JP2003203389A - Optical recording medium and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an optical recording medium, the outer appearance of which is improved and in which no transparent layer is peeled off by hooking, etc., a method for manufacturing the optical recording medium and a manufacturing device. <P>SOLUTION: In this optical recording medium comprising a substrate 101 with a signal pit or recording track composed of recessed/projecting parts formed on at least one face as an information face, a thin film layer 103 formed on the information face and a protective layer 105 formed on the thin film layer, the edge part of the protective layer is provided with linear or circular arc-shaped inclination 106 that is ≤80° and ≥30° with respect to the surface of the protective layer, and the diameter of the protective layer is smaller than the diameter of the surface of the substrate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium for recording / reproducing or reproducing only, and a manufacturing method and manufacturing apparatus thereof.

[0002]

2. Description of the Related Art In recent years, with the expansion of the amount of information required by information equipment, audiovisual equipment, etc., optical discs have been recorded that are easy to access data, can store large amounts of data, and can be miniaturized. Attention has been paid as a medium, and the density of recorded information has been increased. For example, as a means for increasing the density of an optical disc, the wavelength of a recording / reproducing laser light source is about 400n.
m, a recording / reproducing head with a numerical aperture (NA) of 0.85 is used as a light collecting lens for narrowing down the laser light, and about 25 GB
An optical disc having a capacity of is proposed.

The structure and manufacturing method of a conventional optical disk will be described below with reference to FIGS.

FIG. 2 shows a cross-sectional view of a thin sheet-bonded optical disc which is a conventional optical disc. The thin sheet-bonded optical disc has signal pits and recording tracks transferred as concavities and convexities on one side by injection compression molding using a Ni stamper, etc., and recording films are formed on the signal pits and recording track side by sputtering or vapor deposition. The thickness of the thin film layer 201 formed of the material or the reflective film material is 1.1 m
A first substrate 202, which is a resin substrate having a thickness of about m, and a second substrate 203, which is transparent to recording / reproducing light and has a thickness of about 0.1 mm.
And a transparent layer 204 having a thickness of about 20 μm formed by a method such as spin coating with an adhesive such as an ultraviolet curable resin for adhering the two substrates. The second substrate 203 has a smaller outer diameter and a larger inner diameter than the first substrate 202 in advance in order to reduce burrs generated on the disk end surface due to eccentricity or the like during bonding.
It is manufactured by punching out a sheet-shaped substrate having a size of about mm. Therefore, the ultraviolet curable resin, which is an adhesive material for the two substrates, is exposed to the outer peripheral portion of the disc at the outer peripheral portion 205 of the disc by the difference in the outer diameters of the second substrate 203 and the first substrate 202 during the stretching by the spin coating method. To do.

FIG. 3 is a sectional view of another conventional optical disk, a spin-coated optical disk. The spin-coated optical disc has signal pits and recording tracks transferred as irregularities on one side by injection compression molding, and a thin film layer such as a recording film material or a reflective film material on the signal pits or recording track surface side by a method such as sputtering or vapor deposition. Three
The first substrate 302, which is a resin substrate having a thickness of about 1.1 mm and on which 01 is formed, and an adhesive such as an ultraviolet curable resin that is transparent to recording / reproducing light are formed to a thickness of about 0.1 mm by spin coating. And the transparent layer 303 formed.

[0006]

However, in a thin sheet-bonded optical disk, if the sheet-like substrates produced by punching or the like are bonded as they are, an acute angle portion is generated at the end of the optical disk and the optical disk is caught during handling. Could occur. Further, in the outer peripheral portion of the disc, when the ultraviolet curable resin is stretched by the spin coating method, the ultraviolet curable resin is exposed to the outer peripheral portion of the disc by a difference in outer diameter between the second substrate and the first substrate, and uneven stretching of the ultraviolet curable resin occurs. It was exposed. Furthermore, in a spin-coated optical disc, since the transparent layer is formed by an adhesive such as an ultraviolet curable resin only by the spin coating method, irregularities due to burrs and uneven thickness may occur at the disc end, and a catch may occur during handling. there were.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to improve the appearance and to cause peeling of the transparent layer due to being caught during handling. An optical recording medium, a method for manufacturing the same, and a manufacturing apparatus for the same are provided.

