JP2650678B2 - Recording disk body and method of manufacturing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a recording disk such as a magnetic disk, an optical disk or an optical-magnetic disk, and more particularly to a disk and a hub fixed to the center of the disk. The present invention relates to a recording disk having the same.

[Conventional technology]

4 and 5 are partially enlarged sectional views of a magnetic disk used in a conventional magnetic disk cartridge.

In the case of FIG. 4, the pressure-sensitive adhesive layers 42, 42
Is attached to the flange portion 45 of the hub 44. Further, a magnetic sheet 46 punched in a donut shape is fixed to the hub 44 via the double-sided adhesive ring 43.

In the case of the magnetic disk shown in FIG. 5, an adhesive is applied to the flange portion 45 of the hub 44 to form an adhesive layer 47, and the magnetic sheet 46 punched into a donut shape is interposed via the adhesive layer 47. It is fixed to the hub 44.

As described above, the hub 44 and the magnetic sheet 46 are fixed by the fixing means such as the double-sided adhesive ring 43 or the adhesive layer 47, and the fixing means is white or transparent. On the other hand, as the hub 44, for example, a synthetic resin such as a stainless steel plate or polyacetal is used,
They are of metallic luster or white.

[Problems to be solved by the invention]

As described above, the hub 44 and the fixing means (double-sided adhesive ring 4
3. The adhesive layer 47) has a similar color or a color similar to the similar color. Therefore, even when the double-sided adhesive ring 43 is attached to the flange portion 45 of the hub 44 or the adhesive layer 47 is formed, the color of the hub 44 and the fixing means are not clearly distinguished, and the double-sided adhesive ring
If you forget to attach 43, it is difficult to accurately detect the non-application of the adhesive.

In addition, this inspection cannot use an automatic inspection device for the above-mentioned reason and must rely on a visual inspection, so that the workability is poor and the degree of eye fatigue of the inspector is large.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a recording disk having good workability and stable quality.

[Means for solving the problem]

In order to achieve the above object, the first aspect of the present invention is characterized in that the inner peripheral portion of the disk is directly adhered to the flange portion of the hub with an adhesive colored in a color different from the color of the flange portion. Is what you do.

In order to achieve the above-mentioned object, a second aspect of the present invention is to attach an adhesive colored to a color different from the color of the flange portion to the flange portion of the hub, and optically inspect the adhesive to adhere the adhesive. It is characterized in that the presence / absence of poor adhesion of the agent is determined, and the inner peripheral portion of the disk is pressed against the flange portion via the subsequent adhesive to adhere.

(Example of the invention)

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a magnetic disk cartridge according to an embodiment,
FIG. 2 is an enlarged plan view of a hub used in the magnetic disk cartridge, and FIG. 3 is an enlarged sectional view of a main part of a magnetic disk used in the magnetic disk cartridge.

As shown in FIG. 1, the magnetic disk cartridge is a cartridge case 1 comprising an upper case 1a and a lower case 1b.
A magnetic disk 2 rotatably housed inside the cartridge case 1, a shutter 4 for opening and closing a magnetic head insertion opening 3 opened at a predetermined position of the cartridge case 1, And a cleaning sheet (not shown) attached thereto.

As shown in FIG. 3, the magnetic disk 2 mainly includes a hub 8 made of, for example, a stainless steel plate or the like, and a magnetic sheet 9 punched in a donut shape.

The hub 8 has a positioning pin insertion opening 5 and a driving pin insertion opening 6 formed in a central projecting portion thereof, and further has a flange portion 7 integrated with the central projecting portion. The flange portion 7 and the inner peripheral portion of the magnetic sheet 9 are bonded by an adhesive layer 10.

As an adhesive constituting the adhesive layer 10, for example, one having the following composition is used.

As a main monomer, 2 ethylhexyl acrylate 50 overlapped parts butyl acrylate 30 overlapped parts As a comonomer, vinyl acetate 10 overlapped parts As a functional group-containing monomer, acrylic acid 10 overlapped parts As a solvent, ethyl acetate 100 overlapped parts To a resin solution having the above composition Then, 3 to 30 overlapping portions of toluene diisocyanate and 0.02 to 30 overlapping portions of the colorant are added to obtain a colored room-temperature pressure-sensitive adhesive. The adhesive is applied to the flange portion of the hub as described above, and after drying, the magnetic sheet is bonded under the conditions of 20 ° C. and 40% humidity.

As the colorant, an organic dye or an organic pigment is preferable in consideration of solubility and dispersibility in an organic solvent.

As a black organic dye, for example, Acid Blue Black10B
(Acid dye), Nigrosine (acid dye), Alizarine Fa
st Gray BBLW (acid dye), Chrome Black A (mordant dye), Disperse Diazo Black D (disperse dye),
And Remazol Black B (reactive dye).

Examples of the black organic pigment include Pig. Black 1 and Diamond Black, which are made of an oxidized condensate of aniline.

