JPH10188374A - Optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To entirely obviate the intrusion of air bubbles into adhesive layers, to lower the initial error rate of an optical recording medium and to enhance its long-term reliability by applying adhesives on substrates and bonding these substrates to each other in a vacuum atmosphere in the case two sheets of the substrates with the information recording layer parts disposed on inside surfaces are bonded to each other. SOLUTION: In a process for executing UV exposure from above, a dispenser 31 for the adhesives is moved to the prescribed position on the substrate 7 by its horizontal moving unit 32 and the UV curing type adhesives are applied by the dispenser 32 on the substrate 7 rotated by a motor 33. The substrate 7 is set into a vacuum chamber 34. At the point of the time a prescribed vacuum degree is attained, the substrate 9 is opened from a frame 36 supporting the substrate 9 by an electromagnetic switch 37 and is dropped only by its own weight onto the substrate 7. The substrate 7 and substrate 9 adhered by this stage are set in an exposure device for executing UV exposure in the atmosphere where the UV curing type adhesives are exposed from above by using a UV light source 38 and are completely cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium readable and writable using a laser beam and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, an adhesive recording medium having an information recording layer on the bonding surface side of two substrates is coated with an adhesive in the air using a roll coater and a spray method. In general, it has been manufactured by a method of bonding while pressing.

[0003]

FIG. 2 shows a conventional manufacturing method.
6 is shown. 91 and 93 are substrates to be bonded, 92 is an adhesive layer for bonding the substrates, and 90 is a weight for pressing. The optical recording medium manufactured by this method has an adhesive layer 92.
The information recording medium layer portion in contact with the air bubbles is inevitably mixed with the air bubbles and becomes a defective portion of the information recording at the time of recording and reading. Furthermore, the incorporation of air bubbles into the adhesive layer causes cracks in the dielectric layer for protecting the information recording layer, causing burst errors and bit errors.

Further, in the method of bonding while applying pressure in order to increase the dimensional accuracy of bonding, it is extremely difficult in terms of manufacturing technology to uniformly distribute the pressing force over the entire surface of the substrate. In addition to causing birefringence in the layer, dust adhering to the jig is pressed against the substrate surface, causing irregularities on the substrate surface, resulting in deterioration of recording / reproducing characteristics.

[0005] On the other hand, the plastic substrate manufactured by the injection molding method does not have constant dimensions and the like on the outer periphery of the substrate. Therefore, when pressed and bonded, both the surface deviation and the amount of warpage tend to be larger than those of a single plate.

As described above, according to the conventional method of manufacturing a closely bonded optical recording medium, a high-quality closely bonded optical recording medium cannot be produced with a high yield.

The present invention solves the above-mentioned drawbacks of the prior art, and aims at reducing the initial error rate of the optical recording medium, increasing the long-term reliability of the optical recording medium, and manufacturing the optical recording medium. The goal is to increase the yield.

[0008]

According to the present invention, there is provided an optical recording medium and a method of manufacturing the same. (1) Two substrates are bonded together with an information recording layer portion formed on one principal surface of the substrate as an inner surface. A method for manufacturing an optical recording medium having a close-adhering structure, comprising a step of applying an adhesive on the substrate and a step of bonding the substrate in a vacuum atmosphere.

(2) The method for manufacturing an optical recording medium according to claim 1, wherein the bonding is performed by the substrate's own weight or a pressing force of 1 kg / cm ² or less per unit area of the substrate.

(3) The adhesive has a viscosity of 4 to 1000 cp.
3. The method for producing an optical recording medium according to claim 1, wherein the optical recording medium is s.

(4) The degree of vacuum in the vacuum atmosphere is 30 torr.
The method for manufacturing an optical recording medium according to any one of claims 1 to 3, wherein the pressure is from 5 to ^10-3 torr.

(5) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, wherein the adhesive is applied in a ring shape.

(6) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, wherein the adhesive is applied in a dot form.

(7) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, wherein the application of the adhesive is performed by a spin coating method.

(8) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, wherein the application of the adhesive is performed by a roll coating method.

(9) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, wherein the application of the adhesive is performed by a screen printing method.

(10) The method for manufacturing an optical recording medium according to any one of claims 1 to 9, wherein the application of the adhesive is performed in a vacuum atmosphere.

(11) The method for manufacturing an optical recording medium according to any one of claims 1 to 10, wherein the adhesive is applied to a substrate having an optical recording portion.

(12) The adhesive according to claim 1, wherein the adhesive is applied to a substrate on which at least one dielectric film is formed.
11. The method for manufacturing an optical recording medium according to any one of items 10 to 10.

(13) The optical recording medium according to any one of claims 1 to 12, wherein the adhesive is an ultraviolet (UV) curable adhesive, and the method further comprises a step of exposing the adhesive to UV. Production method.

(14) The optical recording medium according to any one of claims 1 to 12, wherein the adhesive is a cyanoacrylate-based, two-part cured epoxy-based, or two-part cured urethane-based adhesive. Production method.

(15) The method for manufacturing an optical recording medium according to any one of claims 1 to 12, wherein the adhesive is of an anaerobic curing type.

(16) The method for manufacturing an optical recording medium according to claim 2, wherein the step of applying a mark load is performed in a vacuum atmosphere.

(17) The method for manufacturing an optical recording medium according to claim 2 or 13, wherein the step of applying a load and the step of performing UV exposure in the atmosphere are performed at least in a time-series manner.

(18) The method according to claim 2 or 13, wherein the step of applying a load, the step of bonding the substrates in a vacuum atmosphere, and the step of performing UV exposure in a vacuum atmosphere are continuous. The manufacturing method of the optical recording medium according to the above.

(19) In the step of applying the adhesive in a ring shape, a patent wherein the W variation of the ring application is 25% or less, D ₂ / D ₁ is 0.6 or more, and α is 5 ° or less. A method for manufacturing an optical recording medium according to any one of claims 1 to 5.

(20) When applying the adhesive, the clearance between the tip of the dispenser nozzle and the substrate on which the adhesive is applied is 0.02 to 5 mm, and the tip of the nozzle is bonded from the beginning to the end of the application. By moving the nozzle or the turntable vertically when finishing the application of the adhesive,
20. The method of manufacturing an optical recording medium according to claim 1, wherein sequence control is performed to separate the tip of the nozzle from the adhesive.

(21) The optical recording medium according to any one of claims 1 to 5, 19, and 20, wherein the turntable is moved in a vertical direction after rotating the turntable a plurality of times from the start of coating. Manufacturing method.

(22) The adhesive according to claim 1, wherein the adhesive applied in the form of a ring comprises a ring having a multiple number of diameters.
The method for producing an optical recording medium according to any one of items 5, 19 to 21.

(23) The adhesive according to any one of claims ₁ to 4, wherein the variation of the diameter d of the adhesive applied in the form of dots is 25% or less, and D ₂ / D ₁ is 0.6 or more. 9. The method for manufacturing an optical recording medium according to claim 1.

