JP2972138B2 - Magnetic disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk used in a magnetic disk recording / reproducing apparatus constituting a digital data memory system or the like.

[0002]

2. Description of the Related Art As an external memory device attached to an electronic device such as a computer, a magnetic disk recording / reproducing device for writing data to a magnetic disk and reading data from the magnetic disk is widely used. A magnetic disk used in such a magnetic disk recording / reproducing device is
For example, a recording region is formed by providing a magnetic layer extending around the central hole on the surface of a substrate formed of aluminum or the like in a disk shape and having a central hole. In such a recording area, for example, information data is tracked at the time of reading on a large number of recording tracks formed concentrically around a central hole.
The information is written in such a manner that servo control information can be obtained.

FIG. 7 shows an example of a conventionally proposed magnetic disk, in which a base hole 11 is provided in a base 11, and a recording layer 13 is formed by providing a magnetic layer on the surface. A large number of concentric recording tracks TX are formed in the recording area section 13. Information data for each recording track TX is obtained in such a manner that tracking servo control information can be obtained at the time of reading. Is written, for example, so that a predetermined number of sectors SX are arranged and formed.

The sector SX in each recording track TX
In each case, as shown in FIG. 8, a recording pattern in which a control information recording area RS and a data information recording area RD are formed can be obtained. In the data information recording area RD, a continuous band-shaped data information recording section 14 is formed. In the control information recording area RS, a synchronization signal recording section 15 and a control information providing section 16 are formed. You. The control information providing unit 16 writes, for example, recording portions A and B in which two types of tracking servo control signals having different frequencies from each other are recorded on the data information recording unit 14 in the data information recording region RD. Are formed so as to be displaced in the direction along the recording track TX, and to be arranged in the width direction of the data information recording unit 14 by positioning the boundary between them at the center in the width direction of the data information recording unit 14. It is assumed that.

As described above, each of the sectors SX on each recording track TX is
Recording portions A and B in which two types of tracking servo control signals having different frequencies are recorded, respectively.
However, the data information recording unit 14 is formed so that it is displaced in the direction along the recording track TX, the boundary between them is located at the center of the data information recording unit 14 in the width direction, and is arranged in the width direction of the data information recording unit 14. Thus, when the magnetic head reads the data information from the data information recording unit 14 on each recording track TX, the control information providing unit 16 obtained from the magnetic head is read.
The tracking servo control for the magnetic head is performed based on the read output of the tracking servo control signal in each of the recording portions A and B, and the magnetic head controls the data information recording section 14 in each recording track TX. You will be in the proper tracking state.

[0006]

However, as described above, when the control information providing unit 16 is formed in each sector SX in each of the multiple recording tracks TX provided in the recording area 13 of the magnetic disk. The two types of tracking / servo control signals are written to the recording portions A and B, respectively. Such writing is relatively long especially when the recording track TX is formed with high density. It takes time, and the productivity of the magnetic disk is reduced. Further, with the increase in the density of the recording tracks TX, the influence of magnetic flux leakage from the magnetic head upon writing of the tracking servo control signals in the recording portions A and B exerts a great influence on the surrounding recording portions. ,
When the data information is read from the data information recording unit 14 in each recording track TX, the read output of the tracking servo control signal obtained from the magnetic head indicates that the undesired noise component contained therein has increased. The following inconvenience occurs.

In connection with such a magnetic disk, 1987
Research Repo-rt, MEDIA NOISE IN
THIN-FILM DISCRETE MAGNETIC TRACKS, IBM Research
In the Di-vision, Almaden Research Center, a magnetic head is formed for each of the recording tracks that are to be formed with grooves between the recording tracks in the recording area of the magnetic disk. It has been proposed to perform writing and reading of signals by the above method, in which case the advantage is that unwanted noise components contained in the read output of the signal obtained from the magnetic head are reduced. As described above, when the tracking servo control signal is written as described above and the control information providing section is formed, especially when the recording tracks are formed with high density, the tracking servo control is performed. The disadvantage that a relatively long time is required for writing the application signal is not solved.

In view of the above, the present invention relates to a method for forming an annular recording track, and forming an information recording section and a control information providing section disposed in association with the annular recording track. It is an object of the present invention to provide a magnetic disk in which the control information providing section can be easily formed even when the magnetic disk is formed with high density, thereby improving the productivity.

