JP2002032954A - Spindle servo device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spindle servo device which can return the rotating operation of a spindle motor to normal rotating operation immediately even if the spindle motor runs away. SOLUTION: This device is provided with 1st spindle control signal generating means (10, 8a, 9) which generate spindle control signals from information of a magnetooptic area, 2nd spindle control signal generating means (8b, 9) which generate spindle control signals from information of a pit area, and 3rd spindle control signal generating means (11a, 11b, 9) which generate spindle motor signals according to the signal from a rotational frequency detecting means 21 and the spindle servo control is performed by selecting the spindle control signals from the 1st, 2nd, and 3rd spindle control signal generating means. In case of a runaway, the spindle control signals from the 3rd spindle control generating means are selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle servo device provided in a recording device and a reproducing device for a disk-shaped recording medium such as an optical disk and a magneto-optical disk.

[0002]

2. Description of the Related Art In a recording apparatus and a reproducing apparatus for a disk such as an optical disk and a magneto-optical disk, reproduction by an optical head and recording by a magneto-optical head are performed while rotating the disk by a spindle motor. Here, the drive of the spindle motor is controlled to be CLV (constant linear velocity) or CAV (constant angular velocity) by a drive signal from a spindle servo circuit.

FIG. 8 shows a conventional spindle servo system mounted on a disk recording device and a reproducing device. Reference numeral 30 denotes an optical disk or a magneto-optical disk, which is driven to rotate by a spindle motor 31. 32
Reference numeral denotes an optical head, which irradiates the disk 30 with laser light from a laser diode LD, detects the reflected light with a detector PD, and reads out information recorded on the disk 30.

When the disk 30 is a magneto-optical disk on which a user can record music, for example, as shown in FIG. 9, the innermost side of the disk is a pit area 30a (read-only ROM area). And TOC information for managing the recorded data. Then, an MO (magneto-optical) area 30b is provided, and the MO area 30b is adapted to record management information (U-TOC) for rewriting and general data such as music.

[0005] A wobbling groove is formed in the MO area 30b, and the groove is wobbled (meandered) by a signal whose address information is FM-modulated, for example. As a result, address information (absolute position information) can be extracted from reflected light information based on the wobbling groove even in an area where no data is recorded. At the time of data recording, since there is no address as data, the recording operation is controlled by the address information obtained from the wobbling groove.

The pit area 30a and the MO area 30b are not compatible with respect to the data reading method. Therefore, when reading data from each area, the system controller (not shown) scans the area scanned by the optical head 32. Is controlled so as to switch the readout mode according to.

When the general data is read by the optical head 32, that is, when the data is read from the MO area 30b, the data detected by the detector PD is supplied to the RF amplifier 33, and the arithmetic processing and the amplification processing are performed. Done. In the RF amplifier 33, the detector PD (4
Split detector, a pair of side spot detectors,
And a pair of RF signal detectors) to generate and output reproduction data, a focus servo signal, a tracking servo signal, and the like, but a description of these signals and a circuit system corresponding thereto is omitted.

As a signal for the operation of the spindle servo system, a push-pull signal which is extracted as address modulation information (groove information) from information from, for example, a four-divided detector in the operational amplifier 33a of the RF amplifier 33 is used. The address decoder 34 is a circuit section for demodulating information from the above-described wobbling groove and extracting address information. A signal for spindle servo is extracted by the address decoder 34. For example, the address decoder 34 binarizes the groove information after passing through a band-pass filter having a predetermined center frequency, and extracts bi-phase data by PLL demodulation. Further, a clock of a predetermined frequency is reproduced from the bi-phase data by PLL processing, and this bit clock is used as spindle rotational speed information.

The spindle servo signal extracted from the address decoder 34 is supplied to a signal processing unit 35 (digital signal processor), and the signal processing unit 35
The servo circuit 36 for spindle servo operation to generate and output a spindle error signal ES _AD needed to control the rotation speed of the spindle motor 31.

Further, the optical head 32 has a pit area 33a.
Is operated, the RF signal (EFM signal) obtained by the operational amplifier 33b of the RF amplifier 33 is supplied to the signal processing unit 35, and the signal processing unit 35 converts the reproduced bit clock into the spindle error signal ES. _EFM is generated and output. For example, a synchronization signal is extracted from the EFM signal as reproduction data and injected into a PLL circuit to obtain a reproduction bit clock, which is compared with a reference system clock to generate a spindle error signal ES _EFM .

The servo circuit 36 compares the level of the input spindle error signal ES _AD or ES _EFM with a predetermined reference value to determine whether the current rotation of the spindle motor 31 is faster or slower than a specified speed. Determine. If the rotation speed is not the specified rotation speed, a motor control signal SPO for correcting the rotation speed is generated and supplied to the motor driver 37.