(24) When applying the adhesive, the clearance between the tip of the dispenser nozzle and the substrate on which the adhesive is applied is 0.02 to 5 mm, and the tip of the nozzle adheres from the beginning to the end of application. When the nozzle or the turntable is vertically moved when the adhesive is in contact with the adhesive and the application of the adhesive is finished, the tip of the adhesive and the nozzle are separated from each other, and a point at the adhesive is located. The method for manufacturing an optical recording medium according to any one of claims 1 to 4, 6, and 23, wherein the control is performed in a sequence in which the shape application is completed.

(25) The method for manufacturing an optical recording medium according to any one of claims 1 to 4, 6, 23, and 24, wherein the dispenser nozzle has a plurality of nozzles.

(26) The rotation speed of the turntable is set to 5 to 300 RPM and the adhesive is applied, and then the rotation speed is set to 2000 to 4000 RPM and the adhesive is applied to the surface of the substrate. 8. The method for manufacturing an optical recording medium according to any one of items 4 and 7.

(27) The optical recording medium according to any one of claims 1 to 4 and 8, wherein a surface peripheral speed of a coating roller for applying the adhesive is 0.001 to 5 m / sec. Manufacturing method.

(28) The present invention is characterized in that an elastic body is used for the application roller for applying the adhesive.
A method for manufacturing an optical recording medium according to any one of claims 7 to 13.

(29) The first to fourth, eighth, and second claims wherein the elastic material of the application roller for applying the adhesive is made of a material having good wettability with the adhesive and a material having poor wettability with the adhesive.
29. The method for manufacturing an optical recording medium according to any one of items 7 and 28.

(30) The optical recording according to any one of claims 1 to 4, 8, 27, and 28, wherein an elastic body having a pattern of concavities and convexities is formed on a coating roller for applying the adhesive. The method of manufacturing the medium.

(31) The above U which is a radical polymerization reaction type
Claims 1 to 13, 16 using a V-curing adhesive
31. The method for manufacturing an optical recording medium according to any one of Items 30 to 30.

(32) UV irradiation energy is 100 mj /
In cm ² or more, a manufacturing method of an optical recording medium according to any one of Claims first 1～3,16～31 wherein curing the UV curable adhesive.

(33) Claims 1 to 13, 16 to 30, wherein the UV-curable adhesive provided with anaerobic properties is used.
33. The method for manufacturing an optical recording medium according to any one of items 32.

(34) In an optical recording medium having an adhesive recording structure in which two substrates are laminated with an information recording layer portion as an inner surface, the substrate is laminated in an atmosphere of vacuum using an adhesive. An optical recording medium comprising:

(35) The optical recording medium according to claim 34, wherein the adhesive is a UV-curable adhesive of a radical polymerization reaction type, and the photopolymerization initiator contains Irgacure 651 or Irgacure 907.

(36) The optical recording medium according to claim 34 or 35, wherein the bonding stress is 1 kg / cm ² or less per its own weight or per unit area of the substrate.

(37) The viscosity of the adhesive is 4 to 1000 cps
The optical recording medium according to any one of claims 34 to 36, wherein:

(38) The degree of vacuum is 30 torr to 5 × 10 ^−3.
any one of claims 34 to 37 which is torr
The optical recording medium according to item 1.

(39) The light according to any one of (34) to (38), wherein a catalytic function substance for accelerating the curing reaction of the adhesive is disposed on the surface of the substrate with which the adhesive contacts. recoding media.

(40) The substrate having one or a plurality of groups, steps or tapers concentric with the substrate in the periphery of one principal surface of the substrate to be bonded. The optical recording medium according to any one of the above items.

(41) A patent comprising the substrate having one or a plurality of groups, steps or tapers concentric with the substrate, and a substrate having a smooth surface around the principal surface of the substrate to be bonded. The optical recording medium according to any one of claims 34 to 38.

(42) The optical recording medium according to any one of claims 34 to 40, wherein the material of the substrate is plastic or glass.

The features are as follows.

[0051]

According to the above-mentioned structure of the present invention, air bubbles can be completely prevented from entering the adhesive layer, so that an initial error rate in reproduction caused by air bubbles can be improved.

Since it is possible to completely eliminate air bubbles from entering the adhesive layer, it is possible to eliminate the occurrence of cracks in the dielectric layer caused by air bubbles, and to improve the error rate in reproduction using transmitted light and reflected light. Can be.

Since no air bubbles are mixed into the adhesive layer, the refraction and reflection of the laser beam by the air bubbles can be completely eliminated, and the heat conduction to the recording layer can be made uniform, so that a stable information recording bit can be obtained. .

By bonding with low load, it is possible to prevent the occurrence of local birefringence and transfer of dust and unevenness of a processing jig to the surface of the optical recording medium substrate.

By bonding with a low weight, the bonding can be performed without destroying the fragile areas of the dielectric layer and the recording layer around the pinholes generated in the optical recording medium and the information recording layer.

By laminating the two veneers with a low load, the values of surface blur and warpage can be made smaller than those of the veneers.

By providing a groove in the substrate of the optical recording medium, the adhesive does not protrude to the inner or outer peripheral portion of the bonded optical recording medium, and the step of wiping the protruding adhesive is not required. , The production yield can be increased.

[0058]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1 FIG. 1 shows a main part of a cross section of an optical recording medium having a dielectric on the bonding surfaces of two substrates. The polycarbonate substrate 1 has a thickness of 1.2 mm, and a groove having a pitch of 1.6 μm, a width of 0.8 μm, and a depth of 650 ° is formed on one principal surface thereof. The dielectric layers 2 and 4 are a silicon nitride film having a thickness of 1000 °, and the magneto-optical recording layer 3 is a Tb-Fe film having a thickness of 800 °.
-Co alloy layer. The substrate 7 includes a polycarbonate substrate 1, a silicon nitride film 2, a magneto-optical recording layer 3, and a silicon nitride film 4. The polycarbonate substrate 6 has a thickness of 1.2 mm, and a silicon nitride film 7 having a thickness of 1000 ° is formed on one principal surface thereof. The substrate 9 indicates a substrate composed of the polycarbonate substrate 6 and the silicon nitride film 7. The substrate 9 is closely adhered to the substrate 7 via the UV-curable adhesive layer 5.

Next, a method for manufacturing the optical recording medium will be described.

FIGS. 4A to 4C show main steps of a process for performing UV exposure from above. FIG. 4 (a) shows a schematic diagram and method of an adhesive dispensing device. The dispenser 31 is moved to a predetermined position on the substrate 7 by the dispenser horizontal moving unit 32, and a UV curable adhesive is applied to the substrate 7 rotated by the motor 33 using the dispenser 31. FIG. 4 (b) shows a schematic diagram and method of an apparatus for bonding two substrates in a vacuum. 34 is a vacuum chamber, 35 is a vacuum pump, 36 is a frame supporting the substrate 9, and 37 is an electromagnetic switch for releasing the substrate 9 from the frame 36 and dropping it on the substrate 7.
The substrate 7 coated with the UV curable adhesive is set in the vacuum chamber 34, and the degree of vacuum in the vacuum chamber is 1 × 1.
^{When the} pressure reaches ^-1 torr, the substrate 9 is released from the frame 36 supporting the substrate 9 by the electromagnetic switch 37, and the substrate 9 is dropped onto the substrate 7 by its own weight. FIG. 4 (c)
Shows a schematic diagram and method of an apparatus for UV exposure. The substrates 7 and 9 bonded in the above steps are set in an exposure apparatus that exposes UV light in the atmosphere, and are exposed from above using a UV light source 38 to completely cure the UV-curable adhesive.

