JP2000222747A - Optical disk device and servo parameter adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device in which an adjustment is made to provide an optimum servo parameter for each land/groove track. SOLUTION: The adjusting device is provided with a gain automatic adjusting circuit 131 which adjusts a focus servo gain and a tracking servo gain, and a balance adjusting circuit 132 which adjusts the respective balance of a focus error signal FE and a track error signal TE. An optical head 103 continuously traces only one of the land/groove tracks on an optical disk 101 and the adjustment of each servo gain by the circuit 131 and the balance adjustment of the signal FE by the circuit 132 are conducted for every track of land/groove, the adjustment results are held by a register and the stored and held results are read in accordance with the kind of the track being traced during a recording/reproducing and set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for recording and reproducing information using an optical disk having a plurality of types of tracks having different physical structures, and more particularly to an apparatus for adjusting servo parameters.

[0002]

2. Description of the Related Art Generally, in an optical disk device, a recording medium called an optical disk is irradiated with a light beam from a semiconductor laser focused by an objective lens, and the reflected light is detected by a photodetector to be recorded on the optical disk. The information is reproduced by reading out the signals that are present.

[0003] Further, using a recordable / reproducible medium such as a phase change medium or a magneto-optical medium as an optical disk, information is recorded by causing a phase change or magnetization reversal of a recording film by irradiation of a light beam. Also, an optical disk device capable of recording / reproducing, in which reproduction is detected by detecting reflected light from the optical disk, has been put to practical use.

[0004] In these optical disk devices, a focus servo that exactly matches the focus position of the objective lens with the recording surface of the optical disk and a tracking servo that causes a light beam applied to the optical disk to follow a track are essential. The focus servo and the tracking servo generate a focus error signal and a tracking error signal by calculation from an output signal of a multi-segmented photodetector that detects reflected light from the optical disk, and generate respective focus error signals and tracking error signals based on the focus error signal and the tracking error signal. This is realized by servo-controlling the target.

In consideration of mass production of an optical disk device, the characteristics of a servo loop of a focus servo and a tracking servo including an optical head (hereinafter, simply referred to as servo characteristics) depend on characteristic variations of the optical head with respect to designed characteristics. In general, the amount differs for each apparatus, and also changes with time. Furthermore, considering that the same optical disk device performs reproduction from a plurality of optical disks, even if the optical disk standard is the same, due to factors such as the reflectance of each disk, the difference in pit shape, and the environmental temperature, The focus error signal, tracking error signal, RF signal, and the like change for each disk.

In a conventional optical disk device, the actual variation in servo characteristics caused by these factors is absorbed by adjusting the gain of a servo equalizer, and the adjustment result is stored in a register, and is stored in a register during normal reproduction. By reading the adjustment result and setting it for the servo equalizer, the actual servo characteristics of the optical disk device can be made closer to the designed characteristics.

Further, in the focus error signal and the tracking error signal, a phenomenon appears to be biased with respect to the servo reference level due to a variation in gain balance between the optical system of the optical head and the analog signal processing system. If such a bias is left, correct servo control cannot be performed.

Therefore, in the conventional optical disk device, the amplitude of the RF signal for the focus error signal and the difference between the center of the tracking error signal and the reference level of the servo for the tracking error signal are monitored, respectively. By changing the gain balance in the arithmetic circuit, the balance between the focus error signal and the tracking error signal (these are referred to as focus balance and tracking balance, respectively) is automatically adjusted to correct the above-described bias, and the results of these adjustments are corrected. By storing it in a register and reading the adjustment result stored in this register during normal playback, and setting it in the focus servo system and tracking servo system, respectively,
The focus error signal and the tracking error signal required for the servo are output stably.

However, in the conventional optical disk apparatus having the above-described servo parameter adjusting system, when a DVD-RAM adopting a land / groove method is used among the recordable / reproducible optical disks, a DVD-RAM as described below is used. Problems specific to RAM arise.

In a CD / DVD-ROM, the area on the disc where information is recorded is only the groove, and the information is recorded on a groove track that is continuous from the inner circumference to the outer circumference of the disk. On the other hand, in a DVD-RAM, information is recorded on both tracks of land and groove (land / groove recording). Furthermore, DVD-R
The AM has a so-called single spiral structure in which land tracks and groove tracks are alternately arranged on one continuous spiral. In the single spiral structure, once on each track from the inner circumference to the outer circumference of the disk, at the transition from the last sector of the track to the first sector of the next track, from the land track to the groove track, or from the groove track to the land track. Recording of information /
The playback area changes.