The spindle motor 31 is a motor driver 3
Depending on the direction (positive or negative) of the current applied from 7, the motor is accelerated or decelerated in the positive rotation state, and the specified rotation speed is maintained. That is, when the rotation speed is low, a current in the forward rotation direction is applied for acceleration based on the motor control signal SPO, and when the rotation speed is high, the current is decelerated based on the motor control signal SPO. A current in the reverse rotation direction is applied.

[0013]

In a recording apparatus and a reproducing apparatus having such a conventional spindle servo device, the spindle motor 31 may be in a servo runaway state in which the spindle motor 31 rotates at high speed or reversely. There was a problem.

For example, when reading data in the MO area 30b of the disk 30, a disturbance such as shock or vibration is given to the apparatus, or a large error occurs in the read data for some reason, causing an optical error. It is assumed that the laser scanning by the head 32 has entered the pit area 30a.

As described above, the spindle servo method is different between the pit area 30a and the MO area 30b. For example, if the pit area 30a enters the pit area 30a in the read mode of the MO area 30b, the signal supplied to the signal processing unit 35 It becomes a completely random signal. Therefore, the signals subsequent to the spindle error signal ES also do not function as, for example, the CLV control signal, and the spindle servo loop may function and start reverse rotation in a state where such a random signal is applied. That is, the current in the reverse rotation direction, which is the deceleration current, is continuously applied, and a reverse rotation state occurs. Alternatively, the speed may be extremely high even in the normal rotation direction. In such a servo runaway state, the runaway state cannot be calmed down by the servo control, and the normal operation cannot be restored.

In particular, once reverse rotation has been started, even if the optical head 32 can return to the MO area 30b, since the data to be read is of course not normal data, the servo information can be accurately read. Could not be extracted,
It cannot be returned to the proper rotation state by the spindle servo. In other words, it is not possible to escape from the reverse rotation operation, and the recording / reproduction operation becomes impossible. The same applies to the case where the optical head 32 enters the MO area 30b from the pit area 30a due to disturbance or the like.

From the state in which the spindle servo has stopped functioning, it is conceivable that, for example, the motor power is turned off to wait for the spindle motor 31 to stop, and then the spindle runaway state is temporarily eliminated. Of course, this does not make it possible to quickly return to normal operation.

In addition, a problem occurs not only in the case of movement in the MO area and the pit area as described above, but also in the case of, for example, access in the same area. Problems have occurred even with playback devices.) That is, while the optical head 32 is in the access movement, both the tracking servo and the thread servo must be turned off. Therefore, the above-mentioned signal for generating the spindle error signal ES cannot be read. For this reason, it is very difficult to maintain the rotation speed of the spindle motor within the range in which the spindle servo can be pulled in.

Also, when the optical head 32 is at the innermost position or the outermost position of the disk and performs a reading operation on a so-called mirror surface, the signal for generating the spindle error signal ES is read. Can not
Spindle servo cannot be applied properly.

[0020]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and effectively prevents a spindle motor from running out of control. It is an object of the present invention to provide a spindle servo device that can immediately return to a normal rotation operation even if a runaway state occurs.

Therefore, the spindle servo device according to the present invention comprises a data reading means capable of reading information of a magneto-optical recording area and information of a pit recording area on a disk-shaped recording medium, and a disk-shaped recording medium having a magneto-optical recording area. A first spindle control signal generating means for generating a spindle control signal based on predetermined data read from the magneto-optical recording area by the data reading means; and a pit recording area of a disk-shaped recording medium having a pit recording area. A second step of generating a spindle control signal based on predetermined data read by the data reading means;
A spindle control signal generating means, a spindle motor rotation number detecting means, a third spindle control signal generating means capable of generating a spindle motor control signal based on a signal from the rotation number detecting means, Selecting means for selecting a spindle control signal from the first, second, and third spindle control signal generating means; and rotating the disk-shaped recording medium by using the spindle control signal selected by the selecting means for spindle servo control. Rotation control means capable of controlling the rotation of the spindle motor, detection means for detecting a runaway state of the spindle motor,
If the area from which the data reading unit reads data from the recording medium on the disk is the pit recording area, the selection unit selects the spindle control signal from the first spindle control signal generation unit. When the area from which the reading unit performs reading is the magneto-optical recording area, the selection unit selects the spindle control signal from the second spindle control signal generation unit, and the runaway state is detected by the detection unit. In this case, the selection means includes selection control means for selecting the spindle control signal from the third spindle control signal generation means.

The selection control means may select the spindle control signal from the third spindle control signal generation means after the selection means selects the spindle control signal from the third spindle control signal generation means. The selection means selects the spindle control signal, which is not selected before the runaway state, from among the spindle control signals from the first and second spindle control signal generation means.

