JPH10162485A - Digital servo adjusting method for disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time required for a data reading and reproducing after a power-up or a disk mounting by performing automatic adjustments of digital servos of an optical pickup in parallel with the reading of disk information (TOC). SOLUTION: After the normal chucking of a disk 1, a system controller 19 supplies initial values to a system controller 16 and initializes respective servo circuits 4, 7, 10, 12 to perform the automatic adjustment (first automatic adjustment) of a focus offset, a tracking offset and a tracking balance. Moreover, the controller turns a tracking servo and a spindle servo on and performs the automatic adjustment (second automatic adjustment) of a focus balance, a focus gain and a tracking gain while reading the TOC information from the disk 1. When the second automatic adjustment is not completed even though the reading of the TOC information is finished, the controller interrupts the automatic adjustment and moves a pickup 5 to a target position and then resumes the second automatic adjustment in parallel with the reproducing of data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD (Compact Diode).
sk), CD-ROM, MD (Mini Disk) or DVD
The present invention relates to a method for adjusting a digital servo of a disk device for reading data from a disk using an optical pickup such as a (Digital Versatile Disk).

[0002]

2. Description of the Related Art Data such as music is recorded on a compact disk (hereinafter referred to as a CD) and a mini disk (hereinafter referred to as an MD) in a spiral or concentric manner by extremely small pits or magnetic domains on the disk surface.
In disk devices such as CD players and MD players,
The laser beam emitted from the optical pickup is focused on the signal surface of the disk, and a pit row or a magnetic domain row (hereinafter, referred to as a track) is traced, and data is read by detecting reflected light from the signal surface with the optical pickup. It is supposed to do.

[0003] The signal surface of the disk is constantly displaced due to surface deflection when the disk is rotating, and the track is also constantly displaced due to core deflection when the disk is rotating. For this reason, disk drives such as CD players and MD players are provided with a focus servo and a tracking servo in order to maintain a state in which the laser light is always focused on the signal surface and to enable the laser light to track the track. Equipped with a pickup servo.

In order to read a recording signal from a disk without error, it is necessary to adjust the servo characteristics of the pickup servo to an optimum state. Electronic circuits constituting the pickup servo include an analog servo circuit and a digital servo circuit. In the case of an analog servo circuit, a semi-fixed resistor for servo characteristics adjustment is provided on the board, and the manufacturer adjusts the semi-fixed resistance while reproducing the reference disk before shipping the product, so that the servo characteristics are optimized It is assumed that.

However, in the analog servo circuit, the servo characteristics change when the optical characteristics, actuator characteristics, circuit coefficients, etc. of the pickup change due to long-term use or environmental changes (temperature changes, etc.). There is a disadvantage that. When the servo characteristics are poor, out-of-focus and out-of-tracking are likely to occur due to vibration, scratches on the disk, etc., which may cause sound interruption or sound skipping. In particular, in the case of an in-vehicle audio device, since the vibration is severe, if the servo characteristics are poor, sound skipping or skipping frequently occurs.

In recent years, digitalization of electronic circuits of audio devices has been advanced, and pickup servo circuits of CD players have also been digitized. Some CD players automatically adjust the pickup servo when the power is turned on or a disc is loaded. In this type of CD player, the pickup servo is always adjusted to an optimal state, so that the playability is good, and even if vibration is applied, sound interruption or sound skipping does not easily occur.

FIG. 14 is a flowchart showing a method for adjusting the digital pickup servo of the above-mentioned conventional CD player. First, when the power of the CD player is turned on in step 200, the process proceeds to step 201 to check the chucking state of the disc. If the disc is already chucked (YES), step 205
Directly, and if not chucked (in the case of NO), the process proceeds to step 202. In step 202, the state of insertion of the disk is checked, and the process waits until the disk is inserted. Then, when the disc is inserted, step 2
Go to 03 and load the disc. afterwards,
In step 204, the chucking state of the disk is checked.
After the chucking is completed, the process proceeds to step 205.