Therefore, it is necessary to stably record / reproduce information on both the land track and the groove track. For this purpose, there is no difference in the servo characteristics between the land track and the groove track during tracing. Is preferred. Therefore, it is desired to adjust the servo loop gain and balance the error signal for both the land track and the groove track. However, there has been no knowledge on how to perform such adjustment conventionally.

[0012]

As described above, in the conventional optical disk device, adjustment of servo parameters such as servo system loop gain and error signal balance is commonly performed for all tracks, and land tracks and groove tracks are adjusted. As described above, it is not possible to adjust servo parameters suitable for each type of track on an optical disc having a plurality of types of tracks having different physical structures. For this reason, there has been a problem that the adjustment of the servo parameters for any of the tracks is inappropriate and good recording / reproduction cannot be performed.

According to the present invention, when recording / reproducing on / from an optical disk having a plurality of types of tracks having different physical structures, servo parameters optimal for each type of track are adjusted and any type of track is adjusted. It is another object of the present invention to provide an optical disk device and a servo parameter adjusting device capable of always performing stable recording / reproduction.

[0014]

In order to solve the above-mentioned problems, the present invention provides an optical disk having a plurality of types of tracks having different physical structures such as a land track and a groove track through an objective lens. In an optical disc apparatus for irradiating a light beam and tracing a track with the light beam to record / reproduce an information signal, a focus servo control means for performing a focus servo control for matching a focus position of an objective lens with respect to the optical disc; Tracking servo control means for performing tracking servo control for causing a light beam to follow a track on an optical disk; adjusting servo parameters of the focus servo control means and the tracking servo control means to store and hold the adjustment result; Record the adjusted result on the optical disc And a servo parameter adjusting means for setting the focus servo control means and the tracking servo control means reads the time of reproduction.

The servo parameter adjusting means adjusts the servo parameters of at least one of the servo parameters for each type of track while continuously tracing one type of track with a light beam. Is stored and retained, and the stored and retained adjustment result is read out and set according to the type of track traced by the light beam during recording / reproducing of the optical disk.

More specifically, the servo parameter adjusting means (a) determines at least the loop gain of each of the focus servo control means and the tracking servo control means among the servo parameters so that one type of track is continuously formed by a light beam. In the traced state, the loop gain is adjusted for each type of track, and the results of each adjustment are stored and held. (B) At least the balance of the focus error signal in the focus servo control means among the servo parameters is determined by the light In the state where one type of track is continuously traced by the beam, the balance of the focus error signal is adjusted for each type of track, and the adjustment results are stored and held.

Further, a servo parameter adjusting device according to the present invention adjusts servo parameters of a focus servo control unit and a tracking servo control unit provided in an optical disk device, and stores and holds an adjustment result of the adjustment unit. There is provided a storage means, and a setting means for reading out the adjustment result stored and held in the storage means at the time of recording / reproducing on the optical disk and setting the readout to the focus servo control means and the tracking servo control means. Then, for at least one of the servo parameters, the servo parameter is adjusted for each type of track in a state where one type of track is continuously traced by a light beam, and each adjustment result is stored and held. The stored adjustment result is read out and set according to the type of track traced by the light beam during recording / reproducing of the optical disk.

More specifically, the servo parameter adjusting device is configured to (a) continuously control one type of track by a light beam for at least the loop gain of each of the focus servo control means and the tracking servo control means among the servo parameters. The loop gain is adjusted for each type of track in a state where the optical beam is traced, and each adjustment result is stored and held. The stored adjustment result is used for the track traced by the light beam when recording / reproducing the optical disk. It is read out and set according to the type, or (b) at least the balance of the focus error signal in the focus servo control means among the servo parameters is determined in such a state that one type of track is continuously traced by a light beam. Various adjustment of error signal balance Each of the adjustment result stored and held by performing the in each track, the light beam the memory retained adjusted results when recording / reproducing of the optical disc is set is read out according to the type of track to be traced.

