JP2003123202A - Method for manufacturing magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a magnetic recording and reproducing device provided with a preformatted recording magnetized pattern capable of maximally brings out target performance in accordance with the use, such as a servo signal for tracking, an address information signal and a clock signal. SOLUTION: Preformatted information including at least a servo signal for tracking is preliminarily recorded on a magnetic disk to be mounted on the magnetic recording and reproducing device. In magnetized bit patterns corresponding to the preformatted information is recorded by bringing a master information carrier into contact with the surface of a magnetic disk, in which similar patterns are formed with the recessed and projecting shape of a surface, and at least a projecting surface of the recessed and projecting surface is made of a ferromagnetic material. In this case, a recording width in the radial direction (e.g. track width direction) of the part of the magnetic disk which corresponds to an address signal for tracking in a preformatted signal is set smaller than the recording track width 5 of a magnetic head 1.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method of manufacturing a magnetic recording / reproducing apparatus capable of storing a quantity.
You. 2. Description of the Related Art At present, magnetic recording / reproducing devices are small and
In order to achieve large capacity, the trend toward higher recording density
is there. Hard disk, a typical magnetic recording / reproducing device
In the field of drives, areal recording density is already 1Gb
it / in ^Two Devices have been commercialized and a few years later
Has an areal recording density of 10 Gbit / in ^Two Practical use of equipment
There is a rapid technological advancement that would be discussed. [0003] Techniques that have made it possible to achieve such a high recording density
Technical factors include magnetic recording media and head / disk drives.
Improvement of interface performance, partial response, etc.
Of new signal processing method to improve linear recording density
No. However, in recent years, track density has been increasing.
Direction greatly exceeds the increasing trend of linear recording density,
Is a major factor in the improvement. This is a traditional induction type
Magnetics with much better playback output performance than magnetic heads
This is due to the practical use of the resistive element type head. Currently magnetic
With the practical use of the magnetoresistive element type head, only a few μm
Rack width signal can be reproduced with high S / N ratio
Noh. On the other hand, future head performance
As mentioned above, in the near future track pitch will be sub-micro
Is expected to reach the territory. A magnetic head corrects such a narrow track.
For reliable scanning and signal reproduction with high S / N ratio
Is important for tracking servo technology of magnetic head.
Play a part. Regarding such tracking servo technology
For example, see "Yamaguchi: High-precision magnetic disk drive
Technology, Journal of the Japan Society of Applied Magnetics, Vol.20, No.3, pp.771,
(1996)]. According to this document
If the current hard disk drive
In one round, that is, within a certain angle during 360 degrees
The tracking servo signal and address information signal are
The area where the raw clock signal and the like are recorded
Matt. " ) Is provided. This allows the magnetic
The head reproduces these signals at regular intervals and
Check the position of
It can scan on the track accurately while correcting
You. The above-described tracking servo signal and add
Pre-formatting of address information signal, reproduction clock signal, etc.
The signal is sent by the magnetic head to accurately scan the track
Since it is a reference signal for
Accurate track positioning accuracy is required. For example,
Matsu, et al .: Current Status and Prospects of Mechanical Servo, HDI Technology, Japan
Material of the 93rd meeting of JSAP, 93-5, pp.35 (19
96)), the current hard drive
Disk drives drive magnetic disks and magnetic heads.
After installing in the Eve, a dedicated servo track recording device
Using a unique magnetic head built into the drive
Tracking servo signals and address information signals
Signal, reproduced clock signal, etc. are recorded. This place
In this case, a unique magnetic head built into the drive is
External actuator installed in robot track recorder
Recording with precise position control
Thus, the required track positioning accuracy is realized. [0006] Pre-format recording
For the signal pattern to be
For applications such as signals, address information signals, and clock signals
Depending on the purpose, to maximize the target performance
Preferred configurations can be devised. However,
Formatting using a servo track recording device for
The traditional method of recording is built into the drive.
Preformatted signal by a unique magnetic head
Is recorded, the signal of preformat recording is
There are significant restrictions on the magnetization pattern. [0007] For example, magnetic
The recording track width of the magnetic head in the recording / reproducing device is:
Usually, it is set narrower than the track pitch,
Guard bands of a certain width between the recording tracks
Is provided. The above recording track width and guard van
The data width depends on the type of signal to be preformatted.
It cannot be changed arbitrarily. But Trackin
Servo signals, address information signals, and clock signals.
The recording track width of the signal
In some cases, several tracks must be traversed continuously.
If you can show excellent target performance
There is also. Also, interference of the magnetization pattern between adjacent tracks
Conversely, in signal recordings of a kind
Larger width guard with smaller recording track width
It is preferable to provide a band. Further, magnetic recording of a video tape recorder or the like
In a playback device, the recording gap is set in the track width direction.
So-called “azimuth recording method”
Expression] has been adopted. With this, from the adjacent track
Crosstalk noise can be reduced,
Advantages such as the ability to perform address recording can be obtained. Magnetic
Also in the preformat recording of the
Arbitrary magnetization pattern in the track width direction as described
If it is possible to record while tilting to
It is possible to devise various configurations to obtain performance.
