JPH0944916A - Spreading device for optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive the splashing adhesive and to prevent the contamination of surroundings at the time of rotating both resin substrates at a high speed in a spreading stage at the time of producing optical disk. SOLUTION: This spreading device for optical disk is constituted to spread an adhesive R by superposing a second resin substrate U2 on a first resin substrate U1 via the adhesive R and integral rotating both. The device has a rotatable receiving table 1 on which the first resin substrate is placed and a cover member 2 which receives the adhesive R splashed by rotation. Consequently, the adhesive splashed outward at the time when the adhesive interposed between the first resin substrate and the second resin substrate is spread, is surely received and the splashing of the adhesive to the surroundings is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk spreading device, and more specifically, it is possible to rotate a first resin substrate and a second resin substrate, which are superposed with an adhesive interposed therebetween, to integrally rotate the adhesive. The present invention relates to a device for extending an optical disc to be extended.

[0002]

2. Description of the Related Art Today, computers are used in all fields, and development of capacity, speed, etc. is remarkable. In particular, the memory density of the memory body has been dramatically improved, and the effect of changing common sense in daily life is being exerted. Of the storage media, recording discs, especially optical discs,
It is compact and convenient to carry, and is used in many applications for storage.

The optical disk is preferably made of a disk-shaped substrate made of synthetic resin such as polycarbonate resin. A signal pit which is an information signal is recorded and provided on this resin substrate, and a reflective film such as aluminum is formed on the signal pit. A protective resin material such as an ultraviolet curable resin (commonly called a UV resin) is formed on the reflective film to protect the signal pits.

By the way, it is preferable that the thickness of the substrate is as thin as possible in order to increase the density of information and record signals.
0.6 mm is adopted from the viewpoint of manufacturing restrictions and strength. Since the standard of CD is about 1.2 mm in thickness, if it is attempted to match it, another resin substrate will be bonded to the above resin substrate.

For example, FIG. 7 shows a cross section of an optical disc in a state where two resin substrates are bonded together, where signal information is recorded only on one resin substrate. Optical disc 1
D is a resin obtained by bonding the first resin substrate 2D having the reflective film 3D and the protective resin material 4D formed on the signal pit and the second resin substrate 6D with the adhesive 5D and curing the same.

[0006] As described above, the one obtained by sticking two resin substrates together naturally has a sufficient strength. That is, 2
The optical discs bonded together have a high strength and are compliant with the mainstream CD standard, and are extremely advantageous from the viewpoint of versatility. Such an optical disc
The present inventors manufacture by the following method.
First, on the resin substrate (first resin substrate) on which signals are recorded,
An adhesive, for example, an ultraviolet curable resin is applied.

For coating in this case, a method using a coating roller, a discharge nozzle or the like is adopted. After the adhesive is applied to the first resin substrate, the second resin substrate is placed thereon. The two resin substrates placed and overlapped are rotated so that the adhesive is evenly spread. After being spread, the adhesive agent interposed between the two resin substrates is cured.

For example, when an ultraviolet curable resin is used as the adhesive, ultraviolet rays are applied during curing. When the adhesive is cured, the first resin substrate and the second resin substrate become
An optical disc that is surely integrated and firmly bonded can be obtained. By the way, the present inventors have adopted a method of rotating at a high speed in the extending step in the method of manufacturing by laminating optical discs in this way.
Due to the high speed rotation, the adhesive was scattered from both resin substrates to the outside to contaminate the surroundings.

In particular, the adhesive vigorously scatters in the outward direction at an accelerated state at the start of rotation. Also, if the material is scattered outside, it stains the surrounding area or remains scattered around on the floor. Then, the accumulated adhesive is hardened and hardened over time, which is extremely troublesome.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to overcoming the problems set forth above. That is, an object of the present invention is to prevent the contamination of the surroundings by receiving the adhesive that scatters when rotating both resin substrates at a high speed in the spreading process when manufacturing an optical disc, and to provide a spreading device therefor. Is.

