JPH03219439A - Optical recording medium - Google Patents

Abstract

PURPOSE:To reduce a manufacturing cost by sticking a discoid film on which the rugged pattern of a signal and the pattern molding layer, the reflection film layer, or the recording layer of a pre-groove, etc., are formed on a discoid substrate at outer and inner peripheral parts. CONSTITUTION:The discoid film where a first hole part 1a is provided in the center or the rugged pattern 2 of the signal is formed on one plane of a sheet 1, and a reflection layer is formed on it. In the pattern 2, the rugged pattern of the signal and the pre-groove, etc., are formed with emboss molding by cooling after performing heating and pressurization by superimposing a signal matrix on the one side plane of the sheet 1 with a roll pressing machine. Furthermore, a transparent discoid substrate 3 equipped with a second hole part 3a in accordance with the hole part 1a in the center is stuck on both an outer side non-recording part 1b and an inner side non-recording part 1c at the reflection film layer side of the sheet 1. Thereby, productivity can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to optical recording media such as optical discs (compact discs) and video discs, and particularly relates to optical recording media such as optical discs (compact discs) and video discs. This invention relates to an optical recording medium.

[Prior Art] Optical recording has advantages over magnetic recording in that there is no contact between the recording medium and the head, and it is possible to record with a high hole density. As this optical recording medium, there are known read-only ones, additionally writable ones, and erasable and rewritable ones, and the optical recording medium according to the present invention has already been used as an optical disc (compact disc). It has been put into practical use in the form of optical video discs and optical video discs.

[Problem to be Solved by the Invention] Conventionally, this type of optical recording medium, such as an optical disc or a laser disc, has a concavo-convex pattern or a pre-groove of a signal transferred onto a resin substrate, and the concave-convex pattern is A reflective film layer or a recording film layer is formed on the surface, and a protective layer is formed thereon. However, in such optical recording media, batch processing must be performed in each step of manufacturing the disc, resulting in high manufacturing costs.

On the other hand, in recent optical recording media, a concave-convex pattern or pregroove of a signal is transferred to a resin film or sheet by heat pressing, a reflective film layer is formed on the surface of this concave-convex pattern, and then a reflective film layer is further formed on the reflective film layer. Disks with resin substrates bonded together with adhesive have been proposed. In this case, the entire surface of the resin film or sheet and the resin substrate are bonded using an adhesive, but in the case of full-surface bonding, it is extremely difficult to apply the adhesive uniformly over the entire surface, and It is also difficult to bond without forming a pool, and as a result, defects occur in the recording portion, reducing reliability.

Furthermore, air sandwich structure disks have been proposed as other optical recording media. However, in such optical recording media, spacers must be inserted between the substrates, which not only complicates the manufacturing process and lowers productivity, but also increases manufacturing costs. It becomes thicker and becomes very inconvenient to handle.

The present invention was made to solve the above-mentioned problems, and provides an optical recording medium that is extremely easy to handle and can reduce manufacturing costs, improve reliability, and improve productivity. The purpose is to provide.

[Means for Solving the Problems] In order to achieve the above object, the first invention includes a first hole in the center, a pattern forming layer such as a concave-convex pattern of a signal, a pregroove, etc. on one side; A disc-shaped film or sheet on which a reflective film layer or a recording film layer is formed, and a disc-shaped transparent substrate having a second hole corresponding to the first hole in the center are combined into a reflective film. The layer side or the recording film layer side is on the inside, and the structure is made by bonding at least one of the outer non-recording part or the inner non-recording part, and in the second invention, the A disc-shaped disc having a pattern forming layer such as a concavo-convex pattern or a pre-groove for signals on one side, a reflective film layer or a recording film layer formed thereon, and a protective film layer formed thereon. A film or sheet and a disc-shaped transparent substrate having a second hole in the center corresponding to the first hole are placed so that the protective film layer side is on the inside. At least one of the circumferential non-recording portions is bonded together.