You. However, a unique magnetic head built into the drive
Conventional method of recording preformatted signals by
The recording gap in the track width direction
It is impossible to incline at will. The present invention solves the above-mentioned problems in the prior art.
The tracking service
Applications such as signal, address information signal, clock signal
It is possible to maximize the target performance according to
Magnetic recording reproduction with preformat recording magnetization pattern
An object of the present invention is to provide a method of manufacturing a raw device. [0010] In order to achieve the above object,
Therefore, the method of manufacturing a magnetic recording / reproducing apparatus according to the present invention
Shape pattern of ferromagnetic material corresponding to format information signal
A magnetic disk on the surface of a master information carrier
The preformat information signal
A magnetic data in which a magnetization bit pattern corresponding to
A method for manufacturing a magnetic recording / reproducing apparatus having a disk mounted thereon.
Corresponding to the pre-recorded preformat information signal.
Of the corresponding magnetized bit patterns,
Recording of the corresponding portion in the radial direction of the magnetic disk
The width of a magnetic recording head mounted on a magnetic recording / reproducing device
It is characterized in that it is configured to be smaller than the track width
I do. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to embodiments.
Will be described more specifically. The configuration of a magnetic recording / reproducing apparatus according to the present invention
It is basically the same as the device described above. That is, the magnetic disk
Is supported by a rotating shaft such as a motor, and has a predetermined rotation speed.
Can rotate in degrees. On the recording surface of the magnetic disk
Has a built-in magnetic head.
To record information signals on the magnetic disk and
The information signal recorded on the disc can be reproduced. Magnetic
The magnetic head has a magnetic head at least
A drive mechanism for radial movement is provided.
With the above configuration, the magnetic head
While moving in the radial direction of the magnetic disk,
All concentrically or spirally recorded on the
It is possible to scan on a recording track. The drive mechanism
Indicates the tracking service reproduced by the magnetic head.
The magnetic head works in conjunction with the
A machine that performs tracking so as to accurately scan on the rack
Has the ability. Generally, this drive mechanism has a voice
Coil motors and linear motors are used.
In order to improve racking performance, various
It can also be used in combination with a tutor mechanism. The magnetic disk mounted on the apparatus of the present invention
The number of contacts is not limited to one.
Good. Similarly, for the magnetic head, the number of magnetic disks
It is possible to mount the required quantity according to the requirements. Ma
The magnetic disk is always fixed to the rotating support
It is not necessary, for example, with a removable disk that can be
There may be. The magnetic disk of the present invention has a tracking
Servo signal, address information signal, and clock signal.
Bit pattern corresponding to the preformat information signal
Are recorded in advance. This magnetization bit pattern
Corresponds to the preformat information signal on the surface of the substrate
An uneven shape is formed, and at least the convex surface of the uneven shape is
Surface of master information carrier composed of ferromagnetic material
Is recorded by bringing it into contact with the surface of the magnetic disk.
It is. Drive using dedicated servo track recording device
Pre-forced by a unique magnetic head built into the
The conventional method of recording a mat information signal uses the magnetic recording method of the present invention.
It cannot be used in a recording / reproducing device. Hereinafter, in the configuration of the present invention, a preformer
The above master used as a means for performing packet recording
Regarding static batch surface recording technology using information carriers,
An outline will be described. FIG. 10 shows an example of a preformat recording technique.
1 shows a configuration example of a master information carrier surface to be used. FIG.
0 is, for example, a disk-shaped magnetic recording medium (magnetic disk)
Constant in the circumferential direction (that is, the track length direction)
Recorded in the preformat area provided for each angle
The master information pattern in the radial direction of the magnetic disk.
That is, only 10 tracks are shown in the track width direction).
Things. For reference, the master information pattern
Is recorded on the magnetic disk,
A recording track portion serving as a data area is indicated by a broken line. Real
The master information carrier has a master information pattern on the surface.
The magnetic data is recorded in accordance with the recording area of the magnetic disk to be recorded.
At fixed angles in the circumferential direction of the disk, and
In the radial direction of the disc, as shown in FIG.
A master information pattern is formed. The master information pattern is, for example, as shown in FIG.
As shown, clock signal and tracking servo signal
Signal, address information signal, etc.
It is arranged sequentially in the direction. Master of the invention
The master information pattern on the information carrier is
It is formed by a surface uneven shape corresponding to the pattern. An example
For example, in FIG. 10, the hatched portion is a convex portion.
The surface is made of ferromagnetic material
ing. A fine signal corresponding to an information signal as shown in FIG.
The fine concavo-convex pattern is, for example,
In the process of forming a tar stamper, semiconductor process, etc.
Using various microfabrication techniques used
Can be. FIG. 11 shows a dashed line AA 'in FIG.
Of the master information carrier in the track length direction
You. In the configuration shown in FIG.