A 2KW high-pressure mercury lamp manufactured by Barkey Technical Co. was used as the UV light source 38.

The optical recording medium having the structure shown in FIG. 1 manufactured by the above method has no air bubbles in the adhesive layer 5 and its interface, and further has a dielectric material around the pinhole part in the recording layer part. No destruction of the body layer and the recording layer occurred. The bit error rate reached 4 × 10 ⁻⁶ times / bit, with no burst errors due to air bubble incorporation. The amount of surface shake was 70 μm for the substrate alone, but was 35 μm after lamination, which was greatly improved.

Embodiment 2 FIG. 5 shows a method of exposing the optical recording medium shown in FIG. 1 to UV exposure from below. The adhesive is applied to the substrate 9 in the air as shown in FIG. 4A, and then the substrate 9 and the substrate 7 are bonded in a vacuum as shown in FIG. 4B, and finally shown in FIG. As described above, the UV-curable adhesive is completely cured by UV exposure from below in the atmosphere.

The optical recording medium shown in FIG. 1 manufactured by the above method has no bubbles in the adhesive layer 5 and the interface between the adhesive layer 5 and the pin in the recording layer portion. No destruction of the dielectric layer and the recording layer around the hole portion occurred. Therefore, there is no burst error due to air bubbles, and the bit error rate is 3 × 10 ⁻⁶ times / bit.
It became. Further, the surface blur amount was 80 μm for the substrate alone, but was 30 μm after bonding, which was greatly improved.
Further, by applying the adhesive to the substrate 9 having no recording layer portion, it was possible to minimize the penetration of the adhesive from the pinhole into the recording layer.

Embodiment 3 FIG. 2 shows a main part of a cross section of an optical recording medium having no dielectric layer on the bonding surface of one polycarbonate substrate.
The polycarbonate substrate 16 has a thickness of 1.2 mm, and no dielectric layer is formed on the surface thereof. The polycarbonate substrate 11 has a plate thickness of 1.2 mm, and a groove having a pitch of 1.8 μm, a width of 0.6 μm, and a depth of 670 ° is formed on one principal surface thereof. Reference numerals 12 and 14 denote 800-nm thick silicon-aluminum nitride composite dielectric layers, and 13 denotes a 800-nm-thick N
This is a magneto-optical recording layer made of a d-Dy-Fe-Co-Ti alloy layer. The substrate 17 is composed of a polycarbonate substrate 11, silicon-aluminum nitride composite dielectric layers 12, 14, and a magneto-optical recording layer 13. This optical recording medium is adhered and adhered by almost the same manufacturing method as in the first embodiment. The substrate 16 is closely adhered to the substrate 17 via the UV curing adhesive layer 5.

The optical recording medium manufactured by the above method has a bit error rate of 4 × 10 ⁻⁶ times / bit and a surface blur amount of 40 μm.

Embodiment 4 FIG. 6 shows a schematic view and a method of a manufacturing apparatus for bonding optical recording media while pressing them. Adhesive application process and adhesive U
The V curing step is almost the same as in the first embodiment. The substrate 7 coated with the UV-curable adhesive is set in the vacuum chamber 34, and when the degree of vacuum in the vacuum chamber reaches 2 × 10 ⁻² torr, the substrate 9 is pressed while being pressed by the air cylinder 40. It is attached to the substrate 7. Reference numeral 41 denotes a pressure plate having a smooth surface, and reference numeral 42 denotes a holding unit that holds the substrate 9. This holding unit is a mechanism that releases the substrate 9 when fitted to the center boss 43, and drops the substrate 9 onto the substrate 7 by its own weight.

The optical recording medium manufactured by the above method has no air bubbles in the adhesive layer 5 and its interface, and further has a dielectric layer around the pinhole portion in the recording layer portion.
No destruction of the recording layer occurred. The bit error rate is such that there is no burst error due to air bubbles,
4 × 10 ⁻⁶ times / bit was reached. The amount of surface shake was 70 μm for the substrate alone, but was 35 μm after lamination, which was greatly improved.

Embodiment 5 FIGS. 7 and 8 are schematic views of an apparatus for performing UV exposure while applying pressure, which is an improvement of FIG. 4C described in Embodiment 1. FIG.
In FIG. 8, reference numeral 44 denotes quartz glass; in FIG. 8, reference numeral 45 denotes a pressurizing cylinder; 46, a lamp unit which moves up and down in conjunction with the pressurizing cylinder 45; The other bonding steps were the same as in Example 1 except that pressure was applied during exposure, and an optical recording medium shown in FIG. 1 was produced. Pressing is preferably performed under a low load, and the test results are shown in Table 2. Almost the same yield was obtained with the apparatuses of FIGS. 7 and 8.

Example 6 FIG. 9 shows that an adhesive was applied on a substrate in the air, and then the two substrates were pressure-bonded together in a vacuum, and the pressure was applied to the substrate.
1 shows a schematic diagram and method of an apparatus for performing exposure and manufacturing an optical recording medium. 9, 54 is a vacuum pump, 55 is a vacuum chamber, 48 is a pressure cylinder, 49 is a pressure plate having a smooth surface, 50 is a holding unit for the substrate 7, 51 is a center boss for positioning, 52 is quartz glass, 53 is a UV lamp. Using this apparatus, an optical recording medium having the structure shown in FIG. 1 was produced. Pressing with a lower load resulted in a higher yield. The test results are as shown in Table 2 with almost the same yield as in Example 5.

Embodiment 7 FIG. 10 is a schematic view of an optical recording medium manufacturing apparatus used in this embodiment, wherein 62 is a vacuum chamber, 63 is a vacuum pump, 56
Is a motor, 57 is a dispenser nozzle for applying adhesive, 5
Reference numeral 8 denotes a dispenser unit, 59 denotes a dispenser horizontal moving unit, and 60 denotes an electromagnetic switch for dropping the substrate 9 on the substrate 7 provided with a recording layer on one side. 6
Reference numeral 1 denotes a support frame for the substrate 9, and 64 denotes an operation unit of the electromagnetic switch. Using this apparatus, a dispenser nozzle 57 for applying an adhesive is placed on the substrate 7 in a vacuum of 1 × 10 ^−I torr.
After applying a UV-curing adhesive by using, the substrate 9 is dropped on the substrate 7 by its own weight, and the substrates are bonded to each other.
Complete curing in air using a UV exposure machine shown in Fig. 1
Was manufactured. The optical recording medium manufactured by this method is free from bubbles in the adhesive layer and into the adhesive interface and free from pinhole destruction in the recording layer.
× 10 ⁻⁶ times / bit was obtained. In particular, the burst error caused by air bubbles was completely eliminated. Furthermore, 7
The surface blur amount of the substrate of the optical recording medium which was 0 μm was 35 μm after bonding. Also, the amount of warpage of the substrate was significantly reduced.

