JPH0366734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method for simultaneously polishing both the front and back surfaces of a magnetic layer of a flexible magnetic disk in a concentric manner.

Flexible magnetic disks are used as recording media in information processing devices, and are made by applying magnetic paint to both sides of a flexible substrate such as polyester film, drying it, then punching it out into a disk shape, and polishing the coated surface uniformly. This is what happens. This polishing is performed to ensure high reliability with no dropouts and excellent surface quality when the magnetic head slides into contact with the disk surface to record and reproduce information during use. be.

In manufacturing such flexible magnetic disks, the magnetic layer can be coated and formed using a long film, but polishing must be performed one by one, and both surfaces must be polished in the same way.

Conventionally, the method of polishing one side at a time by pressing an abrasive sheet or band-shaped abrasive tape with the same shape and dimensions as the disk against the rotating disk to be polished was used, which resulted in poor productivity and The polished surface also had a major drawback in terms of quality because it was directly affected by the unpolished surface condition of the back surface and the surface condition of the flat substrate to which it was pressed.

Figure 1 is a diagram showing a polishing method in a conventional flexible magnetic disk manufacturing method.
1 is a magnetic disk formed by forming a magnetic layer on a polyester film base, 2 is a chuck for clamping the center hole, 3 is a flat substrate that rotates together with the magnetic disk 1, 4 is a rotation drive motor, 5 is an abrasive tape, 6 is a push rod that presses the polishing tape 5 against the magnetic disk 1.

To polish the magnetic disk 1 using this manufacturing method, the magnetic disk 1 held by the chuck 2 is rotated by the drive of the motor 4, and the polishing tape 5 is pressed against the surface of the magnetic disk 1 using a push rod 6 made of felt or the like. Bye. The abrasive tape 5 is made of a film made of polyester or the like coated with a mixture of a binder and a fine abrasive powder such as fused alumina, silicon carbide, chromium oxide, corundum, or iron oxide.
It has a polishing layer of ~20μ.

In this conventional manufacturing method, as described above, only one side can be polished, and dirt and irregularities on the substrate directly affect the polished surface of the disk, causing dropouts.

The present invention was developed to improve these conventional drawbacks, and aims to improve productivity and quality by using a manufacturing method that simultaneously polishes both sides of the disk.

In the present invention, the innermost peripheral part and the outermost peripheral part other than the recording/reproducing part are clamped and rotated by an openable and closable holder having a rubber elastic ring at the tip,
Two guide members are provided that rotate or move along a center line perpendicular to the center line of the rotation axis of the disk, and that sandwich both sides of the disk and press the same position, and between the guide members and the disk surface. This is a manufacturing method in which a polishing tape is interposed and the surface of the polishing tape is brought into sliding contact with the disk surface for polishing.

FIGS. 2 and 3 show a polishing apparatus used in the manufacturing method of the present invention. That is, magnetic disk 1
The innermost circumferential part and the outermost circumferential part other than the recording/reproducing part are clamped with a holder 8 having a rubber elastic ring 7 at the tip,
The upper and lower holders 8 are rotated in the same direction and at the same speed by a drive motor 9 and a rotation transmission gear 10. Base 1 that rotatably holds the upper holding body 8
1 can be slid with respect to the lower base 12 by air pressure or the like, thereby clamping the magnetic disk. Further, inside the holder 8, there is provided a track for the polishing tape 5 which pinches both sides of the magnetic disk 1 and presses the same position. This abrasive tape 5 is constructed so that it can be moved so that a new abrasive surface always comes into sliding contact with the disk surface. Also,
The push rod 6, which serves as a guide member for pressing the polishing tape 5 against the magnetic disk 1, is configured to absorb excessive pressure by using materials such as felt or polymer foam, or by using a spring structure. Both the front and back sides of the magnetic disk 1 can be polished at the same time.

When a magnetic disk was polished using the manufacturing method of the present invention, the time was more than doubled compared to the conventional method, and since the polished surface did not come into contact with the substrate, surface irregularities such as dust could be removed. A uniformly polished surface was obtained without any influence. Therefore, it was possible to completely prevent dropouts from occurring during the polishing process.

As described above, according to the manufacturing method of the present invention, it is possible to significantly shorten the time required for polishing the disk surface, and it is also possible to prevent dropouts from occurring during the polishing process.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the state of the polishing process in the conventional flexible magnetic disk manufacturing method;
The figure is a schematic diagram showing the state of the polishing process in the method for manufacturing a flexible magnetic disk according to an embodiment of the present invention, and FIG. 3 is a perspective view of the main part of the process. 1... Magnetic disk, 5... Polishing tape, 6...
...Push rod, 7...Rubber elastic ring, 8...Holding body.

Claims (1)

[Claims] 1. Clamping the outermost and innermost parts of the flexible magnetic disk other than the recording/reproducing section with a holder having a rubber elastic ring at the tip, and in this state rotating the holder to rotate the flexible magnetic disk, and A guide member is provided that pinches and presses both sides of the recording/reproducing portion of the flexible magnetic disk, and an abrasive tape is interposed between the guide member and the flexible magnetic disk, and the abrasive tape is slidably attached to the surface of the flexible magnetic disk. A method for manufacturing a flexible magnetic disk, which is characterized by polishing.