JP2000306275A - Method and device for sticking optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stuck disk having fair appearance and uniform in the thickness of the inside part. SOLUTION: Two disks 1 are overlapped by way of a liquid adhesive 2, this liquid adhesive 2 is spread on a prescribed region by the high-speed spinning of the disks 1 and the disks 1 are stuck together. In the high-speed spinning, pressing force in the inward direction of the disks 1 is applied to the liquid adhesive 2 between the disks 1 by applying force which presses the upper disk downward and the liquid adhesive 2 is spread on the prescribed region while preventing the transfer of the surface of the inside part of the liquid adhesive 2 toward the outside by centrifugal force in the high-speed spinning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing one optical disk by bonding two disks to each other among methods and apparatuses for manufacturing an optical disk.

[0002]

2. Description of the Related Art In a conventional optical disk laminating method and apparatus, particularly after laminating disks through a liquid adhesive, when the disk is rotated at a high speed and the adhesive is spread over a predetermined area, a high speed rotation is required. FIG. 11 shows an example of a device that prevents the surface of the inner peripheral portion of the adhesive from being moved to the outer peripheral side by centrifugal force.

A structure of a conventional example will be described with reference to FIG. First, in order to spread the adhesive by centrifugal force, there is a rotation stage 50 for mounting and rotating the disc at a high speed, and a pin-shaped member 51 which fits in the center hole of the disc is provided at the center. A plurality of suction holes 52 are formed on the vertical surface of the pin-shaped member 51 at uniform intervals, and are connected to a vacuum source (not shown) via a flow path 53. A suction hole 54 is provided on a plane of the rotary stage table 50 on which the disk is placed.
Is formed and connected to a vacuum source (not shown). Here, the vacuum source to which the suction hole 54 is connected is often different from the vacuum source to which the flow path 53 is connected. Generally, the vacuum source connected to the flow path 53 has a higher pressure and is close to the atmospheric pressure. .

Next, the operation of the conventional example shown in FIG. 11 will be described. After the two disks 1 to be bonded are placed on the rotary stage 50 in a state of being superimposed via the liquid adhesive 2 by a transport device (not shown), the suction holes 54
, A vacuum source (not shown) is operated, and the lower disk 4 is held by suction. Thereafter, a vacuum source (not shown) connected to the flow path 53 operates to suck the adhesive 2 in the disk inner circumferential direction.

After the surface 6 of the inner peripheral portion of the liquid adhesive 2 reaches a predetermined position, the rotating stage 50 starts rotating at a high speed, and spreads the liquid adhesive 2 to a required range. During this high-speed rotation, the vacuum source (not shown) connected to the flow path 53 continues to operate, preventing the surface 6 from being moved toward the outer periphery of the disk by centrifugal force.

[0006]

However, such a conventional device has the following problems.

When the liquid adhesive 2 used here is applied to the center hole of the disk 1, the size of the center hole becomes smaller than a predetermined size after the adhesive is cured, and the center hole becomes distorted. Even if the adhesive is applied over the entire circumference of the center hole, after the adhesive is cured, the predetermined size of the center hole,
It is impossible to maintain the shape exactly. In such a state, it becomes difficult for the bonded disk to normally read signals by the reading device. Therefore, it is necessary to stop the surface 6 of the inner peripheral portion of the liquid adhesive between the discs at an appropriate position before reaching the center hole, but this has a problem of the conventional one.

In the conventional example, the adhesive between the two disks 1 to be bonded is directly sucked. However, since the gas flows, the suction force acting on the adhesive is applied to the entire surface 6 of the inner peripheral portion. It is difficult to make the entire surface uniform, and the moving speed of the surface 6 tends to vary. In addition, since the moving speed of the surface 6 due to suction is high, it is difficult to stop the surface 6 at an appropriate position while maintaining a clean circular shape as shown in FIG. Appearance tends to be dirty.

In addition, due to the disorder of the shape of the surface 6 at the time of bonding, the thickness of the adhesive layer at the inner peripheral portion of the recording area of the bonded disc is likely to be disordered. This is for example DVD (Digital Versatile Disc)
Of these, a single-sided, dual-layer reading disk leads to a signal reading error, which is a serious problem.

