JP2001256682A - Method for sticking optical disk, and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To circularly form the inner circumferential edge face of an adhesive, which sticks two disks together at a proper position. SOLUTION: When two disks are overlapped by way of a liquid adhesive, and this adhesive is spread over a prescribed region by the high-speed spinning of the disks, the pressure between the disks is made lower than atmospheric pressure, and the high-speed spinning is started while the inner circumferential edge of the liquid adhesive is at the outside of a proper position of the disks, to the extent so as to situate the inner circumferential edge face of the adhesive in a prescribed position. The pressure difference between the pressure between the two disks and atmospheric pressure in the start of the high-speed spinning is kept at a degree such that the inner circumferential edge of the liquid adhesive does not reach the proper position under centrifugal force due to the high- speed spinning or below. During the high-speed spinning, the pressure difference is increased to such a degree, that the inner circumferential edge face of the liquid adhesive moves toward the centers of the disks opposing the centrifugal force. When the inner circumferential edge face of the liquid adhesive reaches the proper position, the high-speed spinning is stopped and the pressure difference is reduced.

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 With respect to a conventional optical disk laminating method and apparatus, in particular, when two disks are superposed via a liquid adhesive and then the disk is rotated at a high speed to spread the adhesive to a predetermined area, the above-mentioned method is used. As a method for preventing the end of the inner peripheral portion of the adhesive from being moved to the outer peripheral side due to centrifugal force at the time of high-speed rotation by lowering the pressure of the space between the disks to below the atmospheric pressure, for example, FIG. There was something like that shown.

The structure of the conventional example will be described with reference to FIG. First, in order to spread the adhesive by centrifugal force, there is a rotary stage 30 for mounting and rotating the disc at high speed, and a pin-shaped member 31 fitted to the center thereof is provided. A plurality of intake ports 32 are formed at a uniform interval on a vertical surface of the pin-shaped member 31, and are connected to a fifth vacuum source (not shown) via a flow path 33. Further, a suction hole 34 is formed in a plane of the rotary stage 30 on which the disk is mounted, and is connected to a sixth vacuum source (not shown). Here, the sixth vacuum source connected to the suction hole 34 is often different from the fifth vacuum source connected to the flow path 33, and generally, the sixth vacuum source connected to the flow path 33 is Has high pressure and is close to atmospheric pressure.

Next, the operation of the conventional example shown in FIG. 8 will be described. After the two disks 1 to be bonded are placed on the rotary stage 30 in a state where they are superposed via the liquid adhesive 2 by a transport device (not shown), the sixth disk (not shown) connected to the suction hole 34 is placed. Is activated, and the lower disk 4 is sucked and held. Thereafter, a fifth vacuum source (not shown) connected to the flow path 33 is operated, and the liquid adhesive 2 is attracted in the disk inner circumferential direction.

After the end surface 21 of the inner peripheral portion of the liquid adhesive 2 reaches a predetermined position, the rotary stage 30 starts rotating at a high speed, and spreads the liquid adhesive 2 to a predetermined range. During this high-speed rotation, the fifth vacuum source (not shown) connected to the flow path 33 continues to operate, thereby preventing the end face 21 from moving toward the disk outer peripheral direction due to centrifugal force.

[0006]

However, in such a conventional device, there is a problem that the liquid adhesive 2 easily or partially or entirely spreads on the center hole of the disk 1. Further, there is a problem that the shape of the end face of the inner peripheral portion of the liquid adhesive 2 is likely to be disturbed even if it does not touch the center hole.

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, it is impossible to accurately maintain the predetermined size and shape of the center hole after the adhesive is cured. 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 liquid adhesive between the disks at an appropriate position before the end face 21 of the inner peripheral portion of the liquid adhesive reaches the center hole of the disk, but this has a problem of the conventional one.

In the conventional example, since the adhesive between the two discs 1 to be bonded is directly sucked, the suction force acting on the adhesive is made uniform over the entire circumference of the end surface 21 of the inner peripheral portion with air flow. It is difficult. Furthermore, since the liquid adhesive is excessive before the high-speed rotation, the thickness is large, and the flow resistance is small. The shape of the end surface 21 is easily collapsed, and it is difficult to keep the distance that the end surface 21 moves during high-speed rotation constant. Therefore, it is difficult to stop the inner peripheral end face 21 at an appropriate position not reaching the center hole while maintaining a clean circular shape, and the appearance of the inner peripheral portion of the bonded discs tends to be dirty.

