JPH01102731A - Manufacture of flexible disk - Google Patents

Abstract

PURPOSE:To obtain a flexible disk with superior nondefective ratio and durability in which homogenization can be obtained by performing secondary grinding on the surface of the flexible disk after being ground by a grinding tape by a specific grinding head. CONSTITUTION:The surface of the flexible disk 2 after being ground by the grinding tape is ground by the grinding head 1 formed in a layer shape block adhered along in the rotational direction of the disk and in such a way that plural blocks are linked at a plane at right angles to the rotational direction. Therefore, it is possible to smooth the surface of the flexible disk 1 after being ground by the grinding tape by the edge of substance adhered along the direction in which the head 1 travels and also, an end face linked at the plane at right angles to the rotational direction. In such a way, it is possible to obtain the flexible disk 2 with superior nondefective ratio and durability.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a flexible disk.

[Conventional technology]

One of the factors that causes variations in the track signal quality and durability of flexible disks is the uneven roughness of the coated flexible disk surface.To adjust this, a surface polishing method such as polishing tape is used. . However, variations in the surface roughness of the abrasive tape have a major impact on the manufacturing conditions of flexible disks in terms of problems in the abrasive tape manufacturing process and the form of the product wound on a reel. Although there is a need for abrasive tape, no effective solution has been found.

On the other hand, as a means of improving the surface quality of a magnetic recording medium, which is a fixed magnetic disk, in which a magnetic paint similar to that used for flexible disks is coated on a hard substrate.

The smoothness of the medium surface is realized using a special tool called a vanishing head, which has notches and grooves on the head surface, but due to its mechanism, it has not been applied to flexible disks with soft substrates.

[Problem that the invention seeks to solve].

Conventionally, uneven roughness on the surface of this type of flexible disk has been an unavoidable problem for coated flexible disks, and the solution to this problem is to improve the dispersibility of the magnetic paint and reduce the particle shape of the coated paint. Measures such as these have been taken, and some effectiveness has been confirmed. However, in recent years, as flexible disks have become larger in capacity and require greater durability, reducing uneven roughness on the surface of flexible disks has become an increasingly important issue. In addition to improving the dispersibility of magnetic paints, it is strongly desired to improve the surface properties of flexible disks by conventional tape polishing methods.

[Means for solving problems]

According to the present invention, the surface of a flexible disk after being polished with an abrasive tape is made of a layered block laminated along the rotational direction of the disk, and a plurality of 22-locks are connected by a plane perpendicular to the rotational direction. A method for manufacturing a flexible disk that is polished with a shaped polishing head is obtained, and a flexible disk that maintains a good balance between signal quality and durability can be provided.

[Effect]

After being polished with an abrasive tape, the surface of the flexible disk is smoothed by ridges of material glued together along the direction in which the head travels, and by end faces connected at right angles to the direction of rotation.

This method is superior to conventional methods using particles such as abrasive tape.

〔Example〕

Below, nine embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention, C, was carried out using a flexible disk laminated along the rotational direction as shown in FIG.

FIG. 2 shows a side view of a polishing apparatus for polishing a flexible disk using the polishing head 1.

The flexible disk 2 to be polished is supported by a clamp mechanism 4 at its central portion and rotated by a two-rotation drive system 3. The polishing head 1 is applied to the surface of the floppy disk 2 from both sides or one side, and pressure is applied.

Table 1 and Table 1 compare the changes in surface roughness Ra, good product rate, and durability when the polishing head 1 is applied from both sides to a flexible disk whose surface has been polished with a polishing tape. The relationship between surface roughness Ra, non-defective product rate, and durability as shown by the solid line in Figure 3 was obtained.

Table 1 Ra Good product rate After durability polishing 0
．． 016μm 78% 19 million tJ? Su0.
015μm 80% 20 million passes 0.01
4μm 81% 25 million nogs 0.013μ
m 851 18 million passes We conducted a similar study with polishing using a polishing tape, and Tables 2 and 3 show the results.
A relationship between surface roughness Ra, non-defective product rate, and durability as shown by the broken line in the figure was obtained.

Table 2 Ra Good product rate After durability polishing 0
．． 0161Rn 73% 23 million/x0.
015μm 80% 20 million J? 0.01
4μm 81% 20 million no 4s 0.013μ
m 75% 16 million passes The above results show that when polishing with an abrasive tape, if too much is removed to improve surface properties, both the yield rate and durability tend to decrease. On the other hand, according to the method according to the second invention, flexible disks with good quality and durability could be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the surface of the flexible disk that has been polished with the polishing tape is subjected to secondary polishing with a polishing head, which improves the quality of products with uniformity.
A flexible disk with good durability can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the polishing head used in the present invention, with the surface facing the flexible disk facing up, Fig. 2 is a side view of the polishing device to which the polishing head is attached, and Fig. 3 shows surface roughness. FIG. 3 is a diagram showing the relationship between the non-defective product rate and durability when the quality is changed. 1: polishing head, 2: flexible disk. 3: Rotation 1 vomiting system. Agent (7783) Patent Attorney Tamotsu Ikeda (Expletive)

Claims (1)

[Claims] 1. The surface of a flexible disk polished with an abrasive tape is polished by a polishing head with a layered block laminated along the rotational direction of the disk and a shape in which multiple blocks are connected by a plane perpendicular to the rotational direction. A method for manufacturing a flexible disk whose surface is polished.