[0010]

Means for Solving the Problems In order to solve this problem, the method according to the present invention employs a liquid adhesive through a liquid adhesive.
After the two disks are superimposed, in a method of laminating the optical disks to rotate the disks at a high speed and spread the liquid adhesive in a predetermined area, when rotating the two disks at a high speed, the upper disk is turned downward. By applying a pushing force, a force is applied to push the liquid adhesive between the disks in the inner circumferential direction of the disks, and the surface of the inner circumferential portion of the liquid adhesive is moved to the outer circumferential side by centrifugal force during high-speed rotation. The present invention proposes a method for bonding optical disks that can be extended to a predetermined inner peripheral area without any problem.

As a second means, in claim 1,
At the time of high-speed rotation of the two disks superimposed via the liquid adhesive, air is sucked from the center hole of the disks through an air inlet smaller than the distance between the disks, whereby the space between the two disks is reduced. The present invention proposes an optical disk bonding method characterized in that the pressure is made lower than the atmospheric pressure and a force is applied to push the upper disk downward.

As a third means, in claim 1 or claim 2, the pressure of a groove space formed between the suction holding surface for sucking and holding the lower disk and the lower disk is reduced by the lower side. The present invention proposes an optical disk laminating method characterized in that the groove space communicates with the atmospheric pressure so that the lower disk hardly lowers from the start of disk suction until the lower disk is held by suction.

[0013] As a fourth means, an optical disk according to any one of claims 1 to 3, wherein a pressure between the two disks is changed in accordance with a change in the number of rotations of the disks. It proposes a bonding method.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the pressure between the two disks is changed by changing the amount of intake air from the intake port. An optical disc bonding method is proposed.

As a sixth means, in claim 5,
An optical disk laminating method characterized by changing the amount of intake air from the intake port according to the disk rotation speed is proposed.

According to a seventh aspect of the present invention, there is provided the optical disk bonding method according to the fifth or sixth aspect, wherein the amount of intake air from the intake port is changed according to the number of rotations of the disk using a venturi effect. Is proposed.

According to an eighth aspect, in any one of the fifth to seventh aspects, the amount of intake air from the intake port is
The present invention proposes an optical disk laminating method characterized by changing the temperature according to a change in the temperature of the adhesive or the ambient temperature.

As a ninth means, in claim 6 or claim 7, the amount of intake from the intake port is changed according to the number of rotations of the disk, and the gradient of the change in the amount of intake or the upper limit value is adhered. The present invention proposes an optical disk laminating method characterized by changing the temperature according to the temperature of the agent or the ambient temperature.

Further, in the apparatus according to the present invention, after the two disks are overlapped with each other via the liquid adhesive, the two disks are sucked and held on a rotating stage and rotated at high speed to remove the liquid adhesive between the disks. In an optical disc bonding apparatus that spreads over a predetermined area, by providing a mechanism that exerts a force that pushes the upper disk downward when rotating the disk at a high speed, the liquid adhesive is moved in the disk inner circumferential direction between the disks. A method of laminating optical disks, wherein a pressing force is applied and a surface of an inner peripheral portion of the liquid adhesive is spread to a predetermined area without being moved in a disk outer peripheral direction by a centrifugal force during high-speed rotation. A device is proposed.

As a second device, an intake port is provided on a side surface of a pin-shaped member that fits into a center hole of two disks superposed via a liquid adhesive in claim 10, and the intake port is rotated at a high speed. The distance between the two disks is smaller than the distance between the two disks, and the disk is located between the two disks before high-speed rotation. An optical disc bonding apparatus characterized in that a pressure between two of said discs is made lower than the atmospheric pressure by an air flow flowing into said intake port from a gap with a member, and a force for pushing said upper disc downward is exerted. Is proposed.

A third device according to claim 10 or 11, wherein a space between the pin-like member that fits in the center hole of the two disks and the rotary stage that sucks and holds the lower disk. Is always connected to the part which is in the atmospheric pressure state by a vent, and the pressure drop of the space due to the vacuum leak generated from the start of the suction of the lower disk to the close contact of the lower disk with the rotating stage, The present invention proposes an optical disk bonding apparatus characterized in that air is prevented from flowing in through a vent hole.

