JPH10255349A - Recording and reproducing method for recording medium and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a recording medium with an optical pulse width by recording a test recording data in advance while changing the pulse width and selecting a recorded pulse width from the intensity of a reproduced signal of the test recording data detected by reproducing an adjacent nonrecorded groove or land. SOLUTION: When the temp. difference between the recording and reproducing device and the outside is not large, on a magnetic recording medium, various recording magnetic field width corresponding to the test data are impressed and recorded, and recording magnetic field width corresponding to an optimum magnetic domain value is obtained from the intensity of the test data detected by reproducing an adjacent nonrecorded track. On a magnet-optical recording medium, various test data is recorded in changing a laser light pulse in width and intensity, and an optimum magnetic domain is selected from reproducing intensity of the test recording data detected by reproducing a boundary part between a recording track and its adjacent track, so as to obtain the optimum values of the laser light pulse and a magnetic field pulse in width and intensity respectively. The reproduction of the test recording data is performed by making a changeover from a user information track reproducing system to a test recording data only reproducing system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for an information recording medium and a method therefor, and more particularly, to accurately determine and control an optimum recording element width such as a recording signal pit width and a magnetic domain width. The present invention relates to an information recording / reproducing apparatus that can perform the information recording and reproducing.

[0002]

2. Description of the Related Art In recent years, with the development of information technology and the increase in the amount of information, optical memories capable of recording a large amount of information have been used. Magneto-optical recording media have been actively developed as optical memories capable of rewriting recorded information. An optical modulation method and a magnetic field modulation method are known as information recording methods for such a magneto-optical recording medium. In the light modulation method, data is irradiated by irradiating a laser beam modulated according to data to be recorded, while applying a DC magnetic field weaker than the coercive force of the magneto-optical film to a magneto-optical film formed on a substrate. Recording is performed (for example, refer to JP-A-52-23318). In this method, recording is always performed while applying a magnetic field in a fixed direction. Therefore, in order to re-record data in an area where data is recorded, it is necessary to newly record after erasing a recorded portion. That is, this method cannot directly overwrite data.

On the other hand, in the magnetic field modulation method, data is recorded by applying a modulated magnetic field pulsed in accordance with coded data while irradiating a direct current laser beam to the magneto-optical film (for example, see Japanese Patent Application Laid-Open Publication No. H11-163873). (See No. 51-107121). According to this method, the data can be recorded by directly reversing the magnetization direction of the recording medium in accordance with the bit data “0” and “1”. Overwriting can be performed. However, since the laser beam is radiated in a DC manner, the recording mark becomes crescent shaped longer in the laser beam irradiation direction as the linear velocity increases, which is disadvantageous in signal processing. Further, in a region where an external magnetic field is not applied at the time of magnetic field switching, the magnetic domain becomes indefinite, and the S / N
There is a problem in terms of ratio.

As a technique for improving the magnetic field modulation method, Japanese Patent Application Laid-Open No. 1-292603 discloses a magnetic field having a polarity corresponding to recording data while heating a magneto-optical recording medium with a pulse laser beam of a constant frequency synchronized with the recording data. (Hereinafter referred to as an optical magnetic field modulation method). According to this technique, it is shown that the above-mentioned disadvantages of the magnetic modulation method can be solved and a stable recording mark can be obtained.

[0005]

In a magneto-optical disk, an optical disk, and the like, the width of a recording pit or a recording magnetic domain increases as the pulse intensity and pulse width of a laser beam, a magnetic field, and the like increase. FIG. 1 shows that the temperature environment of the optical disc recording / reproducing apparatus is D
When power is input at ° C and E ° C, the temperature of the optical recording medium inside the recording / reproducing apparatus rises from (1) to (3) and from (2) to (4). FIG. 1 shows a high room temperature E ° C. where the optical disk recording / reproducing apparatus is placed.
In the case of (3), the temperature (4) of the optical recording medium is higher than that of (3) in the case of D ° C., and each temperature environment is (1),
Corresponding to the increase in the order of (2), (3), and (4), the size of the recording pits obtained by irradiating a laser beam with a constant output is a, b, c, and d. It shows that it becomes larger in order.

Further, the heat generation temperature inside the recording / reproducing apparatus is:
The type of recording / reproducing apparatus differs depending on the manufacturer of the recording / reproducing apparatus. For example, a recording / reproducing apparatus for a 3.5-inch magneto-optical disk, a recording / reproducing apparatus for a 5-inch magneto-optical disk,
It differs depending on the recording / reproducing device for CD-R and the like.

Further, while the recording / reproducing operation of the recording medium is continuously performed, environmental conditions change every moment as time elapses, and the heat radiated from the power supply system after the power supply of the recording / reproducing apparatus is input. Accordingly, the recording environment temperature in the recording / reproducing apparatus changes every moment. The method of changing the recording environment temperature in the recording / reproducing apparatus differs depending on the state of the atmospheric temperature environment where the recording / reproducing apparatus is placed.

If the width of the recording pits or recording magnetic domains is too wide, crosstalk noise between adjacent tracks will occur, causing a reduction in the S / N ratio. In a high-density recording medium, it is necessary to further narrow the track pitch to form recording pits having a high recording density in the track width region.
Therefore, there is a need for a technique for controlling the width of a recording pit or a recording magnetic domain, or the recording position of a recording pit or a recording magnetic domain in a track with higher accuracy.

[0009]

According to the present invention, as shown in FIG. 2, when information pits are recorded on a recording medium inside a recording / reproducing apparatus, even if the external environmental temperature of the recording / reproducing apparatus changes,
Provided is a method for constantly forming a pit having an optimum size even when the amount of heat generated and emitted inside the recording / reproducing device changes, and a recording / reproducing device capable of using the method.

The present invention provides a recording / reproducing apparatus and a recording / reproducing method for recording according to the following aspects.

(1): At the start of operation of the recording / reproducing apparatus or at the time of initial recording (virgin recording) of an unrecorded recording medium, test recording data is recorded on an unrecorded recording track of the recording medium while changing the pulse width. Forming a plurality of different test recording pits or test recording magnetic domains, and then forming an adjacent unrecorded groove portion, land portion, boundary between land portions / land portions,
Alternatively, the data is reproduced by an optimum method according to the format of the recording medium selected from the land portion / groove boundary, and the value of the pulse width of data that does not cause crosstalk is obtained.

(2): In the vicinity of a recorded track on which user information is already recorded, for example, a non-recording track adjacent to the user information recording track, or a non-recording track jumping one or more tracks from the user information recording track,
Test recording data is recorded while changing the width of pits or magnetic domains, and thereafter, the boundary between one of the tracks selected from adjacent tracks on both sides of the test recording track and the track on which the test recording was performed, or the test recording track Tracking either one of the non-recorded tracks on both sides of the test track data, determine the optimum test data pulse width and intensity, laser beam intensity, or magnetic field intensity values that do not cause crosstalk from the test record data. Ask.

(Third): A test pulse is recorded while changing the pulse width on an extension of a recording track on which user information is already recorded or on a non-recording track adjacent to the extension, and thereafter, When the test recording data is reproduced by tracking the boundary between the track on which the user information is already recorded and the adjacent track, an optimum value of the pulse width of the test data without crosstalk is obtained.

The first mode is a point in time when the temperature environment inside the recording / reproducing apparatus is not much different from the temperature environment of the outside atmosphere.

The test record data recorded on the land is
In a method of reproducing test recording data by tracking a non-recording narrow groove such as a concave groove, the amount of reflected laser beam spot irradiated is lower than that in tracking a land. Therefore, a control circuit for correcting the tracking reflected light amount which is reduced when switching to the tracking of the non-recording narrow groove of the V-shaped groove in order to reproduce the test record data from the tracking reflected light amount at the time of test recording on the land is performed. Used. That is, when switching to tracking of the non-recording narrow groove of the V-shaped groove for reproducing the test recording data is performed, the peak hold control circuit is operated for the tracking to perform the reproduction tracking of the test recording data.

The recording medium is composed of a wide groove portion and a wide land portion, and the test data is recorded on the track of the wide land portion or the wide groove portion, and a groove / land boundary is formed on the track on which the test data is recorded. A step of detecting the reproduction signal intensity of the test data and obtaining the optimum values such as the pulse width and intensity of the laser light and the pulse width and intensity of the magnetic field based on the level. The step of performing the magneto-optical recording by using the pulse width and intensity of the laser beam, the pulse width and intensity of the magnetic field, and the like.