[0011]

The inventors of the present invention have completed the present invention by providing a member for preventing the adhesive from scattering in order to solve the above problems.

That is, the present invention is (1) an optical disk spreading apparatus for stacking a second resin substrate on a first resin substrate via an adhesive and rotating them integrally to spread the adhesive. The optical disk spreading apparatus includes a rotatable pedestal on which the first resin substrate is placed, and a cover member that holds the adhesive scattered by the rotation.

Further, (2) the optical disk spreading apparatus is provided in which the cover member is arranged so as to surround the entire periphery of the both resin substrates.

Further, (3) the cradle is present in a vertically moving optical disk spreading device.

Further, (4) the cover member is present in the vertically extending optical disk spreading device.

Further, (5) the cover member is present in an optical disk spreading device having a discharge port for discharging the received adhesive.

Further, (6) there is an optical disk extending apparatus in which the cover member comprises a dome member and a bottom plate for receiving the dome member, and the dome member is detachable from the bottom plate.

Further, (7) the optical disk spreader in which the dome member is composed of an upper lid portion and a side wall portion, and the upper lid portion is removable from the side wall portion.

Further, (8) the lower surface of the upper lid portion is present in an optical disk extending device which is inclined.

Further, (9) the optical disk spreading apparatus is provided with a suction hole for sucking the adhesive agent in the boss portion provided in the center of the receiving table.

Further, (10) the optical disk spreading apparatus is provided with a suction hole for sucking and holding the resin substrate on the surface of the pedestal.

[0022]

According to the present invention, when the optical disc, that is, both resin substrates rotate, the adhesive scattered outward is reliably received by the cover member. The cover member prevents the adhesive from scattering and does not pollute the surrounding environment.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings. First, in order to see the position of the spreading device, a process of manufacturing the optical disc D will be schematically described.
FIGS. 6 (1) to 6 (5) schematically show steps of manufacturing an optical disc D by bonding two resin substrates together.

The steps will be briefly described below. here,
In the optical disc D, the information signal is recorded on the first resin substrate and the information signal is not recorded on the second resin substrate,
An information signal is recorded on the second resin substrate and is not recorded on the first resin substrate, or an information signal is recorded on both the first resin substrate and the second resin substrate.
There are two cases. It is also possible to use a different pedestal for each step.

First, the resin substrate U1 (first resin substrate) on which a signal is recorded is placed on the pedestal 1 (step 1). Here, the pedestal 1 has a boss portion for positioning the resin substrate in the center and is rotatable. Next, after the first resin substrate U1 is placed on the pedestal 1, the adhesive R such as an ultraviolet ray curable resin is applied on the first resin substrate (step 2).

When the adhesive is an ultraviolet curable resin, it is preferable that the application is performed by dropping the adhesive from the first resin substrate U1 with the nozzle N. For example, with the first resin substrate U1 rotated, the adhesive R is applied from the discharge nozzle N in a donut shape as shown in the figure. This donut-shaped application is advantageous from the viewpoint of preventing air inclusion, but since the details of this point are not essential to the present invention, they are omitted here. First resin substrate U1
Then, after the adhesive R is applied, the second resin substrate U2 is placed thereon (step 3).

The mounting method at this time is extremely important and has a great influence on the quality of the next step of spreading, but this is not the essence of the present invention, so it is omitted here. Next, after the second resin substrate U2 is placed on the first resin substrate U1, the pedestal C is rotated to integrally rotate the two at a high speed (several rpm) (step 4). That is,
By this rotation, the first resin substrate U1 and the second resin substrate U2
The adhesive intervening between and is spread evenly and evenly.

