JPS6069812A - Vertical magnetic recording device - Google Patents

Abstract

PURPOSE:To reduce drop out and data error in case of data recording and reading by constituting a device so that each main magnetic pole and an auxiliary magnetic pole face each other with each recording carrier between them through a window part and an aperture part provided in a jacket. CONSTITUTION:Recording carriers 10A and 10B are so piled up that forming faces of vertically magnetized films 12A and 12B are inside, and they are stored in a jacket 30, whose inside face is provided with a proper liner 21, in this state. A liner 22 which has a function as a spacer and consists of rayon or the like is arranged between recording carriers 10A and 10B to make a prescribed gap (l) between recording carriers 10A and 10B. Apertures for access of main magnetic poles are provided in the part of a side OP of the jacket 30, and window part WD are provided on both faces, and the auxiliary magnetic pole which should face the main magnetic pole of a vertical magnetic head access recording mediums 10A and 10B through these window parts WD in case of actual data recording or reproducing to or from these mediums.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a perpendicular magnetic recording device that employs a perpendicular magnetic recording method to record and reproduce signals, and particularly when a flexible disk medium is used as the recording medium. The present invention relates to a preferred structure of a perpendicular magnetic head and implementation of the root problem of access to the recording medium by the head.

[Prior art]

FIG. 1 shows the structure of a floppy disk commonly used today.

As shown in the figure, this floppy disk has a structure in which a recording carrier l having an appropriate magnetic film on both sides is housed in a rectangular jacket 3VC with a liner 2 made of cloth or the like on the inside. Through a window portion WD provided in a part of this jacket 3 as shown in the figure, data is recorded on and read from the recording carrier l by the air head. , FIG. 1('b) is an enlarged sectional view of the circle P indicated by the dashed line in FIG. 1(a).

The perpendicular magnetic recording system is a system that attempts to perform K magnetic recording in the "thickness direction" of the record carrier 1 as described above, and enables high-density recording that breaks the theoretical limits of conventional magnetic recording systems. This is a magnetic recording method that has been actively researched and developed in recent years. Recording media used in the same method,
That is, if a perpendicular magnetic recording medium were to be made into a disk, it is thought that the structure would be similar to the structure of the floppy disk shown in FIG.

However, the floppy disk shown in FIG. 1 does not necessarily have a perfect structure. For example, there are fundamental structural problems that cannot be solved yet, such as the tendency for dirt and dust to enter through the window portion WD mentioned above. If dirt or dust enters and adheres to the magnetic film surface of the record carrier 1, phenomena such as dropouts and data errors are likely to occur during data recording and data reading, and the magnetic This will significantly impair the reliability of the recording device.

Such problems are more serious in the perpendicular magnetic recording method which attempts to record data at high recording carrier pressure density as described above, and drastic measures are required to realize this.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a perpendicular magnetic recording apparatus that can solve the above-mentioned problems and perform highly reliable and stable perpendicular magnetic recording and reproduction.

[Structure of the invention]

In this invention, when an auxiliary magnetic pole excitation type head is used as a perpendicular magnetic head, the auxiliary magnetic pole around which the excitation coil (read/write coil) is wound does not need to be brought into direct contact with the magnetic film of the record carrier (and this auxiliary magnetic pole is not required to be in direct contact with the magnetic film of the record carrier). Focusing on the fact that the magnetic pole itself is extremely insensitive to dirt and dust, we developed two disk-shaped record carriers with a magnetic film, or perpendicular magnetization film, on only one side.
Perpendicular magnetic recording media are used in which the perpendicular magnetic recording media are stacked one on top of the other and housed in a jacket so that the surface on which the perpendicularly magnetized film is formed faces inside. This jacket is provided with a window portion for accessing the above-mentioned auxiliary magnetic pole to the record carrier, and an opening portion through which the main magnetic pole can be inserted between these two record carriers, and these window portions are provided. The structure is such that each main magnetic pole and auxiliary magnetic pole face each other with each of the record carriers sandwiched therebetween through the opening. In addition, in practice, the tip of the holder that holds the main magnetic pole should be shaped into a sharp wedge shape (with respect to the sliding direction), so that the main magnetic pole can be inserted easily and reliably between the carriers mentioned above. It is desirable that the above recording medium 2.
If a suitable liner functioning as a spacer is placed between the recording carriers to maintain a constant distance between the recording carriers, the insertion of the main magnetic pole between the recording carriers becomes more reliable.