In step 205, the digital servo is initialized. That is, the microcomputer in the CD player transmits a predetermined initial value to the servo circuit,
Initialize each servo circuit. Next, step 206
Then, the offset of the focus servo is adjusted with the laser light source of the optical pickup turned off. In addition, the process proceeds to step 207 to adjust the offset of the tracking servo.

Next, the routine proceeds to step 208, where the laser light source is turned on and the spindle motor is rotated to adjust the tracking balance. Next, in step 209,
Adjust the focus balance. Then, step 21
After shifting to 0 and adjusting the focus gain, the process shifts to step 211 to adjust the tracking gain.

After the digital servo adjustment from the focus offset adjustment to the tracking gain adjustment is completed, the process proceeds to step 212 to check whether the TOC information has been read. The TOC information is information such as the number of music pieces recorded on the disc, the playing time of each music piece, and track information. The TOC information is recorded in a lead-in area on the inner circumference side of the disc.

If it is determined in step 21 that the TOC information has already been read, the flow directly proceeds to step 216. On the other hand, if the TOC information has not been read, the process proceeds to step 213, where the optical pickup is moved to a predetermined position in the lead-in area of the disc, and the reading of the TOC information is started. Then, at step 215, T
Wait until the OC read is completed, then step 216
Move to

In step 216, a target search is performed. That is, the optical pickup is moved to the start position of the first song in the program area of the disc or to the start position of the song set by the user. Then, step 21
Then, the process goes to step 7 to read the data from the disk and reproduce the music.

[0013]

However, in the conventional method of adjusting the digital servo of a digital device, the TOC information is read after the focus offset adjustment and the tracking gain adjustment are sequentially performed as described above, and then the data is reproduced. Is performed, the time from when the disc is loaded to when the sound is actually output is long.
It takes about a second.

From the above, it is an object of the present invention to provide a disk drive capable of automatically adjusting the pickup servo at power-on or each time a disk is loaded, and shortening the time from power-on or disk loading to the start of data reading. An object of the present invention is to provide a digital servo adjustment method.

[0015]

The object of the present invention is to simultaneously execute the reading of the disk information of the loaded disk and the adjustment of the digital servo of the optical pickup, and after the reading of the disk information is completed. When the adjustment of the digital servo of the optical pickup is not completed, the adjustment of the digital servo is stopped, the optical pickup is moved to a target position, and thereafter, data is read from the disk, and the digital servo of the optical pickup is adjusted. The problem is solved by a method for adjusting the digital servo of the disk device, characterized by continuing the adjustment of the disk drive.

Further, the above-described problem is that after the disc is loaded, the digital servo is turned off to execute at least the focus offset adjustment and the tracking offset adjustment, and after the focus offset adjustment and the tracking offset adjustment are completed, the digital offset is completed. Turn on the servo, and in parallel with reading the disk information from the disk, execute focus balance adjustment, focus gain adjustment and tracking gain adjustment,
When the reading of the disk information is completed, the focus balance adjustment, the focus gain adjustment and the tracking gain adjustment are not completed when the adjustment is stopped, and the optical pickup is moved to the target position of the disk. A digital servo adjustment method for a disk device, characterized in that the focus balance adjustment, the focus gain information and the tracking gain adjustment are continued in parallel with the reading of data from the disk.

The operation of the present invention will be described below. In the present invention, the digital servo adjustment of the optical pickup is performed in parallel with reading the disk information from the disk. This makes it possible to reduce the time from turning on the power or loading the disk to actually starting data reproduction, as compared with the conventional method of reading the disk information after the digital servo adjustment of the optical pickup is completed. .

