JPH11273162A - Method and apparatus for manufacturing optical bonded disc - Google Patents

Abstract

(57) Abstract: An optical bonding disc that can stably produce a large quantity of optically bonded discs with good tilt and stable even with a single-sided two-layer or double-sided one-layer optically bonded disc. A method for manufacturing a disk is provided. SOLUTION: The present invention relates to a method of manufacturing an optical bonded disk which is placed on a disk holding table 11 with an ultraviolet-curable adhesive interposed between a pair of single-sided disks 1A and 1B, and is irradiated with ultraviolet light for bonding. The temperature of the disk holder 11 is adjusted so that the one-sided disk 1A in contact with the disk holder 11 is equal in temperature to the other one-sided disk 1B, and then the pair of single-sided disks 1 is irradiated with ultraviolet rays.
The ultraviolet curable adhesive between A and 1B is cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to audio information,
Video information, or a method for manufacturing a bonded disc that optically records or reproduces normal data and a device therefor, in particular, using an energy ray-curable resin such as an ultraviolet-curable resin as an adhesive, and irradiating energy rays. The present invention relates to a method and an apparatus for manufacturing an optically bonded disk.

[Prior art]

Conventionally, single-sided single-layer discs and double-sided
2. Description of the Related Art An optical bonded disc having a configuration in which recording information of a bonded disc such as a layer disc is read from each surface side is known.

[0003] In order to manufacture such an optically bonded disk in which two single-sided disks are bonded on the front and back,
In general, first, a transparent disk base such as polycarbonate having information pits formed by injection molding is prepared.

[0004] Next, a reflective film of aluminum or the like is formed on the surface of the pit of the formed disk by sputtering or the like to form a single-sided single plate. An ultraviolet curable resin is applied in a donut shape. Thereafter, the other veneer (a single-sided single-layer disk does not require a reflective film to be formed, ie, is used as a transparent substrate) to be bonded to the veneer on one side coated with the ultraviolet curable resin. ) Are overlapped, and they are rotated to stretch the resin (adhesive) over the entire surface of the disk. The so-called spinner process results in a bonded state. In this state, ultraviolet rays are irradiated from one or both of the disks to cure and fix the resin.

[0005] A bonded disk called a single-sided dual-layer disk is obtained by bonding a transparent disk substrate with a semi-transparent film formed thereon and a reflective film such as aluminum on a laminated substrate. This is a disk configured to read information from the substrate side of the translucent film, and is also manufactured by the same method.

In this type of bonding method using an ultraviolet curable resin or the like, since the resin before curing is in a liquid state, the flatness (unwarped state) of the disk is maintained during curing. Unless corrective means such as being sandwiched between flat glass plates is taken, a large tilt will occur in the disc after bonding and curing.

In order to solve this problem, the present applicant firstly
As disclosed in Japanese Patent Application No. 8-137084, the inner and outer sides of the stack ring of the disk are vacuum-adsorbed in a ring shape without being sandwiched by glass, and the other parts are stuck on a flat surface of the same level, and the lower disk is attached. It has been proposed to provide a holding means with a holding and correcting structure. According to this, a great effect can be obtained in reducing the tilt.

On the other hand, with respect to the curing of the resin (adhesive), in the case of a single-sided single-layer disc, ultraviolet rays are irradiated from the transparent substrate side on which a reflective film or the like is not formed. Cures instantaneously as it reaches the adhesive. By this instant curing, a flat disk can be obtained as corrected by the disk holding means.

[0009]

However, one side 2
In the case of a layer (a reflective film is formed on one single-sided disk and a translucent film is formed on the other single-sided disk), a translucent film is formed on the disk to be irradiated with ultraviolet light, and the translucent film is formed. 10-30% of the irradiated ultraviolet light because it is transmitted
Only a degree can reach the adhesive.

In the case of a double-sided single-layer disc (a pair of single-sided discs each having a reflective film formed thereon), a reflective film is formed on the disk to be irradiated with ultraviolet light, and the light is transmitted through the reflective film. Only about 0.5-3% can reach the adhesive.