[Function] Therefore, in the optical recording medium of the present invention, a pattern forming layer such as a concavo-convex pattern or a pre-groove for a signal is continuously formed on a disc-shaped film or sheet, and a reflective film layer or a recording film layer is further formed as necessary. By continuously forming protective film layers in accordance with the above, manufacturing costs can be reduced. In addition, by bonding the disc-shaped film or sheet and the disc-shaped transparent substrate to at least one of the outer non-recording part and the inner non-recording part, defects in the recording part can be reduced. This makes it possible to improve reliability. Furthermore, even when a disc-shaped film or sheet and a disc-shaped transparent substrate are bonded together using an adhesive, the entire surface is not bonded.
It is possible to eliminate the adhesive from protruding to the outer or inner circumferential side. Furthermore, by bonding a disc-shaped film or sheet and a disc-shaped transparent substrate together using an impulse sealing method, heat sealing method, ultrasonic sealing method, etc., it is possible to perform the bonding in a short time. Become.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the overall configuration when the present invention is applied to an optical disc. That is, the optical disc of this embodiment has a concavo-convex pattern 2 of a signal as shown in FIG. Further, on the reflective film layer side of this film or sheet 1, a second hole 3 corresponding to the first hole 1a is formed in the center.
A disc-shaped transparent substrate 3 having a diameter of 1.a is bonded together at both the outer non-recording portion 1b and the inner non-recording portion 1c.

Here, the material of the film or sheet 1 is generally a heat-resistant resin such as polyester resin, polycarbonate resin, vinyl chloride resin, acrylic resin, etc.
Or a laminate thereof can be used. And, from the characteristics such as surface smoothness and heat resistance, the thickness is 10μm to 500μm.
It is optimal to use a polyester resin with a diameter of approximately 30 μm to 150 μm. In this example, the thickness is 50
A μm polyester resin is used.

The uneven pattern 2 can be formed on one side of the film or sheet 1 using a roll press machine as shown in FIG.
By overlapping the surfaces of the stampers, that is, the signal matrix, heating and pressurizing, and then cooling, a concave-convex pattern, a pregroove, etc. of the signal are formed by embossing molding.

In this case, a flat press, a circular press, or a rotary press may be used. Further, the depth of the pits and pregrooves is set to 0.05 to 0.2 μm. In this example, a stamper is used to heat press to a depth of 0.1.
Transfer 2 μm pits.

Further, as the reflective film layer, metals such as aluminum, aluminum alloy, copper, copper alloy, gold, silver, platinum, nickel, etc. can be formed by sputtering method using a vacuum chamber as shown in FIG. 4, or by vacuum evaporation method. , a thickness of 0.0 that allows a specified reflectance to be obtained by a method such as the ion blating method.
The thickness is 6 μm or more. In this example, a reflective film layer made of aluminum and having a thickness of 0.08 μm is provided.

On the other hand, as the material for the substrate 3, in consideration of transmittance, birefringence, etc., transparent resins with low birefringence are generally used, such as glass, polycarbonate resin, acrylic resin, vinyl chloride resin, Epoxy resin, amorphous polyolefin resin, etc., or a laminate thereof can be used. In this example, polycarbonate resin is used. The optimum thickness of the substrate 3 is such that the thickness of the entire optical disc is 1.2 mm.

Furthermore, the bonding of the disc-shaped film or sheet 1 and the disc-shaped transparent substrate 3 can be resealed using, for example, an impulse sealing device as shown in FIG.

In this case, the width of the seal portion, including the outer and inner peripheries, is preferably about 0.5 mm to 3.0 mm. In addition,
In FIG. 5, 4 is a crimp plate, 5 is a crimp base, 6 is an outer seal of 1.0 bar, and 7 is an inner seal bar.

In the optical disc constructed as described above, a concavo-convex pattern 2 of a signal is formed on a disc-shaped film or sheet 1.
can be continuously molded, reducing the manufacturing cost of optical discs. Furthermore, since the disc-shaped film or sheet 1 and the disc-shaped transparent substrate 3 are bonded together by the impulse sealing method at both the outer non-recording portion 1b and the inner non-recording portion 1c, recording is possible. It is possible to reduce defects in parts and improve reliability. Furthermore, since the disc-shaped film or sheet 1 and the disc-shaped transparent substrate 3 are bonded together by the impulse sealing method, the bonding can be carried out in a short time.

