JPH117639A - Tracking control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tracking control unit capable of stably adjusting the off-set and balance of tracking error signal and acculately adjusting in a short time within one second. SOLUTION: An operation parameter corresponding to the type of disk is set, in that situation the tracking servomotor is put to off state, and the light beam is exited in vibration in the radial direction of disk (step S5); after that the tracking error signal is integrated several times in a prescribed time and in a prescribed area as well (step S8-S12), and the average is calculated (step S14). Control is executed so that this value is settled within a prescribed range (steps S16, S17) and after that the tracking servomotor is put to be on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for recording / reproducing a digital data signal on a disk such as an MD (mini disk) in a predetermined block time unit. The present invention relates to a tracking device that automatically adjusts these (referred to as tracking error states) and a disk device such as an MD player using the same, and more particularly, to a tracking device with improved tracking error measurement accuracy.

[0002]

2. Description of the Related Art Generally, in this type of optical recording / reproducing apparatus,
During recording, the output power (hereinafter referred to as laser power) of a laser that gives a light beam spot to the disk is adjusted in multiple steps according to the wattage specified by the type of disk, and during reproduction, several types (premastered) with different reflectivities are used. The laser power is varied in a plurality of stages with respect to a disc of (MO and MO) and the gain is switched in order to make the reproduction light appropriate, and the offset is adjusted each time this switching is performed. At this time, it is necessary to accurately adjust an adjustment target such as an offset and a balance of the tracking error signal in consideration of compatibility with other devices.

Conventionally, the following method has been known as a method for automatically adjusting the offset and balance of a tracking error signal during recording. That is, when the laser power is increased on the data area, necessary data disappears. Therefore, with the focus servo turned on and the tracking servo turned off, the actuator is moved at a frequency of about 200 Hz in the tracking direction (disc radial direction). By applying vibration, the light beam spot is crossed over a plurality of tracks of, for example, ± number +, and the offset and balance of the tracking error signal are adjusted so that the upper and lower peaks of the reproduction signal obtained from the reflected light become the same. How to

Further, after the tracking servo is turned off, a track jump is performed in track units, and then the tracking servo is turned on (Japanese Patent Laid-Open No. H7-2259).
55) There is a method for preventing necessary data from being destroyed.

[0005]

However, in the above-mentioned conventional method, since peak data is extracted and necessary adjustment is made by comparing the two, the temperature of a reference (reference) voltage for measuring a tracking error is measured. When there is an error in the A / D converter due to a change or the like, or when there is surface runout or disk contamination (dust adhesion), there is a problem that the accuracy and precision of the measurement are impaired.

Further, in the conventional method, there is a problem that A / D conversion cannot be performed continuously and it takes time for processing. MD
In a player, when a user can use a single push button function for recording / reproducing, a single power switch and recording or both a power switch and reproducing switch can be provided by a single mainstream, naturally, recording can be performed instantaneously, It must be able to be played. However, a high-density disk such as an MD has a large variation in products depending on the type of disk and a manufacturer, has many adjustment items, and each adjustment time is too long to be ignored. In particular, it is difficult to adjust the tracking adjustment time, and it is difficult to adjust the tracking adjustment time. Therefore, it has been conventionally expected that the adjustment can be performed reliably, with high accuracy, and in a short time.

The present invention has been made in view of the above-mentioned conventional problems, and provides a tracking control device capable of stably adjusting the offset and balance of a tracking error signal, and of accurately adjusting the tracking error signal in a short time within one second. It is another object of the present invention to provide a disk device having such a tracking control device.

[0008]

In order to achieve the above object, according to the present invention, a drive parameter is set according to the type of a disk, and in that state, a tracking servo is turned off and a light beam is applied in the radial direction of the disk. The tracking error signal is integrated a plurality of times within a predetermined time and in a predetermined area thereafter, an average value thereof is calculated, control is performed so that this value falls within a predetermined range, and then the tracking servo is turned on. I have.

