JP2001222816A - Optical recording and reproducing device and optical recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device and optical recording and reproducing method capable of optimizing reset processing according to the kinds of asynchronous errors. SOLUTION: The optical recording and reproducing device has a CPU which controls the recording or reproducing of information in accordance with the data of the reflected light of a laser beam from an optical block 3 and a DSP 9, which makes the error identification relating to the laser beam by detecting the data relating to the laser beam, supplies an identification code to the CPU and transmits an error message to the CPU without erasing the identification code when detecting the identification code for identifying the error, and therefore when the abnormality of, for example, a laser system, which is the most significant error among the asynchronous errors occurs, the CPU rejects all the subsequent operations, thereby making it possible to provide the protection of the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus and an optical recording / reproducing method, for example, a recordable disc such as a write-once compact disc (CD-R), a magneto-optical disc (MO), and a phase change disc. The present invention can be applied to an optical recording / reproducing apparatus and an optical recording / reproducing method that perform the asynchronous error detection processing described above.

[0002]

2. Description of the Related Art Conventionally, for example, the power required for recording and erasing laser beam data used in an optical recording / reproducing apparatus for an optical information recording medium is the number of laser beam powers used for reproducing. More than double. Therefore, if the power of the laser beam is increased during recording or erasing or higher than that during reproduction due to a malfunction, it may not be possible to maintain the normal recording state of the data recorded on the disc. .

[0003] Regarding such conventional data protection by a change in laser power beam, Japanese Patent Application Laid-Open No. 8-31079 discloses a method.
Japanese Patent Application Laid-Open Publication No. H11-157, discloses a data protection method in which, when a controller recognizes occurrence of an abnormality based on a detection output from a power detection circuit, an alarm notifies the occurrence of the abnormality.

[0004] Conventionally, as an asynchronous system error (hereinafter simply referred to as asynchronous error), a laser spot deviates from a control range in the track direction due to vibration or impact to the optical head from the outside.
King Failure).

[0005] Further, as a similar asynchronous error, there is a focus failure in which the position of the objective lens in the focus direction is out of the control range due to vibration or impact from the outside on the optical head.

[0006] Further, as a similar asynchronous error, there has been a laser warning (Laser Attention) generated when the laser is deteriorated or abnormal light emission occurs.

Although the asynchronous error detection processing described above is separate, the subsequent recovery processing is exactly the same. FIG. 6 shows a conventional asynchronous error processing flow.

In FIG. 6A, a sampling timer interrupt process is performed in step S21. Specifically, the interrupt processing is started every 20 μs, for example. Step S
At 22, it is determined whether the fluctuation of the tracking error signal from the optical block does not exceed the threshold value in the interrupt processing.

If the fluctuation of the tracking error signal exceeds the threshold value in step S22, an error code of the tracking error is set in step S23, and an attention bit is set in step S24.

If the fluctuation of the tracking error signal does not exceed the threshold in step S22, it is determined in step S25 whether the fluctuation of the focus error signal does not exceed the threshold.

If the fluctuation of the focus error signal exceeds the threshold value in step S25, an error code of the focus error is set in step S26, and an attention bit is set in step S24.

When the sampling timer interrupt is in operation, it waits until the sampling timer is finished.
A detection delay of μs occurs.

In FIG. 6B, a laser warning interrupt process is performed in step S31. In particular,
For example, an interrupt process started when an abnormality occurs in the laser power.

At step S32, an attention error code of a laser error is set, and an attention bit is set.

In FIG. 6C, in the main routine processing in step S41, it is determined in step S42 whether any command processing has been completed. Specifically, it is determined whether the seek operation has been completed.

When any command processing is completed in step S42, it is determined in step S43 whether an attention bit is set. If the attention bit is not set in step S43, C is set in step S46.
Transmit end message to PU.

If the attention bit is set in step S43, the attention bit is cleared in step S44, and then an error message is transmitted to the CPU in step S45.

[0018]

The above-mentioned laser system abnormality is different from tracking error and the like in that the normal state of data may not be maintained or the normal state of recording data on the disk may not be maintained. It is a very serious situation that may be. In addition, when the life of the laser has expired beyond its expiration date, there has been a case where the laser becomes unstable as described above with or without laser attention. However, with the conventional data protection method and asynchronous error detection processing described above, if the same processing as normal asynchronous error detection is performed in such a case, the laser will be unstable until the laser reaches its end of life. Recording or reproduction of data must be continued in such a state, and there is an inconvenience that customer data cannot be protected.

