JPS5963006A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording and reproducing device which is small-sized and light, is excellent in recording sensitivity and is capable of high density recording by placing a main magnetic pole and an auxiliary magnetic pole on the side of a recording layer of a recording medium, so that the main magnetic pole is energized by the auxiliary magnetic pole through a high magnetic permeability magnetic layer. CONSTITUTION:A main magnetic pole 1 and an auxiliary magnetic pole 2 are placed on the side of a magnetic recording layer 21 of a recording medium 20. The recording medium 20 is constituted of a magnetic recording layer 21 having a vertical anisotropy, a high magnetic permeability magnetic layer 22 of ''Permalloy'', etc. having a horizontal anisotropy, and a substrate 23, and the magnetic recording layer 21 is formed on the high magnetic permeability magnetic layer 22 by means of sputtering, etc, and is constituted and places to that the magnetic recording layer is not formed on one part of the recording medium, the high magnetic permeability magnetic layer 22 is exposed, and the auxiliary magnetic pole 2 is made to contact directly to the high magnetic permeability magnetic layer 22 or is made adjacent to the latter. Accordingly, a recording signal converted to a magnetic flux by an energizing winding 3 wound round the auxiliary magnetic pole 2 is absorbed to the main magnetic pole 1 through the high magnetic permeability magnetic layer 22 and the magnetic recording layer 21, and in that case, recording is executed magnetically to the magnetic recording layer 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording intergeneration device for recording and reproducing information such as images on a recording medium of d-size, and perpendicular magnetic recording is performed on a perpendicular magnetic recording medium having an axis of easy magnetization in the direction of force perpendicular to the film surface. The present invention relates to a magnetic recording main device that performs recording and reproduction using a magnetic recording method.

As is well known, conventional magnetic recording and reproducing devices use a so-called ring-shaped magnetic head, in which a magnetic core with a magnetic guing is wound around a magnetic core. 2. Description of the Related Art A horizontal magnetic recording type apparatus is known that performs recording and reproduction on a recording layer of a horizontal magnetic recording medium having a horizontal axis of easy magnetization. As is well known, in the production of this glaze, it is difficult to increase the recording density in the running direction of the recording medium due to the self-demagnetizing effect of the recording medium and the addition of demagnetizing effects due to adjacent magnetization.

In response to this, in recent years, a so-called perpendicular magnetic recording system has been proposed in which the recording medium has a perpendicular 'OB' easy axis. According to this method, 1l-1 JP-A-52-13470
As described in No. 6, it has excellent recording characteristics for short wavelengths, and together with the improvement in recording density in the running direction of the recording medium by reducing the track width, it enables extremely high-density recording. It is possible to relatively reduce the size of the recording medium required to record the same amount of information compared to the conventional method.

As a conventional magnetic recording/reproducing device using this perpendicular magnetic recording method, one using a magnetic recording/reproducing head as shown in FIGS. 1(,) to (C) has been proposed.
) is made of a high magnetic permeability magnetic material, and a winding 3 is applied to the main pole 1 which is placed in contact with the recording layer 11 of the perpendicular magnetic recording medium 10. Figure 1 (b) shows a magnetic field created by the auxiliary magnetic pole 2, which is placed opposite the main magnetic pole 1, sandwiching the perpendicular magnetic recording medium 1O (hereinafter referred to as the recording medium). ! j! , 1 is an auxiliary magnetic pole excitation type head. In addition, the head shown in FIG. 2C is called an image type head in which a high permeability magnetic material 6 is closely attached to the back side of the recording medium 10 to improve the recording density by an image effect or the like.

Comparing these heads, it is known that the auxiliary magnetic pole excitation type head shown in Figure (b) has excellent recording sensitivity as well as the image type head, but these heads have the following structural problems. There is.