Embodiment 8 FIG. 11 shows an example of an optical recording medium bonding apparatus. The gate valve 65 is opened, the dispenser 57 'is inserted into the vacuum chamber 62', and the adhesive is applied to the substrate 27 in the atmosphere. After the dispenser 57 is moved out of the vacuum chamber 62 ′ and the gate valve 65 is closed, the vacuum chamber 62 ′ is evacuated and the substrates are bonded when the degree of vacuum reaches 5 × 10 ⁻² torr. Thereafter, the adhesive was completely cured using a UV exposure machine shown in FIG. In FIG. 11, reference numeral 60 'denotes an electromagnetic switch, 61 denotes a support frame of the substrate 27, 58' denotes a dispense unit, 63 'denotes a vacuum pump, and 64' denotes an operation unit of the electromagnetic switch 60 '.
The manufactured optical recording medium has the structure shown in FIG. 3. The polycarbonate substrate 21 has a thickness of 1.2 μm, and a groove having a pitch of 1.6 μm, a width of 0.6 μm, and a depth of 700 ° is formed on one surface thereof. The dielectric layers 22 and 24 are a composite layer of silicon nitride and aluminum nitride and have a thickness of 800 Å, and the magneto-optical recording layer 23 has a thickness of 450 で made of a Tb-Fe-Co alloy. The substrate 27 is made of the polycarbonate substrate 21, the dielectric layer 2
2 and 24 and the magneto-optical recording layer 23.
The two substrates 27 are closely adhered to each other via a UV adhesive 25. The optical recording medium manufactured by this method has no bite rate in the adhesive layer and in the adhesive interface, and no damage to the dielectric layer and the recording layer around the pinhole in the recording layer portion, and has a bit error rate of 2 × 10 ^−6. Times / bit was obtained. In particular, the burst error caused by air bubbles was completely eliminated. Further, the surface deviation of the substrate of the optical recording medium, which was 60 μm for the substrate alone, became 25 μm after bonding. Further, the amount of warpage of the substrate was significantly reduced.

Embodiment 9 A dispense method using the dispense device shown in FIG. 4 will be described below. The point is how to uniformly apply the adhesive 5 on the substrate 7. FIG. 12A shows a state in which the substrate 7 is held on a turntable 68 and the adhesive 5 is applied in a ring shape by the dispenser 31. As shown in FIG. 12 (b), the applied adhesive has an α of 5 ° or less, a W variation of 25% or less, and a D ₂ / D ₁ of 0.6 in an applied state in which the application start A and the application end B are separated. If the shapes of A and B are not substantially equal, the adhesive may protrude to the outer periphery during vacuum bonding, pass through the inner stamper holding groove 66, and reach the turntable center boss. It was inevitable. When the optical recording medium is continuously bonded, the protrusion of the adhesive contaminates the surface of the recording medium with the adhesive, contaminates the handling device, contaminates the vacuum chamber, and gives optical distortion to the optical recording medium. Was the cause. The dispense method shown in FIGS. 13 (a) to 13 (e) solves all the above problems, and FIG.
This is a method for giving an ideal coating state shown in FIG. FIG.
(A) shows the dispenser which has moved horizontally to the predetermined application position (D2). FIG. 13B shows the start of the application of the adhesive in a range where the tip of the nozzle does not contact the substrate 7 (δ is 0.02 mm to 5 mm and the nozzle tip is lowered in the vertical direction).
It is preferable that the turntable has already been rotated at the start of coating. FIG. 13C shows a state in which the adhesive is being applied in a ring shape. FIG. 13D shows a state in which the application of the adhesive has been completed and the dispenser nozzle has moved in the vertical direction. It is preferable that the turntable be rotated when moving in the vertical direction. FIG. 13E shows a state where the dispenser nozzle has moved in the horizontal direction. In the state of FIG. 13C, in order to increase the uniformity of the adhesive application, the turntable is rotated a plurality of times after the application of the adhesive from the dispenser nozzle is completed.
The process may move to the step (d).

Through the steps shown in FIGS. 13A to 13E,
It became possible to apply the ideal adhesive shown in FIG. W
The range of fluctuation is 10 when the adhesive viscosity is in the range of 2 to 1000 cps.
%. With respect to the adhesive of 4 to 1000 cps, vacuum bonding was thereafter performed 100 times for each sample to obtain an optical recording medium shown in FIG. There was no protrusion of the adhesive.

As shown in FIG. 15, the adhesive did not protrude even when the adhesive showing a plurality of rings was applied.

FIG. 16A shows a method for realizing ideal coating by dot coating. The dispense nozzle 31 can be moved in the horizontal and vertical directions as in FIGS. 13 (a) to 13 (e). The dispensing sequence is dispenser nozzle D
2 and stop, and thereafter, every time the turntable stops at the positions (a) to (h) shown in FIG. 16 (b), the dispenser nozzle descends to the position δ, and the adhesive is dispensed. The dispensing nozzle is raised after the application is completed. This step was repeated a plurality of times to obtain the application state shown in FIG. FIG. 16 shows a dot-shaped application portion on the substrate 7.
In (b), the number is eight, but as the number of application points increases, the bonding becomes better. The fluctuation range of the diameter d of the dot-like coating was 10% or less at all points (the viscosity of the adhesive was 2 to 10).
00cps range). With respect to the adhesive of 4 to 1000 cps, vacuum bonding was then performed 100 times for each sample to obtain an optical recording medium shown in FIG. 23, but the adhesive did not protrude to the inner and outer surfaces. FIG. 17 (a) shows a plurality of point-like application of adhesive using the dispensers nozzle _{(68a~68h) (68a 0 ~68h 0} ) status.
There are a plurality of dispenser nozzles 68, and it is possible to apply the state shown in FIG. FIG.
The point application was performed by the method of FIG. 7A, and the lamination was performed in a vacuum. As in the result shown in FIG.
There was no protrusion of the adhesive.

In this embodiment, the group 66 shown in FIG. 23 as the final shape of the optical recording medium may have a step 87 and a taper 88 shown in FIGS. 24 and 25 on the inner periphery of the substrate. The substrate used in the structure shown in FIGS. 23 to 25 is not limited to polycarbonate, but may be PMMA, epoxy, or TP.
X, glass substrates can be used.

Embodiment 10 FIG. 18A shows an embodiment in which a spin coater is used in an apparatus for applying an adhesive. 70 is a turntable, and 71 is a dispense nozzle. When applying the adhesive, the substrate 7 is rotated at a low speed (5 to 300 RPM), and then the adhesive is uniformly applied to the surface of the substrate 7 at a high speed (2000 to 4000 RPM) as shown in FIG. 30 μm
After that, vacuum bonding was performed using the apparatus shown in FIGS. 4B and 4C, and UV exposure was performed.

