JPH0750079A - Manufacture of disk cartridge - Google Patents

Abstract

PURPOSE: To obtain a process for production capable of easily adhering and fixing the magnetic medium and center core of a disk cartridge at a low cost. CONSTITUTION: A hot melt ring 21 is mounted on the overlap surface of the center core 6 of the magnetic medium 4 of the disk cartridge formed by freely rotatably housing the magnetic medium 4 mounted with the center core 6 in the central part in a case 3 and is heat treated in the state of fitting the center core 6 into the hole 6 of the magnetic medium 4. As a result, the hot melt ring 21 is softened and the center core 6 is adhered and fixed to the magnetic medium 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a disk cartridge, and more particularly to a method of fixing a magnetic medium and a center core housed in a case.

[0002]

2. Description of the Related Art FIG. 5 illustrates a general structure of a disk cartridge, which is a hard plastic upper shell 1.
And a lower shell 2 are fitted together to form a thin rectangular case 3 and a magnetic medium 4 housed in the case 3. The magnetic medium 4 is centered in a hole 5 provided in the center thereof. The core 6 is fitted and fixed, and the center core 6 is rotatably supported by the center hole 7 of the lower shell 2. The center core 6 is provided with a spindle insertion hole 8 and a drive pin insertion hole 9 and The shell 1 and the lower shell 2 are provided with head insertion openings 10 and 11.

In the process of assembling the disk cartridge as described above, the center core 6 is inserted into the hole 5 of the magnetic medium 4.
Need to be fitted and fixed.

Conventionally, the center core 6 is fixed to the magnetic medium 4 by using a ring 12 formed by using a double-sided adhesive as shown in FIGS. 5 and 6, and in the assembly process, around the hole 5 of the magnetic medium 4. Alternatively, after the ring 12 is attached to the flange portion 13 of the center core 6, the magnetic media 4 and the center core 6 are adhered, or the magnetic media 4 or the center core 6 is applied with a dispenser or the like and pressure-bonded. ing.

The ring 12 using the double-sided adhesive is shown in FIG.
As shown in FIG. 8A and FIG. 8B, after applying the double-sided adhesive on the surface of the strip-shaped separator 14, a punching hole 15 having a diameter smaller than that of the double-sided adhesive is punched in the application part of each double-sided adhesive on the double-sided adhesive and the separator 14. The ring 12 is formed by the double-sided adhesive left on the separator 14, and the separator 14
The release paper 16 is superposed on the surface on which the ring 12 is formed.

[0006]

However, when the double-sided pressure-sensitive adhesive ring 12 is attached to either the magnetic medium 4 or the center core 6 during the assembling process, the other adhesive surface must be adhered quickly. There is a problem that the ring 12 adheres to other parts and interferes with the assembly process.

Further, in the manufacturing process of the ring 12, most of the double-sided adhesive applied is punched out and discarded, which is very wasteful in terms of resources and economy. There is variation in thickness and dimensions due to shrinkage, and when an adhesive is applied, it deforms during curing, which is a quality problem.

Therefore, according to the present invention, there is no adhesion of other parts during the assembling process, the ring formation is resource-saving and economically economical, and the quality of the disk cartridge is further improved. It is intended to provide a way.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a hot melt ring is attached to an overlapping surface of a magnetic medium with a center core, and the center core is fitted into a hole of the magnetic medium. In this state, heat treatment is performed, and the center core is adhered and fixed to the magnetic medium with a hot melt ring.

In the present invention, the hot melt ring can be attached to the magnetic medium by a direct screen printing method or a transfer method.

[0011]

When the hot melt ring is attached to the surface of the magnetic medium that overlaps with the center core attached to the magnetic medium, and the heat treatment is performed with the center core fitted in the hole of the magnetic medium, the hot melt ring is softened and the magnetic medium The center core can be bonded and fixed to.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4 of the accompanying drawings. Since the basic structure of the disk cartridge is the same as that of the conventional example shown in FIG. 5, the same parts are designated by the same reference numerals and will not be described.

The present invention has a structure in which the hot melt ring 21 is attached to the magnetic medium 4 on the overlapping surface of the magnetic medium 4 and the center core 6 attached to the hole 5 of the magnetic medium 4.

Specifically, the hot melt ring 21 is directly attached to the surface of the magnetic medium 4 by screen printing or the like as shown in FIG. 2A, or the hot melt ring 21 is provided as shown in FIG. 2A. In this manner, the magnetic medium 4 is mounted on the surface of the magnetic medium 4 around the hole 5 by transfer.