That is, according to the present invention, there is provided a tracking control device for an optical disk device capable of recording and reproducing signals by irradiating a disk with a light beam. According to the discriminating means for discriminating and the type of the disc discriminated by the discriminating means, if the type is ROM, predetermined drive parameters can be set in the ROM area,
Then, parameter setting means capable of setting different predetermined driving parameters for the ROM area and the RAM area, and tracking obtained from a signal reproduced from the disk based on the predetermined driving parameters set by the parameter setting means. Detecting and adjusting means for integrating the error signal and detecting the tracking error integrated signal, and adjusting the state of the tracking error signal;
Vibration means for performing + vibration and -vibration on the light beam to detect the tracking error signal, and detection was performed in an area to be measured after + vibration or -vibration by the vibration means. Tracking error calculating means for calculating an average of a predetermined number of continuous tracking error integrated signals;
And a control unit for controlling the detection / adjustment unit so as to adjust the tracking position based on the tracking error integrated signal calculated by the tracking error calculation unit.

According to the present invention, there is provided a tracking control device for an optical disk device capable of recording and reproducing signals by irradiating a disk with a light beam, wherein the type of the disk to be driven is ROM or RAM. According to different parameters, while detecting a tracking error integrated signal obtained from the signal reproduced from the disk, it is possible to adjust the state of the tracking error signal,
Detecting and adjusting means including an A / D converter having a reference voltage for measuring the tracking error;
Reference voltage correcting means capable of correcting the / D converter reference voltage;
After the reference voltage is corrected by the reference voltage correcting means, the detection / adjustment means averages a predetermined number of tracking error integrated signals detected in the area to be measured after the + excitation and the -excitation. A tracking control device comprising: a tracking error calculation unit; and a control unit that controls the detection / adjustment unit to adjust the tracking position based on the tracking error integration signal calculated by the tracking error calculation unit. Is done.

According to the present invention, there is provided a tracking control device for an optical disk device capable of recording and reproducing a signal by irradiating a disk with a light beam, wherein the tracking control device obtains from a signal reproduced from the disk. Detection / adjustment means capable of detecting the error integrated signal and adjusting the state of the tracking error signal; vibration means for performing vibration for detecting the tracking error signal; and the detection by the vibration means. In order for the adjustment means to function, at least one of + excitation and -excitation is performed at least once, and a predetermined number of tracking error integrated signals continuously detected in an area without turning back after these are averaged. Tracking error calculation means for calculating, and the tracking error integration signal calculated by the tracking error calculation means So that the average value falls within a predetermined range,
There is provided a tracking control device comprising: control means for controlling the detection / adjustment means so as to perform the vibration and the tracking error calculation a required number of times and adjust the tracking position.

According to the present invention, there is also provided a tracking control device for an optical disk device capable of recording and reproducing a signal by irradiating a disk with a light beam, wherein the tracking control device obtains a signal obtained from a signal reproduced from the disk. An A / D converter having a reference voltage for measuring the tracking error, which is capable of detecting an error integration signal and adjusting a state of the tracking error signal;
Detection / adjustment means, reference correction means capable of correcting the reference voltage of the A / D converter, and after the reference voltage is corrected by the reference correction means, the + vibration and the -excitation are performed by the detection / adjustment means. And a tracking error calculating means for averaging a predetermined number of tracking error integrated signals detected in the subsequent measurement area, and the tracking error integrated signal calculated by the tracking error calculating means. In order for the average value of to fall within a predetermined range, the vibration and the tracking error calculation are performed a necessary number of times to adjust the tracking position.
There is provided a tracking control device having control means for controlling the detection / adjustment means.

According to the present invention, a tracking control device for an optical disk device capable of recording and reproducing signals by irradiating a disk whose type is ROM or RAM in advance with a light beam. And
Depending on the type of the disc, if the type is ROM, R
A predetermined driving parameter can be set for the OM area, and if the type is RAM, different predetermined driving parameters can be set for the ROM area and the RAM area, respectively. Detecting and adjusting means for integrating a tracking error signal obtained from a signal reproduced from the disc under a predetermined drive parameter to detect a tracking error integrated signal, and adjusting a state of the tracking error signal; TOC access means for causing the light beam to jump from the outer circumference to the inner circumference of the disk to detect a tracking error signal to access the TOC; and a predetermined predetermined number detected during the jump by the TOC access means. Number of tracking error integrated signals A tracking error calculating means for calculating, and a control means for controlling the detecting / adjusting means to adjust the tracking position based on the tracking error integrated signal calculated by the tracking error calculating means. Provided.

Further, according to the present invention, there is provided a disk drive having any of the above-mentioned tracking control devices.