Further, the spindle servo device of the present invention comprises a data reading means capable of reading information of a magneto-optical recording area and information of a pit recording area on a disk-shaped recording medium, and a disk-shaped recording medium having a magneto-optical recording area. First spindle control signal generating means for generating a spindle control signal based on predetermined data read from the magneto-optical recording area by the data reading means; and a pit recording area of a disk-shaped recording medium having a pit recording area. Second spindle control signal generation means for generating a spindle control signal based on predetermined data read by the data reading means, rotation speed detection means for the spindle motor, and a spindle motor based on a signal from the rotation speed detection means. Third that can generate a motor control signal
A spindle control signal generating means, a selecting means for selecting a spindle control signal from the first, second, and third spindle control signal generating means, and a spindle control signal selected by the selecting means for spindle servo control. A rotation control means capable of controlling the rotation of a spindle motor for rotationally driving a disk-shaped recording medium by using the data read means; and determining whether an access movement distance is equal to or greater than a predetermined distance when accessing a read position by the data read means. A discriminating means for discriminating; and a spindle control signal from the first spindle control signal generating means to the selecting means when an area from which the data reading means reads the recording medium on the disk is the pit recording area. And if the area from which the data reading means performs reading is the magneto-optical recording area, the selecting means Causes selected spindle control signal from said second spindle control signal generating means,
When it is determined by the determining means that an access of a predetermined value or more is performed, the selecting means is caused to select the spindle control signal from the third spindle control signal generating means. And a selection control means for selecting a spindle control signal from the first or second spindle control signal generation means accordingly.

For example, by providing a third spindle control signal generating means for obtaining a spindle servo control signal based on information from a rotation speed detecting means of a spindle motor using FG, a predetermined spindle control signal from a disk-shaped recording medium is provided. Even in the case where a runaway state occurs due to the inability to reproduce data, the third spindle control signal generating means can be operated to operate the spindle servo.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spindle servo device according to the present invention will be described below with reference to FIGS. This embodiment will be described as a spindle servo device mounted on a recording / reproducing device corresponding to a magneto-optical disk and an optical disk. FIG. 2 is a block diagram showing a main part of the recording / reproducing apparatus.

In FIG. 2, reference numeral 1 denotes a magneto-optical disk or an optical disk, and the disk 1 is driven to rotate by a spindle motor 2. Reference numeral 3 denotes an optical head for irradiating a laser beam to the disk 1 at the time of recording / reproduction, and a high-level laser output for heating a recording track to the Curie temperature at the time of recording at the magneto-optical disk, and at the time of reproduction. A relatively low level laser output for detecting data from the reflected light is provided by the magnetic Kerr effect.

The disc 1 is a read-only premastered disc (optical disc) composed entirely of pit information, and a recordable / reproducible disc in which TOC information is formed in pits and music and user TOC are magneto-optically recorded. (Magneto-optical disk), and as the magneto-optical disk, there is a hybrid disk in which a pit track and a magneto-optical track are also formed as audio data tracks of music or the like.

In the case of an optical disk in which data is recorded in the form of pits like a CD, the optical head 3 reproduces not the magnetic Kerr effect but the change in the reflected light level due to the presence or absence of pits as in the case of a CD player. This is for extracting an RF signal. Of course, the magnetic field recording operation described later is not performed on the optical disk.

In order to read data from the disk 1 in this manner, the optical head 3 has a laser diode as a laser output unit, an optical system including a polarizing beam splitter and an objective lens, and a detector for detecting reflected light. A detector is mounted. The objective lens 3a is held by a two-axis mechanism 4 so as to be displaceable in a radial direction of the disk and in a direction toward and away from the disk, and the entire optical head 3 is movable in a radial direction of the disk by a sled mechanism 5.

Reference numeral 6 denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, and is disposed at a position facing the optical head 3 with the disk 1 interposed therebetween.

The information detected from the disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 performs an arithmetic operation on the supplied information,
Groove information serving as a reproduction RF signal (EFM signal), tracking error signal, focus error signal, absolute position information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 1), and focus information (FOK signal) ) Etc. are extracted. Then, the extracted reproduced RF signal (EFM signal) is supplied to the encoder / decoder unit 8. Further, the tracking error signal and the focus error signal are supplied to the servo circuit 9.

The servo circuit 9 receives the supplied tracking error signal, focus error signal, track jump command and access command from the system controller 11,
Various servo drive signals are generated by the spindle error signal ES or the like, and the two-axis mechanism 4 and the thread mechanism 5 are controlled to perform focus and tracking control, and the spindle motor 2 is controlled to a constant linear velocity (CLV). In addition,
As will be described later, the spindle error signal ES is supplied through the adder 23.