As described above, according to the present invention, in an optical disk apparatus which performs recording / reproduction on an optical disk having a plurality of types of tracks having different physical structures such as a land track and a groove track, conditions differ depending on the type of the track. For such specific servo parameters, the servo parameters are individually adjusted for each type of track while one type of track is continuously traced by a light beam, and the adjustment results are stored and held. By reading and setting in accordance with the type of track traced by the light beam during actual recording / reproduction, it is possible to adjust servo parameters optimally for each type of track.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (Overall Configuration of Optical Disk Apparatus) FIG. 1 shows the configuration of an optical disk apparatus according to an embodiment of the present invention. In FIG. 1, an optical disk 101 is, for example, a CD-ROM or a DVD-ROM.
A read-only disk such as a VIDEO or DVD-ROM, or a disk capable of both recording and reproduction such as a DVD-RAM composed of a phase change medium or an optical recording medium. It is assumed that these various optical disks can be used. While the optical disc 101 is driven to rotate by a spindle motor 102, information is recorded / reproduced via an optical head 103.

The optical head 103 drives the optical disk 10
1 in the radial direction. The optical head 103 is driven in a focus direction and a tracking direction by, for example, an actuator 105 using an electromagnetic coil.

FIG. 2 is a diagram showing the configuration of the optical system of the optical head 103. In FIG. 2, a laser beam emitted from a semiconductor laser (LD) 201 as a light source is collimated by a collimator lens 202 and then guided to an objective lens 204 via a beam splitter 203. It is narrowed down and radiated on the recording surface of the optical disc 101 as a minute spot. The reflected light from the optical disk 101 irradiated with the laser beam in this manner is reflected by the beam splitter 203 and guided by the condenser lens 205 to the photodetector 206 composed of a multi-segment detector.

The output signal of the photodetector 206 is input to the analog operation circuit 106. In the analog operation circuit 106, the objective lens 20 with respect to the recording surface of the optical disc 101 is
4, a focus error signal FE indicating an error of the focus position (focus error), and a tracking error signal TE indicating an error (tracking error) of the position of the irradiation laser beam with respect to the track on the optical disk 101 in the tracking direction (radial direction of the optical disk 101). , And a full sum signal RF is generated.

FIG. 3 shows an example of a specific configuration of the photodetector 206 and the analog arithmetic circuit 106. Photodetector 206
Has four divided areas 211, 212, 213, 214 obtained by dividing the detection surface into two in the track tangential direction and the track width direction of the optical disc 101 in this example.
It is a split detector. Each divided area 2 of the photodetector 206
Assuming that the output signals from 11, 212, 213 and 214 are A, B, C and D, respectively, the analog arithmetic circuit 106 calculates FE = (A + C)-(B + D) and TE = (A + B)-
By the calculation of (C + D), RF = (A + B + C + D), a focus error signal FE, a tracking error signal TE, and a full addition signal (high-frequency signal) RF are generated.

The analog operation circuit 106 includes the photodetector 2
06 current-voltage conversion amplifiers 221 to 224 and 231 to 23 for converting the output signal (current signal) into a voltage signal.
4, 241 to 244 and a focus error signal calculation unit 2
51, a tracking error signal calculation section 252 and a full addition signal calculation section 253 are provided. Here, the current-voltage conversion amplifiers 221 to 224 and 231 to 234 inserted before the focus error signal calculation unit 251 and the tracking error signal calculation unit 252 are configured by variable gain amplifiers, The gain is controlled by the control signal BC.

Returning to FIG. 1, the analog operation circuit 1
The tracking error signal TE output from 06 is input to the tracking servo equalizer 107, where gain and phase are compensated. Inside the tracking servo equalizer 107, the tracking error signal TE
Is sign-reversed as appropriate by a sign inverter 109 controlled by a land / groove setting signal from the system controller 120, and then input to a multiplier 110 for gain compensation. The gain (loop gain) multiplied by the multiplier 110 is provided by an automatic gain adjustment circuit 131.

The land / groove setting signal is a DVD-R
This signal is used by the system controller 120 to arbitrarily set whether to select a land track or a groove track as a track to be traced on the optical disc 101 which is an AM. In accordance with the land / groove setting signal, whether or not the sign of the tracking error signal FE is inverted by the sign inverter 109 is selected.
It is possible to arbitrarily set the polarity of the tracking servo loop.

The tracking error signal after gain and phase compensation output from the tracking servo equalizer 107 is supplied to the feed motor 104 via the feed motor control circuit 112 and the feed motor driver 113. The feed motor 104 is driven by a feed motor driver 113 under the control of a feed motor control circuit 112, and controls the optical head so that the laser beam from the optical head 103 scans a target track specified by a system controller 120 described later. 103 is moved in the radial direction of the optical disk 101.

The output signal of the tracking servo equalizer 107 is further supplied to an actuator driver 114 for tracking. The actuator 105 is driven by the actuator driver 114 and moves the laser beam emitted from the optical head 103 onto the optical disc 101 in the tracking direction (radial direction of the optical disc 101) so that the tracking error becomes zero.

