JP2001271039A - Bonding method, method and apparatus for producing disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing disks designed to raise the productivity thereof through promoting the curing of an ultraviolet-curable composition exposed on the edge face of the disks. SOLUTION: This method for producing disks comprises the following practice: in an apparatus for mutually laminating disk substrates 1a and 1b each coated with a cationic ultraviolet-curable composition to produce a disk 1, there is provided a light-emitting unit 29 for spot ultraviolet irradiation against the edge face of a disk 1 and the edge face of the disk 1 freed from the above composition by wiping it off is focusedly irradiated with ultraviolet rays; thereby even after the composition is wiped off, the composition exposed on the edge face of the disk 1 is promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding method for bonding two objects using a cationic ultraviolet curable composition as an adhesive.

[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. There is a method in which, while irradiating the curable composition with ultraviolet rays, the cationic ultraviolet curable composition is applied onto one disk substrate, and then the other disk substrate is overlaid and bonded.

[0004]

When the disk substrates are bonded to each other, the cationic ultraviolet curable composition may protrude from the end face of the disk. The protruding cationic UV curable composition tends to have less reactive species implanted by UV irradiation, and the curing is slower than that between the disk substrates, and the transition to the subsequent processing step is difficult. It is causing delay.

[0005] In some cases, the cationic UV curable composition protruding from the end face of the disk is liable to be hardened as a lump, which may impair the aesthetic appearance of the product.

The present invention has been made in view of the above circumstances, and in the invention according to the first aspect, the curing of the cationic ultraviolet curable composition exposed on the end face of the disk is promoted and the transition to the subsequent stage is promoted. It is another object of the present invention to speed up the productivity and further improve the aesthetic appearance of the disc.

[0007]

In order to solve the above-mentioned problems, the present inventor proposes to employ the following means. That is, the bonding method according to the present invention is a bonding method in which two objects are bonded together using a cationic ultraviolet-curable composition as an adhesive, and the cationic ultraviolet-curable composition applied to one of the objects. UV light is applied, and the one object and the other object are bonded together with the cationic UV curable composition irradiated with the ultraviolet light interposed therebetween, and the cations exposed from between the objects after bonding are bonded. The method is characterized in that spot-irradiation is performed on the ultraviolet curable composition.

[0008] The disk manufacturing method according to the present invention includes:
A method for producing a disk by bonding two disk substrates together using a cationic ultraviolet-curable composition as an adhesive, wherein the cationic ultraviolet-curable composition applied to one disk substrate UV light is applied, and the one disk substrate and the other disk substrate are bonded together with the cationic UV curable composition irradiated with the ultraviolet light interposed therebetween, and the cation exposed from between the disk substrates after bonding. The method is characterized in that spot-irradiation is performed on the ultraviolet curable composition.

According to the present invention, the cationic UV-curable composition exposed from the space between the disk substrates after bonding is spot-irradiated with ultraviolet rays, so that the reactive species are implanted in the cationic UV-curable composition. As the curing is accelerated, the time until the disk is sent to the subsequent processing step (that is, the time for waiting for curing of the cationic ultraviolet curable composition) can be shortened.

The above disk manufacturing method can be implemented by a disk manufacturing apparatus having the following configuration. That is, the disk manufacturing apparatus according to the present invention is a disk manufacturing apparatus that combines two disk substrates into a single disk by bonding a cationic ultraviolet curable composition as an adhesive,
An ultraviolet irradiation means for spot-irradiating the cationic ultraviolet-curable composition exposed from between the disk substrates after bonding with ultraviolet rays is provided. The ultraviolet irradiation means used for this spot irradiation may be used at the time of bonding or another means.