The adhesive shown in Table 4 has a viscosity of 50.
The one of cps was used. As a result, although some adhesive was protruded on the outer periphery, there was no problem in practical use.

Embodiment 11 FIGS. 19, 20 and 21 show an embodiment in which a roller is used in a device for applying an adhesive. In FIG. 19, 69 is an adhesive tank, 75 is an adhesive (see Table 4), 76 is a rubber roller made of fluoro rubber, 72 is a coating roller made of fluoro rubber, 73 is a belt for transporting the substrate 7, and 74 is a plate for adjusting the amount of coating. is there.
The diameter of the application roller is 80 mm, and the adhesive is evenly applied on the substrate 7 by rotating at 60 RPM to make the thickness of the adhesive 30 μm. Then, vacuum bonding is performed by the apparatus shown in FIGS. 4B and 4C. , UV exposure. As a result, the adhesive protruded on the outer periphery and the inner periphery, which was not practical. FIG.
Although the configuration is similar to that of No. 9, the application roller 77 is characterized in that it has two types of surfaces, fluorine rubber and silicon rubber. 77
There are a donut-shaped fluoro rubber surface which is smaller than the outer periphery of the substrate 7 and larger than the inner periphery thereof, and a silicon rubber surface in other portions. The fluoro rubber surface of the application roller 77 has a property that the adhesive (see Table 4) wets the surface well.
Since the silicon rubber surface has very poor wettability, the adhesive is adhered only to the donut-shaped fluororubber surface, and the adhered adhesive was applied on the substrate 7 as shown in FIG. Adhesive thickness is 30μm, peripheral speed of 77 roll surface is 0.01m
/ sec. The 78 conveyor belt has 79 substrate positioning bosses, which synchronize with the rotation of the rollers 77 so that the position of the substrate does not shift. After applying the adhesive,
Fig. 4 (b) Vacuum bonding with the device shown in Fig. 4 (c), U
V exposure was performed. As a result, the adhesive did not protrude on the outer periphery and the inner periphery, and good results were obtained.

FIG. 21 shows that the substrate 7
Are formed smaller than the outer periphery and larger than the inner periphery. The material 80 is a fluororubber whose adhesive (see Table 4) is well wetted on the surface. The adhesive was applied on the donut pattern of the application roller 80 on the substrate 7 at an adhesive thickness of 30 μm and a peripheral speed of 78 rollers of 0.03 m / sec.
After the application of the adhesive, the substrates were vacuum-bonded using the apparatus shown in FIGS. 4B and 4C, and UV exposure was performed. As a result, the adhesive did not protrude on the outer periphery and the inner periphery, and good results were obtained.

The surface speed of the application roller is 0.001 to 5 m
/ sec is good. If the speed is 5 m / sec or more, the amount of air bubbles mixed into the adhesive becomes too large, resulting in an unpleasant taste. 0000
If the viscosity is less than 1 m / sec, stable adhesion to the roller cannot be obtained when the adhesive has a low viscosity. The adhesive used may have a viscosity of 0.5 to 10000 cps, but preferably has a viscosity of 4 to 1000 cps due to the inclusion of bubbles and adhesion of the adhesive to an unstable roller. Embodiment 12 FIGS. 22 (a) and 22 (b) show an embodiment in which screen printing is used for an adhesive application device. FIG. 22 (a)
86 is a polyurethane squeegee, 81 is an adhesive (Table 4)
Reference numeral 82 denotes a screen plate, reference numeral 83 denotes a donut-shaped pattern portion, reference numeral 84 denotes a substrate fixing base, and reference numeral 84 denotes a substrate fixed by a center boss of the fixing base 84. FIG. 22 (b)
Shows a state in which the substrate 7 to which the adhesive 81 is applied is taken out by rotating the hinge 85. The screen plate used had a pattern ratio of a penetrating portion to a non-penetrating portion of 3 to 7 on the pattern. The substrate 7 to which the adhesive was applied was vacuum-bonded by using the apparatus shown in FIGS. 4B and 4C and subjected to UV exposure to obtain an optical recording medium. As a result, the adhesive did not protrude from the outer periphery and the inner periphery. In the case of screen printing, the adhesive viscosity used is
It is preferably from 0.5 to 70000 cps. Also, 500
For those with cps or more, it is necessary to improve the deaeration by mixing a silicone-based antifoaming agent into the adhesive. The screen plate needs to be smaller than 3 to 7 for an adhesive having a ratio of a penetrating portion to a non-penetrating portion on the pattern of 20 cps or less.

The above is only a part of the present invention, and the appropriate ranges of the respective factors in the present invention are as follows.

Bonding weight: In the present invention, bonding and pressing or bonding can be performed within the range of the substrate's own weight of 10 kg / cm ² , but the range of the substrate's own weight of 1 kg / cm 2 can be applied to the outer and inner circumferences. This is the most suitable because the adhesive does not protrude and the dielectric layer and the recording layer around the pinhole in the optical recording layer are not broken.

Adhesive viscosity: The adhesive viscosity is 0.5
It is possible to paste in the range of ~ 10000cps,
Above 1000 cps, the diffusion and defoaming properties of the adhesive during bonding are slightly inferior, and below 4 cps, the error rate deteriorates due to the penetration of the adhesive into the recording layer pinholes. Is most preferred.

Degree of vacuum: bonding is 100 torr to 1 ×
It is possible in the range of 10 ^-4 torr. However, a high probability of inclusion of air bubbles in the above 30 torr, since below 5 × ^{10 -3} torr is adhesive to bumping, 30torr~5 × ^{10 -3} to
The range of rr is suitable. However, the structure of the optical recording medium shown in FIGS. 1 and 2 in which the dielectric is coated on the bonding surface of the plastic substrate and the surface of the plastic is not exposed, and the plastic is exposed without the dielectric coating on the bonding surface of the plastic substrate. In the structure of the optical recording medium shown in FIG. 2, the latter emits more gas from the plastic substrate, makes the wettability between the plastic surface and the adhesive non-uniform, and easily introduces bubbles. Therefore, the proper degree of vacuum at the time of bonding differs between the former and the latter structures, and the proper degree of vacuum of the latter is higher than that of the former and is 10 torr to 5 × 10 ⁻³ torr.

The difference in burst error between the optical recording media produced in the case of applying an adhesive in a vacuum and performing vacuum bonding and the optical recording medium manufactured in the case of applying in air and bonding in a vacuum is attributed to air bubble mixing. The adhesive did not protrude to the inner and outer circumferences of the optical recording medium, and the quality was the same as the dimensional accuracy of the bonded optical recording medium such as a surface press.

Adhesive coating method: The adhesive can be applied to the substrate by any of a dispenser method, a spin coating method, a roll coating method, and a screen printing method. However, in order to reduce the probability of air bubbles being mixed in the adhesive and at the bonding interface, ring-shaped coating and dot-shaped coating by the dispenser method are the most superior, and the highest production yield can be obtained.

