JP3355003B2 - Method and apparatus for manufacturing optical laminated disc - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention can reproduce recorded information by laminating two optically recorded disks or laminating one disk with another disk of the same shape. The present invention relates to a method and an apparatus for manufacturing an optical laminated disc.

[0002]

2. Description of the Related Art An optical video disc, which is an example of a conventional optically bonded information disc of this type, has pits serving as information formed on one surface of a transparent plastic disc.
A metal reflective film of aluminum or the like is formed on the surface by a vacuum film forming method, a protective film or an adhesive is further applied on the reflective film, and these two members are pressed and bonded together to form one optical type. It is a video disc. In such an optically bonded video disc, it is common to use what is called a hot-melt hot melt as an adhesive in the past, and this was applied to the disc surface by a roll coater and bonded. .

[0003] In this hot melt adhesive, the adhesive once melted is cooled and solidified before lamination due to the heat capacity of the disk member, so that it is difficult to perform good bonding. Further, the bonded disk is hardened by the softening point of the hot melt adhesive. Exposure to a nearby high-temperature thermal atmosphere causes the hot-melt adhesive to be in a molten state again, and cannot be used in such a possibility.

In the case of applying a hot-melt adhesive to a roll coater, when hard foreign matter such as metal is mixed in the adhesive, the foreign matter is moved between the metal roll used in the roll coater and the disk. As the metal roll presses the disc in the direction of pushing this hard foreign object,
There is a problem that information pits formed on the disc are damaged.

[0005] Further, such a hard foreign substance may damage the metal roll, and the damaged metal roll has a problem that information pits of the disc member to be applied are successively damaged by the projections of the scratch.

In addition, the applied hot-melt adhesive film is formed with a number of uneven coating patterns called rolls peculiar to the roll coater coating, which causes unevenness in the coating thickness. When two discs with such uneven coating thickness are laminated and bonded, countless irregularities of the coating pattern cause numerous voids between the adhesive layers, which remain as bubbles after bonding. Not only does the force drop, but the temperature around the disc can cause peeling and deformation during prolonged use, and air and moisture can diffuse through the gaps in the adhesive. is there. This diffused substance, especially water, causes hydrolysis of the adhesive, increases the risk of peeling, and has a problem that the diffused water attacks the aluminum reflective film.

In order to avoid such disadvantages of hot melt adhesives, radical polymerization type energy ray-curable adhesives have been developed, but this kind of adhesive is used only when energy rays are irradiated. There is a property that curing progresses, and when an adhesive layer is sandwiched between reflective films such as aluminum like an optical video disc, it is not possible to irradiate the adhesive with energy rays by passing through this reflective film. Since it cannot be expected, it is not possible to cure and bond the two disks after they are pressed. In addition, since this kind of resin cured by irradiation with energy rays has almost no tackiness on the surface, it cannot be adhered even if disks are overlapped and pressed after curing.

On the other hand, JP-A-57-149373 proposes that a cationically polymerizable energy ray-curable resin can be used as an adhesive for such an optical (laminated) video disc. In the cationically polymerizable energy ray-curable resin, the photopolymerization initiator is instantaneously decomposed by energy beam irradiation to generate a Lewis acid, which attacks the cationically polymerizable functional group,
Polymerization starts.

[0009] Since this polymerization continues even if the irradiation of energy rays is interrupted, the polymerization is started by the irradiation of energy rays.
While the polymerization is in progress and the tackiness remains on the film surface of the adhesive, the adhesive is overlaid and pressed. Even after the superposition, the adhesive continues to polymerize and is cured and solidified, so that it is possible to bond an energy-impermeable material to be adhered, which was impossible with a radical polymerization type energy ray-curable resin. . The adhesive layer cured and solidified in this way becomes a strong film, and extremely strong adhesion can be achieved as compared with a hot melt adhesive.