FIG. 2 is a view for explaining an example of an application pattern of the adhesive 11 on the flange 7. Although not shown, the center pin of the adhesive application device is inserted into the positioning pin insertion port 5 of the hub 8, while the drive pin of the adhesive application device is inserted into the drive shaft insertion port 6. The center pin positions the hub 8 on the coating device, and the drive pin rotates the hub 8 in a predetermined direction.

Above the hub 8, an adhesive discharge nozzle mounted so as to be slightly movable in the radial direction is arranged. As shown in the figure, the adhesive 11 is first applied in a circumferential shape around the outer periphery of the flange portion 7 with the rotation of the hub 8, and when the hub 8 has rotated nearly one round, the hub 8 is rotated. While slightly moving the nozzle inward in the radial direction.
Thereafter, the hub 8 is rotated substantially once, and the operation of applying the adhesive is completed. By performing such an operation, an outer peripheral protruding shape 11a, an inner peripheral protruding shape 11b, and an inclined connecting protruding shape connecting one end of the outer peripheral protruding shape 11a and one end of the inner peripheral protruding shape 11b by the adhesive 11 are formed. 11c are provided continuously.

In this example, the outer peripheral protrusion 11a and the inner peripheral protrusion 11b are provided on concentric circles. In addition, the nozzle is gradually moved radially inward or radially outward with the rotation of the hub 8. Then, the adhesive 11 can be applied in a spiral shape of two or three threads. In any case, the adhesive area is made as large as possible, and the adhesive can be applied uniformly in the circumferential direction.

After the adhesive 11 is applied in this manner, the hub 8 is automatically conveyed to a coating inspection device provided with an optical detection element, and the application state of the adhesive 11 is optically inspected by the device. Then, uneven application or breakage of the adhesive, or adhesive that has overflowed the adhesive is automatically selected and discharged to the outside of the apparatus. As described above, the adhesive 11 is colored (for example, colored in black), and the reflectance of the adhesive 11 and the flange portion 7 is greatly different from each other, so that the visibility is high and the application state of the adhesive 11 is surely optically ensured. Can be recognized.

After this coating inspection, the inner peripheral portion of the magnetic sheet 9 punched in a donut shape is placed on the flange portion 7 and a predetermined pressing force is applied. Thereby the uncured adhesive
11 outer peripheral projection 11a, inner projection 11b and connecting projection
11c is crushed to form an adhesive layer 10 having a uniform thickness, and the hub 8 and the magnetic sheet 9 are bonded well.

In the above embodiment, the case where the adhesive colored black is used is described, but the present invention is not limited to this, and the adhesive may be colored other colors such as red and green.

In the above embodiment, the case where a metal hub is used has been described. However, the present invention can be applied to a hub made of synthetic resin or ceramic.

Although the case of the magnetic disk has been described in the above embodiment, the present invention can be applied to other recording disk bodies such as an optical disk and an optical-magnetic disk.

Also, a colored layer having a complementary color relationship with the adhesive is formed on the surface of the flange portion of the hub to make the color distinction from the adhesive more clear, or a predetermined surface is provided to improve the applicability of the adhesive. The surface can be roughened with roughness.

In the above embodiment, the case of fixing with an adhesive has been described. However, the present invention is also applicable to a well-known means for fixing a double-sided adhesive ring as shown in FIG. 4, for example.

〔The invention's effect〕

The present invention is configured as described above, and since the distinction between the flange portion of the hub and the color of the adhesive applied to the hub becomes clear, the selection of defects such as forgetting to apply the adhesive, uneven application, disconnection of the application, or protrusion. Is easily and reliably performed. Therefore, occurrence of various troubles due to poor application of the adhesive is eliminated, and the quality of the recording disk body can be improved.

Also, since the color of the flange portion of the hub and the color of the adhesive applied to the hub are clearly distinguished, an automatic inspection device for inspecting the application state of the adhesive can be used, and the inspection can be automated and the workability can be improved. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a magnetic disk cartridge according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a hub used in the magnetic disk cartridge, and FIG. 3 is a main part of a magnetic disk used in the magnetic disk cartridge. 4 and 5 are partially enlarged sectional views of a conventional magnetic disk. 2 ... magnetic disk, 7 ... flange, 8 ... hub,
9 ... magnetic sheet, 10 ... adhesive layer, 11 ... adhesive.

Claims (3)

(57) [Claims] 1. A recording disk unit wherein the inner peripheral portion of a disk is directly bonded to a flange portion of a hub with an adhesive colored in a color different from the color of the flange portion. 2. In claim (1),
A recording disk body, wherein the disk is made of a flexible sheet. 3. An adhesive colored to a color different from the color of the flange portion is attached to the flange portion of the hub, and the adhesive is optically inspected to determine whether or not the adhesive is defective. A method for manufacturing a recording disk body, wherein the inner peripheral portion of the disk is pressed against the flange portion with an adhesive and then bonded.