converts them into polar coordinates, and converts the gain information into a gain corrector 66.
And sends the phase information to the phase corrector 65.

The eccentricity correction command unit 62 outputs a command signal, which is normally at a low level, to perform eccentricity correction learning.
High level only for the time of rotation. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

With reference to the gain and phase of the signal from the sine wave generator 64, the integrated value of the integrator 83, which is the result of the operation using the signal from the sine wave generator 64, is The integral value of the integrator 84, which is a calculation result using a signal from the phase delay unit 80, indicates the real component of the magnitude of the optical disc rotation frequency component, and the integral value of the magnitude of the optical disc rotation frequency component in the signal from the Tk filter 41. Shows the imaginary component. By converting the real component and the imaginary component of the magnitude of the optical disk rotational frequency component in the signal from the Tk filter 41 by the coordinate converter 85, the magnitude and phase of the optical disk rotational frequency component in the signal from the Tk filter 41 can be obtained.

The signal from the sine wave generator 64 is phase corrected by the phase corrector 65 in accordance with the obtained phase information of the eccentricity correction drive, and the gain is corrected in accordance with the obtained gain information of the eccentricity correction drive. The gain is corrected by the unit 66. Thus,
A sinusoidal eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained. In this eccentricity correction drive, only the optical disk rotation frequency component is present, and the influence of noise and the like has been removed, so that accurate eccentricity correction can be performed.

(Embodiment 2) FIG. 4 shows a block diagram of an optical disk apparatus according to Embodiment 2 of the present invention. 4, the same components as those in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64 and the characteristic generator 70. The sine wave generator 64 sends a sine wave having the same frequency as the rotation frequency to the tracking actuator 17 via the phase corrector 65 and the gain corrector 66 based on the rotation phase information from the rotation phase output unit 51, and outputs the same signal. The signal is sent to the frequency detector 63. The eccentricity correction command device 62 sends a command signal to the frequency detector 63.

In the tracking non-control state, TE
The tracking error signal from the generator 40 is track 1
The waveform has one cycle for a book. The tracking error signal is binarized by the track cross generator 43 and sent to the track position detector 71. The track position detector 71 counts the rising edge of the track cross signal from the track cross generator 43, generates a track position by multiplying the track interval of the optical disc, and generates a track position.
Send to 3.

When the command signal from the eccentricity correction command device 62 is at a high level, the frequency detector 63 detects the track position from the track position detector 71 based on the frequency of the sine wave from the sine wave generator 64. The signal is detected to obtain the gain and the phase, and 0 is sent to the adder 68 and the multiplier 67 during the detection. When the command signal from the eccentricity correction command device 62 is at a low level, the frequency detector 63 uses the obtained gain information and phase information as a multiplier 67 and an adder 68, respectively.
Send to The initial values of the gain information and the phase information of the frequency detector 63 are 0.

The characteristic generator 70 has gain information and phase information of the reverse transfer characteristic of the tracking actuator 17, detects the rotational frequency from the rotational position information from the rotational phase output device 51, and obtains a gain corresponding to the obtained frequency. The information and the phase information are sent to the multiplier 67 and the adder 68, respectively.

Since the reverse transfer characteristic of the tracking actuator 17 indicates what drive signal can be obtained with respect to the tracking position signal, gain information and phase information for correcting the measured tracking position signal are obtained. .

A multiplier 67 multiplies the gain information from the frequency detector 63 and the characteristic generator 70 to obtain a gain corrector 66.
Send to The adder 68 adds the phase information from the frequency detector 63 and the characteristic generator 70 and sends the result to the phase corrector 65.

The phase corrector 65 changes the phase of the sine wave from the sine wave generator based on the phase information from the adder 68. The gain corrector 66 changes the gain of the sine wave from the phase corrector 65 based on the gain information from the multiplier 67 and sends it to the tracking actuator 17.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

Since the main component of the eccentricity is the rotation frequency of the optical disk, the track position signal from the track position detector 71 also has the same frequency component. The frequency is detected by the frequency detector 63 using the sine wave. FIG. 3 shows details of the frequency detector 63. The waveform input in FIG.
The command input indicates the eccentricity correction command device 62, the gain output indicates the multiplier 67, and the phase output indicates the adder 68.

The signal from the sine wave generator 64 is multiplied by a multiplier 81.
And to the phase delay unit 80. The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends the delayed signal to the multiplier 82. The track position signal from the track position detector 71 is sent to multipliers 81 and 82. The command signal from the eccentricity correction command unit 62 is transmitted to the integrator 83 and the integrator 8
Sent to 4. The multiplier 81 multiplies the signal from the sine wave generator 64 by the track position signal from the track position detector 71, and sends the result to the integrator 83. The multiplier 82 multiplies the signal from the phase delay unit 80 by the track position signal from the track position detector 71, and sends the result to the integrator 84.

When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 83 integrates the signal from the multiplier 81 and sends the result to the coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 84 integrates the signal from the multiplier 82 and sends the result to the coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a low level, the integrator 83 and the integrator 84 hold the integrated value and send it to the coordinate converter 85.

When detecting the rising edge of the command signal from the eccentricity correction command device 62, the integrators 83 and 84 clear the integrated value to zero. The coordinate converter 85 regards the integration values from the integrators 83 and 84 as a rectangular coordinate expression, converts the values into polar coordinates, sends the gain information to the multiplier 67, and sends the phase information to the adder 68.

The eccentricity correction command unit 62 outputs a command signal, which is normally at a low level, to perform eccentricity correction learning.
High level only for the time of rotation. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

When the gain and phase of the signal from the sine wave generator 64 are used as a reference, the integrated value of the integrator 83, which is the calculation result using the signal from the sine wave generator 64, is obtained from the track position detector 71. The integrated value of the integrator 84, which is a calculation result using the signal from the phase delay unit 80, indicates the real component of the magnitude of the rotation frequency component of the optical disk in the track position signal. The imaginary component of the magnitude of the optical disk rotation frequency component is shown.

The coordinate converter 85 converts a real component and an imaginary component of the rotation frequency component of the optical disk in the track position signal from the track position detector 71 so that the rotation of the optical disk in the track position signal from the track position detector 71 is performed. The magnitude and phase of the frequency component are obtained.

The characteristic generator 70 generates gain information and phase information of the reverse transfer characteristic of the tracking actuator 17 at the rotation frequency of the optical disk.

The gain information based on the tracking position signal from the frequency detector 63 is multiplied by the multiplier 67 with the gain information from the characteristic generator 70 to become the eccentricity correction drive gain information. The phase information based on the tracking position signal from the frequency detector 63 is added to the phase information from the characteristic generator 70 by the adder 68 to become the eccentricity correction drive phase information.

The signal from the sine wave generator 64 is phase corrected by the phase corrector 65 in accordance with the obtained phase information of the eccentricity correction drive, and the gain is corrected in accordance with the obtained gain information of the eccentricity correction drive. The gain is corrected by the unit 66. Thus,
A sinusoidal eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained. In this eccentricity correction drive, only the optical disk rotation frequency component is present, and the influence of noise and the like has been removed, so that accurate eccentricity correction can be performed.

(Embodiment 3) FIG. 5 shows a block diagram of an optical disk apparatus according to Embodiment 3 of the present invention. In FIG. 5, the same components as those in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64. The sine wave generator 64 sends a sine wave having the same frequency as the rotation frequency to the adder 42 via the phase corrector 65 and the gain corrector 66 based on the rotation phase information from the rotation phase output unit 51, and outputs the same signal. The signal is sent to the frequency detector 63 and the frequency detector 69.

The eccentricity correction command unit 72 sends separate command signals to the frequency detector 63 and the frequency detector 69, respectively.
When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 63 detects the drive signal from the Tk filter 41 based on the frequency of the sine wave from the sine wave generator 64 to obtain a gain. And a phase, during which the adder 68
And 0 to the multiplier 67.