[0010]

However, when this cationically polymerizable energy ray-curable resin is used, the resin film applied to the disk is irradiated with energy rays such as ultraviolet rays to adhere to the film surface. Even in a state where the properties remain, it shows considerable fluidity. For this reason, when the resin is applied to the entire surface from the center hole to the outer periphery of the disk, it is pushed out to the outer and inner peripheral ends of these disks when the disks are overlapped and pressed together, and the resin protrudes and protrudes. It adheres not only to the inner and outer peripheral end faces, but also to the surface of the pressure-bonding plate for pressing the disk. The resin adhering to the surface of the compression plate in this way is successively transferred from the pressure plate to the surface of the disk to be bonded there, and significantly impairs the appearance of the disk, not only as a defective product, but also obstructs these devices. Come.

The present invention solves the above-mentioned problems in the conventional method of manufacturing an optical laminated disk, and peels or deforms due to a decrease in adhesive strength, corrosion of an aluminum reflective film, information pits even for long-term use. It is an object of the present invention to provide a method and an apparatus for manufacturing an optical laminated disc which has no danger of being damaged, has excellent durability, and does not stain a pressure bonding apparatus.

[0012]

According to the present invention, it is possible to reproduce information between disk members on which information is optically recorded, or between a disk member on which information is recorded and another disk member having the same shape. In a method of manufacturing an optically bonded disk as described above, a step of applying a liquid cationically polymerizable energy ray-curable resin on a bonding surface of a disk member, and a step of applying ultraviolet light or the like to a resin film applied on the disk member. After the cationic polymerization of the resin film is started by irradiating the energy ray, the end of the disk member is irradiated with a certain amount of infrared rays or light containing infrared rays, and the irradiated resin Curing only the film,
A step of superposing the two disk members, pressing and solidifying before the other portion of the resin film continues the cationic polymerization, exhibits adhesiveness, and solidifies.

It is preferable that the step of pressing and solidifying the two disk members is performed in a vacuum atmosphere. In addition, the two disk members are heated to a predetermined temperature in advance for bonding, and then the liquid cationic polymerization is performed. Also in the step of applying and compressing and solidifying the disk members by applying the reactive energy ray curable resin, the heating or the heat retaining process may be performed in each step as necessary so as not to lower the temperature of the disk members. .

According to the present invention, there is also provided a disk member on which information is recorded optically, or a disk member on which information is recorded and another disk member having the same shape so that the information can be reproduced. In an optical bonding disk manufacturing apparatus for bonding, means for applying a liquid cationically polymerizable energy ray-curable resin on the bonding surface of the disk member, and applying an energy ray such as ultraviolet rays to the resin film applied on the disk member. After the cationic polymerization of the resin film is started by the irradiation means and the irradiation of energy rays, the end of the disk member is irradiated with a certain amount of infrared light or light containing infrared light, and only the irradiated part of the resin film is cured. And means for superposing two disc members, pressing and solidifying before the other portion of the resin film continues cationic polymerization, exhibits tackiness, and solidifies. It is characterized in that was example.

A means may be provided for performing pressure bonding and solidification of the two disk members in a vacuum atmosphere, a means for heating the two disks to a predetermined temperature in advance for bonding, In the step of applying the cation-polymerizable energy ray-curable resin and superimposing and compressing and solidifying the disk members, a means for performing heating or heat-retaining treatment in each step as necessary so as not to lower the temperature of the disk members. It may be provided.

[0016]

The optical laminating disc of the present invention is produced by using a cationically polymerizable energy ray-curable resin as an adhesive, thereby irradiating the energy ray in the step of irradiating the energy ray. Even in a state where it is impossible, the adhesive continues to polymerize further, and by curing and solidifying, becomes an extremely excellent bonding force of the adhesive,
The penetration of air and moisture into the adhesive layer is also small, and by performing the pressure bonding in a vacuum atmosphere, the penetration is further reduced. As a result, there is a possibility that the aluminum reflective film is corroded or peeled off over a long period of time. Disappears.