For example, there are few problems with fixed disks that do not require replacement of the recording medium, but with electronic cameras and V1'
For a portable device like the R device, miniaturization and weight reduction are the most important issues, and recording media must be replaced frequently. Therefore, in a structure such as an auxiliary pole excitation type head in which the main pole 1 and the auxiliary pole 2 are arranged facing each other with the recording medium 10 in between,
Space is required to arrange these, and the mechanism for exchanging the shredded recording medium 10 is complicated, making the entire device large and unsuitable for portable magnetic distribution and playback. It is. The same applies to the image type head in this regard.

Furthermore, when using a double-sided recording medium, two sets of main and auxiliary magnetic poles are required, one for the A-plane phase of the medium (for the interface) and the other for the 3-plane phase (for the back surface), which increases both volume and cost. There is an intermission. Furthermore, when recording several tracks with a conventional auxiliary pole excitation type head, it is necessary to move one or two magnetic poles while maintaining the relative positional relationship between the two magnetic poles, the main pole and the auxiliary pole. This not only makes the mechanism complicated, but also makes it extremely difficult to implement multiple heads in perpendicular magnetic recording. In addition, when recording on the counting track, it is possible to use a method in which only the main magnetic pole 1 is movable and a large fixed auxiliary magnetic pole that covers all the recording tracks. This method cannot be adopted because of the deterioration of frequency characteristics during recording and reproduction and the inability to create a uniform magnetic field for all recording tracks.

Additionally, a method was proposed in which the main magnetic pole and the auxiliary magnetic pole were integrated and placed on the same side of the recording medium, as described in JP-A-56-1.1612 or JP-A-56-3422. However, this method has drawbacks such as the structure of the head itself being complicated, and the actuator becoming larger to move both the main and auxiliary magnetic poles, making the head itself larger and making it difficult to create multiple heads. It had

The present invention has been made to solve the above problems and realize a recording/reproducing device using a perpendicular magnetic recording method. The purpose is to recommend the device.

In order to achieve the above object, the present invention forms a high magnetic permeability magnetic layer having a horizontal easy axis of magnetization under a recording layer of a recording medium having a vertical easy axis of magnetization, and forms a main magnetic pole and an auxiliary magnetic pole. is arranged on the recording layer side of the recording medium, and the main magnetic pole is excited by an auxiliary magnetic pole through a high permeability magnetic layer.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

2 to 14 are views showing one embodiment of the present invention, and the same parts in each figure as in FIG. 1 are given the same reference numerals.

FIG. 2 is a diagram showing the configuration of an auxiliary magnetic pole excitation type head and a recording medium according to an embodiment of the present invention.
It is located on the J side. The recording medium 20 is composed of a (ho) magnetic recording layer 2 having perpendicular anisotropy, a high permeability magnetic layer 22 such as permalloy having horizontal anisotropy, and a substrate 23. On top of the magnetic permeability layer 22,
The magnetic recording layer is not formed on a portion of the recording medium, the high permeability magnetic layer 22 is exposed, and the auxiliary magnetic pole 2 is directly attached to the high permeability magnetic layer 22. The arrangement is such that they are in contact or close to each other.

Therefore, the recording signal converted into magnetic flux by the excitation winding 3 wound around the auxiliary magnetic pole 2 is transmitted through the high permeability magnetic layer: 2
2. The light is absorbed into the main pole 1 through the magnetic recording layer 21, and recording is performed magnetically on the magnetic recording layer 21 at this time.

Next, an embodiment in which the recording medium 2o in the above embodiment is a disk-shaped recording medium, a so-called disk, will be described with reference to FIGS. 3 to 5.

FIG. 3 shows an example in which an exposed region of the high permeability magnetic layer 22 is provided on the outer periphery of the f-isk, and FIG. 4 shows an example in which an exposed region of the high permeability magnetic layer 22 is provided on the inner periphery of the dinuk. be. In either case, the main magnetic pole 1 is connected to the disk-shaped recording medium 2 as shown by the arrow.
perpendicular magnetic recording is performed on multiple tracks or a continuous spiral trunk.