Next, as shown in FIG. 2 (B), the center core 6 is fitted in the hole 5 and the hot melt ring 21 is sandwiched between the magnetic media 4 and the flange portion 13 of the center core 6 to perform heat treatment. , The hot melt ring 21 is softened,
The center core 6 can be adhesively fixed to the magnetic medium 4.

3 and 4 show the hot melt ring 21.
Showing the specific manufacturing state of transfer to the magnetic media 4 of
The punching holes 23 are provided in the release paper 22 having releasability at regular intervals, and the hot melt ring 21 is formed around each punching hole 23 on the surface of the release paper 22 by means of screen printing or the like.

Hot melt ring 21 on release paper 22
May be transferred from the release paper 22 to the surface of the magnetic medium 4 and attached. Since the hot melt ring 21 is directly formed into a ring shape by screen printing, there is no waste of the forming material, it is economical, and a ring with good dimensional accuracy can be formed.

Further, since the hot melt ring 21 does not have adhesiveness when heat is not applied, other members will not adhere even if it is attached to the magnetic medium 4 in advance during the process of assembling the disk cartridge, therefore The assembly process can be performed without any problems.

The hot melt ring 21 can be exemplified by a modified olefin resin. The method of manufacturing the disk cartridge of the present invention has the above-described structure, and as shown in FIG. 2A, the hot melt ring 21 is attached in advance around the hole 5 on the surface of the magnetic medium 4 so that the magnetic medium 4 is When the center core 6 is fitted in the hole 5 and the hot melt ring 21 is sandwiched between the magnetic medium 4 and the flange portion 13 of the center core 6 and subjected to heat treatment, the hot melt ring 21 is softened to the center core 4 of the magnetic medium 4. 6 can be adhesively fixed.

[0020]

As described above, according to the present invention, since the hot melt ring is used to bond and fix the magnetic medium and the center core in the disk cartridge, the adhesive force does not occur unless the hot melt ring is heated. Even if it is attached to the medium in advance, other parts do not adhere to each other and the disc cartridge can be assembled without any trouble. The quality can be improved.

Further, the hot melt ring can be directly formed into a ring shape by screen printing, and there is no waste of material, which is advantageous in terms of resources and economy. Furthermore, since the hot melt ring can be directly formed into a ring shape by printing, the dimensional accuracy can be improved, and the separator for printing the hot melt ring can be reused, and the thickness of the hot melt ring can be made constant to improve the quality. Further, coloring the hot melt with a dye has the advantage of simplifying visual inspection or inspection with a measuring device.

By the way, as in the case of the method of the present invention, when using hot melt for adhesion, the adhesion is extremely good. When the hot melt ring is pressed by the upper and lower shafts, the adhesive performance is improved by the thickness of the hot melt even if there are minute irregularities on the bonded surface.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a disk cartridge according to the present invention.

FIG. 2A is an enlarged sectional view showing a state in which a hot melt ring is attached to a magnetic medium, and FIG. 2B is an enlarged sectional view in which a center core is bonded to the magnetic medium.

FIG. 3 is a perspective view of a tape having a hot melt ring formed thereon.

FIG. 4 is an enlarged vertical sectional view of the above.

FIG. 5 is an exploded perspective view showing a conventional disc cartridge.

FIG. 6 is an enlarged cross-sectional view in which a center core is bonded to the magnetic medium of the above.

FIG. 7 is a perspective view of a tape having a double-sided adhesive ring formed thereon.

FIG. 8 is an enlarged vertical sectional view of the above.

[Explanation of symbols]

 3 Case 4 Magnetic Media 5 Hole 6 Center Core 21 Hot Melt Ring 22 Release Paper 23 Punching Hole

Claims (3)

[Claims] 1. A method of manufacturing a disk cartridge in which a magnetic medium having a center core attached to a central hole is rotatably housed in a case, wherein a hot melt ring is attached to an overlapping surface of the magnetic medium with the center core. A method of manufacturing a disk cartridge, comprising performing heat treatment in a state where a center core is fitted in a hole of a medium, and fixing the center core to a magnetic medium by adhesive bonding with a hot melt ring. 2. The method of manufacturing a disk cartridge according to claim 1, wherein the hot melt ring is directly attached to the magnetic medium by screen printing. 3. The method of manufacturing a disk cartridge according to claim 1, wherein the hot melt ring is attached to the magnetic medium by transfer.