[0008]

In order to solve the above-mentioned problems, the optical recording medium of the present invention has an edge portion of the protective layer with an inclination of 80 degrees or less and 30 degrees or more with respect to the surface of the protective layer to form an acute angle portion. The above object is achieved by removing burrs and burrs.

In one embodiment, the edges of the protective layer are
The above object can be achieved by heating with heat of 0 degrees or more and 500 degrees or less and providing a gradient.

Alternatively, the above object can be achieved by providing an inclination by cutting the end portion of the protective layer.

Further, it is composed of a substrate having signal pits or recording tracks formed of unevenness on at least one surface as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A spin table that rotates while adsorbing the optical recording medium, a heating unit that heats the end of the optical recording medium, and an exhaust unit that sucks the vaporized atmosphere generated when the end of the optical recording medium is heated. The above object is achieved by using a device provided with.

Further, it is composed of a substrate having signal pits or recording tracks formed as unevenness on at least one surface as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A spin table that rotates while adsorbing the optical recording medium, a cutting unit that cuts the end of the optical recording medium, and an exhaust unit that sucks in the shavings generated when cutting the end of the optical recording medium. The above object is also achieved by using the provided device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention for solving the above problems will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing Embodiment 1 of an optical disk according to the present invention. First substrate 1
01 is a CD for improving the warp and rigidity of the disc.
It is made of a resin disk such as polycarbonate with a thickness of about 1.1 mm, which is manufactured by injection compression molding so as to have thickness compatibility with optical disks such as DVDs and DVDs, and signal pits and recording tracks are formed on one side as irregularities. Signal side 102
have. Signal surface 1 formed on the first substrate 101
02 is a RAM (Random Access M).
memory), recording film materials for RW (Re-Rwitable) disks, and ROM (Read On).
A thin film layer 103, which is a metal reflective film for the purpose of a ly Memory disk, is formed. A second substrate 105, which is thinner than the first substrate 101 and made of a resin sheet such as polycarbonate, is attached to the thin film layer 103 by an ultraviolet curable resin 104.

FIG. 4 shows a process diagram of bonding the second substrate 105 onto the first substrate 101 which is the base. First, the first substrate 401 serving as a base is a disk centering jig 403 provided on the rotary table 402 in a substantially central portion of the rotary table 402 so that the amount of eccentricity with respect to the rotary axis of the rotary table 402 is small. Turntable 402
It is adsorbed and fixed by a plurality of small vacuum holes provided on the upper surface of the. The ultraviolet curable resin 404 is applied on the adsorbed first substrate 401 in a substantially concentric pattern on a desired radius by a dispenser.
A thin sheet made of a resin material such as polycarbonate having a thickness of about 0.1 mm, which is punched by punching or the like on the first substrate on which 04 is applied to have an inner diameter and an outer diameter substantially equal to those of the first substrate 401. A certain second substrate 405 is attached.

The ultraviolet curing resin 404 is stretched by spin-rotating the rotary table 402 with the first substrate 401 and the second substrate 405 integrated with each other, and at the same time, removal of bubbles mixed in the ultraviolet curing resin and thickness control. It is carried out. After that, the ultraviolet curing resin 404 formed between the first substrate 401 and the second substrate 405 is removed by the ultraviolet irradiation device 406.
It is cured by being irradiated with ultraviolet rays. Since the ends of the inner peripheral portion 407 and the outer peripheral portion 408 of the second substrate 405, which are punched by punching or the like, are formed substantially perpendicular to the surface of the thin sheet, they are caught during handling, and are made of polycarbonate or the like. Since a resin material is used, the rigidity is low, and peeling easily occurs when the disc is removed from the disc case or handled.