``Furthermore, Figure 5 shows the case where an exposed area of high magnetic permeability magnetic field (low tide 22) is provided in the outer and inner circumferential parts of the disk, and recording is performed using two auxiliary magnetic poles 2A and 2B for one master @L1. 6D, in this case two auxiliary magnetic poles 2,
The magnitude of the recording magnetic field between the 2Bs is kept constant regardless of the position, and there is no need to perform electrical signal processing during recording and reproduction.

Incidentally, in each of the above embodiments, vertical magnetic recording? As the Jr raw head, a main and auxiliary magnetic pole simultaneous excitation type head as shown in FIG. 6 may be used.

Next, an example in which the main magnetic pole I and the auxiliary magnetic pole 2 are made magnetically conductive by a guide made of magnetic control is shown in FIGS.
This will be explained with reference to FIG. 9.

FIG. 7 shows a case where the embodiment is applied to the embodiment shown in FIG. It extends towards.

For example, if a groove is provided in the longitudinal direction of the moving guide 7 and the main magnetic pole 1 moves in the groove while being in contact with the guide, one end of the main magnetic pole 1 can be moved as shown by the arrow during recording. Since the path A is formed, highly efficient and highly sensitive recording and reproduction is possible. Furthermore, FIG. 8 shows a case where the embodiment is applied to the embodiment shown in FIG. Similar to the figure, closed magnetic paths A and B are formed, respectively.

FIG. 9 shows a case where the main magnetic pole 1 and the auxiliary magnetic pole 2 are made magnetically conductive by using a bellows containing a magnetic fluid inside instead of the moving guide 7. As shown in the figure, a main magnetic pole 1 and an auxiliary magnetic pole 2 are respectively fixed at both ends of a bellows 8 filled with magnetic fluid 9. 7 and 8 in the radial direction on the magnetic recording layer 21.
A closed magnetic path A is formed as shown in the figure.

Next, an embodiment in which multi-track recording is performed on the recording medium 20 using a plurality of sets of main magnetic poles 1 and auxiliary magnetic poles 2 will be described with reference to FIG.

Figure 10 shows the case where recording is performed on two tracks. In this case, there are two auxiliary magnetic poles for the main pole IA, and 2B for the main magnetic pole IB, and these are the two sets of magnetic recording records. It constitutes a head pair. That is,
As shown in the figure, the manager W! IA and IB are supported by the support member 10 with a constant interval maintained at all times, and the main magnetic poles IA and IB are attached to the magnetic recording layer 21 of the recording medium 20 with the same interval maintained between them, 21B. By moving radially over the! 1l12 recording tracks are formed. For example, when the main magnetic pole IA starts recording from the outer circumference side of the recording medium J4, the main magnetic pole IB starts recording from the innermost circumference side of the recording medium.

At that time, the magnetic flux from the two auxiliary magnetic poles is transferred to the magnetic recording layer 21k from the permeability magnetic layer. ,? Perpendicular magnetic recording is performed by absorbing A through the main magnetic pole. On the other hand, perpendicular magnetic recording is performed in the magnetic recording layer 21B by the magnetic flux generated by the auxiliary magnetic pole 2B passing through the high permeability magnetic layer 22B and being absorbed by the magnetic layer %IB. Note that the high permeability magnetic layer 22A.

22B and the magnetic recording layer 21, 21B are magnetically separated from each other, and there is no adverse effect due to crosstalk between mutual magnetic fluxes.

Next, connect the disk hub of the recording medium 20 to the auxiliary magnetic pole 2,
Figs. 11 to 14 for examples when used as part of the
This will be explained with reference to the figures.

FIG. 11 is a diagram showing a case where the disk hub of the recording medium 20 and the auxiliary magnetic pole are integrated, and is a partially enlarged view of FIG. 12d. As shown in the figure, the disk hub 24 consists of a magnetic part 25 and a non-magnetic part 26, and the magnetic part 25 has a joint part 27 mixed with magnetic powder, for example, to allow the recording magnetic flux to pass smoothly. It is connected to the high permeability magnetic layer 22 using a plastic magnet, magnetic fluid, or the like.

