JPH11126377A - Production of optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing an optical disk capable of form a light transparent layer of a small thickness and uniform thickness and easily producing the optical disk of a large capacity. SOLUTION: A substrate 101 formed with information signal parts is prepd. and after adhesive layers are formed on the information signal parts of this substrate 101 by applying an adhesive or tacky adhesive thereon at an approximately uniform film thickness, a transparent plastic film 112 is press-fixed in superposition onto these adhesive layers while this film is held tense. The transparent plastic film 112 previously formed with the adhesive layers by applying the adhesive or tacky adhesive at an approximately uniform film thickness is otherwise press-fixed to the information signal parts of the substrate 101 in superposition thereon while the transparent plastic film is held tense. The base previously formed with the adhesive layers by applying the adhesive or tacky adhesive at the approximately uniform film thickness is otherwise press-fixed to the information signal parts of the substrate in superposition thereon while the base is held tense and thereafter the base is peeled and removed from the adhesive layers and the remaining adhesive layers are formed as light transparent layers. The optical disk which is provided with the light transparent layers consisting of the transparent plastic film 112 on the substrate 101 formed with the information signal parts and with which the recording and/or reproducing of the information is executed by irradiating the information signal parts with a laser beam from this light transparent layer side is thus produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having a light transmitting layer provided on a substrate provided with an information signal portion, and irradiating a laser beam from the light transmitting layer to record and reproduce information. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as an optical disk, a replica substrate made of a light-transmitting plastic having irregularities formed on one surface is manufactured, and a reflective film or a recording film is provided on the surface having the irregularities to form an information signal portion. Further, a protective film is formed on the information signal portion, and recording and reproduction are performed by irradiating a laser beam from the flat surface side (the surface opposite to the surface on which the information signal portion is formed) of the substrate. Is widely known.

In such an optical disk, since the substrate plays a role of a light transmitting layer, it is required to reduce the thickness of the substrate when considering a capacity increase of, for example, 8 GB or more.

However, in the above-mentioned optical disk, the substrate is usually formed by injection molding, and there is a limit to the reduction in thickness.

For example, in the case of manufacturing a substrate having a diameter of 120 mm, if it is intended to ensure the transferability of irregularities at a normal level (the level of a conventional optical disk), a thickness of 3 mm is required.
The limit is about 00 μm. In order to accurately transfer irregularities in response to an increase in capacity, a thickness of about 500 μm is the limit.

For this reason, it is very difficult to produce an optical disk substrate having a thickness of about 100 μm and fine irregularities accurately transferred thereon by injection molding.

This is due to a problem inherent in injection molding. For example, unevenness in the flow state of the injection material in the mold, ie, the molten resin, unevenness in the cooling rate of the mold (uneven temperature and viscosity of the molten resin). ) Etc.

[0008]

In such a situation,
The applicant of the present application proposes that 177 is provided on the substrate on which the information signal portion is formed.
We have proposed an optical disc that performs recording and reproduction by forming a light transmission layer of μm or less and irradiating a laser beam from the light transmission layer side.

In this optical disk, since the substrate can have a normal thickness (for example, 1.2 mm or 0.6 mm), it is possible to transfer irregularities with high precision by injection molding. On the other hand, laser light for recording and reproduction is applied from the light transmitting layer side having a small thickness, so that it is possible to cope with an increase in capacity.

When recording and reproduction are performed by irradiating laser light from the light transmitting layer side, how to form the light transmitting layer is a major problem. This is because a change in the thickness of the light transmitting layer or the like greatly affects the characteristics.

As a method of forming the light transmitting layer, for example, a method of applying an ultraviolet curable resin by a spin coating method or the like can be considered, but in this case, it is difficult to form a film having a uniform film thickness.

Accordingly, the present invention provides a method of manufacturing an optical disk capable of forming a light-transmitting layer having a small thickness and a uniform thickness and easily manufacturing a large-capacity optical disk. With the goal.

[0013]

In order to achieve the above object, the present invention provides a light transmitting layer made of a transparent plastic on a substrate on which an information signal portion is formed, and the information transmitting layer is formed from the light transmitting layer side. When manufacturing an optical disc in which information is recorded and / or reproduced by irradiating a laser beam to a signal portion, a substrate on which the information signal portion is formed is prepared, and an adhesive or an adhesive is provided on the information signal portion of the substrate. The method is characterized in that an adhesive is applied to a substantially uniform film thickness to form an adhesive layer, and then the transparent plastic film is overlaid on the adhesive layer and pressed while keeping the transparent plastic film in a tensioned state.

According to the present invention, a light transmitting layer made of a transparent plastic is provided on a substrate on which an information signal portion is formed, and the information signal portion is irradiated with laser light from the light transmitting layer side to record and record information. When manufacturing an optical disk for performing reproduction, a substrate on which the information signal portion is formed is prepared, and a transparent plastic film having an adhesive layer formed by applying an adhesive or a pressure-sensitive adhesive to a substantially uniform thickness in advance is prepared. It is characterized in that the substrate is pressure-bonded while being superposed on the information signal portion of the substrate while maintaining the tension state.

