JPH02146133A - Magneto-optical disk medium - Google Patents

Abstract

PURPOSE:To execute processes of temporary adhesion and regular adhesion at a same time and to shorten the work time by using two hubs for fixing a disk and providing one hub to be jointed to a driving shaft with grooves for applying an adhesive and for absorbing the excess adhesive on the surface facing to the disk. CONSTITUTION:The magneto-optical disk 17 is fixed between the hubs 22b, 23b into which the driving shaft is inserted. The surface of the hub 22b facing to the disk 17 has groves 26a, 26b for adhesives and grooves 27a for absorbing the excess adhesive. The groove 26a is filled with a UV-curing resin adhesive 25d for temporary adhesion, the groove 26b is filled with an adhesive 24d for regular adhesion. A disk 17 is mounted on the hub 22b to execute the processes of temporary adhesion and regular adhesion at a same time. The excess adhesives from the grooves 26a and 26b respectively flows into the grooves 27a and do not mix each other. Immediately after positioning the center of the disk at the center of the hub 22b, they are temporarily fixed by irradiating UV light. By this method, adhesion of the disk and adhesion of hubs can be performed at a same time, which reduces processes of centering and shorten the work time.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a magneto-optical disk medium of a magneto-optical disk device used as a file device in a computer system, by making it possible to simultaneously bond magneto-optical disks together and bond them to a hub. , with the aim of shortening assembly work time and realizing a magneto-optical disk medium that does not leave temporary fixing marks, is a magneto-optical disk medium in which a magneto-optical disk is sandwiched between hubs into which a drive shaft is inserted. On the surface of the hub facing the magneto-optical disk, there is an adhesive groove and
It has a structure with protruding absorption grooves.

[Industrial Application Field] Magneto-optical disk media of magneto-optical disk devices used as file devices in computer systems;
In particular, it relates to a fixing structure between a magneto-optical disk and a hub.

[Overview of magneto-optical disk media]

FIG. 5 is a perspective view showing the entire structure of the magneto-optical disk medium.

The magneto-optical disk medium includes a magneto-optical disk 17 which is a recording medium, and two hubs 22a and 23a into which the drive shaft of the magneto-optical disk medium is inserted when the magneto-optical disk medium is attached to a magneto-optical disk device. It consists of

The magneto-optical disk 17 has two magneto-optical disks stuck together so that the upper and lower surfaces of the disk surface can be used as recorded images, and further includes two hubs 22a.

23a.

Next, the manufacturing process of this magneto-optical disk medium will be explained.

FIG. 6 is a process diagram illustrating the manufacturing process of a magneto-optical disk medium. The manufacturing process is roughly divided into three processes, and a magneto-optical disk medium is completed through a substrate process, a film forming process, and an assembly process.

FIG. 7 is a diagram illustrating a substrate process using a 2 P (photo-polymer) transfer method. The substrate process will be explained along the process diagram of FIG.

First, the surface of the tempered glass substrate 1 is polished in a polishing step 2, and then the tempered glass substrate is cleaned in a cleaning step 3.

Next, between the stand bar 4 and the tempered glass substrate 1, 2P
(Photo-polymer) Filled with resin 5, molded, and irradiated with ultraviolet rays 15. Since 2P resin is a resin that hardens when exposed to ultraviolet rays, when the stand bar 4 is separated after the 2P resin has hardened, the 2P transfer step 6 is completed and a 2P resin layer 5 is formed on the tempered glass substrate 1. The substrate 16 is completed. At this time, a spiral guide groove 18a is formed in the substrate 16 by the stand bar 4. The thickness of the substrate 16 is about 1.2 mm.

The process of forming a recording film on the base Fi 16 manufactured in this manner is a film forming process. FIG. 8 shows a magneto-optical disk 17 on which a recording film is formed by a film-forming process.
FIG. 2 is a partially cutaway perspective view and an enlarged view of the end face of the cut portion.

The film forming process consists of a base film sputtering step 7, a recording film sputtering step 8, and a protective film sputtering step 9.
A base film 19, a recording film 20, and a protective film 21 are formed by sequential sputtering on the film a. At this time,
The thickness of each film is about 0.1 μm, the width W of the guide grooves 18 is about 1 μm, and the interval P between the guide grooves 18 is 0.66 μm.
The depth H of the guide groove 1B is about 0.07 μm.

The formed magneto-optical disk is completed as a magneto-optical disk medium through an assembly process. FIG. 9 is a perspective view illustrating this assembly process.

