JPS5829631A - Apparatus for duplicating planar information record carrier - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus capable of pressing, bonding and applying a resin between a mold and a carrier member into a uniform thickness, by bringing a resiliently deformable and spherically projected structure of the press body into contact with a flexible lining carrier member so as to cause said structure to be deformed into a flat shape that presses the carrier member. CONSTITUTION:A radiation-setting resin 5 is filled in a space between a mold 8 and a flexible lining carrier member 10, and the carrier member 10 is pressed by a press body 11. The press body 11 has the resiliently deformable and spherically projected structure thereby the whole area of the contact surface thereof with the carrier member 10 can be pressed under a uniformly pressing pressure P1. Thus the planar information record carrier that is coated with an information transfer signal layer with a uniform thickness can be produced in good productivity.

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 conventional methods for manufacturing flat information duplication carriers, particularly audio discs, digital audio discs and video discs on which signals are recorded at high density. However, both of these methods require heating and plasticizing the thermoplastic resin above its melting point, which, especially in the case of vinyl chloride resin, has the disadvantage of easily corroding the mold due to decomposition of the material and the generation of chlorine gas, as well as the need for large-scale production equipment. Large capital investments are required, and pollution such as noise, vibration, and air pollution also becomes a problem. Other molding methods include a molding method that uses a resin that is cured by heat rays or radiation and transfers the mold signal to Mutual Murakami. A radiation curing resin molding method is suitable as a method for duplicating in a short time using a simple manufacturing device. As described in Japanese Patent Publication No. 53-33244, a method of duplicating the information signal of a mold using radiation-cured resin is to cover the mold evenly with liquid resin, and then cover it with a backing material. There is a method in which a replication carrier is produced by pressing the resin, further crimping it with a flat plate-like presser body, and curing it with radiation, or by dropping liquid resin onto the mold, as in Japanese Patent Application Laid-Open No. 53-116106, and applying pressure to the back side. There are two methods: one method is to deform the backing support material into a convex spherical surface, press it against the resin, and apply the resin on the mold by pressure, and another method is to press the backing support material with a roller and mold the resin layer into the mold. be. However, in any of the above methods, air bubbles may be mixed in when dropping the radiation-cured resin onto the mold or when pressing the supporting material against the resin on the mold, and the signal may be recorded in a particularly high density. This becomes a major defect when molding video discs and digital audio discs. 'T1, all of the above manufacturing methods require time for the manufacturing process and are not good for mass production.

Therefore, in the present invention, a flexible backing support material having a central hole is installed 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 within the gap. In an apparatus that presses and applies resin by injecting the resin under pressure from the center and then pressing the supporting material with a presser body, a part or the entire surface of the presser body has a spherical convex structure. The resin between the mold and the supporting material is compressed by pressing the supporting material radially and continuously from the inner circumferential part to the outer circumferential part while elastically deforming the presser body so that the part that contacts the supporting material becomes flat. The structure is such that high-quality replication carriers can be manufactured with high production efficiency by applying pressure to a uniform film thickness.