[0009]

In order to achieve the above-mentioned object, a magnetic disk according to the present invention is formed in a disk shape having a central hole, and is formed so as to be intermittent through a cut-off portion. An annular convex portion surrounding the hole, and a substrate having a plurality of convex portions arranged in a predetermined pattern in a blocking portion of the annular convex portion, and a substrate having an annular convex portion and a plurality of convex portions formed thereon. The first portion corresponding to the annular protrusion and the second portion corresponding to the plurality of protrusions are provided substantially uniformly over the entire predetermined region including the annular protrusion and the plurality of protrusions. A data information recording portion is formed by the first portion of the magnetic layer, and the second portion of the magnetic layer is magnetized by a common signal or written by a common signal to control the data portion. An information provision department is formed, Recording tracks, shielding the annular projection
From the surrounding part including the part other than the multiple convex parts of the cut part
It is to be provided as having a large height position and being separated from its surroundings.

[0010] In the magnetic disk according to the present invention thus configured, the magnetic layer forming the data information recording portion is arranged with a predetermined pattern on the cut-off portion of the annular convex portion provided with the first portion. Multiple convex parts
By magnetizing a common portion or writing a common signal to the second portion of the magnetic layer provided therein, a control information providing portion is formed. Magnetization of the second portion with a common signal or writing of a common signal is easily performed because the second portion of the magnetic layer is commonly used. Accordingly, the control information providing unit is easily formed, and the productivity is improved.

[0011]

FIG. 2 shows an example of a magnetic disk according to the present invention. In this example, for example, a center hole 22 is provided in a base 21 formed in a disk shape from an aluminum material, and the base 21 has a substantially uniform hole around the center hole 22 throughout the base. The recording area 23 is provided with a magnetic layer. And
In the recording area section 23, information data is written in a large number of concentrically formed recording tracks TN surrounding the central hole 22 in such a manner that tracking servo control information can be obtained at the time of reading. The writing of the information data in each of the recording tracks TN is performed such that a predetermined number of sectors SN are sequentially formed.

Sector SN in each recording track TN
In each case, as shown in FIG. 1, a recording pattern in which a control information recording area AS and a data information recording area AD are formed is obtained. The data information recording area AD extends in the direction along the recording track TN, and extends upward from a hatched portion (FIG. 1).
Of the magnetic layer provided substantially uniformly over the entire recording area 23 on the flat top convex portion protruding in a direction perpendicular to the surface of the paper and in a direction from the back surface to the front surface). A section data information recording section 25 in which corresponding portions are arranged is formed. Also, the control information recording area AS
Is formed as a flat-top convex portion extending in a direction perpendicular to the recording track TN and projecting upward from a hatched portion, on which substantially the entire recording area 23 extends. Information providing unit 26, in which the corresponding parts of the magnetic layers provided in the above manner are arranged, is formed. A flat top protrusion protrudes upward from the hatched portion, and a corresponding one of the magnetic layers provided substantially uniformly over the entire recording area portion 23 thereon. A control information providing unit 27 in which parts are arranged is formed. The control information providing unit 27 is configured such that the two rectangular protrusions 27A and 27B are displaced in the direction along the recording track TN with respect to the section data information recording unit 25 formed in the data information recording area AD. The boundary between them is located at the center in the width direction of the section data information recording section 25, and is formed so as to be arranged in the width direction of the section data information recording section 25.

Under such a configuration, in the data information recording area AD recording area section 23, each of a large number of concentrically formed recording tracks TN corresponds to the control information recording area AS in each sector SN. Is a cut-off portion, and a plurality of divided data information recording portions 25 intermittently interposed through the cut-off portion and surrounding the central hole 22.
And a synchronous information providing unit 26 and two rectangular convex portions 27A and 27B arranged in a predetermined pattern in a control information recording area AS which is a blocking portion of the data information recording portion. The control information providing section 27 is formed. Accordingly, the disk-shaped base 21 having the central hole 22 is provided with a plurality of divided data information recording sections 25.
Corresponding to the data information recording portion consisting of: an annular flat-top convex portion that is intermittent through a blocking portion and surrounds the central hole 22, and is arranged in a predetermined pattern at the blocking portion of the annular convex portion. , A plurality of flat tops corresponding to the synchronization information providing unit 26 and a plurality of flat tops corresponding to the control information providing unit 27 are provided.

A magnetic layer forming each section data information recording section 25, a magnetic layer forming each synchronization information providing section 26, and two rectangular convex sections 27A forming each control information providing section 27 Any one of the magnetic layers disposed on 27B, or the magnetic layer forming each synchronization information providing unit 26 and the magnetic layer in two rectangular convex portions 27A and 27B forming each control information providing unit 27 But,
Magnetization by a common signal or writing of a common signal is performed.