The assembly process consists of two magneto-optical disks 17a and 1
7b with adhesive, and put 2 on this magneto-optical disk.
The process is completed by bonding the two hubs 22a and 23a, but the magneto-optical disk is initialized in a recording film initialization step 10 and then bonded together. Further, after the assembly is completed, the magneto-optical disk medium is tested in a unit test step 13 before being shipped.

The present invention relates to a magneto-optical disk medium that facilitates the assembly process described above.

[Conventional technology]

First, the conventional assembly process will be explained in detail. FIG. 10 is a diagram illustrating a conventional assembly process. In order to make the explanation easier to understand, FIG. 10 is an end view of a cut section where a magneto-optical disk medium is cut in the axial direction from the center thereof.

Step 2: Set the magneto-optical disk 17a on a stage (not shown) with the recording film facing upward;
Align the rotational center point of the guide groove with the rotational center point of the stage in a.

At this time, the center point of the guide groove of the magneto-optical disk is determined by rotating the stage, tracing the magneto-optical disk guide groove with an optical pickup, and measuring the amount of eccentricity of the guide groove. (Hereafter, the center point of the guide groove is determined in the same way.) Process ① Apply adhesive 24a to the magneto-optical disk 17a, and attach another magneto-optical disk 17b with the recording film facing downward. . The adhesive used at this time is, for example, an epoxy adhesive.

Step (2) Align the center point of the guide groove of the bonded magneto-optical disk 17b with the center point of the guide groove of the magneto-optical disk 17a.

Step (2) UV resin 25a is applied to several places on the outer periphery of the side surfaces of the magneto-optical disks 17a and 17b, and UV light is irradiated to harden the UV resin. At this time, when the UV resin is irradiated with UV light,
Hardens in seconds.

In this process, the UV resin is applied to the magneto-optical disks 17a and 17b.
The reason why it is used on the outer periphery of the side surface of This is for the purpose of In other words, it is a temporary fix.

Step (2) The inner hub 22a is set on a stage not shown, and adhesive 24b is applied to the adhesive surface with the magneto-optical disk. Thereafter, the magneto-optical disk manufactured in step (2) is bonded to the hub 22a.

Step (2) Align the center point of the guide groove of the magneto-optical disk with the center point of the hub 22a.

Step 2: Apply UV resin 25b to several places between the hub 22a and the magneto-optical disk, irradiate UV light to harden the UV resin, and temporarily fix the disk.

Step (2) The outer hub 23a whose adhesive surface with the magneto-optical disk is coated with adhesive 24c is inserted into the outer side of the hub 22a. Next, UV resin 25c is applied to several places between the hubs 22a and 23a, and UV light is irradiated to cure the UV resin and temporarily fasten the hubs 22a and 23a.

Through the above steps, assembly of the magneto-optical disk medium is completed.

[Problem to be solved by the invention]

Information is read and written to and from a magneto-optical disk medium by rotating the magneto-optical disk medium and tracing a guide groove using an optical pickup.

Therefore, when the magneto-optical disk medium is used in a magneto-optical disk device, it is important that the center of rotation of the guide groove is not eccentric.

Therefore, in the magneto-optical disk medium, the rotation center point of the guide groove of the magneto-optical disk 17a,
It is necessary to match the rotational center point of the guide groove b and the rotational center point of the hub 22a.

Therefore, in the conventional assembly process, as explained above, the bonding of the magneto-optical disks and the hub bonding were performed separately.

However, this method has the following problems.

(b) It is necessary to align the center of rotation three times, which increases the working time.

That is, after determining the rotation center point of the guide groove of the magneto-optical disk 17a in step (2), aligning the rotation center point of the guide groove of the magneto-optical disk 17b with the rotation center point in step (2), and then, in step (2) The magneto-optical disk and hub 22a
In order to match the rotation center of the
A total of 3 times is required.

(b) Time for the adhesive 24a to harden is required between process (2) and process (2), and during this time it is not possible to move on to the next operation.

That is, only after the adhesive 24a is completely cured.
This is because there is a risk that the rotation centers of the guide grooves between the magneto-optical disks may be misaligned, and from the viewpoint of adhesive strength, etc.
This is because the curing time of the adhesive 24a cannot be shortened.

(c) In step (2), the magneto-optical disks 17a and 17b are temporarily attached to the outer periphery of the side surfaces, so if the adhesive 24a protrudes to the outer periphery of the side surfaces of the magneto-optical disks in step (2), remove the adhesive. There is a need.

This also applies when temporary fixing is performed at the inner periphery of the side surface of the magneto-optical disk.

(d) Since the magneto-optical disks 17a and 17b are temporarily fastened to the outer periphery of the side surfaces, traces of the temporary fastening remain after the media are completed, which is unfavorable in terms of appearance.

