JPH0773463A - Method and device for producing magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a high reproduced output by running a longsized supporting body tilting at an angle to magnetic particles which come flying to obtain the magnetic recording medium where the scanning direction of a VTR and the growing direction of magnetic particles approximately coincide with each other. CONSTITUTION:A supply roll 2a, a cooling can 1, and a take-up roll 2b are so attached that their axes are inclined at an angle alpha to the horizontal direction. Consequently, the supporting body 3 which is wound up around the take-up roll 2b from the supply roll 2a through the cooling can 1 is constituted at the angle alpha to the perpendicular direction. A magnetic metal 5 in a crucible 4 is evaporated by heating with a resistance, a high frequency, an electron beam, or the like after a vacuum vessel 6 is evacuated to the degree of the vacuum in a prescribed range, and the magnetic metal 5 is vapor-deposited to the supporting body 3 like a PET film to obtain the metallic thin film magnetic recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium manufacturing method and apparatus.

[0002]

BACKGROUND OF THE INVENTION In a magnetic recording medium such as a magnetic tape, due to a demand for high density recording, a binder resin is not used as a magnetic layer provided on a non-magnetic support, instead of a coating type using a binder resin. A metal thin film type that is not used has been proposed. That is, it is well known that a magnetic recording medium having a magnetic layer formed by a dry plating means such as vacuum deposition, sputtering or ion plating has been proposed. Since the magnetic recording medium of this type has a high packing density of magnetic material, it is suitable for high-density recording.

An apparatus for manufacturing a magnetic recording medium by such dry plating means is generally constructed as shown in FIGS. 2 (a) and 2 (b). In FIG. 2, 21 is a cooling can and 22a is polyethylene terephthalate (PE
T) A supply-side roll for the film 23, 22b a roll for winding the PET film 23, 24 a crucible, 25 a magnetic metal, and 26 a vacuum container. Then, after evacuating the inside of the vacuum vessel 26 to a predetermined vacuum degree, the electron gun 27 is operated to evaporate the magnetic metal 25 in the crucible 24, and evaporated particles of the magnetic metal 25 are deposited on the PET film 23. A magnetic recording medium is manufactured by (vapor deposition).

By the way, as the relationship between the helical scan type video tape recorder (VTR) and the magnetic tape mounted thereon is examined, it is pointed out that the relationship between them is as follows. ing. That is, the magnetic tape is wound around the cylinder 31 of the VTR as shown in FIG. 3, and its scanning direction is as shown in FIG.
It is oblique to the longitudinal direction of the magnetic tape 30.
However, deposition (growth) on the conventional magnetic tape 30
The direction of the magnetic particles is perpendicular to the surface of the magnetic tape and parallel to the longitudinal direction. Therefore, the scanning direction by the VTR and the growth direction of the magnetic particles are obviously different from each other. Proposal that the reproduction output can be increased by correcting this discrepancy (Japanese Patent Laid-Open No. 5-1979).
48 gazette).

That is, in the apparatus for manufacturing a magnetic recording medium as shown in FIG. 2, if the crucible 24 is tilted and the magnetic metal 25 is evaporated and deposited in this state, The magnetic recording medium as shown in FIG. 5 is obtained, and it is said that the scanning direction by the VTR and the growing direction of the magnetic particles coincide with each other, and the reproduction output is improved.

The inventor of the present invention also prototyped a device according to this proposal and prototyped a magnetic recording medium. However, it is no different from the conventional one, that is, the magnetic recording medium having the structure shown in FIG. Was not. However, since it is expected that the magnetic recording medium having the structure shown in FIG. 5 will be preferable, the inventors have made efforts to develop a technique for producing a magnetic recording medium having such a structure or a structure close to this structure.

[0007]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a technique for manufacturing a magnetic recording medium in which the scanning direction by VTR and the growth direction of magnetic particles are substantially the same. An object of the present invention is a method for producing a magnetic recording medium in which metal magnetic particles are deposited on a long-sized support to form a magnetic layer, and long-sized support is provided for flying magnetic particles. This is achieved by a method for manufacturing a magnetic recording medium, which is characterized by tilting a body to run.

It is preferable that the head for scanning the medium has an inclination angle (α) which is the same as the angle with respect to the longitudinal direction of the support. Specifically, the inclination angle (α) is about 4 to 15 °. A magnetic recording medium manufacturing apparatus in which metallic magnetic particles are deposited on a long-sized support to form a magnetic layer, wherein a flying source of metallic magnetic particles and metallic magnetic particles flying from this flying source are deposited. And an inclined cooling can for guiding the support, and traveling means for causing the support to travel along the inclined cooling can. To be done.

It is preferable that the inclination angle (α) of the cooling can is set so that the head for scanning the medium has the same angle as the angle with respect to the longitudinal direction of the support. Specifically, the inclination angle (α) is about 4 to 15 °. When the manufacturing method or manufacturing apparatus as described above is used, a magnetic recording medium having a structure as shown in FIG. 5 is obtained, and a high reproduction output can be obtained from this magnetic recording medium.

A concrete example will be described below.

[0011]

1 is a schematic side view showing a first embodiment of an apparatus for manufacturing a magnetic recording medium according to the present invention. In the figure, 1 is a cooling can, 2a is a supply side roll of the support 3, 2b is a winding side roll of the support 3, 4 is a crucible, 5 is a magnetic metal, 6
Is a vacuum container.