According to the present invention, when such a liquid resin is applied and the disc is bonded, the resin film applied to the end of the disc is subjected to infrared rays or infrared rays prior to the pressure bonding of the disc. Thus, the resin is hardened by irradiating with light, so that it is possible to completely prevent the resin from protruding from the inner and outer peripheral ends of the disk when the disk is pressed. For this reason, the adhesion of the resin to the crimping device is eliminated, and the trouble caused by the resin can be completely eliminated.

Further, when two disks are pressure-bonded, if they are overlapped and pressed in a vacuum atmosphere, air bubbles remaining in the adhesive layer can be completely eliminated, and furthermore, the two disks can be fixed at a certain rate. After being preheated to a temperature, it is supplied to a series of steps from application of the cationically polymerizable energy-curable resin of the lamination to pressure bonding / solidification, and a means for heating and maintaining the temperature of the member so as not to lower the temperature of the disk. This makes it possible to make the curing / solidification speed of the adhesive uniform and to adjust the speed easily.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the manufacturing method and the manufacturing apparatus according to the present invention will be described with reference to FIGS. In FIG. 1, A and A 'are each formed by forming an aluminum reflective film on information pits on one surface of plastics such as polycarbonate (PC) and polymethyl methacrylate (PMMA). One optical video disc is bonded.

In this embodiment, disks A and A '
Are manufactured in a so-called in-line manner, in which an aluminum reflection film is formed by a single-wafer sputtering apparatus immediately after injection molding. Discs A and A 'on which an aluminum reflection film is formed in this manner. Was about 50 ° C. immediately after being taken out of the sputtering apparatus. The disk A and the disk A 'correspond to the station I in FIG.
In this embodiment, the disk A is described up to the station IV.

First, the disk A on which the reflection film is formed
Is supplied to the supply unit on the rotary table 1 of the station I of the manufacturing apparatus of the present embodiment such that the surface on which the adhesive is applied faces upward. The rotary table 1 has a position where a plurality of disks can be set, and as shown in FIG. 2, the rotary table 1 is rotated by a motor 12 by a pitch at an angle divided by the position where the disk is set. The disc set here takes approximately 6 hours before being transferred to station II by the rotating arm 2.
Preheated to 0 ° C. The rotating arm 2 also transfers the disk A from the station II to the station III.

The process from the station II to the station V in the embodiment is a work of 12 seconds in time for a disk having a diameter of 300 mm.
Is irradiated with ultraviolet rays in a station III, which will be described later, and is slightly heated. Therefore, the temperature drop of the disk A is very small. Was not particularly provided.

Next, the station II is rotated by the rotating arm 2.
The disk A is applied here by spin coating with an adhesive. The adhesive is a cationic polymerizable energy ray curable resin, for example, KRX-726-1 (viscosity 0.17 Pa · s) manufactured by Asahi Denka Kogyo Co., Ltd., and is rotationally shaken at a rotation speed of 3000 rpm for 3 seconds. Then, a substantially uniform film thickness of 15 μm is obtained. This is set to φ5 of disk A having a diameter of 300 mm (center hole diameter φ35 mm).
Apply in the range of 0 to 300 mm.

Thereafter, at the station II, the disk A coated with the adhesive is
The range of m to φ50 mm is sucked by the rotating arm 2, rotated by 120 °, and transferred to the station III.
Ultraviolet rays are irradiated as energy rays.