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/using 1 that holds a central injection shaft 4 so as to be slidable in the vertical direction. The central injection shaft 4 has a central hole 4d at its center, and below a large-diameter holding portion 4C provided at the tip, there are several holes that communicate with the central hole 4d and open in the radial direction. An injection hole 4b is provided and connected via a supply vibro to an external device that can intermittently discharge a certain amount of radiation-cured liquid resin 5 from the injection hole 4b under pressure. The central injection shaft 4 also includes a flexible backing carrier 10 having a central hole;
The connecting part is fitted so that the shaft head 4a provided at the center of the holding part 4C is fitted and held on the holding part 4C, and the supporting material 1o and the mold 8 are located at a position with a certain gap. 7, it is attached to an air cylinder (not shown) that can be driven up and down. 3 has a Q IJ song, which is attached to the central injection shaft 4 and the sliding part of the injection shaft 1. Reference numeral 11 denotes a presser body whose surface has a spherical convex structure, and the surface (d) is composed of a coating made of rubber or the like that can be elastically deformed and restored.
It is filled through 4 and 6,-. 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 supporting material 10 (for example, a vinyl chloride resin plate, an acrylic resin plate, a polycarbonate resin plate, a polystyrene resin plate, etc.) having a center hole is placed at a certain gap h so as not to come into contact with the mold 8. It is placed on the holding portion 4C of the central injection shaft 4 which has been driven upward by approximately 1 to 2M. At this time, the information recording groove of the mold 8 and the center hole of the supporting material 10 are aligned in the same window 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 supporting material 10 corresponding to the holding part 4C of the central injection shaft 4. The contact surface elastically deforms while being in suppressed contact, and stops descending when it reaches the child end. At this time, the supporting material 1o 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, with the presser body 11 stopped, a fixed amount of radiation-cured resin 5 is injected into the gap between the mold 8 and the supporting material 10 by an external discharge injection device connected to the central injection shaft 4. do. At this time, the supporting material 10 is pressed against the holding part 4c of the injection shaft by the tip of the presser body 11, so that 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 circumference toward the outer circumference while elastically deforming so that the contact surface becomes flat.

For this reason, the resin 5 injected between the supporting material 10 and the mold 8
Due to the pressure of the presser body 11, the material is swept radially from the center to the outer periphery and is applied under pressure.

Then, as shown in FIG. 3, the pressing contact surface between the presser body 11 and the supporting material 10 becomes flat, and the process of pressure-bonding and applying the injected resin between the mold and the supporting material is completed by the elastic deformation force of the presser body. . The presser body 11 is filled with pressurized fluid inside and coated with an elastic material on the outside, so that the entire contact surface with the supporting material 10 is connected to the cylinder 13 which is connected to the hook body.
By controlling the descending force of the presser body 11, the pressing force of the presser body 11 is changed. 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 pressurized fluid inside the presser body is compressed by pressing with the spherical convex structure body 11, so in order to prevent the elastic coating of the presser body from expanding in the lateral direction, the pipe is A pressure reservoir (not shown) is installed outside of 14 to absorb pressurized fluid. Further, the pressure reservoir has a function to prevent the pressurized fluid pressure P inside the presser body from changing depending on whether it is pressed or not. In FIG. 3, when the pressure application of the resin is completed, the presser body 11 is driven upward to release the pressure, 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 supporting material side to harden the resin layer. Thereafter, the information transfer layer is integrated with the supporting material 10 and peeled off from the mold, thereby duplicating the flat information recording carrier.

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 mold and a flexible backing with a radiation-curable resin, a spherical convex surface with an elastically deformable surface can be 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 a production efficiency of 10 times higher. Moreover, the generation of bubbles in the radiation-cured resin is also eliminated.

[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. 1...Center injection shaft, 3...0 ring, 4...
...Central injection shaft, 5...Radiation curing laminating liquid resin,
6... Liquid resin supply pipe, 8... Flat information recording mold, 9... Mold case, 10.
...Flexible back support material, 11.17°°゛°゛° presser body, 13... Cylinder, 14...
- Pressurized fluid supply pipe. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2 f Figure 5

Claims (3)

[Claims] (1) Filling at least the central part of the gap between the flat information recording mold and the flexible backing support material, and placing the flexible backing support material on the side opposite to the gold layer. After applying pressure with a presser disposed on the supporting material to uniformly coat the supporting material with the resin liquid, the resin liquid is cured using radiation, and the cured layer is integrated with the supporting material to form a gold layer. In order to duplicate the information recording carrier by peeling it from the mold, at least the surface of the presser body is made to have an elastically deformable spherical convex structure, and the part where the presser body contacts the support material is flat. A copying apparatus for a flat information recording carrier, characterized in that the supporting material is pressed while being elastically deformed. (2) The inside of the spherical convex structure of the presser body is filled with pressurized fluid,
Claim 2-2: The duplicating device for a flat information recording carrier according to claim 1, characterized in that the exterior thereof is constituted by an elastically deformable coating. (3) The apparatus for duplicating a flat information recording carrier according to claim 1, wherein the spherical convex structure of the presser member is made of an elastically deformable polymeric material.