Further, according to the present invention, a light transmitting layer is provided on a substrate on which an information signal portion is formed, and the information signal portion is irradiated with laser light from the light transmitting layer side to record and / or reproduce information. When manufacturing an optical disk as described above, prepare a substrate on which the information signal portion is formed, and apply an adhesive or a pressure-sensitive adhesive to a substantially uniform film thickness in advance to maintain the support on which the adhesive layer is formed in a tensioned state. After overlapping and pressing on the information signal portion of the substrate, the support is peeled off from the adhesive layer,
The remaining adhesive layer is a light transmitting layer.

According to the present invention, a light transmission layer having a very small thickness and having no thickness unevenness is easily formed on the substrate on which the information signal portion is formed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing one configuration of an optical disk manufacturing apparatus, and FIG. 2 is a sectional view showing a structure of a substrate to be prepared in advance when manufacturing an optical disk by the apparatus shown in FIG. is there.

This apparatus is provided with a substrate holding mechanism 21 and an adhesive application mechanism provided with an adhesive dropping mechanism (resin dropping mechanism) 31 for dropping an ultraviolet-curable adhesive 81a onto a substrate (disk substrate) 101 held by the mechanism. Apparatus 11, roll material 1
Film running in which the film 112 unwound by rotation of the unwinding roller 42 from 11 (a film obtained by winding a light-transmissive plastic film 112 around a core) runs horizontally in a tensioned state (no slack or stretch). The apparatus includes a device 41, a pressure roller 51 provided along a running path of the film 112, an ultraviolet irradiation device 52, and a film punching device 53.

The plurality of adhesive coating devices 11 are provided substantially. That is, one adhesive dropping mechanism (resin dropping mechanism) 31 provided at a fixed position and a plurality of substrate holding mechanisms 21 that can freely circulate are provided.
By means of 1, it is possible to cover the drop of the adhesive on the substrate held by each substrate holding mechanism 21.

The substrate holding mechanism 21 is provided with a disk stage 28 having a vacuum suction portion (vacuum chuck) for holding the substrate at the upper end. Further, the substrate holding mechanism 21
Is in a line on a capsule-shaped endless rail with a planar shape,
The rails are arranged at equal intervals, and can be freely circulated by the drive mechanism. When the rails travel along a straight portion of the rail, the substrate suction portion of the disk stage 23 comes close to the film 112 and is integrated therewith. (Running in the same direction and speed) at the same time, and can be stopped and restarted intermittently at a predetermined position and in synchronization with the film 112.
A substrate supply robot (not shown) provided with an arm having a substrate vacuum suction part at an appropriate position near the rail.
Deploy.

The film traveling device 41 includes a film 112
The first is disposed at an appropriate distance from each other in the direction of the traveling road
A guide roller (first capstan) 43, a second guide roller (second capstan) 44,
4 and a film take-up roller 45 provided at the subsequent stage. The first and second guide rollers 4
Reference numerals 3 and 44 denote idle rollers. The film traveling device 41 is configured to stop traveling of the film 112 at a predetermined timing. The pressure roller 51, the ultraviolet irradiation device 52, and the punching device 53 are provided with the first and second guide rollers 43 in this order along the film traveling path.
44, and the pressure roller 51 is arranged so as to be positioned on the side closest to the roll material 111.

Further, when the film 112 is formed by laminating the protective film 113 as in this example, the protective film winding roller 4 for winding and collecting the protective film 113 peeled off from the film 112 is used.
6 is provided.

The pressure roller 51 is an idle roller, like the first and second guide rollers 43 and 44.
The rotation axis is arranged orthogonal to the film traveling path. further,
The pressure roller 51 is vertically movable by an elevating mechanism, and fine adjustment of the vertical position can be performed. The ultraviolet irradiation device 52 is configured by arranging ultraviolet lamps in parallel,
The first adhesive-coated surface is provided above the film traveling path so that ultraviolet rays can be irradiated from the film 112 side. In the punching device 53, two cylindrical cutting blades are provided concentrically so as to be movable up and down, and the inner diameter portion (center hole 102: see FIG. 2) and the outer diameter portion of the substrate of the film adhered to the substrate 101 are formed. Be able to punch. Further, at a predetermined position near the punching device 53,
An optical disk collection robot (not shown) provided with an arm having a substrate vacuum suction part is provided.

Next, the manufacturing process of the optical disk by the apparatus shown in FIG. 1 and its operation will be described.