On the other hand, the focus error signal FE output from the analog arithmetic circuit 106 is input to a focus servo equalizer 108, where gain and phase are compensated. A multiplier 111 in the focus servo equalizer 108 is for gain compensation, and a gain (loop gain) multiplied by the multiplier 111 is given by an automatic gain adjustment circuit 131.

The focus error signal after gain and phase compensation output from the focus servo equalizer 108 is used as the focus servo actuator driver 1.
15. The actuator 105 is driven by the actuator driver 115, and moves the objective lens 204 in the optical head 103 in the focus direction (optical axis direction) so that the focus error becomes zero.

The focus error signal FE and the tracking error signal TE output from the analog operation circuit 106 are also input to the automatic gain adjustment circuit 131, and the tracking error signal TE and the full addition signal RF are also input to the automatic balance adjustment circuit 132. Is done.

The automatic gain adjusting circuit 131 controls the loop gain of the focus servo (hereinafter referred to as focus gain) based on the control from the system controller 120.
And a loop gain of the tracking servo (hereinafter, referred to as tracking gain) are automatically adjusted for each land track and groove track. The adjustment is performed by supplying the signal GC.

The automatic gain adjustment circuit 131 includes registers FOLG, FOGG,
It has TRLG and TRGG. That is, the register FO
LG is a focus gain for a land track (land focus gain), FOGG is a focus gain for a groove track (groove focus gain), and TRL.
G stores the tracking gain for land track (land tracking gain), and TRGG stores the adjustment result of tracking gain for groove track (groove tracking gain).

The automatic balance adjusting circuit 132 automatically adjusts the balance of the focus error signal FE and the balance of the tracking error signal TE in the analog arithmetic circuit 106 for each land track and groove track based on the control from the system controller 120. The balance control signal BC is supplied to the current-voltage amplifiers 221 to 224 in the analog operation circuit 106.
The adjustment is performed by supplying the signals 231 to 234 as gain control signals.

The automatic balance adjustment circuit 132 includes registers FOLBL and FOG for storing the respective adjustment results.
BL, TRLBL, TRGBL. That is, the register FOLBL stores the balance of the land track focus error signal (land focus balance),
GBL is the balance of the focus error signal for the groove track (groove focus balance), TRLBL
The symbol TRGBL stores the adjustment result of the balance of the tracking error signal for the land track (land tracking balance), and TRGBL stores the adjustment result of the balance of the tracking error signal for the groove track (groove tracking balance).

(Reproduction Operation) A reproduction operation from the optical disc 101 in the present embodiment will be described. When reproducing the information recorded on the optical disk 101, the optical disk 10
A reproduction signal corresponding to the information recorded in No. 1 appears in the full addition signal RF signal output from the analog operation circuit 106. This full addition signal RF is supplied to the header signal detection circuit 11.
6, the data signal is input to a data extraction circuit 117, where the data signal portion is extracted and binarized, and a bit clock and a synchronization signal are extracted and generated.

The signal binarized by the data extracting circuit 117 is input to a CD / DVD data signal processing circuit 118, where demodulation and error correction using an ECC RAM 119 are performed. CD / DVD data signal processing circuit 118
The signal demodulated and error-corrected by is input to the video / audio encoder / decoder 121 or the data buffer 122 under the control of the system controller 120.

That is, if the optical disc 101 is, for example, a DV
In the case of a D-VIDEO disc, when a video / audio signal compressed and encoded based on the MPEG2 standard is recorded on the optical disc 101, the data signal after demodulation / error correction is a video / audio encoder based on the MPEG2 standard. The original video signal and audio signal are reproduced by the decoder unit of the / decoder 121 and reproduced.

If the optical disk 101 is a DVD-
If the ROM is a digital data signal other than a video / audio signal, the demodulated and error-corrected data signal is temporarily buffered in the data buffer 120 and sent to a host computer such as a personal computer.

(Recording Operation) Next, a recording operation on the optical disk 101 will be described. When the optical disk 101 is a large-capacity medium such as a DVD-RAM and the information to be recorded is a video / audio signal, the video / audio signal input from the outside is a video / audio encoder based on the MPEG2 standard. / Decoder 12
The data is compression-encoded by one encoder unit to generate encoded data. The generated encoded data is input to the CD / DVD data signal processing circuit 118, and the ECC RAM 1
Error correction coding (ECC encoding) using 19 and modulation are performed. The signal after the error correction encoding / modulation is input to the LD driver 123 while being synchronized with the bit clock, and the LD driver 123 drives the semiconductor laser 201 of FIG.
01 is recorded as a compressed video / audio signal.

