JPH03290865A - Method and device for processing information - Google Patents

Abstract

PURPOSE:To certainly protect recorded information even when a medium temp. is raised up by providing a means for detecting the medium temp. and a means for ejecting the medium out of the device in accordance with a detecting result of the detecting means. CONSTITUTION:When the medium temp. detected by a thermistor 1 for detecting this temp. exceeds a prescribed value, the medium is ejected out of the device, whereas the ejection of the medium is performed after recognizing of a sequence control CPU 4 that the medium becomes under its ejectable state. The medium ejection is performed by issuing a medium ejection is performed by issuing a medium ejecting command from the sequence control CPU 4 to a motor control part 9. A motor 10 is driven by the motor control part 9 upon receipt of the command, and the medium is ejected out by a crank connecting rod 11. Consequently, information of the recording medium is prevented from being changed and erased. By this method, even when the temp, inside the device is abnormally raised up, the recorded information is certainly protected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for recording and/or reproducing and/or erasing information on a recording medium loaded into the device, and in particular, a device for monitoring the temperature of the medium. Changes in information and
The present invention relates to an information processing device and method configured to prevent data loss.

[Prior art]

In recent years, there has been active development of optical information processing devices that record or reproduce information at high density by irradiating an optical recording medium with a light beam. As such optical recording media, there are known write-once (WORM) type recording media that allow additional recording by -degrees, and erasable type recording media that use magneto-optical or phase change technology. Recording and reproduction of information will be explained below using a optical disc as an example.

A magneto-optical disk consists of a magnetic thin film having an axis of easy magnetization perpendicular to the film surface formed on a substrate, and information is recorded by changing the magnetization direction of the magnetic thin film. During recording, the magnetization direction of the magnetic thin film is first aligned in one direction, and while applying a bias magnetic field in the opposite direction to the magnetization direction, a laser beam digitally modulated according to the information (i! Then, the temperature of the irradiated part of the L=-the beam rises to near the Curie point, the coercive force decreases, and it is magnetized in the opposite direction to the surroundings due to the influence of the bias magnetic field, forming a magnetization pattern according to the information. The information recorded in this way can be optically read out using the well-known magneto-optic effect by irradiating the medium with a low-power unmodulated beam. Recorded information can also be erased by applying a magnetic field in the opposite direction to the bias magnetic field.

On the other hand, the above-mentioned recording media, especially magneto-optical recording media,
When the medium temperature exceeds a predetermined temperature, the recorded information changes or disappears due to changes in the material itself. Therefore, conventional devices are configured to detect the temperature of the medium, and when the detected temperature exceeds a predetermined value, reduce the power of the irradiated laser to protect the information.

[Problem to be solved by the invention] However, even in conventional devices that monitor the medium temperature, if the temperature rises further, the medium is placed inside the device even if it is not irradiated with a laser beam. There was a risk that information could change or disappear just by doing so.

[Means to solve the problem]

The present invention has been made in view of the above problems, and an object of the present invention is to provide an information processing device that can reliably protect recorded information even when the medium temperature rises.

A further object is to provide an information processing device that can reliably protect recorded information without interfering with a series of recording and/or erasing operations even if the medium temperature rises during recording and/or erasing operations. It is in.

The above object is an information processing apparatus that records and/or reproduces information on a recording medium loaded into the apparatus, including means for detecting the temperature of the medium, and corresponding to the detection result of the detecting means. In an information processing apparatus that records and/or erases information on a recording medium taken into the apparatus by providing means for ejecting the medium to the outside of the apparatus, a means for detecting the temperature of the medium; means for ejecting the medium out of the apparatus when the detected temperature exceeds a predetermined value, and means for stopping ejecting the medium when the detected temperature exceeds the predetermined value during a recording or erasing operation, and stopping the ejection of the medium when the operation is completed. This is achieved by providing control means for ejecting the medium if the next operation is not started within a predetermined time.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing an information processing apparatus according to a first embodiment of the present invention. In the figure, 1 is a thermistor for temperature detection, 2 is a resistor for converting the resistance change of the thermistor 1 due to temperature change into voltage, 3 is an A/D converter, and 4 is a first resistor for sequence control. 5 is a laser, a second CPU that controls a servo system, 6 is a laser system, 7 is a servo system, 8 is a spindle motor system, 9 is a control unit for a medium ejection motor, 10 is a medium ejection motor, Reference numeral 11 indicates a crank rod for driving a medium, 12 indicates a medium when inserted into the apparatus, 13 indicates a medium when ejected from the apparatus, and 14 indicates a power source.