Further, this rotation has a function of blowing out the air enclosed in the state where both resin substrates are superposed. When the adhesive itself contains even a small amount of air bubbles, it is possible at the same time to let it completely escape by rotation. In this spreading step, due to high speed rotation, a considerable amount of the adhesive R among the adhesives R interposing on both resin substrates is scattered outward from the periphery of both resin substrates.
The spreading time is about several seconds, but the scattering of the adhesive to the outside is severe during the period of 1 to 2 seconds, which is the acceleration time when the adhesive is started to rotate at high speed. The spreading device of the present invention is used in this spreading step, and will be described in detail later.
After the adhesive R is spread, the adhesive is cured (step 5).

When the adhesive R is an ultraviolet curable resin, the adhesive R is cured by irradiating ultraviolet rays from above the second resin substrate U2 while stationary or rotating at a low speed. Incidentally, here, the ultraviolet rays are usually emitted by an ultraviolet ray irradiation source 18 having a reflecting mirror 19 behind them). Upon receiving the ultraviolet rays, the ultraviolet curable resin is cured, and the first resin substrate U1 and the second resin substrate U2 are surely integrated with each other, and a firmly bonded optical disc is completed. When the adhesive is a hot melt type adhesive, it is naturally cured without being irradiated with ultraviolet rays.
By going through the steps described above, the two resin substrates are bonded and integrated to form the optical disc D.

Thus, in the process of bonding both resin substrates, the first resin substrate U1 and the second resin substrate U2 are attached.
However, after being placed, by rotating the pedestal C, the two are integrally rotated at high speed to spread the adhesive,
The present invention is unique because it uses a special configuration for the spreading device.

The spreading device will be described below. FIG.
Shows the spreading device A. The spreading device A includes a pedestal 1 and a cover member 2. The cradle 1 includes a disk-shaped receiving plate 12 that directly receives an optical disk, a rotating shaft 14 provided on the disk-shaped receiving plate 12, and a support sleeve 17 that supports the rotating shaft 14. The support sleeve 17 comprises a bearing 15 to ensure the rotary shaft 14 of the disc-shaped support plate 12. The support sleeve 17 is installed on the base B to support the entire pedestal in a stable state.

A suction hole H1 is formed on the surface of the disk-shaped receiving plate 12,
Further, a space 13 is provided inside, and the space 13 communicates with a passage 16 provided at the center of the rotary shaft 14. The passage 16 of the rotary shaft 14 is open to a suction source (not shown), and suction control is performed here. The optical disc mounted on the disc-shaped receiving plate 12 is sequentially sucked by the suction source through the suction hole H1, the space 13 and the passage 16, and is securely held. A boss portion 11 is provided at the center of the disc-shaped receiving plate 12, and when the optical disc D is placed on the disc-shaped receiving plate 12, the boss portion 11 has a central hole. Positioning is ensured by fitting in.

A suction hole H2 is also formed in the boss portion 11 for the purpose of sucking the adhesive R interposed in the bonded portion of the optical disk so that the adhesive agent R is sufficiently spread even in the central portion. Suction is performed in order of suction hole H2 and rotary shaft 1.
4 by means of a suction source through the passage 16. At that time, the suction hole H3 is for inducing and introducing the atmosphere.

The suction holes H1 of the disc-shaped receiving plate 12 and the suction holes H2 of the boss portion 11 are shown as the same suction source, but the suction paths of both suction holes are different and the suction sources are different. Of course, it is also possible. These points have been separately filed in detail and will not be described here. On the other hand, a cover member 2 is arranged around the pedestal 1. The cover member 2 is for preventing the adhesive R from scattering, and is composed of a dome body 20 and a base 23, and the dome body 20 is separated into a side wall portion 22 and an upper lid portion 21.

As can be understood from FIGS. 1 and 3, the side wall portion 22 of the dome body 20 has a cylindrical shape, and the upper lid portion 2
1 is a donut shape. The dome body 20 is assembled by fitting the upper lid portion 21 into the upper groove 22A of the side wall portion 22, but in order to secure the coupling stability between them, the screw P1 is used.
It is good to fix it using the etc.