Further, the thickness of the adhesive layer in the inner peripheral portion of the recording area of the bonded disks tends to be uneven due to the disorder of the shape of the inner peripheral end surface 21 at the time of bonding. This leads to a signal reading error in a single-sided, dual-layer reading disk of a DVD (digital versatile disk), which is a serious problem.

[0010]

In order to solve this problem, according to the first aspect of the present invention, after two disks are overlapped with each other via a liquid adhesive, the disks are rotated at a high speed to form the liquid state. When the adhesive is spread over a predetermined area, the space between the two disks is set to a pressure lower than the atmospheric pressure, and the inner peripheral end surface of the adhesive is formed at a predetermined position. Starts with the inner peripheral end surface of the liquid adhesive outside the proper position of the disk, and at the start of the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure Is maintained at a first value, and during the high-speed rotation, the pressure difference is reduced to the first value.
The second value is larger than the value of the above, the high-speed rotation is terminated when the inner peripheral end surface of the liquid adhesive reaches the appropriate position, and the pressure difference is set to zero or a low value. An object of the present invention is to propose a method of bonding optical disks, which is a feature.

According to the second aspect of the present invention, when the two disks are overlapped via the liquid adhesive and then the disks are rotated at a high speed to spread the liquid adhesive over a predetermined area,
In the method for bonding optical disks, wherein the space between the two disks is set at a pressure lower than the atmospheric pressure and the inner peripheral end surface of the adhesive is formed at a predetermined position, the high-speed rotation is performed on the inner peripheral end surface of the liquid adhesive. Starts at a position outside the proper position of the disk, and at the start of the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure is held at a first value, During the high-speed rotation, the pressure difference is set to a second value larger than the first value, and the pressure difference is maintained even after the high-speed rotation is terminated. The present invention proposes a method for bonding optical disks, wherein the pressure difference is set to zero or a low value when the pressure reaches the appropriate position.

According to the third aspect of the present invention, when two disks are overlapped via the liquid adhesive and then the disks are rotated at a high speed to spread the liquid adhesive over a predetermined area,
In the method for bonding optical disks, wherein the space between the two disks is set at a pressure lower than the atmospheric pressure and the inner peripheral end surface of the adhesive is formed at a predetermined position, the high-speed rotation is performed on the inner peripheral end surface of the liquid adhesive. Starts at a position outside the proper position of the disk, and during the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure is maintained at a first value, and the high-speed rotation Simultaneously with or after the end of the above, the pressure difference to a second value larger than the first value,
The present invention proposes a method for bonding optical disks, wherein the pressure difference is reduced to zero or a low value when the inner peripheral end surface of the liquid adhesive reaches the appropriate position.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the first value of the pressure difference is set such that the first value of the pressure difference is equal to the inner circumference of the liquid adhesive against the centrifugal force caused by the high-speed rotation. The present invention proposes a method for laminating optical disks, characterized in that the end face has a size not smaller than the size that does not move outward in the radial direction, and not larger than the size that does not reach the appropriate position.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the second value of the pressure difference is such that the inner peripheral end surface of the liquid adhesive is opposed to the centrifugal force in the disk center direction. The present invention proposes a method of bonding optical disks, characterized in that the size is small enough to move.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, when the thickness of the inner periphery of the liquid adhesive is reduced to 100 μm or less, the pressure difference is reduced to the first pressure. The present invention proposes a method for bonding optical disks, characterized by switching from the value to the second value.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the first value of the pressure difference is 10
The present invention proposes a method for bonding optical disks, wherein the pressure difference is not more than kPa and the second value of the pressure difference is not less than 5 Pa.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the pressure difference between the pressure in the space between the two disks and the atmospheric pressure fits into the center hole of the disk. An object of the present invention is to provide an optical disk bonding method characterized by being created by sucking air from an intake port of a pin-shaped member.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the pressure difference between the pressure in the space between the two disks and the atmospheric pressure is determined by the center hole of the disk and the pin-shaped member. A method for bonding optical disks, characterized in that the method is created by a high-speed airflow flowing into the intake port from the gap.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects, the pressure in the space between the two disks is changed by changing a flow rate of an airflow from the intake port. An optical disc bonding method characterized by the following is proposed.