The reproduced RF signal is supplied to the encoder / decoder 8
Then, decoding processing such as EFM demodulation and CIRC is performed, and is temporarily written into the buffer RAM 13 by the memory controller 12. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduced data from the optical head 3 to the buffer RAM 13 are performed at 1.41 Mbit / sec (intermittently).

The data written in the buffer RAM 13 is read out at a timing when the transfer of the reproduction data becomes 0.3 Mbit / sec, and is supplied to the encoder / decoder section 14. Then, the signal is subjected to reproduction signal processing such as decoding processing for the audio compression processing, converted into an analog signal by the D / A converter 15, supplied from the terminal 16 to a predetermined amplifier circuit section, and reproduced and output. For example, they are output as L and R audio signals.

The data read from the disk 1 is once intermittently written into the buffer RAM 13 at a high rate, and is read out at a low rate and output as audio. Thus, a so-called shock proof function is realized in which the sound output is continued without interruption even if the data cannot be read from the memory.

The absolute position information obtained by decoding the groove information or the address information recorded as data output from the address decoder 10 is supplied to the system controller 11 via the encoder / decoder section 8, and various types of information are provided. Used for control operation. The encoder / decoder section 8 further supplies synchronization signal detection information, a servo monitor signal, and the like to the system controller 11.

When a recording operation is performed on the disk (magneto-optical disk) 1, the recording signal (analog audio signal) supplied to the terminal 17 is converted to an A / D converter 18.
After that, the digital data is supplied to the encoder / decoder section 14 and subjected to audio compression encoding processing. The recording data compressed by the encoder / decoder unit 14 is once written into the buffer RAM 13 by the memory controller 12, read out at a predetermined timing, and sent to the encoder / decoder unit 8. Then, the encoder / decoder unit 8 performs CIRC encoding, E
After being subjected to encoding processing such as FM modulation, it is supplied to the magnetic head drive circuit 15.

The magnetic head drive circuit 15 supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the magnetic head 6 causes the magnetic head 6 to apply an N or S magnetic field. At this time, the system controller 11 supplies a control signal to the optical head 3 so as to output a laser beam at a recording level.

Reference numeral 19 denotes an operation input unit provided with keys for user operation, and reference numeral 20 denotes a display unit constituted by, for example, a liquid crystal display.

Reference numeral 21 denotes a rotation detecting unit, which is constituted by, for example, an FG that generates a frequency corresponding to the spindle rotation speed using a back electromotive current obtained from a spindle motor driver. The output FG pulse is supplied to the system controller 11.

In the magneto-optical disc 1, data for managing an area where data such as music and the like and an unrecorded area are recorded are recorded as TOC information. At the time when the disc 1 is loaded, immediately before the recording or reproducing operation, or the like, the system controller 11 drives the spindle motor 2 and the optical head 3 and, for example, the TOC area set on the innermost side of the disc 1 To extract the data. Then, the RF amplifier 7, the encoder /
The TOC information supplied to the memory controller 12 via the decoder unit 8 is stored in a predetermined area of the buffer RAM 13 and is subsequently used for controlling the recording / reproducing operation on the disk 1.

In the recording / reproducing apparatus shown in FIG.
FIG. 1 shows only the components of the spindle servo device according to the present embodiment that are extracted. In the optical head 3, a quadrant detector (A, B, C, D), a detector for side spots (E, F), and a detector for RF are used as a detector PD for detecting the reflected light of the laser beam emitted from the laser diode LD to the disk 1. A detector (I, J) is provided.

In the RF amplifier 7, I + J
Of the reproduction RF signal (EFM as pit information)
Signal) is converted to a reproduction R as MO information by an I-J operation.
An F signal (EFM signal) is obtained, and a tracking error signal is generated by calculating EF. Furthermore, (A +
D)-(B + C) is executed to generate a focus error signal. Also, groove information is extracted by a push-pull signal by the operation of (A + B)-(C + D).

In FIG. 1, an operation amplifier 7a in the RF amplifier 7 obtains groove information by an operation of (A + B)-(C + D) and supplies it to the address decoder 10. The operational amplifier 7b generates a reproduced RF signal (EFM signal) as pit information by performing an I + J operation and supplies the reproduced RF signal (EFM signal) to the encoder / decoder unit 8. The outputs of the operational amplifiers 7a and 7b are used for the spindle servo.

That is, when the optical head 3 is reproducing and scanning the MO area of the magneto-optical disk 1, the address decoder 10 performs not only the address demodulation operation from the groove information but also the digitization of the groove information and then the PLL demodulation. The bi-phase data is extracted, and a clock of a predetermined frequency is reproduced from the bi-phase data by PLL processing, and this bit clock is used as spindle rotational speed information.

The spindle servo signal extracted from the address decoder 34 is supplied to a spindle error data generating section 8a in the encoder / echo section 8, and the spindle error signal ES _AD (the servo circuit 9 determines the number of rotations of the spindle motor 2) , A servo control signal necessary for controlling the control signal is generated.

