JPH0445917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flexible disk for magnetic recording,
In particular, this invention relates to improvements in jackets for flexible disks for perpendicular magnetic recording.

A liner is attached to the inner surface of the jacket of a flexible disk for magnetic recording.

The two functions required of this liner are high lubricity and good cleaning properties. However, increasing the lubricity deteriorates the cleaning properties, and these two functions are in a contradictory relationship, making it difficult to completely satisfy both functions. Therefore,
Conventionally, the liner was embossed and the pattern was changed, and the method of pasting it with the jacket was changed.
By controlling the thickness of the liner, etc.
We have experimentally selected a solution that satisfies the overall performance and dealt with it. However, when this type of conventional jacket is applied to a perpendicular magnetic recording disk, the magnetic material for signal recording is
Because the liner is denser, the contact between the liner and the disk is stronger than that of conventional disks, resulting in rotational irregularities during driving, which causes scratches on the disk surface in a short period of time.

It is an object of the present invention to solve these drawbacks and provide a jacket with excellent lubricity and cleaning properties for a perpendicular magnetic recording disk.

The present invention achieves both functions by using a liner with excellent cleaning properties and a liner with high lubricity in different locations.

Figure 1 shows an embodiment of the present invention, in which 1 is a disk cleaning liner, and examples of materials include 20% polypropylene, polyester
There is 80% copolymer resin. 2 is a highly lubricating liner, and an example of the material is 100% polyester resin. When such a structure is adopted, the dust generated inside the jacket is taken into the first cleaning liner. Since this cleaning liner portion is designed to occupy a very small area of the entire scanning surface while contacting the recording surface of the disk, the degree of damage to the surface of the disk can be extremely reduced. Part 2 is a highly lubricating liner that occupies most of the other surface of the disc that is scanned while contacting the recording surface of the disc, thereby stabilizing the rotation of the disc and protecting the disc surface.

With the above liner combinations, experiments showed that
It was confirmed that the increase in dropout was not counted after 3 million passes when driven at a rotation speed of 300 rpm.

Furthermore, when a disk was placed in a conventional jacket and tested under the same conditions as above, scratches several micrometers in size were seen uniformly appearing on the disk surface after about 100,000 passes.

The present invention, as in the above-mentioned embodiment, radially attaches a liner with good cleaning properties to a part of the surface that is scanned while contacting the recording surface of the disk in the jacket, for example, near the head window. By attaching a highly lubricating liner with a low coefficient of friction to the other parts, cleaning performance and high lubricity are both achieved. The material and type of the liner may be any combination as long as it has both of the above-mentioned properties, and the shape can be selected from a wide range of shapes, such as fibers and liner embossing.

On the other hand, the method of attaching the liner of the present invention to the jacket body made of vinyl chloride or the like is not limited to methods such as welding, adhesion, etc., and the attachment position and attachment pattern of this different type of liner are such that it comes into contact with the recording surface of the disk. There are no restrictions other than the majority of the surface to be scanned.

As explained above, the jacket of the present invention has a structure in which dust is removed from a portion of the jacket and the other portion has high lubricity. Therefore, the recording area is constantly cleaned, and dropouts are prevented from occurring during recording and reproduction, which is extremely effective. On the other hand, the highly lubricated liner (2) provides many advantages such as stable disk rotation, prevention of damage to the disk surface, improved reliability and longevity, and has great industrial value. Extremely high.

[Brief explanation of drawings]

FIG. 1 is a developed view of a flexible jacket for perpendicular magnetic recording, showing one embodiment of the present invention.
1 is an attachment part made of Niner material with good cleaning properties, 2 is an attachment part made of highly lubricant liner material with a low coefficient of friction, 3 is a vinyl chloride jacket, 4 is a center hole, and 5 is a window for a magnetic recording/reproducing head.

Claims (1)

[Scope of Claims] 1. In a jacket used for a flexible disk for magnetic recording, a liner material with excellent cleaning properties for magnetic recording media is provided on a part of the surface that scans while contacting the recording surface of the disk inside the jacket. A jacket for a flexible disk for perpendicular magnetic recording, characterized in that a liner material with excellent lubricity is attached to the other parts of the jacket. 2. A flexible disk for perpendicular magnetic recording according to claim 1, wherein the liner material with excellent cleaning properties is a copolymer of polypropylene and polyester, and the liner material with excellent lubricity is a polyester resin. Jacket.