Atmosphere at the time of dispense: The atmosphere at the time of dispense of the adhesive can be either air or vacuum, and an optical recording medium having almost the same bit error rate can be obtained in both. However, from the viewpoint of the stability of the dispensing operation and the maintenance of the apparatus, the atmosphere at the time of the dispense is more suitable for the atmosphere.

Adhesive: The adhesive is not limited to the UV-curable adhesive, but may be an anaerobic-curable adhesive, a cyanoacrylate-based adhesive, a two-part curable epoxy-based adhesive, or a two-part curable urethane-based adhesive. Etc. can be used. An anaerobic adhesive or an adhesive using an anaerobic UV adhesive can dispose of an optical recording medium having substantially the same bit error rate in both air and vacuum. However, from the viewpoint of the stability of the dispensing operation and the maintenance of the apparatus, the atmosphere at the time of the dispense is more suitable for the atmosphere.

Adhesive: The adhesive is not limited to a UV-curable adhesive, but may be an anaerobic-curable adhesive, a cyanoacrylate-based adhesive, a two-part curable epoxy-based adhesive, or a two-part curable urethane-based adhesive. Etc. can be used. When using an anaerobic adhesive or an anaerobic-imparting UV adhesive, it is desirable to apply a catalytic substance that promotes anaerobic curing to the surface of the substrate in contact with the adhesive in the form of dots or layers. As the catalyst material, metals such as Fe, Cu, Zn, and A1 or alloys containing them in one part can be used.

Since the adhesive is cured by heat, moisture, ultraviolet light, an anaerobic atmosphere or a combination thereof, the curing method of the adhesive is included in the present invention.

Irradiation energy for UV exposure: The UV curable adhesive has an irradiation energy for UV exposure of 100 mj / cm ^2.
As described above, the polymerization is rapidly caused, and the physical properties of the cured adhesive required for the optical recording medium can be obtained. On the other hand, 10
If it is 0 mj / cm ² or less, the polymerization reaction is unstable, and the physical property value of the cured adhesive becomes large, making it a little difficult to obtain good physical property values.

In the present invention, the material of the substrate is not limited to polycarbonate, and any material having excellent optical properties, such as PMMA, epoxy, TPX, and glass, can be used.

[0096]

The following effects are obtained by using the manufacturing method and the medium structure of the present invention.

Thus, the mixing of air bubbles into the adhesive layer was completely eliminated, and the initial error rate in the case of transmitted light reproduction was improved.

It was possible to eliminate air bubbles from entering the adhesive, and to significantly improve the error rate in the case of reproducing transmitted light and reflected light.

The occurrence of cracks in the dielectric layer caused by bubbles in the adhesive layer could be eliminated, and the error rate in the case of reproducing transmitted light and reflected light could be remarkably improved.

The thermal diffusion of the laser beam generated by the bubbles in the adhesive layer could be completely eliminated, and a stable bit could be formed.

By bonding with a low pressure load,
It was possible to prevent the occurrence of local birefringence and the transfer of dust, dust, and unevenness of the pressing jig to the substrate surface by the conventional pressing jig.

By bonding with a low pressure load,
It was possible to bond the optical recording medium without destroying the pinhole generated in the recording part. (If the pinhole is destroyed, that portion becomes a burst error and lowers the bit error rate.) The value of the optical recording medium bonded is about 5 more than the value of the surface deflection and warpage of the bonded substrates alone.
It's about a percentage better.

The adhesive did not protrude into the inner and outer peripheral portions of the bonded optical recording medium, and a highly reliable optical recording medium with a high yield was obtained.

[0104]

[Table 1]

[0105]

[Table 2]

[0106]

[Table 3]

[0107]

[Table 4]

[0108]

[Table 5]

[Brief description of the drawings]

FIG. 1 is a main sectional view showing one embodiment of an optical recording medium of the present invention.

FIG. 2 is a main sectional view showing one embodiment of the optical recording medium of the present invention.

FIG. 3 is a main sectional view showing one embodiment of the optical recording medium of the present invention.

4 (a) to 4 (c) are dispense devices of the present invention,
FIG. 2 is a conceptual diagram of a vacuum bonding apparatus and a UV exposure apparatus.

FIG. 5 is a conceptual diagram of an apparatus for performing UV exposure from below according to the present invention.

FIG. 6 is a conceptual diagram of a vacuum bonding apparatus of the present invention.

FIG. 7 is a conceptual diagram of an apparatus for performing UV exposure while applying pressure according to the present invention.

FIG. 8 is a conceptual diagram of an apparatus for performing UV exposure while applying pressure according to the present invention.

FIG. 9 is a conceptual diagram of an apparatus for performing a vacuum bonding step and a UV exposure step in one apparatus according to the present invention.

FIG. 10 is a conceptual diagram of an apparatus for performing a dispense step, a vacuum bonding step, and a UV exposure step in one apparatus according to the present invention.

FIG. 11 is a conceptual diagram of an apparatus for performing a dispense step, a vacuum bonding step, and a UV exposure step in one apparatus according to the present invention.

12A is a cross-sectional view of a substrate of the present invention in which an adhesive is dispensed in a ring shape, and FIG. 12B is a plan view of a substrate of the present invention in which an adhesive is dispensed in a ring shape.

FIGS. 13A to 13E are views showing a step of dispensing an adhesive in a ring shape according to the present invention.

FIG. 14 is a plan view of a substrate in which an adhesive is dispensed in a single ring shape according to the present invention.

FIG. 15 is a plan view of a substrate dispensed in a multiple ring shape according to the present invention.

16A is a cross-sectional view of a substrate and a center boss showing a procedure of dispensing an adhesive in a dot shape according to the present invention, and FIG.
1 is a plan view of a substrate in which an adhesive is dispensed in a dot form according to the present invention.

17A is a cross-sectional view of a substrate and a center boss showing a procedure of dispensing an adhesive in a dotted manner on multiple concentric circles of the present invention, and FIG. 17B is a cross-sectional view of multiple concentric circles of the present invention. FIG. 2 is a plan view of a substrate in which an adhesive is dispensed in a dot shape.

18A is a conceptual diagram showing a procedure of applying an adhesive by a spin coater method, and FIG. 18B is a cross-sectional view of a substrate and an center boss in which an adhesive is applied to the substrate by a spin coat method.

FIG. 19 is a schematic view of an apparatus for applying an adhesive to a substrate by a roll coater method.

FIG. 20 is a schematic view of an apparatus for applying an adhesive to a substrate by a roll coater method.

FIG. 21 is a schematic view of an apparatus for applying an adhesive to a substrate by a roll coater method.

FIGS. 22A and 22B are a schematic view and a diagram showing an apparatus for applying an adhesive to a substrate by a screen printing method.

FIG. 23 is a cross-sectional view of various optical recording media manufactured by using the manufacturing method of the present invention.

FIG. 24 is a cross-sectional view of various optical recording media manufactured using the manufacturing method of the present invention.

FIG. 25 is a cross-sectional view of various optical recording media manufactured by using the manufacturing method of the present invention.

FIG. 26 is a schematic view of a conventional substrate bonding method.