According to a fourth aspect of the present invention, in any one of the tenth to twelfth aspects, a mechanism for changing a pressure between the two disks according to a change in the number of rotations of the disks is provided. The present invention proposes an optical disk laminating apparatus having a feature.

A fifth device according to any one of claims 11 to 13, further comprising a mechanism for changing a pressure between the two disks by changing an amount of intake air from the intake port. The present invention proposes an optical disc bonding apparatus characterized by the following.

As a sixth device, in claim 14, a pipe from the suction port is provided with a voltage control type or current control type vacuum pressure reducing valve, and the set vacuum pressure is changed according to the rotation speed of the disk. The present invention proposes an optical disk laminating apparatus characterized in that the amount of intake air from the intake port is changed according to the number of rotations of the disk.

As a seventh device, in claim 14, a vacuum generator utilizing a venturi action is provided in a pipe from the intake port, and a voltage control type or current control is provided in an air supply pipe to the vacuum generator. An optical disc sticker, comprising a pressure reducing valve of a shape, and changing the set air pressure in accordance with the rotation speed of the disk, thereby changing the amount of intake air from the intake port in accordance with the rotation speed of the disk. It proposes a matching device.

An eighth device according to any one of claims 14 to 16, wherein the amount of intake air from the intake port is changed according to a change in an adhesive temperature or an ambient temperature. It proposes a matching device.

According to a ninth device, in claim 15 or claim 16, the amount of intake from the intake port is changed according to the rotation speed of the disk, and the gradient or upper limit of the change in the amount of intake is adhered. The present invention proposes an optical disk bonding apparatus characterized in that the optical disk bonding apparatus is changed according to the temperature of the agent or the ambient temperature.

[0028]

First, the principle of the present invention will be described. In the present invention, since the liquid adhesive is pressed in the inner circumferential direction of the disk by using a force that pushes the upper disk, to which the atmospheric pressure is bonded, downward, the surface of the inner circumferential portion of the adhesive is pressed. It is easier to move it evenly than when directly sucking it. This is because if the method of reducing the pressure in the space between the two disks bonded together while holding the upper disk by suction is adopted, there is almost no air flow in this space, and the pressure in the space becomes uniform. This is because it is possible to equalize the pressing force of the upper disk in the downward direction.

In addition to the above, there are the following effects. FIG. 1 is a diagram showing the present embodiment, and the detailed operation of FIG. 1 will be described later, and the above operation will be described with reference to FIG. When the pressure in the space inside the liquid adhesive 2 between the two disks 1 to be bonded becomes lower than the atmospheric pressure, the shape of the upper disk 3 of the two disks 1 becomes slightly convex. Therefore, in addition to the fact that the lower disk 4 is sucked and held and is flat, the gap between the two disks 1 becomes narrower toward the inner peripheral portion.

FIG. 4 shows the spread state of the liquid adhesive 2 when viewed from above. Since the surface 5 of the outer peripheral portion of the liquid adhesive 2 is pushed by the upper disk 3 and moves between the disks in the outer peripheral direction of the disk, the thickness of the liquid adhesive 2 decreases with time. Occurs. Due to the synergistic effect of these two actions, the moving speed of the surface 6 of the inner peripheral portion of the liquid adhesive 2 in the inner peripheral direction of the disk gradually decreases with time.

This facilitates stopping the surface 6 of the inner peripheral portion at a predetermined position. Because the moving speed of the surface 6 of the inner peripheral portion gradually becomes slower, a sufficient margin is provided for the timing of starting the high-speed rotation of the disk.
This is because no problem occurs even if the arrival time at the predetermined position slightly fluctuates.

In addition, according to the present invention, a slight vacuum leak at the start of suction holding of the lower disk 4 can suppress the effect of disturbing the pressure in the space between the two disks 1.

In the present invention, the inner peripheral surface 6
According to the centrifugal force acting on the upper disk 3, the downward pressing force by the upper disk 3 can be set, so that the position of the surface 6 of the inner peripheral portion can be stably maintained even during high-speed rotation.

Further, in the present invention, the downward pressing force can be controlled in accordance with a change in the viscosity of the adhesive 2 due to a change in the temperature of the liquid adhesive 2 itself or the surrounding temperature. It can be prevented that the position for stopping the front surface 6 of the vehicle becomes different.