If the optical disk 101 is a DVD-
If the information to be recorded is a digital data signal other than a video / audio signal such as a RAM or a CD-R, the data signal input from the outside is buffered in the data buffer 122 and the CD / DVD data signal is After the processing circuit 118 adds ID data, parity bits, and the like, error correction coding (ECC encoding) using the ECC RAM 119 and modulation are performed.
The data signal after the error correction encoding / modulation is input to the LD driver 123 while being synchronized with the bit clock, and the LD driver 123 drives the semiconductor laser 201 of FIG. The signal is recorded.

On the other hand, header information is previously written on the optical disc 101 in the form of pre-pits or the like. When the optical head 101 reads the header information during recording / reproduction on the optical disc 101, all the headers output from the analog arithmetic circuit 106 are read. The header signal is detected by the header signal detection circuit 116 from the addition signal RF. The detected header signal is supplied to the system controller 120, and the optical disk 1
01 is used for servo control in the header part,
The data extraction circuit 117 is used for information extraction in the header.

(Rotation speed control of optical disk) The rotation speed control method of the optical disk 101 is roughly classified into a CLV (constant linear velocity) method and a CAV (constant angular velocity) method. Driven. That is, when the rotation speed control method of the optical disk 101 is the CLV method, the data extraction circuit 117
Is supplied to the spindle motor control circuit 124, and the spindle motor 102 is controlled via the spindle motor driver 125 so that the linear velocity (the relative velocity between the optical disc 101 and the irradiation laser beam) becomes constant.
Is controlled. When the rotation speed control method of the optical disk 101 is the CAV method, the FG signal generated inside the spindle motor 102 is supplied to the spindle motor control circuit 124, and the angular velocity of the optical disk 101, The rotation speed of the spindle motor 102 is controlled so that the rotation speed becomes constant.

(Servo Parameter Adjustment) Next, adjustment of servo parameters (focus gain, tracking gain, focus balance, tracking balance) will be described. The present invention is characterized in that these servo parameters can be adjusted for a plurality of types of tracks (land tracks and groove tracks in the present embodiment) having different physical structures. First, the necessity will be described.

(1) Focus gain adjustment Focus gain (loop gain of focus servo)
Of the focus error signal F
There is a difference in sensitivity of E. The sensitivity of the focus error signal FE is a change amount of the focus error signal FE with respect to a change in the beam waist position of the laser beam near the focus position.

Here, when the optical disk 101 is a DVD-RAM as shown in FIG. 4, pits are formed on both land tracks and groove tracks, and the pit shapes formed on each track are different. possible. Also, since the beam spot on the disk surface is generally larger than the track pitch,
When the laser beam traces a land track, there is interference from an adjacent groove track, and when the laser beam traces a groove track, there is interference from an adjacent land track.

From these facts, the sensitivity of the focus error signal FE may be different between the land track and the groove track. Therefore, during DVD-RAM reproduction, it is necessary to adjust the focus gain for both the land track and the groove track.

(2) Adjustment of Tracking Gain One of the factors that change the tracking gain (tracking servo loop gain) is a difference in the sensitivity of the tracking error signal TE. The sensitivity of the tracking error signal TE is a change amount of the tracking error signal TE with respect to the deviation of the beam spot from the track center near the track center, and is a DVD-R as shown in FIG.
In the case of AM, since it is necessary to turn on tracking in both the land track and the groove track, it is necessary to adjust the tracking gain in both the land track and the groove track.

(3) Focus Balance Adjustment Full addition signal RF output from analog operation circuit 106
Is a reproduction signal corresponding to the information recorded on the optical disk 101, and it is essential to maintain the signal quality at the best in performing reproduction with a low error rate. In general, in the optical head 103 as shown in FIG. 2, when the defocus amount is changed within the depth of focus, the signal quality of the total addition signal RF becomes the best when the signal amplitude is maximized.

Therefore, when such an optical head 103 is used, in order to keep the signal quality of the total addition signal RF at the best, the focus error signal FE is used as a reference when the amplitude of the total addition signal RF becomes maximum. It must be equal to the level. If the focus error balance is lost, that is, if the focus error signal FE is biased to one side with respect to the reference level, the position where the focus error signal FE crosses the reference level will be different from the actual focus position. As a result, the signal quality of the full addition signal RF is degraded.