For this reason, in the case of a single-sided double-layer disc or a double-sided single-layer disc, a larger amount of ultraviolet rays must be irradiated than in the case of a single-sided single-layer disc. However, since the output of the irradiator is limited, it is generally used. The irradiation time will be increased. For this reason, the composition is not instantaneously cured as in a single-sided single-layer disk, but is cured relatively slowly from a portion near the ultraviolet light source, that is, from the irradiation side.

[0012] In the lamination at the time of such a gentle curing, the irradiation side substrate absorbs the infrared ray irradiated together with the ultraviolet ray from the ultraviolet ray irradiator, and the substrate is flattened by the disk holding portion while the substrate is expanded. Will be cured after bonding. Therefore, when the disk is taken out from the holding portion and the expanded substrate side cools and returns to the original temperature, the expanded substrate contracts, resulting in a warp in that direction. In other words, a concave warp will be generated on the irradiation surface side, and the size of the irradiation surface is large,
That is, in order of the ultraviolet irradiation time, the order is one layer on both sides (transmitting through the reflective film), two layers on one side (transmitting through the translucent film), and a single-sided single-layer disc (transmitting through the transparent substrate so that it is hardly affected). It was extremely difficult to obtain a stable and stable bonded disc of a two-layer or double-sided single-layer disc with good tilt.

Accordingly, the present invention is to provide a large-scale and stable production of a stable optically bonded disc having a good tilt not only with a single-sided single-layer but also a single-sided two-layer or double-sided single-layer optically bonded disc. It is an object of the present invention to provide a method and an apparatus for manufacturing an optical bonded disc which can be used.

[0014]

In order to achieve the above object, a method for manufacturing an optical bonded disc according to the first aspect of the present invention comprises:
An optical bonding disk manufacturing method comprising: placing an energy ray-curable adhesive between a pair of single-sided disks, placing the adhesive on a disk holding table, and irradiating an energy ray for curing the adhesive to bond the adhesive. Adjusting the temperature of the disk holder so that one single-sided disk in contact with the disk holder is equal in temperature to the other single-sided disk,
Thereafter, an energy ray is irradiated to cure the energy ray-curable adhesive between the pair of single-sided disks. In this configuration, the temperature difference between the single-sided disk on the ultraviolet irradiation side and the single-sided disk held on the disk holding table can be reduced, so that the pair of single-sided disks expands evenly and the shrinkage amounts also equal. In addition, it is possible to prevent the occurrence of warpage after bonding.

According to a second aspect of the present invention, there is provided a method of manufacturing an optically bonded disk according to the first aspect, wherein the irradiation of the energy beam is performed through a translucent film. Features. In this configuration, a favorable tilt can be obtained even when the energy of the energy ray is attenuated by the translucent film and the irradiation time increases.

According to a third aspect of the present invention, there is provided a method of manufacturing an optically bonded disk according to the first aspect, wherein the irradiation of the energy beam is performed through a reflective film. And With this configuration, a good tilt can be obtained even if the energy of the energy rays is attenuated by the reflective film and the irradiation time increases.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an optical bonded disc according to the first aspect, wherein the irradiation of the energy ray is performed through a printed layer. And In this configuration,
A good tilt can be obtained even if the irradiation time increases due to the energy of the energy ray being attenuated by the printing layer.

According to a fifth aspect of the present invention, there is provided a method of manufacturing an optical bonded disc according to the first aspect, wherein the temperature adjustment is performed by supplying a temperature adjusting fluid to the disk holding table. It is characterized by being distributed inside. With this configuration, the temperature distribution of the disk holder becomes more uniform than when the temperature adjusting fluid is not circulated inside the disk holder.

According to a sixth aspect of the present invention, in the method of manufacturing an optical bonded disc according to the first aspect of the present invention, the temperature adjustment is performed by supplying a temperature adjusting fluid to the disk holding table. It is characterized in that it is carried out by circulating adjacent to the outer circumference. In this configuration, a conventional disk holding table can be used.