The frequency detector 63 is an eccentricity correction command device 7
When the command signal from 2 is low level, the obtained gain information and phase information are sent to the multiplier 67 and the adder 68, respectively. The initial values of the gain information and the phase information of the frequency detector 63 are 0.

When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 69 detects the Tk filter 4 based on the frequency of the sine wave from the sine wave generator 64.
The drive signal from 1 is detected to obtain the gain and the phase. During that time, 0 is sent to the adder 68 and 1 is sent to the multiplier 67. When the command signal from the eccentricity correction command device 72 is at a low level, the frequency detector 69 sends the obtained gain information and phase information to the multiplier 67 and the adder 68, respectively.
The initial value of the gain information of the frequency detector 69 is 1, and the initial value of the phase information is 0.

The multiplier 67 multiplies the gain information from the frequency detector 63 and the frequency detector 69 by multiplying the gain information.
Send to 6. The adder 68 adds the phase information from the frequency detector 63 and the frequency detector 69 and sends the result to the phase corrector 65. The phase corrector 65 changes the phase of the sine wave from the sine wave generator 64 based on the phase information from the adder 68. The gain corrector 66 changes the gain of the sine wave from the phase corrector 65 based on the gain information from the multiplier 67. The adder 42 receives the signal from the gain corrector 66 and T
The signals from the k filter 41 are added and sent to the tracking actuator 17.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

Since the main component of the eccentricity is the rotation frequency of the optical disk, the drive signal from the Tk filter 41 also has the same frequency component, and the magnitude and direction of the drive signal are equal to the sine wave of the same frequency sent from the sine wave generator 64. The frequency is detected by the frequency detector 63 using this. FIG. 3 shows details of the frequency detector 63. FIG.
The middle waveform input indicates the Tk filter 41, the command input indicates the eccentricity correction command device 72, the gain output indicates the multiplier 67, and the phase output indicates the adder 68. The signal from the sine wave generator 64 is sent to the multiplier 81 and the phase delay unit 80.

The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends it to the multiplier 82. The signal from the Tk filter 41 is sent to the multipliers 81 and 82. The command signal from the eccentricity correction command unit 62 is
3 and to the integrator 84. The multiplier 81 multiplies the signal from the sine wave generator 64 by the signal from the Tk filter 41 and sends the result to the integrator 83. The multiplier 82 multiplies the signal from the phase delay unit 80 by the signal from the Tk filter 41, and sends the result to the integrator 84.

When the command signal from eccentricity correction command device 62 is at a high level, integrator 83 integrates the signal from multiplier 81 and sends the result to coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 84 integrates the signal from the multiplier 82 and sends the result to the coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a low level, the integrator 83 and the integrator 84 hold the integrated value and send it to the coordinate converter 85.

When the integrator 83 and the integrator 84 detect the rising edge of the command signal from the eccentricity correction command device 62, they clear the integrated value to zero. The coordinate converter 85 regards the integration values from the integrators 83 and 84 as a rectangular coordinate expression, converts the values into polar coordinates, sends the gain information to the multiplier 67, and sends the phase information to the adder 68. Frequency detector 69
Has the same configuration as the frequency detector 63.

In this embodiment, eccentricity correction learning is performed in two stages in order to perform eccentricity correction with high accuracy.

The eccentricity correction command unit 72 is used to perform the first-stage eccentricity correction learning.
3 is set to a high level only for one rotation of the optical disk. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

When the gain and phase of the signal from the sine wave generator 64 are used as a reference, the integrated value of the integrator 83, which is the calculation result using the signal from the sine wave generator 64, is The integral value of the integrator 84, which is a calculation result using a signal from the phase delay unit 80, indicates the real component of the magnitude of the optical disc rotation frequency component, and the integral value of the magnitude of the optical disc rotation frequency component in the signal from the Tk filter 41. Shows the imaginary component.

By converting the real and imaginary components of the magnitude of the rotational frequency component of the optical disk in the signal from the Tk filter 41 by the coordinate converter 85, the magnitude and phase of the rotational frequency component of the optical disk in the signal from the Tk filter 41 are obtained. Can be

The multiplier 67 multiplies the gain information from the frequency detector 63 by the initial value 1 from the frequency detector 69 to generate the first-stage eccentricity correction drive gain information. The adder 68 adds the phase information from the frequency detector 63 and the initial value 0 from the frequency detector 69 to generate phase information for the first-stage eccentricity correction drive. The signal from the sine wave generator 64 is phase-corrected by the phase corrector 65 in accordance with the obtained phase information of the first-stage eccentricity correction drive, and in accordance with the obtained gain information of the first-stage eccentricity correction drive. The gain is corrected by the gain corrector 66. In this way, a sine-wave shaped first-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained.

In the state where the obtained first-stage eccentricity correction drive is applied, the eccentricity correction instructor 72 performs a second-stage eccentricity correction learning so that a command signal to the frequency detector 69 which is normally at a low level is provided. Is set to a high level for the time of one rotation of the optical disk. Similarly to the frequency detector 63 at the first stage, the frequency detector 69 obtains gain information and phase information of the optical component rotation frequency component of the residual eccentricity in the drive signal from the Tk filter 41.

The multiplier 67 multiplies the gain information from the frequency detector 63 and the gain information from the frequency detector 69 to obtain gain information for the second-stage eccentricity correction drive. The adder 68 adds the phase information from the frequency detector 64 and the phase information from the frequency detector 69 to obtain the second stage eccentricity correction drive phase information.

The signal from the sine wave generator 64 is phase corrected by the phase corrector 65 in accordance with the obtained phase information of the second stage eccentricity correction drive, and the obtained gain of the second stage eccentricity correction drive is obtained. The gain is corrected by the gain corrector 66 according to the information. In this manner, a sine-wave shaped second-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained. Since the second-stage eccentricity correction drive corrects the residual in the first-stage eccentricity correction drive application state, it is more accurate than the first-stage eccentricity correction drive.

In the present embodiment, the number of times of eccentricity correction learning is set to two, but it is also possible to carry out a plurality of times.

(Embodiment 4) FIG. 6 is a block diagram of an optical disk device according to Embodiment 4. 6, the same components as those in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64 and the characteristic generator 70. The sine wave generator 64 sends a sine wave having the same frequency as the rotation frequency to the tracking actuator 17 via the phase corrector 65 and the gain corrector 66 based on the rotation phase information from the rotation phase output unit 51, and outputs the same signal. The signal is sent to the frequency detector 63 and the frequency detector 69. Eccentricity correction commander 72
Sends separate command signals to the frequency detector 63 and the frequency detector 69, respectively.

In the tracking non-control state, TE
The tracking error signal from the generator 40 is track 1
It has a one-cycle waveform for a book. The tracking error signal is binarized by the track cross generator 43 and sent to the track position detector 71. The track position detector 71 counts the rising edge of the track cross signal from the track cross generator 43, generates a track position by multiplying the track interval of the optical disc, and generates a track position.
3 and to the frequency detector 69.

When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 63 detects the track position from the track position detector 71 based on the frequency of the sine wave from the sine wave generator 64. The signal is detected to obtain the gain and the phase, and 0 is sent to the adder 68 and the multiplier 67 during the detection. When the command signal from the eccentricity correction command device 72 is at a low level, the frequency detector 63 uses the obtained gain information and phase information as a multiplier 67 and an adder 68, respectively.
Send to The initial values of the gain information and the phase information of the frequency detector 63 are 0.

When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 69 detects the track position from the track position detector 71 based on the frequency of the sine wave from the sine wave generator 64. The signal is detected to obtain the gain and the phase. During the detection, 0 is sent to the adder 68 and 1 is sent to the multiplier 67. The frequency detector 69 includes an eccentricity correction command device 72.
When the command signal is low, the obtained gain information and phase information are sent to the multiplier 67 and the adder 68, respectively. The initial value of the gain information of the frequency detector 69 is 1, and the initial value of the phase information is 0.