The base 23 is for receiving the dome body 20, and as will be described later, for receiving the adhesive that has fallen along the side wall portion 22 after the adhesive has been scattered from the optical disk. , For discharging to the outside. Therefore, a discharge port 26 is provided on the bottom surface of the bottom table 23, and an inclination S is provided to the discharge port 26 so that the adhesive that has propagated through the side wall portion 22 can easily flow. Further, a cylinder rod 25 is attached to the lower surface of the bottom stand 23, and the movement of this rod allows the entire cover member including the bottom stand to be moved up and down.

By the way, the dome body 20 and the base 23 are
The dome body 20 is fitted into each other such that the outer circumference of the dome body 20 is in contact with the inner circumference of the rising portion of the base 23. If the dome body 20 is held by the screw P2, both can be fixed more stably. As described above, in the spreading device A, the cover member 2 arranged around the pedestal 1 can accurately receive the adhesive R scattered around the pedestal 1 as the pedestal 1 rotates. Cover member 2
Moves up and down with respect to the pedestal 1, so that it can be disposed at a position for preventing scattering only when necessary.

Next, a mode in which the adhesive R such as an ultraviolet curable resin is spread by using this spreading device will be described. FIG.
It shows a procedure of using the spreading device A for spreading.
First, the first resin substrate U1 is placed on the pedestal 1, and an adhesive such as an ultraviolet curable resin is applied onto the first resin substrate U1,
Further, the first resin substrate U2 is placed (A) (B). At this time, the position of the upper end of the cover member 2 is lowered to a height of about the center position of the pedestal 1 and stands by (B).

Then, from this state (B), the cover member 2 starts to rise, and stops at a position slightly above the upper surface of the optical disk D of the receiving table 1 (C). Where cradle 1
Is rotated at a high speed, the adhesive agent interposed between the two resin substrates is spread and evenly spreads over the optical disc D. In this case, high speed rotation is performed for about several seconds when extending. At this time, the adhesive scatters substantially horizontally outward from the end surface of the rotating optical disc D by centrifugal force (D).

Since this adhesive is a fluid liquid, after it is ejected, it is dispersed in the vertical direction to some extent.
The scattered adhesive collides with the side wall surface 22 of the dome body 20 of the cover member 2 and drops along the side wall surface. Further, the dropped adhesive passes through the inclined surface S of the base 23 and is appropriately discharged from the discharge port 26. At this time, since the discharge port 26 communicates with a suction source (not shown), its discharge is promptly promoted. The position where the scattered adhesive is directly received is preferably received by the lower surface T of the upper lid portion 21.

This is because once it is received here, the momentum is relieved, and then it falls along the side wall surface 22 and the rebound of the adhesive agent disappears. However, this direct receiving position can be changed by adjusting the vertical movement of the cover member 2. On the other hand, when the adhesive scatters horizontally outwardly due to the high speed rotation, it is somewhat dispersed in the vertical direction as described above and dispersed.

Therefore, the adhesive which is dispersed in a slightly upward direction and is scattered is prevented by the upper lid portion 21 from protruding upward. The adhesive scattered and attached to the lower surface T of the upper lid 21 flows along the inclined surface of the lower surface T because of the inclination of the lower surface T, and then falls onto the bottom pedestal 23. As for the degree of inclination of the lower surface T, for example, as shown in FIG. 2B, there are a gentle inclination T1, a moderate inclination T2, a steep inclination T3, etc., and the upper lid portion 21 should be selected. Can be changed freely.

Further, the shape of the lower surface T can be formed in a curved surface in addition to the above-mentioned inclination. In this case, since the dispersion mode in the case of scattering varies depending on the rotation speed of the pedestal 1 and the viscosity of the adhesive, for example, the ultraviolet curable resin, a suitable one is used.

FIG. 5 shows a modification of the above-described spreading device in which the cover member 2 has a different structure. The cover member 2 is an integrated body,
As for the dome body 20 shown in FIG.
The side wall portion 22 and the bottom stand 23 correspond to one made of a uniform plate. The bent portion 27 is slightly inclined and has the same function as the upper lid portion 21 of the dome body 20 of FIG.