Further, in the optical laminated disk manufacturing apparatus according to the present invention, an energy beam-curable adhesive is interposed between a pair of single-sided disks, and the disk is mounted on a disk holding table.
In an optically bonded disk manufacturing apparatus for bonding by irradiating the adhesive with an energy ray for curing the adhesive, the disk holding unit may be configured such that one single-sided disk that is in contact with the disk holding table is equal in temperature to the other single-sided disk. A flow path of a temperature adjusting fluid for adjusting the temperature of the table with the temperature adjusting fluid is provided in the disk holding table. In this configuration, the temperature difference between the single-sided disk on the ultraviolet irradiation side and the single-sided disk held on the disk holding table can be reduced, so that the pair of single-sided disks expands evenly and the shrinkage amounts also equal. In addition, it is possible to prevent the occurrence of warpage after bonding.

According to an eighth aspect of the present invention, in the apparatus for manufacturing an optical bonded disc according to the seventh aspect, the flow path is provided inside the disk holding table. It is characterized by. With this configuration, the temperature distribution of the disk holder becomes more uniform than when the temperature adjusting fluid is not circulated inside the disk holder.

According to a ninth aspect of the present invention, in the apparatus for manufacturing an optically bonded disk according to the seventh aspect, the flow path is provided on an outer periphery of the disk holder. It is characterized by. In this configuration, a conventional disk holding table can be used.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a disk holder provided in the optical bonded disk manufacturing apparatus according to the present invention, and FIG. 2 is a schematic plan view of the entire optical bonded disk manufacturing apparatus.

As shown in FIG. 1, the disk holder 11
Is located on the surface (the surface facing the bonding surface) between the inner circumference of the recording area of the single-sided disk 1A to be attracted or the area corresponding to the recording area and the outer circumference of the stack ring 21 which is a ring-shaped convex for integration. An outer ring-shaped portion 11a that abuts, an inner ring-shaped portion 11b that abuts on the inner peripheral surface of the stack ring 21, and these ring-shaped portions 11a and 11b.
It has a relief groove 11i of the stack ring 21 provided therebetween, a vacuum suction channel 11c, and a reflection mirror portion 11k for efficiently irradiating ultraviolet rays as energy rays.

The vacuum suction channel 11c has an opening 11d.
Is connected to a vacuum pump (not shown). Therefore, by operating the vacuum pump, the outer and inner ring-shaped portions 11a and 11b can adsorb the outer peripheral side and the inner peripheral side of the stack ring 21 on the disk surface, thereby holding the single-sided disk 1A flat. can do. In the drawing, reference numeral 22 denotes a center hole of the single-sided disk 1A, and reference numeral 11j denotes a spindle inserted into the center hole 22.

The disk holder 11 is provided with a temperature control fluid flow path 11e for adjusting the temperature of the disk holder 11. The flow path 11e is provided in the disk holder 1
An inlet-side vertical flow path 11f formed at a lower portion of the lower surface of the disk holder 1 near the outer periphery of the disk holder 11 and having a predetermined length above the opening 11m, and is bored toward the center of the disk holder 11 continuously to the vertical flow path 11f. It comprises a horizontal flow path 11g, and an outlet-side vertical flow path 11h drilled to the opening 11n on the lower surface of the disk holding base 11 continuously to the horizontal flow path 11g. A temperature control fluid, for example, a gas such as air or helium, or a fluid such as water or oil flows through the channel 11e.

The opening 11m is connected to a temperature control fluid source 52 via a flow control valve 51. The temperature of the temperature adjusting fluid source 52 is adjusted by the temperature adjusting means 53. A control signal to be described later is transmitted from the control unit 54 to the temperature adjusting unit 53.

As shown in FIG. 2, the optically bonded disk manufacturing apparatus 30 includes a disk supply position 31.
, A disk supply arm 32, a spinner 33, a discharge nozzle 34, and a bonded disk transfer arm 35.
1, a UV lamp unit transfer arm 37 provided with the disk holding table 11 of FIG. 1, a UV lamp unit 38, a take-out arm 40, and a disk discharge position 41. Disc holder 1 on UV lamp transfer arm 37
FIGS. 3 (a) and 3 (b) show a state in which No. 1 is mounted.

In such an apparatus for manufacturing an optical laminated disk, first, the single-sided disk 1A with the pit surface facing upward is supplied to the disk supply position 31. Next, the lower single-sided disk 1A with the pit surface facing upward is transferred by the disk supply arm 32 from the disk supply position 31 onto the rotary table of the spinner 33.