The characteristic generator 70 has gain information and phase information of the reverse transfer characteristic of the tracking actuator 17, detects the rotation frequency from the rotation position information from the rotation phase output device 51, and obtains a gain corresponding to the obtained frequency. The information and the phase information are sent to the multiplier 67 and the adder 68, respectively.
Since the reverse transfer characteristic of the tracking actuator 17 indicates what kind of drive signal is obtained for the tracking position signal, gain information and phase information for correcting the measured tracking position signal are obtained.

The multiplier 67 multiplies the gain information from the frequency detector 63, the frequency detector 69 and the characteristic generator 70 and sends the result to the gain corrector 66. The adder 68 adds the phase information from the frequency detector 63, the frequency detector 69, and the characteristic generator 70 and sends the result to the phase corrector 65. The phase corrector 65 changes the phase of the sine wave from the sine wave generator 64 based on the phase information from the adder 68. The gain corrector 66 changes the gain of the sine wave from the phase corrector 65 based on the gain information from the multiplier 67.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

In the tracking non-control state, TE
The tracking error signal from the generator 40 is track 1
It has a one-cycle waveform for a book. The rising edge of the signal binarized by the track cross generator 43 exists once for one track. The tracking position detector 71 counts rising edges of the signal from the track cross generator 43 and obtains a track position by multiplying the track interval of the disk.

Since the main component of the eccentricity is the rotation frequency of the optical disk, the track position signal from the track position detector 71 also has the same frequency component. The frequency is detected by the frequency detector 63 using the sine wave. FIG. 3 shows details of the frequency detector 63. The waveform input in FIG.
The command input indicates the eccentricity correction command device 62, the gain output indicates the multiplier 67, and the phase output indicates the adder 68.

The signal from the sine wave generator 64 is
And to the phase delay unit 80. The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends the delayed signal to the multiplier 82. The track position signal from the track position detector 71 is sent to multipliers 81 and 82. The command signal from the eccentricity correction command unit 62 is transmitted to the integrator 83 and the integrator 8
Sent to 4. The multiplier 81 multiplies the signal from the sine wave generator 64 by the track position signal from the track position detector 71, and sends the result to the integrator 83. The multiplier 82 multiplies the signal from the phase delay unit 80 by the track position signal from the track position detector 71, and sends the result to the integrator 84.

When the command signal from eccentricity correction command device 62 is at a high level, integrator 83 integrates the signal from multiplier 81 and sends the result to coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 84 integrates the signal from the multiplier 82 and sends the result to the coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a low level, the integrator 83 and the integrator 84 hold the integrated value and send it to the coordinate converter 85.

When the integrator 83 and the integrator 84 detect the rising edge of the command signal from the eccentricity correction command device 62, they clear the integrated value to zero. The coordinate converter 85 regards the integration values from the integrators 83 and 84 as a rectangular coordinate expression, converts the values into polar coordinates, sends the gain information to the multiplier 67, and sends the phase information to the adder 68. Frequency detector 69
Has the same configuration as the frequency detector 63.

In this embodiment, eccentricity correction learning is performed in two stages in order to perform eccentricity correction with high accuracy.

The eccentricity correction command unit 72 is used to perform the first-stage eccentricity correction learning.
3 is set to a high level only for one rotation of the optical disk. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

With reference to the gain and phase of the signal from the sine wave generator 64, the integrated value of the integrator 83, which is the calculation result using the signal from the sine wave generator 64, is obtained from the track position detector 71. The integrated value of the integrator 84, which is a calculation result using the signal from the phase delay unit 80, indicates the real component of the magnitude of the rotation frequency component of the optical disk in the track position signal. The imaginary component of the magnitude of the optical disk rotation frequency component is shown.

By converting the real component and the imaginary component of the magnitude of the optical disk rotation frequency component in the track position signal from the track position detector 71 by the coordinate converter 85, the rotation of the optical disk in the track position signal from the track position detector 71 is performed. The magnitude and phase of the frequency component are obtained.

The characteristic generator 70 generates gain information and phase information of the reverse transfer characteristic of the tracking actuator 17 at the rotation frequency of the optical disk.

The multiplier 67 multiplies the gain information from the frequency detector 63, the gain information from the characteristic generator 70, and the initial value 1 from the frequency detector 69 to generate gain information for the first-stage eccentricity correction drive. I do. The phase information from the frequency detector 63, the phase information from the characteristic generator 70, and the frequency detector 6
The adder 68 adds the initial value 0 from 9 to generate phase information of the first-stage eccentricity correction drive. The signal from the sine wave generator 64 is phase-corrected by the phase corrector 65 in accordance with the obtained phase information of the first-stage eccentricity correction drive, and in accordance with the obtained gain information of the first-stage eccentricity correction drive. The gain is corrected by the gain corrector 66. In this way, a sine-wave shaped first-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained.

In the state where the obtained first-stage eccentricity correction drive is applied, the eccentricity-correction command unit 72 performs a second-stage eccentricity correction learning so that a command signal to the frequency detector 69 which is normally at a low level is provided. Is set to a high level for the time of one rotation of the optical disk. On the basis of the gain and phase of the signal from the sine wave generator 64, the frequency detector 69 obtains gain information and phase information of the residual eccentric optical disk rotation frequency component in the track position signal from the track position detector 71.

The multiplier 67 multiplies the gain information from the frequency detector 63, the gain information from the characteristic generator 70, and the gain information from the frequency detector 69 to obtain gain information for the second-stage eccentricity correction drive. The phase information from the frequency detector 64, the phase information from the characteristic generator 70, and the frequency detector 69
Are added by the adder 68 to become the phase information of the second stage eccentricity correction drive.

The signal from the sine wave generator 64 is phase-corrected by the phase corrector 65 in accordance with the obtained phase information of the second-stage eccentricity correction drive, and the obtained gain of the second-stage eccentricity correction drive is obtained. The gain is corrected by the gain corrector 66 according to the information. In this manner, a sine-wave shaped second-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained. Since the second-stage eccentricity correction drive corrects the residual in the first-stage eccentricity correction drive application state, it is more accurate than the first-stage eccentricity correction drive.

In the present embodiment, the number of times of eccentricity correction learning is set to two, but it is also possible to carry out a plurality of times.

(Embodiment 5) FIG. 7 shows a block diagram of an optical disk apparatus according to Embodiment 5 of the present invention. 7, the same components as those in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64. The sine wave generator 64 sends a sine wave having the same frequency as the rotation frequency to the adder 42 via the phase corrector 65 and the gain corrector 66 based on the rotation phase information from the rotation phase output unit 51, and outputs the same signal. The signal is sent to the frequency detector 63 and the frequency detector 69. The eccentricity correction command device 72 sends separate command signals to the frequency detector 63 and the frequency detector 69, respectively.

Further, the eccentricity correction command unit 72 sends a signal to be sent to the frequency detector 69 to the vector calculator 73 at the same time.

When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 63 detects the Tk filter 4 based on the frequency of the sine wave from the sine wave generator 64.
The drive signal from 1 is detected to obtain the gain and the phase, and during that time, 0 is sent to the vector calculator 73 as the gain information and the phase information. The frequency detector 63 is provided with an eccentricity correction command device 72.
When the command signal is low level, the obtained gain information and phase information are sent to the vector calculator 73.

The initial values of the gain information and the phase information of the frequency detector 63 are 0. When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 69 detects the drive signal from the Tk filter 41 based on the frequency of the sine wave from the sine wave generator 64 to obtain a gain. , And 0 is sent to the vector calculator 73 as gain information and phase information. When the command signal from the eccentricity correction command device 72 is at a low level, the frequency detector 69 sends the obtained gain information and phase information to the vector calculator 73.

