JPS61156518A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To reduce the contact resistance between a plate-shaped flexible nonmagnetic shock absorber and a magnetic head or a traveling mechanism, to inhibit the wear of a magnetic recording medium and to improve the durability by adhering a nonmagnetic substrate to one side or both sides of the absorber and coating the outside of the substrate with a magnetic coating material to form a magnetic layer. CONSTITUTION:Nonmagnetic polyester substrates 1, 1' are adhered to both sides of a flexible nonmagnetic shock absorber 3 as a central layer, and the outsides of the substrates 1, 1' are coated with a magnetic coating material consisting of magnetic powder, a binder, a solvent and additives such as a dispersant, a lubricant and an antistatic agent to form magnetic layers 2, 2'. The flexible nonmagnetic shock absorber acts as a felt pad, follows well the movement of the resulting flexible magnetic recording medium, and can absorb the pressure of a head, so the durability of the magnetic recording medium can be well improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flexible magnetic recording medium, particularly a magnetic recording medium used as a flexible magnetic recording disk.

[Prior art]

Flexible magnetic recording media used in computers and other devices consist of magnetic powder and a binder on a non-magnetic substrate made of a polymeric material such as polyester film.

It is constructed by coating a magnetic paint consisting of additives such as a solvent 9 dispersant, lubricant, antistatic agent, and abrasive. Such magnetic recording media can be of a semi-gimbal type, in which one side is fixed and the other supported by a gimbal mechanism, as shown in Figure 2, or a gimbal type, in which both sides are supported by a Ginopal mechanism 4, as shown in Figure 3. It is interposed between the flat contact surfaces of two magnetic heads 5, and reading and writing are performed. In addition, in the case of a single-sided head 5 as shown in FIG. 4, a bat 7 made of felt etc.
There is also a device in which reading and writing are carried out by making contact with the flexible magnetic recording medium 6 through the magnetic recording medium 1 and lowering the butt pressure by the action of a butt cushion.

[Problem that the invention seeks to solve]

The magnetic recording medium is always in contact with the magnetic head 5 and a guide portion which is a part of the traveling mechanism during reading and writing, and travels for a long time.

Conventional semi-numeral or) shown in Figures 2 and 3
Two magnetic heads 5 with flat surfaces supported in a magnetic manner
In the case of a double-sided head in which the surface 7 is in contact with the flexible magnetic recording medium 6, a magnetic head 5 having a spherical surface 7 as shown in FIG.
The durability is inferior to that in the case where reading and writing are performed by lowering the pad pressure due to the pad's cushioning effect, as in the case where the flexible magnetic disk is brought into contact with the flexible magnetic disk through the pad 7 made of felt or the like.

In other words, the magnetic layer coated on the surface of the magnetic recording medium supported by the gimbal mechanism described above has a large coefficient of friction and cannot withstand long-term running under harsh conditions of low temperature and low humidity, high temperature and high humidity. There are drawbacks. Therefore, an object of the present invention is to provide a magnetic recording medium that has a cushioning effect on itself, has improved durability, and is suitable for mass production.

[Means for solving problems]

The present invention addresses the drawbacks of conventional magnetic recording media.

In order to reduce the coefficient of friction between the magnetic head and the like during running and to realize a durable magnetic recording medium, one or both surfaces of the plate-shaped flexible non-magnetic absorber 3 are coated with non-magnetic material, as shown in FIG. Substrate (l or.

1 and 1') and a magnetic layer 2 or 2 and 2' whose outer surfaces are coated with magnetic paint. The one shown in Fig. 1 corresponds to the double-sided head shown in Figs. 2 and 3, but in the case of the single-sided head shown in Fig. 3,
The non-magnetic substrate 1' and the magnetic layer 2' are not required.

[Effect]

The contact resistance between the flexible non-magnetic shock absorber and the magnetic head and running mechanism is reduced, and the pad 7 in FIG. 4 has the same effect as the pad 7 in FIG.
Improve durability.

〔Example〕

FIG. 1 is a sectional view in the thickness direction showing the structure of a magnetic recording medium in which magnetic heads are provided on both sides. The flexible non-magnetic absorber 3 is used as a central layer, and a magnetic paint consisting of a binder, a solvent, a dispersant, a lubricant, an antistatic agent, and other additives is applied to form a magnetic layer 2s2'e, thereby producing a magnetic layer according to the present invention. Configure the recording medium.

〔Effect of the invention〕

In a magnetic recording medium configured in this way, whether it is a single-sided head or a single-sided head, the flexible non-magnetic shock absorber acts as a felt-like pad, which is sufficient for the movement of the flexible magnetic recording medium. It can follow and absorb head pressure. Therefore, the durability of the magnetic recording medium can be sufficiently improved. Furthermore, since there is no need to specially provide the pads provided in the case of conventional single-sided heads, problems such as pads falling off and magnetic recording media being scraped are eliminated, making it possible to mass produce high-quality, long-life magnetic recording media. can.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view taken in the thickness direction of a magnetic recording medium according to the present invention. Figures 2 and 5. Is Fig. 4 a conventionally used magnetic recording medium? A schematic diagram for reading and writing is shown. In the figure, 1.1': Non-magnetic substrate 2.2': Magnetic layer coated with magnetic paint 3: Flexible non-magnetic shock absorber 4 Nishinpal mechanism 5: Magnetic head 6: Magnetic recording medium 7: Bad Figure 1 1,1' Figure 2. Fig. 3 Fig. 4 Fig. 2 Non-magnetic substrate, magnetic layer coating and Iso layer: Kasumisha I Kassei Meike Q9 Modern style Nishin Pal Iso Sei 2 Magnetic head: Magnetic Rth Discount book: l Ma Sodo

Claims (1)

[Claims] 1. A magnetic recording medium comprising a non-magnetic substrate in contact with the surface of a flexible non-magnetic absorber, and a magnetic material further coated on the outer surface of the non-magnetic substrate to form a magnetic layer.