The present invention has the above-described configuration, selects a measurement area having no aliasing after vibration, uses an integrated value obtained by integrating a tracking error signal obtained in this measurement area, and An average of a sufficiently large number of continuous data can be obtained to increase S / N and improve measurement accuracy.
In addition, the integral value is set to a predetermined value (for example, 3%) necessary and sufficient for practical use.
If it is more than this, the EF balance can be set to ± 1 (differs depending on whether it is premastered or MO) and the measurement can be repeatedly driven to a predetermined value. Therefore, since the integrated value is used, the "blur" at the peak is averaged, the accuracy is improved, and the data is taken in continuously, so that it can be performed in a short time. At this time, the measurement accuracy can be further improved by correcting the reference voltage of the A / D converter. When the present invention is applied to an MD player, it has an unprecedented effect in cost and performance (very short time and high accuracy in recording and reproduction).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a block diagram showing an MD recording / reproducing apparatus to which a tracking device according to the present invention is applied.
FIG. 2 is a circuit diagram showing a main part of the preamplifier in FIG.
FIG. 4 is an explanatory diagram showing a track jump in the apparatus shown in FIG. 1, and FIG. 4 is a timing chart for explaining an operation for adjusting an offset and a balance (referred to as a tracking position) of a tracking error signal.

In FIG. 1, a disk 1 as a recording medium has a track formed in a spiral form from the inner circumference to the outer circumference, and the optical pickup 2 gives a laser beam spot to this track so as to have a predetermined shape. Bibliographic information, audio information, and video information are optically recorded and / or reproduced. The disk 1 is rotated at a constant linear velocity (CLV) by a spindle motor 3 and a motor driver / tracking focus control circuit 4 based on signals read and reproduced by an optical pickup 2. The optical pickup 2 has a superimposer 5 and a traverse motor 6, and operates integrally with a magnetic field modulation head 7.

The optical pickup 2 also has a laser diode LD for emitting a laser beam to the disk 1,
Optical information recorded on the disc 1 is read out based on the reflected light, and reproduced signals RF1 and RF2 are output. Four kinds of focus error signal detection signals A to D and two kinds of tracking error signal detection The signals E and F are output. These signals RF1, RF2, A to F are amplified by the head amplifier 8 with frequency characteristics switched according to the frequency, and output to the preamplifier 9 which operates as a detection / adjustment means. Further, a signal for driving the laser diode LD in the optical pickup 2 is applied from the preamplifier 9 to the head amplifier 8.

The preamplifier 9 outputs a reproduced EFM signal, an ADIP signal, a focus error signal FEO, a tracking error signal TEO, and the like to the EFM modulation / demodulation / error correction / ADIP (address implementation group) / servo circuit 10. . The servo circuit portion in the circuit 10 is constituted by, for example, a DSP (Digital Signal Processor).

The EFM modulation / modulation / error correction / ADIP / servo circuit 10 encodes the recording data at the time of recording, and
The signal is modulated into an FM signal and output to the head 7 via the driver 7a. The circuit 10 also demodulates the EFM signal from the preamplifier 9 at the time of reproduction to perform error correction decoding, and based on the focus error signal FEO and the tracking error signal TEO, the optical pick-up 2 Control is performed via the motor driver / tracking / focus control circuit 4 so as to perform tracking and focusing.

When writing, the microcomputer 11 moves the optical pickup 2 near the innermost periphery of the disk 1, that is,
OC (Table Of Contents) and UTOC (User Table)
Of the tracking error signal TEO, and adjusts the offset and balance of the tracking error signal TEO as described later. This microcomputer 11
Are various signals A to F, FEO, TE from the preamplifier 9
An A / D converter 11a for taking in O and the like, and a laser diode LD in the optical pickup 2 are driven by a signal corresponding to, for example, a 14-bit PWM signal to thereby generate a laser diode L.
PWM unit 11b for controlling the output power of D
, A RAM 11c for a work area and the like, a ROM 11d for a program and the like, and a CP for performing control as described later.
U11e, etc., and these circuits 11a to 11e
They are connected via a bus 11f. Also, the RAM 11
c has an area for storing an integrated value of a tracking error signal and the like so that the CPU 11e performs adjustment described later. The PWM signal from the PWM unit 11b is converted into a DC voltage by a low-pass filter (LPF) 12 and applied to a laser power control circuit (LPC) 22 shown in FIG.
Is driven.

