JPH035975B2 - - Google Patents

Description

Detailed Description of the Invention The present invention uses a radiation-curable resin to obtain a flat information recording carrier from a flat information mold having a surface structure corresponding to the surface structure corresponding to the recorded information of the mold. The present invention relates to a duplicating device for a flat information recording carrier.

Compression molding and injection molding are known as methods for manufacturing conventional flat information recording carriers, particularly audio disks, digital audio disks and video disks on which signals are recorded at high density. However, both of these are made by heating and plasticizing the thermoplastic resin above its melting point.
In particular, in the case of vinyl chloride resin, the disadvantage is that the mold is easily corroded due to decomposition of the material and the generation of chlorine gas, large-scale capital investment is required for production equipment, and pollution such as noise, vibration, and air pollution is a problem. Become. Other molding methods include a molding method in which a resin that is cured by heat rays or radiation is used to transfer mold signals onto a supporting material; however, thermosetting has the drawback of requiring a heat source and time for curing; A radiation curing resin molding method is suitable as a method for duplicating in a short time using relatively simple manufacturing equipment. As described in Japanese Patent Publication No. 53-33244, a method of duplicating information signals on a mold using a radiation-cured resin is to cover the mold evenly with liquid resin, and then apply a backing support material to this. A method of manufacturing a replication carrier by pressing, pressing with a flat presser, and curing with radiation;
53-116105, a method of dripping liquid resin onto a mold, deforming the backing support material into a convex spherical surface, pressing it against the resin, and press-coating the resin onto the mold; There is a method of molding a resin layer on a mold by pressing a supporting material with a roller. However, in all of the above methods, air bubbles are mixed in when dropping the radiation-cured resin onto the mold or when pressing the support material against the resin on the mold, and the signal is particularly densely recorded. This becomes a major defect when molding video disks and digital audio disks.
In addition, all of the above manufacturing methods require time for the manufacturing process and are not suitable for mass production.

Therefore, in the present invention, a flexible backing support material having a central hole is arranged through a central injection shaft so as to provide a gap between the material and the information mold, and a radiation-cured resin is applied to the mold in the gap. In an apparatus for press-coating a resin by injecting the resin under pressure from the center and then pressing the support material with a presser body, one part of the surface of the presser body is used.
part or the entire area has a spherical convex structure, and the presser body having the spherical convex structure deforms elastically so that the part in contact with the supporting material becomes flat, and moves radially and continuously on the supporting material from the inner circumferential part to the outer circumferential part. The structure is such that the resin between the mold and the support material is pressure-coated to a uniform thickness by pressing the support material, and high-quality replication supports can be manufactured with high production efficiency.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 8 denotes a flat information recording mold, which is fixed to the surface of a mold case 9 by an injection shaft housing 1 that holds a central injection shaft 4 slidably in the vertical direction. The central injection shaft 4 has a central hole 4d at its center, and the central injection shaft 4 has a central hole 4d below a large-diameter holding portion 4c provided at the tip.
Several injection holes 4 open in the radial direction and communicating with d.
d, and is connected via a supply pipe 6 to an external device that can intermittently pressurize and discharge a certain amount of radiation-cured liquid resin 5 from the injection hole 4b. Further, the central injection shaft 4 is fitted with a flexible backing support member 10 having a center hole by a shaft head 4a provided at the center of a holding part 4c, and is held on the holding part 4c. The connecting portion 7 is arranged so that the material 10 and the mold 8 are located at a position with a constant gap h.
It is attached to an air cylinder (not shown) which can be moved up and down. Reference numeral 3 denotes an O-ring, which is attached to the sliding portion of the central injection shaft 4 and the injection shaft housing 1. Reference numeral 11 denotes a presser body whose surface has a spherical convex structure, the surface of which is made of a covering made of rubber or the like that can be elastically deformed and restored, and the inside of which is filled with pressurized fluid via a pipe 14. There is. Further, this presser body 11 is connected to a cylinder 13 that is vertically slidable.

Next, the operation of this embodiment will be explained. In FIG. 1, a flexible support material 10 (for example, a vinyl chloride resin board, an Aksol resin board, a polycarbonate resin board, a polystyrene resin board, etc.) having a central hole is
A certain gap h (approximately 1 to 2
The holding part 4 of the central injection shaft 4 has been driven upward by
Place it on c. At this time, the information recording groove of the mold 8 and the center hole of the carrier material 10 are coaxially aligned by the central injection shaft 4 and the injection shaft housing 1.