A recording medium is composed of one of a groove portion and a land portion. Each time test data is test-recorded on a track, an adjacent unrecorded track is reproduced, and a reproduction signal intensity of the test data is detected. The method includes a step of obtaining the optimum value of the recording signal pulse width and the intensity based on the level, and a step of executing the obtained optimum value of the recording signal pulse width and the intensity on the recording medium.

By applying various recording magnetic field widths of a polarity corresponding to the test data to unrecorded tracks of the magnetic recording medium, the test data is recorded as various recording magnetic domains, and the various recording magnetic domains are reproduced. In the magnetic recording / reproducing method and the magnetic recording / reproducing apparatus, a step of recording test data having various magnetic domain widths and intensities while changing a magnetic field width, and, for the recorded test data, an adjacent unrecorded groove portion, Alternatively, a step of reproducing a track such as an unrecorded land, detecting a reproduction signal intensity of test data, selecting an optimum recording magnetic domain from the level, and obtaining a recording magnetic field width corresponding to the optimum magnetic domain value; A recording / reproducing method and a recording / reproducing apparatus for a magnetic recording medium including a step of executing magnetic recording with a determined recording magnetic field width.

A magneto-optical recording / reproducing method for recording a magneto-optical recording medium on which tracking by sample servo is performed by applying a recording magnetic field while heating with a laser beam, and reproducing the recorded magnetic domains by utilizing a magneto-optical effect. Recording various kinds of test data in which the pulse width and pulse intensity of the laser light pulse are changed; and reproducing a track at which the recorded test recording data exists and a boundary portion between adjacent tracks, thereby performing test recording. The recording magnetic domain is detected from the intensity of the data reproduction signal, and the optimum recording magnetic domain is selected from the level, and the optimum values of the width and intensity of the laser light pulse and the magnetic field pulse are obtained. A recording / reproducing method and a recording / reproducing apparatus for a magneto-optical recording medium including a step of obtaining the optimum value and a step of executing magneto-optical recording with the obtained optimum laser light and the pulse width and pulse intensity of the magnetic field are provided.

At the time of the second and third aspects of the present invention, the temperature inside the recording / reproducing apparatus is considerably higher than the temperature of the outside atmosphere.

According to the second and third aspects, when the recording / reproducing apparatus generates a crosstalk noise during the recording operation of the information signal and the S / N ratio is lowered, the recording of the information is continued. Equip the recording / reproducing device with a program software and system for displaying a warning about information recording so as to generate a signal to warn about the situation or to give a signal to forcibly stop the continuation of information recording. Is preferred. Then, from the time when this warning occurs, or to the position immediately before the occurrence of the crosstalk noise in the information recording, after erasing the unnecessary information, or after starting the trial writing of the test recording data by overwriting. Is also good. The recording / reproducing apparatus includes a dedicated IC memory for temporarily storing unnecessary information after immediately before the occurrence of crosstalk noise in the recorded information and storing the information until the recording resumes to a normal state. It is preferable to include a computer program software and a control circuit for forcibly erasing a necessary information portion and forcing a correct recording restart position designation and information search, determination, resumption, and the like.

Further, in order to operate the test writing of the test data, a recording medium comprising at least one of a groove portion and a land portion is provided with an unrecorded portion at the extension destination of the position where the user information recording is stopped. The test recording data is recorded on the track. Each time the test data is written, the reproduction signal may be obtained by tracking the boundary between the adjacent unrecorded track and the track on which the test recording has been performed. The method of obtaining the reproduction signal of the test recording data by tracking the boundary of the test data can detect the reproduction signal intensity of the test recording data, and the optimum value of the laser light pulse width and the intensity can be obtained from the level.

According to the third aspect, to operate the test recording, test recording data may be recorded on a specific test recording track, and a reproduction signal may be obtained by tracking an adjacent unrecorded track. However, a method of obtaining a reproduction signal by tracking a boundary between an adjacent track on which information has already been recorded and a track on which test recording has been performed, detects the reproduction signal intensity of the test data, and uses the laser light pulse based on the level thereof. Optimum values for width and strength can also be determined. Detecting the reproduction signal intensity of the test recording data by the latter method, and obtaining an optimum value of the laser light pulse width and intensity based on the level; and performing optical recording based on the obtained laser light pulse width and intensity. And

When the recording / reproducing apparatus generates crosstalk noise during the recording operation of the user information and the S / N ratio is lowered, a signal is issued to warn the user that the recording of the information is continued, or It is preferable to equip the recording / reproducing apparatus with program software and a system for performing a warning display on information recording so as to give a signal such as forcibly stopping continuation of information recording. Also in this case, the recording / reproducing apparatus erases unnecessary information immediately before and after the occurrence of crosstalk noise in information recording,
It is preferable that test recording be automatically performed by automatically entering test recording or by overwriting from the position immediately before the occurrence of crosstalk noise, and the normalization process of the recording / reproducing apparatus be performed quickly.

In order to carry out the present invention, the recording / reproducing apparatus has been required to perform test recording and to record test data in addition to the normal servo signal circuit for user recording / reproducing information. When reproducing test data, the test data must be prioritized to reproduce the test data. In reproducing the test data, the reproducing head must track a non-recording track, and a tracking error signal for the non-recording track is transmitted. It is necessary to provide a switching device for switching tracking from a test recording track to a non-recording reproduction track, a switching device for a tracking error signal, and a control circuit.

In the recording / reproducing apparatus embodying the present invention, when test recording is required and test data is recorded, reproduction of test data is prioritized, and non-recording for reproducing test data is performed. In the case of using a recording medium for transmitting a differential tracking error signal for track tracking and causing the reproducing head to perform tracking, a differential tracking error signal is transmitted to a servo signal circuit system for user recording / reproducing information of the recording / reproducing apparatus. Then, it is necessary to equip a control device and a switching device for switching to a differential tracking error signal for switching from tracking of a test recording track to tracking of a non-recording reproduction track.

In the recording / reproducing apparatus embodying the present invention, when test recording is required and test data is recorded, reproduction of the test data is prioritized, and tracking for reproducing the test data is performed. As described above, when a recording medium having a format for transmitting a tracking error signal and / or a differential tracking error signal and tracking test recording data on a non-recording track is used, the recording / reproducing apparatus uses a recording medium for user recording / reproducing information. Sends a tracking error signal to the servo signal circuit system,
A tracking error signal switching device and a control circuit for switching the tracking from the test recording track to the non-recording reproduction track for reproduction, and a differential tracking error signal is transmitted to perform the recording-free reproduction from the tracking of the test recording track. A device for switching to tracking of a track, a device for switching to a differential tracking error signal, and a control circuit are provided together.

The test data includes at least one of the data which cannot be clearly reproduced by the reproducing head at the environmental temperature in the recording / reproducing apparatus and the data which causes a crosstalk to the recording information element of the adjacent track, preferably both. It is necessary to use what is being used. In addition, the test recording data is obtained by selecting at least one means selected from the intensity of a laser beam spot, the pulse width and intensity of a laser beam, and the width and intensity of a magnetic field. This is data of a plurality of pulse signal recording elements that appear for each variable such as width or intensity.

Regardless of which of the first, second, and third aspects is effected, test recording (test writing) of test data is performed for the pulse width and intensity of the recording laser light. Accordingly, it is necessary to find an optimum value that does not cause crosstalk, and to detect a lower limit value of an optimum size for a pit or a magnetic domain that can be reproduced (readable). The range of the test recording data for detecting the lower limit of the optimum value of the size of a pit that can be reproduced (readable) or the size of a magnetic domain or the like is the range (lower limit) that can be read from the data recorded on the recording medium. The inspection range must include both a range (upper limit) where no crosstalk occurs between adjacent tracks. The test record data must include both pits or magnetic domains of a size that cannot be reproduced and pits or magnetic domains that cause crosstalk.

When recording / reproducing at an abnormally low temperature of −10 ° C. in a magneto-optical recording / reproducing apparatus for high-density recording, which is set as a standard at room temperature, for example, at room temperature of 25 ° C. The heating temperature of the light pulse may fall to a required level or less, and when the recorded magnetic domain size is recorded at a size equal to or less than the readable lower limit, even in the low temperature environment, reproduction is performed at room temperature. Can not do.
In order to form a recording pit or a recording magnetic domain of a size that can be read even at such an abnormally low temperature, the present invention is to test the pulse width and intensity of various laser light pulses under the low temperature environment. Provided is a recording / reproducing apparatus having a function capable of obtaining an optimum value by performing test recording of data and recording with the optimum value.