FIG. 5 is a process diagram of the present invention, in which an inclination is provided at the end of the second substrate. The disk to which the second substrate, which is a thin sheet, is attached, the rotary table 5 is placed so that the second substrate 501 is the opposite surface to the rotary table 502.
02, a centering jig 503 for a disk provided substantially in the center of the rotary table 502 so that the amount of eccentricity with respect to the rotary shaft of the rotary table 502 becomes small, and a plurality of small vacuums provided on the upper surface of the rotary table 502. It is adsorbed and fixed by the holes. After the rotary table 502 that has attracted the disk starts to rotate, the second substrate 501 is provided with a YAG laser 504 that is provided to irradiate the laser light with an inclination of about 10 degrees with respect to the end portion of the second substrate 501.
Irradiate the edge of the.

At this time, the second substrate 5 made of a resin material
The output of the YAG laser 504 is adjusted so that the surface temperature of the end portion of the second substrate 501 is 200 degrees or more and 500 degrees or less so that 01 can be melted at a low speed. Simultaneously with the irradiation of the laser beam, the exhausted portion 505 installed adjacent to the end of the disc sucks the vaporized atmosphere, thereby preventing the vaporized atmosphere from reattaching to the disc.

Table 1 shows the state of burrs when the surface temperature of the end portion of the second substrate 501 is changed from 100 degrees to 1000 degrees.

[0020]

[Table 1]

From Table 1, it was confirmed that a good end face can be obtained when the surface temperature is in the range of 200 to 500 degrees. Further, when the surface temperature is 200 ° C. or higher and 500 ° C. or lower, the surface of the end of the second substrate 105 becomes an arc shape due to the heat melting from the point 106 where the surface of the second substrate 105 starts to tilt in the arc shape due to the heat melting. It was confirmed that the inclination angle formed by connecting the points 107 that started to incline with a straight line was 30 to 80 degrees with respect to the surface of the second substrate. When the surface temperature reached 600 ° C. or higher, the disc portion other than the end face was also melted and deformed.

According to the present embodiment, the end portion of the second substrate is heated by the heat of 200 degrees or more and 500 degrees or less while rotating the disk so that the second substrate 105 is formed substantially perpendicular to the surface of the second substrate 105. The slope 108 can be uniformly provided at the end portion, and the exhausted portion sucks the atmosphere vaporized by heating, so that the vaporized atmosphere can be prevented from being reattached to the disk, and the second substrate can be peeled off. It was possible to realize a good disk that is difficult and has no appearance defect.

In the present invention, the example in which the outer peripheral edge of the disk is provided with an inclination has been described. However, by removing the centering jig of the disk after the disk is adsorbed on the rotary table, the inner peripheral section is the same as the outer peripheral edge of the disk. It was possible to provide an inclination also in. Also, an example in which laser light is used as a heat source for heating the second substrate has been described.
The same result was obtained by inclining a metal which can be performed at 0 degree to the edge portion of the second substrate so as to be close to or in contact with the edge portion.

Also, an example in which the laser beam is radiated at an angle of about 10 degrees with respect to the end portion of the second substrate has been described.
Up to 0 °, no burrs were produced and a good end face could be obtained without affecting the surface of the second substrate. Further, the example in which only the end face of the second substrate is inclined has been described, but the ultraviolet curing resin and the first substrate may be dissolved and inclined. Further, also on the end face of the disk in which the ultraviolet curable resin layer was formed on the thin film layer by the spin coating method instead of the second substrate, good results could be obtained similarly to the disk in which the second substrate was bonded.

(Second Embodiment) FIG. 6 is a process diagram showing a second embodiment for inclining the end portion of an optical disk according to the present invention. The disc to which the second substrate, which is a thin sheet, is attached has an eccentric amount with respect to the rotation axis of the rotary table 602 on the rotary table 602 so that the second substrate 601 is on the opposite surface to the rotary table. The disk centering jig 603 is provided in the center of the rotary table 602 so as to be small, and a plurality of small vacuum holes are provided on the upper surface of the rotary table 602 to attract and fix the disk.

