JP2002042386A - Axis alignment method, axis alignment device and disk- manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture high-quality disks aligned in their axial centers with good accuracy, without carrying out complicated preparatory plan works. SOLUTION: The disks 1 are laminated across rigid body disks G on a lifting table 22, disposed liftably at a spindle 21 erected at a base 20 and are subjected to spreading treatment. A tube 43 at the center of the spindle 21 is expanded, by supplying compressed air thereto in carrying out the spreading treatment, by which the spindle bar 41 around the tube 43 is moved outwardly, in the radial direction and the inner peripheral edges of the center holes O of the disks 1 are pressed in the outer peripheral direction. The axis alignment of the disk substrates 1a and 1b which constitute the disks 1 is thus performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axis centering method and an axis centering apparatus for aligning the axis of a disk in which two disk substrates are bonded together with an adhesive, and to bonding these two disk substrates. The present invention relates to a disk manufacturing apparatus for manufacturing one disk.

[0002]

2. Description of the Related Art As is well known, when a digital video / versatile disk, that is, a DVD is manufactured, a method of bonding two disk substrates together using an ultraviolet-curable composition or the like as an adhesive is adopted. ing. The ultraviolet curable composition referred to here includes at least a cationic ultraviolet curable composition and a radical polymerization type ultraviolet curable composition.

[0003] Among these, as a bonding method using a cationic ultraviolet curable composition, a cationic ultraviolet curable composition is dropped toward the surface of one disk substrate, and the cationic ultraviolet curable composition is dropped in the process of dropping. While irradiating the curable composition with ultraviolet light, the cationic ultraviolet curable composition is applied on one disk substrate, and then the other disk substrate is laminated and bonded, and both disk substrates are aligned in the thickness direction. It is pressed so that the ultraviolet-curable composition spreads over the entire area between the disk substrates (this is called "spreading").

Here, the cationic ultraviolet-curable composition is spread by a primary spreading process of pressing a disk on which disk substrates are bonded together from the front and back, and after the primary spreading process, stand up and down. There is a secondary spreading process in which a spindle is provided and inserted through a center hole, and is further laminated by alternately laminating with rigid disks as spacers for a predetermined period of time.

[0005]

By the way, the centering of the two disk substrates constituting the disk is performed between the primary spreading process and the secondary spreading process. In this case, if there is play between the spindle and the center hole of the disk, the cation type ultraviolet curable composition is not completely cured, and the axis of the disk substrates constituting the disk may be shifted. was there. In this case, if the tolerance of the outer diameter of the spindle with respect to the diameter of the center hole of the disk is properly managed, the above-mentioned problem of the axial center deviation can be solved. For example, there is some individual difference between lots depending on the molding machine and the mold to be used, and therefore, it is not always constant. For this reason, it is necessary to perform a complicated operation of replacing the spindle in the secondary spreading process with an appropriate one for each lot of the disk substrate, and in mass production,
There was a problem that the efficiency was extremely low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an axial centering method and an axial centering method capable of manufacturing a high-quality disk with an accurate axial center without performing a complicated setup operation. It is an object to provide a centering device and a disk manufacturing device.

[0007]

According to a first aspect of the present invention, there is provided an axial alignment method, comprising: bonding two disk substrates to each other via an adhesive to form a single disk; Thereafter, a method of aligning the axes of the disk substrates with each other, wherein the expandable spindle is inserted into the center hole of the disk to expand the diameter of the spindle so that the adhesive is in an uncured state. It is characterized in that an inner peripheral edge of a center hole of a certain disk is pressed in an outer peripheral direction, and an axis of disk substrates constituting the disk is aligned.

As described above, the two disk substrates are bonded to each other with an adhesive to form one disk, and the diameter of the spindle inserted through the center hole of the disk is increased so that the inner peripheral edge of the center hole of the disk extends in the outer circumferential direction. , And the axes of the disk substrates are aligned with each other, so that the deviation of the axes can be reliably prevented. Accordingly, the cationic UV curable composition, which starts to be cured by irradiation with ultraviolet rays, is dropped in an annular shape on a single disk substrate, and in the dropping process, curing is started by irradiating ultraviolet rays from the side, and the two In the laminating method of laminating the disk substrates to form one disk, the diameter of the spindle passing through the center hole of the disk is increased while the cationic ultraviolet-curable composition is in an uncured state. It is possible to surely prevent the misalignment of the axes of the substrates and perform good axis alignment. In addition, since the diameter of the spindle is increased, it is not necessary to strictly control the outer diameter tolerance of the spindle with respect to the diameter of the center hole of the disk. For example, individual molding is performed for each lot by a molding machine or a die for molding a disk substrate. Even if a difference occurs, it is not necessary to perform a complicated operation such as replacing the spindle according to the individual difference.