As described above, when the recording / reproducing apparatus is placed under the normal temperature or the environmental temperature condition deviating from the standard, the recording / reproducing apparatus has a function of automatically detecting the environmental temperature. A recording / reproducing apparatus provided with a function of recording data for use and automatically obtaining an optimum value of a laser pulse width and an intensity for recording.

In particular, test recording data including all data that cannot be clearly reproduced by the reproducing head, data that can be clearly reproduced, and data that causes crosstalk with the recording information element on the adjacent track is provided. Provided is a recording / reproducing device. For example, when the recording / reproducing apparatus temporarily falls into an environment such as an abnormal low temperature of -5 ° C. to -50 ° C., and the recording / reproducing conditions of the recording / reproducing apparatus remain at the normal temperature, the reproduction is possible. Provided is a recording / reproducing apparatus having a function of selecting and setting an optimum power with respect to the width and intensity of a laser light pulse so that a recording signal can be recorded, and performing a recording operation.
That is, the recording / reproducing apparatus provided by the present invention can detect and optimally execute the optimum recording signal condition for preventing the crosstalk by reproducing the test recording data by the reproducing operation head. Things.

The recording of test data in the present invention is not particularly limited in access to a recording medium. In the case of a magneto-optical recording medium, when the need for user information suddenly occurs during recording and reproduction, recording and reproduction of test data are immediately performed with priority in any place of the medium. The access to the recording and reproduction of the test data can be performed automatically or manually. Also, it can be specified or limited to a specific position on the medium. If it is necessary to perform recording and reproduction of test recording data prior to user information recording during recording and reproduction of user information, recording may be performed continuously from the non-recording position, which is an extension of the same track. Alternatively, recording may be performed on an adjacent non-recorded track, or may be performed while skipping at least one unrecorded track. The non-recording position where the test data is recorded on the track following the user information recording is
It may be a non-recorded track after erasing the user record information.

In the recording / reproducing apparatus of the present invention, after the test data is recorded on the recording medium, the track on which the test data is recorded is reproduced, and the optimum recording signal for reproduction and the recording condition of the recording signal are determined from the test data. It is also an object of the present invention to have a control circuit to detect and a system to execute. The optimum recording signal and recording conditions are determined from among a plurality of optimum recording data groups detected from the test data.
In particular, with respect to the recording element having the smallest size, the optimum laser light pulse width and intensity or the magnetic field width and intensity are detected. Among the optimum recording data, the data having a particularly small size of the recording element indicates a function of substantially preventing crosstalk. The optimum recording conditions of the signal to be executed are conditions selected from three means such as a laser light pulse width and intensity, a combination of laser light pulse width and intensity and a magnetic field, and a magnetic field width and intensity. Further, the recording / reproducing apparatus of the present invention detects environmental temperature near the surface of the recording medium in the recording / reproducing apparatus, and includes data and detecting means for detecting an optimum recording signal and recording conditions with respect to the environmental temperature. This is a recording / reproducing apparatus which holds an IC memory for storing and a means for executing this detecting means. The recording / reproducing apparatus of the present invention receives the optimum recording signal and the recording condition with respect to the environmental temperature and detects the laser light pulse width and intensity, the laser light pulse width and intensity, and the magnetic field in the information recording system circuit. combination,
Program software, IC memory and C for controlling the means selected from the three means such as the width and strength of the magnetic field
This is a recording / reproducing device that holds an information recording system circuit including an IC circuit composed of a PU.

The recording / reproducing apparatus of the present invention performs test data reproduction tracking after recording test data on a recording medium to determine the optimum recording signal and recording conditions for reproduction in the internal environment of the recording / reproducing apparatus. Optimum for preventing crosstalk by detecting from the test data and then reproducing the non-recording area by offsetting the tracking of the test data recording track or tracking the adjacent non-recording track. It is preferable to have a function of detecting a pit or a magnetic domain.

The recording / reproducing apparatus of the present invention is a means capable of manually instructing operation, a means for automatically entering a test recording system when at least one of a recording signal causing crosstalk and a recording signal which cannot be reproduced appears. ,
Means for automatically starting a reproduction tracking operation of a non-recorded track at the end of test recording, means for detecting optimum recording conditions after completion of reproduction of test recording data, execution of a recording / reproducing apparatus under the detected optimum recording conditions, etc. Means.

According to the recording / reproducing method of the present invention, in a recording medium in which the recording areas of the strip-shaped section tracks are arranged side by side, a plurality of sections having the pulse width and the intensity as variables in the first strip-shaped section unrecorded area are used. A recording step for obtaining a recording width function of the test pulse signal element data; a reproducing step for directly reproducing the area recorded in the recording step following the recording step; and an intensity of the reproduced signal obtained in the reproducing step. Detecting the optimum pulse signal element data having the smaller recording element size from the group of recording data consisting of the optimum pulse width and pulse intensity based on the pulse width; A recording / reproducing method for a recording medium, comprising an execution step of executing data of an optimum pulse width and intensity. The plurality of test pulse signal element data with the pulse width and intensity as variables,
This includes one selected from a combination of data that cannot be clearly reproduced at an ambient temperature in the recording / reproducing apparatus and data that cannot be clearly reproduced and data that causes crosstalk with a recording element on an adjacent track. The detecting step of detecting the optimum pulse signal element data having the smaller recording element size from the recording data group including the optimum pulse width and the intensity is the optimum pulse signal for substantially preventing the crosstalk. This is a detection step of detecting element data.

Another recording / reproducing method according to the present invention is directed to a recording medium in which recording areas of strip-shaped sections are used side by side.
A recording step of obtaining a recording width function of a plurality of test pulse signal data using the pulse width and the intensity as variables in the first band-shaped section unrecorded area, and recording directly in the recording step directly after the recording step A reproducing step of reproducing a second band-shaped section unrecorded area adjacent to the area, detecting the intensity of the reproduced signal obtained in the reproducing step, and selecting an optimum pulse width and intensity based on the pulse width; A calculating step of calculating an optimum pulse width and an optimum recording arrangement of the intensity data, and the optimum pulse width and the intensity;
And an execution step of executing the optimum recording arrangement of the optimum pulse width data, wherein the plurality of test pulse signal element data having the pulse width as a variable are stored in the recording / reproducing apparatus. This is a recording / reproducing method for a recording medium containing at least the former data out of data that cannot be clearly reproduced at the ambient temperature and data that causes crosstalk with an adjacent track.

Still another recording / reproducing method according to the present invention is a recording / reproducing method for a recording medium, which includes repeating the above-described series of steps in this order at regular intervals.

In the magneto-optical recording method of the present invention, a step prior to the step of performing magneto-optical recording, that is, a step until a combination of a laser light pulse width and an intensity and a combination of a magnetic field pulse width and an intensity is obtained, or a laser beam The process up to obtaining the combination of the spot intensities or the process up to obtaining the combination of the light intensity of the laser light pulse and the magnetic field intensity is performed at the start of operation of the magneto-optical recording / reproducing apparatus and the magneto-optical recording medium by the It is preferable to execute at least one of the mounting times.

The object of the present invention is not limited to the magneto-optical recording medium and the magnetic recording medium described above, but can be generally applied to any recording / reproducing method for the optical recording medium. Such repetition of the control for adjusting the laser beam output and the test recording are the same for the magneto-optical recording medium of the magnetic field modulation recording system.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION

[0043]

【Example】

Embodiment 1 FIG. 7 shows the contents of a case where the present invention is applied to a recording / reproducing apparatus system for a sample servo tracking type magneto-optical recording medium and is carried out. In order to perform tracking using the apparatus shown in FIG. 7, a disk on which wobble pits are formed in advance is used as a magneto-optical disk. The recording / reproducing apparatus system includes a laser beam irradiation unit for irradiating the magneto-optical disk 21 with pulsed light at a constant period synchronized with the code data, and a magnetic field application for applying an external magnetic field for recording to the magneto-optical disk 21. And a signal detection unit for detecting a signal from the magneto-optical disk 21. In the laser light irradiation section, the laser light source 22 is connected to a laser drive circuit 32, and the laser drive circuit 32
The laser light source 22 is controlled by receiving a clock signal described later from the circuit 39. In the magnetic field application section, the magnetic coil 29 for applying a magnetic field is connected to a magnetic coil drive circuit 34, which receives input data from the encoder 30 through the phase adjustment circuit 31, and controls the magnitude of the applied magnetic field and Controls polarity switching timing. In the signal detection section, a first polarizing prism 25 is disposed between the light source of the laser 22 and the magneto-optical disk 21, and the second polarizing prism 251 and detectors 28 and 281 are located beside the first polarizing prism 25.
Is arranged. The detectors 28 and 281 are connected to a subtractor 302 and an adder 301 via I / V converters 311 and 312, respectively. Adder 30
1 is connected to the PLL circuit 39 via the clock extraction circuit 37, and the subtractor 302 is connected to the decoder 38 via the reproduction signal detection circuit 33.