Therefore, when such a laser system error occurs, the signal processing of the optical recording / reproducing apparatus is performed.
The SP (Digital Signal Processor) is required to reject any subsequent operations.

The present invention has been made in view of the above points, and is intended to propose an optical recording / reproducing apparatus and an optical recording / reproducing method capable of optimizing a recovery process according to the type of asynchronous error. is there.

[0021]

In order to solve the above problems, an optical recording / reproducing apparatus according to the present invention irradiates a laser beam from an optical pickup onto an optical recording medium, records an information signal, and detects reflected light of the laser beam. In the optical recording / reproducing apparatus for reproducing an information signal by performing the operation, control means for controlling operation of recording or reproducing information based on data of reflected light of laser light from the optical pickup, and detecting data relating to laser light An error identification means for performing error identification on the laser beam and supplying an identification code to the control means, and an error message transmitted to the control means without erasing the identification code when the identification code for identifying an error from the error identification means is detected. And error transmission means for transmitting

Further, the optical recording / reproducing method of the present invention is directed to an optical recording / reproducing method which irradiates a laser beam from an optical pickup onto an optical recording medium to record an information signal, and detects the reflected light of the laser beam to reproduce the information signal. In the reproducing method, an error identification step of identifying an error relating to the laser beam by detecting data relating to the laser beam, and transmitting an error message without erasing the identification code when the identification code identifying the error is detected in the error identification step. An error transmitting step, and a control step of controlling information recording or reproducing operation based on data of reflected light of laser light from the optical pickup in response to the error message.

According to the optical recording / reproducing apparatus of the present invention, the following operations are performed. When an abnormality occurs in the laser power, the interrupt processing is started, and in the control means, when the total light quantity signal of, for example, the magneto-optical disk supplied from the optical block falls below a predetermined threshold value, the error identification means sets off the photodiode. It recognizes that the whole is a fatal abnormal state in which a sufficient amount of light is not obtained.

Then, the error identification means sets a fatal error code indicating a fatal laser error,
Set the fatal error identification bit.

As described above, in the laser warning interrupt processing, the error identification means sets the fatal error identification bit, and sets the error code to a fatal error code instead of a warning code.

Then, in the main routine processing showing the operation for the control means, the error identification means determines whether or not any command processing, for example, a seek operation has been completed.
When any command processing is completed, the error identification means determines whether or not the fatal error identification bit is set. If the fatal error identification bit is not set, the error identification means determines whether the warning bit is set. If the warning bit is not set, the error transmitting means transmits an end message to the control means.

If the fatal error identification bit is set,
The error transmission means transmits a fatal error identification bit error message to the control means. If the warning bit is set, after clearing the warning bit, the error transmitting means transmits an error message of the warning bit to the control means.

As described above, when the fatal error identification bit is set in the main routine, the error transmitting means sends a fatal error code to the control means. The difference between the warning bit and the fatal error identification bit is that the former is cleared in the main routine and has no effect on the next command, while the latter is not cleared in the main routine, so the next command is also cleared. An error always occurs. Therefore, an error occurs even if there is no problem in the execution content of the command itself.
That is, unless the fatal error identification bit dedicated to the laser warning processing is cleared, the error message is continuously sent to the control means.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a magneto-optical drive device to which a magneto-optical disk recording / reproducing device is applied as an example for performing laser abnormality determination according to an embodiment of the present invention.

That is, this optical disk recording / reproducing apparatus
A spindle motor 2 for rotating the magneto-optical disk 1,
A spindle driver 14 for rotationally driving the spindle motor 2; an optical block 3 having a laser diode for emitting a laser beam and an objective lens for forming a light spot on the magneto-optical disk 1; And a slide block 4 that moves in the direction.

The optical disk recording / reproducing apparatus generates various signals based on control data supplied from a central processing unit (CPU (Central Processing Unit)) (not shown) via SCSI (Small Computer System Interface). An optical disc controller (ODC) 6, a read channel 7 for generating read data from a reproduced RF signal, a laser power controller (LPC) 8 for controlling the laser power of a laser diode, and a D for performing various operations.
SP (Digital Signal Processor) 9.

The optical block 3 is not shown, but
As an optical system, a beam splitter that transmits a laser beam emitted from a laser diode and reflects it on one side and reflects return light from the magneto-optical disc 1 on the other side, and condenses the laser beam transmitted by the beam splitter. In addition, an objective lens that transmits the return light from the magneto-optical disk 1 and a polarization beam splitter (analyzer) that polarizes the return light from the magneto-optical disk 1 reflected by the beam splitter and converts the reflected light into light intensity. It is composed.

