JPH02199639A - Production of tightly bonded optical disk and tray for transporting optical disk veneer - Google Patents

Abstract

PURPOSE:To improve productivity by using a parallel flat plate type tray formed with a recess into which a hub can be inserted on an optical disk veneer imposing surface. CONSTITUTION:The optical disk veneer 2 which is formed with a recording layer 3 on one surface and is attached with the hub 4 in the central part and the tray 11 formed with the recess 13 into which the hub 4 can be inserted in the optical disk veneer imposing surface are formed. The optical disk veneer 2 with the recording layer 3 faced upward is imposed on the tray 11 and the superposed assembly of the optical disk veneer 2 and the tray 11 is fed to a roll coater 7 for an adhesive agent to transfer an adhesive layer 1 on the recording layer 3. On the other hand, signal patterns are formed around a spindle hole 8 bored to this hub 4. The patterns having the high centering accuracy of the signal patterns is efficiently produced in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a closely bonded optical disc, and a tray for transporting a single optical disc used therein.

[Conventional technology]

As shown in FIG. 19, it is a close-contact bonded optical disk in which two optical disk single plates 2 are bonded together concentrically with the recording layer or reflective layer 3 inside with an adhesive layer 1 interposed therebetween. It has been proposed that a hub 4 is attached to the center of a single optical disk 2 that protrudes outward from the light incident surface 2a.

In a type of closely bonded optical disc that does not have a hub 4, an adhesive application method is adopted in which the recording layer or reflective layer 3 of the optical disc single plate 2 is coated with a hot melt adhesive using a roll coater. Although this has a great effect on improving productivity, when the hub 4 is attached to the optical disc veneer 2 in advance, the hub 4 becomes an obstacle and makes it difficult to smoothly insert the optical disc veneer 2 into the roll coater. I can't.

Therefore, in the case of a closely bonded optical disc of the type with a hub 4 attached, first, as shown in FIG. A plate 2 is prepared, and then, as shown in FIG. 21, a hot melt adhesive 1 is coated on the upper surface of the recording layer or the reflective layer N3 using a roll coater 7. A method of attaching a hub 4 to the outer surface of the central portion of each optical disk single plate 2 after bonding these two optical disk single plates 2 together, as shown in FIG. 19, has been considered.

[Problem to be solved by the invention]

However, according to the above manufacturing method, the hub 4 is attached to the transparent substrate 5.
When attaching the hub 4 to the center of the signal pattern 6, the center of the signal pattern 6 formed in a spiral or concentric circle is cut using, for example, an optical microscope, the center of the hub 4 is aligned with the center of the signal pattern 6, and both members 4 and 5 are attached. Complex and highly skilled work such as joining must be performed, resulting in poor workability and productivity.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a closely bonded optical disc with excellent productivity, and to provide a tray for transporting a single optical disc that makes it possible.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides an optical disk single plate having a recording layer or a reflective layer formed on one side and a hub attached to the center, and an optical disk single plate in which the hub can be inserted into the mounting surface of the optical disk single plate. A parallel plate-like tray having a recessed portion formed therein is prepared, and the optical disc single plate is placed on the tray with the recording layer or reflective layer facing upward, and a polymer of the optical disc single plate and the tray is prepared. The adhesive was fed into an adhesive roll coater to transfer the adhesive layer onto the recording layer or reflective layer.

In addition, regarding the tray for transporting a single optical disk, the optical disk single plate mounting surface and the lower surface are formed parallel and flat, and a hub attached to the optical disk single plate is inserted in the center of the optical disk single plate mounting surface. A recess into which it can be inserted is formed.

[Effect]

When the hub attached to the single optical disc is inserted into the recess formed in the tray and the light incident surface of the single optical disc is placed on the single optical disc mounting surface of the tray, the bottom surface of the tray and the single optical disc are The surface on which the recording layer or reflective layer is formed can be arranged substantially parallel to the surface. Therefore, it is possible to insert a single optical disk to which a hub has been attached in advance into the roll coater, and it is possible to uniformly apply the adhesive onto the surface on which the recording layer or reflective layer is to be formed.