According to an eleventh aspect of the present invention, there is provided the optical disk bonding method according to any one of the first to tenth aspects, wherein the airflow from the intake port is generated using a Venturi effect. Things.

In the twelfth aspect of the present invention, when two discs are overlapped via a liquid adhesive and then the disc is rotated at a high speed to spread the liquid adhesive in a predetermined area, the two discs are overlapped. In the optical disc laminating apparatus in which the space between the discs is made lower than the atmospheric pressure and the inner peripheral end face of the adhesive is formed at a predetermined position, the air is sucked into the pin-shaped member fitted into the center hole of the two discs. A mouth is formed, and the pressure of the space between the two disks is made lower than the atmospheric pressure by suction of air therefrom, and the space between the two disks is formed during the high-speed rotation. There is also proposed an optical disc bonding apparatus having a function of changing the pressure difference between the pressure and the atmospheric pressure so as to be larger.

According to a thirteenth aspect of the present invention, in the twelfth aspect, the pressure difference between the pressure in the space between the two disks and the atmospheric pressure is determined by the gap between the center hole of the disk and the pin-shaped member. The present invention proposes an optical disc bonding apparatus characterized in that the apparatus is created by an airflow flowing into the optical disk.

According to a fourteenth aspect of the present invention, in any one of the eleventh to thirteenth aspects, the pressure difference between the pressure of the space between the two disks and the atmospheric pressure is determined by the flow rate of the airflow from the intake port. The present invention proposes an optical disk bonding apparatus characterized in that the optical disk bonding apparatus is changed by changing the optical disk.

According to a fifteenth aspect of the present invention, in any one of the eleventh to fourteenth aspects, two vacuum sources having different pressures are connected to a piping system connected to the intake port via a switching valve. The present invention proposes an optical disk laminating apparatus having a feature.

According to a sixteenth aspect of the present invention, in any one of the eleventh to fourteenth aspects, the piping system connected to the intake port is provided with a voltage control type or current control type vacuum pressure reducing valve. Is proposed.

According to a seventeenth aspect of the present invention, the optical disk according to any one of the eleventh to fourteenth aspects, wherein the piping system connected to the intake port is provided with a vacuum generator utilizing a Venturi effect. The present invention proposes a bonding apparatus.

According to an eighteenth aspect of the present invention, in the sixteenth aspect, two air sources having different pressures are connected to an input air piping system of the vacuum generator utilizing the Venturi action via a switching valve. An optical disc bonding apparatus is proposed.

According to a nineteenth aspect of the present invention, in the sixteenth aspect, the input air piping system of the vacuum generator utilizing the Venturi function is provided with a voltage control type or current control type pressure reducing valve. The present invention proposes a bonding apparatus.

[0029]

Embodiment An embodiment according to the present invention will be described with reference to FIG. First, the configuration will be described. FIG. 1 is a view showing a structure of a rotary stage unit for mounting a disk to be bonded and rotating the disk at a high speed, and shows a state where the disk before high-speed rotation is mounted.

The two discs 1 to be bonded are placed on the flat portion 6 of the rotary stage 5 with the upper disc 3 and the lower disc 4 overlapped with the liquid adhesive 2 therebetween.
It is placed on. A pin-shaped member 7 is formed at the center of the rotary stage 5 so as to fit into the center holes of the two disks 1, and an intake port 8 is formed at a vertical surface thereof.

A suction hole 9 for suction-fixing the lower disk 4 is formed in the flat portion 6 of the rotary stage 5, and relief grooves 10 and 11 are formed. Here, the first relief groove 10 formed in the middle of the plane portion 6 is provided with an annular projection formed on the disk surface so as to prevent the disk from sticking during storage and storage of the disk. The purpose is to prevent trouble in adsorption. The second formed near the pin-shaped member 7
The purpose of the relief groove 11 is to prevent the burrs of the center hole, which are inevitably generated during the molding of the disk, from being applied here so as not to have an adverse effect.

The suction hole 9 is connected to a first vacuum source (not shown), and the suction port 8 is connected to a second or third vacuum source (not shown) via a flow path 12. The rotary stage 5 is rotatably held by a spindle (not shown), and is driven to rotate by a motor (not shown).