There are two types of adjustment of the digital servo of the optical pickup of the disk drive: one that cannot be adjusted unless the servo is off, and one that cannot be adjusted unless the digital servo is on. For example, focus offset adjustment and tracking offset adjustment cannot be performed when the servo is on, and focus balance adjustment, focus gain adjustment, and tracking gain adjustment cannot be performed unless the servo is on. For this reason, in the second invention of the present application, first, the focus offset adjustment and the tracking offset adjustment are performed, then the digital servo is turned on, and the disc information (T
In parallel with reading out the OC information, etc., the focus balance adjustment, the focus gain adjustment, and the tracking gain adjustment are executed. If the focus balance adjustment, the focus gain adjustment, and the tracking gain adjustment are not completed even after the reading of the disc information is completed, these adjustments are temporarily stopped, and the optical pickup is moved to the target position. The adjustment is continued in parallel with the reading of the data. As a result, the time from when the power is turned on or when the disk is loaded to when the data reading is actually started is significantly reduced as compared with the conventional case.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. (First Embodiment) FIG. 1 is a block diagram showing an example in which the digital servo automatic adjustment method of the present invention is applied to a CD player.

Reference numeral 1 denotes a disk (CD) on which music to be reproduced is recorded, and 2 denotes a turntable on which the disk 1 is mounted. The loaded disc 1 is chucked by being sandwiched between a turntable 2 and a holding plate (not shown). Reference numeral 3 denotes a spindle motor for rotating the disk 1 together with the turntable 2, and reference numeral 4 denotes a spindle servo circuit for driving and controlling the spindle motor 3. Reference numeral 5 denotes an optical pickup that irradiates the disk 1 with a laser beam and reads out data recorded on the disk 1 by the reflected light. The optical pickup 5 outputs (A + C) and (B + D) signals obtained from the main spot of the laser beam, and E and F signals obtained from the side spots.

Reference numeral 6 denotes a sled motor for moving a sled (not shown) to which the optical pickup 5 is attached in the radial direction of the disk 1, and 7 a sled servo circuit for driving and controlling the sled motor 6. Reference numeral 8 denotes an RF amplifier that amplifies the signal output from the optical pickup 5,
The F-amplifier 8 outputs a current-voltage converted (A + C) signal, (B + D) signal, E signal, F signal, and RF signal. The configuration of the RF amplifier 8 will be described later.

Reference numeral 9 denotes a digital signal processor (DSP), and the RF output from the RF amplifier 8
A digital signal processing circuit that digitally processes a signal and outputs a digital audio signal. Reference numeral 22 denotes a D / D that converts a digital audio signal into an analog audio signal.
A converter. Reference numeral 10 denotes a focus servo circuit that generates a focus error signal FE based on the (A + C) signal and the (B + D) signal input via the RF amplifier 8,
Details of the focus servo circuit 10 will be described later. 11
Reference numeral denotes a servo driver that drives a focus actuator (not shown) of the optical pickup 5 based on a focus error signal FE output from the focus servo circuit 10 and focuses a laser beam on a signal surface of the disk 1.

Reference numeral 12 denotes a tracking servo circuit for generating a tracking error signal TE from the E signal and the F signal input via the RF amplifier 8, and details of the tracking servo circuit 12 will be described later. 13 is a tracking error signal T output from the tracking servo circuit 12.
A servo driver that drives a tracking actuator (not shown) of the optical pickup 5 based on E and causes the laser beam to track the track on the disk 1.

Reference numeral 14 denotes a detection circuit for detecting the lower envelope of the RF signal, reference numeral 15 denotes an A / D converter for A / D converting the output of the detection circuit 14, and reference numeral 16 denotes a spindle based on a signal from a system controller 19 to be described later. The servo controller controls the servo circuit 4, the thread servo circuit 7, the focus servo circuit 10, and the tracking servo circuit 12.

Reference numeral 19 denotes a system controller constituted by a microcomputer, which controls the digital signal processing circuit 9 and the servo controller 16. 17 is a chucking detector for detecting the chucking state of the disk 1, 18 is a loading unit for loading or unloading the disk 1 under the control of the system controller 19, 20 is a RAM for storing various data and the like,
Reference numeral 21 denotes an operation unit provided with various operation keys. These chucking detection unit 17, loading unit 18, RA
The M20 and the operation unit 21 are also connected to the system controller 19.