A ferromagnetic thin film 12 is deposited on the surface of
Exposure and development of the resist film applied to the surface
After patterning the concavo-convex shape corresponding to the
Ferromagnetic thin by dry etching technology such as milling
A fine uneven pattern was formed on the film 12. This place
In this case, the etching depth of the concave portion is extended to the inside of the base 11,
Although the ferromagnetic thin film 12 is left only on the surface of the projection,
The etching depth is kept below the thickness of the ferromagnetic thin film 12 and
As a structure in which the ferromagnetic thin film 12 is left in both the convex portion and the convex portion
Is also good. Master information carrier shown in FIGS. 10 and 11
Preform on magnetic recording media such as magnetic disks using
The mat recording is performed as follows. That is,
Contact the uneven surface of the star information carrier with the surface of the magnetic recording medium
For example, in the case of an in-plane magnetic recording disk medium,
Applying a DC excitation magnetic field in the in-plane direction of the disk
The ferromagnetic thin film 12 in the convex portion of the information carrier is magnetized, and the
A preformat information signal corresponding to the pattern is recorded. This
In the case of, before recording the preformat information signal,
By erasing the DC in the DC disk uniformly in advance,
Sufficient recording close to saturation recording can be easily performed. The preformat recording method described above is
Compared to the conventional method using a servo recording device for
Very short and inexpensive format recording time
It is. Also, the transition of magnetization at the end of the recorded track is sharp.
Excellent steepness enables more accurate tracking. In the configuration shown in FIG.
Uneven shape of master information carrier corresponding to mat information signal
The width of the projection in the radial direction of the magnetic disk
Designed to be the same as the recording track width of the magnetic head.
ing. Therefore, using the master information carrier shown in FIG.
When performing preformat recording on a magnetic disk
Of the recorded magnetic bit pattern in the radial direction of the magnetic disk
Recording width is the same as the recording track width of the magnetic head.
Become. As described above, the master information carrier having the configuration shown in FIG.
Bit pattern recorded on a magnetic disk using a magnetic body
And a conventional dedicated servo track recording device.
The magnetic head built into the live
Basically similar to the magnetized bit pattern recorded on the
It becomes a shape pattern. On the other hand, the above-mentioned master information carrier was used.
In preformat recording technology, conventional dedicated services
Integrated into the drive using a robot track recorder.
Preformat information signal by magnetic head
Bit pattern that could not be realized by the conventional method
Can be recorded. That is,
In preformat technology using star information carrier
Is the master information carrier surface
Format-recorded signal on magnetic disk
It almost corresponds to the magnetization bit pattern. For this reason,
Preformat recording using a servo track recording device
The magnetization pattern of a signal that is preformatted as in
The surface of the master information carrier is not restricted
By arbitrarily devising and forming the uneven shape of
Arbitrary magnetization pattern of format recorded signal
It becomes possible to design. This allows tracking
Servo signal, address information signal, and clock signal.
Depending on the intended use
Preformat recording possible preferred magnetization patterns
Can be The following describes the use of a signal to be preformatted.
Preferred embodiments of the present invention devised according to
And will be described with reference to the drawings. [First Embodiment] FIG. 1 and FIG.
A magnetic recording / reproducing apparatus according to the first embodiment of the present invention is mounted.
Preformat recorded in advance on the magnetic disk
2 shows a configuration example of a magnetization pattern of a selected signal. The magnetization patterns shown in FIG. 1 and FIG.
Pattern is formed by the uneven shape of the surface,
At least the convex surface is made of ferromagnetic material
The master information carrier into contact with the surface of the magnetic disk.
It is recorded by On the other hand, FIG.
A unique magnetic head built into the drive using a recording device
Preformat recorded on the magnetic disk by the
FIG. 1 and FIG. 2 show an example of the configuration of a conventional magnetized pattern thus obtained.
In response. FIGS. 1 to 3 show, for example, the circumference of a magnetic disk.
Direction (ie, the track length direction)
Various types recorded in the preformat area provided in
Of the preformat signal of the tracking servo
Signal, clock signal for synchronization and amplifier gain
Synchronous signal used as reference signal for control
The configuration example of the magnetization pattern of FIG.
That is, only five tracks are shown in the track width direction).
It is. For reference, the magnetic head mounted on the device is
A portion corresponding to the recording track of the pad 1 is indicated by a broken line. In the conventional example shown in FIG.
The preformat signal is
Number is recorded, the recording track width is
It can be changed arbitrarily depending on the type of signal to be recorded.
I can not do such a thing. Therefore, the recorded tracking service
The recording width of the servo signal, clock signal and synchronous signal is
All the same. The recording track of the magnetic head 1
The width 5 is usually set narrower than the track pitch 4.
A certain width between adjacent recording tracks.
Guard band 6 is provided. In the conventional example as shown in FIG.
The magnetic head 1 for reproducing the signal and the synchronous signal is originally
Guard band slightly off the recording track to be scanned
In the case where the scanning is performed on the region including the number 6, the amplitude of the reproduced signal is reduced.