The optical block 3 is supplied with a monitor diode for receiving one laser beam reflected by the beam splitter and supplying a power monitor signal to the DSP 9 and a command value amplified by a focus driver 10 described later. A focusing coil and a tracking coil to which a command value amplified by a tracking driver 11 to be described later are supplied, which are orthogonally arranged in a common magnetic field, and have a biaxial actuator in which an objective lens is attached to the movable portion. It is composed.

The optical disk recording / reproducing apparatus includes a bias magnet 5 for applying an external magnetic field to the magneto-optical disk 1.
A focus driver 10 for amplifying the command value from the DSP 9, a tracking driver 11 for amplifying the command value from the DSP 9, a slide driver 12 for amplifying the command value from the DSP 9, and a bias for amplifying the command value from the DSP 9 Magnet driver 13 and optical block 3
A linear encoder 15 provided at a fixed portion of the movable range of the spindle motor side (hereinafter referred to as the inner circumference of the magneto-optical disk or simply the inner circumference) to detect the position of the slide block 4 on the inner circumference of the optical block 3. Having.

The optical block 3 receives a return light from the magneto-optical disk 1 reflected by the beam splitter on the other side as a light intensity through a polarization beam splitter, and outputs an RF signal (photodetector and photodetector). Same as above) and the focus error signal FE, based on the data signal supplied from the photodiode.
Tracking error signal TE, slide error signal S
E, and the total light amount signal I (Inte
nsity) A comparator for generating SUM and a focus error signal FE are transmitted to the total light amount signal I of the magneto-optical disk 1.
It has an amplifier for normalizing by SUM and an amplifier for normalizing the tracking error signal TE by the total light amount signal ISUM of the magneto-optical disk 1.

In the present embodiment, in particular, the optical disk recording / reproducing device uses the DSP 9 to control the total light amount signal I of the magneto-optical disk 1 supplied from the optical block 3.
When the SUM falls below a predetermined threshold value, it is determined that the entire photodiode is in an abnormal state where a sufficient amount of light is not obtained, and the above-described servo operations of the focus system, tracking system, and slide system are stopped. .

The spindle driver 14 includes a DSP
The rotation drive is started by the spindle start / stop control signal SPSB output by the rotation frequency detector 9 and the rotation frequency detector F
G outputs four rectangular waves SPFG per one rotation of the spindle motor 2, and outputs a spindle lock signal SPLK when a predetermined number of rotations is reached.

Further, the optical disk recording / reproducing device is a DSP.
9, an A / D converter for converting the focus error signal FE to digital, a subtractor for obtaining a difference from the focus command value, and a filter for filter-compensating the difference;
A D / A converter that converts the filter output into analog and outputs the analog output to the focus driver 10 described above.
The optical disk recording / reproducing apparatus also includes an A / D converter (not shown) for converting a tracking error signal TE into a digital signal, a subtractor for obtaining a difference from a tracking command value, and a filter compensation for the tracking servo. And a D / A converter that converts the filter output to analog and outputs it to the tracking driver 11 described above. The optical disk recording / reproducing device also generates a slide error signal SE (not shown) in the DSP 9 for slide servo. A / to convert to digital
A D converter, and a subtractor that calculates a difference between the slide command value,
A filter for filter-compensating the difference;
And a D / A converter for outputting to

The read channel 7 includes an RF amplifier for generating a read data signal from a reproduced RF signal supplied from a photodiode, an equalizer for equalizing the phase of the read data signal generated by the RF amplifier, and a phase equalizer for the equalizer. A slicer for binarizing the equalized read data signal based on the reference power supply, and phase-locking the data signal supplied from the slicer to generate read data and a read gate signal, which are supplied to the optical disk controller 6 described above. And a PLL.

The optical disk controller 6 includes a SCSI controller for controlling a SCSI interface with the CPU, an address detector for detecting a recording or reproduction address from data supplied from the SCSI controller, and an address supplied from the address detector. , A gate generator that generates a write gate signal at the time of recording, generates a read gate signal at the time of reproduction, and supplies the read gate signal to the laser power controller (LPC) 8 described above, and a write that is supplied from the SCSI controller. A write buffer for holding data, a data encoder for modulating data held in the write buffer by, for example, (1,7) -RLL (Run Length Limited) modulation,
It has a data decoder for demodulating a read data signal supplied from the PLL by (1,7) -RLL demodulation based on a data clock, and a read buffer for holding the read data demodulated by the data decoder.

In this embodiment, in particular, the optical disk recording / reproducing apparatus includes, in the DSP 9, one of the spindle motors 2 supplied from the spindle driver 14.
When the time width of the four rectangular waves SPFG per rotation exceeds a predetermined threshold value, it is determined that the state is abnormal, and the servo operation of each system described above is stopped.