As described above, the optical disc of this embodiment has a signal unevenness pattern 2 formed on one side of a disc-shaped film or sheet 1 having a first hole 1a in the center, and a reflective film layer formed thereon. Then, on the reflective film layer side of this film or sheet 1, a disc-shaped transparent substrate 3 having a second hole 3a corresponding to the first hole 1a in the center is placed on the outer non-recording portion 1b. Both the inner circumferential non-recording portion IC and the non-recording portion IC are bonded together using an impulse sealing method.

Therefore, the following various effects can be obtained.

(a) It is possible to continuously form a pattern forming layer 2 such as a concavo-convex pattern or pre-groove for a signal on a disc-shaped film or sheet 1, and furthermore, it is possible to continuously form a reflective film layer or a recording film layer. There is no need to perform batch processing in the process, making it possible to significantly reduce the manufacturing cost of optical discs.

(b) A disc-shaped film or sheet 1 and a disc-shaped transparent substrate 3 are bonded together at both the outer non-recording portion 1b and the inner non-recording portion 1C by an impulse sealing method. Therefore, defects in the recording section can be reduced, and the reliability of the optical disc can be greatly improved.

(C) The disc-shaped film or sheet 1, the disc-shaped transparent substrate 3, and the disc-shaped film or sheet 2 are pasted together using the impulse sealing method, so the pasting can be done in a short time, which improves productivity. It becomes possible to aim for improvement.

(d) The overall thickness of the optical disc does not increase, so
Its handling is extremely easy.

In the above embodiment, a signal unevenness pattern 2 as shown in FIG. 2 is formed on one side of a disc-shaped film or sheet 1 having a first hole 1a in the center, and a reflective film layer (not shown) is formed on one side of the disk-shaped film or sheet 1 having a first hole 1a in the center. A weather-resistant protective film layer (not shown) is further formed on the film or sheet 1.
on the protective film layer side, a second hole corresponding to the first hole 1a is formed in the center.
An optical disk may be constructed by bonding a disc-shaped transparent substrate 3 having a hole 3a at both the outer non-recording portion 1b and the inner non-recording portion 1c.

In this case, for example, on a reflective film layer formed using a vacuum chamber as shown in FIG. Stack the tanks.

Further, as the material of this protective film tank, aluminum nitride, silicon nitride, etc. may be used.

Further, in the above embodiment, a case has been described in which the signal unevenness pattern 2 is formed on one side of the film or sheet 1 by a roll press method, but the signal unevenness pattern 2 is not limited to this, and can be formed by, for example, a heat press method, a 2P method, etc. 2 may be formed.

Further, in the above embodiment, the film or sheet 1 and the substrate 3 are bonded together using an impulse sealing method, but the method is not limited to this, and for example, a heat sealing method, an ultrasonic sealing method, or an adhesive bonding method is used. They may be bonded together using an agent.

In this case, for example, when an adhesive method is used, various adhesives such as urethane adhesive, epoxy adhesive, acrylic adhesive, etc. can be used as the adhesive. Then, the disc-shaped film or sheet 1 and the disc-shaped transparent substrate 3 are bonded together at both the outer periphery side valve recording portion 1b and the inner periphery side non-recording portion 1c using an adhesive. It becomes possible to eliminate the agent from protruding toward the outer or inner circumference.

On the other hand, in the above embodiment, the disc-shaped film or sheet 1 and the disc-shaped transparent substrate 3 are connected to the outer non-recording portion 1.
Although the case where both the inner peripheral non-recording portion 1c and the inner non-recording portion 1c are bonded together has been described, the present invention is not limited to this. Either the outer non-recording portion 1b or the inner non-recording portion 1c may be bonded together.

Furthermore, in the above embodiment, when the disc-shaped transparent substrate 3 is a glass plate, or even if it is another resin substrate, it is possible to form an adhesive layer on the inner and outer peripheries of the resin substrates to be bonded together. desirable.

Further, in the above embodiments, it is desirable that the disc-shaped film or sheet 1 on which the concavo-convex pattern, pregroove, etc. of the signal are formed is provided with a concavo-convex pattern forming resin layer made of resin that is easy to mold.