As described above, according to the present invention, the surface of the inner peripheral portion of the liquid adhesive can be relatively accurately stopped at a predetermined position.

Hereinafter, returning to FIG. 1, the first embodiment according to the present invention will be described. First, the configuration of FIG. 1 will be described.
The two disks 1 are maintained in a state where the upper disk 3 and the lower disk 4 are overlapped with the liquid adhesive 2 therebetween. The outer peripheral surface 5 of the liquid adhesive 2 and the inner peripheral surface 6 of the adhesive 2 have a clean circular shape when viewed from above. The two discs 1 to be bonded are mounted on the rotary stage 7 in such a state.

The rotary stage 7 includes a flat portion 8 on which the disk is mounted and a pin-shaped member 9 that fits in the center hole of the disk, and can rotate concentrically with the center of the disk 1 on which the disk is mounted. A suction hole 10 for sucking the lower disk 4 is formed in an inner peripheral portion of the flat portion 8, and is connected to a first vacuum source (not shown). A relief groove 11 is formed outside the suction hole 10, and is formed with an annular projection on the surface of the disk to prevent the disks from sticking together when the disks are accumulated and stored. In many cases, to prevent interference with it. A vent hole 12 is formed in the escape groove 11 to prevent a negative pressure inside the escape groove 11 due to a vacuum leak from the suction hole 10 and prevent the lower disk 4 from sticking to the rotary stage 7.

An escape groove 13 is formed in a portion where the flat portion 8 and the pin-shaped member 9 intersect to escape a burr formed inevitably at the edge of the center hole of the lower disk 4.

The diameter of the pin-shaped member 9 is set to be smaller than the center hole of the disc by about 0.03 mm to 0.1 mm, and a groove-shaped intake port 14 is formed on the end face thereof. Not connected to a second vacuum source. FIG. 2 is a view of the cross section at the position of the intake port 14 as viewed from above. The pin-shaped member 9 is connected to the upper and lower portions by three pillar-shaped support portions at this portion, and otherwise serves as a space. I have.
Therefore, the inlet is open for 360 °,
The channel 15 is also connected with a uniform and sufficient cross-sectional area. The intake port 14 is arranged so as to be narrower than the space between the upper disk 3 and the lower disk 4 stacked via the adhesive 2 before the high-speed rotation, and to be located between the two disks. Is done.

Next, the operation of this embodiment will be described. First,
When the two discs 1 are placed on the rotary stage 7 in a state of being stacked with the adhesive 2 therebetween between them by a transport device (not shown), the first vacuum source (not shown) is operated, and the suction is performed. The pressure in the hole 10 is reduced, and the lower disk 4 is fixed by suction.

Next, a second vacuum source (not shown) is operated, and air is sucked in from the intake port 14 through the flow path 15.
At this time, the pressure in the space 17 surrounded by the liquid adhesive 2, the upper disk 3, the lower disk 4, and the pin-shaped member 9 becomes lower than the atmospheric pressure, and a force to push the upper disk 3 downward is generated. FIG. 3 is an enlarged view of the pin-shaped member at this time. At this time, the liquid adhesive 2
Does not spread immediately due to its viscosity, so that the upper disk 3 becomes slightly convex downward with the adhesive 2 as a fulcrum.

FIG. 4 shows a state in which the adhesive 2 is pushed by the upper disk 3 and spreads in the above state, as viewed from above. Since the adhesive is pushed on the disk surface, the adhesive 2 spreads also in the disk outer peripheral direction. Also, as described above, since the upper disk 3 has a slightly downwardly convex shape,
As described above, the moving speed of the surface 6 of the inner peripheral portion of the adhesive 2 becomes slow over time. When the surface 6 of the inner peripheral portion reaches a predetermined position, the rotating stage 7 starts rotating at a high speed, and the adhesive 2 spreads over the entire predetermined region on the disk. As the speed decreases over time, a sufficient margin can be obtained for the start timing of the high-speed rotation.