FIG. 2 is a diagram showing the entire system to which the embodiment shown in FIG. 1 belongs. The rotary stage 5 is rotatably held by a spindle 13 having a built-in bearing, and is rotationally driven by a motor 15 connected via a shaft coupling 14. Around the rotation stage 5, a cup member 16 that collects adhesive droplets scattered during high-speed rotation is arranged.
A sealing mechanism (not shown) is provided inside the spindle 13, and a fixed pipe connected to the flow path of the rotating part is taken out. Specifically, a pipe 17 connected to the suction hole 9 in FIG. 1 is provided, and connected to a first vacuum source (not shown). Also, a pipe 18 connected to the flow path 12 in FIG.
Is connected to the second and third vacuum sources via the switching valve 19. This switching valve 19 is of a three-position type, and is connected to the piping 18 by an atmospheric pressure release port 20, a connection with a second vacuum source, or a connection with a third vacuum source. You can select the type of status. Note that the pressure of the third vacuum source is lower than the pressure of the second vacuum source, and the pressure difference from the atmospheric pressure is larger.

Next, the operation and effect of this embodiment will be described with reference to FIG. FIG. 3 shows the period from the start to the completion of high-speed rotation.
FIG. 3 is a cross-sectional view showing a state in which a liquid adhesive 2 sandwiched between two disks 1 moves. 3A shows a state immediately after the start of the high-speed rotation, FIG. 3B shows a state at the time when the flow rate of the suction airflow from the intake port 8 changes during the high-speed rotation, and FIG. ing.

In FIG. 3A, the inner disk end faces of the upper disk 3, the lower disk 4, and the liquid adhesive 2 (hereinafter, referred to as the "ends").
The pressure in the space 22 surrounded by the inner peripheral end face 21 and the pin-shaped member 7 is reduced simultaneously with the start of high-speed rotation, and becomes lower than the atmospheric pressure. Returning to FIG. 2 to explain this once,
This state is created when the switching valve 19 is operated and the second vacuum source is connected to the pipe 18.

At this point, since a centrifugal force acts on the liquid adhesive 2, a force to move the inner peripheral end face 21 in the radially outward direction of the disk acts. Position is maintained, or moves slowly inward of the disk. That is, the pressure difference between the atmospheric pressure and the space 22 is set to such a first value X. However, at this time, since the thickness of the liquid adhesive 2 is large, it is difficult to maintain the shape of the inner peripheral end face 21 in a clean circular shape. For example, in the case of a single-sided dual-layer read DVD, the thickness is about 200 to 400 μm. Therefore, warpage that is inevitably present in the upper disk 3 and the lower disk 4 causes variations in the intervals between the gaps. The reason is that the flow resistance when the inner peripheral end face 21 moves varies due to the movement.

At the time point shown in FIG. 3B, the pressure in the space 22 is further reduced, and the difference from the atmospheric pressure becomes larger than that at the time point shown in FIG. Returning to FIG. 2, this state is created by operating the switching valve 19 to connect the pipe 18 to a third vacuum source. By switching the pressure difference to the second value Y larger than the first value X, the inner peripheral end face 21 starts to move in the inner peripheral direction of the disk. Here, since the pressure difference varies depending on the centrifugal force due to the rotation speed of the disk, the viscosity of the liquid adhesive 2, the ambient temperature, and the like, the range cannot be unconditionally determined. Is 10 kPa
Hereinafter, the second value Y is 3 kPa or more. 100 viscosity
For a typical liquid adhesive of -1000 centipoise, the first value X of the pressure difference is in the range of 0.1-10 kPa and the second value Y is in the range of 3-50 kPa. Even in this range, the condition of X <Y must be satisfied.

At this point, the distance between the upper disk 3 and the lower disk 4 is substantially uniform due to the effect of the high-speed rotation. This is because if there is such a variation in the gap as described above and the portion is filled with liquid, the portion with a wide interval is easily flown by centrifugal force, and the thickness decreases greatly with time, while the interval is large. This is because the difference between the wide part and the narrow part rapidly decreases because the thickness of the narrow part is small. Further, since the thickness of the liquid adhesive 2 is thinner than that of FIG. 3A, the influence of the surface tension increases. This means that the thickness of the liquid adhesive 2 is 10
It becomes remarkable when it is reduced to 0 μm or less. For example, in the case of a single-side read DVD, when the thickness is about 50 to 70 μm, a force for making the shape of the inner peripheral end face 21 circular acts strongly. In addition to the fact that the inner peripheral end face 21 itself moves in the inner peripheral direction of the disk, the shape of the inner peripheral end face 21 approaches a circular shape.