〔Effect of the invention〕

Therefore, according to the perpendicular magnetic recording device of the present invention, even if dust or dirt adheres to the -C record carrier through the window portion, the perpendicular magnetic recording device works with the main magnetic pole and directly contributes to recording and reproducing data. The perpendicularly magnetized film surface of the recording carrier is always maintained in a clean state. For this reason, the reliability of the recording medium and recording apparatus is significantly increased by +n+, and stable perpendicular magnetic recording and reproduction can be performed over a long period of time.

In addition, in this invention, although the structure of the perpendicular magnetic recording medium in the form of a disk is capable of recording on two sides, the main magnetic pole and the auxiliary magnetic pole each have one perpendicular magnetic film (magnetic Because they are combined, there is no problem of backside crosstalk, which has been a concern in the past.

〔Example〕

FIG. 2 shows an example of a perpendicular magnetic recording medium used in the present invention. However, in the tF12 diagram, Fig. 2(a) is a plan view of the disk medium, and Fig. 2(b) is an enlarged cross-sectional view of the circle P of the disk medium indicated by the dashed line in Fig. 2(a). It is.

As shown in FIG. 2, this disk medium has cobalt (
CO]-perpendicularly magnetized film 12 made of chromium (Or) alloy, etc.
Two record carriers 10A and I with A and 12B
OB, and these record carriers 10A and JOB
are housed in a jacket 30 having an appropriate liner 21 on the inner surface, with the perpendicularly magnetized films 12A and 12B placed on top of each other so that the surfaces on which the perpendicularly magnetized films 12A and 12B are formed are on the inside. Note that a liner 22 made of rayon or the like, which functions as a spacer, is placed between the record carrier 10A and the IOB (see FIG. 2(a)). The pressure is 5K so that a predetermined gap l (see FIG. 2(b)) is formed. This is a consideration to ensure that the main magnetic pole, which will be described later, can easily and reliably access between these recording carriers 10A and 108. An opening for accessing the main magnetic pole is provided in a portion OP in the side view of the jacket 30.

In addition, window portions WD are provided on both sides of this jacket 300 as shown in the figure, and during actual data recording or reproduction on the same medium, the auxiliary magnetic pole that faces the main magnetic pole of the perpendicular magnetic head is placed in this window. The respective record carriers 10A and IOB are accessed via the section WD.

Next, a method for recording data on the disk medium and reproducing data from the disk medium using the perpendicular magnetic recording apparatus according to the present invention will be described with reference to FIGS. 3 to 5. However, in FIG. 3, FIG.
FIG. 3(b) is a sectional view taken along the line Q--Q shown in FIG. 3(a).

FIG. 4 shows the head structure of the perpendicular magnetic recording apparatus according to the above embodiment, and FIG. 5 shows an example of a control circuit for selectively controlling access of the auxiliary magnetic pole of the head to the disk medium.

First, the main structure and head structure of the perpendicular magnetic recording apparatus of this embodiment will be explained with reference to FIGS. 3 and 4.

As shown in these figures, the head of the device has a main magnetic pole 51A and 51B made of a soft magnetic thin film such as a nickel (N1)-iron (Fe) alloy, held between a non-magnetic holder 52. Magnetic pole block 50 and the main magnetic pole 51
An auxiliary magnetic pole block 60A cooperates with the main magnetic pole 51B to record data on the record carrier 10A and read data from the record carrier 10A, and an auxiliary magnetic pole block 60A cooperates with the main magnetic pole 51B to record data on the record carrier 10B and read data from the record carrier 10A. The auxiliary magnetic pole block 60 serves as a trap for reading data from the carrier 10B.
It consists of three blocks B, and in the same device, each of these blocks is connected to a main pole block support arm 53.
, K is supported as shown in the figure by auxiliary magnetic pole block support mechanisms 70A and 70B.

In addition, in detail, each of the above-mentioned auxiliary magnetic pole blocks 60A and 6
0B includes auxiliary magnetic poles 61A and 61B made of a high permeability magnetic material such as ferrite, each having a sufficient thickness compared to each of the main magnetic poles 51A and 51B, and is wound around each of these auxiliary magnetic poles 61A and 61B. Excitation coil 6
2A and 62B, and non-magnetic holders 63A, 63B and K that integrally hold the above-mentioned auxiliary magnetic pole and excitation coil for each block, and these auxiliary magnetic pole blocks 60A and 60
Each of the auxiliary magnetic pole block support mechanisms 70A and 70F3 supporting the auxiliary magnetic pole blocks 60A and 60B has a support arm 71 that is fixed to and directly supports these auxiliary magnetic pole blocks 60A and 60B.
A and 71B and coils 73A and 73B, respectively.
These support arms 71A and 71Bfa: Arm drive mechanisms 72A and 7 extend and contract in the manner shown by arrows 71 and F2 in the figure based on a predetermined electric signal applied to the support arms 71A and 71Bfa.
2B, and a support arm 74A that supports these arm drive mechanisms 72A and 72B, respectively, as shown.
and 74B. In this apparatus, when accessing a disk medium as shown in FIG. 3, the support arms 74A and 74B and the main pole block support arm 53 are integrally moved by a stepping motor (not shown) and the main pole block support arm 53 as shown in the figure. The main magnetic pole 51A and the auxiliary magnetic pole 61A, as well as the main magnetic pole 51B and the auxiliary magnetic pole 61B, slide when performing track selection on the record carrier 10A or IOB. We are always able to maintain a face-to-face relationship.