FIG. 27 is a view showing the shape of an injection-molded plastic substrate.

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[Procedure amendment]

[Submission date] December 4, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Optical recording medium

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

The optical recording medium of the present invention comprises: (1) an optical recording medium formed by laminating two substrates.
The information recording layer is formed on the inner surface of at least one of the substrates.
Formed at least one dielectric on the information recording layer.
A film is formed, via the adhesive layer on the dielectric film, the other
An optical recording medium adhered to a substrate .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

(2) The dielectric film is made of silicon nitride.
The optical recording medium according to claim 1 .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

(3) The adhesive is of a radical polymerization reaction type.
A certain UV-curable adhesive uses a photopolymerization initiator
Claims containing wore 651 or irgacure 907
Item 3. The optical recording medium according to Item 1 or 2 .

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

(4) The surface of the substrate contacted with the adhesive is
A catalytic functional substance that promotes the curing reaction of the adhesive is placed
The optical recording medium according to claim 1 .

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

(5) Around one principal surface of the substrate to be bonded
One or more glues concentric with the substrate
2. The substrate according to claim 1, wherein the substrate has a step, a step or a taper.
5. The optical recording medium according to any one of items 1 to 4 .

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

(6) Around one main surface of the substrate to be bonded
One or more glues concentric with the substrate
Having a smooth surface with the substrate having a step, a step or a taper
6. The optical recording medium according to claim 1, comprising the substrate .

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

(7) The material of the substrate is plastic or
The optical recording medium according to claim 1, which is glass .

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[Correction contents]

Since no bubbles are mixed into the adhesive layer, the refraction and reflection of the laser beam by the bubbles can be completely eliminated, and the heat conduction to the recording layer can be made uniform, so that a stable information recording bit can be formed .

[Procedure amendment 46]

[Document name to be amended] Statement

[Correction target item name] 0081

[Correction method] Change

[Correction contents]

Embodiment 11 FIGS. 19, 20 and 21 show an embodiment in which a roller is used in a device for applying an adhesive. 69 the adhesive tank 19, 75 is an adhesive (see Table 4), 76 fluororubber rubber roller 72 fluororubber coating roller, the substrate 7 carrying belt 73, the blade coating amount adjusting 74 It is.
The diameter of the application roller is 80 mm, and the adhesive is evenly applied on the substrate 7 by rotating at 60 RPM to make the thickness of the adhesive 30 μm. Then, vacuum bonding is performed by the apparatus shown in FIGS. 4B and 4C. , UV exposure. As a result, the adhesive protruded on the outer periphery and the inner periphery, which was not practical. FIG.
Although the configuration is similar to that of FIG. 19, the application roller 77 has a feature that it has two types of surfaces of fluorine rubber and silicon rubber.
The surface of the substrate 77 has a donut-shaped fluororubber surface which is smaller than the outer periphery of the substrate 7 and larger than the inner periphery thereof, and a silicon rubber surface in other portions. The adhesive (see Table 4) has a property that the adhesive (see Table 4) wets the surface of the fluoro rubber of the application roller 77, and the adhesive adheres only to the donut-shaped fluoro rubber surface because the silicon rubber surface has very poor wettability. The adhesive was applied onto the substrate 7 as shown in FIG. Adhesive thickness is 30μm, peripheral speed of 77 roll surface is 0.01
m / sec. The 78 conveyor belt has 79 substrate positioning bosses, which synchronize with the rotation of the rollers 77 so that the position of the substrate does not shift. After the application of the adhesive, the substrates were vacuum-bonded using the apparatus shown in FIGS. 4B and 4C, and UV exposure was performed. As a result, the adhesive did not protrude on the outer periphery and the inner periphery, and good results were obtained.

[Procedure amendment 47]

[Document name to be amended] Statement

[Correction target item name] 0083

[Correction method] Change

[Correction contents]

The surface speed of the application roller is 0.001 to 5 m
/ sec is good. If the speed is 5 m / sec or more, the amount of air bubbles mixed into the adhesive becomes too large and tends to be too high. 0000
If the viscosity is less than 1 m / sec, stable adhesion to the roller cannot be obtained when the adhesive has a low viscosity. The adhesive used may have a viscosity of 0.5 to 10000 cps, but preferably has a viscosity of 4 to 1000 cps due to the inclusion of bubbles and adhesion of the adhesive to an unstable roller. Embodiment 12 FIGS. 22 (a) and 22 (b) show an embodiment in which screen printing is used for an adhesive application device. FIG. 22 (a)
86 is a polyurethane squeegee, 81 is an adhesive (Table 4)
Reference numeral 82 denotes a screen plate, reference numeral 83 denotes a donut-shaped pattern portion, reference numeral 84 denotes a substrate fixing base, and reference numeral 84 denotes a substrate fixed by a center boss of the fixing base 84. FIG. 22 (b)
Shows a state in which the substrate 7 to which the adhesive 81 is applied is taken out by rotating the hinge 85. The screen plate used had a pattern ratio of a penetrating portion to a non-penetrating portion of 3 to 7 on the pattern. The substrate 7 to which the adhesive was applied was vacuum-bonded by using the apparatus shown in FIGS. 4B and 4C and subjected to UV exposure to obtain an optical recording medium. As a result, the adhesive did not protrude from the outer periphery and the inner periphery. In the case of screen printing, the adhesive viscosity used is
It is preferably from 0.5 to 70000 cps. Also, 500
For those with cps or more, it is necessary to improve the deaeration by mixing a silicone-based antifoaming agent into the adhesive. The screen plate needs to be smaller than 3 to 7 for an adhesive having a ratio of a penetrating portion to a non-penetrating portion on the pattern of 20 cps or less.

[Procedure amendment 48]

[Document name to be amended] Statement

[Correction target item name] 0090

[Correction method] Change

[Correction contents]

[0090] Deisupensu at the time of the atmosphere: the atmosphere at the time of Deisupensu the adhesive is, Oh possible in both the atmosphere and the vacuum
Thus , an optical recording medium having substantially the same bit error rate can be obtained in both cases. However, from the viewpoint of the stability of the dispensing operation and the maintenance of the apparatus, the atmosphere at the time of the dispense is more suitable for the atmosphere.