According to a second aspect of the present invention, there is provided an axial centering apparatus for bonding two disk substrates together with an adhesive to form one disk, and thereafter aligning the axial centers of the disk substrates. An apparatus having a spindle that can be inserted into a center hole of the disk, wherein the spindle has an outer diameter that can be expanded, and the spindle is expanded by inserting a center hole of the disk into the spindle. Then, the inner peripheral edge of the center hole of the disc in which the adhesive is in an uncured state is pressed in the outer peripheral direction.

In other words, the diameter of the spindle inserted into the center hole of the disk formed by bonding the two disk substrates with an adhesive can be increased. By pressing the inner peripheral edge in the outer peripheral direction, the axes of the disk substrates can be aligned, and the displacement of the axes can be reliably prevented. In addition, since the diameter of the spindle is increased, it is not necessary to strictly control the tolerance of the outer diameter of the spindle with respect to the diameter of the center hole of the disk, thereby, for example, using a molding machine or a mold for molding a disk substrate. Even if individual differences occur between lots, complicated operations such as replacing spindles in accordance with the individual differences can be eliminated.

According to a third aspect of the present invention, in the second aspect of the present invention, the spindle is provided with:
A plurality of spindle bars along the axial direction are arranged in the circumferential direction, and the diameter is increased by moving these spindle bars radially outward.

That is, by moving the plurality of spindle bars radially outward, it is possible to extremely easily press the inner peripheral edge of the center hole of the disk in the outer peripheral direction and align the axes of the disk substrates.

According to a fourth aspect of the present invention, there is provided an axial centering device according to the third aspect, wherein an outwardly expandable pressing member is provided at the center of the spindle along an axial direction. The spindle bar is arranged on the outer peripheral side of the member, and the spindle bar is pressed outwardly in the radial direction and moved by expanding the pressing member.

As described above, by expanding the pressing member provided at the center of the spindle, the plurality of spindle bars can be moved radially outward so that the inner peripheral edge of the center hole of the disk can be moved in the outer peripheral direction. To align the axes of the disk substrates.

According to a fifth aspect of the present invention, in the axial centering apparatus according to the fourth aspect, the pressing member comprises a tube having elasticity which expands by a fluid pressure.
The tube is arranged along the axial direction.

As described above, by applying the fluid pressure,
Very easily inflating the tube constituting the pressing member,
With this tube, the spindle bar can be moved radially outward without bias, and the inner peripheral edge of the center hole of the disk is pressed in the outer peripheral direction to align the axes of the disk substrates.

According to a sixth aspect of the present invention, in the axial centering apparatus according to the fourth aspect, the pressing member is made of an elastic ball which expands by fluid pressure, and the ball extends along the axial direction. It is characterized by being arranged in a plurality.

That is, by applying a fluid pressure, the plurality of balls constituting the pressing member can be expanded very easily, and the spindle bars can be moved radially outward without bias by these balls, so that the inner peripheral edge of the center hole of the disk can be obtained. Can be pressed in the outer peripheral direction to align the axes of the disk substrates.

According to a seventh aspect of the present invention, there is provided an axis centering apparatus according to any one of the fourth to sixth aspects,
A plurality of windows along the longitudinal direction have a cylindrical tubular body formed at intervals in the circumferential direction, and the spindle bar has a convex cross-sectional shape in which a convex portion is formed on the outer peripheral side, The spindle is pressed radially outward by the expansion of the pressing member, so that the protrusion is disposed in the cylindrical body so that the convex portion fits into the window of the body. The convex portions are projected, and the inner peripheral edge of the center hole of the disk is pressed outward by the convex portions.

That is, by expanding the pressing member, the spindle bar can be pressed very easily radially outward, so that the projection of the spindle bar projects from the window of the cylindrical body.
The protrusions of the spindle bar press the inner peripheral edge of the center hole of the disk in the outer peripheral direction, so that the axes of the disk substrates can be aligned.