The operation system for reproducing the recorded signal is as follows. First, in the above-described apparatus configuration, the laser beam for signal reproduction emitted from the laser light source 22 is collimated by the collimator lens 23 and passes through the polarizing prism 25. Is focused on the disk 1 by the objective lens. The reflected light from the magneto-optical disk 21 is directed to the polarizing prism 251 by the polarizing prism 25, and
, And are split in two directions by a polarizing prism 251. The split light is condensed by a detection lens 27 and guided to photodetectors 28 and 281, respectively. A pit for generating a tracking error signal and a clock signal is formed on the magneto-optical disk 21 in advance. After a reflected light signal from the pit for generating a clock signal is detected by the detectors 28 and 281, a clock extraction circuit 37 is provided. Is extracted by Next, the PLL circuit 39 connected to the clock extraction circuit 37
Generates a data channel clock.

The recording operation system of the test data to be recorded in advance is such that the laser light source 22 emits a continuous pulse light having a small width so as to be synchronized with the data channel clock by the laser drive circuit 32, and the rotating magneto-optical disk 21 is rotated. The data recording area is locally heated at equal intervals. Further, the encoder 30 generates a data signal of an integral multiple of the reference clock cycle based on the data channel clock generated from the PLL circuit 39. This data signal is sent to the magnetic coil driving device 34 via the phase adjustment circuit 31. The magnetic coil driving device 34 controls the magnetic field coil 29 to apply a magnetic field of a polarity corresponding to the data signal to a laser spot irradiated portion (heated portion) of the data recording area.

The test recording data 102 shown in FIG. 7 may be test-recorded when the recording / reproducing apparatus starts driving, or the test recording data 102 may be recorded while the user information 40 is being recorded. . In a situation where test recording is required, the focus tracking error signal generation circuit 106 of the servo system generates a tracking error signal of a designated track by a microcomputer in the recording / reproducing apparatus or a test recording signal of the central information processing unit 101. Then, in synchronization with the clock signal of the clock extraction circuit 37, the tracking and the recording of the test data are started from the designated position. Test recording data cannot be reproduced by a normal user recording information tracking error signal reproducing circuit. It must be reproduced by a reproduction process dedicated to test recording data. In the present invention, as a reproduction step dedicated to test recording data, a tracking error signal generated by an I / V and focus tracking error signal generation circuit 106 is applied to a servo signal system from a user recording information tracking error signal, The switching circuit means 104 for switching to the test recording data reproduction tracking error signal or the test recording data reproduction differential tracking error signal was introduced, installed and used. After switching from the user information tracking error signal section to the test recording data reproduction tracking error signal, the tracking information is transmitted to the head actuator 103 by the tracking servo circuit 105 to control the tracking. The switching circuit 104 switches to the reproduction stage after the test data is recorded, and performs only the operation of returning to the tracking of the original test recording track when the reproduction of the test recording data is completed. The switching circuit 104 can be introduced by switching the tracking servo signal between test recording and user information by using the circuit shown by 110 in FIG. 5, the switching circuit means S5, and the circuit shown by 100 in FIG. Switching circuit means S1, S2, S3, S4 may be used.

FIG. 6 is a recording surface diagram of the magneto-optical recording medium 21 of the sample servo system. The track portion of the recording surface is composed of land sections L1, L2, L3, and the like.
a, Wb, Wc, Wd, etc., wobbling pit, C
Clock pits such as a and Cb were formed, and the test recording data magnetic domain was recorded by the test recording spot on the track L2. After the recording, the reproducing head was subjected to the reproducing operation by performing tracking offset to the test recording data reproducing spot position by the tracking error signal.

For the first time, the size of a pit or a magnetic domain in which no crosstalk occurs, the pulse width and intensity of a laser beam for forming the pit or the magnetic domain, and the data obtained by the data reproduced in the reproducing process dedicated to the test recording data. The strength of the magnetic field can be determined. As a result of the reproduction, the appropriate recording magnetic domains were P2 and P3. In the recording magnetic domain, P1 was a magnetic domain of a size that could not be clearly reproduced.

Embodiment 2 When the magneto-optical recording medium is inserted into the recording / reproducing apparatus while the temperature, humidity, atmospheric pressure, etc. in the recording / reproducing apparatus are still in the room environment when the power is input, the test recording access is performed. Begins. However, the temperature in the recording / reproducing apparatus to which the power has been input rises with time. Further, when the test recording and its reproduction, user recording, and the like are accessed, the temperature inside the recording / reproducing apparatus is accelerated, but the temperature environment inside the recording / reproducing apparatus eventually reaches the equilibrium temperature. The temperature curves starting from the room temperature E in FIG. 1 and FIG. 2 are examples of a temporal change in the temperature inside the recording / reproducing apparatus starting from the room temperature. The cryogenic environment temperature D in FIGS. 1 and 2 is a temporal change in the temperature inside the recording / reproducing apparatus when the recording / reproducing apparatus is started from the power input in the cryogenic environment (−20 ° C.). As shown in FIG. 1, the recording magnetic domain recorded on the magneto-optical recording medium when test recording is not performed has a temperature of (1) in the temperature curves 1 and 3 in the recording / reproducing apparatus and the temperature curves 2 and 4 of the recording medium. ), (2), (3), (4)
In each case, the recording domain a, such as 5, 6, 7, 8
The sizes are b, c, and d. Starting from the environmental temperature D, a of the recording magnetic domain 6 where the temperature in the recording / reproducing apparatus is the temperature (1) at the time of the start is a size that cannot be reproduced. Further, d of the recording magnetic domain 7 whose temperature in the recording / reproducing apparatus is (4), which is started from the environmental temperature E, is a magnetic domain in which crosstalk occurs.

In a high-humidity environment in a room in which the recording / reproducing apparatus is placed, problems such as a change in the optical properties of the transparent substrate of the optical disk and a decrease in the rate of temperature rise of the recording film during laser irradiation occur.

The recording / reproduction incorporating the control circuit of the present invention, in which the test recording is repeatedly performed in the course of the temporal change of the temperature in the recording / reproduction device, and the correction control is performed to the optimum laser light pulse width and intensity and the magnetic field intensity each time. FIG. 2 shows a case where the method using the apparatus is performed. That is, the temperature curves 1 and 3 in the recording and reproducing apparatus and the temperature curves 2 and 4 of the recording medium.
At the temperatures (1), (2), (3), and (4) in FIG. 2, the user information can be recorded in the recording magnetic domain of the optimal condition indicated by a in each of 16, 17, 18, and 19, respectively. Was.

The above test record was recorded on the narrow groove 77 (see G1 to G4) and the land 75 of the V-shaped groove shown in FIG.
Using a medium composed of L1 to L3, the test recording data reproduction tracking switching circuit 104 and test recording reproduction tracking error signal circuit of the present invention shown in the recording and reproduction apparatus of FIG. This is a result obtained by incorporating a circuit. The spot of the irradiation laser beam pulse has a size covering the entire width of the land L1 as shown in FIG. 3, but the spot of the land 75 of the magneto-optical recording medium of FIG.
The magnetic domain recorded in No. 2 corresponds to the recording magnetic domain 11 in FIG. As shown in FIG. 3, in the laser beam pulse temperature distribution curve 12 of the laser beam pulse irradiation spot 10, the distribution in which the temperature of the land L1 reached the magnetic domain formation temperature 13 was equivalent to the width of the recording magnetic domain 11. It is shown that. In FIG. 3, the tracking for reproducing the test recording data magnetic domain 11 is performed by tracking the G2 of the narrow groove 77 or the G1 of the narrow groove 77 of the non-recorded V-shaped groove in FIG. In order to track G2 or G1 of the non-recording narrow groove 77 in FIG. 3, the reproducing head uses the tracking error signal shown in FIG. Alternatively, tracking switching control must be specially provided so as to track G1. This tracking control is performed as shown in FIG.
This was obtained for the first time by incorporating the circuit shown in FIG.