The initial values of the gain information and the phase information of the frequency detector 69 are zero. According to the command signal from the eccentricity correction command device 72, the vector calculator 73 converts the gain information and phase information calculated from the gain information and phase information from the frequency detector 63 and the gain information and phase information from the frequency detector 69, respectively. The signal is sent to the gain corrector 66 and the phase corrector 65. The phase corrector 65 is a vector calculator 7
3, the phase of the sine wave from the sine wave generator is changed.

The gain corrector 66 changes the gain of the sine wave from the phase corrector 65 based on the gain information from the vector calculator 73. The adder 42 is a gain corrector 6
6 and the signal from the Tk filter 41,
Send to tracking actuator 17.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

Since the main component of the eccentricity is the rotational frequency of the optical disk, the drive signal from the Tk filter 41 also has the same frequency component. The frequency is detected by the frequency detector 63 using this. FIG. 3 shows details of the frequency detector 63. FIG.
The middle waveform input indicates the Tk filter 41, the command input indicates the eccentricity correction command unit 72, and the gain output and the phase output indicate the vector calculator 73.

The signal from the sine wave generator 64 is
And to the phase delay unit 80. The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends the delayed signal to the multiplier 82. The signal from the Tk filter 41 is
And to the multiplier 82. The command signal from the eccentricity correction command device 62 is sent to the integrator 83 and the integrator 84. The multiplier 81 is connected to the signal from the sine wave generator 64 and the Tk filter 4.
The signal from 1 is multiplied and the result is sent to the integrator 83. The multiplier 82 receives the signal from the phase delay unit 80 and the Tk filter 41.
, And sends the result to an integrator 84.

When the command signal from eccentricity correction command device 62 is at a high level, integrator 83 integrates the signal from multiplier 81 and sends the result to coordinate converter 85. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 84 integrates the signal from the multiplier 82 and sends the result to the coordinate converter 85.

When the command signal from the eccentricity correction command device 62 is at a low level, the integrators 83 and 84 hold the integrated value and send it to the coordinate converter 85. When the integrator 83 and the integrator 84 detect the rising edge of the command signal from the eccentricity correction command device 62, they clear the integrated value to zero. The coordinate converter 85 regards the integration values from the integrators 83 and 84 as a rectangular coordinate expression, converts them into polar coordinates, and sends the gain information and the phase information to the vector calculator 73. The frequency detector 69 has the same configuration as the frequency detector 63.

FIG. 8 shows the details of the vector calculator 73.
The gain output in FIG. 8 indicates the gain corrector 66, and the phase output indicates the phase corrector 65. The frequency detector 63 sends the gain information to the vector subtractor 90 and the gain calculator 91. The frequency detector 63 converts the phase information into a vector subtractor 90.
And to the phase calculator 92. The frequency detector 69 sends the gain information and the phase information to the vector subtractor 90. The eccentricity correction command device 72 sends a command signal to the vector subtractor 90.

The vector subtractor 90 has an eccentricity correction commander 72.
Until the falling edge of the command signal from
The gain information and the phase information from the frequency detector 63 are sent to the gain calculator 91 and the phase calculator 92, respectively. After detecting the falling edge of the command signal from the eccentricity correction command device 72, the vector subtractor 90
From the vector consisting of the gain and phase information from
The vector consisting of the gain information and the phase information from the frequency detector 69 is subtracted, and the gain information and the phase information of the result vector are respectively subtracted from the gain calculator 91 and the phase calculator 9.
Send to 2.

The gain calculator 91 divides the square of the gain information from the frequency detector 63 by the gain information from the vector calculator 90 and sends the result to the gain corrector 66. Phase calculator 92
Subtracts the phase information from the vector subtractor 90 from twice the phase information from the frequency detector 63 and sends it to the phase corrector 65. Since the frequency detector 63 and the vector calculator 90 output the same gain information and phase information until the falling edge from the eccentricity correction commander 72 is detected, the gain information and the phase calculator 92 from the gain calculator 91 are output. Are the same as the gain information and the phase information from the frequency detector 63, respectively.

In the present embodiment, eccentricity correction learning is performed in two stages in order to perform accurate eccentricity correction.

The eccentricity correction command unit 72 is used to perform the first-stage eccentricity correction learning.
3 and the command signal to the vector calculator 73 are set to the high level for the time of one rotation of the optical disk. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

When the gain and phase of the signal from the sine wave generator 64 are used as a reference, the integrated value of the integrator 83, which is the calculation result using the signal from the sine wave generator 64, is The integral value of the integrator 84, which is a calculation result using the signal from the phase delay unit 80, indicates the real component of the magnitude of the optical disc rotation frequency component. Shows the imaginary component. By converting the real component and the imaginary component of the magnitude of the optical disk rotational frequency component in the signal from the Tk filter 41 by the coordinate converter 85, the magnitude and phase of the optical disk rotational frequency component in the signal from the Tk filter 41 are obtained.

Since the gain information and the phase information from the frequency detector 69 are 0, the gain information and the phase information from the vector calculator 73 are the same as the gain information and the phase information from the frequency detector 63, respectively.

The gain information from the vector calculator 73 is used as it is as the gain information for the first-stage eccentricity correction drive. The phase information from the vector calculator 73 becomes the phase information of the first-stage eccentricity correction drive as it is.

The signal from the sine wave generator 64 is phase-corrected by the phase corrector 65 in accordance with the obtained phase information of the first-step eccentricity correction drive, and the obtained gain of the first-step eccentricity correction drive is obtained. The gain is corrected by the gain corrector 66 according to the information. In this way, a sine-wave shaped first-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained.

In the state where the obtained first-stage eccentricity correction drive is applied, the eccentricity correction command device 72 performs the second-stage eccentricity correction learning, so that the command signal to the frequency detector 69 which is normally low level is provided. Is set to a high level for the time of one rotation of the optical disk. Based on the gain and phase of the signal from the sine wave generator 64, the frequency detector 69 determines the magnitude and phase of the optical disk rotation frequency component in the drive signal from the Tk filter 41. In the stage where the magnitude and phase of the residual eccentricity in the state where the first-stage eccentricity correction drive is applied are determined, the eccentricity correction commander 72 and the vector calculator 73
Since the command signal falls, the vector calculator 73 performs correction by vector calculation thereafter.

The gain information and the phase information measured by the frequency detector 69 in the second-stage eccentricity correction learning are as follows:
It shows the residual eccentricity in a state where the first-stage eccentricity correction drive is applied. Therefore, if the eccentricity is completely corrected by the first-stage eccentricity correction learning, the gain information of the second-stage eccentricity correction learning becomes zero. The gain information and the phase information as the result of the vector subtractor 90 indicate a change in the eccentricity due to the first-stage eccentricity correction driving.

Since the target to be corrected is the gain information and the phase information from the frequency detector 63 obtained in the first stage, the correction amounts of the gain information and the phase information are adjusted so that the result of the vector subtractor 90 matches them. The calculation is performed by the calculator 91 and the phase calculator 92, respectively.

The gain calculator 91 calculates the vector subtractor 9 for the gain information from the frequency detector 63.
The gain error of the gain information from 0 can be corrected. The frequency detector 63 is calculated by the phase calculator 92.
The phase error of the phase information from the vector subtractor 90 with respect to the phase information from The second-stage eccentricity correction drive is generated by using the corrected gain information and phase information from the vector calculator 73.

The signal from the sine wave generator 64 is phase corrected by the phase corrector 65 in accordance with the obtained phase information of the second stage eccentricity correction drive, and the obtained gain of the second stage eccentricity correction drive is obtained. The gain is corrected by the gain corrector 66 according to the information. In this way, the variation caused by the second-stage eccentricity correction drive can be made closer to the variation indicated by the gain information and the phase information from the frequency detector 63.