On the other hand, if a hub is attached to the approximate center of the transparent substrate and the signal pattern is formed around the spindle hole opened in this hub, the center of the spindle hole and the center of the signal pattern can be precisely aligned. can be done. Therefore,
Optical discs with high centering accuracy of signal patterns can be efficiently manufactured.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, as shown in FIG. 1, an optical disk single plate 2 is prepared, in which a recording layer or a reflective layer 3 is formed on the signal pattern 6 forming surface of a transparent substrate 5, and a hub 4 is attached to the center.

The transparent substrate 5 is made of glass or a transparent resin material such as polycarbonate, polymethyl methacrylate, polymethyl pentene, or epoxy, and has a center hole 5a in the center.
It is formed into a disc shape with a

The hub 4 has a spindle hole 8 for inserting a spindle provided in the optical disk drive, and the spindle hole 8 is made concentric with the center hole 5a formed in the transparent substrate 5, and a It is bonded to the light incident surface 2a of the substrate 5. The material, structure, etc. of this hub 4 can be appropriately designed as necessary.

For example, the hub of an optical disk used in a magnetic clamp type optical disk drive device is made of a magnetic material with excellent wear resistance, such as magnetic stainless steel. On the other hand, the hub of an optical disk applied to a mechanical clamp type optical disk drive device is made of a metal material with excellent wear resistance such as non-magnetic stainless steel.

Furthermore, as shown in FIG. 1, the hub 4 can be directly bonded to the transparent substrate 5, or in order to alleviate the thermal stress acting on the transparent substrate 5, the hub 4 can be housed in a resin holder. This holder can also be bonded to the transparent substrate 5.

The signal pattern 6 is formed spirally or concentrically around the spindle hole 8 of the hub 4.

As the means for forming the signal pattern 6, an appropriate method is applied depending on the material of the transparent substrate 5.

For example, when the transparent substrate 5 is formed of a thermoplastic resin such as polycarbonate, a so-called injection method is suitable. Regarding this substrate material, pressure is applied after injecting the molten substrate material into an injection mold.
A forming means such as a so-called compression method or an injection-compression method can also be applied.

Furthermore, when the transparent substrate 5 is made of a thermosetting resin such as glass or epoxy, the photocuring resin is spread between the substrate 5 and a standber on which a reverse pattern of the desired signal pattern is formed. Then, the 62P method (Photo-polymeriz
cation; photocurable resin method) is suitable. For thermosetting resins such as epoxy, molten substrate material is intravenously injected into the mold to form transparent substrate 5 and signal pattern 6.
It is also possible to apply a so-called cast molding method in which the two are integrally molded.

The recording layer or reflective layer 3 is formed by a thin film forming method such as sputtering or vacuum deposition. Note that the recording layer is formed on a single write-once optical disc 2, and the reflective layer is formed on a single read-only optical disc.

At the same time, a tray 11 for transporting a single optical disk as shown in FIGS. 2 and 3 is manufactured.

As shown in this figure, the tray 11 for transporting a single optical disc is formed into a rectangular shape with one side slightly longer than the diameter of the single optical disc to be transported. . The upper surface 14 of this tray 11 is recessed with a circular optical disk single plate mounting surface 12 that has a diameter that allows the optical disk single plate to be inserted therein and is slightly shallower than the thickness of the optical disk single plate. A concave portion 13 into which the hub 4 can be inserted is provided in the center of the optical disk single plate mounting surface 12 .

The depth D of the optical disk single plate mounting surface 12 is the same as that of the tray 11.
The adhesive-applied surface of the optical disk single plate 2 protrudes from the upper surface 14 and is formed at such a depth that the adhesive from the roll coater does not adhere to the upper surface 14 of the tray 11. This depth D is appropriately designed taking into account the viscosity of the adhesive, etc. 1. Usually, it is formed so that the adhesive coated surface of the optical disc single plate 2 protrudes from the upper surface 14 of the tray 11 by at least 0.5 mm. .

Next, as shown in FIG. 4, the optical disk single plate 2 is placed on the tray 11 with the recording layer or reflective layer 3 facing upward, and the polymer of the optical disk single plate 2 and the tray 11 is bonded with an adhesive. to form an adhesive layer 1 on the recording layer or reflective layer M3. The thickness of this adhesive layer 1 can be adjusted arbitrarily, but is usually 15 μm to 30 μm.
It is made to about m.

Finally, as shown in FIG. 5, the two optical disk single plates 2 on which the adhesive layer l has been formed as described above are concentrically bonded using a jig 15 to form a closely bonded optical disk. do.