The operation of the thus configured optical disk recording / reproducing apparatus of this embodiment will be described. That is, in the optical disk recording / reproducing apparatus, various signals are generated by the optical disk controller 6 in accordance with recording or reproduction based on control data supplied from a CPU (not shown) via a SCSI interface. Various operations are performed by the DSP 9, the laser power of the laser diode of the optical block 3 is controlled by the laser power controller 8, and the laser diode emits a laser beam.

The details will be described below. First, the optical system will be described. In this optical disc recording and reproducing apparatus,
The laser beam emitted from the laser diode of the optical block 3 is transmitted by the beam splitter and reflected on one side, a power monitor signal is detected by the monitor diode, and the return light from the magneto-optical disk 1 is reflected on the other side. The laser beam transmitted by the beam splitter is condensed by the objective lens, and the return light from the magneto-optical disk 1 is transmitted. The return light from the magneto-optical disk 1 reflected by the beam splitter is polarized by a polarization beam splitter (analyzer), converted into light intensity, and an RF signal is detected by a photodiode. In the case of phase change recording on a phase change disk, data is recorded, reproduced, and erased by changing the laser power, and data is recorded by modulating a laser beam. Magneto-optical disk (MO)
In the case of magneto-optical recording, an external magnetic field is applied by a bias magnet 5 for generating an external magnetic field. The magneto-optical disk 1 is rotated by a spindle motor 2.

Next, the drive of the focus servo will be described. When one of the laser beams reflected by the beam splitter of the optical block 3 is received by the monitor diode and a power monitor signal is supplied to the DSP 9, the focus command value is amplified by the focus driver 10 in the DSP 9. When the command value amplified by the focus driver 10 is supplied to the focus coil, a current based on the amplified command value flows through the focus coil disposed in the magnetic field formed by the magnet in the two-axis actuator, and the magneto-optical The focus servo is performed by moving the objective lens with respect to the disk 1 in the focus direction.

The focus driver 10 is controlled so that the laser beam emitted from the optical block 3 is focused on the recording surface of the magneto-optical disk 1 rotated by the spindle motor 2.

Actually, the DSP 9 outputs the focus error signal F output from the photodetector in the optical block 3.
The control is performed such that E is always set to zero.

By the way, ideally, the point where the focus error signal FE becomes zero should be the same as the point where the information from the magneto-optical disk can be extracted most efficiently (the amplitude of the RF signal becomes maximum). However, actually, these points are not the same but are shifted, so this shift is called a focus bias, and the focus bias is normalized by the total light amount signal ISUM.

Next, the drive of the tracking servo will be described. When one of the laser beams reflected by the beam splitter of the optical block 3 is received by the monitor diode and a power monitor signal is supplied to the DSP 9, the tracking command value is amplified by the tracking driver 11 in the DSP 9. When the command value amplified by the tracking driver 11 is supplied to the tracking coil, a current based on the amplified command value flows through the tracking coil arranged in the magnetic field formed by the magnet in the two-axis actuator,
The tracking servo is performed by moving the objective lens with respect to the magneto-optical disk 1 in the tracking direction.

The tracking driver 11 is controlled so that the laser beam emitted from the optical block 3 follows the track on the recording surface of the magneto-optical disk 1 rotated by the spindle motor 2.

In practice, the DSP 9 controls the tracking error signal TE output from the photodetector in the optical block 3 so as to always be zero. Since this also has a shift similarly, this shift is called a tracking bias, and the tracking bias is set to the total light amount signal ISU.
It is normalized by M.

Next, the drive of the slide servo will be described. When one of the laser beams reflected by the beam splitter of the optical block 3 is received by the monitor diode and a power monitor signal is supplied to the DSP 9, the slide command value is amplified by the slide driver 12 in the DSP 9. When the command value amplified by the slide driver 12 is supplied to the slide block 4, the slide motor is driven, and the optical block 3 moves in the radial direction with respect to the magneto-optical disk 1, thereby performing slide servo.

The slide driver 12 includes the optical block 3
Is controlled in such a manner that the deviation of the objective lens from the center position in the track direction detected by the midpoint sensor is zero.

In practice, the DSP 9 controls the slide error signal SE output from the midpoint sensor in the optical block 3 so that it always becomes zero.

The function of each of the three drivers described above allows the laser beam to follow the track of the rotating magneto-optical disk 1 in a focused state.