FIGS. 2A and 2B show the sequence from temperature detection to stopping the operation in progress and discharging the medium.

The temperature of the medium is measured during the main program as shown in FIG. 2A.

Further, if the servo system is being driven in step 4, a servo stop command is sent to stop the servo system 7, as in the case of a laser.

In step 6, the driving state of the spindle motor is checked. If the spindle motor is being driven, the sequence control CPU 4 stops the spindle motor 8 in step 7.

In the processing from step 4 to step 7, the sequence control CPU 4 indicates that the medium can be ejected.
If it is recognized, the process proceeds to step 8 and the medium is ejected.

The medium is ejected by issuing a medium ejection command from the sequence control unit U4 to the motor control section 9. Upon receiving the command, the motor control section 9 drives the motor 10 and discharges the medium using the crank rod 11.

The above operations prevent information from being changed or erased from the recording medium. However, to be even more careful, perform the following actions.

In step 9, the sequence control CPU warns the user that the medium temperature has exceeded the specified value by lighting an LED or sounding a buzzer, and ends the interrupt processing.

By following this warning and moving the media being ejected away from the device, the user must also:
It is possible to reliably prevent information on the recording medium from changing or disappearing.

Note that the temperature of the medium in the present invention (including the second embodiment described later) refers to the temperature near the medium.

Here, first, the resistance change of the thermistor due to temperature is extracted as the voltage between the terminals of the voltage conversion resistor 2, and inputted to the A/D conversion section 3. The sequence control CPU 4 is
The medium temperature is recognized from the output data of the A/D converter 3.

On the main program, the medium temperature described above is compared with the specified temperature data set in the program, and if it is determined that the medium temperature exceeds the specified temperature, an interrupt is generated and the processing is executed in the interrupt program. Transition.

The specified temperature is set lower than the information destruction temperature at which information on the medium changes or disappears, and higher than the normal internal temperature of the apparatus.

FIG. 2A shows the processing flow of the interrupt program. In the interrupt program, first, in step 1, it is determined whether the medium temperature is at a temperature that would immediately cause recorded information to be destroyed.
If there is a possibility of destruction of recorded information, proceed to step 2 and immediately stop the operation being executed. Otherwise, proceed to step 3 and wait until the operation in progress is completed.

After the operation being executed is stopped or completed, in step 4, the driving states of the laser and servo are checked.

As a result of the determination, first, if the laser is being driven, in step 5, a command to stop the laser is sent from the sequence control CPU 4 to the laser servo control CPU 5, and the laser 6 is stopped.

In the first embodiment, the recording medium is ejected using the medium ejecting motor 10 and the medium driving crank rod 11, but the structure is not limited to this. A functioning ejection mechanism may also be used.

Next, a second embodiment of the present invention will be described.

A second embodiment of the present invention will be described in detail below with reference to FIGS. 3 to 7.

FIG. 3 is a schematic diagram of a magneto-optical recording device according to a second embodiment of the present invention. In the figure, 21 is a disk-shaped magneto-optical recording medium (hereinafter simply referred to as the medium) housed in the apparatus.
, 22 is a medium in a discharged state, 23 is a drive motor for discharging the medium, 24 is a spindle motor for rotating the medium, 2
5 is a thermistor that detects the medium temperature; 26 is an A/D converter for the thermistor for the central processing unit (CPU) to take in the medium temperature (the resistor that converts the resistance change of the thermistor into voltage is not shown) ), 27 is an information reproducing circuit, 28 is a tracking control circuit, 29 is a focus control circuit, 30 is a laser control circuit, 31 is a recording operation control circuit, and 32 is an optical pickup. The optical pickup 32 includes a laser diode 33 and a half prism 3.
It is composed of a 4.4-split sensor 35, an objective lens 36, and a collimator lens 37. 38 is an ejection prohibition control circuit that controls prohibition and permission of medium ejection, and as shown in FIG. 4, output e of the recording operation control circuit 31 or the servo system error determination circuit 39.