The manufacturing process of the optical disk is as follows.
The method is divided into (1) a substrate preparation step, (2) a step of applying an ultraviolet-curable adhesive to a substrate, and (3) a step of attaching a light-transmitting plastic film (adhesion step). In addition, this attaching step is divided into a step order, a film pressing step to a substrate, a curing step of an ultraviolet curable adhesive, and a film punching step (a step of removing excess film).
Consists of

First, the substrate 101 shown in FIG. 2 is prepared.
This substrate 101 has a center hole 102 at the center,
It is assumed that the information signal unit 108 is provided on one side. In this case, the replica substrate 101a is manufactured by injection molding using a predetermined stamper, and a recording film or a reflective film 103a (a reflective layer, a film made of a magneto-optical material, or a film made of a phase change material) Or organic dye film)
Is formed to form the information signal portion 103. The thickness of the replica substrate 101a is, for example, 0.6 to 1.2 mm.
And Aluminum is used as the material of the reflection film, for example. The optical disk to be manufactured is ROM (Read Only Me)
(mory), an aluminum reflective film is provided, and for a writable disc, a film made of a magneto-optical material, a phase change material, or an organic dye material is provided.

An ultraviolet curing adhesive is applied on the information signal portion 103 of the substrate 101 in a pattern shown in FIG. 3 or FIG.

For this purpose, the substrate supply robot holds a plurality of substrates 101 one by one by dividing them into respective substrate holding mechanisms 21 (actuating the vacuum chuck), and intermittently holds these holding mechanisms 21 on the rails. And run together. Then, these holding mechanisms 21 are sequentially positioned (intermittently) immediately below the adhesive dropping mechanism 31, and the ultraviolet curable adhesive 31 a is dropped from the adhesive dropping mechanism 31 here.

In order to prevent the adhesive from flowing down from the substrate during the transfer of the substrate, it is preferable to set the viscosity to 500 cps or more. Further, according to the application pattern, the adhesive is easily spread over the entire surface of the substrate, and the adhesive can be easily prevented from protruding from the outer peripheral edge of the substrate. When the application pattern is as shown in FIG. 3, a multi-point nozzle is used as the adhesive dropping mechanism 31, and when the pattern is as shown in FIG. What is necessary is just to move by a Y stage.

As the adhesive, it is not always necessary to use an ultraviolet-curable adhesive, but a pressure-sensitive adhesive, a dry photopolymer or the like can be used. However, since it is difficult to apply these pressure-sensitive adhesives and dry photopolymers, the one formed on the support is punched into the shape of the substrate 101, which is then pasted on the information recording unit 103, and The body may be peeled off. When a pressure-sensitive adhesive is used, an ultraviolet irradiation step described below is not required.

On the other hand, the roll material 111 is a film 1
12, for example, polycarbonate film, PMMA
It is assumed that a (polymethyl methacrylate) film or a functional norbornene resin (for example, ARTON manufactured by Nippon Synthetic Rubber Co., Ltd.) is wound around a core. The film 112 has a thickness of, for example, 10 to 150 μm.
And the thickness unevenness (difference between the maximum thickness and the minimum thickness) is 10 μm.
m, preferably <5 μm or less. The sum of the thickness variation of the adhesive applied and the thickness variation of the film 112 is 10 μm.
By setting m or less, an extremely high-quality optical disk can be obtained. These films can be easily formed by a T-die method and a casting method (solution casting method).

In parallel with the intermittent adhesive application, the film running device 41 is operated to make the film 112 run intermittently, and the running speed during running is kept constant. In this case, by appropriately controlling the number of rotations of the feeding roller 42 and the film take-up roller 45, the film 112 is always maintained in a tensioned state, and the protection film 113 peeled off from the film 112 is collected by the take-up roller 46. .

Then, the substrate 101 on which the adhesive has been applied is sequentially and intermittently moved along the film 112. Each time the substrate is located immediately below the punching device 53, the running of the film and the substrate is stopped. The film is punched. Hereinafter, this step will be described with reference to FIG.

As shown in FIG. 5A, the film 112
And the substrate 101 is run at the same speed. in this case,
While moving the substrate 101 in the horizontal direction, the film 112 between the first guide roller 43 and the crimp opening
Is a downward slope from the former to the latter,
A gap is appropriately formed between the film 112 and the adhesive 31a on the side closer to the first guide roller 43 of the upper surface, and the film 11 is
2 is pressed against the adhesive 31a. For this purpose, the vertical positions of the first guide roller 43 and the pressure roller 51 are appropriately set and maintained.

In this way, the pressure roller 51 rolls on the overlapped portion of the film and the substrate relative to the film and the substrate in the horizontal direction by the frictional force caused by the running of the film 112, and generates air between the film and the adhesive. (Bubbles) can be quickly and reliably eliminated through the gap, and the thickness of the adhesive layer 31b (see FIG. 8) can be highly uniformized over the entire substrate. Can be performed while the film is running.

After the film 112 is pressed, an autoclave treatment or a defoaming treatment under reduced pressure is carried out.
Air (bubbles) between the film and the adhesive may be reliably removed.

