JP3411525B2 - Method and apparatus for manufacturing information disk - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing an optical disc having a plurality of recording surfaces and a device for manufacturing an optical disc.

[0002]

2. Description of the Related Art In the field of optical discs, a technique for increasing recording capacity has been developed and spread, and the recording capacity tends to be further increased. For example, 4
An optical disc having a layer structure in which two layers are recorded from both sides has a recording capacity of 17 GB called DVD-18. As a method of manufacturing this kind of optical disk, for example, Japanese Patent Laid-Open No. 10-283682 or Japanese Patent Publication No. 8-2394
Some are disclosed in Japanese Patent Publication No. 1 and the like. In the method of manufacturing an optical disk shown in these figures, a stamper is used for each layer in the manufacturing process of one of the recording surfaces, the interface between the stamper and the adhesive layer is peeled off, and information is recorded in the adhesive layer by a pit row. After the transfer, a reflective film is formed on the surface of the adhesive layer on which the pits are formed.

In such a manufacturing method, since the steps using the stamper must be sequentially performed a plurality of times, the length of all the manufacturing steps becomes longer. Further, the process using the stamper needs to be strictly controlled in a clean room, and it is not efficient to perform the process using the stamper alternately with the laminating process having different process characteristics.

In order to solve such a problem, the following disk manufacturing method has been proposed. In this manufacturing method, as shown in the sectional view of the disk in FIG. 5 and its enlarged view in FIG. 6, a dummy which is finally peeled off and removed from the disk substrate 1 which is one side of the information disk and the subsequent step. The disk 2 is used. The disk substrate 1 is the same as a normal one, and is made of a transparent plastic material such as polycarbonate, and a semi-transmissive reflective film made by thinly depositing gold or the like on the pit 1a for recording information on one surface. It comprises a membrane 1b.

The dummy disk 2 is formed by molding a material such as polymethyl methacrylate resin.
A reflective film 2b formed by thinly depositing aluminum or the like on the pit 2a for recording information is provided on one surface thereof. The dummy disk 2 has, for example, a shape and size substantially similar to those of the disk substrate 1, but has a large thickness.

The reflective substrates 1b and 2b of the disc substrate 1 and the dummy disc 2 are adhered to each other via an adhesive layer 3 made of an ultraviolet curable adhesive. In this case, the adhesive strength at the interface between the disk substrate 1 and the reflection film 1b is such that the dummy disk 2 is made of a material such as polymethylmethacrylate resin which is easily peeled off from the reflection film 2b, so that the dummy disk 2 and its reflection It is smaller than any of the adhesive strength at the boundary with the film 2b, the adhesive strength at the interface between the adhesive layer 3 and the reflective film 1b of the disc substrate 1, and the adhesive strength at the boundary between the adhesive layer 3 and the reflective film 2b, and is easy to peel off. There is.
Reference numeral 4 denotes a central hole of the disk substrate 1 and the dummy disk 2.

After the disk substrate 1 and the dummy disk 2 are bonded together in this way, a peeling force is applied between them to separate the dummy disk 2 between the dummy disk 2 and its reflection film 2b. Remove. In this state, a recording layer 1a such as pits, a reflective film 1b, an adhesive layer 3, a recording layer 2a, and a reflective film 2b are sequentially provided on one surface of the disc substrate 1. By laminating two disc substrates having such a structure so that the recording layer and the reflection film are located inside, a DVD having a recording capacity of 17 GB called DVD-18 as described at the beginning can be obtained.

However, since the disk substrate 1 and the dummy disk 2 are formed with the annular grooves 1c and 2c for restricting the spread of the adhesive to the inner peripheral side,
The adhesive 3 that has entered the respective annular grooves 1c and 2c, especially the adhesive 3 that has entered the annular grooves 2c, is
When peeled off, the inner peripheral edge protrusion 3a is formed. Further, when the excess adhesive between the disk substrate 1 and the dummy disk 2 is shaken off by the spin coating method, the adhesive 3 adheres to the outer peripheral edges of those disks, and when the dummy disk 2 is peeled off, the outer peripheral edge protrusion 3b is formed. It was confirmed that it would end up.

[0009]

Therefore, according to the present invention, as described above, the inner peripheral edge projections and / or the outer peripheral edge projections of the adhesive, which are the result of peeling off the dummy disk, are substantially eliminated, so that the subsequent disk is removed. An object of the present invention is to provide a manufacturing method of an information disk which does not hinder the bonding of the information disks and a manufacturing apparatus having a simple mechanism for realizing the manufacturing method.