Next, as shown in FIG. 2, the presser body 11 whose surface has a spherical convex structure is lowered from above, and the tip of the presser body 11 is placed in the center of the carrier material 10 corresponding to the holding part 4c of the central injection shaft 4. While being pressed into contact, the contact surface elastically deforms and stops descending when it reaches a flat end. At this time, the supporting material 10 is pressed against the holding part 4c of the central injection shaft by the elastic deformation force of the tip of the presser body 11. Next, while the presser body 11 is stopped, a fixed amount of radiation-cured resin 5 is injected into the gap h between the mold 8 and the support material 10 by an external discharge injection device connected to the central injection shaft 4. do. At this time, supporting material 10
The holding part 4 of the injection shaft is held by the tip of the presser body 11.
c, the injected resin is prevented from penetrating between the holding part 4c and the supporting material 10. When the injection is completed, the presser body 11 is lowered again. At this time, the convex portion of the presser body 11 presses the supporting material 10 radially from the inner peripheral portion toward the outer peripheral portion while elastically deforming so that the contact surface becomes flat.
Therefore, the resin 5 injected between the supporting material 10 and the mold 8 is pushed radially from the center to the outer periphery by the pressure of the presser body 11, and is pressure-coated.
Then, as shown in FIG. 3, the pressing contact surface between the presser body 11 and the support material 10 becomes flat, and the pressure application process of the injected resin between the mold and the support material is completed by the elastic deformation force of the presser body. be done. Since the presser body 11 is filled inside with pressurized fluid and coated on the outside with an elastic material, the entire area of the contact surface with the supporting material 10 can be pressed with a uniform pressing force _P1 . Further, the pressing force by the presser body 11 is changed by controlling the filling pressure P1 of the pressurized fluid inside the presser body ₁₁ and the downward force of the cylinder 13 connected to the presser body. Then, it becomes possible to obtain a necessary uniform resin film thickness t between the supporting material and the mold of several tens of μm to 200 μm. If the presser body is made of a conventional flat plate, if the parallelism between the mold and the presser body is not guaranteed, the thickness of the transferred information layer will be uneven, which will cause major defects during signal reproduction. . In this respect, the present invention has the advantage that there is no need to consider parallelism with the mold.

In addition, in FIG. 3, the spherical convex structure presser body 11
The pressurized fluid inside the presser body is compressed by pressing the presser body, so in order to prevent the elastic coating of the presser body from expanding in the lateral direction, pressure is applied to the outside of the pipe 14 to absorb the pressurized fluid. Reservoir (not shown)
is installed. The pressure reservoir also has a mechanism that prevents the pressurized fluid pressure _P1 inside the presser body from changing before and after pressing. In FIG. 3, when the pressure application of the resin is completed, the presser body 11 is driven upward, the pressure is released, and the spherical convex structure of the presser body is restored.

Next, as shown in FIG. 4, a radiant light source 16 is irradiated from the support material side to harden the resin layer. after that,
By integrating the information transfer layer with the carrier material 10 and peeling it off from the mold, a flat information recording carrier is reproduced.

FIG. 5 shows another embodiment of the presser foot in FIG. 3. The spherical convex structure on the surface is made of an elastically deformable polymeric material (for example, silicone rubber, etc.), and can be manufactured integrally with the internal support 18. In this case, pressurized fluid is supplied inside. No filling required. Furthermore, in the case of silicone rubber, there is no practical problem in the life of the elastic deformation and restoring force of the presser body.

As described above, according to the present invention, in an apparatus for manufacturing a replication carrier by filling the gap between a carrier material in a mold and a flexible backing with a radiation-curable resin, a spherical convex surface with an elastically deformable surface is used. By using the structured presser body, a high-quality flat information recording carrier coated with an information transfer signal layer with a uniform thickness can be manufactured with high production efficiency, and
This also eliminates the generation of bubbles in the radiation-cured resin.

[Brief explanation of the drawing]

1, 2, 3 and 4 are side cross sections of a flat information recording carrier duplication apparatus according to an embodiment of the present invention in different operating states, and FIG. 5 is a side cross section of another embodiment of the present invention. It is a side sectional view of the main part of an example. DESCRIPTION OF SYMBOLS 1... Center injection shaft, 3... O-ring, 4... Center injection shaft, 5... Radiation curing laminating liquid resin, 6...
Liquid resin supply pipe, 8... Flat information recording mold, 9... Mold case, 10... Flexible backing support material, 11, 17... Presser body, 13... Cylinder, 14... Addition Pressure fluid supply pipe.

Claims (1)

[Scope of Claims] 1. Filling at least the central part of the gap between the flat information recording mold and the flexible backing support material, and filling the space between the flexible backing support material and the mold. The supporting material is pressed by a presser disposed on the opposite side to uniformly coat the resin liquid, and then the resin liquid is cured using radiation to form a cured layer. A device for duplicating an information recording carrier by being integrated with a support material and peeled from a mold, the device having a spherical convex structure that can be elastically deformed so that a portion of the presser body that contacts the support material becomes a flat surface. A duplicating device for a flat information recording carrier, characterized by comprising a presser body. 2. The flat information recording device according to claim 1, wherein the inside of the spherical convex structure is filled with pressurized fluid, and the outside is provided with a presser body made of an elastically deformable film. Carrier replication device. 3. The apparatus for duplicating a flat information recording carrier according to claim 1, wherein the spherical convex structure includes a presser made of an elastically deformable polymeric material.