Therefore, the winding 3 provided on the magnetic portion 25 of the disk hub 24 functions as the auxiliary magnetic pole 2. The non-magnetic portion 26 of the disk hub 24 is intended to prevent the influence of leakage magnetic flux caused by a morph (not shown) that rotates the recording medium 2θ.

FIG. 13 is a diagram showing the case where the upper part of the disk hub is part of the auxiliary magnetic pole, and FIG. 14 is a partially enlarged view thereof. In this case, the magnetic part 25 constituting the upper part of the disk hub and the auxiliary magnetic pole 2 may be brought into smooth contact with each other, and a magnetic fluid may be filled in the gap therebetween to maintain magnetic continuity.

In each of the embodiments described above, the recording medium 20
This is realized by utilizing the high magnetic permeability magnetic layer 22 of the main magnetic pole 1 and the auxiliary magnetic pole 2 as a magnetic guide path.
There is concern that the permeance (ease of passage of the Ni1B flux) will decrease as the distance between the auxiliary magnetic pole 2 and the auxiliary magnetic pole 2 increases. However, in this device, for the reasons stated below:
The decrease in mianance can be minimized. That is, firstly, since the main magnetic pole 1 and the auxiliary magnetic pole 2 are in a magnetically conductive state via the two-dimensionally expanding high permeability magnetic layer 22, the cross-sectional area of the portion forming the magnetic path is relatively small. It is possible to increase the 74-meance by making the film surface thicker.

Second, in this device, the auxiliary magnetic pole 2 can be brought into direct contact with or close to the high permeability magnetic layer 22, so that the permeance can be improved.

Note that -) In each of the two consecutive embodiments, a case has been described in which a disc-shaped recording medium is used as the recording medium, but the present invention is not limited to the above-mentioned embodiments. Can also be applied to magnetic recording tape,
Various modifications can be made within the scope It(1) without departing from the gist thereof.

As explained above, the present invention has the following effects.

(1) A high permeability magnetic layer with a horizontal axis of easy magnetization is formed below the magnetic recording layer of the recording medium, and the main magnetic pole and auxiliary magnetic pole are placed on the magnetic recording side, so the recording medium is sandwiched in the structure. Since there is no need to use a head drive unit and the head drive unit can be disposed on only one side of the medium, the structure of the drive unit can be simplified and a magnetic recording/reproducing device with a small group of images can be obtained.

(2) By arranging the main magnetic pole and the auxiliary magnetic pole on the same side with respect to the recording medium, and by making the auxiliary magnetic pole a fixed structure, head touch can be achieved when the disk-shaped recording medium is stored in a cassette-shaped container. The mechanism of the joint part roars.

(3) Since only the main magnetic pole moves when the head tracks the recording medium, and the auxiliary magnetic pole is fixed, the head drive unit can be made smaller and lighter.

[Brief explanation of the drawing]