[0010]

In order to solve this problem, the method according to the first invention is a method of manufacturing an information disk substrate having a first reflective film and a second reflective film that reflect light. In the first method, a disk substrate having information recorded on one side and having the first reflective film and a dummy substrate having information recorded on one surface and having the second reflective film are bonded by an adhesive. And a step of applying a force between the disk substrate and the dummy substrate each having a central hole to separate the dummy substrate from the second reflective film,
A method for manufacturing an information disc, comprising: a second step of removing the inner edge protrusion and a third step of crushing an inner peripheral edge protrusion formed by an adhesive along a central hole of the disc substrate. Is.

In order to solve this problem, the method according to the second invention is a method for manufacturing an information disk substrate having a first reflective film and a second reflective film for reflecting light,
A first step in which information is recorded on one surface and the disk substrate having the first reflective film and a dummy substrate having information recorded on the one surface and having the second reflective film are bonded by an adhesive; A second step of peeling and removing the dummy substrate from the second reflective film by applying a force between the disk substrate and the dummy substrate each having a central hole; And a third step of removing the outer peripheral edge projections formed by the adhesive with a mechanical force.

In order to solve this problem, the method according to the third invention proposes a method for manufacturing an optical disk, characterized by combining the steps of claim 1 and claim 2.

In order to solve this problem, in the method according to the fourth invention, two disk substrates manufactured by the manufacturing method according to any one of claims 1 to 3 are used as the respective second reflective layers. The present invention proposes a method for manufacturing an optical disk, which comprises the step of adhering the above via an adhesive.

In order to solve this problem, a method according to a fifth aspect of the present invention includes a disk substrate manufactured by the manufacturing method according to any one of claims 1 to 3 and information recorded on one side of the disk substrate. The present invention proposes a method for manufacturing an optical disc, which comprises the step of adhering a disc substrate on which two reflective films are formed to each other with an adhesive.

In order to solve this problem, a method according to a sixth invention is an apparatus for manufacturing an information disk substrate having a first reflective film and a second reflective film for reflecting light,
A laminating apparatus for laminating information on one side of the disk substrate having the first reflection film and a dummy substrate having one side of the information recorded on the second reflection film with an adhesive, Peeling means for peeling the dummy substrate from the second reflective film by applying a force between the disc substrate and the dummy substrate, and an inner peripheral edge of the adhesive formed along the central hole of the disc substrate. The present invention proposes an optical disk manufacturing apparatus characterized by comprising a pressing mechanism for crushing a protrusion.

In order to solve this problem, an apparatus according to a seventh aspect of the present invention is the device according to the sixth aspect, wherein a disc pedestal for receiving the disc substrate after the dummy substrate is peeled off is provided with the disc substrate at the center thereof. A head portion that fits in the central hole is provided, and the head portion includes a tapered portion,
The present invention proposes an optical disk manufacturing apparatus characterized by being supported by a coil spring.

In order to solve this problem, an apparatus according to an eighth aspect of the present invention is an apparatus for manufacturing an information disk substrate having a first reflection film and a second reflection film for reflecting light,
A laminating apparatus for laminating information on one side of the disk substrate having the first reflection film and a dummy substrate having one side of the information recorded on the second reflection film with an adhesive, A pedestal having means for receiving the disk substrate and the dummy substrate bonded from the bonding device and adsorbing the disk substrate, and a force is applied between the disk substrate and the dummy substrate to apply the second reflection film. Peeling means for peeling the dummy substrate from
An optical disk manufacturing apparatus, comprising: a removal mechanism that removes an outer peripheral edge protrusion of an adhesive layer formed by the adhesive along the outer peripheral edge of the disk substrate with a mechanical force. Is.

In order to solve this problem, an apparatus according to a ninth aspect of the invention proposes an optical disk manufacturing apparatus characterized by combining the mechanisms of claim 6 or claim 7 and claim 8. is there.

[0019]

1 to 4 are views showing an embodiment of an optical disc manufacturing method and an apparatus for realizing the same according to the present invention. The present invention will be described below with reference to these drawings.