Next, the configuration of the preamplifier 9 will be described in detail with reference to FIG. RF signals RF1 and RF2 input from the optical pickup 2 via the head amplifier 8 are output to the EFM modulation / demodulation / error correction / ADIP circuit 10 as an EFM signal, an ADIP signal, and the like via an information reproduction signal output circuit 21. In order to adjust the focus balance, an envelope signal EFMENV of the EFM signal is detected by the EFMENV detection circuit 21a and output to the A / D converter 11a in the microcomputer 11. Also, output signals A to D of a four-divided sensor (not shown) for detecting a focus error signal are output from the focus balance differential amplifier 23.
F is applied to F to calculate (A + C-B-D). The focus balance voltage determined by the focus balance variable resistance means 24F1 and 24F2 is applied to the + terminal of the differential amplifier 23F. Therefore, the differential amplifier 23F outputs the focus error signal FE of {(α (A + C) −BD)} (α is a coefficient corresponding to the focus balance adjustment amount).

Here, variable resistance means 24F1 and 24F2 for focus balance, variable resistance means 26F for focus gain and variable resistance means 28F for focus offset and variable resistance means 2 for tracking balance described later.
Both 4T1 and 24T2 and the variable resistor 28T for tracking gain are composed of a plurality of variable ladders and analog switches. Two variable resistors 24F1 and 24F2 for focus balance, and variable resistors 24T1 and 24T2 for tracking balance.
Are controlled in conjunction with each other.

These variable resistance means 24F, 26F, 2
The analog switch groups of 8F, 24T, 26T, and 28T correspond to the registers (RAM 11
It is selectively turned on or off based on the focus balance signal FBAL, focus gain signal FG, and focus offset signal TOFS corresponding to the data set in c). Accordingly, the resistance value changes stepwise, and the balance (BAL), gain (G), and offset (OFS) of the focus (F) signal, the balance (BAL), the gain (G), and the balance of the tracking (T) signal are obtained. The offset (OFS) can be adjusted.

The output voltage FE of the differential amplifier 23F is amplified by the focus gain amplifier 25F and the variable resistance means 26F based on the focus gain signal FG. Then, the focus offset differential amplifier 27F and the variable resistance means 28F are amplified. The focus offset signal FO
The focus offset is adjusted based on the FS. This signal is output to the servo circuit 10 and the A / D converter 11a in the microcomputer 11 as a focus error signal FEO.

The polarities of the output signals E and F of the two-divided sensor (not shown) for detecting the tracking error signal from the optical pickup 2 are straightened by the polarity switching circuit 29 based on the polarity selection signal TESEL from the microcomputer 11. And cross. The output signals E and F of the polarity switching circuit 29 are applied to a tracking balance differential amplifier 23T,
3 and the variable resistance means 24T1 and 24T2, when the signal TESEL is straight based on the tracking balance signal TBAL, the tracking error signal (βF−
E) (β is the tracking balance adjustment amount) when the signal TE
If SEL is a cross, the tracking error signal (β
EF) is generated.

This output voltage is amplified by the tracking gain amplifier 25T and the variable resistance means 26T based on the tracking gain signal TG. Then, the differential amplifier 27T for tracking offset and the variable resistance means 2T are amplified.
The offset is adjusted by 8T based on the tracking offset signal TOFS. This signal is used as a tracking error signal TEO by the servo circuit 10 and the microcomputer 1.
1 is output to the A / D converter 11a.

Further, in order to adjust the balance and offset of the tracking error signal TEO, the voltage of the tracking error signal TEO is integrated by an integrating circuit 30 operating as integrating means. This integrated voltage SE is output to the A / D converter 11a in the microcomputer 11. The integration circuit 30 can be reset by a reset signal from the microcomputer 11 immediately after the measurement of the integration voltage SE.