According to an eighth aspect of the present invention, there is provided an axis centering apparatus according to any one of the second to seventh aspects,
An elevating table supported so as to be able to move up and down along the spindle is provided, and the disks are stacked on the elevating table via a spacer.

As described above, the disks are stacked on the elevating table which can be moved up and down along the spindle via the spacers. Therefore, by elevating the elevating table according to the number of stacked disks, the number of disks to be stacked can be increased. The upper position can be adjusted, and the supply of the disk by the transfer device or the like can be easily performed.

A disk manufacturing apparatus according to a ninth aspect is a disk manufacturing apparatus in which two disk substrates are bonded to each other by using an ultraviolet-curable composition as an adhesive to form one disk, and at least one of the disk substrates is provided. Coating means for applying the ultraviolet-curable composition in a ring, bonding means for bonding the two disk substrates with the ultraviolet-curable composition in between, and a disk on which the two disk substrates are bonded. An axis alignment processing means for stacking for a predetermined time by the axis alignment apparatus according to claim 8 and expanding the diameter of said spindle to perform axis alignment together with spreading processing of said disk. And

That is, an adhesive made of the ultraviolet-curable composition is applied in a ring shape to at least one of the disk substrates by applying means, and then the disk substrate to which the adhesive has been applied and the other disk substrate are overlapped by the bonding means. And then stick it together to make one disc,
By aligning the disk substrates with each other by inserting the spindle into the center hole of the disk by the axis alignment processing means and expanding the diameter of the spindle, a high-quality alignment of the axes of the disk substrates with high accuracy is achieved. Discs can be manufactured.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an axis centering method, an axis centering apparatus and a disk manufacturing apparatus according to the present invention will be described with reference to a DVD.
The production will be described as an example. FIG. 1 shows a schematic configuration of a DVD manufacturing apparatus. In the figure, reference numeral R1 denotes a disk substrate take-out unit, R2 denotes a disk creation unit, R3 denotes a disk inspection unit,
R4 is a disk payout unit, all of which are housed inside a housing (not shown).

The disk substrate take-out part R1 has a stock area A1 for storing two disk substrates 1a and 1b, which are bonded together to form one disk (DVD), in a state of being separately stacked on the disk holder 2. And a take-out area A2 for taking out the disk substrates 1a and 1b held by the respective disk holders 2 one by one.

The disk creation unit R2 includes a disk substrate 1a
A drop irradiation device (coating means) 3 for dropping the cationic UV-curable composition onto the surface to be bonded and irradiating and applying UV light from the side during the dropping process, and a disc coated with the cationic UV-curable composition Substrate 1a and disk substrate 1
b, a laminating device (laminating means) 4 for laminating one disk 1, a transport device 5 for transporting the disk 1 after lamination, and a cation between the laminated disk substrates 1 a and 1 b. Lamination / end surface treatment device 6 for spreading the ultraviolet curable composition and curing the end surface of the disk 1 after spreading, and the disk 1 after the end surface treatment
From the disk stacking / edge processing unit 6 to the disk inspection unit R
And a transfer device 7 that transfers the data to the disk payout section R4.

The disk inspection unit R3 is constituted by a disk inspection device 8 for inspecting the disk 1 and judging good or bad. It comprises a defective product dispensing section 10 for dispensing a disk 1 determined to be defective.

Next, a process of manufacturing the disk 1 by the DVD manufacturing apparatus configured as described above will be described. First, one disk substrate 1a stacked on the stock area A1 is supplied to the disk producing unit R2. In the stock area A1, a plurality of disk substrates 1a are stacked on the disk holder 2. When the disk holder 2 is moved from the stock area A1 to the take-out area A2, the disk substrates stacked on the disk holder 2 are moved. The uppermost one of the sheets 1a is moved to the substrate supply position B1 of the coating stage B by a conveying means (not shown).

The disk substrate 1a is reversed by the reversing device 11 when the disk substrate 1a is transported to the coating stage B. this is,
In order to prevent foreign matter or the like from adhering to the bonding surface in the previous process, the disk substrate 1 is provided in the stock area A1.
This is because a is stocked with the bonding surface down. The same applies to the other disk substrate 1b.
Inverted by one.