Further, when the optical head 32 is
During the reproduction scanning of the optical disk 1 or the pit area of the optical disk 1, the RF signal (EFM signal) obtained by the operational amplifier 7b in the RF amplifier 7 receives
Is supplied to the spindle error data generator 8b. The spindle error data generating section 8b extracts a synchronization signal from the EFM signal, injects it into the PLL circuit to obtain a reproduced bit clock, compares this with the reference system clock, and compares the spindle clock with the reference system clock (the servo circuit 9 _{controls the} spindle motor 2 (A servo control signal required to control the rotation speed of the motor).

The spindle error signal ES _AD is supplied to the T ₁ terminal of the output switching unit 8c, also the spindle error signal ES _EFM is supplied to the T ₂ terminal. Output switching unit 8c
Is supplied to the servo circuit 9 via the adder 23. The switching control is usually the system controller 11 of the output switching section 8c, MO information T ₁ terminal at the time of reproduction, but the pit information reproduction is controlled to T ₂ terminal, the system controller 11 in response to the control program to be described later Execute switching control.

The servo circuit 9 on the basis of the spindle error signal ES _AD or ES _EFM is input, to determine rotation of the current spindle motor 31 is early or late than the predetermined number of rotations, the rotation speed is defined The motor control signal SPO is generated so as to be a number and is supplied to the motor driver 22.

The spindle motor 2 is a motor driver 22
Is accelerated or decelerated in the positive rotation state depending on the direction (positive / negative) of the current applied from, and the specified rotation speed is maintained. That is, when the rotation speed is low, a current in the forward rotation direction is applied for acceleration based on the motor control signal SPO, and when the rotation speed is high, the current is decelerated based on the motor control signal SPO. A current in the reverse rotation direction is applied.

The FG pulse from the rotation detecting section 21 is supplied to an FG input section 11a of the system controller 11, and the frequency of the FG pulse is used to detect the spindle rotational speed. The information is supplied to the spindle error data generator 8c. The spindle error data generator 8c performs a spindle error signal ES _FG for accelerating or decelerating the spindle motor 2 at least in a rough servo state (within a servo pull-in range) according to the spindle speed information.
Generate This spindle error signal ES _FG adder 2
The spindle motor 2 is supplied to the servo circuit 9 through the servo circuit 3 and rough servo control is performed on the spindle motor 2 in this case. Incidentally, the output switching section 8c at this time will be switched to T ₃ terminal.

That is, in the spindle servo device of the present embodiment, the spindle error signals ES _AD and ES _EFM are switched between when reproducing the MO information and when the pit information is reproduced.
_Switch to use _FG . Hereinafter, the case where the spindle servo is switched to the one by the spindle error signal ES _FG will be described with reference to the flowcharts of FIGS. 3 to 5 showing the processing of the system controller 11, and the servo operation using the spindle error signal ES _FG will be described. This will be described with reference to the flowchart of FIG.

As described above, the spindle servo is normally executed by using the spindle error signal ES _AD or ES _EFM . First, in this embodiment, the scanning by the optical head 3 is performed between the areas for some reason. When it moves, the servo is switched to the servo based on the FG pulse.

First, it is assumed that the optical head 3 enters the MO area due to disturbance or the like while scanning the pit area with respect to the magneto-optical disk 1. FIG. 3 shows processing of the system controller 11 in such a case.
First, when the pit area is scanned with respect to the magneto-optical disk 1 (F100), it is monitored whether a synchronization signal is properly extracted from the EFM signal (F101). If the synchronization signal cannot be detected normally for a certain period of time,
It is determined that the optical head 3 has entered the MO area due to disturbance or the like (F101 → NO). Then, first, the FG pulse from the rotation speed detector 21 is taken in to detect the spindle rotation speed, and it is determined whether or not the spindle rotation speed is at least within the rough servo range (F102).

[0055] If in the rough servo range, if as servo in accordance with the MO area, that is, the output switching section 8c using a spindle error signal ES _AD is switched to the T ₁ terminal servo is executed (F 114), In the moved MO area, the spindle servo is properly executed, the operation can be performed normally, and required processing can be performed. For example, it is possible to take measures such as returning to the pit area.

However, when the spindle rotation state is out of the rough servo range in step F102, it can be determined that the spindle is running out or in danger of runaway. Therefore, switching the output switching section 8c to T ₃ terminal, also in the spindle error data generator 11b, to execute the output of the spindle error signal ES _FG (F103).

By executing the spindle servo based on the FG pulse in this way, it is possible to stabilize to a rough servo state even if a runaway state occurs as described later. Therefore, continued servo by the spindle error signal ES _FG, switched to the servo using the spindle error signal ES _AD corresponding to the MO area when it enters the rough servo range (F 104).