Next, the operation of adjusting the balance and offset of the tracking error signal TEO will be described with reference to FIGS. First, the laser beam of the optical pickup 2 is moved onto the TOC of the disk 1 to read out necessary information, the laser power and the gain of each differential amplifier are initialized, and the tracking error signal TEO is set.
Adjust the balance. In this case, FIGS. 3 (a) and 3 (b)
As shown in (1), the beam is moved to the + side track at the stage "1", to the-side track at the stage "2", and to the + side track at the stage "3". Note that the + side and the-side indicate the outer circumferential direction and the inner circumferential direction from the current track, respectively, and the determination of the + side or the-side is determined by the tracking error signal measured before that. Also, n + 2 and n shown in FIG. 3 indicate the center of the track. The solid line and the dotted line in FIG. 3A show the waveforms of the tracking error signal TE having opposite polarities, and one sine wave (about 700 Hz or more) for one track.
Is positioned by the servo circuit 10 so that the center position of the track at the lower right becomes the center of the track.

Referring to FIG. 4 in detail, first,
The tracking offset TOFS is adjusted so that TE = (E−F) becomes the reference voltage Vref, and the tracking gain TG is adjusted using the value after this adjustment so that the tracking gain TG becomes a predetermined value with respect to Vref. Next, the focus servo is continuously turned on, and the polarities of the signals E and F are fixed in the positive direction as shown in FIG.
As shown in (c), the current flowing through the coil of the tracking actuator is changed in steps "1" to "4" by the access signal.
Are set in, for example, the + direction, the − direction, the + direction, and the − direction. In the stage "1", as shown in FIGS. 4A and 4D, after the tracking servo is turned on in a provisional state where the positive and negative integral values of the tracking error signal TE are not equal in the track "n", 5 ms later. Turn off (m-
n) While jumping tracks (for example, 100 tracks), the access signal is stopped in the middle, and in the measurement area of 5 ms to 10 ms which returns to the vicinity of n by its own weight, the integrating circuit 30 as shown in FIG. The integrated voltage is taken in through the A / D converter 11a, and then the integration circuit 30 is reset as shown in FIG. This fetch is continuously performed a predetermined sufficiently large number of times, for example, 128 times. The average value is used as the tracking error integrated signal SE. If the average value is not less than 3% of the expected worst integrated value, the tracking balance (E−F) is obtained.
Balance) Adjust the TBAL (+1 or -1 depending on the type as described later), and then proceed to the next stage.

Similarly, in steps "2" to "4", the tracking servo is jumped by (mn) tracks near the track "n", and the access signal is stopped in the middle thereof to perform integration. The integrated voltage SE obtained by the integration by the circuit 30 is converted into 1 by the A / D converter 11a.
Take 28 times. And if the average value is less than 3%,
The tracking offset TOFS is adjusted so as to cancel this difference (offset).

Therefore, according to the first embodiment, since the tracking servo is turned on when the tracking servo is turned off and a large number of tracks are jumped, the time for turning off the tracking servo is shortened. In addition, even if an external impact occurs, it is possible to move to a track other than the predetermined track. Also, at least 5ms + 5ms
The adjustment is completed in a short time of 10 ms.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is also realized as a tracking control device of the MD recording / reproducing device shown in FIGS. In this embodiment, the A / D converter 11a has means for correcting a reference (reference) voltage used for the conversion just before detecting the tracking error signal. First, when the power is turned on, the microcomputer 11 is reset (system reset), and when ready to detect a tracking error signal, the input is switched to 0 V (no signal state). = 256) measure, calculate average, subtract this average from reference voltage,
Complete.

<Third Embodiment> Next, an MD player according to a third embodiment will be described with reference to the flowchart of FIG. First, in step S31, the system is initialized, and in step S32, it is determined whether the loaded disk is a RAM type (MO capable of recording and reproduction) or a ROM type (pre-mastered for reproduction only). (Step S33
A), clear the tracking offset (step S
34A), the track jump voltage is set to + excitation (step S35A), and adjustment is performed (step S36A).
Thereafter, reproduction is performed (step S37A). On the other hand, if the RAM type is determined in step S32, the RF amplifier is preset (step S33B), the tracking offset is cleared (step S34B), the track jump voltage is set to + excitation (step S35B), and the adjustment is performed. (Step S36B), and then play or record (step S37B).

The details of steps S36A and S36B in FIG. 6 will be described with reference to a flowchart over FIG. 7 and FIG. First, the track jump is performed in the + direction (forward) (step S5), and after waiting for 5 ms (step S6), the track jump is stopped (+ excitation end:
Step S7) Set a 5 ms timer (Step S7)
8) Clear both the SE counter for counting the number of integration times and the extension counter (step S9), and set the SE integrated value to 5
for 128 ms (step S10)
・ 11 ・ 12) In step S11, the SE counter is incremented (+1), and then it is determined whether or not the count value has become 128 or more. In step S12, it is determined whether the value of the 5 ms timer has become zero or less.