FIG. 2 is a block diagram showing the configuration of the RF amplifier 8. Reference numerals 8a and 8b denote current-voltage converters (IV) for current-voltage conversion of the (A + C) signal and the (B + D) signal input from the optical pickup 5. These currents-
The output of the voltage converters 8a and 8b is the focus servo circuit 1.
0 is transmitted. An adder 8e adds the outputs of the current-voltage converters 8a and 8b and outputs the result as an RF signal.
Reference numerals 8c and 8d denote current-voltage converters (I-V) for current-voltage conversion of the E signal and the F signal input from the optical pickup 5.
V). Outputs of these current-voltage converters 8c and 8d are transmitted to the tracking servo circuit 12.

FIG. 3 is a block diagram showing the configuration of the focus servo circuit 10. 10a and 10b are RF amplifiers 8
This is a variable gain amplifier for amplifying the (A + C) signal and the (B + D) signal input from the A / D converter. These variable gain amplifiers 1
The amplification factors of 0a and 10b are changed by a signal from the servo controller 16. Reference numeral 10c denotes a subtractor that subtracts the output of the amplifier 10b from the output of the amplifier 10a and outputs a focus error signal FE. Reference numeral 10d denotes an A / D converter that performs analog / digital conversion on the output of the subtractor 10c. The output of the A / D converter 10d is input to the servo controller 16. 10e is a subtractor for subtracting the output of the A / D converter 10d from the offset value given from the servo controller 16, and 10f is a loop for boosting the low-frequency gain of the output of the subtractor 10e and compensating for the high-frequency phase. The filter 10g is a variable gain amplifier that amplifies the output of the loop filter 10f. This variable gain amplifier 1
In the case of 0 g, the amplification factor changes according to the signal from the servo controller 16. A switch 10h is connected at one end to the output terminal of the amplifier 10g, and is turned on / off by a signal from the servo controller 16. 10j is switch 1
0h is an adder connected to the other end of the
The input terminal of 0j is connected to the servo controller 16. Reference numeral 10i denotes a variable frequency oscillator oscillated by a signal from the servo controller 16, and an output of the variable frequency oscillator 10i is connected to an adder 10j. Reference numeral 10k denotes a D / A converter for digital-to-analog conversion of the output of the adder 10j, and this D / A converter 10k
Is supplied to the servo driver 11.

FIG. 4 is a block diagram showing the configuration of the tracking servo circuit 12. 12a and 12b are variable gain amplifiers for amplifying the E signal and the F signal input from the RF amplifier 8. These variable gain amplifiers 12a, 12b
The amplification factor changes according to a signal from the servo controller 16. 12c is an output of the amplifier 12a from the output of the amplifier 12a.
A subtractor 12b subtracts the output of b to output a tracking error signal TE, and 12d denotes an A / D converter for converting the output of the subtractor 12c from analog to digital. This A /
The output of the D converter 12d is input to the servo controller 16. 12e is a subtractor for subtracting the output of the A / D converter 12d from the offset value given from the servo controller 16, and 12f is a loop for boosting the low-frequency gain of the output of the subtractor 12e and compensating for the high-frequency phase. The filter 12g is a variable gain amplifier that amplifies the output of the loop filter 12f. The gain of the variable gain amplifier 12g changes according to the signal from the servo controller 16. A switch 12h is connected at one end to the output terminal of the amplifier 12g, and is turned on / off by a signal from the servo controller 16. An adder 12j is connected to the other end of the switch 12h. The input end of the adder 12j is connected to the servo controller 16. Also,
Reference numeral 12i denotes a variable frequency oscillator which oscillates according to a signal from the servo controller 16;
The output of 2i is connected to the adder 12j. 12k is D / for converting the output of the adder 12j to digital / analog conversion.
The output of the D / A converter 12k is provided to the servo driver 13.

Before describing the operation of the CD player, digital servo adjustment of the CD player will be described below. In the case of a CD player, there are six types of digital servo adjustment of the optical pickup: focus offset adjustment, tracking offset adjustment, tracking balance adjustment, focus balance adjustment, focus gain adjustment, and tracking gain adjustment. Among these, and are adjustments that cannot be performed when the pickup servo is on, and are adjustments that cannot be performed unless all the pickup servos are on.