After the rotary table that has attracted the disk starts to rotate at a low speed, about 1 is applied to the end portion of the second substrate 601.
The cutting portion 604, which is provided so as to be in contact with the blade while being inclined by 0 ° or more, is brought into contact with the end of the second substrate 601.
At this time, the pressing force of the cutting portion 604 to the end portion of the second substrate 601 is adjusted so that the second substrate 601 made of a resin material can be cut at a low speed. At the same time as the cutting portion 604 is brought into contact, the exhaust powder 605 installed adjacent to the end portion of the disc sucks in the cutting powder to prevent the reattachment of the cutting powder to the disc.

According to the present embodiment, the edge of the second substrate is cut while rotating the disk to uniformly provide the inclination to the edge formed substantially perpendicular to the surface of the second substrate. It is possible to prevent the redeposition of the vaporized atmosphere on the disc by sucking the atmosphere vaporized by heating by the exhaust part, and it is possible to realize a good disc in which the second substrate is hard to be peeled and there is no appearance defect. did it.

In the present invention, the example in which the inclination is provided at the end of the outer circumference of the disc has been described. However, by removing the centering jig of the disc after adsorbing the disc on the rotary table, the inner circumference is the same as the end of the outer circumference of the disc. It was possible to provide an inclination also in. Further, although the example in which the metal blade is used for cutting the thin sheet has been described, the same result can be obtained by inclining and contacting the end portion of the second substrate with a cutting machine utilizing a rotational force such as a router. Was given. Also, an example was described in which the cutting portion was brought into contact with the end portion of the second substrate with an inclination of about 10 degrees, but up to 60 degrees there was no burr and the surface of the second substrate was not affected. A good end face could be obtained. Furthermore, the second
Although the example in which only the end surface of the substrate is inclined has been described, the ultraviolet curable resin or the first substrate may be cut and inclined. Further, also on the end face of the disk in which the ultraviolet curable resin layer was formed on the thin film layer by the spin coating method instead of the second substrate, good results could be obtained similarly to the disk in which the second substrate was bonded.

[0029]

Since the present invention is constructed as described above, it has the following effects.

According to the present invention, the edge portion of the protective layer of the optical recording medium is provided with an inclination to remove sharp corners and burrs.
It is possible to realize an optical recording medium that does not peel off the transparent layer due to being caught during handling and has a good appearance.

Further, by the method of providing the inclination at the end portion while rotating the substrate, it is possible to easily and uniformly provide the inclination over the entire circumference.

Further, by providing the apparatus with an atmosphere in which the end portion of the optical recording medium is dissolved and vaporized, and an exhaust portion for sucking the shavings generated during cutting, the apparatus is provided with an optical recording of the dissolved and vaporized atmosphere and the shavings. It is possible to prevent reattachment to the medium.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical disc according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a thin sheet-bonded optical disc which is an optical disc according to a conventional technique.

FIG. 3 is a cross-sectional view of a spin-coated optical disc that is an optical disc according to a conventional technique.

FIG. 4 is a process diagram of laminating optical discs according to the present invention.

FIG. 5 is a process diagram showing the first embodiment for inclining the end portion of the optical disc according to the present invention.

FIG. 6 is a process diagram showing a second embodiment for inclining the end portion of the optical disc according to the present invention.

[Explanation of symbols]

101 first substrate 102 Signal side 103 thin film layer 104 UV curable resin 105 second substrate 106 Point that started to tilt 107 Point that started to tilt 108 Inclination of disk edge 201 thin film layer 202 First substrate 203 second substrate 204 transparent layer 205 disk periphery 301 thin film layer 302 First substrate 303 transparent layer 304 disk periphery 401 First substrate 402 rotary table 403 Centering jig 404 UV curable resin 405 Second substrate 406 UV irradiation machine 407 Inner peripheral portion of second substrate 408 Outer peripheral portion of the second substrate 501 second substrate 502 turntable 503 Centering jig 504 YAG laser 505 Exhaust section 601 Second substrate 602 turntable 603 Centering jig 604 cutting part 605 Exhaust section