In addition, the tip of the main pole block 50 (non-magnetic holder 52) is finished in a sharp shape as shown in FIGS. 3(b) and 4. When the main magnetic pole block 50 is inserted through the above-mentioned opening OP of the disk jacket 30, the main magnetic pole block 50 easily and reliably connects the two record carriers 10A.
and IOB to be accessed between them.

Next, referring to FIG. 5, the above-mentioned auxiliary magnetic pole block 60
The operation related to the expansion/contraction drive of A and 60B, that is, the operation related to selecting the record carrier 10A or IOB will be explained.

In this embodiment device, the arm drive mechanisms 72A and 72B correspond to, for example, a solenoid whose movable iron core is a part of the support arms 71A and 71B, respectively, or the sliding movement of a cylinder piston based on the opening and closing of an appropriate electromagnetic valve. The same known f
[Constructed by K. Furthermore, the support arm 71A described above is based on the head select signal He and head load signal HL applied from a control circuit (not shown).
and 71B, and transmits them to the arm drive machines 6''#72A and 72B via the lead wires of the coil 73A and the lead wire of the coil 73B, respectively. For example, as shown in FIG. 5, the head select circuit 80 receives the above-mentioned head select signal H8 applied to the terminals T1 and T2, respectively, and the node load signal HL, and performs the AND circuit 811. The switching transistor 82 turns on under the condition that the output of the AND circuit 8 becomes a "high level" logic level, and receives the head select signal H8' ((a signal logically inverted by the inverter 83 and the head load signal HL). and an AND circuit 84 which takes the logical product, and the output of the AND circuit 84 is at the logic level "
The electric energy input terminal of the arm drive mechanism 72A is connected to the head select circuit 800 through the lead wire of the coil 73A. The electric energy input terminal of the other arm drive mechanism 72B is connected to the DC power terminal T3 of the head select circuit 80 and the collector terminal T4 of the switching transistor 82 through the lead wire of the coil 73B. The collector terminal T61C of the switching transistor 85 is connected.

Therefore, now the head load signal HL is "fans".
e ” f 7: Cb Chi theory Q level 1 high level”
If this is the case, the output logic level of the AND circuits 81 and 84 will be both the logic level of the head select signal H8 and the logic level of the head select signal H8 (1)1), and therefore the arm drive mechanisms 72A and 72B will also be both non-operational. active and retracting support arms 71A and 71B, respectively, i.e. auxiliary pole blocks 6 (IA and 60B).
is kept separate from the record carrier 10A and the IOB.

Next, the head load signal I (L IJ's true
e "-f, that is, the logic level is 10-level", and the head select signal Is at this time is the logic level "
If it is "low level", then the above AND circuit 81
Out of the AND circuits 84, only the output logic level of the AND circuit 81 becomes 1 high level, so the switching transistor 82 is turned on and only the arm drive mechanism 72A of the arm drive mechanism grooves 72A and 72B becomes active.

As a result, the Arno driver @721> extends the support arm 71A and moves the auxiliary magnetic pole block 6 so that the head surface of the auxiliary magnetic pole block 60A presses the recording carrier 10A.
0A is brought into contact with the record carrier 10A.

Also, when the head load signal HL is "'true", the head select signal HB is at a logic level of 6 no.
If the signal is "6 NOI", contrary to the above, only the output logic level of the AND circuit 84 becomes "6 NOI level", and only the other arm drive mechanism 72B becomes active. That is, in this case, the auxiliary magnetic pole block 60B comes into contact with the record carrier 10B in a manner similar to that described above.

In this way, by employing a mechanism that presses the corresponding auxiliary magnetic pole blocks onto the record carrier to be accessed, contact between the perpendicularly magnetized film surface of the record carrier and the main magnetic pole can be ensured. , efficient perpendicular magnetic recording and reproduction are realized.