In the disk manufacturing apparatus according to the present invention, the ultraviolet light irradiating means may include a light source, an optical fiber cable for guiding ultraviolet light emitted from the light source, and an ultraviolet light guided by the optical fiber cable between the disk substrate. And a light-emitting portion for irradiating the cationic UV-curable composition with spots exposed from a light source. This is also desirable in that the temperature of the disk that gives rise to hardly rises. Optical fiber has
In the process of guiding light, it has the property of narrowing down to an extremely small diameter equal to its own diameter. Therefore, if the ultraviolet light collected by the lighting unit is guided through the optical fiber cable, the output per unit light emitting area of the ultraviolet light emitted from the light emitting unit can be increased even if the ultraviolet light collected by the lighting unit is not so strong. it can. Irrespective of whether or not the cationic ultraviolet curable composition is exposed from the end face of the disk, spot irradiation with ultraviolet light is an effective means. This is because the composition can be expected to accelerate in the vicinity of the portion between the exposed portion and the disk substrate (end face) when exposed, and in the vicinity of the space between the disk substrates (end face) when not exposed.

The disk manufacturing apparatus according to the present invention may further include a wiping unit for wiping the cationic ultraviolet curable composition exposed from between the disk substrates before irradiating the ultraviolet light to between the disk substrates. desirable. By wiping the cationic UV-curable composition exposed from between the disc substrates, it is possible to prevent the formation of the lumps of the cationic UV-curable composition on the end face of the disc, thereby allowing a subsequent processing step to be performed. Not only can the transition time be shortened, but also the aesthetic appearance of the disc can be enhanced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of a DVD manufacturing apparatus. In the drawing, reference numeral R1 denotes a disk substrate take-out unit, R2 denotes a disk creation unit, R3 denotes a disk inspection unit, and R
Numeral 4 denotes a disk payout section, all of which are housed inside a casing (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 each disk holder 2 one by one.

The disc creation unit R2 includes a disc substrate 1a
A drop irradiation device 3 for dropping and applying the cationic ultraviolet curable composition to the bonding surface of the above, and a bonding device 4 for bonding the disk substrate 1a and the disk substrate 1b coated with the cationic ultraviolet curable composition. And a transport device 5 for transporting the bonded disks 1, and a disk laminating / stacking device that spreads the cationic ultraviolet curable composition between the bonded disks 1 and then performs an end surface hardening process on the disks 1.
The disk processing unit R3, the disk inspection unit R3, and the disk unloading unit R4.
And a transfer device 7 that transfers the data to the server.

The disk inspection unit R3 is composed of a disk inspection device 8 for inspecting the disk 1 and determining good / bad. The disc dispensing unit R4 includes a non-defective product dispensing unit 9 for dispensing a disc 1 determined to be non-defective and a defective product dispensing unit 10 for dispensing a disc 1 determined to be defective.

Next, a description will be given of a disk manufacturing process by the DVD manufacturing apparatus configured as described above. 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. 1a
The uppermost one of them is transferred to the substrate supply position B1 of the application stage B by a transport means (not shown).

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 on which the cationic ultraviolet curable composition has been applied is moved to the substrate transfer position B3 by further rotating the application 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 other disk substrate 1b transported by the transport means (not shown) is on standby, and the disk substrates 1a, 1
b is laminated by the laminating device 4 with the lamination surfaces facing each other, and laminated via the cationic ultraviolet curable composition.

The disk 1 on which the disk substrates 1a and 1b are bonded is once moved to the pressing portion 12 and pressed in the thickness direction, and then the disk laminating / end surface processing device of the disk laminating / end surface processing stage D is carried by the transport device 5. 6. At this time, the disk 1 is gripped by the transport device 5 using a central hole (not shown).
The axes are aligned by aligning the centers of a and 1b.

In the disk lamination / end face processing stage D,
The disk holders 2 are provided 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 provided with 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 left standing for a predetermined time in a state of being stacked on the disk holder 2, and the cationic ultraviolet curable composition is spread.