First, FIG. 1 shows an outline of an overall view of a manufacturing apparatus related to the present invention, and 10 shows FIG. 5 and FIG.
The ordinary laminating device for laminating the disc substrate 1 and the dummy disc 2 shown in FIG. 2 with the adhesive 3 is a turntable having a plurality of functional positions to be described hereinafter, and 12 is the disc substrate 1 and the dummy disc 2 which are laminated. The disk transfer mechanism 13 transfers the disk from the laminating apparatus 10 to the disk receiving position 11a of the turntable 11, and when the disks come from the receiving position 11a to the adhesive removing position 11b as the turntable 11 rotates, An adhesive removing mechanism that temporarily removes the adhesive protruding from the outer peripheries of the substrate 1 and the dummy disk 2, and 14 is the cleaning position 1.
Static elimination to remove dust etc. adhering to the disc with 1c
Cleaning mechanism, 15 is a turntable 1
1 position from the receiving position 11a to the reverse position 11d
Since the dummy disk 2 is conveyed downward and the disk substrate 1 is conveyed upward so as not to be damaged before reaching, the dummy disk 2 is reversed at the reverse position 11d.
Is a reversing mechanism with the above.

Next, 16 is a mechanical preliminary peeling mechanism, which mechanically applies a force from the central hole between the disk substrate 1 and the dummy disk 2 at the preliminary peeling position 11e to partially peel them. Numeral 17 blows compressed gas between the disk substrate 1 and the dummy disk 2 which are partially peeled by the mechanical preliminary peeling mechanism 16 to completely peel them off, and the peeled dummy disk 2 is recycled from the peeling position 11f. A gas pressure separating mechanism for discharging to the box 18, 19 is a charge-eliminating / cleaning mechanism for removing charged charges and dust of the disc at the charge-eliminating position 11g, and 20 is a protrusion on the inner and outer peripheral edges of the disc substrate 1 due to the adhesive. Then, as described above, the adhesive agent processing mechanism according to the present invention is provided so that the two disk substrates 1 do not interfere with each other as a DVD when they are bonded to each other.

Hereinafter, a specific processing method and configuration by the adhesive processing mechanism 20 will be described with reference to FIGS. 2 to 4. An elevating rod 22 that supports the disk cradle 21 moves the disk cradle 21 up and down through a hole (not shown) in the turntable 11 of FIG. When the turntable stops rotating, the elevating rod 22 is raised by a driving device (not shown) to receive the disc substrate 1 after the dummy disc 2 is peeled off from the turntable, and the disc substrate 1 is lifted to push the pressing member 23. And press it with an appropriate pressure. The pressing member 23 is provided with an annular convex portion 23a having a width on the lower surface thereof, and the annular convex portion 23a uniformly applies pressure to the inner peripheral edge protrusion 3a by the adhesive 3 to crush and flatten it.

Here, the annular convex portion 23 a of the pressing member 23
The lower surface of the disk is a flat annular surface, and its outer diameter is preferably such that it does not contact the innermost pit formed on the disk substrate 1 and the recording film 2b as shown in FIG. Although not shown, the pressing member 23 is supported by a fixing mechanism via a bearing mechanism, and when the lifting rod 22, the disk receiving base 21, and the disk substrate 1 rotate, they follow and rotate.

While the inner peripheral edge projection 3a is being crushed by the adhesive 3, or after that, the cutting blade device 24 is advanced to the left side in the drawing, and the outer peripheral edge projection is formed by the adhesive as described above. 3b is brought into contact with a predetermined pressure. Further, a mouth of a blow nozzle 25 for blowing off the cutting powder or the like is provided in advance in the vicinity of the position where the outer peripheral edge projection 3b and the cutting blade member 24 are in contact with each other. The cutting blade device 24 is, for example, 30
It has a blade with an angle of about 45 to 45 degrees and also has an air suction function. Therefore, since the adhesive powder scraped by the cutting blade is blown off by the low nozzle 25 and sucked from the outer peripheral side of the disk by the suction function of the cutting blade device 24, the adhesive powder does not remain on the disk.

Then, the state as shown in FIG.
That is, while the annular convex portion 23a of the pressing member 23 presses the inner peripheral edge projection 3a by the adhesive 3 and the cutting blade member 24 applies a predetermined pressing force to the outer peripheral edge projection 3b by the adhesive 3, the lifting rod is moved. As the disk 22, the disk pedestal 21, and the disk substrate 1 start to rotate, the pressing member 23 also rotates with them as described above, and along with this, the outer peripheral edge projection 3b by the adhesive 3 causes the cutting blade member 24 to move. Be cut by.