In the present embodiment, the axes of the supply side roll 2a, the cooling can 1 and the winding side roll 2b are α with respect to the horizontal direction (α is for 8 mm VTR,
The support 3 is attached so as to form an angle of 5 °). Therefore, the support 3 wound from the supply-side roll 2a to the winding-side roll 2b via the cooling can 1 forms an angle α with respect to the vertical direction. It is constructed to be inclined.

The support 3 is non-magnetic, and the support 3 is made of polyester such as PET, polyamide, polyimide, polysulfone, polycarbonate, olefin resin such as polypropylene, cellulose resin,
Polymer materials such as vinyl chloride resins, inorganic materials such as glass and ceramics, and metal materials such as aluminum alloys are used. An undercoat layer for improving the adhesion of the magnetic layer (magnetic thin film) is provided on the surface of the support 3 as needed. That is, by appropriately roughening the surface roughness, for example, the adhesion of the magnetic thin film formed by the oblique vapor deposition method is improved, and the surface roughness of the magnetic recording medium surface is moderated to improve the running property. Therefore, for example, the thickness containing particles such as SiO ₂ is 0.0
The undercoat layer is formed by providing a coating film having a thickness of 05 to 0.1 μm.

The magnetic metal 5 to be filled in the crucible 4 is, for example, a metal such as Fe, Co or Ni, and Co--N.
i alloy, Co-Pt alloy, Co-Ni-Pt alloy, Fe
-Co alloy, Fe-Ni alloy, Fe-Co-Ni alloy,
Fe-Co-B alloy, Co-Ni-Fe-B alloy, Co
-Cr alloys, alloys containing these metals such as Al, or the like.

In the apparatus constructed as described above, the vacuum vessel 6 is evacuated to a vacuum degree of about 10 ^-4 to 10 ^-6 Torr, and then the crucible 4 is heated by resistance heating, high frequency heating, electron beam heating or the like. Evaporate the magnetic metal 5 inside, PE
A metal thin film type magnetic recording medium is manufactured by depositing a magnetic metal 5 having a thickness of 0.04 to 1 μm on a support 3 such as a T film. When forming the magnetic thin film,
It is preferable that the surface layer of the magnetic thin film is oxidized by supplying oxygen to the vapor deposition portion and forcibly oxidizing it to form a protective layer of an oxide film. The thickness of the protective layer composed of this oxide film is about several tens of liters,
An oxide film having such a thickness may be formed by natural oxidation, and in such a case, it may not be necessary to take measures for forced oxidation.

After that, the winding side roll 2b is taken out, and a back coat paint obtained by dispersing carbon black having an average particle size of 20 nm and a binder resin composed of a vinyl chloride resin and a urethane prepolymer is prepared by a direct gravure method. Is applied to the support 3 on the side opposite to the magnetic layer to provide a back coat layer having a dry thickness of 0.5 μm.
Fluorine perfluoropolyether (grade:
FOMBLIN ZDIAC Carboxyl group-modified, manufactured by Nippon Montedison Co., Ltd. was diluted and dispersed in a fluorine-inert liquid (Fluorinert, FC-84, Sumitomo 3M Co., Ltd.) to a concentration of 0.1%, and then dried by a die coating method. Is applied to the magnetic surface so that the thickness is about 20Å
Dry at 0 ° C.

After that, the magnetic tape is slit into a predetermined width. When the structure of the magnetic layer of the magnetic recording medium thus obtained was examined, the structure was as shown in FIG. When this magnetic recording medium is compared with the magnetic recording medium manufactured by using the apparatus configured as shown in FIG. 2, the magnetic tape obtained in this example has a reproduction output higher by 2 dB. Met.

[0018]

According to the present invention, a magnetic recording medium having a high reproduction output can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view of a magnetic recording medium manufacturing apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a conventional magnetic recording medium manufacturing apparatus.

FIG. 3 is an explanatory diagram of a magnetic tape wound around a rotary head of a VTR.

FIG. 4 is an explanatory diagram showing a track direction of a magnetic tape.

FIG. 5 is a schematic diagram of a magnetic recording medium showing the growth direction of magnetic particles.

[Explanation of symbols]

 1 Cooling Can 2a Supply Side Roll 2b Winding Side Roll 3 Support 4 Crucible 5 Magnetic Metal 6 Vacuum Container

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Shiga 2606 Akabane, Kai-cho, Haga-gun, Tochigi Prefecture Kao Co., Ltd.

Claims (4)

[Claims] 1. A method of manufacturing a magnetic recording medium in which metallic magnetic particles are deposited on a long support to form a magnetic layer, wherein a long support is provided for magnetic particles coming in. A method of manufacturing a magnetic recording medium, which comprises running the vehicle at an angle. 2. A method of manufacturing a magnetic recording medium according to claim 1, wherein the head for scanning the medium is tilted by the same angle as the angle with respect to the longitudinal direction of the support for traveling. 3. An apparatus for producing a magnetic recording medium, wherein magnetic magnetic particles are deposited on a long-sized support to form a magnetic layer, and the flying source of the metallic magnetic particles and the metallic magnetism flying from the flying source. Manufacture of a magnetic recording medium comprising an inclined cooling can for guiding the support on which particles are deposited, and a traveling means for causing the support to travel along the inclined cooling can. apparatus. 4. The apparatus for manufacturing a magnetic recording medium according to claim 3, wherein the head for scanning the medium is provided with the cooling can inclined by the same angle as the angle with respect to the longitudinal direction of the support.