In the present embodiment, in particular, in the optical disk recording / reproducing apparatus, the DSP 9 controls the DSP 9 to transmit the total light amount signal I of the magneto-optical disk 1 supplied from the optical block 3.
When the SUM falls below a predetermined threshold value, it is determined that the entire photodiode is in an abnormal state where a sufficient amount of light is not obtained, and the above-described servo operations of the focus system, tracking system, and slide system are stopped. .

Next, the focus error signal and the tracking error signal used for the focus servo and the tracking servo will be described. The return light from the magneto-optical disk 1 reflected to the other side by the beam splitter of the optical block 3 is received by the photodiode and a data signal is output. A focus error signal FE, a tracking error signal TE, and a total light quantity signal ISUM of the magneto-optical disk 1 are generated by a comparator based on the data signal supplied from the photodiode.
The focus error signal FE is normalized by the amplifier with the total light amount signal ISUM of the magneto-optical disk 1 in order to avoid being changed by the emission power of the laser diode.
The tracking error signal TE is similarly normalized by the total light amount signal ISUM of the magneto-optical disk 1 by the amplifier.

In the DSP 9, the focus error signal F
E is converted into a digital signal by an A / D converter. The difference between the digital focus error signal FE and the focus command value is output by the subtractor, and the difference is filter-compensated by the filter. The filter output is converted into an analog signal by a D / A converter and output to the focus driver 10 described above. In the case of the tracking servo, the tracking error signal TE is converted into a digital signal by the A / D converter (not shown) in the DSP 9, and the subtractor outputs the difference between the digital tracking error signal TE and the tracking command value. Filter compensation is performed by the filter, and the filter output is converted into an analog signal by the D / A converter and output to the tracking driver 11 described above. In the case of a slide servo, the slide error signal SE is converted into a digital signal by an A / D converter (not shown) in the DSP 9, and a digital slide error signal S is output by a subtractor.
The difference between E and the slide command value is output, and the difference is filtered and compensated by a filter.
The data is converted into an analog signal by the A converter and output to the slide driver 12 described above.

In the spindle servo system, the spindle motor 2 is driven by a spindle driver 14. The spindle driver 14 starts rotating in response to a spindle start / stop control signal SPSB output by the DSP 9, and outputs a spindle lock signal SPLK to the DSP 9 when a predetermined number of revolutions is reached. To stop the spindle motor 2, the polarity of the spindle start / stop control signal SPSB may be inverted. Note that the spindle driver 14 has four rotations per rotation of the spindle motor.
The rectangular waves SPFG are output to the DSP 9. The DSP 9 can recognize the approximate rotation speed of the spindle motor 2 based on the time width of the SPFG.

In this embodiment, in particular, the optical disk recording / reproducing apparatus includes, in the DSP 9, one of the spindle motors 2 supplied from the spindle driver 14.
When the time width of the four rectangular waves SPFG per rotation exceeds a predetermined threshold value, it is determined that the state is abnormal, and the servo operation of each system described above is stopped. Also, DSP9
Focus error signal FE, tracking error signal T
E. When the slide error signal SE exceeds a predetermined threshold, each warning code is set and each warning bit is set. Each warning bit is cleared and each warning code is
And each servo is continued.

Next, the reproduced RF signal will be described. From the data signal supplied from the photodiode of the optical block 3, a reproduced RF signal is generated by an RF amplifier.
With the read channel 7, the reproduced RF signal generated by the RF amplifier is equalized in phase by an equalizer, and its amplitude is optimized. The read data signal phase-equalized by the equalizer is binarized by the slicer based on the reference power supply. The read data signal supplied from the slicer is phase-locked by the PLL to generate a read data signal and a read clock signal, which are supplied to the optical disk controller 6 described above.

In the optical disk controller 6, the SCSI controller controls the SCSI
The interface is controlled. An address detector detects a recording or reproducing address from data supplied from the SCSI controller. A gate signal is generated by the gate generator based on the address supplied from the address detector, a write gate signal is generated during recording, and a read gate signal is generated during reproduction and supplied to the laser power controller 8 described above. At the time of recording, write data supplied from the CPU via the SCSI controller is held by the write buffer. The data held in the write buffer is, for example, (1,7) -RL
Laser power controller 8 modulated by L modulation
Supplied to At the time of reproduction, the read data signal supplied from the PLL is (1,7) -RLL demodulated by the data decoder based on the data clock. The read data demodulated by the data decoder is held by a read buffer and supplied to the CPU via a SCSI controller.