Therefore, as described above, the disk substrate 1
When the cutting edge member 24 removes the outer peripheral edge projection 3b caused by the adhesive 3 by rotating, the pressing member 23 serves to rotate the disk substrate 1 together with the disk pedestal 21 without the disk substrate 1 shifting. The lower surface of the disk is the disk cradle 2
No scratches are caused by 1. Although not shown, the disk pedestal 21 is provided with a plurality of general suction holes, and the disk substrate 1 rotates when the disk pedestal 21 is rotated.
Is adsorbed on.

Although not shown in FIGS. 1 to 3 for the sake of simplicity, the actual disk support 21 is supported by a coil spring 21A having a weak elastic force at the center as shown in FIG. The head member 21B is provided. The head member 21B has a function of correcting the displacement of the disk substrate 1. The head member 21B has a cylindrical appearance, and has a taper portion 21b in which an upper circumferential corner portion is deleted to be inclined. Head member 2
The outer diameter of the cylindrical portion of the external appearance of 1B is slightly larger than the diameter of the central hole 4 of the disk receiving base 21. 2
1C is a suction hole for sucking the disk substrate 1.
Further, the pressing member 23 is preliminarily aligned with the disk receiving base 21 and arranged above it.

In FIG. 4, the disc substrate 1 is placed on a turntable (not shown). When the disk substrate 1 stops at the position shown in the figure due to the stop of the turntable, the disk receiving base 21 starts to move up, receives the disk substrate 1 through the hole in the turntable (not shown), and moves up. At the time of receiving this, the disc substrate 1 is usually slightly displaced, and even if it is displaced, the center pin 21
Since B has the tapered portion 21b, the top of the tapered portion 21b of the center pin 21B enters the central hole 4 of the disc substrate 1, and the tapered portion 21b supports the disc substrate 1. As a result, even if the disc substrate 1 is displaced, the displacement is corrected by sliding on the taper surface of the taper portion 21b, and the coil spring 21A having an elastic force of a size that does not lower the center pin 21B due to the weight of the disc substrate 1. Being supported by the disk support 1, the coil spring 21A contracts due to the suction force of the disk support 21, and the disk substrate 1 comes into close contact with the disk support 21.

That is, as described above, the center pin 21
B has a taper portion 21b and also has a coil spring 21.
Since it is supported by A, the disk substrate 1 is received by the taper portion 21b of the center pin 21B to correct the displacement of the disk substrate 1, and the disk support 2
The suction function of 1 sucks the disk substrate 1,
The coil spring 21A contracts and the lower surface of the disk substrate 1 comes into close contact with the disk receiving base 21. Therefore, the inner peripheral edge projection 3a can be crushed by the adhesive 3 without adversely affecting the disk substrate 1.

By performing such processing, as shown in FIG.
Alternatively, the two processed disk substrates 1 as shown in FIG.
The recording films 2b of the above are adhered to each other via an adhesive to form a DVD-
When 18 is obtained, high quality bonding can be performed.

[0031]

As described above, according to the present invention, it is possible to remove the inner peripheral edge protrusion and the outer peripheral edge protrusion by the adhesive of the disc substrate with a simple mechanism, and it is possible to obtain a high quality DVD-18 type optical disc or the like. Allows pasting.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of an optical disc manufacturing apparatus including an adhesive processing mechanism according to the present invention.

FIG. 2 is a diagram for explaining an embodiment of an adhesive treatment mechanism for an optical disc according to the present invention.

3 is an enlarged view of a portion of FIG. 2. FIG.

4A and 4B are views for explaining the structure and operation of the disk pedestal used in the present invention.

FIG. 5 is a diagram showing peeling of a disk substrate and a dummy disk.