On the other hand, in the above embodiment, a non-bonded portion is provided in at least one of the outer circumference 5 side valve recording portion 1b or the inner circumference side non-recording portion 1c which are bonded together to allow circulation with outside air. You can.

Further, in the above embodiment, the shape of the transparent substrate 3 is not a flat plate shape, but a ring-shaped convex portion on the outer non-recording portion 1b or the inner non-recording portion 1c, and the sealing is performed using this convex portion. Alternatively, the disk may have a hollow structure.

Further, in the above embodiments, the shape of the crimping surface of the seal bar ring of the impulse seal device is not limited to a flat shape, but may also be a lattice shape, a dot shape, a concentric circle shape, or a radial pattern.

Furthermore, in the above embodiments, a metal or alloy such as tellurium, silver, indium, zinc, aluminum alloy, copper, or lead is deposited on the reflective film layer or on the pregroove forming surface as a recording film layer by vacuum evaporation. Alternatively, it may be provided by a method such as a sputtering method or an ion blasting method. Alternatively, the dye may be formed by coating or vacuum deposition. Furthermore, various known optically recordable recording materials may be used as the recording film layer material.

[Effects of the Invention] As explained above, according to the present invention, the first hole is provided at the center, a pattern forming layer such as a concavo-convex pattern or a pre-groove for signals is provided on one side, and a reflective film layer or a recording film is formed on the pattern forming layer on one side. A disc-shaped film or sheet on which a layer (and a protective film layer if necessary) is formed, and a second hole corresponding to the first hole in the center.
A disc-shaped transparent substrate with a hole is placed with the reflective film layer side or the recording film layer side (or the protective film layer side) facing inside, and the outer non-recording part or the inner non-recording part is removed. Since the structure is made by bonding at least one of the parts, it is possible to reduce manufacturing costs, improve reliability, and improve productivity, and it is possible to provide an optical recording medium that is extremely easy to handle. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an embodiment in which the present invention is applied to an optical disc, and FIGS. 2 to 5 are diagrams for explaining a method of manufacturing an optical disc in the same embodiment. FIG. 6 is a diagram for explaining a method of manufacturing an optical disc in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Film or sheet, 1a... First hole, 2... Uneven pattern, 3... Substrate, 3a... Second hole, 4... Crimping plate, 5...・Crimp base, 6・
...Outer seal bar, 7...Inner seal bar

Claims (7)

[Claims] (1) A disc-shaped film or sheet having a first hole in the center, a pattern forming layer such as a concavo-convex pattern or a pregroove for signals on one side, and a reflective film layer or a recording film layer formed thereon; A disk-shaped transparent substrate having a second hole corresponding to the first hole in the center is placed on the outer non-recording portion with the reflective film layer side or the recording film layer side facing inside. Or, an optical recording medium characterized in that it is formed by bonding at least one of the inner non-recording portions. (2) A first hole is provided in the center, and a pattern forming layer such as a concavo-convex pattern or pre-groove for signals is formed on one side, a reflective film layer or a recording film layer is formed on top of this, and a protective film layer is further formed on top of that. The formed disc-shaped film or sheet and a disc-shaped transparent substrate having a second hole corresponding to the first hole in the center are placed so that the protective film layer side is on the inside. , an optical recording medium comprising at least one of an outer non-recording portion and an inner non-recording portion bonded together. (3) The optical recording medium according to claim 1 or 2, wherein the film or sheet and the substrate are bonded together by an impulse sealing method. (4) The optical recording medium according to claim (1) or (2), wherein the film or sheet and the substrate are bonded together using an adhesive. (5) Claim (1) characterized in that the film or sheet and the substrate are bonded together by a heat sealing method.
) or (2). (6) Claim (1) characterized in that the film or sheet and the substrate are bonded together by an ultrasonic sealing method.
) or (2). (7) A claim characterized in that a non-bonded portion is provided in at least one of the bonded outer non-recording portion or the inner non-recording portion to allow circulation with outside air. The optical recording medium according to item (1) or item (2).