In this station III, when the ultraviolet ray was irradiated by the apparatus described in Japanese Patent Application Laid-Open No. 4-283434, the adhesive (KRX-726-1) was 300 mm in diameter.
Of the disk A of φ50 mm to 300 mm, when the output of the ultraviolet irradiation lamp is 120 W / cm, the rotation speed of the disk: θ = 50 rpm, the moving distance: 125 mm (radius r = 150 to 25 mm) Irradiation with ultraviolet light), initial movement speed: v ₀ = 30 mm / s, and irradiation with ultraviolet light under the conditions of a moving speed change gradient of 20 mm / s ² ,
The adhesive film generates a Lewis acid and polymerization is started. The adhesive film remains in a semi-liquid state until 30 seconds after the irradiation, and when the disk A and the disk A ′ are pressure-bonded at a station V described later, sufficient strength is obtained. The solidified disk AA 'reached practical strength, and became semi-solid in about 1 minute after irradiation.
After hours, it was completely cured.

Under these conditions, the disk A whose adhesive was irradiated with ultraviolet rays had a diameter of 35 mm or less with no adhesive applied.
The sample is transferred to the station IV by the transfer arm 4 which sucks a range of φ50 mm, and here, as shown in FIG.
The beam light including infrared rays generated from the short arc lamp is irradiated only to the outer peripheral end surface of the surface of the disk A coated with the adhesive and the area 0.7 mm from the outer peripheral end, and the adhesive in this portion is cured.

As shown in FIG. 3, the state of the adhesive 21 formed on the disk A has spread to the outer peripheral end surface of the disk A as shown in the figure. This disk A
Is 50 mm to 75 m on the surface where the adhesive is not applied.
The range of m is rotated by a rotation mechanism 22 that sucks and rotates the range. The guide roller 23 is brought into contact with the outer peripheral portion of the disk A to be irradiated with the beam of the disk A so that the outer peripheral portion of the disk A slightly warps toward the adhesive application surface side from the horizontal position, and the disk A is irradiated with the beam. The outer part should be
It is always at the same position.

The beam is generated from a light source 24 (for example, manufactured by Oak Manufacturing Co., Ltd .; model HMW-623 / lamp: Xe short arc ADX300, etc.), and a slit 25 is formed.
The beam is radiated to the disk A with the shutter 26 opened. A semi-transparent mirror (beam splitter) 27 is arranged in the optical path of the beam, a part of the beam is applied to a light receiver 28, the light amount is measured, and the value is processed by an arithmetic processing unit 29. The rotation speed of the mechanism 22 is controlled in real time so that the irradiation amount of the beam necessary for curing the adhesive in the portion is obtained.

A predetermined irradiation end output is given to the shutter 26 to close the shutter 26, and the disk A is always irradiated with a fixed amount. Only that portion is locally heated by the infrared ray or light containing a wavelength close to the infrared ray, and the polymerization speed initiated by the ultraviolet irradiation in the previous step is remarkably increased, and the composition is instantaneously cured.

At this time, portions other than the portion irradiated with the beam are still semi-liquid, exhibit tackiness, and are not cured.
The application of the adhesive at the station II is 7 mm or more outside the center hole (φ35 mm) of the disk, and the center hole of the adhesive when the disk A and the disk A ′ are pressed at the station V described later. Since the protrusion in the direction can be completely prevented, it is not necessary to cure the adhesive by irradiating such a beam on the inner peripheral portion of the disk.

In this way, the disk A whose adhesive has been hardened only at the outer peripheral portion and the outer peripheral end surface at the station IV is then moved to the station A by the rotating arm 6 which sucks the range of φ35 mm to φ50 mm where no adhesive is applied. The adhesive is transferred to the IV so that it is on the top. On the other hand, in the disk A 'to be bonded to the disk A, the rotation arm 6' arranged on the same rotation axis as the rotation arm 6 attracts the surface of the disk A 'on which the adhesive is not applied, and the rotation arm 6'
Of the disk A 'is inverted so that the surface of the disk A' coated with the adhesive is the lower surface, and the disk is transferred to the station IV.

Disk transferred to this station IV
A and A 'are bonded in the vacuum chamber shown in FIG. Times
Disc A transferred by the rotating arm 6 and the rotating arm 6 '
And A 'are between the two disks by the guide pins 31.
The core holes (not shown) are overlapped without eccentricity, and 500 Pa. Ma
2kg / cm on average over the entire surface of the disc ^Two
The pressing force is applied.