Further, the reflected light amount of the laser beam spot irradiated for tracking the non-recording narrow groove of the V-shaped groove 77 shown in FIGS. 3 and 16 is lower than that for tracking the land. Accordingly, based on the amount of tracking reflection light when test recording is performed on L1 of the land 75 in FIG. 3 or when test recording is performed on L2 of the land 75 in FIG. 16, non-recording of the V-shaped groove 77 is performed to reproduce test recording data. A narrow groove, G2 or G1 in FIG. 3,
Alternatively, it is necessary to use a control circuit for correcting the tracking reflected light amount that decreases when switching to the tracking of G2 or G3 in FIG. That is, a circuit for correcting the amount of reflected light reduced by the peak hold as shown by 57 in FIG. 22 is connected before the tracking error signal circuit, and the non-recording width of the V-shaped groove 77 for reproducing test recording data is reduced. When the tracking is switched to the tracking of the groove G2 or G1, the peak hold is operated for the tracking, and the reproduction tracking of the test recording data 71 is performed.

The test recording data 71 of the magneto-optical disk shown in FIG. 16 was performed on G2 of the narrow V-shaped track 77 where the erroneously recorded magnetic domain z exists. As a result of reproducing the data of the test recording performed under such conditions under the above conditions, b was detected as a magnetic domain under the optimum conditions. In the reproduction tracking in G3, b and c were detected as magnetic domains under the optimum conditions. The magnetic domain a was a magnetic domain that was difficult to reproduce. From the viewpoint of reproducibility and prevention of crosstalk, the magnetic domain b is preferable.

Embodiment 3 FIG. 10 shows a magneto-optical disk recording medium in which narrow groove portions 77 (see G1 to G4) and land portions 75 (L1 to L3) form concentric tracks. Although the recording magnetic domain is of a three-month type, this type of recording magnetic domain has a feature that high-density recording can be performed. The test recording data 71 was recorded in the L2 of the track 77 where the user information was recorded, in an unrecorded area on the extension of the user recorded information, or in a non-recorded area after the user recorded information was erased. This test recording 71 is caused by the fact that the temperature inside the recording / reproducing device has risen,
4, the automatic test recording system of the recording / reproducing apparatus operates, and the test recording data 7
1 is recorded. The test recording data 71 is reproduced by tracking the non-recording narrow groove G3 of the V-shaped groove 77 in FIG. 10, but the reflection of the laser beam spot irradiating the non-recording narrow groove G3 of the V-shaped groove 77 is obtained. The light amount is lower than when tracking the land. Therefore, using the recording / reproducing apparatus equipped with the tracking error signal control circuit of the servo system shown in FIG. 22, the test recording data 71 is reproduced from the tracking reflected light amount at the time of test recording at L2 of the land 75. When the tracking was switched to the non-recording narrow groove G3 of the V-shaped concave groove 77, the control circuit 57 for correcting the amount of reflected light reduced by the amount of tracking reflected light was operated to perform reproduction tracking. That is, when the tracking is switched to the non-recording narrow groove G3 of the V-shaped groove 77 for reproducing the test recording data 71, the peak hold 57 is operated for the tracking, and the reproduction tracking of the test recording data 71 is performed. The test recording data 71 was reproduced by the tracking of G3, and the width and intensity of the laser light pulse for forming the recording magnetic domain c and the magnetic field intensity were detected as the optimum conditions. Incidentally, the test record 71 can be directly overwritten on the user record information 74 of the magneto-optical recording medium of FIG. In this case, it is possible to provide a microcomputer and software for operating a function capable of accurately recognizing and determining a range of information that can be erased in advance and a function of not remaining unerased.

Embodiment 4 FIG. 14 shows a write-once optical recording medium composed of narrow groove portions 77 (see G1 to G4) and land portions 75 (L1 to L3). The test record data 71 is a hole-pit type pit. The test recording is recorded in an unspecified test recording area specified in the recording track 75. The conditions under which test recording is activated are limited because recorded data cannot be erased, and holes are recorded in the recording film. The recording / reproducing device detects the internal temperature, and when a specified temperature environment is reached, the test recording is activated and the test data 7 is output.
1 is recorded and a control circuit for recording and reproducing test data to detect the output of the optimum recording laser spot or the width and intensity of the laser beam pulse spot in reproducing the test data 71. Not I
A C memory CPU circuit and program software necessary for the operation of the functions are provided.

FIG. 14 shows an embodiment in which the test data 71 is test-recorded in L2 of the designated unrecorded track 75 of the optical disk on which the spiral recording track 75 is formed. This test recording is an embodiment in which the use must be started in a recording / reproducing apparatus having an abnormally low environmental temperature, and therefore, is an embodiment for detecting an optimum recording condition of a reproducible recording pit. In the reproduction tracking of the test recording data 71, first, the test data is reproduced by tracking the L2 of the test recording track 75, and the power intensity and the spot width of the recording laser beam spot optimum for the record pit recording that can be reproduced are detected. The G3 of the narrow groove 77 was tracked by the tracking error signal, and the optimum recording pit recording condition for preventing the crosstalk was detected. As a result, pit b was detected as the optimum condition.

Embodiment 5 FIGS. 9 and 15 show a case of an optical disc in which both the land 75 and the groove 76 can be used as recording tracks.

FIG. 9 shows the pulse width and intensity of an optical pulse for forming a recording pit by irradiating a laser beam spot on L1 of the land portion 75 of the optical recording medium and heating it to a pit formation temperature. The test recording data 71 is test-recorded, and then the tracking offset is made to L1 / G2 which is the boundary between L1 of the adjacent land 75 and G2 of the wide groove 76, or G2 of the wide groove 76
FIG. 9 is a cross-sectional view of an embodiment in a case where test data 71 is reproduced by tracking data.

The optical head 14 of the recording / reproducing apparatus automatically shifts from the test recording tracking operation to the reproduction tracking operation. At this time, the non-recording boundary L1 / G2 between L1 of the land 75 and G2 of the wide groove 76. FIG. 9 shows the differential tracking error signal necessary for tracking the error. The read head tracks G2 of the wide groove 76 where no recording is performed, and the test recording data 71
Is reproduced by transmitting the normal tracking error signal shown in FIG.

In this embodiment, in particular, the boundary L1 /
A differential tracking error signal circuit 56 and a tracking error signal as shown in FIG. 21 are provided in the recording / reproducing apparatus so that both the G2 test data reproduction tracking and the G2 test data reproduction tracking of the unrecorded wide groove 76 can be performed. A recording / reproducing apparatus equipped with both circuits 55 was used.

In order for the reproducing head to track the non-recording boundary L1 / G2 between the land L1 and the wide groove G2 in accordance with the differential tracking error signal, the tracking error signal differentiating circuits 51 and 52 shown in FIG. 8 or FIG.
In the I / V focus tracking error signal generation circuit, and further switches from the tracking of the user information to the reproduction tracking error signal of the test recording and the reproduction differential tracking error signal.
Is implemented.

To reproduce the test data 71 by tracking the tracks of the unrecorded wide groove 76 by the ordinary tracking error signal, the control circuit 10 shown in FIG.
0 or the control circuit 110 shown in FIG. In order to track the wide groove portion 76, the polarities of the signals from the two photodetectors that generate the tracking error signal may be exchanged. Since the amount of leakage into the adjacent track (land portion) can be determined from the intensity of the magneto-optical reproduction signal, a level that does not affect the adjacent track is set as a slice level, and a reproduction signal that does not exceed the level is used. The laser pulse width can be set to the optimum recording laser light pulse width.

As an embodiment of the recording / reproducing apparatus for performing the test recording and the reproduction of the test recording data 71, it is possible to detect a situation that the operation can be manually instructed, a crosstalk signal appears, or the recorded signal cannot be reproduced. At that point, automatically enter the test recording system, at the end of the test recording, automatically determine the non-recording playback tracking track, start the playback tracking operation, after detecting the playback signal, Detecting laser beam spot power intensity, laser pulse width and intensity, or magnetic field width, intensity, etc. and optimum conditions for recording, which can prevent crosstalk or perform clear recording. The recording / reproducing device operates the optimum value of the beam spot intensity, laser pulse width, intensity, or magnetic field width, intensity, etc. Sea urchin settings, control,
Those having the functions of the steps such as executing were implemented.