FIG. 3 shows a rectangular projection 2 constituting the control information providing unit 27 in the magnetic disk according to the present invention.
An example of a specific configuration of a portion including 7A is shown. In this example, in a portion to be the recording area 23 in the base 21, a portion around the position where the rectangular convex portion 27A is to be formed forms the concave portion 21 '.
Position to the rectangular projecting portion 27A is formed is formed as a one that projects upward relative to the recess 21 '. Then, in the portion to be the recording area 23 in the base 21 in which the concave portion 21 'is formed, for example, the nickel-phosphorus layer 41, the chromium layer 42, the magnetic layer 4
3, a protective layer 44 made of carbon or the like and a lubricant layer 45 are sequentially and substantially uniformly laminated, whereby a nickel-phosphorous layer 41, a chromium layer 42, a magnetic layer A laminate structure of a protective layer 43, a protective layer 44 and a lubricant layer 45 is provided to form a rectangular convex portion 27A. That is, a nickel-phosphorous layer 41, a chromium layer 42, a magnetic layer 43, a carbon layer, etc., which form a laminated structure provided on a position where the rectangular convex portion 27A is to be formed on the base 21 and on a portion surrounding the position. The protective layer 44 and the lubricant layer 45 are formed of a nickel / phosphorous layer 41, a chromium layer 42, a magnetic layer 43, and a carbon layer laminated on a portion to be the recording area 23 in the base 21 in which the concave portion 21 'is formed. The protective layer 44 and the lubricant layer 45 are composed of the same components. In such an example, the rectangular convex portion 2 constituting the control information providing portion 27 together with the rectangular convex portion 27A
7B, synchronization information providing unit 26 and partitioned data information recording unit 2
Each of No. 5 has the same configuration as the rectangular convex portion 27A and is formed.

The rectangular data protruding portions 27A and 27B constituting the divided data information recording section 25, the synchronization information providing section 26, and the control information providing section 27 are, for example, formed on the base 2
1, rectangular projections 27A and 27B constituting a section data information recording unit 25, a synchronization information providing unit 26, and a control information providing unit 27 are to be formed. Etching is performed under masking according to the shape of the portion, a concave portion 21 ′ is formed in a portion other than the masked portion, and thereafter, a recording area portion of the base 21 in which the concave portion 21 ′ is formed. After the masking is removed from the surface of the portion to be made 23, the nickel-phosphorous layer 41, the chromium layer 42, the magnetic layer 43, the protective layer 44, and the lubricant layer 45 are successively and substantially uniformly formed over the entire surface. It is formed by being laminated to form a laminated component.

FIG. 4 shows a magnetic layer forming each section data information recording section 25, a magnetic layer forming each synchronization information providing section 26, and a control information providing section 27 provided as described above. Two rectangular projections 27A and 2
7B shows an example of a signal writing system for writing a common signal to the magnetic layer in FIG. 7B.

In this example, two sections forming a section data information recording section 25, a synchronization information providing section 26, and each control information providing section 27 are formed in a portion to be the recording area section 23 of the base 21. Rectangular convex portions 27A and 27
The magnetic disk 30 provided with B is mounted on a disk table 31 and is rotated by a disk drive motor 32 at a predetermined rotation speed, for example, 3,600 rpm. For example, a write magnetic head 33 having a head width of about 1 mm is mounted on a portion of the base 21 of the magnetic disk 30 that is to be made to be the recording area 23 of the magnetic disk 30 rotated in such a manner as to be incorporated in a head slider 34 and opposed thereto. I'm sullen. Then, the head slider 34 is made to fly very slightly, for example, about 1 μ, with respect to the magnetic disk 30, and is moved in the radial direction of the magnetic disk 30 by the head driving unit 35. , A write signal Sf having a predetermined frequency, for example, about 1.2 MHz, is supplied from the signal source 36. As a result, each sectioned data information recording section 25 which is a portion of the magnetic layer provided substantially uniformly over the entire portion of the base 21 of the magnetic disk 30 which is to be the recording area portion 23. , The magnetic layer forming each synchronization information providing unit 26, and the magnetic layers in the two rectangular projections 27A and 27B forming each control information providing unit 27, over the entirety thereof. Thus, the write signal Sf is written as a common signal.