Next, the spinner head 12 of the spinner section 33 is lowered. When the spinner head 12 is lowered, the upper single-sided disk 1A is moved from the upper side of the lower single-sided disk 1A.
It moves to the upper position by the thickness of B and the margin.

Next, the lower single-sided disk 1A transferred to the spinner section 33 is rotated by a motor (not shown), and an ultraviolet ray curable adhesive (resin), which is an energy ray curable adhesive, is applied by a discharge nozzle. At this time, it is desirable that the rotation speed of the disk is as low as 30 to 100 rpm.

Next, the upper single-sided disk 1B with the pit face down is supplied to the disk supply position 31. Next, the upper single-sided disk 1B is moved and mounted by the disk supply arm 32 on the lower single-sided disk 1A coated with the ultraviolet curing adhesive.

Next, the rotary table is set at 2000 to 400
Single-sided discs 1A, 1B by rotating at a high rotation of 0 rpm
The adhesive between them is spread with a predetermined thickness. Next, the spinner head 12 of the spinner section 33 is raised. Next, the wafer is transferred to a bonding station by the bonding disk transfer arm 35 and mounted on the disk holding table 11.

Next, the bonded single-sided disks 1A and 1B placed on the disk holding table 11 are transferred by the UV lamp transfer arm 37 while the ultraviolet lamp 3
8 irradiates ultraviolet rays. The irradiation of the ultraviolet rays cures the ultraviolet-curable adhesive.

When irradiating the ultraviolet rays, the temperature adjusting fluid is applied to the disk holder 11 by the amount of the ultraviolet rays (illuminance and time).
The temperature and / or the flow rate are adjusted appropriately according to the flow rate, and the temperature of the one-sided disk 1A in contact with the disk holding table 11 is adjusted to match the temperature at which the one-sided disk 1B on the side irradiated with the ultraviolet rays rises by the irradiation. By adjusting (at this time, both disks 1A and 1B expand to the same extent), they can be cooled after hardening and can be prevented from warping to one side like bimetal when contracted.

As another method, as shown in FIG. 1, during this ultraviolet irradiation, the temperature of the ultraviolet irradiation side, ie, the upper disk substrate 1B is monitored by the first temperature sensor 55a, and the second temperature sensor is used. The temperature of the disk holder 11 is monitored by 55b. Then, the control unit 54
When the temperature of the upper disk substrate 1B is higher than that of the disk holder 11, a signal for raising the temperature is sent to the temperature adjusting means 53, and the temperature of the upper disk substrate 1B is lower than that of the disk holder 11. In this case, a signal for lowering the temperature is sent to the temperature adjusting means 53. The temperature adjusting means 53 to which the signal for increasing the temperature is input raises the temperature of the temperature adjusting fluid, and raises the temperature of the disk holding base 11 by the raised temperature adjusting fluid so that the temperature becomes equal to that of the upper disk substrate 1B. . Further, the temperature adjusting means 53 to which the signal for temperature lowering is input lowers the temperature of the temperature adjusting fluid, and lowers the temperature of the disk holding base 11 by the lowered temperature adjusting fluid so that the temperature becomes equal to that of the upper disk substrate 1B. In this way, the temperature of the upper disk substrate 1B and the temperature of the disk holding table 11 are made substantially equal, whereby the temperature of the lower disk substrate 1A mounted on the upper surface of the disk holding table 11 is reduced. It is almost equal to the temperature of Therefore, since the upper disk substrate 1B and the lower disk substrate 1A are made of the same light-transmitting material, for example, polycarbonate, they expand by the same degree and contract by the same degree upon cooling, so that the bonded disks warp after curing. Nothing.