When either signal f is input, the output signal a becomes active, and the output signal a is held active for a time t after the inputs e and f are lost. This time t
During this time, if human power e or f is applied again, the above operation is repeated. The normal time t is set to be a time sufficient to complete a try operation when an error occurs during a recording operation, or a time sufficient to complete verification of write data after a recording operation. Reference numeral 39 denotes a servo system error determination circuit that determines tracking and focus errors from tracking error signals and focus error signals of the tracking control circuit and focus control circuit, 40 a CPU that controls the entire system, and 41 a bias magnet that applies a bias magnetic field. It is.

Signal a is a medium discharge prohibition permission control signal, which changes depending on inputs e and f as shown in FIG. When the signal a is at a high level (indicated by S1), it indicates to the CPU 40 a medium ejection permission state, and when it is at a low level (indicated by S), it indicates a medium ejection prohibited state. That is, in TI, the output a becomes discharge prohibited state with the start of the input e. Also, T,
Since there was an input e during the predetermined time t from to T,
The output a remains in the discharge prohibited state. and,
At T4, since there is no input e or f during the predetermined time t, the output a becomes 1 and the discharge permission state.

The signal is a media ejection motor drive signal that removes media 2 from inside the device.
A signal that the CPU 40 outputs to the medium ejection drive motor 23 when ejecting the medium. The signal C is medium temperature information, and is a signal that allows the CPU 40 to read the change in resistance value corresponding to the temperature change of the thermistor 25 using the A/D converter 26.

The signal d is a spindle motor drive signal, which is a spindle motor control signal for the CPU 40 to rotate the medium disk 21. Signal e is a servo system error detection signal, which is recorded,
The CPU detects when the laser beam deviates from the track or loses focus during playback or erasing operations.
A signal to inform 40. f is a signal indicating that recording is in progress;
Input to the emission prohibition control circuit.

In the apparatus shown in FIG. 3, information is recorded, reproduced, and erased in the following manner. The medium 21 is formed by forming a magnetic thin film having an axis of easy magnetization perpendicular to the film surface on a substrate, and information is recorded by changes in the magnetization direction of this magnetized thin film. During recording, first, the magnetization direction of the magnetic thin film is aligned in one direction in advance, and while a bias magnetic field in the opposite direction to the magnetization direction is applied by the bias magnet 41, the magnetic field is input to the recording operation control circuit 31. A digitally modulated laser beam is emitted from the laser diode 33 according to the information signal source. Then, the temperature of the area irradiated by the laser beam rises to near the Curie point, the coercive force decreases, and the area is magnetized in the opposite direction to the surrounding area due to the influence of the bias magnetic field, forming a magnetization pattern according to the information.

Information recorded in this manner can be optically read out using the well-known magneto-optic effect by irradiating the medium with a low-power unmodulated beam. In addition, by applying a magnetic field in the opposite direction to the bias magnetic field during recording,
You can also erase recorded information.

Next, the operation of the apparatus shown in FIG. 3 will be explained using FIGS. 5 and 6.

First, the operation when the medium temperature exceeds the specified temperature during the recording operation will be explained with reference to FIG. In response to the start of writing management data input from an external host control device (not shown), the recording operation control circuit 31 activates the signal f.

The signal is input to the discharge prohibition control circuit 38, and the signal a
is prohibited from being discharged (point A). While writing management data, the CPU 40 internally captures the medium temperature from the output of the thermistor 25 via the A/D converter 26 as output C 7, and constantly monitors the medium temperature. When the CPU 40 learns by monitoring the output signal C that the medium temperature has risen and exceeded the specified temperature, the CPU 40 checks the signal a and does not perform the medium ejection operation since the signal a is in the ejection prohibited state. Here, the spindle rotation stop signal instructs rotation, and the medium ejection motor drive signal remains in a non-driving state. Therefore, writing continues until the 0 point at which writing of management data ends. At point 0, there is no more management data input from the outside, so the signal f returns to its original state, but the ejection prohibition control circuit maintains the medium ejection prohibition state for an additional time t after the signal f is turned off.