Under these circumstances, a magnetic layer forming each sectioned data information recording section 25, a magnetic layer forming each synchronization information providing section 26, and two rectangular sections forming each control information providing section 27. Writing of the write signal Sf to the magnetic layers in the protrusions 27A and 27B is completed in a relatively short time.

FIG. 5 shows a magnetic layer forming each section data information recording section 25, a magnetic layer forming each synchronization information providing section 26, and a magnetic layer provided in a portion to be the recording area section 23 of the base 21 described above. And each control information providing unit 2
7 shows another example of a signal writing system for writing a common signal to the magnetic layers of the two rectangular protrusions 27A and 27B forming the first and second semiconductor elements 7.

Also in this example, in the part where the recording area 23 in the base 21 is to be formed, the divided data information recording unit 25, the synchronization information providing unit 26, and the two control information providing units 27 are formed. The magnetic disk 30 provided with the rectangular projections 27A and 27B is mounted on a disk table 31 'and is rotated by a disk drive motor 32' at a predetermined low rotation speed, for example, about 36 rpm. Magnetic disk 3 rotated in this way
The elongated write magnetic head 37 extending in the radial direction of the magnetic disk 30 from the inner peripheral edge portion to the outer peripheral edge portion thereof is opposed to a portion to be the recording region portion 23 of the zero base 21. . Then, a write pulse signal Ps alternately having a positive and negative level having a relatively low predetermined frequency, for example, about 12 KHz, is supplied from the signal source 36 'to the elongated write magnetic head 37. You. As a result, each of the divided data information recording portions is a portion of the magnetic layer provided substantially uniformly over the entire portion of the base 21 of the magnetic disk 30 where the recording region portion 23 is to be formed. 25, a magnetic layer forming each synchronization information providing unit 26, and two rectangular projections 27A and 27 forming each control information providing unit 27.
A write pulse signal Ps is written as a common signal over the entire magnetic layer in B. In this example, the write pulse signal P from the signal source 36 '
s is also supplied to the motor control unit 38, and the motor control unit 38
Thus, the rotation speed of the disk drive motor 32 'is controlled according to the frequency of the write pulse signal Ps.

In the case of such an example, the write pulse signal Ps
Have a relatively low frequency, the elongated write magnetic head 37 can be made of a magnetic material that can be obtained at a relatively low cost. Magnetic layer, synchronous information providing unit 2
The writing of the write pulse signal Ps to the magnetic layer forming the magnetic layer 6 and the magnetic layer in the two rectangular protrusions 27A and 27B forming each control information providing unit 27 can be performed very easily.

FIG. 6 shows a magnetic layer forming each synchronous information providing section 26 provided in a portion to be the recording area section 23 of the base 21 and a control layer 2 forming each control information providing section 27. A magnetizing head used as an example of a magnetizing system for magnetizing the magnetic layers of the rectangular convex portions 27A and 27B with a common signal is shown.

The magnetized head shown in FIG. 6 has an annular flat plate portion 51 having a size corresponding to a portion to be the recording area 23 on the base 21. For example, in a portion to be the recording area portion 23 of the base 21, a contact surface portion corresponding to the control information recording area AS in each sector SN in each recording track TN, which is to be arranged in the radial direction. The magnetic pole portions 52 are arranged along the radial direction, and a coil 53 is wound around each magnetic pole portion 52 so that the magnetic pole portions 52 alternately generate N poles and S poles. Then, such a magnetizing head arranges the contact surface of each magnetic pole portion 52 so as to face the control information recording area AS arranged in the radial direction in a portion to be the recording area 23 in the base 21. When a predetermined current is supplied to each coil 53, the base 2
1, the magnetic layer forming the synchronization information providing unit 26 in each sector SN in the portion to be the recording area unit 23, and the magnetism in the two rectangular projections 27A and 27B forming each control information providing unit 27. The layers are
In accordance with the current supplied to each coil 53, that is, by a common signal, the N pole and the S pole are alternately magnetized for each sector SN.