Next, FIG. 5 shows a second embodiment of the rotary stage 20. FIG. 5 is a diagram showing only the central portion of the rotary stage 20 for simplification and easy viewing, and FIG. 6 shows a cross-sectional structure thereof. In this embodiment, the first type shown in FIG.
In addition to the embodiment described above, a flow path 21 connecting the escape groove 13 and the escape groove 11 is provided, and when the rotation stage 20 starts sucking the lower disk 4, the surface of the lower disk is rotated by the rotation stage 2.
Evacuation groove 1
3 prevents the pressure in 3 from dropping.

FIG. 7 shows a third embodiment of the rotary stage 20. FIG. 7 also shows the rotary stage 22 as in FIG.
FIG. 8 shows only the central portion of FIG. In the third embodiment, similarly to the second embodiment shown in FIG. 5, a flow path 23 connecting the escape groove 13 and the escape groove 11 is provided.
Similar effects are obtained. In the third embodiment, the flow path 23 is sealed with a rubber 24 having a diameter that does not cover the escape groove 11. Therefore, the two disks 1 are placed on the rubber 24 and are suction-held by vacuum suction through the suction holes 11 passing through the rubber 24. Since the rubber 24 has a high coefficient of friction, it is effective in preventing the disk from slipping during high-speed rotation. In the third embodiment,
Due to the thickness of the rubber 24, of the flat portion of the rotary stage 22, the flat portion outside the relief groove 11 becomes lower, so that a gap is formed between the flat portion and the lower surface of the lower disk 4.
The vent 12 in FIG. 1 can be eliminated. The flat portion of the rotary stage 22, which does not contact the lower surface of the lower disk, acts as a drip-proof plate for preventing adhesion of the adhesive droplets splashing during high-speed rotation. This embodiment is effective for a bonded disk having a relatively small warpage, and high-quality bonding can be performed without contacting the recording area. FIG.
The air holes 12 may be provided by bringing all of the flat portions into close contact with the disk surface as described above.

FIG. 9 is a diagram showing an embodiment of the bonding system. The rotary stage 7 includes a spindle 25
, And is rotatably driven by a motor 27 connected via a shaft coupling 26. Around the rotation stage 7, a cup member 28 for collecting the droplets of the adhesive scattered at the time of high-speed rotation is arranged. A sealing mechanism (not shown) is provided inside the spindle 25, and a fixed pipe connected to the flow path of the rotating part is taken out. Specifically, FIG.
A pipe 29 connected to the suction hole 10 is disposed and connected to a first vacuum source (not shown). Further, a pipe 30 connected to the flow path 15 in FIG. 1 is provided. This pipe 30 is connected to a second vacuum source (not shown) via a voltage-controlled vacuum pressure reducing valve 31 in the middle. This voltage control type vacuum pressure reducing valve can change the vacuum pressure on the secondary side according to the input voltage value, and may be a current control type.

Further, a temperature sensor 32 for measuring an ambient temperature is provided near the cup member 28. further,
A temperature sensor 34 for measuring an adhesive temperature is provided in an adhesive pipe of an adhesive ejection device 33 for ejecting the liquid adhesive 2 to the lower disk 4 at a processing stage preceding the rotation stage 7.
Will be equipped. The temperature detection signals of these temperature sensors 32 and 34 are supplied to main controller 37 via converters 35 and 36, respectively.

The main controller 37 sends control signals to the motor controller 38 and the pressure reducing valve controller 39 to determine the number of rotations of the rotary stage 7 according to the value of the temperature detection signal. And the intake air amount from the intake port 14 in FIG. 1 is always controlled to an appropriate value. When the ambient temperature of the above device is stable,
Either or both of the above temperature sensors 32 and 34 may be omitted.

FIG. 10 is a diagram showing another embodiment of the bonding system. In this embodiment, a pipe 30 connected to the flow path 15 in FIG. 1 is connected to a Veturi vacuum generator 40. The venturi-type vacuum generator 40 utilizes the function of reducing the pressure when air flows through the flow path at a high speed.
1 is connected to a compressed air source (not shown), and a voltage-controlled pressure reducing valve 42 is provided in the middle of a pipe 41. Depending on the air pressure input to the vacuum generator 40, the piping 30
Since the inside vacuum pressure can be controlled, the control can be substantially the same as the embodiment shown in FIG. As in the embodiment shown in FIG. 9, the voltage control type pressure reducing valve 42 may be a current control type, and one or both of the temperature sensors 32 and 34 may be omitted. The fifth embodiment shown in FIG. 10 is effective when a plurality of vacuum sources cannot be prepared.