I will. Clock signal and synchronous signal are recorded and reproduced
This is a reference signal for controlling the system.
It is not preferable that the reproduction signal amplitude
No. Therefore, originally, the clock signal and the synchronous signal
In the preformat recording area of
It is preferable to make the width of 6 as small as possible.
This has not been possible. On the other hand, in the case of the configuration of the present invention,
The magnetization pattern of a signal that is preformatted as in
Clock signal and system
In the preformat recording area of the synchronous signal,
It is possible to make the width of the guard band 6 as small as possible.
You. In the configuration of the present invention shown in FIG.
Of the various preformat signals shown, the clock
Signal and synchronous signal in the radial direction of the magnetic disk
That is, the recording width in the track width direction)
The width is set to be larger than the recording track width 5 of the node 1.
By adopting such a configuration,
The width of the guard band 6 can be reduced as much as possible.
Therefore, the recording track which the magnetic head 1 is to scan should be
Even when scanning is performed out of the
Can be controlled. On the other hand, in the configuration of the present invention shown in FIG.
Is one of the various preformat signals shown in the figure.
The recording area of the clock signal and the synchronous signal is
Multiple recording tracks continuously in the radial direction of the disc
To be traversed. In such a configuration,
Guard to recording area of clock signal and synchronous signal
Band 6 does not exist. Therefore, the magnetic head 1 originally runs
When scanning slightly off the recording track to be inspected
It is possible to make almost no decrease in reproduction signal amplitude
Therefore, it is more preferable than the configuration of FIG. However, magnetic
The signal in the disk circumferential direction (ie, the track length direction)
The recording width in the radial direction is too large compared to the bit length,
Sufficient recording due to the effect of the demagnetizing field associated with the recording bit shape
Since the signal strength may not be obtained,
It is preferable to select an appropriate configuration according to the application. In the configuration shown in FIGS. 1 and 2,
The tracking servo signal is applied in the radial direction of the magnetic disk.
Recording width is the same as the recording track width 5 of the magnetic head 1.
Set to width, but not necessarily limited to this configuration
Not in the tracking servo signal area
The recording width is larger than the recording track width 5 of the magnetic head 1.
May be large. Further, in the configuration of FIG.
Signal and the synchronous signal recording area are
Continuously traverses all recording tracks in the radial direction
Or in the radial direction of the magnetic disk.
Divides into a certain area, and connects only the recording tracks in that area.
It may be configured to cross continuously. In the latter case, the minutes
The guard band 6 is generated only between the cut areas.
However, the effect is sufficiently small compared to the conventional example shown in FIG.
Thus, the effects of the present invention can be sufficiently exhibited. Ma
In addition, the latter configuration reduces the effects of the above-described demagnetizing field.
It is also effective from the viewpoint that it can be done. [Second Embodiment] FIG. 4 shows a second embodiment of the present invention.
Mounted on magnetic recording / reproducing device in second embodiment
A signal pre-formatted on a magnetic disk
2 shows a configuration example of the magnetization pattern of FIG. The magnetization pattern shown in FIG.
Is formed by the uneven shape of the surface.
Master with at least convex surface made of ferromagnetic material
-To bring the information carrier into contact with the surface of the magnetic disk
Will be recorded. On the other hand, in FIG. 5, for example, as shown in FIG.
The width of the convex part in the radial direction of the magnetic disk
1 is designed to be the same as the recording track width 5.
Preformer on magnetic disk using star information carrier
FIG. 4 shows an example of the configuration of the magnet pattern recorded by dot recording.
I showed it. FIGS. 4 and 5 show, for example, the circumference of a magnetic disk.
Constant angle in the direction (ie, track length direction)
Each recorded in the pre-format area provided for each
Tracking signal
Magnetization pattern of clock signal, clock signal and address information signal
The example of the configuration of the
Only four tracks in the rack width direction are shown.
Note that, for reference, the magnetic head 1 mounted on the apparatus is described.
The portion corresponding to the recording track is indicated by a broken line. In the configuration example shown in FIG.
The recording width of the mat signal is equal to the recording track width 5 of the magnetic head 1.
Is set the same as Therefore, the preformat
The recorded tracking servo signal, clock signal and
The recording widths of the address information signals are all the same. Also,
Set up in the drive using the dedicated servo track recording device
Preformatted with unique magnetic head embedded
As with signal recording, adjacent recording tracks
The width of the guard band 6 provided between
Same in the area. Of the preformat signals, the address information
The information signal indicates the position on the surface of the magnetic disk
Track number in the radial direction of the disk and circumferential direction of the magnetic disk
Is indicated by the sector number in. Therefore,
A track is recorded on the address information signal recording portion of the magnetic disk.
Other programs, such as a king servo signal and synchronous signal
With a simple repetitive periodic signal like a reformatted signal
Differently, resulting in the recording of complex bit patterns.
You. In the configuration example shown in FIG.
When a bit pattern is recorded, bits between adjacent tracks
Is interfered, and the recording magnetization is complicated via guard band 6.