At the time of FIG. 3C, the inner peripheral end face 21
Has a beautiful circular shape. Further, since the thickness of the liquid adhesive 2 is small, the inner peripheral end face 21 can be easily stopped at a predetermined position when the high-speed rotation is stopped. For example, in the case of a single-sided read DVD, since the inner peripheral end face 21 has a thickness of about 30 to 40 μm, the flow resistance when the inner peripheral end face 21 moves is large, and the inner peripheral end face 21 moves slowly. That is the reason. By the action as described above, the inner peripheral end face 21
Can be stopped in place in a clean circular state.

FIG. 4 is a view of the state shown in FIG. 3 as viewed from above the disk, and FIGS. 4 (a), 4 (b) and 4 (c) show
3 (a), 3 (b) and 3 (c), respectively.

The example shown in FIGS. 3 and 4 has a gap between the pin-shaped member 7 and the center hole of the disc of 0.01 mm to 0.02 mm, and the air leakage from the gap can be ignored. Has been described. In this case, the low pressure state of the space 22 is created by the suction of air from the intake port 8. Here, even if the distance between the pin-shaped member 7 and the center hole of the disk is 0.03 mm to 0.1 mm and air flows in from the gap, the same effect as described above can be obtained. This is because in the case of the air inflow, the flow velocity of the air flow is high, and a pressure difference is generated between the space 22 and the atmospheric pressure.
Is in a low pressure state. In this case, it is difficult to increase the pressure difference between the pressure in the space 22 and the atmospheric pressure.
There is an advantage that the suction force acting on the inner peripheral end surface 21 can be more easily made uniform than that of directly sucking the suction nozzle 1.

Next, FIG. 5 shows a second embodiment. In this embodiment, a voltage control type vacuum pressure reducing valve 23 is provided in place of the switching valve 19 in the embodiment shown in FIG. 2, a pipe 18 is connected to the secondary side thereof, and the voltage control type vacuum pressure reducing valve 23 is provided.
Is connected to a fourth vacuum source (not shown). The voltage control type vacuum pressure reducing valve 23 is capable of changing the vacuum pressure on the secondary side in accordance with the input voltage value, and may be of a current control type. The pressure of the fourth vacuum source is the same as or lower than that of the third vacuum source shown in FIG. Here, the voltage control type vacuum pressure reducing valve 23 is operated by a control device (not shown), and the operation shown in FIGS. 3 and 4 is generated.

FIG. 6 is a view showing a third embodiment. In this embodiment, a Venturi vacuum generator 24 is arranged in place of the switching valve 19 in the embodiment shown in FIG. 2, a pipe 18 is connected to the secondary side thereof, and a primary side of the Venturi vacuum generator 24 is connected to the primary side. A first compressed air source (not shown) and a second compressed air source (not shown) are connected via a switching valve 25. The venturi-type vacuum generator 24 utilizes the effect of reducing the pressure when air flows through the flow path at high speed. The pressure of the second compressed air source is higher than the pressure of the first air source. Here, the switching valve 25 is operated by a control device (not shown) to generate the suction airflow from the intake port 7 shown in FIG. 3 connected to the pipe 18, and to generate the operation shown in FIGS. 3 and 4.

FIG. 7 is a diagram showing a fourth embodiment. In this embodiment, a voltage control type pressure reducing valve 26 is arranged in place of the switching valve 25 in the embodiment shown in FIG. 6, a pipe 18 is connected to a secondary side thereof, and a primary side of the voltage control type pressure reducing valve 26 is connected to the primary side. A third compressed air source (not shown) is connected. The voltage control type pressure reducing valve 26 can change the air pressure on the secondary side according to the input voltage value, and may be a current control type pressure reducing valve. The pressure of the third compressed air source is the same or higher than the second compressed air source shown in FIG. Here, the voltage control type pressure reducing valve 26 is operated by a control device (not shown) to perform the same function as the embodiment shown in FIG.