[0049]

As described above, according to the present invention, the adhesive can be spread over a predetermined area while keeping the surface of the inner peripheral portion of the adhesive in a clean circular shape. It is possible to obtain a bonded disc having a uniform thickness at the inner peripheral portion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a first embodiment according to the present invention.

FIG. 2 is a diagram showing a partial structure of a first embodiment according to the present invention.

FIG. 3 is a diagram for explaining the operation of the first embodiment according to the present invention.

FIG. 4 is a diagram for explaining the operation of the first embodiment according to the present invention.

FIG. 5 is a diagram showing a structure of a second embodiment according to the present invention.

FIG. 6 is a diagram showing a structure of a third embodiment according to the present invention.

FIG. 7 is a diagram showing a structure of a fourth embodiment according to the present invention.

FIG. 8 is a diagram showing a structure of a fifth embodiment according to the present invention.

FIG. 9 is a diagram for explaining an embodiment of a disk bonding system according to the present invention.

FIG. 10 is a diagram for explaining another embodiment of the disk bonding system according to the present invention.

FIG. 11 is a diagram illustrating an example of a conventional optical disc bonding apparatus.

FIG. 12 is a diagram for explaining a problem of the conventional example.

[Explanation of symbols]

1 ... two discs to be bonded 2 ...
Liquid adhesive 3 ・ ・ ・ Upper disk 4 ・ ・ ・ Lower disk 5 ・ ・ ・ Surface of adhesive outer peripheral part 6 ・ ・ ・ Surface of adhesive inner peripheral part 7 ・ ・ ・ Rotating stage 8 ・ ・ ・ Planar part 9 ... Pin-shaped member 10 ... Suction hole 11 ... Escape groove 12 ... Vent hole 13 ... Escape groove 14 ... Intake port 15 ... Flow path 16 ... Support part 17 ... space 20 ... rotary stage 21 ... flow path 22 ... rotary stage 23 ... flow path 24 ... rubber 25 ... spindle 26 ... shaft coupling 27 ... motor 28 ... Cup member 29 ... Piping 30 ... Piping 31 ... Voltage control type vacuum pressure reducing valve 32 ... Temperature sensor 33 ... Adhesive discharge device 34 ... Temperature sensor 35 ... Conversion Unit 36 ・ ・ ・ Converter 37 ・ ・ ・ Main control unit 38 ・ ・ ・ Motor control unit Placement 39 ・ ・ ・ Reducing valve control device 40 ・ ・ ・ Venturi type vacuum generator 41 ・ ・ ・ Piping 50 ・ ・ ・ Rotating stage 51 ・ ・ ・ Pin-shaped member 52 ・ ・ ・ Suction hole 53 ・ ・ ・ Flow path 54 ・..Suction holes

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yutaka Matsumoto 1-18-1 Takada, Toshima-ku, Tokyo Origin Electric Co., Ltd. F-term (reference) 4J040 JA01 MB05 NA21 PA25 PA28 PA33 PA35 PB04 PB08 PB11 5D121 AA07 FF01 FF11 FF18

Claims (18)