Here, when the optical disk 101 is a DVD-RAM as shown in FIG. 4, the pit shapes formed on the land track and the groove track may be different as described above, and further, the laser beam is When tracing a land track, there is interference from an adjacent groove track, and when tracing a groove track, there is interference from an adjacent land track.Therefore, the focus balance may be distorted differently between the land track and the groove track. There is. Therefore,
The focus balance needs to be adjusted for both the land track and the groove track.

(4) Adjustment of Tracking Balance The tracking error signal TE is the same signal for the land track and the groove track, and the degree of deviation from the reference level, that is, the tracking balance (balance of the tracking error signal TE) is also the same. . Therefore, when the tracking balance is adjusted, the land track and the groove track are adjusted in principle at the same time. Therefore, it is not necessary to distinguish between the land track and the groove track in the tracking balance adjustment.

(Operation Example of Servo Parameter Adjustment)
An actual operation example of the servo parameter adjustment according to the present embodiment will be described with reference to FIGS. FIG. 5 is a diagram showing a procedure for adjusting a servo parameter and a procedure for storing an adjustment result in a register. FIG. 6 shows an operation procedure during normal reproduction using the servo parameter stored in the register.

[Step S1] First, after the gains of the current-voltage conversion amplifiers 221 to 224 and 231 to 234 in the analog operation circuit 106 are initialized by setting the head amplifier command, the laser beam is turned off, and the focus servo and tracking are performed. The servo is turned off (the servo loop is open), and the focus offset and the tracking offset are adjusted by taking in the electrical offset. In addition, when it is desired to simultaneously take in an offset due to stray light and correct the offset, the offset adjustment may be performed with the laser beam turned on. These offset adjustments are common to the land track and the groove track. The offset adjustment result is stored in a register (not shown).

[Step S2] After the offset adjustment in step S1 is completed, the laser beam is turned on and the focus servo is also turned on, and the balance is adjusted as follows. In this case, the offset adjustment result stored in the offset adjustment result storage register is stored in the analog arithmetic circuit 1.
06.

In this example, the tracking balance is adjusted first. However, as described above, it is not necessary to distinguish between the land track and the groove track, and it is considered that the tracking balance can be used in common. Registers TRLBL, TRGB
The same value is written in L as the adjustment result of the land tracking balance and the groove tracking balance.
If the tracking balance differs between a plurality of types of tracks having different physical structures, the register TR
Individual adjustment results may be written to each track in registers corresponding to LBL and TRGBL.

Next, a groove track is designated by a land / groove setting signal, and only the groove track is continuously traced. At this time, since the adjustment of the tracking balance has been completed, the value of the adjustment result stored in the register TRGBL in the automatic balance adjustment circuit 132 is read and the analog tracking circuit 106 sets the groove tracking balance.

On the other hand, since the focus balance adjustment and the gain adjustment in the groove track have not been performed, the default value “00” is set to the analog arithmetic circuit 106. During this period, the focus balance in the groove track is adjusted, and the result of the groove focus balance adjustment is written to the register FOGBL in the automatic balance adjustment circuit 132.

Thereafter, the land track is designated by the land / groove setting signal, and only the land track is continuously traced. At this time, since the adjustment of the tracking balance has been completed, the value of the adjustment result stored in the register TRLBL is read out and set for the analog arithmetic circuit 106 for the tracking balance.

On the other hand, since the focus balance and the gain adjustment in the land track are not performed, the default value “00” is set to the analog arithmetic circuit 106. During this period, the focus balance in the land track is adjusted, and the land focus balance adjustment result is written to the register FOLBL in the automatic balance adjustment circuit 132.

[Step S3] Next, a groove track is designated by a land / groove setting signal, and only the groove track is continuously traced. The focus gain and tracking gain of the groove track are adjusted as follows.

That is, at this stage, steps S1, S
Since the offset adjustment and the balance adjustment have been completed in step 2, the offset adjustment result stored in the offset adjustment result storage register and the registers FOGBL, TRGB
The focus balance and tracking balance adjustment results of the groove track stored in L are read out and set to the analog arithmetic circuit 106.

During this period, the focus gain and tracking gain of the groove track are adjusted, and the register FOG in the automatic gain adjusting circuit 131 is adjusted.
The adjustment results of the groove focus gain and the groove tracking gain are written to G and TRGG, respectively.