As another method, as shown in FIG. 1, during this ultraviolet irradiation, the temperature of the ultraviolet irradiation side, that is, the upper disk substrate 1B is monitored by the first temperature sensor 55a, and the second temperature is monitored. The temperature of the disk holder 11 is monitored by the sensor 55b. Then, when the temperature of the upper disk substrate is higher than that of the disk holding table 11, the control unit sends an open signal to the flow rate adjustment valve 51,
When the temperature of the upper disk substrate 1B is lower than that of the disk holding table 11, a close signal is sent to the temperature adjusting means 53. The flow control valve 51, to which the open signal is input, increases the flow rate of the temperature control fluid, and raises the temperature of the disk holding base 11 by the increased temperature control fluid so that the temperature becomes equal to that of the upper disk substrate. The flow control valve 51 to which the closing signal has been input decreases the flow rate of the temperature control fluid, and lowers the temperature of the disk holding base 11 with the reduced temperature control fluid so that the temperature becomes equal to that of the upper disk substrate 1B. In this way, the temperature of the upper disk substrate 1B and the temperature of the disk holding table 11 are made substantially equal, whereby the temperature of the lower disk substrate 1A mounted on the upper surface of the disk holding table 11 is reduced. It is almost equal to the temperature of Therefore, the upper disk substrate 1B and the lower disk substrate 1A
Is the same translucent material, for example, polycarbonate, so that it expands to the same extent and contracts during cooling, so that the bonded disc does not warp after curing.

Although FIG. 1 shows both the temperature control means 53 for raising and lowering the temperature of the temperature control fluid source 52 and the flow control valve 51 for controlling the temperature by increasing or decreasing the flow rate, as shown in FIG. Alternatively, the temperature may be adjusted by either one of them, as described above.

Next, when the UV lamp transfer arm 37 reaches the position D, the single-sided discs 1A and 1B having the UV-curable adhesive cured are transferred to the disc discharge position 41 by the take-out arm 40. Is done.

Next, the single-sided disks 1A and 1B bonded together are taken out from the ejection position. Next, the UV lamp transfer arm 37 is transported to the position C.
Next, the next disk supplied to the UV lamp unit transfer arm 37 is on standby.

In the above embodiment, since the vicinity of both sides of the stack ring 21, which is a bending margin, is sucked, the warpage of the single-sided disks 1A and 1B can be efficiently corrected. That is, since the single-sided disk 1A placed on the disk holding base 11 can be held flat, the single-sided disk 1B placed on and bonded to the disk holding table 11 is also flattened by the tension of the ultraviolet curing adhesive.

As described above, it is possible to reduce the temperature difference between the upper single-sided disk on the ultraviolet irradiation side and the lower single-sided disk on the disk holder 11 side, so that the difference between the one single-sided disk and the other single-sided disk is reduced. Non-uniform expansion and contraction can be prevented, and the occurrence of warpage after bonding can be prevented. When the ultraviolet irradiation is performed simultaneously from the surfaces of both disks, the temperature rises of both disks become almost equal, but the problem of the method of correcting the disks (problem of the method of sandwiching between the glasses of Japanese Patent Application No. 9-56319). And a plurality of ultraviolet irradiators are required, and the apparatus becomes large-scale. In contrast, the method of the present invention can eliminate such a problem because the ultraviolet irradiation can be performed from one side.

In the above embodiment, the temperature control flow path is provided inside the disk holding base 11, but the temperature control flow path may be formed by, for example, bringing a pipe into contact with these outer peripheries and drawing around. . Also, the case where an ultraviolet-curable adhesive is used as the adhesive has been described, but an adhesive that cures with energy rays other than ultraviolet light may be used.

The following results were obtained when an experiment was performed on a DVD under the following conditions. In the following, the integrated light amount is a value measured on the surface of the disk holding table 11.

(First Embodiment) The first embodiment is for a single-sided, double-layer disc.・ Ultraviolet irradiator: UVA-40, manufactured by USHIO Inc.
2/1 MNSC9-WJ02; lamp UVL-4001
M3-N1 Adhesive (resin): XNR55, manufactured by Nagase Chiba Co., Ltd.
20 ・ Adhesive application amount: average film thickness of about 50 μm ・ Translucent film: Si160 Å (365 nm)
The wavelength transmittance is about 15%), and UV irradiation is performed from this surface. -Ultraviolet irradiation dose: 1. At the lamp output of 120 W / cm.
7 seconds (integrated light amount at 365 nm wavelength = 620 mJ / cm2)

[0046]

[Table 1]

As shown in Table 1, according to the first embodiment, the maximum tilt angle was significantly reduced from -0.6 degrees in the conventional method to -0.2 degrees.