The disk 1 after the 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. Transfer position D3
In, the disks 1 stacked on the disk holder 2 are transferred one by one to the disk holder 2 located at the end face processing position D4 from the upper one by the transfer arm 13. 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.

When all 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
Is moved to the end face heating position D5 together with the disc holder 2 with the rotation of the disc stacking / end face processing stage D. At the end face heating position D5, the heater 14 heats the cationic ultraviolet curable composition near the end face between the disk substrates to promote curing. In the present invention, by wiping the cationic-type ultraviolet-curable composition exposed on the end face of the disk and then irradiating the spot with ultraviolet light, it is possible to quickly shift to the subsequent processing step, and the end face is more beautiful. However, it is preferable to further heat the end face so that the cationic ultraviolet curable composition in the vicinity of the end face between the disk substrates 1a and 1b is more reliably cured.

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 transferred to the stacking position D1 by the arm 7a, and is transferred from the bonding stage C one after another. The disk 1 and the disk 1 are alternately stacked.

The discs judged to be defective in the disc inspection device 7 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 next process.

In the DVD manufacturing apparatus generally constructed as described above, the drop irradiation device 3 for irradiating the cationic ultraviolet curable composition with ultraviolet rays while dropping the cationic ultraviolet curable composition toward the disk substrate 1a. 2 is shown in FIG. In the figure, reference numeral 15 denotes a dispenser that discharges and drops the cationic ultraviolet curable composition S,
Reference numeral 16 denotes a reaction chamber having a reflection plate on its inner surface, reference numeral 17 denotes a light source for irradiating ultraviolet rays, and reference numeral 18 denotes a disk substrate rotating mechanism for rotating the disk substrate 1a around an axis.

The dispenser 15 is fixed to the reaction chamber 16 via a connecting member 19, and discharges the cationic ultraviolet curable composition S in response to a supply from a storage unit (not shown). In the dispenser 15, although not shown, a continuous spiral space is formed by combining the stator and the rotor, and the spiral space moves in the stator by rotating the rotor. . When the rotor is rotated in one direction, the cationic ultraviolet curable composition S filled in the spiral space moves sequentially to the discharge side and is discharged from the nozzle while keeping the discharge ratio constant without pulsation. It is a mechanism. It is also possible to rotate the rotor in the opposite direction, in which case the cationic UV-curable composition S can be moved from the discharge side to the supply side, and the liquid summit generated at the nozzle tip can be eliminated. .

The reaction chamber 16 is provided with holes 16a and 16b which are vertically separated from each other and through which the cationic UV curable composition S discharged from the dispenser 15 and dropped passes. The light source 17 is provided inside the reaction chamber 16 and substantially parallel to the falling trajectory of the cationic ultraviolet curable composition S. The light source 12 is of a type that emits light continuously.

The reaction chamber 16 is provided with a blower 20 for cooling the light source 17. Blower 20
Is designed to draw outside air into the reaction chamber 16 and blow it toward the light source 17, and the air that has cooled the light source 17 is discharged out of the reaction chamber 16 through the exhaust pipe 21.

In order to eliminate the influence of the cooling air on the cationic UV-curable composition S during the dropping, the inside of the reaction chamber 16 passes through the holes 16a and 16b so that the UV-transparent cylindrical body 2 is formed.
2 is provided, and the ultraviolet light emitted from the light source 17 is irradiated to the cationic ultraviolet curable composition S falling inside the cylindrical body 22 through the wall of the cylindrical body 22.
Further, a shutter 23 for blocking ultraviolet rays from the light source 17 is provided in the hole 16a located above.

Further, a light source 17 is provided on the inner wall of the reaction chamber 16.
There is provided a lighting unit 25 for collecting a part of the ultraviolet light emitted from the light source. As shown in FIG. 3, the lighting unit 25 is arranged with the lighting surface facing the light source 17. The lighting unit 25 includes
One end of an optical fiber cable 26 for guiding ultraviolet light incident on the light collection surface to the outside of the reaction chamber 16 is connected.