6 is an enlarged view of a portion of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk substrate 2 ... Dummy disk 3 ... Adhesive 4 ... Central hole 10 of disk 10 ... Laminating device 11 ... Turntable 12 ... Disk transfer mechanism 13 ... -Adhesive removal mechanism 14 ... Static elimination / cleaning mechanism 15 ... Inversion mechanism 16 ... Mechanical preliminary stripping mechanism 17 ... Gas pressure stripping mechanism 18 ... Recycle box 19 ... Static elimination / cleaning mechanism 20 ... Adhesive processing mechanism 21 ... Disk support 21A ... Coil spring 21B ... Head part 21C ... Suction hole 22 ... Elevating rod 23 ... Pressing member 23a ... Annular convex part of pressing member 24 ... Cutting blade member 25 ... Air suction mechanism

─────────────────────────────────────────────────── --Continued from the front page (56) References JP 2000-113519 (JP, A) JP 9-245384 (JP, A) JP 9-153234 (JP, A) JP 61-273759 (JP, A) JP-A-60-107747 (JP, A) JP-A-8-124223 (JP, A) JP-A-60-47251 (JP, A) JP-A-61-139957 (JP, A) Kaihei 3-116460 (JP, A) JP 10-112070 (JP, A) JP 9-259466 (JP, A) JP 9-73671 (JP, A) JP 10-116445 ( JP, A) JP-A-2-223030 (JP, A) International Publication 00/18531 (WO, A1) US Patent 5540966 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 7/26

Claims (9)

(57) [Claims] 1. A method of manufacturing an information disc substrate having a first reflection film and a second reflection film for reflecting light, comprising: a disc substrate having information recorded on one side and having the first reflection film. A first step in which information is recorded on one side and a dummy substrate having the second reflective film is attached by an adhesive, and a force is applied between the disk substrate and the dummy substrate each having a central hole. And a second step of peeling and removing the dummy substrate from the second reflective film, and a third step of crushing the inner peripheral edge protrusions formed by the adhesive along the central hole of the disk substrate. A method for producing an information disc, which is characterized by being provided. 2. A method of manufacturing an information disc substrate having a first reflection film and a second reflection film for reflecting light, comprising: a disc substrate having information recorded on one side and having the first reflection film. A first step in which information is recorded on one side and a dummy substrate having the second reflective film is attached by an adhesive, and a force is applied between the disk substrate and the dummy substrate each having a central hole. A second step of peeling and removing the dummy substrate from the second reflective film by means of a mechanical step of removing an outer peripheral edge protrusion by an adhesive formed along the outer peripheral edge of the disk substrate. 3 steps,
A method for producing an information disc, comprising: 3. A method of manufacturing an optical disk, characterized in that the steps of claim 1 and claim 2 are combined. 4. The method according to claim 1, further comprising a step of adhering two disk substrates manufactured by the manufacturing method according to any one of claims 1 to 3 to the respective second reflective layers with an adhesive. Optical disk manufacturing method. 5. A disk substrate manufactured by the manufacturing method according to any one of claims 1 to 3, and a disk substrate on which information is recorded on one surface and one reflective film is formed. A method for manufacturing an optical disc, comprising a step of adhering films to each other via an adhesive. 6. An apparatus for producing an information disc substrate having a first reflection film and a second reflection film for reflecting light, wherein a disc substrate having information recorded on one side and having the first reflection film. A bonding device that records information on one side and bonds the dummy substrate having the second reflective film with an adhesive; and applying force between the disc substrate and the dummy substrate to the second substrate. An optical disk manufacturing apparatus comprising: a peeling unit that peels the dummy substrate from a reflective film; and a pressing mechanism that crushes an inner peripheral edge protrusion formed by the adhesive along a central hole of the disk substrate. . 7. The disk pedestal for receiving the disk substrate after the dummy substrate has been peeled off according to claim 6, wherein the disk pedestal is provided with a head portion at the center thereof which fits into a central hole of the disk substrate, and the head portion is tapered. An apparatus for manufacturing an optical disk, which is provided with a portion and is supported by a coil spring. 8. An apparatus for producing an information disc substrate having a first reflection film and a second reflection film for reflecting light, wherein a disc substrate having information recorded on one side and having the first reflection film. A bonding device that records information on one side and bonds the dummy substrate having the second reflective film with an adhesive, and the disk substrate and the dummy substrate that are bonded from the bonding device, and the disc is received. A pedestal having a means for adsorbing the substrate; a peeling means for peeling the dummy substrate from the second reflective film by applying a force between the disc substrate and the dummy substrate; And a removing mechanism that removes the outer peripheral edge protrusions of the adhesive layer formed by the adhesive by a mechanical force. 9. An apparatus for manufacturing an optical disk, characterized in that the mechanism according to claim 6 or 7 and claim 8 is combined.