(e) Temporary fixing work is required three times, which increases the working time.

That is, in step (2), the magneto-optical disk 17a and magneto-optical disk 17b are temporarily attached, in step (2), the hub 22a and the magneto-optical disk are temporarily attached, and in step (2), the hub 22a and the hub 23a are temporarily attached.

The technical problem of the present invention is to solve such problems in the assembly process of magneto-optical disk media, and to shorten the assembly work time by making it possible to bond magneto-optical disks together and bond them to the hub at the same time. At the same time, it is an object of the present invention to realize a magneto-optical disk medium that leaves no traces of temporary fixing.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the basic principle of the present invention, and is a perspective view of a magneto-optical disk medium cut from the center in the direction of the rotation axis.

The magneto-optical disk 17 is inserted into the hub 22b into which the drive shaft is inserted.
A magneto-optical disk medium is constructed by sandwiching and fixing the disk and the hub 23b. Adhesive grooves 26a, 26b and a protruding absorption groove 27a are provided on the surface of the hub 22b facing the magneto-optical disk 17.

(Function) FIG. 2 is a diagram illustrating the function of the adhesive groove and the protruding absorption groove according to the present invention, and is an end view of a cut portion of the magneto-optical disk medium cut from the center in the direction of the rotation axis.

In this case, adhesive groove 26a126b provided in hub 22b
The protruding absorption groove 27a operates as follows.

That is, adhesive 24a, which is a temporary fixing adhesive, is applied to the adhesive groove 26a, and adhesive 25d, which is a permanent fixing adhesive, is applied to the adhesive groove 26b.Next, this hub 22b is applied. The magneto-optical disk 17 is placed on the disk, and temporary adhesion and permanent adhesion are performed at the same time. At this time, the overflowing adhesive flows into the overflow absorption groove 27a, and the adhesive 24d and the adhesive 25d are not mixed together. Therefore, hub 2
2b and the center point of the magneto-optical disk 17, then
Temporary fixing can be completed immediately by irradiating V light.

Therefore, it is no longer necessary to apply the temporary fixing adhesive again after aligning the center point as in the conventional case, and there is no shift in the center point due to the process of applying the temporary fixing adhesive. Therefore, we need to bond magneto-optical disks together,
Even if the hub adhesion is performed at the same time, the center point is less likely to shift, and it becomes possible to perform the hub adhesion and the adhesion of the magneto-optical disks at the same time, which was conventionally done side by side.

〔Example〕

Next, how the magneto-optical disk medium according to the present invention is actually implemented will be explained using examples.

FIG. 3 shows the magneto-optical disk medium according to the present invention.
FIG. 3 is a plan view and a cut-away end view of the hub.

All of the embodiments (a), (b), and (c) in the same figure have adhesive grooves and protruding absorption grooves to prevent temporary fixing adhesive and permanent fixing adhesive from mixing. It is composed of

(a) In the hub 22c shown in the figure, temporary adhesive is applied to the adhesive groove 26c, and the absorption groove 27b protrudes around the adhesive groove 26c.
It has been established. Further, the final fixing adhesive is applied to the adhesive application area 28, and the overflowing adhesive is absorbed into the overflow absorption groove 27c.

(b) In the hub 22d shown in the figure, temporary adhesive is applied to the adhesive groove 26d, and on the inner and outer concentric circles,
A protruding absorption groove 27d is provided.

Further, the final fixing adhesive is applied to the adhesive cutting groove application area 29, and the adhesive that protrudes is absorbed into the protruding absorption groove 27d.

In the hub 22e shown in FIG. 3(c), an adhesive for permanent fixing is applied to the adhesive groove 26e, and an adhesive for temporary fixing is applied to the adhesive groove 26f. Moreover, a protruding absorption groove 27e is provided between both adhesive grooves to absorb the protruding adhesive.

Next, a process for assembling a magneto-optical disk medium using this hub 22e will be explained. FIG. 4 is a diagram illustrating the assembly process, and is an end view of a cut portion where the magneto-optical disk medium is cut in the axial direction from the center thereof.

Step 2: Set the hub 22e on a stage not shown in the figure, and apply adhesive 24e and UV resin 25e.

Step (2) The magneto-optical disk 17a is attached to the hub 22e, and the adhesive 24f is applied to the magneto-optical disk 17a.

Process■ Align the center point of the guide groove of the magneto-optical disk 17a with the hub 22e.
The hub 22e and the magneto-optical disk 17a are temporarily attached by irradiating UV light to harden the UV resin.

Step (2) A magneto-optical disk 17b is pasted onto the magneto-optical disk 17a, and the center point of the guide groove of the magneto-optical disk 17b is aligned with the center point of the hub 22e.