(Embodiment 6) FIG. 9 is a block diagram of an optical disk apparatus according to Embodiment 6. In FIG. 9, the same components as those in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is sent to the sine wave generator 64 and the characteristic generator 70. The sine wave generator 64 sends a sine wave having the same frequency as the rotation frequency to the tracking actuator 17 via the phase corrector 65 and the gain corrector 66 based on the rotation phase information from the rotation phase output unit 51, and outputs the same signal. The signal is sent to the frequency detector 63 and the frequency detector 69. Eccentricity correction commander 72
Sends separate command signals to the frequency detector 63 and the frequency detector 69, respectively.

Further, the eccentricity correction command unit 72 sends a signal to be sent to the frequency detector 69 to the vector calculator 73 at the same time.

In the tracking non-control state, TE
The tracking error signal from the generator 40 is track 1
It has a one-cycle waveform for a book. The tracking error signal is binarized by the track cross generator 43 and sent to the track position detector 71. The track position detector 71 counts rising edges of the track cross signal from the track cross generator 43, generates a track position by multiplying the track interval of the optical disk, and generates a track position.
3 and to the frequency detector 69.

When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 63 detects the track position from the track position detector 71 based on the frequency of the sine wave from the sine wave generator 64. The signal is detected to obtain the gain and the phase, and during that time, 0 is sent to the vector calculator 73 as the gain information and the phase information. When the command signal from the eccentricity correction command device 72 is at a low level, the frequency detector 63 sends the obtained gain information and phase information to the vector calculator 73.

The initial values of the gain information and the phase information of the frequency detector 63 are 0. When the command signal from the eccentricity correction command device 72 is at a high level, the frequency detector 69 detects the track position signal from the track position detector 71 based on the frequency of the sine wave from the sine wave generator 64. To obtain the gain and phase, and during that time, the vector calculator 7
0 is sent to 3 as gain information and phase information. When the command signal from the eccentricity correction command device 72 is at a low level, the frequency detector 69 sends the obtained gain information and phase information to the vector calculator 73.

The initial values of the gain information and the phase information of the frequency detector 69 are zero. According to the command signal from the eccentricity correction command device 72, the vector calculator 73 converts the gain information and phase information calculated from the gain information and phase information from the frequency detector 63 and the gain information and phase information from the frequency detector 69, respectively. Multiplier 67 and adder 68
Send to

The characteristic generator 70 has gain information and phase information of the reverse transfer characteristic of the tracking actuator 17, detects the rotational frequency from the rotational position information from the rotational phase output unit 51, and obtains a gain corresponding to the obtained frequency. The information and the phase information are sent to the multiplier 67 and the adder 68, respectively.
Since the reverse transfer characteristic of the tracking actuator 17 indicates what kind of drive signal is obtained for the tracking position signal, gain information and phase information for correcting the measured tracking position signal are obtained.

The multiplier 67 multiplies the gain information from the vector calculator 73 and the gain information from the characteristic generator 70, and
Send to 6. The adder 68 adds the phase information from the vector calculator 73 and the characteristic generator 70 and sends the result to the phase corrector 65. The phase corrector 65 changes the phase of the sine wave from the sine wave generator based on the phase information from the adder 68.
The gain corrector 66 changes the gain of the sine wave from the phase corrector 65 based on the gain information from the multiplier 67.

The operation of the sine wave generator 64 will be described with reference to FIG. FIG. 2A shows a signal from the rotary phase output unit 51, and FIG. 2B shows a signal from the sine wave generator 64. The sine wave generator 64 has the same cycle as the cycle of the signal from the rotary phase output unit 51, and generates and outputs a sine wave having a predetermined gain and phase. The generated sine wave waveform has the same frequency as the optical disk rotation frequency, and serves as a base for generating an eccentricity correction drive signal.

In the tracking non-control state, TE
The tracking error signal from the generator 40 is track 1
It has a one-cycle waveform for a book. The rising edge of the signal binarized by the track cross generator 43 exists once for one track. The tracking position detector 71 counts rising edges of the signal from the track cross generator 43 and obtains a track position by multiplying the track interval of the disk.

Since the main component of the eccentricity is the rotation frequency of the optical disk, the track position signal from the track position detector 71 also has the same frequency component, and the magnitude and direction of the same frequency component are transmitted from the sine wave generator 64. The frequency is detected by the frequency detector 63 using the sine wave. FIG. 3 shows details of the frequency detector 63. The waveform input in FIG.
The command input indicates the eccentricity correction command device 72, and the gain output and the phase output indicate the vector calculator 73. The signal from the sine wave generator 64 is supplied to a multiplier 81 and a phase delay unit 80.
Sent to The phase delay unit 80 delays the phase of the signal from the sine wave generator 64 by π / 2 and sends the delayed signal to the multiplier 82.

The track position signal from the track position detector 71 is sent to multipliers 81 and 82. The command signal from the eccentricity correction command unit 62 is transmitted to the integrator 83 and the integrator 8
Sent to 4. The multiplier 81 multiplies the signal from the sine wave generator 64 by the track position signal from the track position detector 71, and sends the result to the integrator 83. The multiplier 82 multiplies the signal from the phase delay unit 80 by the track position signal from the track position detector 71, and sends the result to the integrator 84. When the command signal from the eccentricity correction command device 62 is at a high level, the integrator 83 integrates the signal from the multiplier 81 and sends the result to the coordinate converter 85.

When the command signal from eccentricity correction command device 62 is at a high level, integrator 84 integrates the signal from multiplier 82 and sends the result to coordinate converter 85. When the command signal from the eccentricity correction command unit 62 is at a low level, the integrator 83 and the integrator 84 hold the integrated value and store the coordinate
Send to When the integrator 83 and the integrator 84 detect the rising edge of the command signal from the eccentricity correction command device 62, they clear the integrated value to zero. The coordinate converter 85 regards the integration values from the integrators 83 and 84 as a rectangular coordinate expression, converts them into polar coordinates, and sends the gain information and the phase information to the vector calculator 73. The frequency detector 69 has the same configuration as the frequency detector 63.

FIG. 8 shows the details of the vector calculator 73.
The gain output in FIG. 8 indicates a multiplier 67, and the phase output indicates an adder 68. The frequency detector 63 sends the gain information to the vector subtractor 90 and the gain calculator 91. The frequency detector 63 sends the phase information to the vector subtractor 90 and the phase calculator 92. The frequency detector 69 sends the gain information and the phase information to the vector subtractor 90. Eccentricity correction commander 72
Sends a command signal to the vector subtractor 90.

The vector subtractor 90 has an eccentricity correction commander 72
Until the falling edge of the command signal from
The gain information and the phase information from the frequency detector 63 are sent to the gain calculator 91 and the phase calculator 92, respectively. After detecting the falling edge of the command signal from the eccentricity correction command device 72, the vector subtractor 90
From the vector consisting of the gain and phase information from
The vector consisting of the gain information and the phase information from the frequency detector 69 is subtracted, and the gain information and the phase information of the result vector are respectively subtracted from the gain calculator 91 and the phase calculator 9.
Send to 2.

The gain calculator 91 divides the square of the gain information from the frequency detector 63 by the gain information from the vector calculator 90 and sends the result to the multiplier 67. The phase calculator 92 subtracts the phase information from the vector subtractor 90 from twice the phase information from the frequency detector 63 and sends the result to the adder 68. Since the frequency detector 63 and the vector calculator 90 output the same gain information and phase information until the falling edge from the eccentricity correction commander 72 is detected, the gain information and the phase calculator 92 from the gain calculator 91 are output. Are the same as the gain information and the phase information from the frequency detector 63, respectively.

In the present embodiment, eccentricity correction learning is performed in two stages in order to perform accurate eccentricity correction.