The method for manufacturing the closely bonded optical disc of the above embodiment is as follows:
Since the signal pattern 6 is formed using the spindle hole 8 of the hub 4 attached to the transparent substrate 5 as a reference, the accuracy of the alignment of the signal pattern 6 is high, and the track density can be increased.

Furthermore, the single optical disc 2 is mounted on the tray 11 and transported to the roll coater 7.

It becomes possible to roll coat the adhesive onto the optical disc single plate 2 to which the hub 4 is attached in advance, and it is possible to improve the productivity of this type of tightly bonded optical disc.

Hereinafter, a modification of the tray 11 for transporting a single optical disc applicable to the present invention will be described.

Tray 11 for transporting a single optical disc in FIGS. 6 and 7
has a rectangular outer shape with two sides slightly longer than the diameter of the single optical disc and two sides slightly shorter than the diameter, and has an arc-shaped single optical disc mounting surface 12 on its upper surface 14. A recessed portion 13 into which the hub 4 can be inserted is provided in the center of the single optical disk mounting surface 12 .

The tray 11 for transporting a single optical disk according to this embodiment is as follows.

Since a part of the optical disk veneer 2 can be made to protrude outside from the tray 11, if it is conveyed to the roll coater 7 from the end surface A where the continuous arc-shaped optical disk veneer mounting surface 12 is formed, Even if adhesive stringiness occurs between the optical disc single plate 2 and the roll coater 7 at the stage when coating is completed, the tray 11 will not be soiled.

Tray 11 for transporting a single optical disc in FIGS. 8 and 9
is formed into a circular shape with an outer diameter equal to or smaller than the diameter of a single optical disc, and a recessed portion 13 into which the hub 4 can be inserted is provided in the center thereof.

This tray 11 for transporting a single optical disc allows the outer periphery of the single optical disc 2 to protrude from the outer peripheral surface of the tray 11, so that it is more effective in preventing staining of the tray due to stringing of the adhesive.

The tray 11 for transporting a single optical disc shown in FIGS. 1O and 11 has a circular outer shape with a diameter slightly larger than the diameter of the single optical disc, and has a diameter that allows the single optical disc to be inserted into the upper surface 14. and a circular optical disc single plate mounting surface 12 shallower than the thickness of the optical disc single plate, and a recess into which the hub 4 can be inserted into the center of the optical disc single plate mounting surface 12. The portion 13 is recessed.

The tray 11 for transporting a single optical disk according to this embodiment is as follows.

In addition to producing the same effects as those of the first embodiment, since the outer shape is circular, there is an advantage that the tray is lightweight.

In the tray 11 for transporting a single optical disk shown in FIG. 12, a central shaft 16 having a diameter that can be inserted into the spindle hole 8 formed in the hub 4 is provided protruding from the center of the recessed part 13. The length of this central axis 16 is:

It is formed so as not to protrude upward from the upper surface 14 of the tray 11.

The tray 11 for transporting a single optical disk according to this embodiment has a central shaft 16 protruding from the center of the concave portion 13, which has the effect of holding the single optical disk 2 in a fixed position.

Of course, since the length of the central axis 16 is set so as not to protrude beyond the upper surface 14 of the tray 11, it does not pose any problem during roll coating.

In addition to this embodiment, the central shaft 16 may be provided protruding from the center of the concave portion 13 for all types of trays 11 for transporting single optical disks shown in FIGS. 5 to 8.

In the tray 11 for transporting a single optical disk shown in FIG. 13, a magnet 17 is embedded in the bottom surface of the recessed part 13.

The tray 11 for transporting a single optical disk according to this embodiment has the effect of attracting the hub 4 formed of a magnetic material and fixing the single optical disk 2 .

In the tray 11 for transporting a single optical disk shown in FIG. 14, a central shaft 16 is provided protruding from the center of a recessed portion 13, and a magnet 17 is embedded in the bottom surface of the recessed portion 13. The diameter of the center shaft 16 is set to a size that allows the center shaft 16 to be inserted into the spindle hole 8 formed in the hub 4, and the length of the center shaft 16 is set to a size that allows the center shaft 16 to be inserted into the spindle hole 8 formed in the hub 4.
It is formed to a less protruding size.