Therefore, the CPU 40 does not eject the medium even after writing of the management data is completed. In normal information recording operation, during this time t, recording data corresponding to the management data is sent from the outside following the management data, so the signal f becomes active again and the discharge prohibition control circuit 38 is activated. , creates a state in which medium ejection is prohibited (point D). Then, one hour after the writing of the record data is completed (point E) and the signal f returns to its original state, the discharge prohibition control circuit 38 outputs the signal a.
The CPU executes the medium ejection operation at the point when the medium ejection is permitted (point F). The procedure for the medium ejection operation is to turn off the laser and stop the spindle motor with a signal (point F), then drive the medium ejection motor with a signal and then eject the medium (point G). As a result, the medium
It is discharged from the position shown at 21 to the position 22 (outside the device) in the figure. Note that signal C becomes high level at point B,
During the shaded area, the medium temperature exceeds the specified temperature.

Note that the specified temperature is set by the CPU as in the above-mentioned Embodiment I.
The temperature data is set as specified temperature data on the main program written in the CPU 40, and is constantly compared within the CPU 40 with the output indicated by the signal C.

In the case of the second embodiment, the specified temperature is set lower than the information destruction temperature and higher than the normal internal temperature of the apparatus, taking into account the continuous recording operation time. This records,
Even if the erasing operation is continued after detecting that the temperature exceeds the specified temperature, the temperature of the medium does not reach the information destruction temperature immediately, making it possible to securely protect the information.

Next, the operation when a temperature rise occurs during recovery of recording operation due to tracking or defocusing will be explained using FIG. 6. After starting writing of management data (point H), when tracking or focus deviation occurs during writing and a servo system error detection signal e is output from the servo system error determination circuit 39, the CPU 40 detects the signal e. Error recovery operation (tracking and correction of out-of-focus) by error recovery command from host computer.
and then start writing management data again (
K point). If the media temperature rises during error recovery (
Since the servo system error detection signal is input to the CPU 40 at points 1) and 2, and is also input to the discharge prohibition control circuit 38, the signal a indicates the discharge prohibited state. Therefore, even if the medium temperature information signal C is on, the CPU 40 does not perform the medium ejection operation. The servo system error detection signal e is normally active for only several hundred m5ec, but after returning to the original state, the medium ejection prohibition state is maintained by the ejection prohibition control circuit for a time t. For this reason, time t
If error recovery is completed between and rewriting is performed, the ejection prohibition state will start again from the start of rewriting the management data from point K. Medium ejection is prohibited until the signal a becomes ejection permission state at point M). When the CPU 40 confirms that the signal a is in the discharge permission state at point M, the CPU 40
0 discharges the media out of the device in the order described above.

In this way, the information on the recording medium is reliably protected.

In the second embodiment, ejection of the medium is prohibited not only during the recording or erasing operation but also within a predetermined time after the operation is completed. This is for the following reason. That is, in general, in an information processing device, along with data recorded on a medium, the recorded data is stored at any position (track or track) on the medium.
Management data indicating whether the data is stored is written.

In the actual recording operation, recording data is written following the management data, as shown in FIG. 7(a). but,
If the medium temperature exceeds a specified temperature during a recording operation and the medium is ejected, data writing will end prematurely. For example, in FIG. 7(b), the management data is N
In (c'), the recorded data is interrupted at a point 0. Furthermore, in FIG. 7(d), recording is interrupted when the management data has been recorded. Here, Fig. 7(d)
In this case, recording of the management data has been completed, but if this continues, there will be no recorded data corresponding to the management data, which will cause confusion in the management of recorded information. Such a problem can similarly occur when erasing information. The present invention solves the above problem by prohibiting ejection of the medium until a predetermined period of time has passed after recording or erasing is completed. For example, Fig. 7(d)
Even if the medium temperature exceeds the specified temperature at point P immediately after the recording of management data ends, the recording data is input within the predetermined time, so the medium is not ejected. Then, the medium is ejected only when the next operation is not started within a predetermined time after the recording of the recording data is completed.

The present invention can be applied in various ways in addition to the embodiments described above. For example, although the recording operation has been described in the embodiment, completely similar control can be performed in the erasing operation as well. Further, although the ejection prohibition time after the fall of the signal indicating that a recording or erasing operation is in progress and after the fall of the servo error signal is the same time t, these may be set to different times. For example, the prohibition time after the end of the operation is set to be longer than the gap time between the management data and the recorded data,
The prohibition time after a servo error can be separately set as a time in which error recovery can be sufficiently performed. Furthermore, the present invention is applicable not only to magneto-optical recording devices but also to other optical information processing devices, magnetic recording devices, and the like.