Next, it is assumed that the optical head 3 enters the pit area due to disturbance or the like while scanning the magneto-optical disk 1 in the MO area. FIG. 4 shows processing of the system controller 11 in such a case.
First, while scanning the MO area on the magneto-optical disk 1 (F200), for example, it is monitored whether or not the spindle control is normally performed by a servo monitor signal (F201). Then, it is determined that the optical head 3 has entered the pit area due to disturbance or the like (F201 → N
O). In this case, first, the FG pulse from the rotation speed detecting unit 21 is taken in to detect the spindle rotation speed, and it is determined whether or not the spindle rotation speed is at least within the rough servo range (F20).
2).

[0059] If in the rough servo range, if as servo in accordance with the pit area, that is, the output switching section 8c using a spindle error signal ES _EFM is switched to T ₂ terminal servo is executed (F 214), The spindle servo is appropriately executed in the moved pit area, the operation can be performed in a normal state, and necessary processing can be performed. For example, it is possible to take measures such as returning to the MO area.

[0060] However, when the spindle rotation state is out of the rough servo range in step F 202, since it determines the state at risk in the spindle runaway or runaway, it switches the output switching section 8c to T ₃ terminal, also spindle error data The output of the spindle error signal ES _FG is executed in the generator 11b (F203). By executing the spindle servo based on the FG pulse in this way, the spindle servo is stabilized until the rough servo state is reached. When the spindle servo enters the rough servo range, the spindle error signal ES corresponding to the pit area is obtained.
_Switch to servo using _EFM (F204).

The system controller 11 executes the spindle servo using the FG pulse even when executing a relatively long-distance track jump (track access). That is, as shown in FIG. 5, when performing track access (F300), it is first determined whether or not the number of jump tracks is 100 or more (F300).
301). If it is within 100 tracks, track access is performed as it is, and after the access is completed, start-up processing is performed, and processing proceeds to the next operation (for example, reproduction operation) (F30).
2, F303, F308). During this time, switching of the spindle servo system is not particularly performed.

[0062] However, relatively during long distance access (consisting spindle servo in a free state according to the spindle error signal ES _AD or ES _EFM when accessing as described above), that you keep the spindle in the rough servo range Not only becomes difficult, but also in some cases, the spindle may be in a stationary state or a high-speed rotating state. For example when accessing at MO area is will cross the grooves, relatively low for the signal obtained as a spindle error signal ES _AD from the reflected light information at this time the CLV control frequency (e.g., 22.05 KHz) Frequency (for example, about 5 KHz). In this case, there is the servo circuit 9 will be the error signal frequency as a spindle error signal ES _AD and the acceleration control to match the CLV control frequency, resulting in a very high speed in some cases.

In order to avoid such a situation, a step
If it is determined that 100 tracks or more access in F301, switches the output switching section 8c to T ₃ terminal, also in the spindle error data generator 11b, to execute the output of the spindle error signal ES _FG (F304). This is returned as rough servo is applied when accessing (F305, F306), the access end to the usual servo system (servo by the spindle error signal ES _AD or spindle error signal ES _EFM) (F307).

As described above, by performing the spindle servo based on the FG pulse at the time of long-distance access, the rough servo state can be easily stabilized during the access,
Spindle runaway and stop are avoided, and since the spindle rough servo state is always obtained, the start-up process after access is speeded up.

It should be noted that, besides the explanation with reference to FIGS. 3 to 5, the spindle servo based on the FG pulse may be switched. For example, if the spindle servo using the spindle error signal ES _FG is performed even in the focus search for controlling the objective lens up to the focus pull-in range, the relative speed between the optical head and the disk surface can be easily kept constant, and the reliability of the focus search can be improved. Performance can be improved.

The spindle servo based on the spindle error signal ES _FG generated based on the FG pulse is executed as described above. This spindle error signal ES _FG is generated and output as shown in FIG.

First, the FG pulse frequency is measured to determine the spindle speed (F100). Then, it is determined whether or not the FG pulse frequency is within the rough servo range (F401). If outside the rough servo range, step F402
If the rotation speed is higher than the rough servo status (F402 → NO),
It is determined whether the motor is rotating at a lower speed than the rough servo status (F402 → NO).

[0068] If the high speed rotation state, and outputs a deceleration kick pulse as a spindle error signal ES _FG (F 406), i.e. the deceleration by applying a deceleration direction of the current to the spindle motor 2 by the servo circuit 9 and the motor driver 22 Let it. On the other hand, if the low speed rotation state, and outputs an acceleration kick pulse as a spindle error signal ES _FG (F403), accelerating by applying an acceleration direction of the current to the spindle motor 2 or the servo circuit 9 and the motor driver 22 .