The test recording is performed by a recording / reproducing apparatus incorporating a tracking error signal differentiating circuit 51 shown in FIG. 8 and 52 shown in FIG. 12 and a wide groove 76 (see G1 to G2) composed of concentric tracks shown in FIG. ) And a land 75 (see L1). In the magneto-optical recording medium of FIG. 15, the user information 74 is recorded in advance, and the recording of the user information 74 cannot be reproduced during the recording. The test recording is started in L1 of the land 75 of the recording track.

The magnetic domain of the recorded test recording data 71 is a portion where the spot of the irradiated laser beam reaches the magnetic domain forming temperature 13 during the irradiation with the size covering the entire width of the land 75 as shown in FIG. And corresponds to a recording magnetic domain having a width indicated by 11 in FIG. In the recording / reproducing apparatus according to the present embodiment, when a state in which the recorded user information 74 cannot be read occurs, first, an optimum recording condition of a readable recording element or a recording magnetic domain is detected from the test recording data 71. IC that does not describe the program software of the recording / reproducing device
A memory stored in the memory CPU circuit is used, or a medium on which the program software is recorded is used.

The test record data 71 in FIG.
It consists of c, d, e, and f. L of test recording track 75
Defect z was present in recording film No. 1. When the defect z was near the magnetic domain e of the test record data, L1 of the test data recording track 75 was tracked to detect a recordable magnetic domain. As a result, b, c, d, e,
f was reproducible and a was not reproducible. Next, the tracking error signal differentiating circuits 51 and 52 of the recording / reproducing apparatus use the L1 which is the non-recording boundary between the wide groove and the land.
/ G2 and L1 / G1, which is a non-recording boundary, were tracked, test recording data was reproduced, and the optimum recording condition of the recording magnetic domain was detected. As a result, b, c, and d were detected, and e and f were inappropriate.

The test record data 71, a, b, c,
d, e, and f were erased and retest recording was performed. In the re-test recording, the defect was located in the vicinity of the magnetic domain c. As described above, the non-recording boundary L1 / G2 and the non-recording boundary L1 / G1 were tracked, and the test recording data was reproduced. The recording condition of the recording magnetic domain was detected. As a result, at the non-recording boundary L1 / G1, b is detected and c and d are detected.
Was not detected. Untested track 7 for retest recording
As a result of tracking G2 of No. 6 and reproducing, b, c, and d were detected as the optimum recording magnetic domain recording conditions. From the above, it is preferable to select a place where there is no defect or the like on the recording film for a blank track on which test recording is performed. That is, a recording / reproducing apparatus equipped with a function of performing test recording and reproduction detects a defect or a portion remaining after erroneous writing on a recording film at the time of test recording, and detects a track having no such defect or remaining portion after erroneous writing. It is preferable to have a function of selectively performing test recording.

In the case of using a recording / reproducing apparatus in which test recording cannot be performed while avoiding a defect of the recording film or a track on which erroneous writing remains, for example, in the test recording of FIG. Tracking of a plurality of non-recording tracks at least at two or more locations selected from the non-recording boundary L1 / G1, the non-recording boundary L1 / G2, the G2 of the non-recording track 76, and the like. It is preferable to detect the optimum recording condition.

Sixth Embodiment FIG. 11 is a diagram of a type including a wide groove 76 (see G1 and G2) and a land 75 (see L1 and L2), and recording user information 74 in both the wide groove 76 and the land 75. It is a magneto-optical recording medium. The recording magnetic domain has a crescent shape, and has a feature that information elements can be recorded at a high density. In the test recording of this embodiment, the test recording data 71 is recorded on the G1 track and L1 track of the wide groove 76 on which the user information 74 is recorded, and on the L1 track following the user information 74.
This is an example in which is recorded. In this test recording, since the temperature inside the recording / reproducing device increased during the user recording, crosstalk occurred between the recording tracks of the user information. This is the result of the test recording function being automatically activated and the test data 71 recorded. In the test recording data 71, the width, intensity and magnetic field intensity of the laser light pulse which forms the recording magnetic domain b by tracking and reproducing the boundary of L1 / G2 were detected as the optimum conditions. The test recording data 71 was reproduced by manually tracking G2 of the wide groove 76. In order to track the wide groove portion 76, the polarities of the signals from the two photodetectors that generate the tracking error signal may be exchanged. Since the amount of leakage into the adjacent track (land portion) can be determined from the intensity of the magneto-optical reproduction signal, a level that does not affect the adjacent track is set as a slice level, and a reproduction signal that does not exceed the level is used. The laser pulse width can be set to the optimum recording laser light pulse width. The wide groove 76 could be reproduced by tracking G2.

The track of the magneto-optical recording medium of FIG.
Unlike the magneto-optical recording medium No. 5 (concentric track), it is a spiral track. In this type of track, it is necessary to repeat the reproduction of the test recording data 71 by returning to the previous track in the first rotation for each tracking of the test data reproduction.

Embodiment 7 FIG. 13 shows a spiral wide groove 76 (see G1 to G4).
And a land 75 (L1 to L3). The user information 74 is recorded in both the wide groove 76 and the land 75. The test record data 71 is a hole-pit type pit. In this embodiment, test recording was performed because crosstalk occurred during user recording. The test record is recorded on a designated test recording-dedicated track. The conditions under which test recording is activated are limited because recorded data cannot be erased, and holes are recorded in the recording film. The internal temperature is detected in the recording / reproducing apparatus, and when a specified temperature environment is reached, test recording is activated and test data 71 is recorded.
In order to automatically detect the output of the recording laser spot or the width and intensity of the laser beam pulse spot in the reproduction of 1, the control circuit for recording and reproducing the test data, an IC memory CPU not described Equip the program necessary for the operation of the circuits and functions.

After the test data 71 is test-recorded on G1 of the designated unrecorded track 76 of the optical disk on which the spiral recording track is formed as shown in FIG.
First, the reproduction tracking of the test recording track 76
The test data 71 is reproduced by tracking G1 of
The power intensity and spot width of the recording laser beam spot optimum for recording pit recording that can be reproduced are detected, and then the boundary G1 / L2 between G3 of the groove 76 and L2 of the land 75 is tracked by a tracking error signal,
The optimal recording pit recording conditions for preventing crosstalk were detected. As a result, pit b was detected as the optimum condition.

Eighth Embodiment FIG. 17 shows that the entire recording area tracks 78 and 79 are concentrically formed with slightly inclined surfaces, and the recording / reproducing tracks are partitioned by boundaries between the inclined surfaces in the radial direction. 4 shows a changeable optical disk. The information recording element is recorded and formed on the inclined surface of the groove. The recording / reproducing apparatus used was equipped with a circuit for generating a tracking error signal for a non-recorded track when reproducing the test recording data 71. FIG. 17 shows S, S5 of tracks 78 and 79, and h,
Although the user record information pit 74 (black circle) indicated by g has already been recorded, test data recording is required, and according to the operation of the tracking error signal specified in advance, the program skips over S7 of the unrecorded track 79 and returns to the unrecorded track 79. At S8 of 78, the signal pits a,
b, c, d, and e are recorded. The signal data pit d of the test data overlaps the defect z of the recording film. Each time test data 71 was recorded, a data signal was reproduced, and test recording and reproduction were performed by a method of detecting a laser pulse signal width and intensity of an optimum pit for preventing crosstalk. Non-recording boundary S8 / S9 between S8 of track 78 and S9 of track 79, S7 of track 79 and track 7
S8 / S8, non-recording boundary S7 / S8, non-recording track 7
With respect to a plurality of non-recording tracks such as S7 of No. 9 and S9 of the non-recording track 79, the tracking of the reproducing head was successively performed a plurality of times, and the test recording was reproduced. The optimum recording pid was c.

FIG. 18 shows a test record when test data recording is required. The pits in which user information pits 74 (black circles) have already been recorded are erased from the pits in which an error has occurred. This is an embodiment in which recording is performed in accordance with an operation of a preset tracking error signal so that test recording is started from a recorded user information recording track. The reproduction of the signal pits a, b, c, and d of the test data 71 indicated by white circles in S8 of the unrecorded track 78 was performed by tracking the boundary of S8 / S9 by the tracking offset. The track S9 can be tracked and reproduced.