Therefore, it is conceivable that, after the pickup servo is turned off and the steps (1) and (2) are executed, the pickup servo is turned on and the steps (1) and (2) and the TOC read are executed in parallel. Hereinafter, the adjustment performed when the pickup servo is turned off is referred to as a first automatic adjustment, and the adjustment performed when the pickup servo is turned on is referred to as a second automatic adjustment.

When the TOC read and the second automatic adjustment are simply performed in parallel, as shown in FIG. 5, when the time required for the TOC read is longer than the time required for the second automatic adjustment, the actual time after loading the disk is actually reduced. The effect of shortening the time until the reproduction is started is great. However, as shown in FIG.
If the time required for the TOC read is shorter than the time required for the second automatic adjustment, a waiting time occurs between the end of the TOC read and the start of the target search, and the time from when the disc is loaded to when the reproduction is actually started. The effect of shortening the time is not sufficient. Therefore, in the present embodiment, further optimization is realized as described below.

FIGS. 7 to 10 are flowcharts showing a method for automatically adjusting the digital servo according to the present embodiment. First, in step 100, when the power of the CD player is turned on, the process proceeds to step 101, and the system controller 19 checks the chucking state of the disc via the chucking detector 17. If the disc 1 is already chucked (YES), the step 1
Go directly to 05. On the other hand, if NO in step 101, the process proceeds to step 102, where the state of disc insertion is checked, and the process waits until the disc 1 is inserted. Step 102
When the disc 1 is inserted at step 103, the process proceeds to step 103.
The loading unit 18 operates to load the disc 1, and in step 104, the disc insertion detector 17
Checks the chucking state of the disk 1. Disc 1
Is normally chucked, the process proceeds from step 104 to step 105.

In step 105, the system controller 19 gives an initial value to the servo controller 16 according to the set program, and the servo controller 16 sets each of the servo circuits 4, 7, 10, and 12 to an initial state. After that, the first automatic adjustment (focus offset adjustment, tracking offset adjustment, and tracking balance adjustment) is executed. That is, the process proceeds to step 106, where the system controller 19 controls the servo controller 16 to adjust the focus offset. Specifically, the output of the A / D converter 10d shown in FIG. 3 is read in a state where the laser light source of the optical pickup 5 is turned off, a focus offset amount is obtained, and an offset (argument) is given to the subtractor 10e. When the current-voltage converters 8a, 8b of the RF amplifier 8, the variable gain amplifiers 10a, 10b, and the subtractor 10c of the focus servo circuit 10 are in a balanced state, the focus offset is zero. The offset amount given to the subtractor 10e is determined so that the output of the subtractor 10e becomes zero.

Next, the routine proceeds to step 107, where tracking offset adjustment is performed. In the tracking offset adjustment, the output of the A / D converter 12d of the tracking servo circuit 12 is read with the laser light source turned off, the tracking offset amount is obtained, and the offset (argument) is given to the subtractor 12e. Next, the process proceeds to step 108, where the laser light source and the focus servo control of the optical pickup 5 are turned on, and the optical pickup 5 is moved up and down to perform a focus search. Thereafter, the process proceeds to step 109, where the spindle motor 3 is driven to rotate the disk 1. At this time, the spindle servo control is in a rough servo state.

Next, in step 110, tracking balance adjustment is performed. That is, when the optical pickup 5 crosses a track due to eccentricity due to a disk and disk chucking, the tracking servo circuit 1
2 from the A / D converter 12d.
Read E. Then, the gains of the variable gain amplifiers 12a and 12b are adjusted so that the upper peak level and the lower peak level of the tracking error signal TE match.

Next, in step 111, the tracking servo control and the spindle servo control are turned on. Next, the routine proceeds to step 112, where T
Check whether the OC read has been completed. If the TOC has been read (YES), the process proceeds to step 118, and if NO, the process proceeds to step 113.

In step 113, the optical pickup 5 is moved to a predetermined position in the lead-in area on the inner peripheral side of the disk 1 to perform a TOC search. Then, step 11
At 4, the TOC read is started and the second automatic adjustment (focus balance adjustment, focus gain adjustment, and tracking gain adjustment) is started. That is, while reading the TOC information from the disk 1, a flow shown in FIG.