That is, F400 → F401 → F402 → F406 → F407 → F4
00 loop or F400 → F401 → F402 → F403 → F404 →
By the processing of the loop of F400, it draws in to the rough servo.

In some cases, the spindle motor may run away in the deceleration direction and enter a reverse rotation state. However, the rotation direction cannot be determined only by measuring the FG pulse frequency. So step F40
4, F407 is being processed.

FIG. 7 shows FG pulses corresponding to the spindle rotation speed. Assume that the portion of RS is a rough servo range. For example, when the spindle rotation speed is in the speed state, the process proceeds from step F402 to F406 to output a deceleration kick pulse, and the rough servo range R indicated as the speed is output.
There is no problem because it is controlled toward S, but assuming a case where the speed is the same as the speed and a reverse rotation state is assumed, since the rotation direction is not detected from the frequency, the processing also proceeds from step F402 to step F406 at this time. Then, a deceleration kick pulse is output. That is, control is performed in the direction indicated by the speed, and the reverse rotation runaway state is further promoted.

Further, assuming that the vehicle is in the speed state, the frequency is lower than the rough servo range RS, so that the process proceeds to step F403, in which an acceleration kick pulse is output and the rotation is controlled in the forward rotation direction. After returning, it will be accelerated further to the state of speed, and it will take a very long time to retract the rough servo. To resolve these,
It is checked in step F404 whether the FG pulse frequency has risen and in step F407, whether the FG pulse frequency has fallen.

That is, if there is a certain state in the forward rotation,
If an acceleration kick pulse is output, the FG pulse frequency will always increase, and if a deceleration kick pulse is output, the FG pulse will always increase.
The pulse frequency should be lower. Therefore, when the FG pulse frequency becomes low after outputting the acceleration kick pulse, or when the FG pulse frequency becomes high after outputting the deceleration kick pulse, it can be determined that the spindle motor 2 is in the reverse rotation state. become. Therefore, in this case, the process proceeds to step F405 or step F408,
The acceleration kick pulse is output for a sufficient period for returning to the normal rotation, and the rotation is forcibly returned to the normal rotation.

Note that the output of the acceleration kick pulse in steps F405 and F408 is performed from the reverse rotation state at the maximum speed so that the spindle motor can return to the normal rotation even if the spindle motor is rotating at any speed. However, it is preferable to perform the operation continuously for a sufficient period so that the user can return.
For this reason, in some cases, the number of rotations becomes too fast in the state of returning to the normal rotation, but if the motor is in the normal rotation state, the rotation is controlled within the rough servo range by the operation of the spindle servo loop of FIG. Absent.

As described above, the spindle error signal ES _FG
Is generated, when the optical head 3 cannot read data properly for the spindle servo, for example, when the optical head 3 accidentally moves between the MO area and the pit area, or when accessing or at the time of focus search, etc. In addition, the spindle rough servo control can be performed satisfactorily, and the spindle error signal ES _FG can be controlled as shown in FIGS.
, The spindle runaway can be prevented, or the runaway state can be returned to the normal operation. Further, by stabilizing the operation of the spindle motor, the start-up process after access can be speeded up.

Although the embodiment of the present invention has been described above, the spindle servo device of the present invention is not limited to the above-described embodiment, but can be variously modified. For example, the rotation speed detecting means may not be FG. Further, it is also possible that the rotation direction can be determined by the rotation number detecting means itself. For example, the rotation direction can be detected by checking the phase difference between two FG pulses. Also, in cases other than the cases of FIGS. 3 to 5 and the focus search, when the spindle servo is disabled, the rotation speed detecting means (F
Switching to the spindle servo based on G) may be performed.

[0077]

As described above, the spindle servo device of the present invention generates the first spindle control signal generating means for generating the spindle control signal from the information in the magneto-optical area, and generates the spindle control signal from the information in the pit area. Second
And a third spindle control signal generating means for generating a spindle motor control signal based on a signal from the rotational speed detecting means, wherein the first, second, and third spindle control signal generating means are provided. The spindle control signal can be selected from the disk drive to perform spindle servo control. Therefore, even if predetermined data cannot be reproduced from the disk-shaped recording medium for spindle control, the third spindle control can be performed. The signal generation means can function to operate the spindle servo,
The operation of the spindle motor can be stabilized. Therefore, even if a servo runaway state (high-speed rotation or reverse rotation) occurs for some reason, the third spindle control signal generating means can always return to an appropriate state.

In particular, when the data reading means is controlled so as to execute the operation of reading information from one of the recording areas on a disk-shaped recording medium having both a magneto-optical recording area and a pit recording area. In this case, when the information reading operation of the other recording area is executed, a runaway state may occur. However, the spindle servo control is performed by selecting the spindle control signal from the third spindle control signal generating means. By executing, it is possible to return from the runaway state to the normal operation.