Since the tray 11 for transporting a single optical disc of this embodiment is configured to fix the single optical disc 2 using both the central shaft 16 and the magnet 17, the effect of fixing the single optical disc 2 is even higher.

The tray for transporting a single optical disk in FIG.
A through hole 18 is provided in the center of the tray, penetrating to the back surface of the tray.

In the tray for transporting a single optical disc of this embodiment, after forming the adhesive layer 1, a rod-shaped jig for centering the single optical disc 2 is inserted into the spindle hole 8 of the hub 4 through the through hole 18. This makes it possible to easily bond the two optical disk single plates 2 together.

In the tray for transporting a single optical disk shown in FIG. 16, two optical disk single plate mounting surfaces 12 are recessed in the upper surface 14 of one tray 11, and the central part of each optical disk single plate mounting surface 12 is recessed. A recessed portion 13 is provided. In addition, in this example, two optical disk single plate mounting surfaces 12 are placed on one tray II.
Although shown in the figure, two or more optical disk single plate mounting surfaces 12 may be formed on one tray.

Since the tray for transporting a single optical disk of this embodiment has two or more single optical disk mounting surfaces 12 formed on one tray, the efficiency of forming the adhesive layer 1 and the production efficiency of the tightly bonded optical disk are high.

In the tray for transporting a single optical disc shown in FIG. 17, the two trays 11 are rotatably connected via a connecting member 19, and at least one pair of positioning plates are provided on opposing surfaces of these two trays 11. Means 20 are formed.

The tray for transporting single optical disks of this embodiment can bond two single optical disks 2 together by coating the trays with adhesive and then folding the two trays 11 inward. Optical disc productivity is even higher.

In addition, in order to prevent the optical disc single plate 2 from falling off when the two trays 11 are folded, it is more preferable to take measures such as embedding a magnet in the lower surface of the recessed part 13.

In addition, the gist of the present invention is not limited to those described in each of the embodiments described above, and the techniques shown in each of the embodiments described above may be combined as appropriate.

Further, in the embodiment described above, the hub 4 was bonded to the light incident surface 2a of the transparent substrate 5, but the gist of the present invention is not limited thereto. For example, as shown in FIG.
is formed into a bowl shape having an engaging part 4a, a clamp part 4b with a spindle hole 8, and a connecting part 4c connecting these parts, and the engaging part 4a is recessed in the signal pattern 6 forming surface of the transparent substrate 5. It is also possible to fit and join within the stepped portion 21 provided.

In this way, even if the joint between the hub 4 and the transparent substrate 5 is separated, the hub 4 will not fall off the transparent substrate 5, and the optical disk drive device can be prevented from being destroyed.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to roll coat an adhesive onto a single optical disc to which a hub has been attached in advance, and it is possible to efficiently manufacture a tightly bonded optical disc having a hub.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams for explaining the method for manufacturing a closely bonded optical disc according to the present invention, in which Figure 1 is a cross-sectional view of a single optical disc, and Figure 2 is a diagram for transporting a single optical disc. FIG. 3 is a plan view of the tray, FIG. 3 is a cross-sectional view thereof, FIG. 4 is a cross-sectional view showing the adhesive application process using a roll coater, and FIG. 5 is a cross-sectional view showing the bonding process of optical disk single plates. 6 to 17 are views showing other embodiments of the tray for transporting a single optical disk, and FIGS.
16 and 17 are plan views, FIG. 7 is a central sectional view of FIG. 6, FIG. 9 is a central sectional view of FIG. 8, and FIG. 11 is a central sectional view of FIG. 10. 12 to 15 are cross-sectional views. FIG. 18 is a sectional view of a single optical disk to show another embodiment of the hub. 19 to 21 are diagrams for explaining the prior art, in which FIG. 19 is a cross-sectional view of a conventionally proposed closely bonded optical disk, FIG. 20 is a cross-sectional view of a single optical disk, and FIG. FIG. 21 is a sectional view showing an adhesive application process using a roll coater. 1...adhesive layer, 2...optical disc single plate, 3...recording layer or reflective layer, 4...
Hub, 5...Transparent substrate, 6...Signal pattern, 7...Roll coater 8...
Spindle hole! ! ......Tray for transporting a single optical disc 12......Single optical disc mounting surface, 13
...Concave portion, 16...Central axis, 17.
...Magnet, 18...Through hole, 19.
...Connection member. I5! ! Figure 6 Figure 7 Figure 4 Figure 5 Figure I Figure 1O Figure 11 Figure 15 Figure 16 Figure I Figure 12 Figure 13 Figure 14 Figure 17 Figure 18 Figure 19 Figure Q Figure 2I