The magnetic interference region 7 fluctuates. like this
The magnetization interference region 7 with the adjacent bit has noise during reproduction.
Address detection error and seek speed reduction.
Cause and not preferred. With such adjacent bits
The phenomenon that the magnetization interference region 7 occurs is caused by a dedicated servo track.
Intrinsic magnetism built into the drive using the recording device
Conventional recording of preformatted signal by head
It is also recognized in the preformat recording method,
Higher track density recording of magnetic recording / reproducing devices
It is a serious problem in proceeding. The interference with adjacent bits as described above is reduced.
Preformat recording of the address information signal
It is necessary to make the width of the guard band 6 as large as possible in the area.
preferable. On the other hand, as described above,
In the preformat recording area of the chronous signal,
It is not preferable to increase the width of the guard band 6. One
That is, the recording track width 5 of the magnetic head 1 and the guard bang
Conventional pre-loader that cannot change the width of
Both are trade-offs in the format recording method
Was in a relationship. On the other hand, in the case of the configuration of the present invention,
The magnetization pattern of a signal that is preformatted as in
Address information signals,
Each preform of clock signal and synchronous signal etc.
-In the mat recording area, the width of the guard band 6
Can be set optimally. In the configuration of the present invention shown in FIG.
Of the various preformat signals shown, the clock
Signal radial direction of the magnetic disk (that is, track width direction)
Direction) is the recording track width of the magnetic head 1.
5 and the magnetic field of the address information signal.
The recording width of the magnetic disk 1 in the radial direction
It is set smaller than the recording track width 5. This
By adopting such a configuration,
Guard band 6 can be made as small as possible.
And guard band 6 in the address information signal area.
Can be made as large as possible. That is, the clock
The magnetic head 1 should scan in the
Even when scanning slightly off the recording track, playback
A decrease in signal amplitude can be suppressed. On the other hand,
In the data information signal area, adjacent bits as shown in FIG.
The magnetic interference region 7 does not occur. In this case, in the address information signal area
If the recording width of the magnetized bit pattern is too small,
Signal output amplitude may be reduced
It is necessary to keep in mind. However, recent magnetic recording and reproduction
Inductive recording element and magnetoresistive reproduction mounted on the device
-Element type magnetic head having element
The recording track width of the recording element
Compared to the recording track width of the reproducing element section.
The configuration is even smaller than the lock width. others
In the range where the effects of the present invention described above can be sufficiently obtained.
The magnetization bit pattern in the address information signal area
Even if the recording width of the
Does not decrease significantly. Rather, the magnetization
To reduce noise generated by the interference region 7
As a result, a higher reproduction S / N ratio can be obtained. In the configuration shown in FIG.
As in the configuration shown in FIG.
Continuously traverse multiple recording tracks in the disc radial direction
It may be configured to cut off. Also, in the configuration shown in FIG.
Recording of the servo signal for king in the radial direction of the magnetic disk
The recording width is set to the same width as the recording track width 5 of the magnetic head 1.
Is defined, but is not necessarily limited to this configuration.
Not in the tracking servo signal area.
Is larger than the recording track width 5 of the magnetic head 1.
It is good also as a structure. [Third Embodiment] FIGS. 6 and 7 show a third embodiment.
A magnetic recording / reproducing apparatus according to a third embodiment of the present invention
Preformat recorded in advance on the magnetic disk
2 shows a configuration example of a magnetization pattern of a selected signal. The magnetization patterns shown in FIG. 6 and FIG.
Pattern is formed by the uneven shape of the surface,
At least the convex surface is made of ferromagnetic material
The master information carrier into contact with the surface of the magnetic disk.
It is recorded by On the other hand, FIG.
A unique magnetic head built into the drive using a recording device
Preformat recorded on the magnetic disk by the
FIGS. 6 and 7 show examples of the configuration of the conventional magnetized pattern thus obtained.
In response. FIGS. 6 to 8 show, for example, the circumferential direction of a magnetic disk.
Direction (ie, the track length direction)
Various types recorded in the preformat area provided in
Clock signal and traffic signal
The configuration example of the magnetization pattern of the
4 tracks in the radial direction of the disc (that is, in the track width direction)
Only the rack is shown. For reference, magnetic
Broken line on the disc corresponding to track pitch 4
, And the four tracks shown in FIG.
Track numbers 1 to 4 are assigned to indicate the position of the recording track.
Definitely shown. The current tracking servo technology is generally used.
Are recorded on a plurality of adjacent tracks and between the tracks.
Based on the reproduced signal amplitude from the tracking servo signal
Magnetic head from a predetermined track center line
1 to detect the radial displacement of the magnetic disk and
For controlling radial displacement of magnetic disk of magnetic disk 1
It is. For example, as shown in FIGS. 1 to 5 and FIG.
The tracking servo signal pattern is
Diameter of magnetic disk of magnetic head 1 based on raw signal amplitude
In tracking servo technology that controls displacement in the direction
Is used. However, this technology does not
As the clock density increases, the frequency of the position signal
Increases bandwidth and tracks noise effects
There was a problem of affecting accuracy. As a solution to this, Japanese Patent Application Laid-Open No.