Embodiment 9 FIG. 20 shows magnetic domains in which a, b, c, d, and e of test recording data 71 are recorded on L2 of a strip track 75 of a magnetic recording medium. The recording magnetic domain is accompanied by a recording which is considerably deviated from the tracking center, a recording runout, or an occurrence of error noise. However, the tracking error signal control circuit system causes the unrecorded track from L2 of the recording track 75 to move. 75 L3 or L1 of the unrecorded track 75 is tracked and reproduced to prevent crosstalk, and the size of a magnetic domain capable of high-density recording;
Alternatively, the optimum conditions of the recording magnetic field width and intensity were detected.

In this embodiment, the L1 to L4 of the land track 75 where the emboss pits 81 necessary for tracking are formed.
This is an embodiment relating to the magnetic recording medium shown in FIG. 20 and a magnetic recording / reproducing apparatus system, which are constituted by G1 to G4 of a V-shaped groove groove 77 in which a magnetic domain signal is recorded at the boundary between L3 and the land 75. The test recording is an example in which the magnetic domain as the user information pit 74 is recorded on L2 of the track 75 adjacent to L1 of the 75th track. The recording magnetic domain must prevent the generation of magnetic domains (d) and (e) that make contact with the V-shaped groove groove 77 of the track boundary signal. Therefore, the optimum condition is detected based on not only the size of the magnetic domain but also the relationship between the minimum limit of the variation of the recording position of the magnetic domain, the size of the magnetic domain, and the environmental temperature. Recording of test data 71 of this embodiment, test record data 7
1 and the tracking of the recording / reproducing track are performed by a magnetic head. The test recording data 71 is reproduced while reading the tracking magnetic domain signal recorded in the V-shaped groove 77, and the optimum magnetic domain and the recording condition of the magnetic domain are detected.

The reproduction of the test record data 71 is performed on the land 75.
L3 can be obtained by tracking, and the magnetic domain under the optimum condition and the recording condition of the magnetic domain can be detected.

Embodiment 10 FIG. 19 shows a magneto-optical recording medium in which a recording area is composed of land portions 75 (see L1 to L3) and narrow groove portions 80 (see G1 to G4). The narrow groove portion 80 has an inverted V-shaped convex shape. In FIG. 19, the user information 74 is recorded in L1 of the concave land 75 of the magneto-optical recording medium, and a, b, c, and d of the test recording data 71 are recorded in L2 of the concave land 75 adjacent to G2 of the narrow groove 80. Is recorded. In the test recording data 71, the data a is a magnetic domain that is difficult to be reproduced by the reproducing head of the recording and reproducing apparatus used in the present embodiment, and the test recording data e is the magnetic domain in the reproducing head of the recording and reproducing apparatus of the present embodiment. This is a magnetic domain where crosstalk is expected to occur. First, the reproducing head is set to L
When the test recording data 71 was reproduced by tracking No. 2, the test recording magnetic domain a could not be reproduced. In the test recording magnetic domain e, a crosstalk error occurred. Next, the L of the track 75 on which the user information pit 74 is recorded
As a result of tracking and reproducing the G2 of the narrow groove portion 80 having a convex shape formed between L1 of the track 75 of the test recording data 71 and the reproduction by the reproducing head, the test magnetic domain under the optimum recording condition is b. Was. Further, when G3 of the convex narrow groove portion 80 was tracked by the reproducing head, the test magnetic domains under the optimum recording conditions were b and c.
Other conditions of the present embodiment are the same as those of the second embodiment.

Based on the above embodiment, in the present invention, test recording is performed before user data recording, and the test recording signal 71 is reproduced by shifting the tracking center as described above, and test recording data is reproduced. Test recording is performed by making full use of the test recording / reproduction control system until the user determines a range of reproducible data and determines an optimum recording condition for information to be recorded by the user. Further, the obtained optimum recording condition is transmitted as a control signal to a drive connected to the laser controller, and recording and reproduction of the user data is performed under the optimum recording condition. The laser beam pulse width and the laser beam intensity thus obtained are the optimum laser beam irradiation conditions for recording on the optical recording medium. By recording information under the laser irradiation conditions optimized in this way, it is possible to perform recording with little leakage into an adjacent recording track.

The test recording can be performed at any time before the user information is recorded. For example, when the operation of the magneto-optical disk drive starts or when the magneto-optical disk is mounted on the apparatus. May be recorded in the above-mentioned area, or may be recorded at regular time intervals.

Although the present invention has been described in detail with reference to the embodiments of the magneto-optical recording / reproducing method, the present invention is not limited to these embodiments, and both the laser pulse width and the light intensity can be simultaneously optimized. It may be.

[0083]

According to the recording / reproducing method of the disk recording medium of the present invention, the test recording data recording track is first recorded and then the test recording data recording track is reproduced and tracked. A method executed only by attaching a switching circuit for switching a tracking error signal or a differential tracking error signal to a recording / reproducing apparatus in order to perform reproduction tracking by designating a non-recording area near a recording data recording track. It is. The recording / reproducing apparatus of the present invention is used under environmental conditions where the recording / reproducing apparatus is placed, particularly under temperature conditions.
In order to perform recording without crosstalk, which is possible to reproduce, optimal conditions such as power intensity of recording laser light, pulse width and intensity of laser light, width and intensity of magnetic field, etc. are automatically obtained, and this optimization is performed. The high-density recording can be automatically executed by taking in the laser irradiation conditions. As described above, the reliability of the optical recording / reproducing apparatus can be improved by using the recording / reproducing apparatus and the recording / reproducing method of the present invention which can be used immediately and immediately in the external environment.

[Brief description of the drawings]

FIG. 1 is a correlation diagram between a temperature and a recording pit of a conventional recording / reproducing apparatus.

FIG. 2 is a correlation diagram between the temperature and the recording pit of the recording / reproducing apparatus of the present invention.

FIG. 3 is an embodiment of a test recording data position and a tracking error signal by laser light irradiation according to the present invention.

FIG. 4 is a circuit diagram for switching a reproduction tracking error signal of a test recording signal according to the present invention.

FIG. 5 is a circuit diagram for switching a reproduction tracking error signal of a test recording signal according to the present invention.

FIG. 6 is a diagram showing tracks, test recording data, and tracking spots in a wobbling pit format according to the present invention.

FIG. 7 is a configuration diagram of an optical magnetic field modulation type recording / reproducing apparatus used in an embodiment of the present invention.

FIG. 8 is a diagram showing an embodiment of a circuit for switching a differential tracking error signal for reproducing test recording data according to the present invention.

FIG. 9 is a conceptual diagram of an embodiment of a test recording data position and a differential tracking error signal by laser light irradiation according to the present invention.

FIG. 10 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 11 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 12 is an embodiment of a differential tracking error signal switching circuit for reproducing test recording data according to the present invention.

FIG. 13 is a conceptual diagram showing an embodiment of the relationship between test recording data and tracking tracks according to the present invention.

FIG. 14 is a conceptual diagram showing an embodiment of the relationship between test recording data and tracking tracks according to the present invention.

FIG. 15 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 16 is a conceptual diagram showing an embodiment of the relationship between test recording data and tracking tracks according to the present invention.

FIG. 17 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 18 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 19 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 20 is a conceptual diagram showing an embodiment of the relationship between user information recording, test recording data, and tracking tracks according to the present invention.

FIG. 21 is a diagram showing an embodiment of a tracking error signal switching circuit and a differential tracking error signal switching circuit for reproducing test recording data according to the present invention.

FIG. 22 is a diagram illustrating an embodiment of a peak hold circuit for reproducing test recording data and a switching circuit for switching to a tracking error signal circuit according to the present invention.

[Explanation of symbols]

 Reference Signs List 11 recording axis 15 laser beam 21 recording medium 25, 251 polarizing prism 28 photodetector 31 phase adjustment circuit 34 magnetic coil drive circuit 37 clock extraction circuit 38 decoder 39 PLL circuit 43 user recording information tracking error signal circuit 51, 52 differential tracking Error signal switching circuit 57 Peak hold control circuit 71 Test recording data 73 Test recording data reproducing spot 74 User information pit 75 Recording medium land section 76 Recording medium wide groove section 77 Recording medium narrow groove section 100, 110 Tracking error signal switching circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sho Imai 1-1-88 Ushitora, Ibaraki City, Osaka Prefecture Inside Hitachi Maxell Co., Ltd. (72) Inventor Norio Ota 1-188 Ushitora, Ibaraki City, Osaka Hitachi Maxell, Inc.