The disk substrate 1a transferred to the substrate supply position B1 is moved to the adhesive application position B2 by rotating the application stage B in the direction of the arrow in the figure. On the bonding surface of the disk substrate 1a transferred to the adhesive application position B2, the cationic ultraviolet curable composition S irradiated with ultraviolet rays falls from the drop irradiation device 3 and is applied in a ring shape.

The disk substrate 1a coated with the cationic ultraviolet curable composition is moved to the substrate transfer position B3 by further rotating the coating stage B in the direction of the arrow in the figure. The disk substrate 1a moved to the substrate transfer position B3 is
It is transported to the bonding device 4 of the bonding stage C by a transporting means (not shown).

At the bonding stage C, there is an extraction area A
2, the disk substrate 1b transported by the transporting means (not shown) has been turned over and is on standby.
a and 1b are laminated by the laminating device 4 with the lamination surfaces facing each other, and laminated together via the cationic ultraviolet curable composition to form one disk 1.

In the disk 1, the thickness of the cationic ultraviolet curable composition forming the adhesive layer is equalized by a rotating device (rotating means) 20 for relatively rotating the disk substrates 1a and 1b, and furthermore by a pressing device 12. After the primary spreading process is performed by being pressed in the thickness direction, the sheet is conveyed by the transfer device 5 to the disk stacking / end surface processing device 6 of the disk stacking / end surface processing stage D. The disc 1 is gripped by the transfer device 5 using a central hole (not shown). At this time, the center centers of the disk substrates 1a and 1b are aligned to perform centering.

The disk lamination / end face processing stage D includes
The disk holders 2 are arranged at equal intervals in the circumferential direction, and the disk 1 is first conveyed onto the disk holder 2 located at the stacking position D1. This disk holder 2
The disk 1 which is successively transported by the transport device 5
Are alternately stacked with the rigid disk G.

A disk holder 2 holding a plurality of disks 1 in a stacked state is a disk stacking / end face processing stage D
Is moved to the spreading position D2 with the rotation of. At the spreading position D2, a plurality of disks 1 are stacked on the disk holder 2 and left for a predetermined period of time to perform a secondary spreading process of the cationic ultraviolet curable composition.

The disk 1 after the secondary spreading process is moved to the transfer position D3 together with the disk holder 2 with the rotation of the disk stacking / end surface processing stage D. At the transfer position D3, the disks 1 stacked on the disk holder 2 are transferred by the transfer arm 13 one by one to the disk holder 2 located at the end face processing position D4 one by one. At the end face processing position D4, every time the disk 1 is transferred, the cationic ultraviolet curable composition protruding from the end face is wiped off.

At the time of wiping, the band-shaped absorber T is held between the roll holding section 14, the guide section 15 and the winding section 16 so as to be able to be wound, and the disc 1 held by the transfer arm 13 is kept. T along the guide portion 15
When pressed once, the cationic UV curable composition protruding from the end face is absorbed and captured by the absorber T.

Subsequently, the discs 1 after the wiping are sequentially stacked on the disc holder 2 located at the end face processing position D4. When the disc 1 is newly placed on the disc holder 2, the spot light source 17 irradiates ultraviolet rays toward the end face thereof, and the disc holder 2 makes one rotation, so that the ultraviolet rays are radiated over the entire end face and the disc Substrate 1
Curing of the cationic ultraviolet curable composition near the end face between a and 1b is promoted.

When all of the disks 1 have been transferred from the transfer position D3 to the end face processing position D4, and all the disks 1 have been wiped, these disks 1 are moved with the rotation of the disk stacking / end face processing stage D. The entire disc holder 2 is moved to the end face heating position D5.
At the end face heating position D5, the cationic ultraviolet curable composition near the end face is heated by the heater 18 to promote curing.

The disk 1 that has been subjected to the end face hardening process is moved to the separation position D6 together with the disk holder 2 as the disk stacking / end face processing stage D rotates. In the transfer device 7,
There are provided three arms 7a, 7b and 7c which are driven in synchronization with each other. The disk 1 held in the disk holder 2 at the separation position D6 is conveyed to the disk inspection device 8 by the arm 7b and the inspection is performed at the same time. The disc 1 which has been finished is returned to the non-defective product delivery section 9 or the defective product delivery section 10 by the arm 7c.
Transported to

When the arms 7b and 7c return, the rigid disk G held by the disk holder 2 at the separation position D6 is conveyed to the stacking position D1 by the arm 7a and successively from the bonding stage C. It is alternately stacked with the disk 1 to be conveyed.