If step S12 is Y (yes),
Since 128 readings have not been completed even after 5 ms, it is known that the measurement was not completed within a predetermined time due to the influence of eccentricity or the like, and the extension counter was incremented (+1), and then the count value was 2 Is determined (step S13). If it cannot be read 128 times (Y at step S12), it is read for 128 times with an additional 5 ms. If it can be read 128 times (step S
11 (Y), an average value calculation is performed (step S1).
4). If the absolute value of the average value is less than 3% (when Y is determined in step S15), the integration measurement process is terminated, and the tracking offset is corrected (step S15).
16).

If the absolute value of the average value is 3% or more,
If the average value is +, the RF EF balance is set to -1 (step S17), and the process returns to step S5. If the absolute value of this average value is 3% or more and the average value is-, R
The FEF balance is set to +1 (step S17), and the process returns to step S5. If N (No) in step S13, the process returns to step S10. If Y is determined in step S13, the process proceeds to step S18, in which the track jump is made in the negative direction (reverse), and the vibration starts. Here, the integral value SE is 12
A 3% comparison is made by measuring eight times and averaging. Steps S19 to S26 after step S18 are performed in step S8.
The description is omitted because it is similar to S11.

In the case of the RAM type, "R"
Since there is an “OM” portion (region) and another “RAM” portion (region), the tracking offset adjustment and the balance adjustment are performed in each of them (that is, at least twice with different parameters). In the procedure for “adjustment” in FIGS. 7 and 8, the selection in step S17 is made different between the ROM and the RAM due to, for example, a difference in the polarity of the EF balance other than the reflectance parameter. There are cases.

Fourth Embodiment The above tracking offset adjustment is performed before recording and / or reproduction on a track to be recorded and / or reproduced. That is, for example, when recording and / or reproduction is started from an outer track, measurement is performed on that track. In the above description, the + excitation time is set to 5 ms, but this is only an example, and a high-speed jump within 1 ms is a half of 2.5 m.
s, so that the time can be further shortened.

<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described focusing on differences from the above-described embodiments. The fifth embodiment differs from the first embodiment described with reference to FIGS. 3 and 4 in the following points. 9 to 1
The operation of adjusting the balance and offset of the tracking error signal TEO will be described with reference to FIG. In addition,
9 to 12 correspond to FIGS. 3, 4, and 6 to 8 described above. That is, the flowchart of FIG. 12 is different from the flowchart of FIG.
4 shows the processing procedure of B. In the corresponding flowcharts, the same processes are indicated by the same step numbers, and the description will be omitted. In the first step S28 in FIG. 12, unlike the case of FIG. 7 described above, the light beam is track-jumped to the outer periphery.

First, after initializing the laser power of the laser beam of the optical pickup 2 and the gain of each differential amplifier, the balance of the tracking error signal TEO is adjusted. In this case, as shown in FIGS. 9A and 9B, the light beam is continuously moved to the step-side track.
.. Shown in FIG. 9 indicate the center of the track. The solid line and the dotted line in FIG. 9A show the waveforms of the tracking error signal TE having opposite polarities.
The servo circuit 10 is positioned so that the center position of one sine wave (approximately 700 Hz or more) at the lower right of the track corresponds to the center of the track.

More specifically, referring to FIG. 10, first, the tracking offset TOFS is adjusted so that TE = (E−F) becomes the reference voltage Vref, and then the value after this adjustment is used to adjust Vref. To adjust the tracking gain TG to a predetermined value. Next, the focus servo is continuously turned on, and FIG.
As shown in FIG. 10, the polarities of the signals E and F are fixed in the positive direction, and as shown in FIG. 10C, the current flowing through the coil of the tracking actuator is set in the negative direction by the access signal. After the tracking servo is turned on in a tentative state where the positive and negative integral values of the tracking error signal TE are not equal, in the measurement area of 5 ms to 10 ms, FIG.
As shown in FIG. 0 (e), the voltage integrated by the integration circuit 30 is captured via the A / D converter 11a (FIG. 1).
2: Step S11), and then reset the integration circuit 30 as shown in FIG. This fetch is continuously performed a predetermined sufficiently large number of times, for example, 128 times. Then, an average value is calculated (step S14), and the obtained average value is used as a tracking error integrated signal SE. If the average value is not less than 3%, a tracking balance (EF balance) is obtained.
Adjust TBAL (Step S17: +
1 or -1), and then proceed to the next stage.