[Claims] 1. A method for laminating two disks via a liquid adhesive, and then rotating the disks at a high speed to spread the liquid adhesive over a predetermined area. When rotating the disk at a high speed, a force is applied to push the upper disk downward, thereby exerting a force to push the liquid adhesive between the disks in the inner circumferential direction of the disk. An optical disc bonding method capable of spreading a predetermined inner peripheral area without moving the surface of the inner peripheral part of the agent to the outer peripheral side. 2. The method according to claim 1, wherein when the two disks superposed via the liquid adhesive are rotated at a high speed, air is sucked from a center hole of the disks through an air inlet smaller than the distance between the disks. A pressure between the two disks is made lower than the atmospheric pressure, and a force is applied to push the upper disk downward. 3. The suction of the lower disk according to claim 1, wherein a pressure of a groove space formed between the lower disk and the suction holding surface for suction holding the lower disk starts suction of the lower disk. Wherein the groove space communicates with the atmospheric pressure space so that the lower disk hardly drops until the lower disk is sucked and held. 4. The optical disk bonding method according to claim 1, wherein a pressure between the two disks is changed in accordance with a change in the number of rotations of the disks. 5. The method of laminating optical disks according to claim 1, wherein a pressure between the two disks is changed by changing an amount of intake air from the intake port. . 6. The optical disk bonding method according to claim 5, wherein the amount of air taken from the air inlet is changed according to the number of rotations of the disk. 7. The method of laminating optical disks according to claim 5, wherein the amount of intake air from the intake port is changed in accordance with the number of rotations of the disk using a venturi action. 8. The method for bonding optical disks according to claim 5, wherein the amount of intake air from the intake port is changed according to a change in an adhesive temperature or an ambient temperature. 9. The method according to claim 6, wherein the amount of intake air from the intake port is changed in accordance with the number of rotations of the disk, and the gradient of the change in the amount of intake air or the upper limit is set to the temperature or the temperature of the adhesive. An optical disk laminating method characterized by changing according to an ambient temperature. 10. After the two disks are overlapped with each other via a liquid adhesive, the optical disk is adhered and held on a rotating stage and rotated at a high speed to spread the liquid adhesive between the disks to a predetermined area. In the aligning device, by providing a mechanism for exerting a force to push the upper disk downward when rotating the disk at high speed,
A force is applied to push the liquid adhesive between the disks in the inner circumferential direction of the disks, and the surface of the inner circumferential portion of the liquid adhesive is not moved in the outer circumferential direction of the disks by centrifugal force during high-speed rotation. An optical disc bonding apparatus, which is spread over a predetermined area. 11. A suction port is provided on a side surface of a pin-shaped member that fits into a center hole of two disks superposed via a liquid adhesive according to claim 10, wherein the two suction ports are not rotated at high speed. The distance between the two disks is set to be smaller than the distance between the disks and between the two disks before high-speed rotation, and the gap between the inner peripheral surface of the two disks and the pin-shaped member during high-speed rotation An optical disk bonding apparatus characterized in that the pressure between the two disks is made lower than the atmospheric pressure by an airflow flowing from the air disk into the intake port, and a force is applied to push the upper disk downward. 12. The space between the pin-shaped member that fits in the center hole of the two disks and the rotary stage that sucks and holds the lower disk, according to claim 10 or 11, The part in the state is connected by a vent, and a pressure drop in the space due to a vacuum leak that occurs from the start of suction of the lower disk to the close contact of the lower disk with the rotary stage is reduced by air from the vent. An optical disc laminating apparatus characterized in that it is prevented by flowing the optical disc. 13. The optical disk according to claim 10, further comprising a mechanism for changing a pressure between the two disks in accordance with a change in the number of rotations of the disk. Laminating device. 14. A mechanism according to claim 11, further comprising a mechanism for changing a pressure between the two disks by changing an amount of intake air from the intake port. Optical disc bonding device. 15. The method according to claim 14, wherein a voltage control type or a current control type vacuum pressure reducing valve is provided in a pipe from the intake port, and a set vacuum pressure is changed according to a rotation speed of the disk. An optical disk laminating apparatus, wherein an amount of intake air from the intake port is changed according to a rotation speed of the disk. 16. The pressure reducing valve according to claim 14, further comprising a vacuum generator utilizing a Venturi action in a pipe from the intake port, and a voltage control type or a current control type in an air supply pipe to the vacuum generator. An optical disc bonding apparatus, comprising: changing a set air pressure according to a rotation speed of the disk so as to change an intake amount from the intake port according to the rotation speed of the disk. 17. The optical disk bonding apparatus according to claim 14, wherein the amount of air taken from the air inlet is changed according to a change in an adhesive temperature or an ambient temperature. 18. The method according to claim 15, wherein the amount of intake air from the intake port is changed in accordance with the number of rotations of the disk, and a gradient or an upper limit value of the change in the amount of intake air is changed to an adhesive temperature or an ambient temperature. An optical disc laminating apparatus characterized by changing according to temperature.