[Procedure amendment 49]

[Document name to be amended] Statement

[Correction target item name] 0097

[Correction method] Deleted

Claims (42)

[Claims] 1. A method for manufacturing an optical recording medium having a contact bonding structure in which two substrates are bonded with an information recording layer portion formed on one principal surface of the substrate as an inner surface. A method for manufacturing an optical recording medium, comprising: a step of applying an agent and a step of bonding the substrate in a vacuum atmosphere. 2. The method for manufacturing an optical recording medium according to claim 1, wherein the bonding is performed by the substrate's own weight or a pressing force of 1 kg / cm ² or less per unit area of the substrate. 3. The method for manufacturing an optical recording medium according to claim 1, wherein said adhesive has a viscosity of 4 to 1000 cps. 4. The vacuum atmosphere has a degree of vacuum of 30 torr to 5 ×.
The method for producing an optical recording medium according to any one of claims 1 to 3, wherein the optical recording medium has a pressure of 10 ^-3 torr. 5. The method for manufacturing an optical recording medium according to claim 1, wherein said adhesive is applied in a ring shape. 6. The method for manufacturing an optical recording medium according to claim 1, wherein said adhesive is applied in a dot-like manner. 7. The method of manufacturing an optical recording medium according to claim 1, wherein the application of the adhesive is performed by a spin coating method. 8. The method for manufacturing an optical recording medium according to claim 1, wherein the application of the adhesive is performed by a roll coating method. 9. The method for manufacturing an optical recording medium according to claim 1, wherein the application of the adhesive is performed by a screen printing method. 10. The method for manufacturing an optical recording medium according to claim 1, wherein the application of the adhesive is performed in a vacuum atmosphere. 11. The method for manufacturing an optical recording medium according to claim 1, wherein said adhesive is applied to a substrate having an optical recording section. 12. The method according to claim 1, wherein said adhesive is applied to a substrate on which at least one dielectric film is formed.
Item 14. The method for producing an optical recording medium according to any one of Items 1. 13. The method of manufacturing an optical recording medium according to claim 1, wherein said adhesive is an ultraviolet (UV) curing adhesive, and said method includes a step of exposing said adhesive to UV. Method. 14. The adhesive according to claim 14, wherein the adhesive is a cyanoacrylate-based adhesive,
The method for producing an optical recording medium according to any one of claims 1 to 12, wherein the optical recording medium is a two-part curing epoxy type or a two-part curing urethane type. 15. The method for manufacturing an optical recording medium according to claim 1, wherein said adhesive is of an anaerobic curing type. 16. The method for manufacturing an optical recording medium according to claim 2, wherein said step of applying a load is in a vacuum atmosphere. 17. The step of applying a load and UV in the atmosphere.
14. The method for manufacturing an optical recording medium according to claim 2, wherein the steps of performing the exposure are performed at least simultaneously in a time series. 18. The method according to claim 2, wherein the step of applying a load, the step of bonding the substrates in a vacuum atmosphere, and the step of performing UV exposure in a vacuum atmosphere are continuous. Manufacturing method of an optical recording medium. 19. The method according to claim 19, wherein in the step of applying the adhesive in a ring shape, the variation in W of the ring-shaped application is 5% or less, and D ₂
The method of manufacturing an optical recording medium according to any one of claims 1 to 5, wherein / D ₁ is 0.6 or more and α is 25 ° or less. 20. A gap between the tip of the dispenser nozzle and the substrate on which the adhesive is applied is 0.02 to 5 mm when the adhesive is applied, and the tip of the nozzle is the adhesive from the beginning to the end of the application. And controlling the sequence in which the tip of the nozzle is separated from the adhesive by moving the nozzle or the turntable vertically when finishing the application of the adhesive. 20. The method for producing an optical recording medium according to any one of items 5 to 19. 21. The optical recording medium according to claim 1, wherein the turntable is moved in a vertical direction after rotating the turntable a plurality of times from the start of coating. Production method. 22. The method according to claim 1, wherein said adhesive applied in a ring shape comprises a ring having a plurality of diameters.
The method for manufacturing an optical recording medium according to any one of items 9 to 21. 23. The adhesive according to claim 1, wherein a variation in the diameter d of the adhesive applied in the form of dots is 25% or less, and D ₂ / D ₁ is 0.6 or more. 2. The method for manufacturing an optical recording medium according to claim 1. 24. When the adhesive is applied, the clearance between the tip of the dispenser nozzle and the substrate to which the adhesive is applied is 0.2 to 5 mm, and the tip of the nozzle is the adhesive from the beginning to the end of application. When the nozzle or the turntable moves vertically when the application of the adhesive is finished, the tip of the adhesive and the nozzle are separated from each other, and a point-like shape of the adhesive is formed. Claims 1 to 1 that control in a sequence in which coating is completed
24. The method for manufacturing an optical recording medium according to any one of items 4, 6, and 23. 25. The method of manufacturing an optical recording medium according to claim 1, wherein said dispenser nozzle comprises a plurality of dispenser nozzles. 26. The rotation speed of the turntable is 5 to 3
8. The method according to claim 1, wherein the adhesive is applied to the substrate surface at a rotational speed of 2000 to 4000 RPM after the adhesive is applied at 00 RPM.
Item 13. The method for producing an optical recording medium according to Item 1. 27. The optical recording medium according to claim 1, wherein the surface speed of the coating roller for applying the adhesive is 0.001 to 5 mm / sec. Production method. 28. The method for manufacturing an optical recording medium according to claim 1, wherein an elastic body is used for a coating roller for applying the adhesive. 29. The elastic body of a coating roller for applying the adhesive, wherein a material having good wettability with the adhesive and a material having poor wettability with the adhesive are used.
9. The method for manufacturing an optical recording medium according to any one of items 8 to 9. 30. The optical recording medium according to claim 1, wherein an elastic body having an uneven pattern formed on an application roller for applying the adhesive is used. Manufacturing method. 31. The method according to claim 1, wherein said UV-curable adhesive of radical polymerization reaction type is used.
Item 14. The method for producing an optical recording medium according to any one of Items 1. 32. A UV irradiation energy of 100 mj / cm ²
The method for manufacturing an optical recording medium according to any one of claims 1 to 13 and 16 to 31, wherein the UV curing adhesive is cured as described above. 33. The method for producing an optical recording medium according to any one of claims 1 to 13, 16 to 30, and 32, wherein said UV-curable adhesive provided with anaerobic properties is used. 34. An optical recording medium having a contact bonding structure in which two substrates are bonded with an information recording layer portion as an inner surface, wherein the substrate is bonded by using an adhesive in a vacuum atmosphere. An optical recording medium, comprising: 35. A UV-curable adhesive wherein the adhesive is a radical polymerization reaction type, and the photopolymerization initiator is Irgacure 65.
35. The optical recording medium according to claim 34, wherein the medium comprises 1 or Irgacure 907. 36. The optical recording medium according to claim 34, wherein the bonding stress is 1 kg / cm ² or less per its own weight or per unit area of the substrate. 37. The optical recording medium according to claim 34, wherein the viscosity of the adhesive is 4 to 1000 cps. 38. The optical recording medium according to claim 34, wherein the degree of vacuum is from 30 torr to 5 × 10 ⁻³ torr. 39. The optical recording according to claim 34, wherein a catalytic function substance for promoting a curing reaction of the adhesive is disposed on a surface of the substrate in contact with the adhesive. Medium. 40. The substrate according to claim 34, wherein said substrate has one or more grooves, steps, or tapers concentric with said substrate in the periphery of one principal surface of said substrate to be bonded. The optical recording medium according to claim 1. 41. A substrate having one or more groups, steps or tapers concentric with the substrate, and the substrate having a smooth surface around one principal surface of the substrate to be bonded. 39. The optical recording medium according to any one of the items 34 to 38. 42. The optical recording medium according to claim 34, wherein the material of said substrate is plastic or glass.