Similarly, the integrated voltage SE obtained by the integration by the integration circuit 30 is output to the A / D converter 11a through the A / D converter 11a.
Take 8 times. If the average value is less than 3%, the tracking offset TOFS is adjusted so as to cancel this difference (offset). Therefore, in the fifth embodiment, the adjustment is completed while the tracking servo is alternately turned on and off to move to the TOC. In addition,
Disc type is ROM due to differences in disc reflectivity
Since it is possible to know whether the disk is a RAM or a RAM, it is possible to know the type of the disk before reading the TOC, and to set drive parameters suitable for each. In the case of the RAM type, since there are an inner ROM area and other RAM areas, the above-described tracking offset adjustment and balance adjustment are performed using different drive parameters. When the processing in FIG. 12 is completed, step S in FIG.
In step 38A or step S38B, the TOC is read, and the flow proceeds to the reproduction in step S37A or the reproduction / recording in step S37B.

<Sixth Embodiment> Next, a sixth embodiment of the present invention will be described, focusing on differences from the fifth embodiment. As shown in the flowchart of FIG. 13, the sixth embodiment omits steps S6 and S7 and compares step S1 with the flowchart of FIG.
The track jump reverse of No. 8 is performed not by the precise access of the pickup but by the coarse access that moves the entire optical pickup in the radial direction of the disk, and the processing of FIG. 12 is performed while the tracking servo is always off. .

[0045]

As described above, according to the present invention, there is provided an MD player which can perform automatic adjustment of tracking in a short time and can easily improve accuracy. Therefore, it is possible to provide a feature that can sufficiently cope with a so-called one-press function that requires stable adjustment in a short time.

[Brief description of the drawings]

FIG. 1 shows an M to which a tracking device according to the present invention is applied.
FIG. 3 is a block diagram illustrating an embodiment of a D recording / reproducing device (player).

FIG. 2 is a circuit diagram showing a main part of the preamplifier of FIG.

FIG. 3 is an explanatory diagram illustrating a track jump according to the first embodiment of the present invention.

FIG. 4 is a timing chart for explaining an operation when adjusting the offset and balance of the tracking error signal according to the first embodiment of the present invention.

FIG. 5 is a circuit diagram showing a main part of the preamplifier of FIG. 1 according to a second embodiment of the present invention.

FIG. 6 is a flowchart illustrating a processing procedure in an MD player according to a third embodiment of the present invention.

7 is the first half of a flowchart specifically showing a part of the flowchart of FIG. 6;

FIG. 8 is a second half of a flowchart specifically showing a part of the flowchart of FIG. 6;

FIG. 9 is an explanatory diagram showing a tracking jump according to a fifth embodiment of the present invention.

FIG. 10 is a timing chart for explaining an operation when adjusting an offset and a balance of a tracking error signal according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing a processing procedure in an MD player according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart specifically showing a part of the flowchart in FIG. 6;

FIG. 13 is a flowchart showing a processing procedure in an MD player as a sixth embodiment of the present invention in which the flowchart of FIG. 12 is partially modified.

[Explanation of symbols]

Reference Signs List 1 optical disk 2 optical pickup 3 spindle motor 4 motor driver / tracking / focus control circuit 5 superimposing device 6 traverse motor 7 magnetic field modulation head 8 head amplifier 9 preamplifier 10 EFM modulation / demodulation / error correction / ADIP (address implement groove) / servo circuit 11 microcomputer (Determination means, parameter setting means, detection / adjustment means, vibration means, tracking error calculation means, control means, reference voltage correction means, T
12 LPF 21 Information reproduction signal output circuit 21a EFMENV detection circuit 22 Laser power control circuit (LPC) 29 Polarity switching circuit 30 Integration circuit

Claims (6)