Next, the driving of the laser diode will be described. The laser power controller 8 generates a light emission data signal, which is a reference for light emission of the laser diode, from the write data in synchronization with the write clock at the timing of the write gate signal supplied from the optical disk controller 6. The emission data signal is DS
This signal is output in various values and waveforms by rewriting the values of the registers and the like inside the LPC 8 based on the control signal from P9, and controls the respective laser powers when erasing, recording or reproducing data.

The laser diode current detected by the monitor diode and the laser power controller 8
The error with the light emission data signal supplied from the
The power of the laser beam irradiated on the magneto-optical disk 1 is controlled to be constant by adjusting the current that is amplified by 0 and flows through the laser diode so that the current always becomes the light emission data signal. A current flows through the laser diode,
A laser diode emits a laser beam.

At the time of data erasure, the DSP 9 drives the bias magnet driver 13 to generate an external magnetic field on the magneto-optical disk 1 by the bias magnet 5.
At this time, as shown in FIG. 2, the bias magnetic field 23 in the magnetic field direction M1 is applied by the bias magnet 5 shown in FIG.

Next, the DSP 9 includes the slide driver 1
2. The tracking driver 11 is driven, and the optical block 3 is driven by the slide block 4 and the tracking coil.
Is moved to a desired position on the magneto-optical disk 1. Here, the laser is switched to the erasing output by the laser power controller 8, and the laser beam 21 shown in FIG. 2 is continuously irradiated by the laser diode via the objective lens 22 onto the recording film 20 rotating in the rotation direction R. The entire surface is magnetized in a certain direction by the bias magnetic field 23 generated by the bias magnet 5.

After erasing, as shown in FIG.
When a bias magnetic field 23 in a direction opposite to that of FIG. 2 is applied, the upper part of the bias magnet 5 shown in FIG.
A bias magnetic field 23 having a magnetic field direction M2 with an S pole on the lower side is applied to irradiate a laser beam 21 to the recording film 20 rotating in the rotation direction R via an objective lens 22 only on a pit portion to be recorded. As a result, only the irradiated portion is magnetized to the polarity of the bias magnetic field 23. At this time, as described above, the laser diode is driven by the laser power controller 8 based on the write data from the controller 6. In the case of the magneto-optical disk 1, the normal read (reproduction) power is about 1.5 mW, and the erase (erase) / write (record) power is about 11 mW.

Further, as shown in FIG. 4, the reproduction principle (Kerr effect) is used to perform reproduction using the Kerr effect (KerrEffect). The Kerr effect means that when a linearly polarized incident light 41 is incident on a perpendicularly magnetized recording film 40, the direction of deflection of the reflected light is + θk (M = 1) / − depending on the magnetization direction of the recording film 40.
Rotating in the θk (M = 0) direction. The reflected light is passed through an analyzer (analyzer) 42 and converted into light intensity. At this time, the read channel 7 converts the RF signal obtained by the photodetector 43 into a digital signal and supplies the digital signal to the controller 6. At this time, read channel 7
Must keep the reference value in an optimum state so that the binarization conversion into a digital signal is performed accurately. If the deviation from the optimum value is large, the jitter in the read data signal increases, and the conversion to the digital signal becomes inaccurate.

The linear encoder 15 is attached to a predetermined fixed portion on the inner peripheral side of the movable range of the optical block 3, while the linear scale of the slide block 4 is a VCM (voice coil motor) of the movable portion of the optical block 3. Are mounted in parallel with the linear encoder 15 on the coil of the linear encoder 15 so that when the movable portion of the optical block 3 moves on the inner peripheral side, the A phase and the B
A rectangular wave whose phase is shifted by 90 degrees from the phase is output.

The DSP 9 can recognize the moving amount and moving direction of the optical block 3 by detecting the wave number and phase of the rectangular wave output from the linear encoder 15. Similarly, the optical block 3 is moved to a desired position (for example, PEP (Phase Encoded).
Part of the control trac
ks) area). PEP has a function of changing the amplitude of an RF signal by alternately displaying regions having different reflectivities. This change is converted into a high-level / low-level digital signal by the read channel 7 and supplied to the pulse width counter of the DSP 9. The DSP 9 measures the high-level time width or the low-level time width, decodes the measurement result, and
8 bytes of record information are obtained. PEP will be described later.

FIG. 5 is a flowchart of the asynchronous error processing according to the present embodiment. In FIG. 5A, step S
In step 1, a laser warning interrupt process is performed. Specifically, for example, the interrupt processing is started when an abnormality occurs in the laser power.
When the total light amount signal ISUM of the magneto-optical disk supplied from the storage device falls below a predetermined threshold value, the entire photodiode is recognized as a fatal abnormal state in which a sufficient light amount is not obtained.