Japanese Patent No. 10472 discloses a technique based on phase detection of a reproduced signal.
A tracking servo technique is disclosed. FIG.
In addition, tracking based on phase detection disclosed in the publication
Tracking server used in servo technology
4 shows a configuration example of a magnetization pattern of a bo signal. Disclosed in the publication
In the tracking servo technology, for example, as shown in FIG.
As shown in the figure, a fixed phase change occurs every half track on the magnetic disk.
The magnetization bit pattern that causes the change is recorded. like this
Servo signals for tracking in the radial direction of the magnetic disk.
Playback track larger than half the track pitch
When reproduction is performed using the magnetic head 1 having a
1 corresponds to its own radial displacement of the magnetic disk.
Encounters a phase change of the reproduced signal. According to this technology,
By detecting the phase change of the reproduced signal,
By detecting the displacement of the head 1 in the radial direction of the magnetic disk,
The magnetic head 1 accurately scans a target recording track.
It is possible to perform tracking. A track based on the phase detection of the reproduced signal described above.
In order to maximize the effects of the Kick Servo technology
Indicates that the phase change of the reproduced servo signal is
Continuous and linear with radial displacement of magnetic disk
It is preferable that the change be made dynamically. From this perspective, magnetic discs
Pattern of the tracking servo signal recorded on the disk
Originally, a constant value is set for each half track as shown in FIG.
In a single track, not in a pattern that causes a phase change
Continuous and straight in relation to adjacent tracks
It is preferable that the phase change is generated. However, a dedicated servo track recording device is required.
In the conventional method of performing preformat recording using
Is driven by a unique magnetic head built into the drive.
Restrictions on recording preformat signals
Above, in tracking servo technology based on phase detection
Continuous and linear phase change considered to be preferable
-Format recording of magnetization patterns that cause
Can not. Therefore, as shown in FIG.
By recording the magnetization pattern that causes a phase change,
Causes a phase change due to the displacement of the air head 1 approximately
It has to be configured. A phase change occurs stepwise as shown in FIG.
When using a magnetized pattern, the phase of the reproduced signal is detected.
Tracking servo technology based on
Racking accuracy cannot be fully demonstrated. Ma
In order to record the magnetization pattern shown in FIG.
The recording track width of the magnetic head 1 mounted on the
It is necessary to make the pitch less than about half. This magnetic
1 is also used when recording a normal data signal.
Therefore, the recording track width of the data signal is equal to the track pitch.
4 or less, which requires the reproduction output amplitude of the same signal
It will be reduced more than this. In addition, a dedicated servo
When performing preformat recording using a rack recording device
In the conventional method, two stages per track
Because a bit pattern is recorded,
The time required for mat recording becomes extremely long,
Magnetic head with signal phase control and external actuator
1 position control becomes extremely difficult. From the background described above, the phase detection of the reproduced signal is performed.
More than 10 years since the proposal of tracking servo technology based on
After that, in the magnetic recording / reproducing apparatus, the reproduction signal
Tracking servo technology based on amplitude detection becomes mainstream
ing. On the other hand, in the case of the configuration of the present invention,
The magnetization pattern of a signal that is preformatted as in
The phase of the reproduced signal is not
Continuous suitable for servo-tracking technology based on GPS?
Recording a magnetization pattern that produces a linear phase change
It is possible. In the configuration of the present invention shown in FIGS.
Indicates various preformats recorded on the magnetic disk
Of the signals, the bit corresponding to the tracking servo signal
The magnetic transition region between bits in the
And the reproducing gap 8 of the head 1 has an inclination angle 10.
You. Here, the magnetization transition region between bits is a magnetic disk.
Between adjacent bits with opposite magnetization polarity in the circumferential direction
Is the boundary part of 6 and FIG.
The hatched bits and hatched parts
Boundary line with missing bits (for example, the part indicated by a)
Becomes a magnetization transition region. This area is hatched
Of the magnetization 2 of the shaded part and the unhatched part
Is a portion where the magnetization polarities 3 of the two abut against each other. Real
In some cases, the polarity 2 of magnetization is opposite in a finite narrow area.
Since it is the part that is gradually transitioning to property 3, the magnetization transition area
Called area. For tracking as shown in FIGS.
Reproduces servo signals almost parallel to the radial direction of the magnetic disk
Reproducing using magnetic head 1 having gap direction 9
The magnetic head 1 changes its own diameter in the radial direction of the magnetic disk.
Encounters a phase change of the reproduced signal corresponding to the position. Therefore, the book
According to the magnetic recording and reproducing apparatus of the present invention, such a reproduced signal
By detecting the phase change of the magnetic head 1,
Detecting the radial displacement of the disk, the magnetic head 1
Track so that the target recording track is accurately scanned
Can be performed. Unlike the conventional configuration shown in FIG. 8, FIG.
In the configuration shown in FIG.