The scattered adhesive agent is received by the standing wall portion 28, but propagates through the standing wall portion 28 and falls down. Since the bottom plate portion 29 is inclined outward,
The adhesive collects in this inclined portion. And the outlet 26
Emitted from. The cover member 2 of this modification can also be moved up and down by the cylinder rod 25.

Although the present invention has been described above, the present invention is not limited to the embodiments, and various modifications can be made without departing from the essence thereof. For example, the shape of the dome body can be changed within the range where the purpose is achieved, and the same can be said for the shape of the base. Further, instead of vertically moving the cover member, it is naturally possible to vertically move the pedestal. In this case, for example, the support sleeve 17 and the rotary shaft 14 can be moved up and down by using a hydraulic device. The adhesive used may be of any type as long as it can bond the first resin substrate and the second resin substrate together.

[0047]

As described above, the present invention has the above-mentioned structure, and therefore, when the adhesive agent interposed between the first resin substrate and the second resin substrate is spread, the adhesive agent that scatters outward is prevented. It can be reliably received and prevented from splashing around. Further, the peculiar structure of the cover member completely prevents the adhesive from scattering in the vertical direction.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a spreading device.

FIG. 2 is a view showing the outer appearance of the upper lid part, (A)
Shows a perspective view of the upper lid portion, and (B) shows a BB cross section of the upper lid portion.

FIG. 3 is an external view of a spreading device.

FIG. 4 is a diagram showing a process of spreading.

FIG. 5 is a schematic view showing a spreading device of a modified example of the cover member.

FIG. 6 schematically shows a process of manufacturing an optical disc D by bonding two resin substrates together.

FIG. 7 is a schematic cross-sectional view of an optical disc in which two resin substrates are bonded together.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receiving stand 11 ... Boss part 12 ... Disk-shaped plate body 13 ... Space 14 ... Rotating shaft 15 ... Bearing 16 ... Passage 17 ... Support sleeve 18 ... Ultraviolet irradiation source 19 ... Reflector 2 ... Cover member 20 ... Dome body 21 ... Top cover 22 ... Side wall 22A ... Top groove 23 ... Bottom stand 25 ... Cylinder rod 26 ... Ejection port 27 ... Bent part 28 ... Standing wall part 29 ... Bottom plate part D1 ... Optical disk A ... Spreading device H1, H2, H3 ... Suction hole R ... Adhesive S ... Inclination T ... Lower surface U1 ... First resin substrate U2 ... Second resin substrate

Claims (10)

[Claims] 1. An optical disk spreading apparatus for stacking a second resin substrate on a first resin substrate via an adhesive and rotating them integrally to spread the adhesive, wherein the first resin substrate is mounted. An optical disk spreading device having a rotatable pedestal to be placed and a cover member for receiving the adhesive scattered by the rotation. 2. The optical disk spreading apparatus according to claim 1, wherein the cover member is arranged so as to surround the entire periphery of both the resin substrates. 3. The optical disk spreading device according to claim 1, wherein the cradle moves up and down. 4. The optical disk spreading device according to claim 1, wherein the cover member moves up and down. 5. The optical disk spreading apparatus according to claim 1, wherein the cover member has a discharge port for discharging the received adhesive. 6. The cover member comprises a dome member and a bottom plate that receives the dome member, and the dome member is detachable from the bottom plate.
The optical disk spreading device described. 7. The optical disk extending apparatus according to claim 6, wherein the dome member is composed of an upper lid portion and a side wall portion, and the upper lid portion is removable from the side wall portion. 8. The optical disk spreading apparatus according to claim 7, wherein the lower surface of the upper lid portion is inclined. 9. The optical disk spreading device according to claim 1, wherein a suction hole for sucking the adhesive is provided in a boss portion provided in the center of the pedestal. 10. The optical disk spreading apparatus according to claim 1, wherein a suction hole for sucking and holding the resin substrate is provided on the surface of the cradle.