In step S2, a fatal error code of a laser error is set, and a fatal bit is set.

As described above, in the laser warning interrupt processing, the fatal bit is set, and the error code is set not to the attention code but to the fatal code.

In FIG. 5B, in the main routine processing in step S11, it is determined in step S12 whether any command processing has been completed. Specifically, it is determined whether the seek operation has been completed.

When any command processing is completed in step S12, it is determined in step S13 whether a fatal bit is set. If the fatal bit is not set in step S13, it is determined in step S15 whether the attention bit is set. If the attention bit is not set in step S15, an end message is transmitted to the CPU in step S18.

If the fatal bit is set in step S13, a fatal bit error message is transmitted to the CPU in step S14.

If the attention bit is set in step S15, the attention bit is cleared in step S16, and then an attention bit error message is transmitted to the CPU in step S17.

As described above, when the fatal bit is set in the main routine, the fatal code is set to C
Send to PU. The difference between the attention bit and the fatal bit is that the former is cleared in the main routine and does not affect the next command, whereas the latter is not cleared in the main routine, so the next command is always an error. Become. Therefore, an error occurs even if there is no problem in the execution content of the command itself. In other words, unless you clear the fatal bit dedicated to laser warning processing,
Keeps sending error messages to the CPU.

Incidentally, in the magneto-optical disk, PEP and SFP (Standard Ford) are provided on the inner and outer circumferences.
A control track called “mated part” is provided, and PEP can provide phase information, and SFP can provide media information (sensitivity, reflectance, etc.) and system information (track number, etc.). FIG. 7 is a diagram illustrating PEP data. FIG. 7A shows an example of phase encoding modulation of the PEP zone. In the PEP zone, 561 to 567 PEP channel bit cells exist for each physical track. The PEP channel bit cell is 656
PEP channel bit ± 1 PEP channel bit length. The PEP channel bit is recorded by a recording mark in either the first or the second cell. The recording mark is 2 PEP channel bit length,
It is separated from the adjustment mark by a space of 2 PEP channel bits. Zero appears due to a change from mark to space at the center of the cell, and 1 appears due to a change from space to mark at the center of the cell.

FIG. 7B shows the track format of the PEP zone. In the PEP zone, each physical track has three sectors. Each sector is 177 PEP bits across a gap.

FIG. 7C shows the sector format of the PEP zone.
7 bits. One sector is a 16-bit zero preamble, a 1-bit sync, an 8-bit sector number,
It is composed of 18 bytes, 8 bits of data, and 8 bits of CRC.

FIG. 8 shows the format of the data field of the PEP zone. Bit 7 of byte 0 is set in the format data. Bits 6 to 4 are set to logical ZCAV data. Bit 3 is set to zero. In bits 2 to 0, a modulation code of RLL (1, 7) is set. Bit 7 of byte 1 is set to zero. Bits 6 to 4 are set with ECC. Bit 3 is set to zero. Bits 2 to 0 are set with the user byte number. In the byte 3, the sector number of each logical track is set.

In the byte 3, the coefficient of the baseline reflection at the laser wavelength of 685 nm is set. Byte 4 is bit 7
Is set to zero. In bits 6 to 0, the amplitude and polarity of the pre-format data are set. Byte 5 is ODC
(Optical disk controller) The capacity is set. In the byte 6, the maximum read power in the SFP zone when the laser frequency is 50 Hz and the laser wavelength is 685 nm is set. In the byte 7, the disk type is set.

In byte 8, the start track outside the SFP zone and the MSB next to the logical track number are set. In the byte 9, the start track outside the SFP zone and the LSB of the logical track number are set. In the byte 10, the start track inside the SFP zone and the MSB next to the logical track number are set. Byte 1
1 indicates that the start track inside the SFP zone and the LSB of the logical track number are set.

In the byte 12, the track pitch is set. In the byte 13, data (FF) is set. In the byte 14, the start track outside the SFP zone and the MSB of the logical track number are set. In the byte 15, the start track inside the SFP zone and the MSB of the logical track number are set. Bytes 16 and 17 are undefined.

[0085]

According to the optical recording / reproducing apparatus of the present invention, an optical recording medium irradiates a laser beam from an optical pickup to record an information signal and detects the reflected light of the laser beam to reproduce the information signal. In the reproducing apparatus, control means for controlling the operation of recording or reproducing information based on the data of the reflected light of the laser light from the optical pickup, and performing error identification on the laser light by detecting the data on the laser light Error identification means for supplying an identification code to the control means, and error transmission means for transmitting an error message to the control means without erasing the identification code when detecting the identification code for identifying an error from the error identification means. Therefore, by optimizing the return process according to the type of asynchronous error, the most serious If, for example, a laser system error occurs, the control means may refuse any subsequent operations, making it impossible to maintain the normal state of the data, or changing the normal data recording state on the disc. This has the effect of reducing the possibility of not being able to be maintained.