Here, the upper vacuum chamber 33 descends and the lower vacuum chamber 3
5 and a vacuum chamber is formed by the vacuum pump 36 and its exhaust valve 37. After being evacuated to a vacuum in the tank, the pressure plate 38 is lowered, and the two disks AA ′ sandwiched between the plates 32 are pressed. When the pressure bonding is completed, the pressure bonding plate 38 rises again, closes the exhaust valve 37 to stop the vacuum exhaust, opens the leak valve 39, returns the inside of the layer to atmospheric pressure, and raises the upper vacuum chamber 33. The disk AA 'thus bonded is taken out by the moving arm 8, and the bonding operation is completed.

In the above-mentioned bonding, if the cooling of the disk cannot be ignored at each station, a heating and heat-insulating means is arranged at each station, and the disks A, A 'and AA' are heated. The curing / solidifying speed can be made uniform, and the speed can be easily adjusted. In the case of the adhesive KRX-726-1, the disk was completely cured in about 30 minutes when the disc was heated to 60 ° C. after the lamination.

In the above embodiment, the diameter is 300 mm.
(Center hole diameter φ35 mm) Disk A φ50-300
When the adhesive was applied to the surface from the outside of the center hole of the disc by 2 mm or more from the center hole to the outer periphery of the disc, the disc A was applied.
Irradiate light including infrared rays or the like from a Xe short arc lamp to an area of 0.5 to 1.0 mm (0.7 mm in the above embodiment) and the resin film (adhesive) on the outer peripheral end face from the outer peripheral end to the inner periphery. Good to do.

When the adhesive is applied to the entire surface from the center hole of the disk A to the outer periphery of the disk A, if the adhesive is pressed as it is, the adhesive is also pushed out from the inner peripheral end of the disk A and protrudes. Therefore, Xe is applied to the resin film (adhesive) in the area of 0.5 to 1.0 mm from the outer peripheral end to the inner periphery and in the area of 0.5 to 1.0 mm from the outer peripheral end face and the center hole of the disk to the outer periphery. Irradiation with infrared rays or the like from a short arc lamp or the like is performed while controlling the irradiation amount to be constant, and the irradiated portion is cured. The end of the disk in the present invention refers to the outer peripheral end and the outer peripheral end of the disk, or the outer peripheral end, the outer peripheral end and the inner peripheral end of the disk.

Further, since spin coating is used for applying the adhesive, pressure bonding with a metal roll such as a roll coater is not required. There is no danger of damage.

As described above, the disk A on which the bonding is completed
For A ', for example, by subjecting the outer peripheral end of the disc described in Japanese Patent Application Laid-Open No. 2-94040 to a finishing process, a laminated disc having more excellent durability can be obtained.
This work can be installed after the station V in FIG. 1 of this embodiment so that the work can be continuously performed. In addition,
In the embodiment, the same effect was obtained even when the disks A and A 'were coated with various resins as protective films for protecting information pits.

[0039]

As described above, according to the method and apparatus for manufacturing an optical laminated disk of the present invention, the end of the disk is cured before the disk is pressed, and the end of the disk is pressed when the disk is pressed. Adhesive that tries to protrude from the part is prevented like a breakwater, and the adhesion of the adhesive to the crimping plate in the crimping process and the transfer of the adhesive from this crimping plate to the disk can be completely prevented. For this reason, it is possible to perform extremely excellent bonding, and it is possible to completely eliminate troubles on the apparatus.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical laminated disc manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a station I for performing preliminary heating of a disk.

FIG. 3 is an explanatory view of a station IV for hardening an outer peripheral portion of a disk by irradiation with light such as infrared rays.

FIG. 4 is a sectional view of a station for vacuum-pressing two disk members.