Next, while the film 112 and the substrate 101 are integrally moved while maintaining the state in which the film 112 is pressed against the adhesive 31a, ultraviolet rays are irradiated by the ultraviolet irradiation device 52 as shown in FIG. The film is adhered to the substrate by irradiating from the film 112 side and polymerizing and curing the adhesive. Continue running the film and substrate,
When the substrate is located immediately below the punching device 53, these are stopped, and as shown in FIG. 5C, the inner and outer diameter portions of the substrate are punched out of the film adhered to the substrate. The film punched out of the circular through hole is collected by the take-up roller 45.

As shown in FIG. 5B, at the time of performing the adhesive curing step, the next substrate 102 is approaching the first guide roller 43, and as shown in FIG.
When performing the punching step, the next substrate 102 is the first substrate.
It is located between the guide roller 43 and the pressure roller 51.

In the deaeration / compression bonding step using the apparatus shown in FIG. 1, a method is also employed in which the running of the film and the substrate is stopped, and the compression roller 51 is forcibly rolled toward the first guide roller 43 during this time. it can.

By the punching step, an optical disc 201 having a structure in which the information signal portion 103, the adhesive layer 31b, and the film 112 are laminated in this order on the replica substrate 101a as shown in FIG. 8 is obtained. The optical disk on the substrate holding mechanism 21 is recovered by the optical disk recovery robot while the traveling of the mechanism 21 is stopped, and then the substrate is supplied to the holding mechanism 21 from the substrate supply robot and sucked and held again. Then, the substrate is returned to the adhesive dropping mechanism 31.

6 and 7 show another example of the optical disk manufacturing apparatus and the manufacturing method. FIG. 6 is a schematic front view, and FIG. 7 is a plan view of FIG.

This apparatus feeds a film 112 fed from a roll-shaped material 111 by a feed roller 62 in a horizontal direction in a tensioned state, and supplies an adhesive 81a onto the film 112 running in a horizontal direction. An adhesive supply mechanism 33, an adhesive thinning member (scraping member) 71, a substrate mounting robot (not shown), pressure rollers 72 and 73, an ultraviolet irradiation device 52, a punching device 58, An optical disk take-out device 54 provided immediately below the punching device and an optical disk collection robot (not shown) are provided.

The structure of the film running device 61 is the same as that of the device shown in FIG. 1, and the first and second guide rollers 63, which are arranged at an appropriate distance from each other in the horizontal running direction of the film 112.
64, and a film take-up roller 65 provided at the subsequent stage of the second guide roller 64. Further, in this optical disk manufacturing apparatus, the first guide roller 63, the adhesive supply mechanism 33, the scraping member 71, the crimping opening rollers 72 and 73, the ultraviolet irradiation device 52, the punching device 53, the disk extracting device 54, and the second guide roller The first guide rollers 63 are arranged in this order along the film traveling path, and such that the first guide roller 63 is located on the side closest to the roll-shaped raw material 111. The film traveling device 61 is configured to stop traveling of the film 112 at a predetermined timing.

One adhesive supply mechanism 33 is provided at a fixed position, and the adhesive is dropped and supplied from a wide linear nozzle whose length is equal to or slightly larger than the outer diameter of the substrate 101. Can be done. However, unlike the apparatus of FIG. 1, a substrate holding mechanism is not provided (it is not necessary).
The scraping member 71 scrapes off an excess of the adhesive applied on the film 112 to set the film thickness to a desired value and widens the application width of the adhesive on the film. , And can be finely adjusted in the vertical position. The scraping member 71 is a doctor blade or a rubber squeegee.

The substrate mounting robot is provided with an arm having a vacuum suction part for the substrate, and is provided at a position near the scraping member 71. As shown in FIGS. 6 and 7, the robot holds the substrate 101 directly above the film 112 such that the flat surface opposite to the information signal unit 103 has a downward slope from the scraping member 71 toward the pressure roller. After the positioning, the vacuum suction is released and the substrate 101 can be placed on the film 112.

The first and second guide rollers 63 and 64 and the pressure rollers 72 and 73 are idle rollers, and these pressure rollers have their rotation axes arranged perpendicular to the film traveling path. Also, first and second guide rollers 63 and 64, and
The pressure roller 73 disposed below the film 112 fixes the vertical position, whereas the pressure roller 72 disposed above the film 112 is vertically movable by an elevating mechanism.
In addition, the vertical position can be finely adjusted.

The ultraviolet irradiation device 52 is provided below the film 112 so that the surface of the substrate 101 coated with the adhesive can be irradiated with ultraviolet light from the film 112 side. The optical disk take-out device 54 is for collecting the manufactured optical disk from the film traveling path, and has a vacuum suction part for the substrate, which can be moved up and down by a lifting mechanism and can finely adjust the vertical position. 6, it is movable in a horizontal direction perpendicular to the plane of the drawing. Further, the optical disk collection robot is provided with an arm having a vacuum suction part for the substrate, and is disposed at the horizontal moving end position of the optical disk pickup device 54.

Note that, as in the apparatus shown in FIG.
When the protective film 2 is formed by laminating a protective film, a protective film take-up roller (not shown) for winding and recovering the protective film peeled from the film 112 is provided.

Next, the manufacturing process of the optical disk by the apparatus shown in FIG. 6 and its operation will be described.