Figures 1(a) to 1(c) are diagrams showing the configuration of a conventional collapsing magnetic recording head, in which Figure 1(a) is a configuration diagram of a main pole excitation type head, and Figure 1(b) is an auxiliary pole excitation type head. The block diagram of the mold head, the same figure (c) is the block diagram of the image mold head.
4 are diagrams showing embodiments of the present invention, FIG. 2 is an explanatory diagram showing a (J4 arrangement) of a perpendicular magnetic recording/reproducing head and a recording medium, and FIGS. FIG. 3 is an explanatory diagram showing an example in which a high permeability magnetic layer 71 exposed area is provided on the circumferential side of the disk; A total of 1 clear drawing showing an example in which the exposed area is provided on the ``inner circumferential side of the isk'', 5th [ff1l
An explanatory diagram showing an example in which the same travel areas are provided on the outer and inner circumferential sides of the N-type disk, FIG. 6 is an explanatory diagram showing the case where a main and auxiliary magnetic pole simultaneous excitation type head is applied, and FIG. 7 - Figure 9 is a diagram showing an embodiment in which 1n main magnetic quaternary table auxiliary magnetic pole is made magnetically conductive by a magnetic support body, and Figure 7 is an explanatory diagram showing a case where it is applied to the embodiment of Figure 3. , FIG. 8 is an explanatory diagram showing a case where the embodiment is applied to the embodiment shown in FIG. 5, FIG. 9 is an explanatory diagram showing a case where the magnetic support body is made of a bellows, and Figure 10 is an explanatory diagram showing a case where the magnetic support member is made into a bellows. Theory HJ1 diagram showing an example of the case,
Figures 11 to 14 are diagrams showing an embodiment in which the disk hub has sleeve I'IJj magnetic poles, and Figure 11 is an explanatory diagram showing an embodiment in which the disk hub and the auxiliary magnetic pole are integrated.
Fig. 12 is a partially enlarged view of Fig. 11, Fig. 13 is an explanatory view showing an embodiment in which the upper part of the disk is part of the auxiliary magnetic pole, and Fig. 14 is a partially enlarged view of Fig. 13. It is. 1. Main magnetic pole, 2.. Auxiliary magnetic pole, 3.. Winding wire, 7..
Movement guide, 8... Bellows, 9... Magnetic fluid, 2
θ...Recording medium, 21...Magnetic recording layer, 22...High permeability magnetic layer, 23...Base, 24...Disk...
Bu. Applicant's representative Patent attorney Takehiko Suzue Figure 1 (a) Figure 2 Figure 3 Figure 4 Figure 45 Figure 6 Figure 7 Figure 8 Figure 3Δ Figure 9 Figure 11 Figure 13 Figure 1114 Procedure amendment November 1, 1972 Director-General of the Patent Office Kazuo Wakasugi 1, Indication of the case, Patent Application No. 174422/1983, 2, Title of the invention: Magnetic recording reciprocating device 3, Person making the amendment, Relationship with the case, Patent applicant ( 037) Full text of the gradient specification of Olin, OS Optical Industry Co., Ltd. 4, Agent 6, Supplement 11-

Claims (6)

[Claims] (1) A magnetic recording layer of a perpendicular magnetic recording medium that has a main magnetic pole made of a high permeability magnetic material and an auxiliary magnetic pole that excites the main magnetic pole, and has an axis of easy magnetization perpendicular to the film surface. In a magnetic recording and reproducing device that performs recording and reproducing, a high permeability magnetic layer having an axis of easy magnetization in the horizontal direction is formed below the magnetically isolated recording layer of the perpendicular magnetic recording medium, and the main magnetic pole and the auxiliary magnetic pole are arranged in the perpendicular direction. 1. A magnetic recording and reproducing device, wherein the main magnetic pole is arranged on a magnetic recording layer side of a magnetic recording medium, and the main magnetic pole is excited by the auxiliary magnetic pole through the high permeability magnetic layer. (2) The perpendicular magnetic recording medium has the high magnetic permeability magnetic material layer (1) publicly exposed, and the auxiliary magnetic cedar mentioned above is placed in contact with or close to the exposed portion of the high magnetic permeability magnetic layer. A magnetic recording and reproducing device according to item (1) of the feature list. (3) The auxiliary magnetic pole is different from the main magnetic pole on the single side,
Scope of patent application characterized by multiple thin film gaps (1)
The magnetic recording and reproducing device described in . (4) The magnetic recording and reproducing device according to item (1) of the patent claim, wherein the main magnetic pole and the auxiliary magnetic pole are connected to a magnetic support member to form a closed magnetic path together with the perpendicular magnetic recording medium. (5) The perpendicular magnetic recording medium is a disc-shaped perpendicular magnetic recording medium having a disk hub at the center of rotation. The magnetic recording and reproducing device of the software. (6) The disk hub is made of a magnetic material and has a front B
A magnetic recording/reproducing apparatus according to claim 5, characterized in that the magnetic layer is magnetically conductive with the high magnetic permeability magnetic layer and also serves as the auxiliary magnetic sand.