Claims (1)

[Scope of Claims] (1) A closely bonded optical disk in which two single optical disks are concentrically bonded with the recording layer or reflective layer inside through an adhesive layer, and each optical disk An optical disk in which the recording layer or reflective layer is formed on one side and the hub is attached to the center of the disk, in a method for manufacturing an optical disk in which a hub is attached to the center of the plate, at least a part of which protrudes outward from the light incident surface. A veneer and a tray in the form of a parallel flat plate in which a concave portion into which the hub can be inserted are formed on the optical disc veneer mounting surface, and the optical disc veneer is placed with the recording layer or reflective layer facing upward. Adhesive bonding characterized in that the optical disk is placed on a tray, and a polymer of the single optical disk and the tray is sent to an adhesive roll coater to transfer an adhesive layer onto the recording layer or reflective layer. A method of manufacturing a shaped optical disc. (2) The optical disc veneer mounting surface and the lower surface are parallel and planar, and a recess into which a hub attached to the optical disc veneer can be inserted is formed in the center of the optical disc veneer mounting surface. A tray for transporting a single optical disc. (3) In claim 2, the optical disc is formed into a rectangular shape having four sides slightly longer than the diameter of the single optical disc, and has a diameter that allows the single optical disc to be inserted into the upper surface thereof, An optical disc unit characterized in that a circular optical disc single plate mounting surface shallower than the thickness of the plate is recessed, and a recess into which the hub can be inserted is provided in the center of the optical disc single plate mounting surface. Tray for transporting plates. (4) In claim 2, the outer shape is formed into a rectangle having two sides slightly longer than the diameter of the single optical disc and two sides slightly shorter than the diameter, and the single optical disc can be inserted into the upper surface of the square. a circular arc-shaped optical disk veneer mounting surface having a diameter and shallower than the thickness of the optical disk veneer,
A tray for transporting a single optical disk, characterized in that a recess into which the hub can be inserted is provided in the center of the single optical disk mounting surface. (5) In claim 2, the outer shape is formed into a circle with a diameter slightly larger than the diameter of the optical disc single plate, and has a diameter that allows the optical disc single plate to be inserted into the upper surface thereof, and the optical disc single plate has a thickness of For transporting an optical disk veneer, the optical disk veneer is provided with a recessed circular optical disk veneer mounting surface, and a recess into which the hub can be inserted is provided in the center of the optical disk veneer mounting surface. tray. (6) In claim 2, the outer shape is formed into a circular shape with a diameter equal to or smaller than the diameter of the single optical disc, and a recessed portion into which the hub can be inserted is provided in the center of the circular shape. Tray for transporting single optical discs. (7) In claim 2, in the center of the recessed part,
An optical disk single plate conveying device characterized by having a central shaft protrudingly provided with a diameter that can be inserted into a spindle hole formed in the hub and a length that does not protrude above the upper surface of the tray or the optical disk single plate mounting surface. tray. (8) The tray for transporting a single optical disk according to claim 2, wherein a magnet is embedded in the bottom surface of the recessed portion. (9) In claim 2, in the center of the recessed part,
A central shaft having a diameter that can be inserted into the spindle hole formed in the hub and a length that does not protrude above the top surface of the tray or the single optical disk mounting surface is provided, and a magnet is provided on the bottom surface of the recessed portion. A tray for transporting a single optical disc characterized by being buried. (10) In claim 2, two trays having the optical disk single plate mounting surface and a concave portion are rotatably connected, and at least one pair of positioning means is provided on opposing surfaces of these two trays. A tray for transporting a single optical disc, characterized in that it is formed with: (11) A tray for transporting a single optical disk according to claim 2, characterized in that a through hole penetrating the back surface of the tray is provided in the center of the recessed portion. (12) In claim 2, a plurality of single optical disk mounting surfaces are formed on one tray, and the recessed portion is provided in the center of each of these single optical disk mounting surfaces. Tray for transporting single optical discs.