Is it truly continuous in response to its own radial displacement?
Can detect the phase change of the linear playback signal
You. This allows the servo to be driven based on the phase detection of the reproduced signal.
Superior tracking accuracy inherent in racking technology
It is possible to demonstrate. In addition, the configuration of the present invention,
As described above, the pre-
Since the mat signal is recorded on the entire surface, the dedicated
Preformat recording using a robot track recorder.
To solve various problems that are problems with the configuration of FIG.
You can also. Therefore, a magnetic recording device having the configuration of the present invention can be used.
The recording / reproducing device is very much compared to the conventional magnetic recording / reproducing device.
It will be cheap. In the configuration of the present invention, as shown in FIG.
And recording of clock signals and servo signals for tracking
Region divided by guard band for each adjacent track
The configuration shown in FIG.
The recording area of the servo signal and tracking servo signal is magnetic.
Continuously record multiple recording tracks in the radial direction of the disc
May be crossed. In the former case, FIG.
As shown, the width of the guard band is made as small as
Clock signal and tracking in radial direction of disk
The recording width of the servo signal is
Or a configuration larger than the recording track width of the recording head
Is more preferable. The magnetization transition region between the bits as described above is
An inclination angle 10 is provided between the magnetic head 1 and the reproducing gap 8.
The configuration of the present invention that uses only the servo signal for tracking
And can be applied to various signals. That is,
Signal, address information signal and synchronous signal.
Recording other pre-format signals
Also, the magnetization transition region between the bits is
Applying the configuration of the present invention having an inclination angle with the tip 8
This makes it possible to select the optimal magnetization bit for each signal application.
Pattern can be devised to improve the target performance
It becomes. In this case, depending on the purpose of the signal and the magnetization pattern
In the same manner as the configuration example of the address information signal shown in FIG.
The recording width in the radial direction of the magnetic disk
A configuration smaller than the recording track width 5 of 1 may be used together.
No. [Fourth Embodiment] FIG. 9 shows a fourth embodiment of the present invention.
Mounted on a magnetic recording / reproducing apparatus according to the fourth embodiment
A signal pre-formatted on a magnetic disk
2 shows a configuration example of the magnetization pattern of FIG. The shape of the magnetization pattern shown in FIG.
Has the same shape as the magnetization pattern shown in FIG. Only
However, the configuration shown in FIG. 2 corresponds to the preformat information.
Magnetized bits are magnetized in the circumferential direction of the magnetic disk.
In contrast, in the configuration shown in FIG.
The magnetized bit corresponding to the information is approximately in the radial direction of the magnetic disk.
It is magnetized in parallel. That is, with the configuration shown in FIG.
Indicates the polarity 2 of the magnetization in the hatched area and the hatching
The polarity 3 of the magnetization of the part not subjected to
Have opposite polarities in the circumferential direction, but the structure shown in FIG.
In the configuration, the polarity 2 of the magnetization of the hatched
The polarity 3 of the magnetization of the part not subjected to the
The polarities are opposite to each other in the radial direction of the disc. The magnetization patterns shown in FIG. 2 and FIG.
A similar pattern is formed by the uneven shape of the surface.
At least the convex surface of the uneven shape is made of ferromagnetic material.
The master information carrier composed of
Is recorded by contacting the However, as shown in FIG.
When recording a magnetized pattern, the strong magnetic
Information in which the conductive material is magnetized in the circumferential direction of the magnetic disk
The information carrier is used to record the magnetization pattern shown in FIG.
In such a case, the ferromagnetic material constituting
A radially magnetized master information carrier is used. The configuration shown in FIG.
When the recording width in the radial direction is larger than the signal bit length of
Also have the advantage that it is easy to obtain a sufficient recording signal strength.
Have. FIG. 2 is referred to in the first embodiment.
As described above, the signal bits in the circumferential direction of the magnetic disk
When the recording length in the radial direction is
In this case, the value decreases due to the effect of the demagnetizing field accompanying the recording bit shape.
In some cases, magnetic loss occurs and sufficient recording signal strength cannot be obtained.
is there. On the other hand, in the configuration shown in FIG.
Even if the shape is difficult to generate demagnetization loss due to demagnetizing field
Magnetization remains in the direction
A proper recording signal intensity can be easily obtained. like this
In the configuration of the present invention, the preformat information signal
The appropriate recording magnetization direction according to the signal pattern
Is also possible. The magnetic recording medium of the present invention having the structure shown in FIG.
In the magnetic head 1 mounted on the recording / reproducing device, the magnetic head
Detection of change in polarity of magnetization recorded in the radial direction of a magnetic disk
Have a suitable gap configuration so that
Is necessary. The present invention will be described with reference to the four embodiments.
Although described, the invention is limited to these embodiments.
Not applicable, but applicable to various other embodiments
It is. For example, in the above embodiment, the magnetic
Focus on hard disk drives as recording and playback devices.
However, the present invention is not limited to this.
There is no flexible magnetic disk with disk interchangeability.