(Second Embodiment) The second embodiment is for a double-sided single-layer disc.・ Ultraviolet irradiator: UVA-40, manufactured by USHIO Inc.
2/1 MNSC9-WJ02; lamp UVL-4001
M3-N1 Adhesive (resin): XNR55, manufactured by Nagase Chiba Co., Ltd.
20 ・ The same coating amount: average film thickness of about 50 μm ・ Reflective film: Al 550 Å (365 nm)
The average transmittance of the wavelength is about 2.5%), and the UV irradiation is performed from this surface. -UV irradiation amount: 1. At the lamp output of 160 W / cm.
5 seconds (integrated light quantity at 365 nm wavelength = 1220 mJ / square centimeter)

[0049]

[Table 2]

As shown in Table 2, according to the second embodiment, the maximum tilt angle was significantly reduced from -1.3 degrees in the conventional method to -0.4 degrees. In the above embodiment, the case where the ultraviolet ray is irradiated through the reflection film or the translucent film has been described. However, the case where the ultraviolet ray is irradiated through an opaque body such as a print layer is also effective.

The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the gist of the present invention.

[0052]

As is apparent from the above description, according to the method and the apparatus for manufacturing an optical bonded disk of the present invention, the temperature of the single-sided disk on the ultraviolet irradiation side and the single-sided disk held on the disk holding table are increased. Since the difference can be reduced, the pair of single-sided disks expand evenly and the shrinkage amounts are also equal, so that it is possible to prevent the occurrence of warpage after bonding. In addition, when the temperature adjusting fluid is circulated inside the disk holder, the temperature distribution of the disk holder becomes more uniform. When the temperature distribution fluid is circulated around the outer periphery of the disk holder, a conventional disk holder can be used.

[Brief description of the drawings]

FIG. 1 is a view showing a disk holder for ultraviolet irradiation of an optical bonded disk manufacturing apparatus according to the present invention.

FIG. 2 is a schematic plan view showing an apparatus for manufacturing an optical bonded disc according to the present invention.

FIGS. 3A and 3B show the mounting of the disk holding table on the UV lamp transfer arm, wherein FIG. 3A is a plan view, and FIG. 3B is a sectional view taken along line aa.

[Explanation of symbols]

 1A Single-sided disk 1B Single-sided disk 11 Disk holder 11e Flow path

Claims (9)

[Claims] 1. An optical bonding disk which is placed on a disk holding table with an energy ray-curable adhesive interposed between a pair of single-sided disks and is irradiated with an energy ray for curing the adhesive and bonded. In the manufacturing method, the temperature of the disk holder is adjusted such that one single-sided disk that is in contact with the disk holder is equal in temperature to the other single-sided disk, and thereafter, the pair of single-sided disks is irradiated with energy rays. A method for manufacturing an optically bonded disk, comprising curing an energy-ray-curable adhesive between disks. 2. The method according to claim 1, wherein the irradiation of the energy beam is performed through a translucent film. 3. The method according to claim 1, wherein the irradiation of the energy beam is performed through a reflective film. 4. The method according to claim 1, wherein the irradiation of the energy beam is performed through a printing layer. 5. The method according to claim 1, wherein the temperature adjustment is performed by flowing a temperature adjusting fluid through the inside of the disk holder. 6. The method according to claim 1, wherein the temperature is adjusted by flowing a temperature adjusting fluid adjacent to an outer periphery of the disk holder. 7. An optical bonding disk which is placed on a disk holding table with an energy ray-curable adhesive interposed between a pair of single-sided disks, and is irradiated with an energy ray for curing the adhesive and bonded. In the manufacturing apparatus, the one-sided disk that is in contact with the disk holder is made to have the same temperature as the other single-sided disk. An optical bonded disc manufacturing apparatus provided on a disc holder. 8. The apparatus according to claim 7, wherein the flow path is provided inside the disk holding table. 9. The apparatus according to claim 7, wherein the flow path is provided on an outer periphery of the disk holding table.