JPS5858557A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To develop and copy magnetic records having high resolving powder by providing a horizontal magnetized layer having small coercive force on one surface of substrate, providing a vertical magnetized layer of large coercive force on the other surface, and using a ring head for the horizontal magnetized layer. CONSTITUTION:A ''Permalloy '' layer having small coercive force is provided by sputtering on one surface of a copper plate 1 which is non-magnetic substrate to form a horizontal magnetized layer 2. A vertical magnetized layer 3 consisting of Fe-Tb having large coercive force is provided on the opposite surface, whereby an endless belt of a magnetic recording medium is obtained. If a magnetic ring head 4 is disposed on the surface of the layer 2 and information is written by applying signal pulses, part of the layer 2 inverts in magnetism. Magnetic fluxes are generated like dotted lines to invert the magnetism in part of the layer 3, by which the toner B contg. magnetic powder is attracted and developed. In this case, an external magnetic field is applied, and the use of a heater 5 is equally well. The toner B on the layer 2 is transferred and fixed onto paper 8 by a transfer corona charger 7, whereby a copied picture is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel magnetic recording medium having a two-layer structure of a horizontal magnetization layer for magnetic recording and a perpendicular magnetization layer for magnetic toner development.

The recording method that has been used for the past 40 years is called ``longitudinal (horizontal) recording,'' in which electrical signals as information are recorded in the horizontal direction of the tape magnetic layer using a ring-shaped magnetic head. This is the principle.

・K, who is proceeding with research on the Naoki Kama method. Therefore, it has become clear that this method is extremely easy to record at high density, and that the rounding method is symmetrically different from that of horizontal recording.
Also.

A magnetic recording medium using the horizontal magnetic recording method is known, for example, as disclosed in Japanese Publication No. 54-52559. However, in horizontal recording, as shown in Figure 1, the demagnetizing field is maximum at the magnetization-anti-pole boundary. This means that as recording density increases, the demagnetizing field becomes even larger, and even if magnetic recording is performed, no magnetic flux is emitted to the outside, so the magnetic toner loses its attractive force, making it difficult to reproduce the recording. There is a problem with this.

Further, a magnetic recording medium using a single-picture direct magnetic recording method is known, for example, as shown in Japanese Patent Application Laid-Open No. 54-54048 K11i. However, FL direct recording requires the use of a magnetic head with a special structure (the main magnetic pole and auxiliary magnetic pole are placed facing the magnetic medium) and requires the ninth largest recording energy due to the large magnetic resistance. Therefore, the present invention focuses on the complementary nature W of horizontal recording and perpendicular recording, and uses a conventional ring head to perform high-resolution T-magnetic recording and develop magnetic toner. succeeded in developing a magnetic recording medium that can be played back by

That is, the present invention provides a magnetic recording medium having a horizontal magnetization layer on one side of the support made of a magnetic material with a small 0EIiK coercive force, and a perpendicular magnetization layer made of a IIi material with a large coercivity on the other side of the support. Kamomoto Invention Omf!, which provides the medium! ! tk! According to the advanced medium, information is transferred using a horizontal magnetic layer made of a magnetic material with a small coercive force using a 9-ng head, and on the other hand, information is transferred using a horizontal magnetic layer made of a magnetic material with a large coercive force. It is possible to perform toner development and transfer the information onto the image. (91) When the magnetic recording medium of the present invention is used, the magnetic recording head and the toner developing section can be placed in parallel with the recording medium, thereby preventing toner from adhering to the ring head and staining it. Things are slowing down. Furthermore, in the present invention, rounded perpendicular recording, which is used in combination with perpendicular recording, has a demagnetizing field of 0 (see Figure 2).Even if the density is increased, magnetic flux appears externally and magnetic toner is attracted, resulting in information being completely lost. It can be played back easily.

The basic structure of the magnetic recording medium of the present invention is as shown in FIG. That is, a horizontal magnetization layer 2 is provided on one surface of the support 1.
is present and on the other side of the support 1 a perpendicular magnetization layer 5 is present.

The material suitable for the horizontal magnetization layer in the present invention is a material with low coercive force and high magnetic permeability.In practice, the magnetic permeability is 10
0 or more preferably 1000 or more, coercive force (Ha) 10
It is necessary to select a material that has a depth of less than 0 oersted (0.) or preferably less than 1000.・-Ni type? -Ni-Mn system, Su-A-permalloy Fe-Ni-Mn-Mo system, ferrite Mn-z, 1 system, Ni-Zn system, etc. are suitable.

Materials suitable for the perpendicular magnetization layer in the present invention are materials with high coercive force and high remanence. In practice, the coercive force (H
It is necessary to select a material having a) of 1000e or more, preferably 5000e or more, and a residual magnetism (Br) of 500 Gauss or more, preferably 1000 Gauss or more. in particular.

Go-Cr, Gl-F@, Tb-lFe, Gd-
Co, G(1-CG-MO.

C+)-Ni-P, Gy-Fe, Ho-C□, etc. remain.

The support in the present invention is suitably non-metallic, such as metal or plastic, and has a thickness of 1 to 100 seconds, preferably 20 microns or less.