In step 115, the process waits until the TOC read is completed.
Move to 6. Then, in step 116, it is determined whether or not the second automatic adjustment has been completed. If the second automatic adjustment has not been completed, the flow shifts to step 117 to output a temporary stop instruction for the second automatic adjustment.
Move to If the second automatic adjustment has already been completed in step 115, the process directly proceeds to step 118.

FIG. 10 is a flowchart of a second automatic adjustment performed in parallel with the TOC read. Step 1
At 51, first, the system controller 19
M20 is searched to determine whether focus balance has been adjusted. If the focus balance has been adjusted, the process proceeds to step 156; otherwise, the process proceeds to step 152.
The process shifts to a loop of 154 to adjust the focus balance. The focus balance is obtained by inputting a predetermined signal from the variable frequency oscillator 10i of the focus servo circuit 10 shown in FIG. 3 to the adder 10j and adjusting the gains of the variable gain amplifiers 10a and 10b based on the output of the A / D converter 10d. It is done by doing. When the adjustment of the focus balance is completed, the oscillation of the variable oscillator 10i is stopped.

In the loop of steps 152 to 154, it is checked in step 153 whether or not the focus balance adjustment has been completed. If the adjustment has not been completed, the process proceeds to step 154, and a second automatic adjustment suspension instruction is issued. Whether or not it has been output (whether or not it has reached step 108)
Find out. If the pause command has been output, the second automatic adjustment is temporarily stopped. If the pause command has not been output, the process returns to step 152 to continue the focus balance adjustment.

When the adjustment of the focus balance is completed in step 153, the process proceeds to step 155,
The data indicating that the focus balance has been adjusted is stored in the RAM 20.
Write it in Thereafter, the process proceeds to step 156. In step 156, the RAM 20 is searched to determine whether the focus gain has been adjusted. And
If the focus gain has been adjusted, the process proceeds to step 161. If the focus gain has not been adjusted, the process proceeds to a loop of steps 157 to 159 to adjust the focus gain. That is, a predetermined signal is input to the adder 10j from the variable frequency oscillator 10i shown in FIG.
The output of 0g is read, and the gain of the variable gain amplifier 10g is adjusted so that the ratio between the input signal and the output of the variable gain amplifier 10g becomes a predetermined value. After the adjustment of the focus gain is completed, the output of the variable frequency oscillator 10i is stopped.

In the loop of steps 157 to 159, it is checked in step 158 whether or not the focus gain adjustment has been completed.
The process proceeds to 59 to check whether or not the second automatic adjustment temporary stop command has been output (whether or not the process has reached step 108). If the pause command has been output, the second automatic adjustment is temporarily stopped. If the pause command has not been output, the process returns to step 157 to continue the focus gain adjustment.

If the adjustment of the focus gain has been completed in step 158, the process proceeds to step 160, and data indicating that the focus gain has been adjusted is recorded in the RAM 20. Thereafter, the process proceeds to step 161. In step 161, the RAM 20 is searched to determine whether the tracking gain has been adjusted. If the tracking gain has been adjusted, the process proceeds to step 166,
If the adjustment has not been completed, the process proceeds to the loop of steps 162 to 164 to adjust the tracking gain. That is,
A predetermined signal is injected into the adder 12j from the variable frequency oscillator 12i of the tracking servo circuit 12 shown in FIG. 4, the output of the variable gain amplifier 12g at that time is examined, and the level of the injected signal and the output of the variable gain amplifier 12g is checked. The gain of the variable gain amplifier 12g is adjusted so that the ratio becomes a predetermined value. After the adjustment is completed, the oscillation of the variable frequency oscillator 12j is stopped.

In the loop of steps 162 to 164, it is checked in step 163 whether or not the adjustment of the tracking gain has been completed. If the adjustment has not been completed, the process proceeds to step 164, and a temporary stop instruction for the second automatic adjustment is issued. Whether or not it has been output (whether or not it has reached step 108)
Find out. If the pause command has been output, the second automatic adjustment is temporarily stopped. If the pause command has not been output, the process returns to step 162 to continue the tracking gain adjustment.