[Step S4] Next, a land / groove is designated by a land / groove setting signal, and only the land track is continuously traced. The focus gain and tracking gain of the land track are adjusted as follows.

In this case as well, as in step S3, since the offset adjustment and balance adjustment have been completed in steps S1 and S2, the offset adjustment result stored in the offset adjustment result storage register and the register FOLB
The adjustment results of the focus balance and tracking balance of the land track stored in L and TRLBL are read and set to the analog arithmetic circuit 106.

During this period, the focus gain and tracking gain of the land track are adjusted, and the registers FOLG, FOLG,
The adjustment results of the land focus gain and the land tracking gain are written to the TRLG.

With the above steps S1 to S4, the operation of adjusting all the servo parameters and storing the adjustment result is completed.
The order of adjusting the servo parameters is not limited to that shown in FIG. 5 and can be variously changed.

At the time of normal recording / reproducing, as shown in FIG. 6, the land track and the groove track are switched and traced for each round of the optical disk 101. At this time, each adjustment result is switched for each land track and groove track. By setting the analog arithmetic circuit 106, the focus servo equalizer 107, and the tracking servo equalizer 108 while recording / reproducing while changing the characteristics, the characteristics closer to the designed servo characteristics for both the land track and the groove track are actually achieved. Can be reproduced on the same device.

[0070]

As described above, according to the present invention, when recording / reproducing is performed on an optical disk having a plurality of types of tracks having different physical structures such as a land track and a groove track, the type of the track is determined. For specific servo parameters whose conditions such as reflectivity and pit shape differ depending on the type, the servo parameters are adjusted individually for each type of track while one type of track is continuously traced by a light beam. The adjustment results are stored and held, and read out and set in accordance with the type of the track traced by the light beam at the time of actual recording / reproduction, so that the optimum servo parameter adjustment for each type of track is performed. It can be carried out.

That is, variations in actual servo characteristics caused by variations in disk manufacturing, such as differences in reflectivity and pit shape, and variations in device characteristics are absorbed by adjusting servo parameters individually for each track. As a result, servo characteristics closer to the design values can be reproduced on an actual optical disk device, and the reliability of the device is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a specific configuration of an optical system of the optical head according to the embodiment.

FIG. 3 is an exemplary block diagram showing an example of a specific configuration of a photodetector and an analog arithmetic circuit according to the embodiment.

FIG. 4 is a perspective view and an enlarged plan view illustrating a track format of a DVD-RAM, which is an example of an optical disk having a plurality of types of tracks having different physical structures.

FIG. 5 is an exemplary view for explaining a servo parameter adjustment procedure in the embodiment.

FIG. 6 is an exemplary view for explaining how to use a servo parameter adjustment result during normal reproduction in the embodiment;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 101 ... Optical disk 102 ... Spindle motor 103 ... Optical head 104 ... Feed motor 105 ... Actuator 106 ... Analog arithmetic circuit 107 ... Tracking servo equalizer 108 ... Focus servo equalizer 109 ... Sign inverter 110,111 ... Gain multiplier 112 ... Feed motor control Circuit 113: Feed motor driver 114: Tracking actuator driver 115: Focus actuator driver 116: Header signal detection circuit 117: Data extraction circuit 118: CD / DVD data signal processing circuit 119: ECC RAM 120: System controller 121: Video -Audio encoder / decoder 122 ... data buffer 123 ... LD driver 124 ... spindle motor control circuit 125 ... Dollar motor driver 131 ... automatic gain adjustment circuit 132 ... balance automatic adjusting circuit 211 to 214 ... division area 221～224,231～234 ... variable-gain current -
Voltage conversion amplifiers 241 to 244 Current-voltage conversion amplifier 251 Focus error signal calculation unit 252 Tracking error signal calculation unit 253 Full addition signal calculation unit

Claims (7)