First, the following preparation operation is performed.

(1) The substrate 101 shown in FIG. 2 is prepared.

(2) After running the film running device 61 temporarily to tension the film 112, the running of the film is stopped.

(3) The tip of the scraping member 71 is positioned at 20 μm or less immediately above the film 112. Hereinafter, this state is always maintained during the manufacturing process of the optical disk.

(4) The vertical spacing between the pressure rollers 72 and 73 is set to an appropriate value.

Next, the film running device 61 is operated again to make the film 112 run intermittently, and the running speed during running is kept constant. In this case, the feeding roller 62
By appropriately controlling the number of revolutions of the film take-up roller 65, the film 112 is always maintained in a tension state. During film running, the adhesive 8 is supplied from the adhesive supply mechanism 33.
1a is dropped and supplied to the film 112.

The film 11 is moved by the substrate mounting robot.
The substrate 101 mounted on the substrate 2 (see below) is run integrally with the film 112 and inserted between the pressure rollers 72 and 73, where the film and the substrate coated with the adhesive are pressed.

Also in this case, air (bubbles) between the film and the adhesive may be reliably removed by performing an autoclave treatment or a defoaming treatment under reduced pressure after the film 112 is pressed.

Next, the substrate 101 is moved integrally with the film 112, and ultraviolet light is irradiated from the film side by the ultraviolet irradiation device 52, and the adhesive is polymerized and cured to adhere the film to the substrate. The running operation of the film is continuously performed, and the substrate is positioned immediately below the film punching device 53. The pressing operation and the ultraviolet irradiation operation are performed while running the film.

Each time each substrate 101 is located immediately below the punching device 53, the running of the film 112 is stopped and the supply of the adhesive to the film 112 is stopped. While the film running is stopped, a film punching operation and a substrate mounting operation on the film by the substrate mounting robot are performed.

In the above-described film punching operation, the vacuum suction portion of the optical disk take-out device 54 is moved immediately below the film 112.
It is raised to the nearest position and receives the descending cylindrical cutting blade. After lowering the optical disk removal device 54 and moving it in the horizontal direction, the optical disk recovery robot collects the optical disk. Next, the optical disk take-out device 54 is raised again to a position immediately below and immediately below the film 112 to prepare for the next punching operation. Immediately after the punching operation and the substrate mounting operation, the film running and the adhesive supply operation are restarted.

In the substrate placing operation, the substrate placing robot holds the substrate 101 above the film traveling surface and in a state inclined with respect to the traveling surface (see FIG. 6).
The substrate is lowered in this posture, and the substrate holding is released when the outer peripheral edge of the substrate comes into contact with the adhesive 31a or comes close to the adhesive 31a, and the substrate is placed on the film by its own weight. During the mounting of the substrate, the inclination angle of the substrate with respect to the film, and hence the gap between the substrate and the adhesive gradually decreases,
Most of the air (bubbles) in the gap can be eliminated.

Since the pressure rollers 72 and 73 are pressed by the frictional force caused by the running of the film and the substrate while pressing the overlapped portion of the film and the substrate in the horizontal direction relative to the rollers,・ A small amount of air (bubbles) remaining between the adhesives can be reliably removed.
There is an advantage that the thickness of the adhesive layer 31a (see FIG. 8) can be made highly uniform over the entire substrate, and the bonding operation can be performed while running the film.

As described above, the manufacturing process of the optical disk by the apparatus shown in FIG. 6 uses a substrate having a predetermined structure prepared in advance and a predetermined thin transparent film.
A first step of supplying an adhesive to the film while the film is running; (2) a second step of scraping the adhesive on the film due to the relative movement between the running film and the scraping member 71;
(3) a third step of placing the substrate on the adhesive applied to the film while the film traveling is stopped, and (4) a period of moving the substrate between the pressure bonding rollers 72 and 73 integrally with the film. A fourth step of performing a pressure bonding operation between the film and the adhesive (substrate), (5) a fifth step of performing a film bonding operation on the substrate by irradiating ultraviolet rays during traveling of the film-bonded substrate,
(6) A sixth step of stopping the substrate immediately below the punching device and punching a film to complete the optical disk, and (7) a seventh step of taking out and recovering the optical disk.

Next, an optical disk manufacturing apparatus and a manufacturing process using a film having an adhesive layer having a uniform thickness will be described.

In this embodiment, a pressure-sensitive adhesive sheet or a dry photopolymer is used as the adhesive layer.

The pressure-sensitive pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet made of, for example, an acrylic pressure-sensitive adhesive and having excellent transparency and uniformity in thickness, and has a trade name of DA-8320 manufactured by Nitto Denko Corporation.
DA-8310 and the like are preferred.

Dry photopolymers are 200 to 300
An ultraviolet-curable adhesive sheet having a viscosity of about megapoise and containing no solvent. For example, SURPHEX (trade name, manufactured by DuPont) can be used.