If the adjustment of the tracking gain has been completed in step 163, the process proceeds to step 165, and data indicating that the tracking gain has been adjusted is recorded in the RAM 20. Thereafter, the process proceeds to step 166, where the second
The automatic adjustment of is ended. In step 118 of FIG. 8, a target search is performed. For example, the system controller 19 moves the optical pickup 5 to the start position (the program area of the first song) indicated by the TOC information. Thereafter, the process proceeds to a loop of steps 119 to 122, where data is read from the disk 1 to reproduce the song. Step 1
At 20, it is checked whether or not there is a state transition input. The state transition indicates that the next target is searched, for example, according to a user instruction or the like. If there is no state transition input, the process proceeds to step 121 to check whether the second automatic adjustment has been completed. If the second automatic adjustment has been completed (YES), the process returns to step 119. On the other hand, if the second automatic adjustment has not been completed in step 121, the process proceeds to step 122 to continue the second automatic adjustment, and returns to step 119.

If there is a state transition input in step 120 (in the case of YES), the process proceeds to step 123,
It is determined whether or not the second automatic adjustment has been completed. If the second automatic adjustment has not been completed, the process proceeds to step 124, where the second automatic adjustment is temporarily stopped.
Proceed to. If the second automatic adjustment has been completed, the process directly proceeds to step 125.

In step 125, the optical pickup 5 is moved to the next target, and the process returns to step 119,
Perform playback (data read). In the present embodiment, the TOC read and the second automatic adjustment are performed in parallel in this manner, and if the second automatic adjustment is not completed even after the TOC read is completed, the second automatic adjustment is temporarily performed. Then, after the optical pickup 5 is moved to the target position, the second automatic adjustment is restarted in parallel with the data reproduction.

FIG. 11 is a timing chart when the time required for the second automatic adjustment is shorter than the time required for the TOC read. As shown in FIG.
When a relatively long time is required for the C lead, all the second automatic adjustments are completed between the TOC leads, and after the TOC lead is completed, the optical pickup 5 is moved, and reproduction can be started in a good state.

FIG. 12 is a timing chart in the case where the time required for the second automatic adjustment is longer than the time required for the TOC read. As shown in FIG.
When the time required for the C-read is short, the reproduction of the music is started before the end of the second automatic adjustment, and the remaining second automatic adjustment is performed during the reproduction. Therefore, the playability is slightly degraded at the beginning of the song, but a few seconds after the song starts playing, the second
Since the automatic adjustment of is completed, the performance can be continued with good playability thereafter.

As described above, in the present embodiment, the second automatic adjustment (focus balance adjustment, focus gain adjustment and tracking gain adjustment) is performed in parallel with the TOC read, so that the power is turned on or the disc is loaded. The time until the reproduction actually starts can be remarkably reduced as compared with the related art. For example, while the conventional method requires a time of about 2 to 3 seconds from the loading of the disc to the actual start of reproduction, the present embodiment can reduce the time to about 1 second.

(Second Embodiment) FIG. 13 is a flowchart showing a digital servo automatic adjustment method according to a second embodiment of the present invention. The embodiment will be described with reference to FIG. First, in step 170, C
When the power of the D player is turned on, the process proceeds to step 171, and the system controller 19 checks the chucking state of the disc 1. If the disk 1 is already chucked (YES), the process proceeds to step 175, where the system controller 19 gives the servo controller 16 initial values, and the servo controller 16 sends the servo circuits 4, 7, 10, 12 Is set to the initial state. Then, as in the first embodiment, step 1 in FIG.
The processing after 06 is executed.

On the other hand, if NO in step 171, the flow shifts to step 172 to check the disk insertion state and waits for the disk 1 to be inserted. When the disc is inserted in step 172, the process proceeds to step 173. In step 173, in parallel with the loading of the disk 1, the system controller 19 gives an initial value to the servo controller 16, and the servo controller 16 sets the servo circuits 4, 7, 10, and 12 to an initial state. Thereafter, the flow shifts to step 174, and waits for the disk 1 to be chucked. Then, when the chucking of the disk 1 is completed, the processing after step 106 in FIG. 7 is executed as in the first embodiment.

