JPS58133629A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain protective films which prevent the corrosion of a magnetic film, the abrasion of the magnetic film and a head and do not peel from the magnetic film by providing plural layers of the protective films having different functions on a magnetic material. CONSTITUTION:An epoxy resin is coated on the top surface of a magnetic layer 14, whereby the 1st protective layer 16 is formed. The epoxy resin has high adhesion to the layer 14 and prevents the corrosion of the layer 14. Stearic acid is coated on the top surface of the layer 16, whereby the 2nd protective film 18 is formed. The stearic acid decreases the friction with objects which come into sliding contact therewith. The adhesion of the layer 16 and the layer 18 is good, and the layers 16 and 18 constitute the protective film 20 of a magnetic recording medium 10. The respective thicknesses of the layers 16, 18 are 100-150 angstrom.

Description

[Detailed Description of the Invention] This invention relates to a magnetic recording medium, and in particular to a magnetic recording medium in which a magnetic material is adhered onto a pot by chemical plating or vapor deposition without using a binder. @ the magnetic recording wire.

On one body like polymer Tzirm, F@, 0@, Ni4i
In recent years, magnetic recording wire bodies formed by attaching ferromagnetic metals ( ) or base metals of these materials by chemical plating or vapor deposition have become known.

This type of magnetic recording wire has a magnetic film that can be made thinner than conventional magnetic recording wires, which are formed by mixing a ferromagnetic metal with a binder and then coating it on a substrate. It is possible to reduce the thickness of the recording medium, increase the amount of magnetic recording medium stored in the tape cassette housing, and increase the time for magnetic recording. It has the advantage of being able to increase the degree of information recorded in the system.

However, as a reaction to the above advantages, the magnetic film made of ferromagnetic metal has a high hardness, so it not only wears out objects such as magnetic heads that come in contact with this magnetic material, but also causes the magnetic film to deviate from its axis. It also has the disadvantage of being easy to use. Furthermore, since the ferromagnetic metal is exposed to the outside air, there is also the disadvantage that the ferromagnetic metal is easily corroded.In order to eliminate these disadvantages mentioned above, a holding layer is added to the magnetic film. Forming is conventionally performed.

Conventionally, as a protective agent, a strong lubricant coated with IA and E11 is known. This #IiI? Preservation viI by 111 agent
m functions to reduce the frictional force generated between the protection #1 film and an object such as a magnetic head that is in sliding contact with the protective film, thereby reducing the wear and tear of the object. However, protection due to #5 blasphemy! 11 has the disadvantage that the VB adhesion to the magnetic layer is poor and it is easily peeled off from the magnetic film by repeated contact with an object such as a magnetic head. It has no function.

Conventionally, a synthetic resin coated on a magnetic layer is known as a protective film. This synthetic resin contains a lubricant. 'A protective film made of a synthetic resin containing a lubricant has both the lubrication effect produced by the lubricant control and the anti-corrosion effect produced by the synthetic resin.

However, since the above-mentioned lubricant is contained, the lubricant film has poor adhesion to the magnetic layer, and has the disadvantage that it is more easily attracted from the magnetic layer than K when it comes into repeated contact with an object such as a magnetic head. have.

, this invention was made based on the above circumstances,
An object of the present invention is to prevent corrosion of a magnetic layer. The present invention also provides a magnetic recording medium having a VI film that can perform multiple main functions of preventing wear of objects and magnetic layers that come into sliding contact with the magnetic recording medium, and that does not peel off from the magnetic film. It is to be.

Embodiments of the present invention will be described below with reference to the drawings.

1-, a magnetic recording medium 10 according to an embodiment of the present invention;
A part of the longitudinal section is shown. The magnetic recording wire 10 according to this embodiment is a magnetic recording tape, and as shown in FIG. 1, has a base J2 made of polymer film. P@ is deposited on the upper surface of the substrate 12 by chemical deposition or vacuum deposition.

The magnetic layer 14 is formed by depositing whole islands of ferromagnetic material of Oo, N, or alloys thereof.

On the upper surface of the magnetic layer 14, epoxy resin is perforated to form a transparent protective layer 16. Epoxy resin has excellent adhesion to the magnetic layer 14 and
Its main function is to prevent the horse from touching the horse.