The discs judged to be defective in the disc inspection device 8 are removed from the regular line, and only discs judged to be non-defective are stacked on the disc holder 2 prepared in the non-defective delivery section 9 to hold the disc. The container 2 is transported to the subsequent process.

In the DVD manufacturing apparatus generally constructed as described above, the disk laminating / end surface processing device 6 of the disk laminating / end surface processing stage D for performing secondary spreading of the disk 1 having the disk substrates 1a and 1b bonded thereto. FIG. 2 shows the structure of a disk holder 2 as an axis centering device constituting
Shown in

In the figure, reference numeral 20 denotes a base, reference numeral 21 denotes a spindle erected on the base 20, and reference numeral 22 denotes a lift which moves up and down along the spindle 21. The disk 1 transported first by the transport device 5 is transferred to the disk holder 2 of the disk stacking / end face processing device 6.

At this time, in the disk holder 2,
A rigid disk (spacer) G is already placed on the elevating table 22, and the transported disk 1 is placed on the rigid disk G. Subsequently, after lowering the elevating table 22 until the tip of the spindle 21 protrudes from the disk 1, the next rigid disk G is placed on the disk 1 by the transport device 5.

The rigid disk G used as a spacer as described above is an Al disk having a thickness of 2 mm, and has a ring-shaped groove (not shown) for avoiding interference with the ring-shaped projection of the disk 1. . The outer diameter of the rigid disk G is set smaller than the outer diameter of the disk 1. This is to prevent burrs due to injection molding from occurring on the outer peripheral edges of the disk substrates 1a and 1b constituting the disk 1, and to avoid interference between the burrs and the rigid disk G.

When the disk 1 and the rigid disk G are stacked on the disk holder 2 by a predetermined amount by the above-described transport device 5, the disk stacking / end face processing device 6 changes the stacking state of the disk holder 2 for a predetermined time. Let it pass.
This ensures that the cationic ultraviolet curable resin is spread on the disk 1. Subsequently, the disk laminating / edge processing device 6 moves the disk holder 2 on which the disk 1 is mounted, and at the above-described edge processing position D4, the cationic ultraviolet curable composition protruding from the edge is wiped off.

Next, a more specific structure of the disk holder 2 will be described. The base 20 of the disk holder 2 is provided with a spindle support 31 for supporting the spindle 21. As shown in FIG. 3, the spindle support 31 has a plurality of slide members 32 provided at equal intervals in the circumferential direction. Here, three slide members 32 are provided.

The slide member 32 includes a slide portion 33 slidably supported in a radial direction and a slide portion 33.
Urging member 34 composed of a compression spring for urging the inward in the radial direction
have. The slide portion 3 of these slide members 32
Spindle bars 41 are provided upright at the inner peripheral end of the spindle 3, and the spindle bars 41 constitute the spindle 21. The spindle bar 41 has an elastic urging ring 42 wound around the upper end thereof.

As a result, the spindle bar 41
It is urged radially inward by an urging ring 42 and an urging member 34 for urging the slide portion 33 of the slide member 32. An elastic tube (pressing member) 43 is disposed at the center of the spindle 21 composed of the spindle bars 41. The tube 43 is made of, for example, a synthetic resin such as soft nylon or silicone, and has a cap 44 fitted at its upper end and hermetically sealed.

The lower end of the tube 43 communicates with a supply path 45 formed in the base 20. A compressed air source 47 is connected to the supply path 45 via a control valve 46, and compressed air sent from the compressed air source 47 is supplied to the tube 43 via the supply path 45,
Thereby, the tube 43 expands to the outer periphery. When the tube 43 expands to the outer periphery in this manner, each spindle bar 41 moves radially outward against the urging force of the urging ring 42 and the urging member 34 with the expansion of the tube 43. It has become.

When the disks 1 are stacked on the disk holder 2, first, the supply of air to the tube 43 is released, that is, the spindle 21 is urged radially inward to reduce the diameter of the spindle 21. In this state, the disk 1 on which the disk substrates 1a and 1b are bonded is placed on the rigid disk G on the lifting table 22 with the center hole O inserted through the spindle 21. The rigid disk G is laminated.