In the embodiment described above, the pressure and the atmospheric pressure of the upper disk 3, the lower disk 4, the inner peripheral end surface 21 of the liquid adhesive 2 and the space 22 surrounded by the pin-like member 7 shown in FIG. Although the holding of the pressure difference at the second value is stopped at the same time as the end of the high-speed rotation, it may be held after the end of the high-speed rotation. In this case, the inner peripheral end face 21 of the liquid adhesive 2 at the end of the high-speed rotation is still slightly outward from the appropriate position. Further, in the above-described embodiment, the point of switching from the first value to the second value is performed in the middle of the high-speed rotation. However, the effect of the present invention is similarly obtained even when the high-speed rotation is completed or after that. can get.

In this case, after the high-speed rotation is completed, it takes time to move the inner peripheral end face 21 of the liquid adhesive 2 to an appropriate position in a state where the pressure difference is set to the second value. Since the inner peripheral end surface 21 of the agent 2 is further moving in the proper position direction and the centrifugal force does not work because it is not rotating at a high speed, the object can be achieved in a relatively short time.

[0047]

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

[Brief description of the drawings]

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

FIG. 2 is a diagram showing an entire 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 second embodiment according to the present invention.

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

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

FIG. 8 is a diagram showing an example of a conventional optical disc bonding apparatus.

[Explanation of symbols]

1. Two discs to be bonded 2. Liquid adhesive 3. Upper disc 4. Lower disc 5. Rotary stage 6. Flat part 7. Pin-shaped member 8. Inlet 9・ ・ Suction hole 10 ・ ・ Relief groove 11 ・ ・ Relief groove 12 ・ ・ Flow path 13 ・ ・ Spindle 14 ・ ・ Shaft coupling 15 ・ ・ Motor 16 ・ ・ Cup member 17 ・ ・ Piping 18 ・ ・ Piping 19 ・ ・ Switching valve 20 atmospheric pressure release port 21 inner peripheral end surface of liquid adhesive 22 space 23 voltage-controlled vacuum reducing valve 24 venturi vacuum generator 25 switching valve 26 voltage-controlled Pressure reducing valve 30 ・ ・ Rotating stage 31 ・ ・ Pin-shaped member 32 ・ ・ Inlet port 33 ・ ・ Flow path 34 ・ ・ Suction hole

Claims (19)