Generally, the magnetic recording medium of the present invention is produced by depositing a horizontal magnetic layer on one side of a resonant support to a thickness of 1 by using a sputtering method.
Apply at 1-2sm, one side of Jōshintai, ff1Kfl of the other side
A directly magnetized layer is deposited to a thickness of α1 to 2 by vapor deposition or sputtering.
11! In the magnetic recording medium of the present invention produced in this way, information is transferred to the horizontally magnetized layer by a ring head, while information is transferred by applying magnetic toner to the direct magnetized layer. Re! As shown in FIG. 314, when a signal pulse is applied to the magnetic head 4 and information is written, a part of the horizontal magnetic layer '2 undergoes magnetic reversal.

This generates magnetic flux as shown by the dotted line, causing magnetic reversal in a part of the perpendicular magnetic layer 5. At this time, in order to promote magnetic reversal to the perpendicular magnetic layer 3! An external magnetic field may be applied to the magnetic recording layer 5 or heating may be performed. FIG. is attracted by the magnetic force of the skin image and developed. Sara K.

The sixth example shows the use of the magnetic recording medium of the present invention in an actual device.
To explain with reference to the drawings, first, the horizontal magnetization layer 2 of the magnetic recording medium is magnetically recorded by the magnetic head 4. At this time, it may be heated by the heating heater 5 at the same time.The magnetically reversed-directly magnetized layer 3 is developed by the magnetic toner conveyed by the developing roller 6, and the horizontally magnetized layer is transferred to the paper 8 by the transfer corona charge 7. The magnetization of No. 2 is returned to its original state by the magnetic head.

The present invention will be explained in more detail with reference to the following examples, but is not limited thereto.

Example 1 One side of a steel plate with a thickness of 5 [1 jm] was coated with 2 by sputtering.
A permalloy layer of βm was formed. In addition, a perpendicular magnetization layer made of ν·-Ga (Gd content: 24×) of 1# layer was provided on the other surface of the copper plate by sputtering to produce an OAL magnetic recording medium of the present invention.

Next, apply a bias magnetic field of s o o Os! Magnetic recording is performed by a magnetic head from the armalloy layer side to create a magnetic reversal width of 50 ams and a coercive force of 1 in the permalloy layer.
A magnetic image was formed with a remanence of 1,000 s and a remanence of 1,000 gauss. Next, f) the toner powder made by dispersing magnetic powder in the resin is developed from the Pa-1M layer side, the developed toner image is transferred by pressing a transfer paper, and the toner image on the transfer paper is heated. Melted and fixed.

[Brief explanation of the drawing]

In the attached drawings [Figures 1 and 2 are longitudinal (horizontal)
and one mechanism in the vertical system, and the third
The figure shows the basic structure of the magnetic recording medium of the present invention.%! FIG. 4 shows the recording mechanism in the magnetic recording medium of the present invention, FIG. 5 shows the state of the iA image of the magnetic recording medium of the present invention, and FIG. 6 shows the printing mechanism using the magnetic recording medium of the present invention. An example of the device is shown. Note that the ↑ mark indicates the direction of magnetization and the dotted line indicates lines of magnetic force. DESCRIPTION OF SYMBOLS 1... Support body, 2... Horizontal magnetization layer, 3... Vertical magnetization layer, 4... Magnetic head, 5... Heater, 6
...Developing roller, 7...Transfer corona charge, 8
... paper, 9 ... magnetic head, 10 ... cleaning roller, '11 ... toner collection roller, 12.
...Recovery container, B...Toner 6 Applicant Rigo Co., Ltd. - Procedural amendment January 1980 220 Commissioner of the Patent Office Shima 1) Haruki Tono 1, Indication of the case 1982 Patent Application No. 154841 No. 3. Relationship with the person making the amendment Patent applicant address 1-3-6 Nakamagome, Ota-ku, Tokyo Name (67)
4) Ricoh Co., Ltd. -4, Agent 5, Fj attached with amendment order (voluntary) Showa, month 11 (Shipping date Showa)
) & Supplementary jE (D subject Detailed explanation of the invention in the specification column 1
Contents of correction 1) "0 and na 夛" on page 4, line 7 will be corrected to "smaller". 2) On page 6, in the 5th line and the 5th line “α1~
2μm" is corrected to "1 to 20μm" respectively. 3) On page 7, “Thickness 50 μm” in the 5th line from the bottom
is corrected to “thickness 30μm”, and the second line from the bottom is “2μm”.
" is corrected to "20μm". 4) From the last line of page 7 to the first line of page 8, “1 μ tumor OF@1
-G(1(ea content 2416)J
4b (TI) content is corrected to 241 months. 5) On page 8, correct both "Permalloy layer" in row 5 and "Fs-04 layer" in row #18 to "birch b layer". that's all

Claims (1)

[Claims] It is characterized by having a horizontally magnetized layer made of a monomagnetic material with a small coercive force on one O-plane of the support, and a linearly magnetized layer made of a magnetic material with a large coercive force on the other side of the support. , magnetic recording media.