Next, the compressed air from the compressed air source 47 is
The tube 43 is fed into the tube 43 via the supply path 45, whereby the tube 43 is expanded, and the spindle bar 41 is slid outward against the urging force of the urging ring 42 and the urging member 34 to expand the diameter. . By doing so, the inner peripheral edge of the center hole O of the disk 1 is pressed from the inner peripheral side by the spindle bar 41, whereby the axes of the disk substrates 1a and 1b constituting the disk 1 are aligned.

Thereafter, the above operation is repeated, a plurality of disks 1 are stacked together with the rigid disks G, the spreading process is performed, and the spindle 21 is aligned with the center.

As described above, according to the disk holder 2 which is the axis centering device having the above structure, the two disk substrates 1
Since the spindle 21 inserted into the center hole O of the disc 1 formed by laminating a and 1b with an adhesive made of a cationic ultraviolet curable composition can be expanded in diameter,
When the disks 1 are stacked via the rigid disk G and spread, the diameter of the spindle 21 is increased.
By pressing the inner peripheral edge of the center hole O of the disk 1 in the outer peripheral direction,
The axes of the disk substrates 1a and 1b can be aligned with each other, and the deviation of the axes during the spreading process can be reliably prevented.

Further, since the diameter of the spindle 21 is enlarged, it is not necessary to strictly control the tolerance of the outer diameter of the spindle 21 with respect to the diameter of the center hole O of the disk 1, whereby, for example, the disk substrate 1a, Even if individual differences occur between lots due to a molding machine or a mold for molding 1b, it is possible to eliminate the need for complicated work such as replacing spindles in accordance with the individual differences. In addition, by moving the plurality of spindle bars 41 radially outward, the inner peripheral edge of the center hole O of the disk 1 can be pressed very easily in the outer peripheral direction to align the axes of the disk substrates 1a and 1b. Can be.

Also, by applying air pressure to the tube 43, which is a pressing member provided at the center of the spindle 21, by applying air pressure, the plurality of spindle bars 4 can be extremely easily.
1 is moved radially outward, and the inner peripheral edge of the center hole O of the disk 1 is pressed in the outer peripheral direction.
The axes of each other can be aligned.

Further, since the disks 1 are stacked on the elevating table 22 which can be moved up and down along the spindle 21 via the rigid disk G, the elevating table 22 is moved up and down according to the number of stacked disks 1. The upper position of the disks 1 to be stacked can be adjusted, and the supply of the disks 1 by the transport device 5 can be easily performed.

According to the disk manufacturing apparatus provided with the axis aligning device including the disk holder 2, the adhesive made of the ultraviolet curable composition is annularly applied to one disk substrate 1a by the drop irradiation device 3. And then apply
The disc substrate 1a to which the adhesive has been applied by the bonding device 4 and the other disk substrate 1b are superimposed and bonded to form a single disk 1. Further, the disk holder 2 moves the disk substrate 1 to the central hole O of the disk 1. The lamination is performed for a predetermined time via the rigid disk G while the spindle 21 is inserted, the spreading process is performed, and the diameter of the spindle 21 is increased to align the axes of the disk substrates 1a and 1b. A high-quality disc 1 whose axis is aligned with high precision can be manufactured.

FIG. 4 shows a disk holder 2A as an axial alignment device having another structure. The disk holder 2A has a structure in which the spindle 21 has a cylindrical body 51 formed in a cylindrical shape, and a tube 43 is inserted through the center of the cylindrical body 51 as shown in FIG. It has been. The cylindrical body 51 has a plurality of windows 5 extending in the longitudinal direction.
2 are formed at equal intervals in the circumferential direction.

A long spindle bar 53 is provided inside the cylindrical body 51. Each of the spindle bars 53 has a convex section 53a with a convex portion 53a formed on the outer peripheral surface side. The convex portion 53a on the outer peripheral surface side is fitted into the window 52. The spindle 21 is provided with a groove 54 extending in the circumferential direction at an intermediate portion thereof, and the groove 54 is provided with an elastic ring 55 made of a spring or the like. And this elastic ring 5
5, the respective spindle bars 53 are urged inward.

When the disks 1 are stacked on the disk holder 2A, first, the supply of air to the tube 43 is released, that is, the spindle bar 53 is urged radially inward by the elastic ring 55. Disk 1 with disk substrates 1a and 1b bonded together
Is placed on the rigid disk G on the lifting platform 22 by passing the center hole O through the spindle 21, and the rigid disk G is stacked on the disk 1.