FIG. 9 shows an original roll of the film 112 on which the pressure-sensitive adhesive sheet or the adhesive layer 201 made of dry photopolymer is formed. Note that FIG.
As shown in (1), the surface of the film 112 may be subjected to a surface treatment in advance to form a protective layer 204 made of an inorganic substance or an organic resin. As inorganic substances, SiN, SiO ₂ , S
iC or the like may be used, and these may be formed into a film with a thickness of about 10 to 2000 ° to form the protective layer 204. Usually, the above-mentioned protective layer is formed by a sputtering method, a spin coating method, or the like after completion of a disc-shaped optical disk. It is possible to reduce the number of materials and materials, and to eliminate the necessity of managing the foreign matter and viscosity of the resin required when coating the organic resin.

Using this material roll, as shown in FIG. 10, the information recording section 103 of the substrate 101 (this information recording section 1
A recording film or a reflective film 103a is formed on the substrate 03. ) The film 112 is overlaid with the adhesive layer 201 interposed therebetween.

In this state, the film 112 is pressure-bonded to the substrate 101 by the pressure roller 202, and the film 112 is brought into close contact with the information recording portion 103 so that the adhesive layer 201 enters.

When a dry photopolymer is used for the adhesive layer 201, it is irradiated with ultraviolet rays by a UV lamp 203 and is cured. In the case of a pressure-sensitive adhesive sheet, the UV irradiation by the UV lamp 203 is unnecessary.

After the adhesive layer 201 is pressed against the information recording section 103, air (bubbles) in the film / adhesive layer or in the adhesive layer is removed by performing an autoclave treatment using a pressure cooker or a defoaming treatment under reduced pressure. It may be excluded.

Finally, the film 112 and the adhesive layer 2
01 is punched into the shape of the substrate 101 to complete the optical disk.

Specifically, a polycarbonate film (thickness: 50 μm) on which a pressure-sensitive adhesive sheet (thickness: DA-8310, manufactured by Nitto Denko Corporation) having a thickness of 50 μm was stuck to the substrate 101, and then pressed and punched. By performing trimming in the process, an optical disc having a light transmitting layer having a thickness of 100 μm was completed. After that, foaming was significantly reduced by performing an autoclave treatment.

In the above manufacturing apparatus and manufacturing method, both the polycarbonate film 112 and the adhesive layer 201 are used as the light transmitting layer. However, when the pressure-sensitive adhesive sheet or the dry photopolymer is used, only the adhesive layer 201 is used. It can also be a light transmitting layer.

FIG. 12 shows this step. The process shown in FIG. 12 is basically the same as the process shown in FIG. 10, but is significantly different from the process shown in FIG. 10 in that the support 205 of the adhesive layer 201 is peeled off after pressure bonding.

As a result, only the adhesive layer 201
It remains on top and functions as a light transmitting layer. Therefore, it is not necessary to use a film having excellent light transmittance such as a polycarbonate film for the support 205,
Any material, such as release paper, can be used.

For example, the thickness of the adhesive layer 201 is 50 μm.
Pressure-sensitive adhesive sheet (trade name: DA-83, manufactured by Nitto Denko Corporation)
The optical disk having a light transmitting layer having a thickness of 50 μm can be obtained by removing the support 205 after attaching the substrate to the substrate 101 by using the method 10).

Similarly, an adhesive layer 201 having a thickness of 50 μm
Dry photopolymer (SUR, trade name, manufactured by DuPont)
PHEX), and after attaching this to the substrate 101,
By peeling off the support 205, an optical disk having a light transmitting layer having a thickness of 50 μm can be obtained.

In any case, by repeating these processes, a light transmitting layer having a thickness that is a multiple of the thickness of the adhesive layer 201 can be obtained.

Although the method for forming the light-transmitting layer using the pressure-sensitive adhesive sheet and the dry photopolymer has been described above, it goes without saying that various changes can be made in the process.

For example, in the manufacturing process shown in FIGS. 10 and 12, the pressure bonding roll 202 is used for pressure bonding, but a pressure bonding pad 206 such as a rubber pad may be used as shown in FIG.

The method for manufacturing an optical disk having a light transmitting layer has been described above, but it is also possible to bond the manufactured optical disks with the substrate 101 back to back and bond them to form a double-sided disk.

FIG. 14 shows a manufacturing process of this double-sided disk. In this manufacturing process, for example, the substrate 1 on which the film 112 is attached in the above-described process is used.
01 are prepared, and a slow-acting ultraviolet curable resin 207 is applied to the back surface of each substrate 101 (the surface opposite to the surface on which the information recording unit 103 and the film 112 are laminated).
The slow-acting ultraviolet curable resin does not cure immediately upon irradiation with ultraviolet light but cures slowly. For example, Sony Bond 95A14X (trade name, manufactured by Sony Chemical Co., Ltd.) can be used.

Then, ultraviolet rays are applied to the ultraviolet curable resin having a delayed effect applied to the substrate 101, and then the substrate 101 is press-bonded with a press pad (or press roll) 208. After pressing, the slow-acting ultraviolet curable resin gradually cures to complete a double-sided disc.