The eccentricity correction command device 72 is used to perform the first-stage eccentricity correction learning.
3 and the command signal to the vector calculator 73 are set to the high level for the time of one rotation of the optical disk. The integrator 83 and the integrator 84 clear the integral value to 0 at the start of the eccentricity correction learning, and integrate the multiplication result for one rotation of the optical disk, that is, one cycle of the eccentricity. A method of multiplying and integrating a target waveform by using two sine waves having a predetermined frequency and a phase difference of π / 2 from each other is called orthogonal heterodyne detection. As a result, a real component and an imaginary component of the gain at a predetermined frequency component of the target waveform are obtained.

When the gain and phase of the signal from the sine wave generator 64 are used as a reference, the integrated value of the integrator 83, which is the calculation result using the signal from the sine wave generator 64, is obtained from the track position detector 71. The integrated value of the integrator 84, which is a calculation result using the signal from the phase delay unit 80, indicates the real component of the magnitude of the rotation frequency component of the optical disk in the track position signal. The imaginary component of the magnitude of the optical disk rotation frequency component is shown. By converting a real component and an imaginary component of the magnitude of the optical disk rotation frequency component in the track position signal from the track position detector 71 by the coordinate converter 85, the optical disk rotation frequency component in the track position signal from the track position detector 71 is converted. The magnitude and phase are obtained.

Since the gain information and the phase information from the frequency detector 69 are 0, the gain information and the phase information from the vector calculator 73 are the same as the gain information and the phase information from the frequency detector 63, respectively.

The characteristic generator 70 generates gain information and phase information of the reverse transfer characteristic of the tracking actuator 17 at the rotation frequency of the optical disk.

The gain information from the vector calculator 73 is multiplied by the multiplier 67 with the gain information from the characteristic generator 70 to become the first stage eccentricity correction drive gain information. The phase information from the vector calculator 73 is added to the phase information from the characteristic generator 70 by the adder 68 to become the first-stage eccentricity correction drive phase information. The signal from the sine wave generator 64 is phase-corrected by the phase corrector 65 in accordance with the obtained phase information of the first-stage eccentricity correction drive, and in accordance with the obtained gain information of the first-stage eccentricity correction drive. The gain is corrected by the gain corrector 66. In this way, a sine-wave shaped first-stage eccentricity correction drive corresponding to the magnitude and phase of the eccentricity is obtained.

In the state where the obtained first-stage eccentricity correction drive is applied, the eccentricity correction command unit 72 performs a second-stage eccentricity correction learning, so that the command signal to the frequency detector 69 which is normally low level is provided. Is set to a high level for the time of one rotation of the optical disk. On the basis of the gain and phase of the signal from the sine wave generator 64, the frequency detector 69 determines the magnitude and phase of the optical disk rotation frequency component in the track position signal from the track position detector 71.

At the stage where the magnitude and phase of the residual eccentricity are obtained in the state where the first-stage eccentricity correction drive is applied, the command signal from the eccentricity correction command device 72 to the vector calculator 73 falls. After that, the vector calculator 73 performs correction by vector calculation.

The gain information and phase information measured by the frequency detector 69 in the second-stage eccentricity correction learning are as follows:
It shows the residual eccentricity in a state where the first-stage eccentricity correction drive is applied. Therefore, if the eccentricity is completely corrected by the first-stage eccentricity correction learning, the gain information of the second-stage eccentricity correction learning becomes zero. The gain information and the phase information as the result of the vector subtractor 90 indicate a change in the eccentricity due to the first-stage eccentricity correction driving. Since the target to be corrected is the gain information and the phase information from the frequency detector 63 obtained in the first stage, the amounts of correction of the gain information and the phase information are calculated so that the result of the vector subtractor 90 matches them. And a phase calculator 92 respectively.

The vector subtractor 9 for the gain information from the frequency detector 63 is calculated by the gain calculator 91.
The gain error of the gain information from 0 can be corrected. The frequency detector 63 is calculated by the phase calculator 92.
The phase error of the phase information from the vector subtractor 90 with respect to the phase information from The second-stage eccentricity correction drive is generated by using the corrected gain information and phase information from the vector calculator 73.

The signal from the sine wave generator 64 is phase corrected by the phase corrector 65 in accordance with the obtained phase information of the second stage eccentricity correction drive, and the obtained gain of the second stage eccentricity correction drive is obtained. The gain is corrected by the gain corrector 66 according to the information. In this way, the variation caused by the second-stage eccentricity correction drive can be made closer to the variation indicated by the gain information and the phase information from the frequency detector 63.

(Embodiment 7) FIG. 10 is a block diagram of an optical disk apparatus according to Embodiment 7. 10, the same elements as those of FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The signal from the photodetector 20 is sent to the address detector 100. The address detector 100 detects the current address scanned by the light beam and sends the address to the address comparator 102. The reference address holder 101 stores all addresses from the inner circumference to the outer circumference in the reference rotation phase, and stores the address information in the address comparator 1.
Send to 02. The address comparator 102 is an address detector 1
00 is stored in the reference address holder 101.
A pulse signal having a predetermined width is sent to the rotation phase output unit 51 when the address matches any one of the addresses. Rotary phase output device 5
1 detects the rising edge of the signal from the address comparator 102 and changes the reference of the rotation phase information sent to the eccentricity memory 60 to the rotation phase at that time.

In a state where the optical disk 1 is reproduced, the address detector 100 can always obtain the current address information. There are 10 addresses in one rotation, 10n +
A position of 1 (n is a natural number) is set as a target based on the rotation phase.
The reference address holder 101 is 10n + 1 (n is a natural number)
Holds the address information. FIG. 11A shows the address arrangement on the optical disk 1. The light beam scans rightward in address order. When an address that satisfies 10n + 1 (n is a natural number) is reached in each round, the address comparator 1
From 02, a pulse signal as shown in FIG. 11b is generated.
The rotation phase output unit 51 changes the reference of the rotation phase information in accordance with the pulse signal generated once per rotation from the address comparator 102, so that the same rotation phase position is always used as the reference. Even if the state of the eccentricity correction operation is changed to the sleep state and the reference of the rotational phase information output from the rotational phase output device 51 is shifted, such correction is performed at the time of restarting. The displacement can be suppressed.

(Eighth Embodiment) FIG. 12 is a block diagram of an optical disk apparatus according to the eighth embodiment. 12, the same components as those of FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The signal from the TE generator 40 is sent to the LG polarity detector 103. The LG polarity detector 103 detects an address arrangement pattern every time an address appears, and sends it to the LG polarity holder 104 and the LG polarity comparator 105. LG
The polarity holder 104 holds the address arrangement pattern from the LG polarity detector 103 and sends the address arrangement pattern at the previous address to the LG polarity comparator 105.

The LG polarity comparator 105 is the LG polarity detector 1
03 and the LG polarity holder 1
A pulse signal having a predetermined width is sent to the rotation phase output unit 51 when the address arrangement patterns from the address 04 are different from each other. When detecting the rising edge of the signal from the address comparator 102, the rotation phase output unit 51 changes the reference of the rotation phase information sent to the eccentric memory 60 to the rotation phase at that time.

The tracks of the optical disk 1 are formed by guide grooves, and the guide grooves have concave portions (hereinafter, referred to as Land portions) and convex portions (hereinafter, referred to as Groove portions). 1
For each rotation, a Land section and a Groove section exist along the track, and their switching points are on the same rotation phase. L
In the and portion, the address information exists in a dribbled shape in which the first half of the address is shifted to the outer peripheral side and the second half of the address is shifted to the inner peripheral side with respect to the track. In the groove portion, the address information exists in a dribbled shape in which the first half of the address is shifted inward toward the track and the second half of the address is shifted outward in relation to the track. This shift pattern is an address arrangement pattern.