Next, the compressed air from the compressed air source 47 is
The tube 43 is fed into the tube 43 through the supply path 45, whereby the tube 43 is expanded and the spindle bar 53 is pressed outward against the urging force of the urging ring 55. By doing so, the projections 53 of these spindle bars 53
A part of “a” slightly protrudes from the window 52 of the cylindrical body 51 to the outer peripheral side.

Thus, the inner peripheral edge of the center hole O of the disk 1 is formed by the projections 53a of the spindle bar 53.
The disc is pressed from the inner peripheral side, whereby the disc substrates 1a and 1b constituting the disc 1 are aligned with each other. Thereafter, the above operation is repeated, the plurality of disks 1 are stacked together with the rigid disks G, the spreading process is performed, and the spindle 21 is aligned with the axis.

Also, in the case of the disk holder 2A, similarly to the disk holder 2, the tube 43 is expanded so that the spindle bar 53 can be pressed very easily outward in the radial direction, and Convex part 53a
Are projected from the window 52 of the cylindrical body 51, and the projection 53 a of the spindle bar 53 presses the inner peripheral edge of the center hole O of the disk 1 in the outer peripheral direction so that the axes of the disk substrates 1 can be aligned. .

In the above example, the tube 43 is used as the pressing member, which expands over its entire length when air pressure is applied.
It is not limited to three.

Here, an example in which another member is used as the pressing member will be described. FIG. 6 shows a disk holder 2B having a spindle 21 having another structure.

As shown in FIG. 7, the spindle 21 constituting the disk holder 2B has three spindle bars 61 supported so as to be slidable in the radial direction, and an inner peripheral side of the spindle bars 61. The plurality of air balls 62 provided at intervals in the vertical direction and the adjacent spindle bars 51 are connected to each other.
And a plurality of urging members 63 that attract the members 1 to each other. Compressed air from a compressed air source 47 is supplied to each of the air balls 62 used as a pressing member constituting the spindle 21, and each of the air balls 62 expands.

When the disks 1 are stacked on the disk holder 2B, first, the supply of air to the air balls 62 is released, that is, the spindle bars 61 are attracted to each other by the elastic members 63, and The disk 1 with the disk substrates 1a and 1b bonded together is biased toward the
To be mounted on the rigid disk G on the elevating table 22, and the rigid disk G is stacked on the disk 1.

Next, the compressed air from the compressed air source 47 is
The air is fed into the air ball 62 through the supply path 45, and the air ball 62 is inflated to press the spindle bar 61 outward against the urging force of the urging member 63.

In this manner, the spindle bars 61 are respectively slid outwardly against the urging force of the urging member 63. As a result, the inner peripheral edge of the center hole O of the disk 1 is pressed from the inner peripheral side by the spindle bar 61, whereby the axes of the disk substrates 1a and 1b constituting the disk 1 are aligned.

Thereafter, the above operation is repeated, a plurality of disks 1 are stacked together with the rigid disks G to perform the spreading process, and the spindle 21 is aligned with the axis.

In FIG. 8, the shape of the spindle bar 61 is such that the inner peripheral side is formed in an arc shape in conformity with the outer surface of the air ball 62, and the outer peripheral side is circular in conformity with the center hole O of the disk 1. By using this spindle bar 61, the force of the inflating air ball 62 can be reliably and without difficulty applied to the center hole O of the disk 1.
To the inner peripheral edge of the shaft for good axis alignment.

In the present embodiment, an example is shown in which a cationic UV curable composition is used as an adhesive, but for example, a radical polymerization type UV curable composition may be employed. The irradiation of the radical-polymerizable ultraviolet-curable composition with ultraviolet light is performed after the radical-polymerizable ultraviolet-curable composition is applied to the disk substrate 1a or after the disk substrates 1a and 1b are overlaid and rotated and spread. Become.

[0076]

As described above, according to the present invention,
When two disk substrates are bonded to each other with an adhesive to form a single disk, displacement of the axis can be reliably prevented. Further, it is possible to eliminate the need for complicated work such as replacing the spindle according to the individual difference of the disk substrate.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment according to the present invention, and is a plan view schematically showing a configuration of a disk manufacturing apparatus.

FIG. 2 is a cross-sectional view of the disk holder illustrating a configuration and a structure of a disk holder as a shaft centering device provided in the disk manufacturing apparatus.