Now, in this device, the perpendicular magnetic head slides as indicated by the arrow FO to access the disk medium of the above-described embodiment in the manner shown in FIGS. 3(a) and 3(b). One of the auxiliary magnetic pole plotters corresponding to one of the record carriers extends as indicated by the arrows F1 or F2 and comes into contact with the record carrier in the manner described above, thereby recording data on or from the record carrier. The data can now be played back.

Now, if the selected record carrier is the carrier 10A, the device will set the data recording trap to this carrier 10A.
The main magnetic field generated by exciting the auxiliary magnetic pole 61A by applying an appropriate electric signal corresponding to the data desired to be recorded to the excitation coil 62A via the lead wire 64A (see Fig. 4) of the auxiliary magnetic pole block 60A brought into contact with 0tlC. The magnetic layer (perpendicularly magnetized film) 1 of the carrier 10A due to the strong perpendicular magnetic field of the magnetic pole 51A
2A, and when reproducing data, the magnetic flux of the main magnetic pole 51A generated by the perpendicular magnetic field of the magnetic layer 12A of the carrier 10A is induced to the auxiliary magnetic pole 61A, and this is further converted into an electric signal by the excitation coil 62A. and play the data. The same applies to the record carrier 10B.

Note that in the disk medium described above, each record carrier 10
The packaging and material of A and the IOB themselves are arbitrary, as long as they have a structure that satisfies the function of a so-called perpendicular magnetic recording medium (* indicates the material).

Furthermore, the structure of the perpendicular magnetic head is not limited to the one shown in FIG. 4, and can be of any structure as long as the main magnetic pole and auxiliary magnetic pole, which work together, can face each other while sandwiching a record carrier. good. For example, in FIG. 4, the main magnetic poles 51A and 51B in the main magnetic pole block 50 may be arranged so as to be shifted back and forth relative to one direction of rotation of the record carrier yA and FB. The block 50 can now be made thinner.

Furthermore, it is easy to modify the above-mentioned disk medium and perpendicular magnetic recording device to single-sided recording/reproduction. The packaging may omit the magnetic pole block, and the window portion WD of the jacket 30 may be provided only on one side where the auxiliary magnetic pole is arranged.

[Brief explanation of the drawing]

FIG. 1 is a plan view and a partial sectional view showing conventional floppy disk packaging; FIG. 2 is a plan view and a partial sectional view showing an example of the construction of a perpendicular magnetic recording medium used in the present invention;
The figure shows an example of a perpendicular magnetic recording device according to the present invention; a plan view and a sectional view showing how the recording medium shown in FIG. 2 is accessed by the apparatus; FIG. 4 shows an embodiment shown in FIG. FIG. 5 is a perspective view showing packing of the head of the perpendicular magnetic recording device, and FIG. 5 is a circuit diagram showing an example of the head select circuit of the embodiment perpendicular magnetic recording device shown in FIG. 1. IOA, IQB...Record carrier, IIA, JIB...
...Nonmagnetic substrate, 121.12B...Perpendicular magnetization film, 2
, 21.22...liner 1sf, E'i -a o
”・Jacket, WD...Window part, OP...
・Opening, 50...Main pole block, 51At51B
...Main magnetic pole, 52...Holder, 53...Main magnetic pole block support arm, 60At60B...Auxiliary magnetic pole block, 61A, 61B...Auxiliary magnetic pole, 62At62B
...Exciting coil, 63A, 63B...Holder, 64
At64B...Coil lead wire, 7ohp7oB...
・Auxiliary magnetic pole block support mechanism, 71 people, 71B, 74A
*74B...Support arm, 72A#72B...Arm drive mechanism, 73A, 73B...Solenoid coil,
80...Head select circuit, 81°84...AND circuit, 82.85...Switching transistor,
83...Inverter Figure 1 (O) Figure 2 0 (b) Figure 3 (b)

Claims (2)

[Claims] (1) Perpendicular magnetic recording using a recording medium in which two disc-shaped record carriers each having a perpendicular magnetization film formed on one side are stacked so that the surface on which the perpendicular magnetization film is formed faces inside. A perpendicular magnetic recording device for reproducing, comprising two main magnetic poles that come into direct contact with the perpendicular magnetization films of the two record carriers, and a holder of 5 for integrally holding these main magnetic poles. , a perpendicular magnetic field comprising two auxiliary magnetic poles which are arranged to be paired with each of the main magnetic poles via the record carrier, and a mechanism for integrally moving these auxiliary magnetic poles and the holder in the track direction of the record carrier. Recording device. (2) The perpendicular magnetic recording device according to claim (1), wherein the holder has at least one end facing toward the center of rotation of the record carrier having a wedge shape.