[Claims] 1. A tracking control device for an optical disk device capable of irradiating a disk with a light beam to record / reproduce a signal, comprising: a determination unit configured to determine whether a type of a disk to be driven is a ROM or a RAM. According to the disc type determined by the discriminating means, predetermined drive parameters can be set for the ROM area if the type is ROM, and RO if the type is RAM.
Parameter setting means capable of setting different predetermined drive parameters for the M area and the RAM area, and a tracking error obtained from a signal reproduced from the disk based on the predetermined drive parameters set by the parameter setting means. Detection / adjustment means for integrating a signal to detect a tracking error integrated signal and adjusting a state of the tracking error signal; and + excitation and -excitation for the light beam for detecting the tracking error signal. And a tracking error calculating means for averaging a predetermined number of continuous tracking error integrated signals detected in an area to be measured after the + or-excitation by the exciting means, The tracking error integration calculated by the tracking error calculation means A control unit for controlling the detection / adjustment unit to adjust the tracking position based on a signal. 2. A tracking control device for an optical disc device capable of recording and reproducing signals by irradiating a disc with a light beam, wherein different parameters are used depending on whether the type of disc to be driven is ROM or RAM. A / D converter having a reference voltage for measuring the tracking error, capable of detecting a tracking error integrated signal obtained from a signal reproduced from the disk and adjusting a state of the tracking error signal. Detection / adjustment means, reference voltage correction means capable of correcting the A / D converter reference voltage, and after the reference voltage is corrected by the reference voltage correction means, + vibration is performed by the detection / adjustment means. And a track for averaging a predetermined number of tracking error integrated signals detected in the area to be measured after the excitation. And Nguera calculation means, to adjust the tracking position on the basis of the tracking error integration signal which is calculated by the tracking error computing means, and control means for controlling said detecting and adjusting means comprises a tracking control unit. 3. The tracking control device according to claim 1, wherein the area to be measured is a track to be recorded. 4. A tracking control device for an optical disk device capable of recording and reproducing a signal by irradiating a disk with a light beam, wherein a tracking error integrated signal obtained from a signal reproduced from the disk is detected. Detection / adjustment means capable of adjusting the state of the tracking error signal; vibration means for performing vibration in order to detect the tracking error signal; and the vibration / vibration means functioning the detection / adjustment means. In order to perform this, at least one of + excitation and -excitation is performed one or more times, and a tracking error calculation is performed by averaging a predetermined number of tracking error integrated signals continuously detected in an area without turning back thereafter. Means, wherein the average value of the tracking error integrated signal calculated by the tracking error calculating means is a predetermined value. As entering the enclosed performs times as necessary the excitation and the tracking error computation, to adjust the tracking position, and control means for controlling said detecting and adjusting means comprises a tracking control unit. 5. A tracking control device for an optical disk device capable of recording / reproducing a signal by irradiating a disk with a light beam, and detecting a tracking error integrated signal obtained from a signal reproduced from the disk. Detection / adjustment means including an A / D converter having a reference voltage for measuring the tracking error, which can adjust the state of the tracking error signal; and a reference voltage of the A / D converter. After correcting the reference voltage by the reference correction means,
Tracking error calculating means for performing at least one of + excitation and -excitation by the detection / adjustment means, and averaging and calculating a predetermined number of tracking error integrated signals detected in the subsequent measurement area; The excitation and tracking error calculations are performed a required number of times so that the average value of the tracking error integration signal calculated by the tracking error calculation means falls within a predetermined range, and the detection / adjustment is performed to adjust the tracking position. And a control means for controlling the means. 6. A tracking control device for an optical disk device capable of irradiating a light beam onto a disk whose type is known in advance as a ROM or a RAM to record / reproduce signals, and Depending on the type of disk, if the type is ROM, R
A predetermined drive parameter can be set for the OM area, and if the type is RAM, parameter setting means capable of setting different predetermined drive parameters for the ROM area and the RAM area, respectively; Detection / adjustment means for integrating a tracking error signal obtained from a signal reproduced from the disk based on a predetermined drive parameter to detect a tracking error integrated signal, and adjusting a state of the tracking error signal; Jumping the light beam from the outer circumference to the inner circumference of the disk to detect a tracking error signal,
TOC access means for accessing the TOC, tracking error calculation means for averaging a predetermined number of continuous tracking error integrated signals detected during the jump by the TOC access means, and calculation by the tracking error calculation means And a control means for controlling the detection / adjustment means to adjust the tracking position based on the tracking error integration signal.