It can also be applied to magnetic recording and playback devices such as disk drives.
In this case, the same effect as above can be obtained. In the above embodiment, the magnetic recording
Focus on devices that use longitudinal magnetic recording disks as recording media
However, the present invention is not limited to this.
Instead of perpendicular magnetic recording disk
It is also possible to achieve the same effect as above.
Is obtained. In the above embodiment, the magnetic disk
The tracking signal is used as the information signal recorded on the disk.
Signal, address information signal, clock signal, synchronizer
Focus on preformat information signals such as
As described above, the information signal applicable in the present invention is also:
It is not limited to these signals. For example,
By applying the configuration described above, various data signals and
Audio, video signals, etc.
It is possible in principle to implement a recording and playback device and provide it at low cost.
Noh. In this case, when performing preformat recording
In addition, the appropriate recording magnetization pattern for each signal application
There is more room for devising a solution and improving the target performance. As described above, according to the present invention,
In preformat recording of a magnetic recording / reproducing device,
Maximizing the target performance depending on the signal application
To achieve the optimally designed magnetization pattern
It is possible. Therefore, tracking performance, seekability
Magnetic recording / reproducing device with excellent target performance such as performance and reliability,
It can be provided at a lower cost than before. Also book
According to the invention, an even higher track of the magnetic recording and reproducing apparatus
Densification can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of a magnetization pattern of a signal pre-formatted on a magnetic disk mounted on a magnetic recording / reproducing apparatus according to a first embodiment of the present invention; is there. FIG. 2 is a diagram illustrating another configuration example of a magnetization pattern of a signal that is preformat-recorded in advance on a magnetic disk mounted on the magnetic recording / reproducing device according to the first embodiment of the present invention. FIG. 3 shows a configuration example of a conventional magnetization pattern preformat-recorded on a magnetic disk by a unique magnetic head incorporated in a drive by using a dedicated servo track recording device, corresponding to FIGS. 1 and 2. FIG. FIG. 4 is a diagram illustrating a configuration example of a magnetization pattern of a signal that is preformat-recorded in advance on a magnetic disk mounted on a magnetic recording / reproducing device according to a second embodiment of the present invention. FIG. 5 is a configuration example of a magnetization pattern preformat-recorded on a magnetic disk using a master information carrier designed such that a width of a convex portion in a radial direction of the magnetic disk is equal to a recording track width of the magnetic head; FIG. FIG. 6 is a diagram showing a configuration example of a magnetization pattern of a signal pre-formatted and recorded on a magnetic disk mounted on a magnetic recording and reproducing apparatus according to a third embodiment of the present invention. FIG. 7 is a diagram showing another configuration example of a magnetization pattern of a signal preformat-recorded on a magnetic disk mounted on a magnetic recording / reproducing apparatus according to a third embodiment of the present invention. FIG. 8 shows a configuration example of a conventional magnetization pattern preformat-recorded on a magnetic disk by a unique magnetic head incorporated in a drive by using a dedicated servo track recording device, corresponding to FIGS. 6 and 7. FIG. FIG. 9 is a diagram illustrating a configuration example of a magnetization pattern of a signal pre-formatted and recorded on a magnetic disk mounted on a magnetic recording / reproducing apparatus according to a fourth embodiment of the present invention. FIG. 10 is a diagram showing a configuration example of a master information carrier surface used for a preformat recording technique. 11 is a cross-sectional view of the master information carrier in the track length direction taken along a chain line AA ′ in FIG. 10; [Description of Signs] 1 Magnetic head 2 Magnetization polarity of hatched portion 3 Magnetization polarity of non-hatched portion 4 Track pitch 5 Recording track width of magnetic head 6 Guard band 7 Magnetization interference region with adjacent bit Reference Signs List 8 reproduction gap of magnetic head 9 direction of reproduction gap 10 tilt angle 11 substrate 12 ferromagnetic thin film

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/12 G11B 20/12 (72) Inventor Kiyokazu Toma 1006 Ojidoma, Kadoma, Osaka Matsushita Electric Industrial Co., Ltd. In-company (72) Inventor Hiroshi Ryouchi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Keizo Miyata 1006 Okadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D006 DA03 5D044 BC01 CC05 DE17 DE38 DE58 EF05 5D091 AA10 BB07 GG01 GG33 JJ25 5D112 JJ10

Claims (1)

Claims: 1. A magnetized bit corresponding to a preformat information signal by contacting a magnetic disk with a surface of a master information carrier having a shape pattern of a ferromagnetic material corresponding to the preformat information signal. A method of manufacturing a magnetic recording / reproducing apparatus having a magnetic disk on which a pattern is recorded in advance, wherein a magnetic bit pattern corresponding to an address information signal in a portion corresponding to an address information signal in a magnetization bit pattern corresponding to the prerecorded preformat information signal is provided. A method for manufacturing a magnetic recording / reproducing apparatus, wherein a recording width in a radial direction of a disk is smaller than a recording track width of a magnetic head mounted on the magnetic recording / reproducing apparatus.