[Explanation of symbols]

 A, A 'Disk member 1, 1' Heating / rotating table 2, 2 'Rotating arm 3 Ultraviolet irradiation device 4, 4' Transfer arm 5 Beam irradiation device 6, 6 'Rotating arm 7 Vacuum crimping device 8 Transfer arm 12 Rotation mechanism 21 Adhesive 22 Rotation mechanism 23 Guide roller 24 Beam light source 25 Slit 26 Shutter 27 Semi-transparent mirror (splitter) 28 Light receiver 29 Operation control circuit 32 Lower pressure plate 33 Upper vacuum tank 35 Lower vacuum tank 36 Vacuum pump 38 Upper pressure plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-278584 (JP, A) JP-A-61-136563 (JP, A) JP-A-2-94040 (JP, A) JP-A-4- 293434 (JP, A) JP-A-57-149373 (JP, A) JP-A-64-49144 (JP, A) JP-A-63-27578 (JP, A) JP-A-62-12940 (JP, A) JP-A-61-292243 (JP, A) JP-A-63-27577 (JP, A) JP-A-63-78351 (JP, A) JP-A-3-252488 (JP, A) JP-A-62-259245 (JP, A) JP-A-2-58529 (JP, A) JP-A-7-62313 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09J 4/00-201 / 10 G11B 7/24-7/26

Claims (6)

(57) [Claims] 1. An optical laminator for laminating disk members on which information is optically recorded, or a disk member on which information is recorded and another disk member of the same shape so that the information can be reproduced. In the method for manufacturing a laminated disk, a step of applying a liquid cationically polymerizable energy ray-curable resin on the bonding surface of the disk member, and a step of irradiating the resin film applied on the disk member with energy rays such as ultraviolet rays By irradiating energy rays, after the cationic polymerization of the resin film is started, irradiating the end portion of the disk member with a certain amount of infrared light or light containing infrared light, and curing only the irradiated portion of the resin film, An optical bonding method comprising the steps of: laminating two disc members, pressing and solidifying before the other portion of the resin film continues cationic polymerization, exhibits tackiness, and solidifies. Method of manufacturing to disk. 2. The method according to claim 1, wherein the step of pressing and solidifying the two disk members is performed in a vacuum atmosphere. 3. A process in which the two disk members are heated to a predetermined temperature in advance to be bonded, and thereafter, the liquid members are coated with a cation-polymerizable energy ray-curable resin, and then the disk members are overlapped and pressed and solidified. 2. A heating or heat-retaining treatment is carried out in each step as necessary so as not to lower the temperature of the disk member.
A method for producing the optically bonded disc according to the above. 4. An optical bonding method for bonding disk members on which information is recorded optically or between a disk member on which information is recorded and another disk member of the same shape so that information can be reproduced. In an apparatus for manufacturing a laminated disk, a means for applying a liquid cationically polymerizable energy ray-curable resin on a bonding surface of a disk member, and a means for irradiating an energy ray such as ultraviolet rays to a resin film applied on the disk member By irradiation of energy rays, after the cationic polymerization of the resin film is started, the end of the disk member is irradiated with a certain amount of infrared light or light containing infrared light, and means for curing only the irradiated portion of the resin film, The other portion of the resin film continues cationic polymerization, exhibits tackiness, and has a means for laminating two disc members, and pressing and solidifying before solidifying. Apparatus for producing an optical lamination disks to. 5. An apparatus according to claim 4, further comprising means for pressing and solidifying the two disk members in a vacuum atmosphere. 6. A means for heating two discs to a predetermined temperature in advance for laminating, and a step for applying a liquid cation-polymerizable energy ray-curable resin and thereafter superimposing and compressing and solidifying disc members. 5. The apparatus according to claim 4, further comprising means for performing a heating or heat-retaining treatment in each step as necessary so as not to lower the temperature of the disk member.