Further, since the specified temperature in the first and second embodiments differs depending on the type of recording medium used, it is preferable to configure the temperature setting so that it can be changed depending on the medium used. For example, data related to a specified temperature may be written on a recording medium in advance, and when used, the data on the recording medium is read using a laser beam for recording and/or reproduction and/or erasing, and the data is automatically set on the program. It is also possible to change the setting of the specified temperature data.

〔Effect of the invention〕

As explained above, according to the present invention, when the medium temperature exceeds a predetermined value, the medium is discharged from the apparatus. (1) Even when the temperature inside the apparatus rises abnormally, , recorded information can be reliably protected.

(2) Since there is no need to control the laser power or adjust the gain of the servo system associated with it, the device can be easily controlled in terms of circuit configuration and software.

The following effects were obtained.

Furthermore, when ejecting the medium based on the medium temperature, the present invention starts prohibiting the medium ejection every time a recording or erasing command is received, and stops the medium ejecting after a predetermined period of time has elapsed after the completion of recording or erasing. By allowing this, it is possible to prevent the writing of management data and recording data from being interrupted. Furthermore, by providing a state in which medium ejection is prohibited for a predetermined period of time even after a servo system error signal is detected, error recovery is possible even if tracking or defocusing occurs. 2A and 2B are flowcharts respectively explaining the operation of the apparatus shown in FIG. 1; FIG. 3 is a schematic diagram showing the first embodiment of the information processing apparatus of the present invention; 4, 5, and 6 are signal waveform diagrams of each part for explaining the operation of the device shown in FIG. 3, and FIG. FIG. 3 is a diagram showing a recording state and a state where recording is interrupted.

1.25... Thermistor 12.13.21.22... Recording medium 10.23...
・Media ejection data 1・1mg reading 3

Claims (1)

[Claims] 1) Recording and/or recording of information on a recording medium taken into the device
Alternatively, an information processing apparatus that performs playback, comprising: means for detecting the temperature of the medium; and means for ejecting the medium from the apparatus in response to a detection result of the detecting means. 2) The device according to claim 1, wherein the detection means is a thermistor. 3) In the apparatus according to claim 1, the ejection means is an ejection mechanism used for normal medium ejection. 4) Recording and/or recording of information on the recording medium loaded into the device
Or, in an information processing device that performs erasing, means for detecting the temperature of the medium, and means for ejecting the medium from the device when the detected temperature exceeds a predetermined value.
control means that stops ejecting the medium when the detected temperature exceeds a predetermined value during a recording or erasing operation, and causes the medium to be ejected if the next operation is not started within a predetermined time after the operation is completed; An information processing device comprising: 5) In the apparatus according to claim 4, when an abnormality occurs in the recording or erasing operation, the control means further stops ejecting the medium until a second predetermined time period elapses from the occurrence of the abnormality. 6) In the apparatus of claim 1, when the detected temperature exceeds a predetermined value during a recording or reproducing operation, the operation is immediately stopped and the medium is ejected. 7) In the apparatus of claim 1, when the detected temperature exceeds a predetermined value during a recording or reproducing operation, the medium is ejected after the operation is completed. 8) The apparatus according to claim 1, wherein the information processing apparatus is a magneto-optical information recording/reproducing apparatus. 9) The apparatus according to claim 4, wherein the information processing apparatus is a magneto-optical information recording/reproducing apparatus. 10) In a method for recording and/or reproducing information on a recording medium taken into a device, the step of detecting the temperature of the medium, and ejecting the medium from the device in response to the detection result of the sensing step. An information processing method comprising steps. 11) In the method according to claim 10, in the ejecting step, when the detected temperature exceeds a predetermined value during the recording or reproducing operation, the operation is immediately stopped and the medium is ejected. 12) In the method according to claim 10, in the ejecting step, when the detected temperature exceeds a predetermined value during the recording or reproducing operation, the medium is ejected after the operation is completed. 13) An information processing method for recording and/or erasing information on a recording medium loaded into an apparatus, including the step of detecting the temperature of the medium, and when the detected temperature exceeds a predetermined value, the medium is When the detected temperature exceeds a predetermined value during the recording or erasing operation, the ejection of the medium is stopped, and if the next operation is not started within a predetermined time after the above operation is completed, An information processing method comprising the step of ejecting a medium. 14) The device according to claim 4, wherein the detection means is a thermistor. 15) The apparatus according to claim 4, wherein the ejection means is an ejection mechanism used for normal medium ejection.