Claims (25)

[Claims] 1. A control circuit for recording a test data on a recording medium, transmitting an error signal of a non-recording track necessary for reproducing the test data, and tracking a reproduction head. Recording and playback device. 2. The data according to claim 1, wherein the test data is at least one of data that cannot be clearly reproduced by a reproducing head at an environmental temperature in the recording / reproducing apparatus and data that causes crosstalk with a recording information element of an adjacent track. A recording / reproducing apparatus characterized by including: 3. A pulse signal recording method according to claim 2, wherein the test data is recorded on at least one selected from a pulse width and intensity of a laser beam and a magnetic field width and intensity while changing values such as a pulse width and an intensity. A recording / reproducing apparatus characterized by being data. 4. A recording / reproducing apparatus comprising: a control circuit for transmitting a tracking error signal for a necessary tracking offset after recording test data and holding a control circuit for performing a tracking offset of a reproducing operation head. 5. The test data according to claim 4, wherein the test data is at least one of data that cannot be clearly reproduced by a reproducing head at an environmental temperature in the recording / reproducing apparatus and data that causes crosstalk with a recording information element of an adjacent track. A recording / reproducing apparatus characterized by including: 6. The test data according to claim 5, wherein the test data includes a plurality of pulse signals appearing each time the values of the pulse width and the intensity are changed for at least one selected from the laser light pulse width and the intensity and the magnetic field width and the intensity. A recording / reproducing apparatus, which is data of a recording element. 7. The recording / reproducing apparatus according to claim 1, wherein the reproducing operation head detects an optimum recording signal condition for reproducing the test recording data and preventing crosstalk. 8. The recording / reproducing apparatus according to claim 1, wherein the test data is continuously recorded on the user record information. 9. The recording / reproducing apparatus according to claim 1, wherein the test data is recorded while skipping at least one unrecorded track. 10. The recording / reproducing apparatus according to claim 1, wherein the test data is recorded on a track which is continuous with the user record information and from which the user record information has been erased. 11. The recording / reproducing apparatus according to claim 1, wherein a track tracked by the reproducing operation head is a non-recording land or groove adjacent to a user recording track and a test data recording track. . 12. A control circuit for reproducing a necessary track after recording test data and detecting a recording signal and a recording condition optimum for reproduction at the environmental temperature in the recording / reproducing apparatus from the test data. A recording / reproducing apparatus characterized by holding an information recording system circuit. 13. The recording element according to claim 12, wherein the size of the recording element in the plurality of optimum recording data detected from at least one of the test data selected from the pulse width and intensity of the laser beam and the magnetic field width and intensity is determined. A recording / reproducing apparatus, which has an optimum pulse width and pulse intensity for smaller data. 14. The recording / reproducing apparatus according to claim 13, wherein the data of the smaller recording element in the optimum recording data has a function of substantially preventing crosstalk. 15. A recording signal and recording condition according to claim 12, wherein the recording signal and the recording condition are selected from three means such as a laser light pulse width and intensity, a combination of a laser light pulse width and intensity and a magnetic field, and a magnetic field width and intensity. A recording / reproducing apparatus, characterized in that: 16. A recording / reproducing apparatus for detecting an environmental temperature in the vicinity of a recording medium surface, and holding data, a memory, and detecting means for detecting an optimum recording signal and a recording condition for the environmental temperature. Recording / reproducing apparatus characterized by the above-mentioned. 17. A laser beam pulse width and intensity, a laser beam pulse width and intensity, and a magnetic field in an information recording circuit upon detection of a recording signal and a recording condition optimum for an environmental temperature. And a software functioning to control means selected from three means such as a combination of a magnetic field width and intensity, and an information recording system circuit including a memory and an IC circuit. 18. A necessary track is reproduced after recording test data, a recording signal and a recording condition optimum for reproduction are detected from the test data, and an error signal of a next necessary non-recording track is detected. A recording / reproducing apparatus, comprising: a control circuit for transmitting a signal and causing a reproducing operation head to perform tracking for detecting optimum recording conditions for preventing crosstalk from test data. 19. A necessary track is reproduced after recording test data, a recording signal optimum for reproduction and recording conditions are detected from the test data, and a tracking error for a next necessary tracking offset is detected. A recording / reproducing apparatus, comprising: a control circuit for transmitting a signal and causing a reproducing operation head to perform tracking offset for detecting optimum recording conditions for preventing crosstalk from test data from test data. 20. In a recording / reproducing apparatus for a disk recording medium, means for manually instructing operation, test recording is automatically performed when at least one of a recording signal causing crosstalk and a recording signal which cannot be reproduced appears. Means for entering the system, means for automatically starting the reproduction tracking operation of the non-recorded track at the end of the test recording, means for detecting the optimum recording condition after the reproduction of the test recording data, and for the recording / reproducing apparatus with the detected optimum recording condition. A recording / reproducing apparatus characterized by having functions such as execution. 21. In a recording medium in which recording areas of a band-shaped section are used side by side, a plurality of test pulse signal element data having a pulse width and an intensity as variables are provided in a first band-shaped section unrecorded area. A recording step for obtaining a recording width function, a reproducing step for directly reproducing the area recorded in the recording step directly following the recording step, and detecting the intensity of the reproduced signal obtained in the reproducing step, and setting the pulse width to A detection step of detecting the optimum pulse signal element data having the smaller recording element size from a group of recording data having the optimum pulse width and intensity based on the basis, and executing the data of the optimum pulse width and intensity. And a recording / reproducing method for a recording medium. 22. The method according to claim 21, wherein the plurality of test pulse signal element data having the pulse width and the intensity as variables include data that cannot be clearly reproduced at ambient temperature in the recording / reproducing apparatus and data that cannot be clearly reproduced. A recording / reproducing method for a recording medium, comprising one selected from a combination with data causing crosstalk with respect to a recording element on an adjacent track. 23. In a recording medium in which recording areas of a band-shaped section are used side by side, a plurality of test pulse signal element data having a pulse width and an intensity as variables are used in a first band-shaped section unrecorded area. A recording step for obtaining a recording width function, a reproducing step for directly reproducing the second band-shaped section unrecorded area adjacent to the area recorded in the recording step directly after the recording step, Calculating the optimum pulse width and intensity based on the recording pulse width and calculating the optimum recording arrangement of the recording elements, and the optimum pulse width and intensity, and the optimum recording of data. In the recording / reproducing method for the recording medium, comprising the steps of executing the arranging and performing the steps of: A recording / reproducing method for a recording medium, characterized by including one selected from a combination with data that causes a stoke. 24. In a recording medium in which recording areas of a band-shaped section are used side by side, a plurality of test pulse signal element data having a pulse width and an intensity as variables are used in a first band-shaped section unrecorded area. A recording step for obtaining a recording width function, a reproducing step for directly reproducing the area recorded in the recording step directly following the recording step, and detecting the intensity of the reproduced signal obtained in the reproducing step to change the pulse width. A calculation step of calculating optimum recording data of an optimum pulse width and intensity based on the basis, and a second band-shaped section unrecorded area adjacent to the area recorded in the recording step is reproduced after the recording step. A reproducing step of detecting the intensity of the reproduced signal obtained in the reproducing step, and calculating an optimal recording arrangement of recording elements having an optimum pulse width and intensity based on the pulse width; Optimal recording arrangement of pulse width and intensity recording elements Performing a step of executing the recording and reproducing method of the recording medium, the plurality of test pulse signal element data with the pulse width as a variable, data that can not be clearly reproduced at ambient temperature in the recording and reproducing apparatus,
A recording / reproducing method for a recording medium, characterized by including one selected from a combination of data that cannot be clearly reproduced and data that causes crosstalk with a recording element on an adjacent track. 25. The detecting step according to claim 21, wherein the detecting step of detecting the optimum pulse signal element data having the smaller size of the recording element from the group of the recording data having the optimum pulse width and the intensity is substantially performed by a cross-over method. A recording / reproducing method for a recording medium, which is a detection step of detecting optimum pulse signal element data for preventing talk.