[Claims] 1. After two disks are overlapped via a liquid adhesive, when the disks are rotated at a high speed to spread the liquid adhesive in a predetermined area, the space between the two disks is increased. In a method for bonding an optical disk, wherein the space is lower than the atmospheric pressure and the inner peripheral end surface of the adhesive is formed at a predetermined position, the high-speed rotation is such that the inner peripheral end surface of the liquid adhesive is moved from an appropriate position of the disk. At the start of the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure is maintained at a first value, and the pressure difference is maintained during the high-speed rotation. The difference is set to a second value larger than the first value, and the high-speed rotation is terminated when the inner peripheral end surface of the liquid adhesive reaches the appropriate position, and the pressure difference is reduced to zero or low. Value. Bonding method of the disk. 2. After two disks are overlapped with each other via a liquid adhesive, when the disks are rotated at a high speed to spread the liquid adhesive over a predetermined area, the space between the two disks is increased. In a method for bonding an optical disk, wherein the space is lower than the atmospheric pressure and the inner peripheral end surface of the adhesive is formed at a predetermined position, the high-speed rotation is such that the inner peripheral end surface of the liquid adhesive is moved from an appropriate position of the disk. At the start of the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure is maintained at a first value, and the pressure difference is maintained during the high-speed rotation. The difference is set to a second value larger than the first value, the pressure difference is maintained even after the high-speed rotation is terminated, and the inner peripheral end surface of the liquid adhesive reaches the appropriate position. To make the above pressure difference zero or a low value. A method for bonding optical disks, characterized by comprising: 3. When two disks are overlapped with each other via a liquid adhesive, and when the disks are rotated at a high speed to spread the liquid adhesive over a predetermined area, the space between the two disks is increased. In a method for bonding an optical disk, wherein the space is lower than the atmospheric pressure and the inner peripheral end surface of the adhesive is formed at a predetermined position, the high-speed rotation is such that the inner peripheral end surface of the liquid adhesive is moved from an appropriate position of the disk. At the time of the high-speed rotation, the pressure difference between the pressure between the two disks and the atmospheric pressure is maintained at a first value, and simultaneously with or after the end of the high-speed rotation. The pressure difference is set to a second value larger than the first value, and when the inner peripheral end surface of the liquid adhesive reaches the appropriate position, the pressure difference is set to zero or a low value. Characteristic method of bonding optical disks 4. The liquid pressure-sensitive adhesive according to claim 1, wherein the first value of the pressure difference is such that an inner peripheral end face of the liquid adhesive is directed radially outward against centrifugal force caused by the high-speed rotation. A method for bonding optical disks, wherein the size of the optical disc is not less than a size that does not move quickly and is not more than a size that does not reach the appropriate position. 5. The pressure difference according to claim 1, wherein the second value of the pressure difference is such that the inner peripheral end surface of the liquid adhesive moves toward the center of the disk against centrifugal force. A method for bonding optical disks, characterized in that: 6. The pressure difference according to claim 1, wherein when the thickness of the inner periphery of the liquid adhesive is reduced to 100 μm or less, the pressure difference is reduced from the first value to the second pressure.
A method for bonding optical disks, characterized by switching to the value of 7. The optical disk according to claim 1, wherein the first value of the pressure difference is 10 kPa or less, and the second value of the pressure difference is 3 kPa or more. Bonding method. 8. The pin-shaped member according to claim 1, wherein a pressure difference between a pressure in a space between the two disks and an atmospheric pressure is caused by a suction of a pin-shaped member fitted into a center hole of the disk. An optical disc bonding method characterized by being created by sucking air from a mouth. 9. The air intake system according to claim 1, wherein a pressure difference between a pressure in a space between the two disks and an atmospheric pressure is determined by a gap between a disk center hole and the pin-shaped member. An optical disc bonding method characterized by being created by a high-speed airflow flowing into a mouth. 10. The optical disk according to claim 1, wherein a pressure in a space between the two disks is changed by changing a flow rate of an airflow from the intake port. Lamination method. 11. The optical disk bonding method according to claim 1, wherein the airflow from the air inlet is generated using a Venturi effect. 12. After two disks are overlapped with each other via a liquid adhesive, when the disks are rotated at a high speed to spread the liquid adhesive in a predetermined area, the space between the two disks is increased. In an optical disc bonding apparatus for forming a space at a pressure lower than the atmospheric pressure and forming an inner peripheral end face of the adhesive at a predetermined position, an intake port is formed in a pin-shaped member fitted into a center hole of the two discs. The pressure in the space between the two disks is made lower than the atmospheric pressure by suction of air therefrom, and the pressure in the space between the two disks and the atmospheric pressure are reduced during the high-speed rotation. An optical disc bonding apparatus having a function of changing the pressure difference of the optical disk so as to be larger. 13. The air flow flowing into the air inlet through a gap between a center hole of a disk and the pin-shaped member, wherein a pressure difference between a pressure in a space between the two disks and an atmospheric pressure is determined. An optical disc laminating apparatus characterized by being produced. 14. The method according to claim 12, wherein a pressure difference between a pressure in a space between the two disks and an atmospheric pressure is changed by changing a flow rate of an airflow from the intake port. Characteristic optical disc bonding device. 15. The optical disk sticking method according to claim 12, wherein two vacuum sources having different pressures are connected to a piping system connected to the intake port via a switching valve. Matching device. 16. The optical disk bonding method according to claim 12, wherein a voltage control type or a current control type vacuum pressure reducing valve is provided in a piping system connected to the intake port. apparatus. 17. The optical disk bonding apparatus according to claim 12, wherein a vacuum generator utilizing a venturi action is provided in a piping system connected to the intake port. 18. The optical disk bonding method according to claim 16, wherein two air sources having different pressures are connected to an input air piping system of the vacuum generator utilizing the Venturi action via a switching valve. apparatus. 19. The optical disk bonding apparatus according to claim 16, wherein a voltage control type or current control type pressure reducing valve is provided in an input air piping system of the vacuum generator utilizing the Venturi action.