[Claims] An optical disk having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In an optical disc device for performing reproduction, a focus servo control means for performing focus servo control for matching a focus position of the light beam to the optical disc, and a tracking servo control for following a light beam to a track on the optical disc Tracking servo control means; adjusting the servo parameters of the focus servo control means and the tracking servo control means to store and hold the adjustment result; reading out the stored and held adjustment result at the time of recording / reproduction of the optical disc; A servo parameter adjusting means for setting the control parameter and the tracking servo control means, wherein the servo parameter adjusting means is configured to perform at least one of the servo parameters by one type of track by the light beam. The servo parameters are adjusted individually for the one type of track in a state in which the light beam is continuously traced, and the adjustment results are stored and held. An optical disc device for reading and setting according to the type of a track to be traced. 2. An optical disc having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In an optical disc device for performing reproduction, a focus servo control means for performing focus servo control for matching a focus position of the light beam to the optical disc, and a tracking servo control for following a light beam to a track on the optical disc Tracking servo control means; adjusting the servo parameters of the focus servo control means and the tracking servo control means to store and hold the adjustment result; reading out the stored and held adjustment result at the time of recording / reproduction of the optical disc; A servo parameter adjusting means for setting the control parameter and the tracking servo control means, wherein the servo parameter adjusting means includes at least the focus servo control means and the track in the servo parameters. For each loop gain of the servo control means, the loop beam is adjusted for each type of track in a state where one type of track is continuously traced by the light beam, and each adjustment result is stored and held. An optical disk device, wherein the stored and held adjustment result is read out and set according to the type of track traced by the light beam during recording / reproduction of the optical disk. 3. An optical disk having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In an optical disc device for performing reproduction, a focus servo control means for performing focus servo control for matching a focus position of the light beam to the optical disc, and a tracking servo control for following a light beam to a track on the optical disc Tracking servo control means; adjusting the servo parameters of the focus servo control means and the tracking servo control means to store and hold the adjustment result; reading out the stored and held adjustment result at the time of recording / reproduction of the optical disc; Servo parameter adjusting means for setting the control parameter and the tracking servo control means, wherein the servo parameter adjusting means focuses on at least the focus servo control means among the servo parameters. As for the balance of the error signal, the balance of the focus error signal is adjusted for each type of track in a state where one type of track is continuously traced by the light beam, and each adjustment result is stored and held. An optical disc device, wherein the stored and held adjustment result is read and set according to the type of track traced by the light beam during recording / reproducing of the optical disc. 4. The optical disk device according to claim 1, wherein the optical disk has a land track and a groove track as the plurality of types of tracks. 5. An optical disk having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In a servo parameter adjusting device for adjusting a servo parameter of an optical disk device performing reproduction, an adjusting device for adjusting servo parameters of a focus servo control device and a tracking servo control device provided in the optical disk device, and an adjustment result of the adjusting device. Storage means for storing and holding, and setting means for reading out the adjustment result stored and held in the storage means at the time of recording / reproducing of the optical disc and setting the adjustment result for the focus servo control means and the tracking servo control means, For at least one of the parameters, the servo parameters are adjusted individually for the one type of track in a state where one type of track is continuously traced by the light beam, and the adjustment result is stored and held. The adjusted result is A servo parameter adjusting device for an optical disc device, wherein the servo parameter adjusting device reads and sets according to the type of a track traced by the light beam when recording / reproducing a disc. 6. An optical disk having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In a servo parameter adjusting device for adjusting a servo parameter of an optical disk device performing reproduction, an adjusting device for adjusting servo parameters of a focus servo control device and a tracking servo control device provided in the optical disk device, and an adjustment result of the adjusting device. Storage means for storing and holding, and setting means for reading out the adjustment result stored and held in the storage means at the time of recording / reproducing of the optical disc and setting the adjustment result for the focus servo control means and the tracking servo control means, Regarding at least the loop gain of each of the focus servo control means and the tracking servo control means among the parameters, adjustment of the loop gain is performed for each type of track while one type of track is continuously traced by the light beam. Each adjustment result is stored and held for each disc, and the stored adjustment result is read out and set according to the type of track traced by the light beam during recording / reproducing of the optical disk. Parameter adjustment device for optical disc drive. 7. An optical disk having a plurality of types of tracks having different physical structures is irradiated with a light beam, and the track is traced by the light beam to record / record an information signal.
In a servo parameter adjusting device for adjusting a servo parameter of an optical disk device performing reproduction, an adjusting device for adjusting servo parameters of a focus servo control device and a tracking servo control device provided in the optical disk device, and an adjustment result of the adjusting device. Storage means for storing and holding, and setting means for reading out the adjustment result stored and held in the storage means at the time of recording / reproducing of the optical disc and setting the adjustment result for the focus servo control means and the tracking servo control means, With regard to the balance of the focus error signal in at least the focus servo control means among the parameters, the balance of the focus error signal is adjusted by adjusting the balance of the focus error signal while continuously tracing one type of track by the light beam. An optical disc, wherein each adjustment result is stored and held, and the stored adjustment result is read and set according to the type of track traced by the light beam during recording / reproducing of the optical disc. Device servo parameter adjustment device.