When an access operation for a predetermined distance or more is executed, the spindle control signal from the third spindle control signal generating means is selected and spindle servo control is executed, thereby stabilizing the access operation and achieving access. In this way, it is possible to prevent runaway of the spindle at the time, and to speed up the startup process after the access.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a spindle servo device according to the present invention.

FIG. 2 is a block diagram of a main part of a recording / reproducing apparatus on which the spindle servo device according to the embodiment is mounted.

FIG. 3 is a flowchart of a spindle servo switching operation in the embodiment.

FIG. 4 is a flowchart of a spindle servo switching operation according to the embodiment.

FIG. 5 is a flowchart of a spindle servo switching operation in the embodiment.

FIG. 6 is a flowchart of a spindle servo operation based on an FG pulse in the embodiment.

FIG. 7 is an explanatory diagram of a rotation direction detecting operation at the time of a spindle servo operation based on an FG pulse according to the embodiment;

FIG. 8 is a block diagram of a conventional spindle servo device.

FIG. 9 is an explanatory diagram of a region of a magneto-optical disk.

[Explanation of symbols]

1 disk, 2 spindle motor, 3 optical head, 7 RF amplifier, 8 encoder / decoder, 8
a, 8b, 11b spindle error data generator, 9
Servo circuit, 10 address decoder, 11 system controller, 11a FG input unit, 21 rotation speed detection unit, 22 motor driver, 23 adder

Claims (3)

[Claims] 1. A data reading means capable of reading information of a magneto-optical recording area and information of a pit recording area on a disk-shaped recording medium, and said data is read from a magneto-optical recording area of the disk-shaped recording medium having a magneto-optical recording area. First spindle control signal generating means for generating a spindle control signal based on predetermined data read by the reading means; and data read by the data reading means from a pit recording area of a disk-shaped recording medium having a pit recording area. Second spindle control signal generation means for generating a spindle control signal based on predetermined data; rotation speed detection means of a spindle motor; and generation of a spindle motor control signal based on a signal from the rotation speed detection means. A third spindle control signal generating means capable of performing Selecting means for selecting a spindle control signal from the spindle control signal generating means of No. 3, and controlling the rotation of a spindle motor for rotating and driving the disk-shaped recording medium by using the spindle control signal selected by the selecting means for spindle servo control. Rotation control means capable of performing the operation, detection means for detecting a runaway state of the spindle motor, and selection when the area from which the data reading means reads the recording medium on the disk is the pit recording area. Means for selecting a spindle control signal from the first spindle control signal generating means. If the area from which the data reading means performs reading is the magneto-optical recording area, the selecting means causes the selecting means to select the second spindle control signal. The spindle control signal from the generating means is selected, and the runaway state is detected by the detecting means. If but is detected, the spindle servo system, characterized in that said configured with a, a selection control means for selecting a spindle control signal from said third spindle control signal generating means to the selection means. 2. The method according to claim 1, wherein the selection control means selects the spindle control signal from the third spindle control signal generation means, and, if the end of the runaway state is detected by the detection means, Among the spindle control signals from the first and second spindle control signal generating means,
2. The spindle servo device according to claim 1, wherein the selection means selects a spindle control signal that has not been selected before the runaway state. 3. A data reading means capable of reading information of a magneto-optical recording area and information of a pit recording area in a disk-shaped recording medium, and said data reading means from a magneto-optical recording area of the disk-shaped recording medium having a magneto-optical recording area. First spindle control signal generating means for generating a spindle control signal based on predetermined data read by the reading means; and data read by the data reading means from a pit recording area of a disk-shaped recording medium having a pit recording area. Second spindle control signal generation means for generating a spindle control signal based on predetermined data; rotation speed detection means of a spindle motor; and generation of a spindle motor control signal based on a signal from the rotation speed detection means. A third spindle control signal generating means capable of performing Selecting means for selecting a spindle control signal from the spindle control signal generating means of No. 3, and controlling the rotation of a spindle motor for rotating and driving the disk-shaped recording medium by using the spindle control signal selected by the selecting means for spindle servo control. Rotation control means capable of performing the data reading; determining means for determining whether an access movement distance is equal to or greater than a predetermined value when accessing a read position by the data reading means; If the area from which the reading means performs reading is the pit recording area, the selecting means selects the spindle control signal from the first spindle control signal generating means, and the area from which the data reading means performs reading is the optical signal. In the case of a magnetic recording area, the selection means is provided with a signal from the second spindle control signal generation means. And selecting the spindle control signal from the third spindle control signal generating means when the discriminating means determines that the access is performed more than a predetermined amount. After the end, a selection control means for selecting the spindle control signal from the first or second spindle control signal generation means in accordance with the accessed area, a spindle servo device comprising: .