Next, FIG. 4 shows the structure of the end face processing device 27 provided at the end face processing position D4. As shown in the figure, the end face processing device 27 includes a wiping mechanism 28 that abuts against the side edge of the disk 1 and wipes off the cationic ultraviolet curable composition that has protruded from the side edge, And a light emitting unit 29 for irradiating the light.

The wiping mechanism 28 is provided with a roll holding section 30 for holding a strip-shaped absorber T provided in a rolled state.
And a winding unit 31 that sequentially winds up the absorber T drawn from the roll holding unit 30 and a transfer arm 13 that guides and guides the absorber T sent from the roll holding unit 30 to the winding unit 31 while pulling it out. And a guide portion 32 which is brought into contact with the end surface of the disc 1 in a gripped state. The transfer arm 13 has a built-in rotation mechanism 33 for rotating the gripped disk 1 in the circumferential direction.

The winding section 31 is rotated by a predetermined rotation angle by a drive mechanism (not shown), and the absorber T having a length corresponding to the rotation angle is pulled out from the roll holding section 30. The roll holding unit 30 is also rotated by a predetermined rotation angle by a driving mechanism (not shown). When the absorber T is wound, the absorber T is pulled out from the winding unit 31 this time. ing.

The light emitting section 29, together with the daylighting section 25 and the optical fiber cable 26, constitutes an ultraviolet irradiating means 34. The light emitting section 29 is disposed to face the end face of the disk 1 which has been wiped off and transferred to the disk holder 2. The daylighting area of the daylighting section 25 depends on the cross-sectional area of the optical fiber cable 26 and the light emitting section 2.
9 is wider than the light emitting area of No. 9. The light emitting unit 29
Is connected to the other end of the optical fiber cable 26,
Among the ultraviolet rays emitted from the light source 17 in the reaction chamber 16, the ultraviolet rays that have entered the lighting unit 25 are intensively irradiated to the end face of the disk 1 through the optical fiber cable 26. A mechanism for rotating the disk 1 together with the disk holder 2 in the circumferential direction is provided at the end face processing position D4.

In the DVD manufacturing apparatus configured as described above, the dispenser 15 is driven to discharge the cationic ultraviolet curable composition, and the cationic ultraviolet curable composition that falls like a string draws the reaction chamber. Ultraviolet light is emitted from the light source 12 while passing through the inside of the light source 11. The cation type ultraviolet curable composition irradiated with the ultraviolet rays falls on one disk substrate 1 a placed on the table 13,
At this time, by rotating the disk substrate 1a about the axis, the cationic ultraviolet curable composition is applied in an annular shape to the bonding surface.

The disk substrate 1a coated with the cationic ultraviolet curable composition is superimposed on the disk substrate 1b by the laminating device 4 and bonded together via the cationic ultraviolet curable composition. Disk 1.

After that, when the disk 1 reaches the end face processing position D4 through the steps of pressing, axial alignment, laminating, and spreading,
In order to enhance the aesthetic appearance of the disk 1, the cationic UV curable composition protruding from the end face is removed. First, the disk 1 held by the transfer arm 13 is
Then, the disk 1 is rotated, and the cationic UV curable composition protruding from the end face is wiped off.

By the way, when the protruding cationic ultraviolet curable composition is wiped off, the reactive species for curing are also removed, and the remaining cationic ultraviolet curable composition has almost no reactive species remaining. In some cases, even if the heating process is performed, the substrate may not be hardened to a strength sufficient to join the disk substrates 1a and 1b.

Then, the ultraviolet rays collected from the reaction chamber 16 are guided through the optical fiber cable 26 and irradiated from the light emitting section 29 toward the end face of the disc 1, and the disc holder 2 located at the end face processing position D4 is rotated once. Let it. As a result, the reactive species are implanted in the cationic ultraviolet curable composition exposed to the ultraviolet light over the entire circumference of the disk 1 and exposed on the end face, and the curing is promoted based on the seed.