Furthermore, stearic acid is coated on the upper surface of the protection layer 16 with t/N of 1 to form a second protection layer 18.

Stearic acid primarily has the soap function of reducing the friction of straw with objects that come into contact with it.

The adhesion of the second & koji layer 18 made of stearic acid to the protective layer 111 made of epoxy resin is good;
The first &L protector 16 and the second protector 18 constitute a protective film 18 of the magnetic recording wire 10 according to this embodiment of the invention.

In this embodiment, the first and second insulation layers 16, I
The thickness of each of II is 106 to 150 f''+.11.
.

The magnetic recording wire 1- according to the embodiment of the present invention is referred to as a -Ig1 magnetic recording medium, and is composed of only a base 10 and a magnetic layer 14. & After much experimentation, we coated the magnetic layer 14 attached to the substrate 10 with a gloss 3 magnetic recording medium and epoxy, which mainly has a corrosion-resistant function! The fourth magnetic recording medium was coated on the magnetic layer 14 attached to the base 10 using M fat as a protective film. Mainly contains 11g of epoxy resin! In this experiment, as shown in Fig. 2, the magnetic cloth attached to the X body 10゛ is
After the first to fifth magnetic recording media having a width of λ81MJ indicated by reference symbol 22 are held between the magnetic head 24 and the pad 2'6', each of the first to fifth magnetic recording media j2 is
When one end is pulled by the spring meter 28 and a constant speed is applied to each of the first to fifth magnetic self-recording media 22, K+
The resistance value (g"') loaded on the 4-needle needle 2J was measured as the amount of frictional force. At this time, the magnetic head 24 was pressed against the pad 26 with a strength of xoH. This measurement result is as shown in Table 1 below.

Table 1 From the measurement results, it can be seen that the thick rubbing device of the first magnetic recording medium, which is the magnetic recording medium 10 according to the embodiment of the present invention, is the smallest, and that of the magnetic heads 24 in sliding contact with the first recording medium at once. It can be seen that the distance between objects can be reduced compared to others.

In addition, in a bird corrosion resistance experiment using artificial juice, the first magnetic recording medium, which is the magnetic recording medium 10 according to the embodiment of the present invention, had better performance than the second to fourth magnetic recording media. It fired a bullet.

The magnetic recording medium of the present invention comprises a substrate, a magnetic material attached to the substrate, and a plurality of magnetic materials formed on the magnetic material, each having the same main functions as each other. It is characterized by comprising a tI! film having a layer;

With such a configuration, it is possible to provide a magnetic recording medium that can prevent corrosion of the magnetic film and has a high resistance to static electricity without being static-damaged from an object film that is in sliding contact with the magnetic recording medium.

The above-mentioned embodiments are for illustrating the present invention, and are not intended to limit the scope of the present invention, and any modifications or alterations made within the technical scope of the present invention are also included in the present invention. Needless to say, it will be done.

For example, the first layer 14 may be made of polyester resin or acrylic resin.

Further, the coating layer 16 of the rice cake 2 may be made of a fatty acid ester surfactant other than stearic acid.

In addition, aluminum, which mainly functions as an underlayer, is deposited on the magnetic f@14, and the aluminum film 5 is coated with a first protective layer 14 and a second It3IF protective layer 18 on top of the film. You may replace No. 20. This aluminum vapor deposited film reduces the roughness of the top surface of &-Renkan 2o, and
The frictional force generated between the I film 2o and the object on the protective film 20 is smaller than the frictional force generated on the protective film 2o on the magnetic recording medium 1°4 according to the embodiment of the present invention. let

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a part of a magnetic recording medium according to an embodiment of the present invention, and FIG. 2 is a diagram schematically showing an experiment for measuring pig regret. 10... Magnetic recording medium, 12... Substrate, 14...
Magnetic layer, 16... First protective layer, 18... Second protective layer, 20... Protective film, 22... Each of the first to fifth magnetic recording media, 24... Magnetic head, 26...
・Pad, 2B...Spring meter. Patent attorney Suzue Bubachi representing the applicant

Claims (1)

[Scope of Claims] A base body; a magnetic body adhered on the base body; and an MI retaining body formed on the magnetic body and having a plurality of layers each having a mutually different main function; A magnetic recording medium characterized by: