JP2001291286A - Rigid disk, spreading device, method for manufacturing disk and device for manufacturing disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rigid disk, a spreading device, a method and device for manufacturing a disk such that a disk with minimum warpage can be manufactured when the disk is manufactured by using a cationic UV curing composition, that production of foreign matter is suppressed and that the frequency for halting the device can be decreased. SOLUTION: The cationic UV curing composition interposed between two disk substrates which constitute the disk is spread by alternately laminating the disk and a rigid disk G. The rigid disk G is obtained by attaching a resin bush 105 made of vinyl chloride or the like detachably to an Al disk body 104, for example, so as to suppress dusting due to friction with a spindle 91. A plurality of circular holes 108 are formed in the rigid disk G, and coatings consisting, for example, of ethylene tetrafluoride may be applied on the upper and lower faces 101U, 101L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, digital
The present invention relates to a rigid disk, a spreading device, a disk manufacturing method, and a disk manufacturing device suitable for manufacturing an optical disk such as a video / versatile disk (hereinafter abbreviated as DVD).

[0002]

2. Description of the Related Art In manufacturing a bonding type DVD, a method of bonding two disk substrates together using an ultraviolet-curable composition or the like as an adhesive is adopted.

Conventionally, a radical polymerization type ultraviolet curable composition has been used as the ultraviolet curable composition. When this radical polymerization type ultraviolet curable composition is used, the composition is applied to the surface of a disk substrate, and then two disk substrates are overlapped with each other, and the composition is cured by irradiating ultraviolet rays in this state. . However, in the case of a DVD, A is required until the UV reaches the radical polymerization type UV-curable composition existing as an adhesive layer between the two disk substrates.
Since a thin film such as 1 exists, high ultraviolet intensity is required. For this reason, a large-capacity ultraviolet lamp facility is required, and the facility becomes large-scale, which ultimately affects the product manufacturing cost. DVD-RAM
In some cases, there is a layer such as a ZnS—SiO ₂ film that does not substantially transmit ultraviolet light. In such a case, the radical polymerization type ultraviolet curable composition cannot be used as an adhesive itself.

Therefore, in recent years, a method has been developed in which a cationic UV-curable composition having a slow curing property as compared with a radical polymerization type UV-curable composition is used as an adhesive.
In this method, application to a disk substrate, superposition of two disk substrates, and the like are performed after the cationic ultraviolet-curable composition is irradiated with ultraviolet light and before the cationic ultraviolet-curable composition is cured. This solves the above problem.

In applying the above-mentioned cationic ultraviolet curable composition to a disk substrate, there is a method in which a liquid ultraviolet curable composition is dropped from a nozzle on the upper surface of a disk substrate set in a substantially horizontal state. More specifically, while dropping the cationic ultraviolet curable composition from the nozzle in the fixed state, irradiate ultraviolet rays from the side,
The cation type ultraviolet curable composition is applied on the disk substrate in a substantially annular shape by dropping the disk on the disk substrate rotated below. In this manner, another disk substrate is superimposed on the disk substrate on which the cation-type ultraviolet curable composition irradiated with ultraviolet light has been applied,
The cationic UV curable composition is spread between both disk substrates. Then, when the cationic ultraviolet curable composition is cured, the two disk substrates are bonded to each other to obtain one disk.

[0006]

When a disk is manufactured by using a cationic UV-curable composition as an adhesive, a predetermined time is required until the cationic UV-curable composition is cured. Therefore, after the two disk substrates are bonded together, the deformation of the disk substrate and the relative displacement of the two disk substrates do not occur until the cationic ultraviolet curable composition is cured. There is a need to. The finally obtained disk, that is, DVD, is required to have a warp angle of not more than a predetermined standard value.

The present invention is directed to a rigid disk and a spreading device capable of manufacturing a disk with a minimum warpage when manufacturing a disk using an ultraviolet curable composition based on such technical problems. It is an object to provide a disk manufacturing method and a disk manufacturing apparatus.

[0008]

Means for Solving the Problems Under the above-mentioned object, the present inventors have conducted intensive studies, and as a result, a cationic ultraviolet curable composition was applied to a disk substrate, and two disk substrates were superposed. Thereafter, it was confirmed that it is preferable to spread (spread) the cationic ultraviolet curable composition existing between the two disk substrates in an uncured state on a flat surface. Further, for example, in the case of continuously producing disks with a cycle time of about 5 seconds, in order to secure the spread time of the cationic ultraviolet curable composition, a predetermined number of disks, such as a buffer, are required during the disk manufacturing process. We also found that it is effective to stack disks and perform spreading in this state.

Based on these findings, the present inventors have
In Japanese Patent Application No. 2000-80937, a technique has been proposed in which a predetermined number of disks and rigid disks are alternately laminated to spread a cationic ultraviolet curable composition. Specifically, in this technique, the rigid disk is formed into a disk shape having flat surfaces at the top and bottom. Then, using the holes at the center portions formed on both the disk and the rigid disk, these disks and the rigid disk are alternately stacked and set on the spindle provided in the vertical state, and the spreading is performed in this state. Do it.

Here, the present inventors have proposed a rigid disk,
It was circulated in the disk manufacturing apparatus and used multiple times. And, in terms of processing accuracy, durability, cost, etc., for example, for a spindle formed of stainless steel (SUS),
The rigid disk is formed of, for example, aluminum (Al) from the viewpoint of ease of processing, light weight, cost, and the like.
Then, as the number of times of use increases, the contact portion of the rigid disk with the spindle, that is, the inner peripheral surface of the hole formed in the center portion of the rigid disk is cut, and the material (here, for example, Al) forming the rigid disk is finely divided. There is a problem that grains are generated. If these particles adhere to a disk as a product, a so-called foreign matter defect occurs, which causes a deterioration in quality.

Another problem arises when a rigid disk is used. That is, when the disks and the rigid disks are alternately stacked as described above, the rigid disks may be taken out one by one from a portion where only a plurality of rigid disks are stacked. Then, after predetermined processing such as spreading by alternately laminating the disks and the rigid disks, the disks are taken out one by one.
In this case, the disc to be a product is separated from the rigid disc which is circulated and reused in the apparatus. In order to perform these operations, it is general to use a holding mechanism such as a vacuum suction pad to suction-hold the uppermost disk or the rigid disk among the stacked disks or the rigid disks on the upper surface thereof. is there. However, when holding a stacked disk or rigid disk, another rigid disk or disk located immediately below the disk or rigid disk to be held may adhere to the disk or rigid disk and be taken out. For example, when only rigid disks are stacked, two rigid disks are taken out. Also, when disks and rigid disks are alternately stacked, a rigid disk immediately below the disk is removed when the disk is to be removed, and a disk immediately below the rigid disk is removed when the rigid disk is to be removed. Such a so-called 2
The sheet-collecting phenomenon is caused by the rigid disks located above and below each other, or the close contact between the rigid disks and the disks to form a vacuum state, or the electrification of static electricity generated in a resin disk or the like. I think that the.

[0012] The rigid disk of the present invention proposed to solve the above-mentioned problems is characterized in that the ultraviolet-curable composition interposed between two disk substrates constituting the disk is spread with the disk. A rigid disk for stacking and regulating the surface of the disk, wherein a disk main body having an opening formed in the center and a spindle which is detachably provided in the opening and which holds the rigid disk are inserted. A bush member forming a hole formed in the disk body, wherein the friction generated between the bush member and the spindle is lower than the friction between the material forming the disk body and the material forming the spindle. The bush member is formed of a low friction member. That is, when the spindle is formed of, for example, SUS and the disk main body is formed of, for example, Al, the bush member is less than the friction between SUS, which is the material forming the spindle, and Al, which is the material forming the disk main body. The bush member is formed of a low friction member so that the friction between the spindle and the spindle (SUS) is lower.
Here, the rigid disk of the present invention may be characterized in that the low friction member is made of resin.

As compared with the case where the entire rigid disk is formed of, for example, Al, as the inventors of the present invention have tried, a bush member made of a low friction member such as a resin is used as described above. Thereby, the friction between the spindle and the rigid disk can be reduced. as a result,
The wear of the rigid disk is suppressed, and the generation of foreign matter is reduced. Here, when the spindle is made of SUS, as a specific material for forming the bush member, for example, vinyl chloride, polypropylene, or the like is preferable if it is a resin. Such a resin not only has a lower friction with the spindle than the disk body, but when a force acts to tear the bush member due to the friction,
It is preferable that the material is hardly torn, that is, a material with high tenacity. As the low friction member, for example, if the friction of the material forming the spindle is lower than that of the disk body, a resin containing a material having a friction reducing effect such as ethylene tetrafluoride (so-called Teflon) is used. Or a metal-based material. However, when a metal or the like is used as the low-friction member, if the metal is much harder than the spindle, the spindle side may be scraped next time, so care must be taken in selecting the material. Of course, when the spindle is made of a material other than SUS, it goes without saying that the bush member may be made of another material.

Further, by making the bush member detachable from the disk main body, even when it becomes necessary to replace the bush member due to long-term use or the like, the bush member can be easily replaced.

As the disk substrate, a well-known one can be used. The substrate is a non-reinforced thermoplastic resin containing no reinforcing agent such as glass fiber or an inorganic filler, and aluminum or silver is provided on one surface of the substrate. And a thin film such as a semi-reflective film (semi-permeable film) of gold or the like, or a film in which these thin films are further covered with a protective layer. As the thermoplastic resin, for example, polycarbonate,
Amorphous polyolefin, acrylic resin and the like can be mentioned. As the cationic ultraviolet curable composition, known and commonly used ones can be used. For example, it is preferable that an epoxy resin and a cationic polymerization initiator are used as essential components. The use of a photo-radical generator in combination with this initiator is also preferable for effective curing because ultraviolet light can be effectively used in a wider wavelength range.

Further, the rigid disk of the present invention may be provided with an adhesion preventing means for preventing the rigid disk from adhering to the disk. In this case, when the rigid disk and the disk are stacked, or When a plurality of rigid disks are stacked, when the uppermost rigid disk or the disk is lifted, close contact with the disk immediately below or the rigid disk is prevented, and so-called two-disk picking can be prevented.

Further, when the present invention is grasped as a spreading device, the present invention spreads the ultraviolet curable composition on a disk having an ultraviolet curable composition interposed between two disk substrates. An apparatus, having a through hole in the center thereof, a rigid disk alternately stacked with the disk,
A spindle formed in a center portion of the disc and a spindle provided in a vertical state for holding the disc and the rigid disc by being inserted into the insertion hole of the rigid disc, and a spindle provided in a vertical state; The inner peripheral surface of the insertion hole, which is a contact surface with the spindle, is formed of a material having low dust generation due to friction with the spindle.

In such a spreading device, the disk and the rigid disk are held by the spindle in a stacked state, so that the weight of the disk or the rigid disk located above causes the two disks to constitute the disk. The ultraviolet curable composition spreads and spreads over the entire surface. At this time, by restricting the surface of the disk with the rigid disk, deformation and deviation at the time of completion of spreading are minimized, and as a result, warpage of the disk after curing is suppressed. And
By forming the inner peripheral surface of the insertion hole of the rigid disk with a material that is low in dust generation due to friction with the spindle, dust generation from the rigid disk is suppressed even when the rigid disk is inserted and removed multiple times with respect to the spindle. Can be. Here, materials with low dust generation due to friction with the spindle
Although it is selected according to the material of the spindle, when the spindle is, for example, SUS, it may be made of, for example, resin or hard rubber, or may be made of metal. In order to satisfy such a condition that the dust generation is low, it is conceivable that the friction with the spindle has high wear resistance, high stickiness, low friction, and the like. The criteria for these conditions are the SUS spindle and the Al rigid disk that the present inventors have already tried, and the material to be used is higher than that when at least the entire rigid disk is made of Al. Dust must be low. Of course, the lower the dust generation, the higher the effect, and the material is not limited to the above.

In such a spreading apparatus, it is not always necessary to use a cationic UV-curable composition as the UV-curable composition. For example, even when a radical polymerization type UV-curable composition is used. good. That is, when the radical-curable ultraviolet-curable composition is spread between two disk substrates prior to irradiation with ultraviolet light, the spreading device of the present invention can be applied. Here, as the radical type ultraviolet curable composition, known and commonly used ones can be used.For example, oligomers such as urethane acrylate or trimethylolpropane triacrylate, etc. It is preferable that the radical polymerizable compound and the radical polymerization initiator are included as essential components.

The present invention can also be characterized in that the insertion hole of the rigid disk is formed of a material softer than the spindle. As a result, the spindle side is not damaged or scraped by the rigid disk, and it is possible to prevent the diameter of the spindle from being out of order and the generation of foreign matter.

The present invention can be understood as a method for manufacturing a disk. The present invention provides a method of dropping a cationic ultraviolet-curable composition into a ring shape on a disk substrate, and the step of dropping the cationic ultraviolet-curable composition in the process of dropping. An ultraviolet irradiation step of irradiating an object with ultraviolet light, a superposition step of superposing another disk substrate on a surface of the disk substrate on which the cationic ultraviolet curable composition has been dropped to obtain one disk, And a laminating step of alternately stacking and holding rigid disks having flat surfaces on the top and bottom, and in the laminating step, a spindle is inserted into a hole formed in the center of each of the disk and the rigid disk, The hole of the rigid disk is formed of a material having low dust generation due to friction with the spindle. It can be.

Thus, another disk substrate is superimposed on the disk substrate coated with the cationic ultraviolet ray curable composition irradiated with ultraviolet rays in a ring shape.
One disc is obtained. The disk and the rigid disk having a flat surface are alternately stacked and held, so that the ring-shaped cationic type is formed between the two disk substrates in a state where the disk surface is regulated by the rigid disk. The ultraviolet curable composition spreads, and the warpage of the disc is suppressed. Also in this case, by forming holes in the rigid disk with a material that is low in dust generation due to friction with the spindle, dust generation from the rigid disk can be suppressed even when the rigid disk is inserted and removed multiple times with respect to the spindle. Can be.

The rigid disk according to the present invention is a rigid disk having flat surfaces on the upper and lower sides and used by being stacked on another disk member, and having an adhesion preventing means for preventing the disk from being in close contact with the other disk member. It can also be characterized. And, as the adhesion preventing means, on the flat surface,
An air holding portion for holding air is formed between the other disk member and the other disk member. Further, as another adhesion preventing means, an antistatic treatment may be applied to the flat surface. Further, the rigid disk of the present invention may be characterized in that the rigid disk is coated with ethylene tetrafluoride.

As described above, for example, a through hole or a concave portion is formed in a rigid disk as an air holding portion serving as an adhesion preventing means, so that the rigid disk can be connected to another disk member (for example, a disk or another rigid disk). When the rigid disk is stacked, air is held between the rigid disk and the other disk member by the through holes and the recesses, thereby preventing the rigid disk from being closely attached to the other disk member. Also, by applying an antistatic treatment to the rigid disk as an adhesion preventing means, it is possible to prevent the rigid disk from adhering to other disk members due to electrostatic charging. As a specific example of the antistatic treatment, a coating containing a conductive substance such as conductive carbon, tin oxide, antimony oxide, indium oxide, and metal powder, and a coating of a conductive polymer are suitable. When performing an antistatic treatment as an adhesion preventing means, the rigid disk may be coated with another material other than the above, or a part or all of the rigid disk may be formed of a material having an antistatic effect. good. Further, by coating the rigid disk with ethylene tetrafluoride, it is possible to reduce friction between the rigid disk and other disk members, prevent adhesion, and prevent dust generation. The coating with ethylene tetrafluoride may be applied to the entire rigid disk, or may be applied to only a part (for example, a flat surface). In this way, when a rigid disk is stacked with a disk, or when a plurality of rigid disks are stacked, when the rigid disk or the disk is lifted, another rigid disk or a disk (other disk member) immediately below is lifted together. Lifting can be prevented.

Further, when the present invention is grasped as a disk manufacturing apparatus, the present invention provides a coating means for applying a cationic ultraviolet curable composition irradiated with ultraviolet rays to a disk substrate; Superimposing means for superimposing the disk substrate coated with an object on another disk substrate, a disk obtained by superimposing the disk substrate on the other disk substrate, a restricting portion for restricting warpage of the disk, and Stacking means for stacking on the rigid disk having an adhesion preventing portion for preventing the disk from adhering, and spreading the cationic ultraviolet curable composition between the disk substrate and the other disk substrate. It is characterized by the following. According to such a disk manufacturing apparatus, in order to perform the spreading process of the cationic ultraviolet curable composition in the spreading means, stacking the disk and the rigid disk, or after the completion of the spreading process,
When taking out the stacked disks and the rigid disks, it is possible to prevent two disks from being taken out.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings. FIG. 1 is a layout diagram for explaining an entire configuration of a rigid disk, a spreading device, a disk manufacturing method, and a disk manufacturing device according to the present embodiment. In this figure, the symbol A is, for example, D
A disk manufacturing apparatus for manufacturing a disk such as a VD, d1,
d2 is a disk substrate, and D is a disk obtained by bonding disk substrates d1 and d2. Here, the disk D and the disk substrates d1 and d2 constituting the disk D include:
As is well known, a hole having a predetermined diameter (φ15 mm) is formed at the center thereof.

In the disk manufacturing apparatus A shown in FIG. 1, in the order of the processing steps, the substrate loading section 10 for loading the disk substrates d1 and d2, the cationic ultraviolet curable composition is irradiated with ultraviolet rays, and the ultraviolet rays are irradiated on the disk substrate d1. Irradiating section (coating means) 20 for dropping and applying to the substrate, a disk substrate d1 coated with the cationic ultraviolet curable composition and a disk substrate d
Overlapping section (overlapping means) 3 for superimposing 2 on
0, a pressing portion 40 for pressing the disk D obtained by overlapping the disk substrates d1 and d2, a spreading portion (stacking device, a stacking device for stacking a plurality of disks D and spreading the cationic ultraviolet curable composition). Spreading means) 50, an end face treatment section 60 for treating the cationic UV curable composition protruding from the end face of the disc D, an end face curing promoting section 70 for accelerating the curing of the cationic UV curable composition on the end face of the disc D, The disk D is inspected and configured to include an inspection selection section 80 for selecting non-defective products and defective products. Hereinafter, the configuration of each unit will be described together with the method of manufacturing the disk D.

In the substrate loading section 10, the disk substrates d1 and d2 sent in a state where a plurality of the substrates are stacked from the previous process (disk substrate manufacturing process) are taken out one by one by a take-out means (not shown). Then, the disc substrate d1 is conveyed toward the falling irradiation unit 20 and the disc substrate d2 is conveyed toward the overlapping unit 30 by a conveyance unit (not shown).

The drop irradiation section 20 is provided with a rotary table 21. The rotary table 21 is provided with a substrate table 22 for mounting a disk substrate d1, as shown in FIG. 2, at three locations at equal intervals in the circumferential direction.
The rotary table 21 is driven by a drive source (not shown) as shown in FIG.
By rotating in the direction of the middle arrow (a),
A receiving position 21a for receiving the disk substrate d1 conveyed by a conveying means (not shown), a drop position 21b for dropping the cationic ultraviolet curable composition, and a dispensing position for dispensing the disk substrate d1 to the overlapping portion 30. 21c
, Three steps are sequentially performed. Each board base 22 is rotationally driven by a drive source (not shown), thereby placing the disk board d1 on the board base 22 and rotating it while maintaining a substantially horizontal state about its central axis. I have.

As shown in FIG. 2, a drop irradiation device 23 is provided above the drop position 21b. The drop irradiation device 23 includes a dispenser 24 that discharges and drops (or may drop) the cationic ultraviolet curable composition, and an ultraviolet lamp that irradiates the cationic ultraviolet curable composition falling from the dispenser 24 with ultraviolet light from the side. 25, and a housing 26 that covers the periphery of the ultraviolet lamp 25 and has a reflection plate on its inner surface. The housing 26 has openings 26a and 26b on the upper and lower surfaces thereof.
A tube 27 made of quartz or the like is provided between 6b.
The cationic ultraviolet curable composition falling from the dispenser 24 passes through the inside of the tube 27. The upper opening 26a is provided with a shutter 28 that is opened and closed by a driving source such as a cylinder (not shown). The shutter 28 is opened when the cationic ultraviolet curable composition is not dropped from the dispenser 24. The portion 26a is closed. This prevents the ultraviolet light from the ultraviolet lamp 25 from irradiating the cationic ultraviolet curable composition at the tip of the dispenser 24 through the opening 26a.

When the cationic UV-curable composition is dropped and applied in the drop irradiating section 20, the receiving position 2
1a, the disk substrate d1 mounted on the rotary table 21 is moved to the falling position 2 by the rotation of the rotary table 21.
Move to 1b. At the drop position 21b, the disk substrate d
The cation type ultraviolet curable composition is dropped from the dispenser 24 while rotating the substrate stand 22 on which 1 is mounted.
At this time, the ultraviolet ray from the ultraviolet lamp 25 is applied to the cationic ultraviolet curable composition falling in the tube 27.
Thus, the cationic ultraviolet curable composition irradiated with ultraviolet rays is applied on the disk substrate d1 in a substantially ring shape. Then, the disk substrate d1 to which the cationic ultraviolet curable composition has been applied moves to the payout position 21c by the rotation of the turntable 21, and is paid out to the overlapping portion 30 by a transporting means (not shown).

As shown in FIG. 3, the overlapping portion 30
The fixed-side base 31 on which the disk substrate d1 paid out from the payout position 21c is placed, and the disk substrate d directly transported from the substrate loading unit 10 by a transport means (not shown).
2 on which the rotating base 2 is placed. The rotation side base 32 is rotationally driven by a motor or the like (not shown) around a shaft 32a provided at an intermediate portion between the rotation side base 32 and the fixed side base 31. The inversion operation is performed between the state in which the base 31 is opposed to the base 31. Here, the fixed side base 31 and the rotating side base 32 are provided with positioning shafts 33 and 34 for positioning the disk substrates d1 and d2 at the center thereof. Among these, the positioning shaft 34 provided on the rotating base 32 is driven forward and backward along the axial direction by a cylinder 34 a provided on the back side of the rotating base 32, and thereby, from the surface of the rotating base 32. It can be moved between a protruding position and a position submerged from the surface. In order to adsorb the disk substrates d1 and d2, the concave concave portions 35 and 36 formed on the surfaces of the fixed side base 31 and the rotary side base 32, and these concave concave portions 3 and 36, respectively.
Communication holes 37, 38 communicating with 5, 36 are formed. A negative pressure source (not shown) is connected to the communication holes 37 and 38, and the disk substrates d1 and d2 can be sucked by the fixed base 31 and the rotating base 32 by the negative pressure generated by the negative pressure sources. It has become.

In such an overlapping portion 30, a disk substrate d1 coated with a cationic ultraviolet curable composition irradiated with ultraviolet rays is placed on the fixed side base 31, and a disk The substrate d2 is placed. Then, the disk substrates d1 and d2 are sucked and positioned in the suction concave portions 35 and 36, and in this state, the rotating base 32 is inverted, and the disk substrate d2 is overlaid on the disk substrate d1 on the fixed base 31. At this time, the positioning shaft 34 of the rotating base 32 is retracted by the cylinder 34a so that the positioning shafts 33 and 34 do not interfere with each other.
2, the disk substrate d2 can be prevented from shifting. Thus, the disk substrate d1,
d2 is superimposed, thereby obtaining a disk D. In this state, the cationic ultraviolet curable composition has not been completely cured yet.

The pressing section 40 includes a pressing mechanism 41 for pressing the disk D, and a supply / discharge mechanism 42 for holding the disk D at its outer peripheral portion and supplying / discharging the pressing mechanism 41. As shown in FIG. 4, the pressing mechanism 41 includes a lower base 43 on which the disc D is placed, and an upper base 44 disposed above and opposed to the lower base 43. The lower base 43 is driven up and down by the cylinder 45 toward the upper base 44 so that the lower base 4
The disc D mounted on the disc 3 is pressed against the upper base 44 and pressed. Also, the lower base 4
3. The upper base 44 is provided with a boss 43a and a boss hole 44a at the center thereof. The boss 43a and the boss hole 44a are in contact with each other, and the lower base 43,
The surface of the upper base 44 is arranged at a predetermined interval. As a result, the lower base 43 is
When pressed against the disk D, the boss 43a and the boss hole 44a function as stoppers so that the disk D is not excessively pressed.

In the pressing portion 40, the disc D superposed by the superposing portion 30 shown in FIG. 1 is received by the supply / discharge mechanism 42, and is placed on the lower base 43. Next, the lower base 43 is raised by driving the cylinder 45 and pressed against the upper base 44, and the mounted disk D is pressed at a predetermined pressure for a predetermined time. Thereby, the cationic ultraviolet curable composition applied in a ring shape,
It is primarily spread between the two disk substrates d1 and d2. Then, the disk D whose primary spreading has been completed is discharged to the post-process side by the supply / discharge mechanism 42 shown in FIG.

In FIG. 1, the disc D ejected from the pressing portion 40 is transported by the transport device 49 to a subsequent process. The transport device 49 holds the disk D in a hole (not shown) at the center thereof in order to prevent the disk substrates d1 and d2 from shifting during transportation. At this time, for example, a holding member (not shown) that can be expanded by supplying air or the like is used, and the hole at the center of the disc D is
(Not shown), the disk substrate d1,
The displacement of d2 is prevented.

The disk D transported by the transport device 49 is loaded with a later-described expanding section 50, an end face processing section 60,
The spreading portion 50, the end face processing section 60, and the end face hardening acceleration section 70 are sequentially sent to the end face hardening acceleration section 70, and are arranged on the outer periphery of the turntable 90. Spindles 91 of a predetermined length protruding upward are provided on the turntable 90 at six locations at equal intervals in the circumferential direction for stacking a plurality of discs through the disc D. The spindle 91 is formed with an outer diameter having a predetermined accuracy with respect to a hole at the center of the disk D. The material of the spindle 91 is stainless steel (SUS SUS) in consideration of machining accuracy, durability, cost, and the like. ) Is preferred. As shown in FIG. 5, each spindle 91 is provided with an elevator 92 which moves up and down along the spindle 91 and mounts a disk D on its upper surface. When loading the disk D or extracting the disk D from the spindle 91, the elevator 92 is moved up and down so that the loading operation or the extracting operation is always performed at a constant height. Reference numeral 93 denotes a rotary table for rotating the spindle 91 around its axis.

As shown in FIG. 1, this rotary table 9
0 denotes a stacking position P1 for stacking the discs D conveyed by the conveying device 49, and a spreading position P2 as a spreading section 50 for secondly spreading the stacked discs D by leaving them for a predetermined time.
In order to perform the end face processing in the end face processing unit 60, a take-out position P3 for taking out the stacked disks D one by one, an end face processing position P4 for performing the end face processing on the taken-out discs D, and stacking them again, A drive (not shown) for sequentially stopping each spindle 91 at a total of six positions, a curing acceleration position P5 where the curing acceleration processing is performed by the unit 70 and a dispensing position P6 where the discs D are dispensed one by one toward the inspection and sorting unit 80 The source is rotationally driven in the direction of arrow (b) in FIG.

At the stacking position P1, the discs D transported one by one by the transport device 49 are passed through the spindle 91,
A predetermined number (for example, 60) is laminated. Here, as shown in FIG. 5, at the stacking position P1, the rigid disks G and the disks D are alternately stacked. The rigid disk G is made of, for example, Al and has upper and lower surfaces formed with a flatness of, for example, ± 50 μm. By placing the disk D on the rigid disk G having such a flat surface, the cationic ultraviolet curable composition is spread while the surface of the disk D is regulated.

The rigid disk G is supplied from the payout position P6 to the stacking position P1 by the first transfer arm 51 reciprocating between the stacking position P1 and the payout position P6 shown in FIG. When the disk manufacturing apparatus A is started, as shown in FIG. 6, only a predetermined number of rigid disks G are inserted into the spindle 91 located at the dispensing position P6, and the rigid disk G is first transported from the dispensing position P6. Arm 5
1 to take out one by one and supply it to the stacking position P1. During the continuous operation of the disc manufacturing apparatus A, the discs D and the rigid discs G to be manufactured in advance are alternately stacked at the payout position P6. When unloading, the rigid disks G are taken out one by one from the payout position P6 by the first transfer arm 51 and supplied to the stacking position P1. As described above, the disk D transported by the transport device 49 and the rigid disk G supplied from the payout position P6 by the first transport arm 51
Are alternately stacked as shown in FIG. At this time,
The elevator 92 descends at a predetermined pitch, and the height at which the disk D and the rigid disk G are mounted is always constant. When a predetermined number (for example, 60) of disks D are stacked, the rotating table 90 is rotated to move the stacked disks D to the spreading position P2.

At the spreading position P2 as the spreading section 50, the stacked disks D are left for a predetermined time (until the predetermined number of disks D of the next batch are stacked at the stacking position P1), and The secondary spreading of the cationic ultraviolet curable composition between the two disk substrates d1 and d2 constituting the disk D is performed. The disk D in the stacked state after the completion of the secondary spreading is moved to the unloading position P by the rotation of the turntable 90.
Stepped to 3.

The edge processing unit 60 includes an edge processing device 61 for wiping the cationic ultraviolet curable composition protruding from the edge of the disk D, a transfer arm 62, and an edge ultraviolet irradiation device 63. . The end face processing device 61 includes, for example, a strip-shaped wiping tape 64 made of a nonwoven fabric or the like, a feeding roll 65 for feeding out the wiping tape 64, and a wiping tape 64 fed from the feeding roll 65. And a take-up roll 67 for taking up the wiping tape 64. In addition, the transfer arm 6
2 is reciprocally movable between a take-out position P3 and an end face processing position P4, and is capable of holding a disk D and a rigid disk G one by one by, for example, a vacuum mechanism. Further, the transfer arm 62
A rotating mechanism (not shown) for rotating the held disk D is provided. The end surface ultraviolet irradiation device 63 is provided with the ultraviolet light source 6.
The ultraviolet light sent from 8 through the optical fiber 69 is
This is for irradiating the end face of the disk D held by the transfer arm 62.

In the end face processing section 60, the transfer arm 62 separates the disk D or the rigid disk G located at the uppermost position from the disk D and the rigid disk G stacked at the unloading position P3 one by one. It is held, transferred to the end face processing position P4, and passed through the spindle 91 located at the end face processing position P4. In this way, the transfer arm 62 transfers the disk D and the rigid disk G one by one from the removal position P3 to the end face processing position P4. Here, the take-out position P3, the end face processing position P4
In the above, the disk D or the rigid disk G is taken out and mounted at a predetermined same height by raising and lowering the elevator 92 (see FIG. 4) at every predetermined pitch. Then, as described above, the removal position P3
When the disk D is transferred from to the end face processing position P4, the wiping tape 64 pressed by the pressing roller 66 is pressed against the end face of the disk D held by the transfer arm 62, and the disk D is rotated in this state. . Thereby, the two disk substrates d1 and d constituting the disk D
If there is a cationic ultraviolet curable composition that has protruded from the space between the two to the outer peripheral side, it is wiped off with a wiping tape 64. Further, the optical fiber 6 of the end surface ultraviolet irradiation device 63 is used.
By irradiating the end face of the disk D rotated by holding the transfer arm 62 with the ultraviolet light emitted from the transfer arm 9, a new reactive species is added to the cationic ultraviolet curable composition after wiping with the wiping tape 64. Can be planted. Further, the wiping tape 64 is sequentially fed by rotating the pay-out roll 65 and the take-up roll 67 at appropriate intervals to renew the contact surface with the disk D. Then, the end face processing is completed, and a predetermined number of discs D are stacked again at the end face processing position P4, and are sent to the curing acceleration position P5 by rotation of the turntable 90.

The end face hardening promoting section 70 provided at the hardening promoting position P5 includes a housing 71 covering the hardening promoting position P5, and a heat source 72 such as a heater provided in the housing 71. ing. As shown in FIG.
0, the curing acceleration position P
The disk D located at No. 5 is heated, thereby accelerating the curing of the cationic ultraviolet curable composition on the outer peripheral end surface of the disk D. In FIG. 7, the rigid disks G alternately stacked with the disks D are not shown. Here, instead of the heat source 72, an ultraviolet light source may be provided, and by irradiating the disk D with ultraviolet light, the curing of the cationic ultraviolet curable composition on the outer peripheral end surface may be promoted. Then, the disk D in the stacked state where the end face hardening acceleration processing is completed at the hardening acceleration position P5 is sent to the payout position P6 by the rotation of the turntable 90.

As described above, with respect to the disks D stacked in a predetermined number on the turntable 90 at the stacking position P1, the turntable 90 is sequentially rotated so that the stacking positions P1 to the payout position P6 are changed. At each position, the secondary spreading process in the spreading section 50, the end face processing in the end face processing section 60, and the end face hardening acceleration processing in the end face hardening acceleration section 70 are sequentially performed. Then, at the payout position P <b> 6, the discs D that have been completely processed are taken out one by one by the second transfer arm 81 and transferred to the inspection and sorting unit 80.
Further, at the payout position P6, the rigid disks G alternately stacked with the disk D are taken out one by one by the first transfer arm 51 and stacked to be alternately stacked with a new disk D as described above. It is supplied to the position P1 and is circulated and used in the disk manufacturing apparatus A.

The inspection selection unit 80 detects the warp angle of the disk D, for example, by an inspection device (not shown), determines that the disk D is non-defective if the detected warp angle is within a predetermined standard, and determines whether the warp angle is out of the predetermined standard. If it is defective, it is determined to be defective. Then, based on the result of the determination, the third transport arm 82 sorts and pays out the disks D to a good disk payout unit 83 and a defective disk payout unit 84. Thus, the disk substrates d1 and d2 are bonded together using the cationic ultraviolet curable composition as an adhesive, and the disk D is manufactured.

The rigid disks G alternately stacked with the disks D on the rotary table 90 have the following configuration. That is, as shown in FIGS. 8 (a) and 8 (b), the rigid disk G has an insertion hole (hole) 100 through which the spindle 91 is inserted at the center, and has a predetermined thickness (for example, 1.5 mm). It is formed in the shape of a disc. The upper and lower surfaces (flat surfaces, regulating portions) 101U and 101L are ±
It is formed with a flatness of about 50 μm. The outer diameter of the rigid disk G is smaller than the outer diameter of the disk D by a predetermined dimension, so that it does not interfere with burrs generated on the outer peripheral edge of the disk D due to injection molding. A ring-shaped groove 103 is formed on each of the upper and lower surfaces 101U and 101L in order to avoid interference with a ring-shaped protrusion 102 (see FIG. 5) formed on the disk D.

The main portion of the rigid disk G is formed by a disk body 104 made of, for example, Al, and the portion forming the insertion hole 100 at the center is formed by a bush (low friction member) 105. Bush 105
For example, a material that satisfies at least one of the conditions of low dust generation and a low coefficient of friction to form a friction surface with the spindle 91 made of stainless steel, for example, a resin such as vinyl chloride and polypropylene, It is preferably formed of rubber or the like. These resins, such as vinyl chloride and polypropylene, are used to form the SUS
Is lower than that of Al constituting the disk main body 104, and has a so-called tenacity to a force that tears off the bush 105 due to friction of the spindle 91. In addition, the bush 105 made of the resin is softer than the spindle 91 and can prevent the spindle 91 from being damaged.

In addition, as a material of the bush 105, a material constituting the disk main body 104, for example, a metal material harder than Al, if it has a higher abrasion resistance than Al and has a low dust generation property, is used. It is also possible to form with.

Such a bush 105 is mounted in an opening 104a (having a diameter larger than the insertion hole 100) formed in the center of the disk main body 104, and the disks D to be stacked are stacked.
The thickness of the bush 105 is smaller than that of the disk main body 104 so as not to come into contact with the disk body 104. Here, bush 1
In the case where the material 05 is formed of a flexible material such as the above-mentioned resin or hard rubber, the convex portion 106 (or concave portion) is formed on the inner peripheral surface of the opening 104a, and the concave portion is formed on the outer peripheral surface of the bush 105. 107 (or convex portions) are formed. By fitting these convex portions 106 and concave portions 107, the bush 1
05 from the opening 104a is prevented. Also,
When the bush 105 is formed of a non-flexible material such as a metal, the bush 105 is fitted to the opening 104a with a predetermined tolerance. By the way, this bush 105
It is possible to replace only the bush 105 in the rigid disk G by making it so that it is not easily dropped from the opening 104a and can be removed from the opening 104a, that is, by making the bush 105 detachable.

The rigid disk G is formed with a plurality of circular through holes (air holding portions, adhesion preventing means, adhesion preventing portions) 108 which penetrate vertically, for example, in order to prevent adhesion. The through-holes 108 hold air therein, so that even when disks D and other rigid disks G located one above the other are stacked, air exists between the two and a vacuum state is created between them. The purpose is to prevent contact. The number of the through-holes 108 is not limited to the illustrated one. The number and position of the through-holes 108 may be increased or decreased, and the shape of each of the through-holes 108 may be other than circular. Further, if it is possible to prevent the disk D or the other rigid disk G positioned above and below from being in a vacuum state and to prevent the disks from sticking to each other, a groove extending in the radial direction or the circumferential direction is formed on the surface of the rigid disk G. It is also conceivable to take measures such as forming a large number of projections that come into contact with the disk D, or forming fine irregularities by blasting the surface. However, the original purpose of using the rigid disk G,
In other words, for the purpose of spreading the cationic UV-curable composition while the disc D is placed on a flat surface, holes or grooves other than the through-holes 108 or the numerous protrusions are formed. Even if a process such as blasting or the like is performed, the surface of the rigid disk G, more specifically, the portion that contacts the disk D and supports the disk D needs to have a predetermined flatness.

Means for preventing the rigid disk G from adhering,
As the adhesion preventing portion, the rigid disk G may be provided with a coating as an antistatic treatment on at least portions of the upper and lower surfaces 101U and 101L that contact the disk D. Specific examples thereof include conductive carbon, tin oxide,
A coating containing a conductive substance such as antimony oxide, indium oxide, and metal powder, and a coating of a conductive polymer are suitable. The coating is made of rigid disc G
As long as the antistatic effect of the surface can be obtained, there is no problem even if another type of coating is used. Further, in addition to the above processing, at least portions of the upper and lower surfaces 101U and 101L that contact the disk D are added to the rigid disk G.
For example, ethylene tetrafluoride (so-called Teflon: registered trademark)
May be applied. By coating with tetrafluoroethylene, friction between the rigid disk G and another rigid disk G or disk D is reduced, an adhesion preventing effect is obtained, and dust generation due to friction can be prevented.

In the disk manufacturing apparatus A having the above configuration, disks D and rigid disks G are alternately stacked,
By spreading the disk D on the flat surface of the rigid disk G, the occurrence of warpage can be suppressed. When the rigid disk G is used in this manner, the bush 10
Since the rigid disk G is provided, it is possible to prevent the rigid disk G side from being scraped due to friction with the spindle 91 when the rigid disk G is inserted into and removed from the spindle 91, and to reduce generated foreign matter. As a result, it is possible to reduce the occurrence of defects such as the attachment of foreign matter to the manufactured disk D, and to improve the quality. Moreover, this bush 10
The bush 105 can be replaced with a new one when the bush 105 is worn out due to long-term use by making the disk 5 detachable from the disk main body 104, and the replacement is performed on the spindle 91 side. This method is easier and lower in cost than when the method is used.

Further, by forming a through hole 108 in the rigid disk G or coating the surface thereof with ethylene tetrafluoride or the like, another rigid disk G (another disk member) or a disk can be formed on the rigid disk G. (Other disk members) D can be prevented from sticking. This allows
At the take-out position P3 and the pay-out position P6, it is prevented that the lower rigid disk G is taken out together when the disk D is taken out, or that the lower disk D is taken out together when the rigid disc G is taken out. it can. Further, at the payout position P6, when only the rigid disks G are stacked, for example, when the disk manufacturing apparatus A is started, when the uppermost rigid disk G is removed, the rigid disk G immediately below the uppermost rigid disk G is also removed. It can be prevented from being lost. That is, in this way, it is possible to prevent the rigid disc G or the disc D from being taken in two pieces, suppress the abnormal stop of the disc manufacturing apparatus A, and improve the operation rate of the apparatus and the product production efficiency.

In the above embodiment, the rigid disk G is provided with the bush 105 for preventing the generation of foreign matter. However, at least one of the conditions that the dust generation is low and the friction coefficient is low. If one of the above conditions is satisfied, it is also possible to adopt a material other than those mentioned above. Naturally, the material of the spindle 91 is also S
The material is not limited to US, and may be other materials. The material of the bush 105 may be determined accordingly. Also, instead of mounting the bush 105 on the rigid disk G, the rigid disk G itself is formed with low dusting properties, low friction coefficient,
It may be made of a material satisfying at least one of the above conditions. Further, a friction surface of the rigid disk G with at least the spindle 91, that is, the insertion hole 100
May be subjected to a surface treatment such as plating or alumite having improved abrasion resistance. In addition, a friction reducing member such as a bearing can be provided on the inner peripheral surface of the insertion hole 100 of the rigid disk G.

By the way, from the viewpoint of preventing the generation of foreign matter due to the wear of the rigid disk G, for example, not the rigid disk G side but the spindle 91 side should have at least the condition of low dust generation and low friction coefficient. It is also possible to form with a material that satisfies one. For example,
The surface of the spindle 91 is coated with resin or the like, or a cover made of resin or the like is attached to the spindle 9.
It is attached to 1. As described above, by forming at least the surface of the spindle 91 with a material that satisfies the above conditions, an effect of preventing generation of foreign matter due to friction with the rigid disk G can be expected. However, when a resin coating or the like is applied to the spindle 91, the coating layer may be peeled off after long-term use,
There is a possibility that foreign matter is generated due to this, and repair at that time (it is necessary to finish the surface smoothly with a predetermined diameter) is also difficult. Also, a cover made of resin or the like is attached to the spindle 9.
In the case where the cover is mounted on the cover 1, if the cover is damaged, it takes time to replace the cover. Moreover, when the surface of the spindle 91 is formed of a soft material, the outer diameter of the spindle 91 may deviate from a predetermined dimensional accuracy. In this case, the disk substrates d1, d2
May be shifted. On the other hand, if the bush 105 is provided on the rigid disk G side and the bush 105 is detachable as in the above-described embodiment, the generation of foreign substances is suppressed, and when the bush 105 is worn out or damaged, the bush 105 is removed. Can be easily replaced for refreshing. Further, even if the bush 105 is worn, the accuracy of the outer diameter of the spindle 91 and the inner diameter of the hole of the disc D is not affected at all.
There is no displacement of the disk substrates d1 and d2 constituting the disk D, and the effect can be obtained also in this respect.

In addition, the configuration of each part of the disk manufacturing apparatus A, for example, the substrate input part 10, the drop irradiation part 20, the superposition part 30, the pressing part 40, the spreading part 50, the end face processing part 60,
Specific configurations of the end face hardening accelerating unit 70, the inspection identification unit 80, and the like may be appropriately changed to another configuration or may be selected from the above configurations to configure a disk manufacturing apparatus, without departing from the gist of the present invention. You can also. In addition, it goes without saying that the operations of the respective units described in the above-described embodiment may be performed in a different order or overlap each other in order to improve the cycle time. further,
The disc to be manufactured is not limited to DVD such as DVD-RAM and DVD-18, but may be any disc as long as two disc substrates are bonded together.

Other than this, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-mentioned configurations may be selectively combined as appropriate. No.

[0059]

As described above, according to the present invention,
By using a rigid disk when spreading the ultraviolet curable composition interposed between two disk substrates,
A disk with reduced warpage can be manufactured. In addition, by forming the contact surface of the rigid disk with the spindle using a material with low dusting properties or a low friction material, the generation of foreign matter from the rigid disk due to friction with the spindle can be suppressed, and the incidence of defective products can be reduced. Thus, the production efficiency of the disc can be improved. Moreover, since the bush member is formed of a low friction member and is detachable from the disk body of the rigid disk, the bush member can be easily exchanged, and the maintainability can be improved. In addition, if a rigid disk is provided with an adhesion preventing means by forming an air holding portion or performing an antistatic treatment or the like, the rigid disk can be in close contact with another disk member such as another rigid disk or a disk. It is possible to prevent the occurrence of a so-called rigid disc or two-disc taking of a disc. As a result, it is possible to improve the operation rate of the apparatus and increase the disk production efficiency.

[Brief description of the drawings]

FIG. 1 is a layout diagram for explaining an overall configuration of a disk manufacturing apparatus according to an embodiment.

FIG. 2 is a view showing a step of dropping a cationic ultraviolet curable composition irradiated with ultraviolet light onto a disk substrate.

FIG. 3 is a view showing a step of superposing two disk substrates.

FIG. 4 is a view showing a state where a disk is pressed to first spread a cationic ultraviolet curable composition.

FIG. 5 is a view showing a process of alternately stacking disks and rigid disks.

FIG. 6 is a diagram showing a state in which only rigid disks are stacked.

FIG. 7 is a view showing a step of accelerating hardening of the end face of the disk.

FIG. 8 is a plan view and a sectional view showing an example of a rigid disk.

[Explanation of symbols]

10: substrate input section, 20: drop irradiation section (coating means), 23
... Drop irradiation device, 30... Overlapping portion (overlapping means), 40... Pressing portion, 50... Spreading portion (spreading device, spreading means), 60.
... Inspection and sorting unit, 91 ... Spindle, 100 ... Insertion hole
(Hole), 101U, 101L ... upper and lower surfaces (flat surface, regulating part),
104: disk body, 104a: opening, 105: bush (low friction member), 108: through-hole (air holding unit, adhesion preventing means, adhesion preventing unit), A: disk manufacturing apparatus, D
... Discs (other disc members), d1, d2 ... Disc substrates, G ... Rigid discs (Other disc members)

Claims (11)

[Claims] 1. An ultraviolet-curable composition interposed between two disk substrates constituting a disk, and
A rigid disk stacked on the disk to regulate the surface of the disk, comprising: a disk main body having an opening formed in the center; and a spindle detachably provided in the opening to hold the rigid disk. And a bush member forming a hole into which the bush member is inserted. Friction generated between the bush member and the spindle is lower than friction between a material forming the disk body and a material forming the spindle. Thus, the rigid disk is characterized in that the bush member is formed of a low friction member. 2. The rigid disk according to claim 1, wherein said low friction member is made of resin. 3. The rigid disk according to claim 1, further comprising an adhesion preventing means for preventing adhesion to the disk. 4. An apparatus for spreading an ultraviolet-curable composition of a disk having an ultraviolet-curable composition interposed between two disk substrates, wherein the apparatus has an insertion hole at a center portion thereof, A rigid disk alternately stacked with a disk, and the disk and the rigid disk are held by being inserted into a hole formed in the center of the disk and the insertion hole of the rigid disk, and provided in a vertical state. A spindle, wherein an inner peripheral surface of the insertion hole serving as a contact surface of the rigid disk with the spindle is formed of a material having low dust generation due to friction with the spindle. . 5. The spreading device according to claim 4, wherein the insertion hole of the rigid disk is formed of a material softer than the spindle. 6. A dropping step of dropping the cationic UV-curable composition on a disk substrate in a ring shape, an ultraviolet irradiation step of irradiating the cationic UV-curable composition during dropping with ultraviolet rays, A laminating step of laminating another disk substrate on the surface on which the cationic ultraviolet curable composition has been dropped to obtain one disk, and alternately laminating the disk and a rigid disk having flat upper and lower surfaces A laminating step of holding the disk.In the laminating step, a spindle is inserted into a hole formed at the center of each of the disk and the rigid disk, and the hole of the rigid disk is caused to frictionally contact the spindle. A method for manufacturing a disc, characterized in that the disc is formed of a material having low dusting properties. 7. A rigid disk having flat surfaces on the upper and lower sides and used by being stacked on another disk member, wherein said rigid disk is provided with an adhesion preventing means for preventing the disk member from being in close contact with said other disk member. Rigid disk. 8. The rigid disk according to claim 7, wherein an air holding portion that holds air between the flat surface and the other disk member is formed as the adhesion preventing means. 9. The flattened surface is subjected to an antistatic treatment as the adhesion preventing means.
Or a rigid disc according to 8. 10. The rigid disk according to claim 1, wherein said rigid disk is coated with ethylene tetrafluoride. 11. A coating means for applying a cationic ultraviolet curable composition irradiated with ultraviolet rays to a disk substrate, and superposing said disk substrate coated with said cationic ultraviolet curable composition on another disk substrate. Superimposing means, a disk obtained by superimposing the disk substrate on the other disk substrate, into a rigid disk having a regulating portion for regulating warpage of the disk and an adhesion preventing portion for preventing adhesion of the disk. Spreading means for stacking and spreading the cationic ultraviolet curable composition between the disk substrate and the other disk substrate.