Here, the reason why a slow-acting ultraviolet curable resin is used is that the information recording section 103 is formed on each substrate 101, and the ultraviolet ray reaches the ultraviolet curable resin 207 even if the ultraviolet ray is irradiated after bonding. Because it does not.

Alternatively, it is also possible to use a pressure-sensitive adhesive sheet in the process of producing a double-sided disk.

FIG. 15 shows a bonding step using the pressure-sensitive adhesive sheet. In this step, first, the pressure-sensitive adhesive sheet 210 supported by the support 209 is attached to one substrate 101, and the support 209 is peeled off.

On the other hand, the other substrate 101 is overlapped back to back, and these are put on a pair of pressure rolls 211, 2.
12 and sandwiched. In this case, an ultraviolet irradiation step or the like is not required, and a double-sided disk can be easily manufactured.

[0091]

As described above in detail, according to the optical disk manufacturing method of the present invention, a light transmitting layer having a small thickness and a uniform thickness can be formed, and a large-capacity optical disk can be formed. Can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a configuration of an optical disk manufacturing apparatus.

FIG. 2 is a schematic sectional view showing a structure of a substrate prepared in advance when manufacturing an optical disc.

FIG. 3 is a schematic diagram showing an example of a pattern for applying an ultraviolet-curable adhesive to a substrate.

FIG. 4 is a schematic view showing another example of an adhesive application pattern.

FIGS. 5A and 5B show an optical disk manufacturing method using the apparatus of FIG. 1 in the order of steps, wherein FIG. 5A is a schematic view of a step of pressing a plastic film on an adhesive layer on a substrate, and FIG. FIG. 3C is a schematic view of a step of irradiating ultraviolet rays, and FIG. 3C is a schematic view of a plastic film punching step.

FIG. 6 is a schematic diagram showing another configuration example of the optical disc manufacturing apparatus.

7 is a schematic plan view of the optical disk manufacturing apparatus shown in FIG.

FIG. 8 is a schematic sectional view showing the structure of an optical disk to be manufactured.

FIG. 9 is a schematic diagram showing a raw roll of a film on which an adhesive layer is formed.

FIG. 10 is a schematic view showing an optical disk manufacturing process using a film having an adhesive layer formed thereon.

FIG. 11 is a schematic diagram showing an original roll of a film on which an adhesive layer and a protective layer are formed.

FIG. 12 is a schematic view showing another example of an optical disc manufacturing process using a film having an adhesive layer formed thereon.

FIG. 13 is a schematic diagram showing a state of pressure bonding by a pressure bonding pad.

FIG. 14 is a schematic view showing an example of a process for manufacturing a double-sided disk using a slow-acting ultraviolet curable resin.

FIG. 15 is a schematic view illustrating an example of a manufacturing process of a double-sided disc using a pressure-sensitive adhesive sheet.

[Explanation of symbols]

101 substrate, 103 information signal section, 103a recording film or reflection film, 112 plastic film, 201
Adhesive layer, 205 support

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomomi Yukimoto 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Motohiro Furuki 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation

Claims (30)

