JP3768081B2 - Magneto-optical disk recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magneto-optical disk recording / reproducing apparatus configured to record a signal on a magneto-optical disk by a laser irradiated from an optical head and a magnetic field applied from a magnetic head.
[0002]
[Prior art]
When the temperature is increased locally by irradiating the magneto-optical disk with radiant energy such as a laser beam, the magnetic coercive force decreases, and the magnetic domains are arranged corresponding to the direction of the magnetic field acting on this region. Thus, a magneto-optical disk recording / reproducing apparatus configured to perform a signal recording / reproducing operation has been commercialized.
[0003]
[Problems to be solved by the invention]
Some magneto-optical disk recording / reproducing apparatuses divide the recording area of the magneto-optical disk into a plurality of bands, and control the rotational speed of the disk and perform signal recording / reproducing operations for each band. Such a device sets a laser output value suitable for the characteristics of each band by recording and reproducing the signal in a test writing area provided in each band before performing the signal recording operation, and the output value is converted into data. It is configured to be stored in a storage memory. In such an apparatus, the laser output is set based on the laser output value stored in the data storage memory, and a signal recording / reproducing operation is performed by the laser output.
[0004]
However, even when the recording operation is interrupted, the temperature of the magneto-optical disk rises due to the heat generated by the spindle motor that drives the magneto-optical disk to rotate, and its recording characteristics change. There are many problems that the laser output value stored in the memory is not the optimum laser output and the signal recording characteristics deteriorate.
[0005]
The present invention is intended to provide a magneto-optical disk recording / reproducing apparatus that solves such problems.
[0006]
[Means for Solving the Problems]
According to the first aspect of the invention, a laser output value suitable for each band is obtained by recording and reproducing a signal in a test writing area provided in each band which is a signal recording area, and is set for each band. The laser output value is stored in the data storage memory, and when the recording command signal is not output from the host device for a predetermined time, the laser output value is reset in the test writing area of the band used where the optical head is located. The reset laser output value is compared with the laser output value of the band in use stored in the data storage memory. If the output value is different, the reset laser output value is used for data storage. It is configured to be stored in memory.
The invention according to claim 2 obtains a laser output value suitable for each band by recording and reproducing a signal in a test writing area provided in each band which is a signal recording area, and is set for each band. The laser output value is stored in the data storage memory, and when the rotation stop command signal for the magneto-optical disk is output from the host device, the laser output value is reset in the test writing area of the band where the optical head is located. The reset laser output value is stored as the laser output value of the used band stored in the data storage memory.
[0007]
【Example】
FIG. 1 shows an embodiment of a magneto-optical disk recording / reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a magneto-optical disk in which signal recording areas are provided as a plurality of bands. When the magneto-optical disk is mounted at a mounting position provided in a magneto-optical disk recording / reproducing apparatus, it is mounted on a turntable (not shown). And is configured to be rotationally driven by the turntable. An optical head 2 is disposed below the magneto-optical disk 1 and focuses a laser beam emitted from a laser element (not shown) on a signal recording surface provided on the magneto-optical disk 1. An objective lens A that functions to follow a signal track provided on the signal recording surface is incorporated. Such an objective lens A is provided so as to be displaceable in the surface direction of the magneto-optical disk 1 by a displacement force by a focus coil (not shown), and at the same time by the displacement force by a tracking coil (not shown). It is provided to be displaceable in the radial direction.
[0008]
A pickup support member 3 supports the optical head 2 and is configured to be moved in the radial direction of the magneto-optical disk 1 by a pickup feed motor 4. A magnetic head 5 is mounted on the pickup support member 3 and is provided so as to be able to be displaced in the radial direction of the magneto-optical disk 1 with respect to the optical head 2. It is configured to be displaced.
[0009]
Reference numeral 7 denotes an RF signal amplifier circuit for amplifying and shaping the RF signal obtained from the photodetector incorporated in the optical head 2, and reference numeral 8 denotes the optical signal based on the signal obtained through the RF signal amplifier circuit 7. An optical head control circuit that performs a focusing control operation for focusing a laser beam emitted from a head 2 on a signal surface provided on the magneto-optical disk 1 and a tracking control operation for causing the laser beam to follow a signal track on the signal surface. A focus servo circuit for driving and controlling the focus coil and a tracking servo circuit for driving and controlling the tracking coil are incorporated.
[0010]
Reference numeral 9 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplification circuit 7 and performs demodulation operations of various signals. Reference numeral 10 denotes a signal that is demodulated by the digital signal processing circuit and receives light. It is a system control circuit for controlling the operation of the magnetic disk recording / reproducing apparatus. Reference numeral 11 denotes a pickup feed motor drive circuit whose operation is controlled by the system control circuit 10 and is configured to control the rotation operation of the pickup feed motor 4. A magnetic head motor drive circuit 12 whose operation is controlled by the system control circuit 10 is configured to control the rotation operation of the magnetic head motor 6. Reference numeral 13 denotes a magnetic head drive circuit whose operation is controlled by the system control circuit 10 and that a recording signal is applied to a coil incorporated in the magnetic head 5 during recording operation.