If an address arrangement pattern is detected, La
It is possible to determine whether it is an nd part or a groove part, and it is possible to detect a switching point from the land part to the groove part and a switching point from the groove part to the land part. FIG. 13A shows whether the position scanned by the light beam is the Land portion or the Groove portion. FIG.
2 shows a tracking error signal from the TE generator 40. In the Land portion, since the address is shifted in the track direction in the order of the outer circumference and the inner circumference, the tracking error signal is generated as a disturbance in the vertical direction as shown in the left part of FIG. 13B. In the Groove section, since the address is shifted in the track direction in the order of the inner circumference and the outer circumference, the tracking error signal is generated as a disorder in the order of the upper part as shown in the right part of FIG. 13B.

The LG polarity detector 103 detects an address arrangement pattern from the pattern of the disturbance of the tracking error signal. In FIG. 13, from the Land section to Groo
When switching to the ve section, the address arrangement pattern that can be detected from the tracking error signal also changes. Since the current address arrangement pattern is different from the address arrangement pattern at the immediately preceding address, the LG polarity comparator 105 sends a pulse signal as shown in FIG. The rotation phase output device 51 generates La once per rotation.
LG polarity comparator 105 generated at the switching point from the nd part to the groove part or from the groove part to the land part
The reference of the rotational phase information is changed in accordance with the pulse signal from, so that the same rotational phase position is always the reference.

Even if the eccentricity correction operation is switched from the operation state to the sleep state, and the reference of the rotational phase information output from the rotational phase output unit 51 is shifted, such correction is made at the time of restarting. The phase shift of the operation can be suppressed.

(Embodiment 9) FIG. 14 is a block diagram of an optical disk apparatus according to Embodiment 9 of the present invention. 14, the same elements as those of FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The rotation phase information from the rotation phase output unit 51 is supplied to a differential maximum detector 106 and a rotation reference designator 107.
Sent to The differential maximum detector 106 is a rotary phase output unit 5
The rotation phase position at which the derivative of the rotation phase information from 1 is maximized is detected and sent to the rotation reference designator 107.

The rotation reference designator 107 is a rotation phase output unit 5
When the rotation phase information from 1 and the rotation phase position from the maximum differential detector 106 match, a pulse of a predetermined width is sent to the rotation phase output unit 51. The rotation phase output unit 51 is an address comparator 1
When the rising edge of the signal from the signal 02 is detected, the reference of the rotation phase information sent to the eccentricity memory 60 is changed to the rotation phase at that time.

FIG. 15A shows the rotation phase information from the rotation phase output unit 51, and FIG. 15B shows the signal from the rotation reference designator 107. The rotation phase output device 51 counts the rising edge of the encoder pulse from the motor 50. Even when the motor 50 is rotating at a constant rotation speed, the increase in the rotation phase information is not constant as shown in FIG.

The differential maximum detector 106 is a rotary phase output unit 5
By calculating the derivative of the rotation phase information from 1, the increase slope of the rotation phase information is measured. In addition, the differential maximum detector 10
Numeral 6 detects the maximum value between when the rotation phase information from the rotation phase output device 51 is cleared and when the rotation phase information is next cleared. The differential maximum detector 106 sends the rotation phase information of the point where the differentiation is maximum, that is, the point indicated by t0 in FIG.

The rotation reference designator 107 is a differential maximum detector 1
When the rotation phase information from the rotation phase information 06 and the rotation phase information from the rotation phase output unit 51 match, the count value of the rotation phase information is cleared as shown by a point t1 in FIG. Generate information. After t1, the reference of the rotation phase information and the rotation phase at which the differentiation of the rotation phase information is maximized match, so that the reference of the rotation phase information does not change.

The rotation phase information from the rotation phase output unit 51 is always based on the point where the differentiation of the same rotation phase information is maximized. Even if the state of the eccentricity correction operation is changed to the sleep state and the reference of the rotational phase information output from the rotational phase output device 51 is shifted, such correction is performed at the time of restarting. The displacement can be suppressed.

[0158]

As described above, according to the present invention, the direction and magnitude of the eccentricity can be accurately detected in a short time even if the tracking drive has a waveform including many components other than the optical disk rotation frequency. And accurate correction can be performed.

Further, the eccentricity correction residual can be detected without adding a sensor, and more accurate correction can be performed.

Further, even when the sleep state is set and the reference of the rotational phase information changes, the reference can be corrected and accurate eccentricity correction can be performed.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a relationship between rotational phase information from a rotational phase output device (FIG. A) and a sine wave signal from a sine wave generator (FIG. B) according to Embodiment 1 of the present invention;

FIG. 3 is a detailed block diagram of a frequency detector according to Embodiment 1 of the present invention.

FIG. 4 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a third embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration according to a fifth embodiment of the present invention.

FIG. 8 is a detailed block diagram of a vector calculator according to the fifth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration according to a seventh embodiment of the present invention.

FIG. 11 is a diagram illustrating a relationship between address information from an address detector (FIG. A) and a pulse signal from an address comparator (FIG. B) according to a seventh embodiment of the present invention;

FIG. 12 is a block diagram showing a configuration of an eighth embodiment of the present invention.

FIG. 13 shows a guide groove polarity (FIG. A), a tracking error signal from a TE generator (FIG. B), and a pulse signal from an LG polarity comparator (FIG. C) according to the eighth embodiment of the present invention. Relationship diagram

FIG. 14 is a block diagram showing a configuration of a ninth embodiment of the present invention.

FIG. 15 is a diagram illustrating a relationship between rotational phase information from a rotational phase output device (FIG. A) and a pulse signal from a rotational reference designator (FIG. B) according to a ninth embodiment of the present invention;

FIG. 16 is a block diagram showing a configuration of a conventional device.

FIG. 17 shows rotational phase information (FIG. A) from a rotational phase output device, a command signal from an eccentricity correction command device (FIG. B), and an eccentricity correction drive signal from a search manager from a low-pass filter in a conventional example. c) Relationship diagram

FIG. 18 is a diagram illustrating a relationship between a tracking drive signal and generated eccentricity correction drive in the conventional example (FIG. A) and the first embodiment (FIG. B) of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 10 Optical head 11 Laser 12 Coupling lens 13 Polarization beam splitter 14 1/4 wavelength plate 15 Condensing lens 16 Focus actuator 17 Tracking actuator 18 Detection lens 19 Cylindrical lens 20 Photodetector 30 FE generator 31 Fc filter 40 TE Generator 41 Tk filter 42 Adder 43 Track cross generator 50 Motor 51 Rotational phase output device 60 Eccentric memory 61 Low pass filter 62 Eccentricity correction commander 63 Frequency detector 64 Sine wave generator 65 Phase corrector 66 Gain corrector 67 Multiplier 68 Adder 69 Frequency detector 70 Characteristic generator 71 Track position detector 72 Decentering correction commander 73 Vector calculator 80 Phase delay 81 Multiplier 82 Multiplier 83 Integrator 84 Integrator 85 Coordinate Converter 90 Vector subtractor 91 Gain calculator 92 Phase calculator 100 Address detector 101 Reference address holder 102 Address comparator 103 LG polarity detector 104 LG polarity holder 105 LG polarity comparator 106 Differential maximum detector 107 Rotation reference Designator

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takeharu Yamamoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5D118 AA19 BA01 CA09 CA13 CB02 CD03 CD12

Claims (14)