In the optical recording / reproducing apparatus of the present invention, the error identifying means identifies the laser light error based on the amount of the reflected light of the laser light. This has the effect that the occurrence of a system abnormality can be identified.

Further, the optical recording / reproducing method of the present invention is directed to an optical recording / reproducing method which irradiates an optical recording medium with a laser beam from an optical pickup to record an information signal, and detects the reflected light of the laser beam to reproduce the information signal. In the reproducing method, an error identification step of identifying an error relating to the laser beam by detecting data relating to the laser beam, and transmitting an error message without erasing the identification code when the identification code identifying the error is detected in the error identification step. Error transmission step, and a control step of controlling the operation of recording or reproducing information based on the data of the reflected light of the laser light from the optical pickup in response to the error message. By optimizing the return process accordingly, the most If a serious error such as a laser error occurs, rejecting any further operations in the control step may result in the inability to maintain the normal state of the data, or recording of normal data on the disc. There is an effect that the possibility that the state cannot be maintained can be reduced.

In the optical recording / reproducing method of the present invention, in the above, the error identification step identifies the laser light error from the amount of the reflected light of the laser light. This has the effect that the occurrence of a system abnormality can be identified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical drive device to which an optical disk recording / reproducing device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating an erasing principle.

FIG. 3 is a diagram illustrating a recording principle.

FIG. 4 is a diagram showing a reproduction principle (Kerr effect), and FIG.
4B shows the effect of the reflected light on the recording film on the analyzer, FIG. 4B shows the light intensity of the reflected light before the analyzer, and FIG. 4C shows the light intensity of the reflected light after the analyzer.

FIG. 5 is a flowchart showing asynchronous error processing according to the embodiment of the present invention. FIG. 5A shows a laser warning interrupt processing, and FIG. 5B shows a main routine.

FIG. 6 is a flowchart showing a conventional asynchronous error process. FIG. 6A shows a sampling timer interrupt process, and FIG.
Represents a laser warning interrupt process, and FIG. 6C is a main routine.

FIG. 7 is a diagram for explaining PEP data, and FIG.
FIG. 7B shows an example of phase encoding modulation in the EP zone,
FIG. 7C shows the sector format of the PEP zone.

FIG. 8 shows a format of a data field of a PEP zone.

[Explanation of symbols]

1 ... Magneto-optical disk, 2 ... Spindle motor, 3 ...
... Optical block, 4 ... Slide block, 5 ... Bias magnet, 6 ... Controller, 7 ... Read channel, 8 ... Laser power controller, 9 ...
DSP, 10 focus driver, 11 tracking driver, 12 slide driver, 13
Bias magnet driver, 14 spindle driver, 15 linear encoder, 20 recording film, 2
1 ... laser light, 22 ... objective lens, 23 ... bias magnetic field, 40 ... recording film, 41 ... incident light, 42 ...
Analyzer 43 Photo detector

Claims (4)

[Claims] 1. An optical recording / reproducing apparatus which irradiates a laser beam from an optical pickup onto an optical recording medium to record an information signal, and reproduces the information signal by detecting reflected light of the laser light. Control means for controlling the operation of recording or reproducing information based on the data of the reflected light of the laser light, and performing error identification on the laser light by detecting the data on the laser light to perform the identification code. Error identification means for supplying to the control means, and error transmission means for transmitting an error message to the control means without deleting the identification code when detecting an identification code for identifying an error from the error identification means. An optical recording / reproducing apparatus characterized by the above-mentioned. 2. The optical recording / reproducing apparatus according to claim 1, wherein the error identifying means identifies the error of the laser light from the amount of the reflected light of the laser light. 3. An optical recording / reproducing method for irradiating an optical recording medium with a laser beam from an optical pickup to record an information signal, and reproducing the information signal by detecting reflected light of the laser beam. An error identification step of performing error identification on the laser beam by detecting data; and an error transmission step of transmitting an error message without erasing the identification code when an identification code identifying an error is detected in the error identification step. And an optical recording / reproducing control step of controlling information recording or reproducing operation based on data of reflected light of the laser light from the optical pickup in response to the error message. Method. 4. The optical recording / reproducing method according to claim 3, wherein the error identifying step identifies the error of the laser light from the amount of reflected light of the laser light.