[0011]
Reference numeral 14 denotes a data storage memory in which a laser output value set for each band provided as a signal recording area in the magneto-optical disk 1 is stored corresponding to each band, and the magneto-optical disk 1 is mounted in the apparatus. The value set based on the setting operation of the laser output value in each band performed at the time of being performed is stored corresponding to each band. The magneto-optical disk recording / reproducing apparatus is configured such that its operation is controlled by a computer apparatus connected as a host device.
[0012]
As described above, the magneto-optical disk recording / reproducing apparatus according to the present invention is configured. Next, the operation will be described. When a command signal for performing a reproduction operation is input from the host device to the system control circuit 10, the control operation by the system control circuit 10 is started, and the reproduction operation of the signal recorded on the magneto-optical disk 1 is started. The
[0013]
During the reproducing operation, the magnetic head 5 that generates a magnetic field does not operate, and only the optical head 2 operates. The output value of the laser for performing such a reproducing operation is set in advance. The reproducing operation of the signal recorded on the magneto-optical disk 1 is performed by the optical head control circuit 8 for performing a focusing control operation for focusing the laser irradiated from the optical head 2 on the signal surface and a tracking control operation for following the signal track. Further, the rotation is performed by rotating the magneto-optical disk 1 by a rotation driving operation of the turntable by a spindle motor (not shown). The signal read out by the optical head 2 is input to the RF signal amplifier circuit 7 to be amplified and waveform-shaped, and then input to the digital signal processing circuit 9. The signal input to the digital signal processing circuit 9 is subjected to various digital signal processing and various signal demodulation operations. The signal processed in this manner is output to an external computer device or the like through an output circuit (not shown).
[0014]
Although the reproducing operation is performed in this way, the displacement operation of the optical head 2 in the radial direction of the magneto-optical disk 1 is performed by the rotation control operation of the pickup feed motor 4 by the pickup feed motor drive circuit 11. The rotational drive control operation of the pickup feed motor 4 is performed by detecting the amount of deviation of the objective lens A incorporated in the optical head 2, but such operation is well known and will not be described. When the pickup feeding motor 4 is rotated, the pickup support member 3 is moved in the radial direction of the magneto-optical disk 1, so that the optical head 2 and the magnetic head 5 can be moved. The moving operation of the optical head 2 and the magnetic head 5 is performed in the same manner during the recording operation.
[0015]
As described above, the reproducing operation in this embodiment is performed. Next, the recording operation will be described. When the magneto-optical disk 1 is mounted in the apparatus, first, an operation for determining whether or not the mounted magneto-optical disk 1 is a recordable disk is performed. If it is determined that the disk is a recordable disk, Perform the recording and playback operation of the signal in the trial writing area of each band, perform the setting operation of the optimal laser output to perform the recording operation in each band, and the data corresponding to the set laser output value for each band The operation of storing in the storage memory 14 is performed.
[0016]
When a command signal for performing a recording operation is output from the computer apparatus to the system control circuit 10 after the above-described laser output setting operation is performed, the control operation for performing the recording operation by the system control circuit 10 Is started. Such a recording operation is performed by applying a recording signal to the magnetic head 5 while performing an operation of focusing and following a laser irradiated from the optical head 2 on the signal track. A recording signal is input to the magnetic head driving circuit 13 through a recording signal input circuit (not shown), and a signal output from the magnetic head driving circuit 13 is applied to the magnetic head 5 to record a data signal or the like. Can be recorded on the magneto-optical disk 1. A signal can be recorded in each band provided on the magneto-optical disk 1 by such a recording operation. The value of the laser output for performing such a recording operation is stored in the data storage memory 14. Set based on data.
[0017]
As described above, the reproducing operation and the recording operation in this embodiment are performed. Next, the gist of the present invention will be described. The recording operation is performed based on the laser output value set for each band. However, when the computer apparatus performs other processing operations in the middle of recording, the magneto-optical disk recording / reproducing apparatus interrupts the recording operation. It becomes a state. In such a state, if the rotational drive operation of the magneto-optical disk 1 is continued, the temperature in the apparatus rises due to heat generated by the rotation of the spindle motor, and the temperature of the magneto-optical disk 1 also rises. It will be. As a result, the recording characteristics of the magneto-optical disk 1 change.