[Claims] 1. A converging means for converging and irradiating a light beam onto a rotating disk-shaped information carrier, a moving means for moving said converging means to irradiate a desired track with a light beam, A tracking error detecting means for detecting a displacement between the light beam and the track; and a light beam irradiated on the information carrier by driving the moving means based on a tracking error signal from the tracking error detecting means. Tracking control means for outputting a drive signal for controlling to follow the upper track, rotation frequency measurement means for measuring the rotation frequency of the information carrier, and a sine wave for generating a sine wave having the measured rotation frequency Generating means for controlling eccentricity of the information carrier based on a drive signal from the tracking control means and the measured rotation frequency. A first eccentricity measuring means for measuring a gain and a phase of a corresponding sine wave; and a gain and a phase of the sine wave generated from the sine wave generating means, Waveform shaping means for shaping into a phase, a sine wave shaped by the waveform shaping means, and a drive signal from the tracking control means, and driving the moving means based on the added signal. An eccentricity correction unit, and an eccentricity correction instruction unit that outputs an eccentricity correction instruction while performing control by the tracking control unit. When input to the first eccentricity measuring means, the first eccentricity measuring means measures the gain and phase of a sine wave corresponding to the eccentricity of the information carrier, and the waveform shaping means calculates the measured gain. And the phase, and then The based on the gain and phase, an optical disk device for sine wave gain and a phase waveform shaped output generated from the sine wave generating means. 2. A converging means for converging and irradiating a light beam onto a rotating disc-shaped information carrier; a moving means for moving said converging means for irradiating a desired track with a light beam; A tracking error detecting means for detecting a displacement between the light beam and the track; and a light beam irradiated on the information carrier by driving the moving means based on a tracking error signal from the tracking error detecting means. Tracking control means for outputting a drive signal for controlling to follow the upper track, rotation frequency measurement means for measuring the rotation frequency of the information carrier, and a sine wave for generating a sine wave having the measured rotation frequency Means for generating the information based on a tracking error signal from the tracking error and the measured rotation frequency. The first eccentricity measuring means for measuring the gain and phase of the sine wave corresponding to the eccentricity of the body, and the gain and phase of the sine wave generated from the sine wave generating means, the first eccentricity measuring means The obtained waveform shaping means for shaping to gain and phase, a sine wave shaped by the waveform shaping means, and a drive signal from the tracking control means are added, and based on the added signal, An eccentricity correction unit that drives a moving unit, and an eccentricity correction instruction unit that outputs an eccentricity correction instruction while control is not being performed by the tracking control unit.From the eccentricity correction instruction unit, When the eccentricity correction command is input to the first eccentricity measuring means, the first eccentricity measuring means measures the gain and phase of a sine wave corresponding to the eccentricity of the information carrier, and the waveform shaping means And the measured gain and phase憶 and, thereafter, based on the stored gain and phase, an optical disk device for the sine wave gain and phase and waveform shaping the output generated from the sine wave generating means. 3. An eccentricity measuring means for measuring a gain and a phase of a sine wave corresponding to the eccentricity of the information carrier based on a drive signal from the tracking control means and a measured rotation frequency, After measuring the gain and phase in the first eccentricity measuring means,
When the eccentricity correction command is input from the eccentricity correction commanding means to the second eccentricity measuring means, the second eccentricity measuring means measures the gain and phase of a sine wave corresponding to the eccentricity of the information carrier. The waveform shaping means stores the gain and the phase measured by the first eccentricity measuring means and the second eccentricity measuring means, and thereafter, based on the stored gain and phase, the sine wave generating means 2. The optical disc apparatus according to claim 1, wherein the gain and the phase of the sine wave generated from the waveform are shaped and output. 4. An eccentricity measuring means for measuring a gain and a phase of a sine wave corresponding to the eccentricity of the information carrier based on the tracking error signal from the tracking error detecting means and the measured rotation frequency, After measuring the gain and phase in the first eccentricity measuring means,
When the eccentricity correction command is input from the eccentricity correction commanding means to the second eccentricity measuring means, the second eccentricity measuring means measures the gain and phase of a sine wave corresponding to the eccentricity of the information carrier. The waveform shaping means stores the gain and the phase measured by the first eccentricity measuring means and the second eccentricity measuring means, and thereafter, based on the stored gain and the phase, from the sine wave generating means. 3. The optical disk device according to claim 2, wherein the gain and the phase of the generated sine wave are shaped and output. 5. The eccentricity correcting means provides a predetermined phase advance in the direction of eccentricity from the first eccentricity measuring means according to the number of revolutions from the number of revolutions measuring means. 2. The optical disc device according to 2. 6. The eccentricity correcting means multiplies the magnitude of eccentricity from the first eccentricity measuring means by a predetermined gain according to the number of rotations from the number of rotations measuring means. 2. The optical disc device according to 2. 7. A converging means for converging and irradiating a light beam toward a rotating disk-shaped information carrier; a moving means for moving said converging means to irradiate a desired beam with a light beam; A tracking error detecting means for detecting a displacement between the light beam and the track, and a light beam irradiated on the information carrier by driving the moving means based on a tracking error signal from the tracking error detecting means. Tracking control means for outputting a drive signal for controlling to follow the upper track; rotational phase measuring means for measuring the rotational phase of the information carrier; and positional deviation between the light beam and the track on the information carrier. The driving signal to the moving means for reducing the noise and the driving signal from the tracking control means are added, and based on the added signal, And an eccentricity correcting means for driving the moving means, and an address detecting means for detecting an address of the information carrier irradiated with the light beam, wherein a phase reference of the rotational phase measuring means is detected from the address detecting means. An optical disk device characterized by being determined by address information. 8. An address arrangement storage unit having an address arrangement of the information carrier, wherein a phase reference of the rotational phase measurement unit is determined based on address information from the address detection unit and an address arrangement from the address arrangement storage unit. The optical disk device according to claim 7, wherein: 9. A converging means for converging and irradiating a light beam toward a rotating disk-shaped information carrier, and a converging means for irradiating a light beam to a desired track. Moving means for moving the convergence means; tracking error detecting means for detecting a displacement between a light beam and a track on the information carrier; and moving the moving means based on a tracking error signal from the tracking error detecting means. A tracking control unit that outputs a drive signal for controlling a light beam driven and irradiated on the information carrier to follow a track on the information carrier; and a rotation phase measurement unit that measures a rotation phase of the information carrier. A drive signal to the moving means for reducing the displacement between the light beam on the information carrier and the track; and a drive signal from the tracking control means. Adding the signals, based on the added signal, the an eccentricity correcting means for driving the moving means, protrusions from the recess of the track groove on the information carrier or,
An optical disc device, comprising: switching point detecting means for detecting a switching point from a convex portion to a concave portion, wherein a phase reference of the rotational phase measuring means is determined by switching point information from the switching point detecting means. 10. An address detecting means for detecting an address of said information carrier irradiated with a light beam, wherein said switching point detecting means detects switching point information based on address information from said address detecting means. 10. The optical disk device according to claim 9, wherein: 11. The optical disk device according to claim 9, wherein the switching point detecting means detects switching point information based on a tracking error signal from the tracking error detecting means. 12. A converging means for converging and irradiating a light beam toward a rotating disc-shaped information carrier; a moving means for moving said converging means to irradiate a desired track with a light beam; A tracking error detecting means for detecting a displacement between the light beam and the track, and a light beam irradiated on the information carrier by driving the moving means based on a tracking error signal from the tracking error detecting means. Tracking control means for outputting a drive signal for controlling to follow the upper track; rotational phase measuring means for measuring the rotational phase of the information carrier; and positional deviation between the light beam and the track on the information carrier. The driving signal to the moving means and the driving signal from the tracking control means are reduced. Eccentricity correction means for driving the moving means, and turbulence detection means for measuring turbulence during one rotation of the rotation phase information from the rotation phase measurement means, the phase reference of the rotation phase measurement means An optical disk device, wherein the optical disk device is determined based on disturbance information from the disturbance detecting means. 13. The method according to claim 1, wherein said disturbance detecting means detects a maximum value of a differential during one rotation of the rotational phase information from said rotational phase measuring means, and determines a phase reference of said rotational phase measuring means. Item 13. The optical disk device according to item 12. 14. The apparatus according to claim 1, wherein said disturbance detecting means detects a minimum value of a differential of the rotation phase information from said rotation phase measurement means during one rotation, and determines a phase reference of said rotation phase measurement means. Item 13. The optical disk device according to item 12.