FIG. 3 is a sectional view of a spindle illustrating a configuration and a structure of a disk holder provided in the disk manufacturing apparatus.

FIG. 4 is a cross-sectional view of the disk holder for explaining the configuration and structure of another disk holder provided in the disk manufacturing apparatus.

FIG. 5 is a sectional view of a spindle illustrating a configuration and a structure of another disk holder provided in the disk manufacturing apparatus.

FIG. 6 is a cross-sectional view of the disk holder for explaining the configuration and structure of another disk holder provided in the disk manufacturing apparatus.

FIG. 7 is a sectional view of a spindle illustrating a configuration and a structure of another disk holder provided in the disk manufacturing apparatus.

FIG. 8 is a sectional view of a spindle for explaining the configuration and structure of another disk holder provided in the disk manufacturing apparatus.

[Explanation of symbols]

 Reference Signs List 1 disk 1a, 1b disk substrate 2 disk holder (axis centering device) 3 drop irradiation device (coating device) 4 bonding device (bonding device) 21 spindle 22 elevating table 41, 53, 61 spindle bar 43 tube (pressing) Member) 51 Cylindrical body 52 Window 53a Convex part 62 Air ball (pressing member) G Rigid disk (spacer) O Center hole

Claims (9)

[Claims] 1. An axial centering method for bonding two disk substrates to each other via an adhesive to form one disk, and thereafter aligning the axis of the disk substrates with each other, comprising: By inserting a spindle whose diameter can be expanded into the hole and expanding the spindle, the inner peripheral edge of the center hole of the disk in which the adhesive is in an uncured state is pressed in the outer peripheral direction, and a disk substrate constituting the disk is formed. An axis centering method characterized by aligning axes of each other. 2. An axis centering device for bonding two disk substrates to each other via an adhesive to form one disk, and thereafter aligning the axes of the disk substrates, wherein: Has a spindle that can be inserted into the hole,
The spindle has an outer diameter that can be increased, and the center hole of the disk is inserted into the spindle to expand the spindle, thereby forming an inner peripheral edge of the center hole of the disk where the adhesive is in an uncured state. An axial centering device characterized by pressing in an outer peripheral direction. 3. The spindle according to claim 1, wherein a plurality of spindle bars along an axial direction are arranged in a circumferential direction, and the diameter of the spindle bar is increased by moving the spindle bars radially outward. 3. The shaft centering device according to claim 2, wherein: 4. A pressing member, which can expand outward, is provided in the center of the spindle along the axial direction, and the spindle bar is arranged on the outer peripheral side of the pressing member, and the pressing member is expanded. The spindle bar is thereby moved by being pressed radially outward.
The centering device described. 5. The centering device according to claim 4, wherein the pressing member is formed of a tube having elasticity which expands by a fluid pressure, and the tube is disposed along an axial direction. . 6. The axial centering device according to claim 4, wherein the pressing member is made of an elastic ball which expands by a fluid pressure, and a plurality of the balls are arranged along the axial direction. . 7. A plurality of windows extending in a longitudinal direction have a cylindrical tubular body formed at intervals in a circumferential direction, and the spindle bar has a convex sectional shape having a convex portion formed on an outer peripheral side. The cylindrical member is disposed in the cylindrical body so that the convex portion is fitted into the window of the cylindrical body, and the spindle bar is pressed radially outward by the expansion of the pressing member. The shaft center according to any one of claims 4 to 6, wherein the projections protrude from a window of the body, and the projections press an inner peripheral edge of a center hole of the disk in an outer peripheral direction. Matching device. 8. The apparatus according to claim 2, further comprising a lifting platform supported so as to be able to move up and down along the spindle, and wherein the disks are stacked via spacers on the lifting platform. 2. The shaft centering device according to claim 1. 9. A disk manufacturing apparatus in which two disk substrates are bonded to each other using an ultraviolet-curable composition as an adhesive to form one disk, wherein the ultraviolet-curable composition is applied to at least one of the disk substrates. 9. The axial center according to claim 8, wherein: an applying means for applying in an annular shape; a bonding means for bonding the two disk substrates with the ultraviolet-curable composition in between; and a disk on which the two disk substrates are bonded. A disk manufacturing apparatus, comprising: an axis aligning means for performing laminating by a aligning apparatus for a predetermined time and expanding the diameter of the spindle so as to perform axis aligning together with spreading processing of the disk.