The optical fiber has a characteristic of narrowing down to an extremely small diameter equal to its own diameter in the process of guiding light. Therefore, the ultraviolet light collected by the light-collecting unit 25 is guided through the optical fiber cable 26 and the light is narrowed down by using the characteristics of the optical fiber. The output per unit light emitting area of the ultraviolet light irradiated from the light source is increased.

As described above, according to the DVD manufacturing apparatus, even when the cationic UV curable composition protruding from the end face of the disk 1 is wiped, the cationic UV curable composition exposed on the end face is cured. Is promoted, so that sufficient bonding strength can be given to the disk 1 to prevent a decrease in yield.

In this embodiment, the disk 1
After wiping off the cationic UV-curable composition that protruded from the end face, the end face was irradiated with ultraviolet light.However, if there was no need to remove the protruding cationic UV-curable composition, no wiping was performed. Alternatively, the end face may be irradiated with ultraviolet light. Thereby, the disk 1
Is reduced to the time required for the subsequent processing steps.
Throughput can be improved.

In the present embodiment, the ultraviolet light emitted from the light source 12 is guided by the optical fiber cable 26 and irradiated from the light emitting section 29 toward the end face of the disk 1. May be provided separately from the light source 12. For example, the light emitting unit 29
A spot light source may be provided at a position corresponding to the above.

[0047]

As described above, according to the present invention,
By irradiating the end face of the disc with ultraviolet rays, the reactive species are implanted in a concentrated manner on the ultraviolet curable composition protruding from the end face and curing is promoted, so that the productivity of the disc can be increased. Further, by wiping off the protruding ultraviolet curable composition, the aesthetic appearance of the disc can be enhanced.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view showing a configuration of the falling illumination device.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a plan view showing a configuration of a wiping mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 1a, 1b Disk substrate 3 Drop irradiation device 17 Light source 25 Lighting part 26 Optical fiber cable 28 Wiping mechanism (wiping means) 29 Light emitting part 33 Ultraviolet irradiation means

Claims (5)

[Claims] 1. A bonding method for bonding two objects using a cationic ultraviolet-curable composition as an adhesive, wherein the cationic ultraviolet-curable composition applied on one of the objects is irradiated with ultraviolet light. Bonding the one object and the other object with the cationic ultraviolet-curable composition irradiated with ultraviolet light interposed therebetween, and spot-irradiating ultraviolet light between the objects after bonding. A bonding method characterized by the above-mentioned. 2. A method for manufacturing a disk by bonding two disk substrates to one another by bonding a cationic ultraviolet-curable composition as an adhesive, wherein the cationic substrate is coated on one disk substrate. The ultraviolet curable composition is irradiated with ultraviolet light, and the one disk substrate and the other disk substrate are bonded to each other with the cationic ultraviolet curable composition irradiated with the ultraviolet light interposed therebetween. A method for manufacturing a disc, comprising irradiating spot light with ultraviolet rays toward the disk. 3. A disk manufacturing apparatus, wherein two disk substrates are bonded to each other by using a cationic ultraviolet curable composition as an adhesive to form one disk, and after bonding, ultraviolet light is directed between the disk substrates. An apparatus for manufacturing a disc, comprising: an ultraviolet irradiation means for irradiating a spot. 4. The ultraviolet irradiation means irradiates ultraviolet light spot-irradiating the ultraviolet light guided by the optical fiber cable between the disk substrates with a light source, an optical fiber cable for guiding the ultraviolet light emitted from the light source. The disk manufacturing apparatus according to claim 3, further comprising a light emitting unit. 5. The wiping device according to claim 3, further comprising a wiping unit that wipes the cationic ultraviolet curable composition exposed from between the disk substrates before irradiating ultraviolet rays between the disk substrates. Disk manufacturing equipment.