In this embodiment, since the initialization of each servo circuit is executed in parallel with the loading of the disk, the reproduction is actually started from the power-on or the loading of the disk, as compared with the first embodiment. The time required to do so is further reduced. In each of the first and second embodiments, the method of automatically adjusting the digital servo of the CD player has been described. However, the present invention is not limited to the digital servo adjustment of the CD player. , MD players, CD-ROM players and DVD players.

[0054]

As described above, according to the present invention,
Since the adjustment of the pickup servo and the reading of the disk information are performed in parallel, the time from when the power is turned on or when the disk is loaded to when the data reading is actually started is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a CD player for implementing a digital servo automatic adjustment method according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of the RF amplifier.

FIG. 3 is a block diagram showing a configuration of the focus servo circuit.

FIG. 4 is a block diagram showing a configuration of the tracking servo circuit.

FIG. 5 is a diagram showing a timing chart when the TOC lead and the second automatic adjustment are simply processed in parallel, and the time required for the TOC read is longer than the time required for the second automatic adjustment.

FIG. 6 is a diagram showing a timing chart when the TOC lead and the second automatic adjustment are simply processed in parallel, and the time required for the TOC read is shorter than the time required for the second automatic adjustment.

FIG. 7 is a flowchart (part 1) illustrating a digital servo automatic adjustment method according to the first embodiment;

FIG. 8 is a flowchart (part 2) illustrating the digital servo automatic adjustment method according to the first embodiment;

FIG. 9 is a flowchart (part 3) illustrating the digital servo automatic adjustment method according to the first embodiment;

FIG. 10 is a flowchart (part 4) illustrating the digital servo automatic adjustment method according to the first embodiment;

FIG. 11 is a diagram showing a timing chart in the case where the time required for the second automatic adjustment is shorter than the time required for the TOC read in the first embodiment.

FIG. 12 is a diagram showing a timing chart in the case where the time required for the second automatic adjustment is longer than the time required for the TOC read in the first embodiment.

FIG. 13 is a flowchart illustrating a digital servo automatic adjustment method according to the second embodiment of the present invention.

FIG. 14 is a flowchart showing a conventional digital servo adjustment method for a CD player.

[Explanation of symbols]

 Reference Signs List 1 disc 2 turntable 3 spindle motor 4 spindle servo circuit 5 optical pickup 6 thread motor 7 thread servo 8 RF amplifier 9 digital signal processing circuit 10 focus servo circuit 11, 13 servo driver 12 tracking servo 14 detection circuit 15 A / D converter 16 Servo controller 19 System controller 20 RAM

Claims (4)

[Claims] 1. A process of reading disk information of a loaded disk and adjusting a digital servo of an optical pickup are performed in parallel, and after the reading of the disk information is completed, the adjustment of the digital servo of the optical pickup is completed. If not, stop the adjustment of the digital servo, then move the optical pickup to the target position, and then read data from the disk,
A digital servo adjustment method for a disk drive, wherein the digital servo adjustment of the optical pickup is continued. 2. After the disc is loaded, the digital servo is turned off and at least focus offset adjustment and tracking offset adjustment are executed. After the focus offset adjustment and tracking offset adjustment are completed, the digital servo is turned on. Executing a focus balance adjustment, a focus gain adjustment and a tracking gain adjustment in parallel with the reading of the disc information from the disc, and when the reading of the disc information is completed, the focus balance adjustment, the focus gain adjustment and the If the tracking gain adjustment has not been completed, the adjustment is stopped and the optical pickup is moved to the target position of the disk. Thereafter, in parallel with the reading of data from the disk, the focusing is performed. Lance adjustment, the focus gain information and the digital servo adjustment method for a disk apparatus characterized by continuing the tracking gain adjustment. 3. The method according to claim 1, wherein the disk is a compact disk, and the disk information is TOC information. 4. The method according to claim 1, wherein the loading of the disk and the initialization of the digital servo are simultaneously performed.