As described above, in one example of the magnetic disk according to the present invention, in the recording area 23, the convex portion provided with the magnetic layer which is a portion of the magnetic layer forming the recording area 23 is provided. Two rectangular projections 2 formed and magnetized by a common signal or written with a common signal
Control information providing unit 27 comprising 7A and 27B
Are scanned by the reading magnetic head,
When the read magnetic head is in a proper tracking state with respect to the recording track, the read magnetic head causes the read output from the rectangular convex portion 27A and the read output from the rectangular convex portion 27B to have the same level, and When the read magnetic head is in a tracking state in which the read magnetic head is displaced toward the rectangular convex portion 27A with respect to the recording track, the read magnetic head outputs the read output from the rectangular convex portion 27A and the read output from the rectangular convex portion 27B. And the level of the read output from the rectangular convex portion 27A is made higher than the level of the read output from the rectangular convex portion 27B. When the tracking state is displaced to the position shown in FIG.
The read output from A and the read output from the rectangular protrusion 27B are generated such that the level of the read output from the rectangular protrusion 27B is higher than the level of the read output from the rectangular protrusion 27A. Therefore, the tracking servo control of the read magnetic head is properly performed based on the read output from the rectangular protrusion 27A and the read output from the rectangular protrusion 27B obtained from the read magnetic head.

[0026]

As is apparent from the above description, in the magnetic disk according to the present invention, an annular recording track is provided on a base having a central hole, and the data recording section and its associated data recording section are provided on the annular recording track. Data information recording when the control information providing unit is arranged
Unit and the control information providing unit
Annular convex part having formed blocking part and blocking part thereof
The magnetic layer is provided on the plurality of projections
Each recording track
Since it is provided as separated from the surrounding area,
Data recording section and control information providing section.
Magnetic layer is adversely affected by the etching process
The data information recording unit and the control
The information providing unit for the device can be obtained very well. And the day
Of the data recording section and control information providing section
The layer is a first portion on the annular convex portion of the magnetic layer provided substantially uniformly over a predetermined area surrounding the central hole including the portion where the annular recording track is provided on the base.
And a second portion on the plurality of protrusions,
Writing magnetized or common signal by a common signal to the second portion forming the information providing unit for Lumpur Ru made. Such magnetization of the second portion of the magnetic layer by the common signal or writing of the common signal is performed by the second portion of the magnetic layer.
Since this is performed in common for the portions, the control information providing unit is easily formed even when the annular recording track is formed with high density, so that the control information providing unit is easily formed. As a result, productivity is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining a data information recording unit and a control information providing unit in an example of a magnetic disk according to the present invention.

FIG. 2 is a plan view schematically showing an example of a magnetic disk according to the present invention.

FIG. 3 is a sectional view showing an example of a specific configuration of a control information providing unit shown in FIG. 1;

FIG. 4 is a configuration diagram illustrating an example of a signal writing system that writes a signal to an example of a magnetic disk according to the present invention.

FIG. 5 is a configuration diagram showing another example of a signal writing system for writing a signal to an example of a magnetic disk according to the present invention.

FIG. 6 is a partial plan view showing an example of a magnetizing head used in a magnetizing system for magnetizing an example of a magnetic disk according to the present invention.

FIG. 7 is a plan view schematically showing a conventional magnetic disk.

FIG. 8 is a configuration diagram for explaining a data information recording unit and a control information providing unit in a conventional magnetic disk.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Substrate 22 Center hole 23 Recording area part 25 Sectional data information recording part 27 Information providing part for control 27A, 27B Rectangular convex part
43 Magnetic layer TN Recording track SN
Sector AD data information recording area AS control information recording area

Claims (4)

(57) [Claims] 1. An annular projection formed in a disk shape having a central hole, intermittent through a blocking portion and surrounding the central hole, and a predetermined pattern in the blocking portion of the annular projection. With respect to the base on which the plurality of protrusions are formed and the base on which the annular protrusion and the plurality of protrusions are formed, a predetermined region including the annular protrusion and the plurality of protrusions is formed over the entire region. And a magnetic layer having a first portion corresponding to the annular convex portion and a second portion corresponding to the plurality of convex portions, wherein the first portion in the magnetic layer is provided. A data information recording portion is formed, and the second portion of the magnetic layer is magnetized by a common signal or a common signal is written to form a control information providing portion . Up
The plurality of protrusions among the blocking portions in the annular protrusions
Magnetic disk having a large becomes height than the surrounding portion including an outer portion, characterized in that it is provided as one which is separated from the circumferential <br/> surrounding portion. Wherein the control information providing unit, a magnetic disk according to claim 1, wherein the controller b Lumpur for information used at the time reading is characterized in that it is obtained. 3. The magnetic disk according to claim 2, wherein the information for tracking / servo control is obtained from the information providing section for control. 4. An annular convex portion and a plurality of convex portions are formed by performing etching while masking is performed on a surface of the substrate, and a magnetic layer is formed on the surface of the substrate after the masking is removed. 2. The magnetic disk according to claim 1, wherein the magnetic disk is provided.