Process ■ Hub 23 with adhesive applied to the adhesive surface with the magneto-optical disk
b into the outside of the hub 22e. Next, hub 2
UV resin 25f is applied in several places between the hub 3b and the magneto-optical disk 17b, and at the same time, UV resin 25f is applied in several places between the hub 23b and the hub 22e, and UV light is irradiated to remove the UV resin. Let it harden and temporarily fix it.

Through the above steps, the assembly of the magneto-optical disk medium is completed, and the hub and the magneto-optical disks can be bonded together at the same time.

Incidentally, the deviation of the center point in this example is 5 to 8.
This is comparable to the conventional case where magneto-optical disk adhesion and hub adhesion were performed separately using 5μ steel.

〔Effect of the invention〕

The magneto-optical disk medium of the present invention has the following effects by simultaneously bonding the hub and the magneto-optical disks to each other.

(b) The center of rotation only needs to be aligned twice, reducing work time.

That is, in step (2), the magneto-optical disk 17a and the hub 22e are
It is only necessary to align the center points of the magneto-optical disk 17b and the hub 22e in step (2).

(b) Since it is not necessary to individually bond magneto-optical disks together, there is no need for the conventional adhesive curing time between magneto-optical disks, and the working time is shortened.

(c) There is no need to temporarily fix the outer periphery of the side surface of the magneto-optical disks when the magneto-optical disks are bonded together, and it becomes easier to wipe off the adhesive that bulges out when the magneto-optical disks are bonded together.

(d) There is no need to temporarily fix the outer periphery of the side surface of the magneto-optical disks when the magneto-optical disks are bonded together, and there are no temporary fixing marks after the medium is formed, improving the appearance.

In this way, the work can be done easily and the work time can be shortened. By the way, conventionally, medium 1
While the manufacturing time required for each disk was approximately 30 minutes, the assembly of the magneto-optical disk medium of the present invention can be completed in approximately 15 minutes. Moreover, the aesthetic appearance of the outer periphery of the side surface of the medium can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the basic principle of the present invention, and is a perspective view of a magneto-optical disk medium cut from the center. FIG. 2 is a cutting section of the magneto-optical disk medium cut from the center for explaining the operation. 3 is a plan view and a cut end view of the hub of various embodiments, FIG. 4 is a diagram explaining the assembly process of the embodiment, and FIG. 5 is a diagram showing the entire structure of the magneto-optical disk medium. 6 is a process diagram illustrating the manufacturing process of a magneto-optical disk medium; FIG. 7 is a sectional view and a perspective view illustrating a substrate process using a 2P (photo-polymer) transfer method;
8 is a partial cutaway view of the magneto-optical disk medium and an enlarged view of the end face of the cut portion, illustrating the structure of the recording film; FIG. 9 is a perspective view illustrating the assembly process;
The figure is a cross-sectional view showing the conventional assembly process in order of steps.
It is. In the figure, 1 is a tempered glass substrate, 2 is a polishing process, 3 is a cleaning process, 4 is a stand bar 15 is 2P resin, 6 is a 2P transfer process, 7 is a base film sputtering process, 8 is a recording film spatter process, and 9 is a 10 is a recording film initialization process, 11 is a veneer bonding process, 12 is a hub bonding process,
13 is a unit test process, 14 is a completed magneto-optical disk medium, 15 is an ultraviolet ray, 16 is a substrate, 17 and 17a and 1
7b is a magneto-optical disk, 18 is a guide groove, 19 is a base film,
20 is a recording film, 21 is a protective film, 22a and 22b, 2
2c, 22d, 22e, 23a, 23b are hubs, 24a
and 24b, 24c, 24d, 24e, 24
f is adhesive for final fixing, 25a and 25b, 25c,
25d, 25e, 25f are temporary adhesives with UV protection.
Resin, 26a and 26b, 26c, 26d, 26e,
26f is an adhesive groove, 27a and 27b, 27c,
27d and 27e are protruding absorption grooves, and 28 and 29 are adhesive application areas, respectively. Patent Applicant Fujitsu Limited Sub-Agent Patent Attorney Yasushi Fukushima Text @IyoII"1c2) 2) 1; 1j, 21: (, Note) Resistant tW 7th section membrane configuration 8th concave

Claims (1)

[Claims] The magneto-optical disk (17) is inserted into the hub (in which the drive shaft is inserted).
22b) and the other hub (23b), adhesive grooves (26a), (26b) are formed on the surface of the hub (22b) facing the magneto-optical disk (17); A magneto-optical disk medium characterized in that a protruding absorption groove (27a) is provided.