[0018]
In such a state, that is, when a command signal for recording is not output from the computer device for a predetermined time, the optical head 2 is provided in the band where the optical head 2 is currently located, that is, the band used for recording. The most suitable laser output value setting operation at the present time is performed by recording and reproducing the signal in the trial writing area. The laser output value obtained by such setting operation is stored in correspondence with the use band stored in the data storage memory 14. That is, a rewriting operation is performed in which the laser output value that has been stored in the data storage memory 14 is changed to a new laser output value.
[0019]
Since the data rewrite operation is performed when the command signal for recording is not output from the computer device for a predetermined time, the signal recording operation to be started next based on the command signal for recording is newly set. Therefore, the recording operation on the magneto-optical disk 1 can be performed in an optimum state.
[0020]
In this embodiment, when a command signal for recording is not output from the computer device for a predetermined time, a new setting operation of the laser output is performed, but a command signal for stopping the rotation of the magneto-optical disk 1 is sent from the computer device. It can also be done when it is output. That is, when a stop command signal for interrupting the signal recording operation by the user's will is output from the computer device, the band in which the optical head 2 is currently located, that is, the band used for recording. The most suitable laser output value setting operation at the present time is performed by recording and reproducing the signal in the test writing area provided in the above. After the laser output value obtained by such setting operation is stored in correspondence with the use band stored in the data storage memory 14, the rotation of the spindle motor is stopped. By performing such an operation, the recording operation can be started with an optimum laser output value when a command signal for performing the next recording operation is output.
[0021]
As described above, the laser output setting operation is performed in the trial writing area of the band where the optical head 1 is located, and the output value is stored in the data storage memory 14. If the comparison is made between the stored output value and the newly set output value and the rewrite operation is performed only when the output value is different, there is an advantage that unnecessary rewrite operation is not performed. is there.
[0022]
【The invention's effect】
According to the present invention, when a recording command signal is not output from a host device for a predetermined time, the laser output value set for each band, which is a signal recording area, is stored in a data storage memory in a used band. Since the set laser output value is stored, the laser output value to be stored in the data storage memory can be recorded for a predetermined time even when the laser output value is not updated due to a change in the band used for recording operation. By updating the laser output value stored in the data storage memory on the condition that no data is output, the recording operation can be performed accurately even if the recording characteristics of the magneto-optical disk change due to temperature rise or the like. In this case, the reset laser output value is compared with the laser output value of the operating band stored in the data storage memory, and if the output value is different, the reset laser output value is stored as data. Since it is stored in the memory for use, useless rewriting operation can be prevented.
[0023]
Further, the present invention obtains a laser output value suitable for each band by recording and reproducing a signal in a test writing area provided in each band which is a signal recording area, and laser output set for each band. The value is stored in the data storage memory, and when the rotation stop command signal for the magneto-optical disk is output from the host device, the laser output value is reset in the test writing area of the band where the optical head is located. Therefore, the recording operation when the recording operation is resumed can be performed accurately.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a magneto-optical disk recording / reproducing apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magneto-optical disk 2 Optical head 5 Magnetic head 8 Optical head control circuit 9 Digital signal processing circuit 10 System control circuit 13 Magnetic head drive circuit 14 Data storage memory

Claims (3)

A signal recording area is formed by a laser irradiated from an optical head arranged on one side of a magneto-optical disk provided as a plurality of bands and a magnetic field applied from a magnetic head arranged on the other side. In a magneto-optical disk recording / reproducing apparatus configured to record a signal on the magneto-optical disk, a laser output value suitable for each band is obtained by recording / reproducing the signal in a test writing area provided in each band. In addition, the laser output value set for each band is stored in the data storage memory, and when the recording command signal is not output for a predetermined time from the host device, laser output is performed in the test writing area of the band used where the optical head is located. There resetting line operation value, the re-set laser output value and the data storage memory to the stored using band Comparing the laser output value, when the output value is not different, the magneto-optical disc recording and reproducing apparatus is characterized in that so as to store the re-set laser output value data storage memory. A signal recording area is formed by a laser irradiated from an optical head arranged on one side of a magneto-optical disk provided as a plurality of bands and a magnetic field applied from a magnetic head arranged on the other side. In a magneto-optical disk recording / reproducing apparatus configured to record a signal on the magneto-optical disk, a laser output value suitable for each band is obtained by recording / reproducing the signal in a test writing area provided in each band. At the same time, the laser output value set for each band is stored in the data storage memory, and when a rotation stop command signal for the magneto-optical disk is output from the host device, in the test writing area of the used band where the optical head is located There row reset operation of the laser output value, used vans stored the re-set laser output value data storage memory Magneto-optical disc recording and reproducing apparatus is characterized in that so as to be stored as the laser output value.   The reset laser output value is compared with the laser output value of the used band stored in the data storage memory. If the output value is different, the reset laser output value is stored in the data storage memory. 3. The magneto-optical disk recording / reproducing apparatus according to claim 2, wherein the recording is performed.

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