[Claims] 1. A light transmitting layer made of transparent plastic is provided on a substrate on which an information signal portion is formed, and the information signal portion is irradiated with laser light from the light transmitting layer side to record and / or reproduce information. When manufacturing an optical disc to be performed, a substrate on which the information signal portion is formed is prepared, and an adhesive or a pressure-sensitive adhesive is applied on the information signal portion of the substrate to a substantially uniform thickness to form an adhesive layer. An optical disc manufacturing method, wherein the transparent plastic film is superposed on the adhesive layer and pressure-bonded while keeping the transparent plastic film under tension. 2. The method according to claim 1, wherein the adhesive layer is made of an ultraviolet curable resin. 3. The method according to claim 2, wherein the ultraviolet curable resin is a dry photopolymer. 4. The method of manufacturing an optical disk according to claim 2, wherein the transparent plastic film is overlaid on an adhesive layer and pressed, and then ultraviolet rays are irradiated from the transparent plastic film side to cure the ultraviolet curable resin. Method. 5. The method according to claim 1, wherein the adhesive layer is a pressure-sensitive adhesive. 6. As the transparent plastic film,
2. The method for manufacturing an optical disk according to claim 1, wherein a transparent plastic film having a surface treated in advance and having a protective layer formed thereon is used. 7. The method of manufacturing an optical disk according to claim 1, wherein the transparent plastic film is overlaid on the information signal portion of the substrate and pressure-bonded, and then subjected to an autoclave process. 8. The method for manufacturing an optical disk according to claim 1, wherein the defoaming process is performed under reduced pressure after the transparent plastic film is overlaid on the information signal portion of the substrate and pressed. 9. After forming an adhesive layer on the signal recording portion of the substrate, pressure bonding is started while the transparent plastic film is inclined with respect to the adhesive layer, and a gap between the transparent plastic film and the adhesive layer is small. 2. The method for manufacturing an optical disk according to claim 1, wherein the pressing operation is performed by rolling the roller from the side toward the larger side. 10. The method according to claim 1, wherein the substrate and the transparent plastic film are caused to travel at substantially the same speed, and the pressing is started from a downstream position in a traveling direction of the substrate, and the roller is rolled in a direction opposite to the traveling direction. 9. The method for manufacturing an optical disk according to claim 8, wherein: 11. The method for manufacturing an optical disk according to claim 1, wherein an unnecessary portion of the transparent plastic film is removed while leaving a portion adhered to the substrate. 12. A light transmitting layer made of transparent plastic is provided on a substrate on which an information signal portion is formed, and the information signal portion is irradiated with laser light from the light transmitting layer side to record and / or reproduce information. When manufacturing an optical disk to be performed, a substrate on which the information signal portion is formed is prepared, and the transparent plastic film having an adhesive layer in which an adhesive or a pressure-sensitive adhesive is formed in a substantially uniform film thickness is maintained while maintaining the tension. A method for manufacturing an optical disc, comprising superimposing and crimping on an information signal portion of a substrate. 13. The method according to claim 12, wherein the adhesive layer is made of an ultraviolet curable resin. 14. The method according to claim 13, wherein the ultraviolet curable resin is a dry photopolymer. 15. The ultraviolet curable resin according to claim 13, wherein the transparent plastic film is overlaid on the information signal portion of the substrate and pressure-bonded, and then ultraviolet rays are irradiated from the transparent plastic film side to cure the ultraviolet curable resin. An optical disc manufacturing method. 16. The method according to claim 12, wherein the adhesive layer is a pressure-sensitive adhesive. 17. The method for manufacturing an optical disk according to claim 12, wherein a transparent plastic film having a surface treated in advance and having a protective layer formed thereon is used as the transparent plastic film. 18. The method of manufacturing an optical disk according to claim 12, wherein the transparent plastic film is overlaid on the information signal portion of the substrate and pressure-bonded, and then subjected to an autoclave treatment. 19. The method for manufacturing an optical disk according to claim 12, wherein the transparent plastic film is overlaid on the information signal portion of the substrate and pressed, and then defoaming is performed under reduced pressure. 20. A step of applying an adhesive or a pressure-sensitive adhesive to the transparent plastic film to a substantially uniform thickness while running the transparent plastic film to form an adhesive layer, temporarily stopping the transparent plastic film after the formation of the adhesive layer, After holding the substrate in an inclined position on the transparent plastic film, lowering the substrate by its own weight and mounting the substrate on the transparent plastic film; 13. The method for manufacturing an optical disc according to claim 12, further comprising a step of pressing a roller that rolls in a direction opposite to the running direction to a lower surface of the plastic film to perform a pressure bonding operation. 21. A light transmitting layer is provided on a substrate on which an information signal portion is formed, and information recording and / or reproduction is performed by irradiating the information signal portion with laser light from the side of the light transmitting layer. In manufacturing an optical disc, a substrate on which the information signal portion is formed is prepared, and an information signal portion of the substrate is maintained while maintaining a support having an adhesive layer in which an adhesive or a pressure-sensitive adhesive is formed in a substantially uniform thickness in advance. A method for manufacturing an optical disc, comprising: after being superposed on and pressure-bonding, removing the support from the adhesive layer, and using the remaining adhesive layer as a light transmitting layer. 22. The method according to claim 21, wherein the adhesive layer is made of an ultraviolet curing resin. 23. The method according to claim 21, wherein the ultraviolet curable resin is a dry photopolymer. 24. The method according to claim 22, wherein the support is superimposed on the information signal portion of the substrate and pressure-bonded, and then ultraviolet rays are irradiated from the support to cure the ultraviolet curable resin.
A manufacturing method of the optical disc according to the above. 25. The method according to claim 21, wherein the adhesive layer is a pressure-sensitive adhesive. 26. The method for manufacturing an optical disk according to claim 21, wherein after the support is overlaid on the information signal portion of the substrate and pressure-bonded, an autoclave process is performed. 27. The method for manufacturing an optical disk according to claim 21, wherein after the support is overlaid on the information signal portion of the substrate and pressure-bonded, defoaming is performed under reduced pressure. 28. A light transmitting layer is provided on a substrate on which an information signal portion is formed, and the information signal portion is irradiated with laser light from the light transmitting layer side to record and / or reproduce information. A method for manufacturing an optical disk, comprising preparing a pair of optical disks, and bonding surfaces of the optical disks opposite to a surface on which the information signal portion is formed. 29. The optical disk according to claim 28, wherein a slow-acting ultraviolet curable resin is applied to a surface of the optical disk opposite to the surface on which the information signal portion is formed, and is irradiated with ultraviolet light and then bonded. An optical disc manufacturing method. 30. The method for manufacturing an optical disk according to claim 28, wherein the bonding is performed using a pressure-sensitive adhesive.