Continued front page    F term (reference) 5D029 LB05 LB17                 5D121 AA04 EE22 FF03 GG02 GG18                       GG22 GG30

Claims (9)

[Claims] 1. A substrate having at least one surface on which information pits or recording tracks having unevenness are formed as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A structured optical recording medium, wherein the end portion of the protective layer is 80
Provide a linear or arc-shaped inclination below 30 degrees and above 30 degrees,
Moreover, the diameter of the protective layer is smaller than the diameter of the surface of the substrate. 2. The optical recording medium according to claim 1, wherein the edge portion of the protective layer is provided with an inclination by heating with heat of 200 degrees or more and 500 degrees or less. 3. The optical recording medium according to claim 1, wherein an inclination is provided by cutting an end portion of the protective layer. 4. A substrate having signal pits or recording tracks each having an uneven surface as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A method of manufacturing an optical recording medium having a structure, wherein the protective layer is a step of dropping an ultraviolet curable resin on the thin film layer, and a sheet having a thickness smaller than that of the substrate is stuck on the ultraviolet curable resin and spun. A step of adhering the sheet and the substrate on which the thin film layer is formed while stretching the ultraviolet curable resin by rotating, and a step of curing the ultraviolet curable resin by irradiating ultraviolet rays from the sheet side. After going through
A method for producing an optical recording medium, characterized in that an edge is heated and melted by rotating the substrate while rotating the substrate in the same direction as the stretching of the ultraviolet curable resin, and an inclination is provided at the edge of the protective layer. 5. A substrate having signal pits or recording tracks formed of unevenness on at least one side as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A spin table that rotates while adsorbing the configured optical recording medium, a heating unit that heats the end of the optical recording medium, and a suction atmosphere for vaporizing the atmosphere generated when the end of the optical recording medium is heated. An apparatus for manufacturing an optical recording medium, comprising: 6. A substrate having signal pits or recording tracks formed of concavities and convexities as an information surface on at least one surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A method of manufacturing an optical recording medium having a structure, wherein the protective layer is a step of dropping an ultraviolet curable resin on the thin film layer, and a sheet having a thickness smaller than that of the substrate is stuck on the ultraviolet curable resin and spun. A step of adhering the sheet and the substrate on which the thin film layer is formed while stretching the ultraviolet curable resin by rotating, and a step of curing the ultraviolet curable resin by irradiating ultraviolet rays from the sheet side. After going through
A method for producing an optical recording medium, characterized in that the substrate is rotated in the same direction as that of the stretching of the ultraviolet curable resin, and the end portion is cut by a sharp blade to provide an inclination at the end portion of the protective layer. 7. A substrate having signal pits or recording tracks formed of unevenness on at least one surface as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A spin table that rotates while adsorbing the configured optical recording medium, a cutting portion that cuts the end portion of the optical recording medium, and inhaling shavings generated when the end portion of the optical recording medium is cut. An apparatus for manufacturing an optical recording medium, comprising: 8. A substrate having signal pits or recording tracks formed of unevenness on at least one side as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A method of manufacturing an optical recording medium, wherein the protective layer is formed only of an ultraviolet curable resin, wherein the protective layer comprises a step of dropping the ultraviolet curable resin on the thin film layer, After the step of stretching the ultraviolet curable resin to a predetermined thickness and the step of irradiating the ultraviolet ray to cure the ultraviolet curable resin, the end portion while rotating the substrate in the same direction as the stretching of the ultraviolet curable resin. A method for manufacturing an optical recording medium, wherein the protective layer is melted by heating to provide an inclination at an end portion of the protective layer. 9. A substrate having at least one surface on which information pits or recording tracks having unevenness are formed as an information surface, a thin film layer formed on the information surface, and a protective layer formed on the thin film layer. A method of manufacturing an optical recording medium, wherein the protective layer is formed only of an ultraviolet curable resin, wherein the protective layer comprises a step of dropping the ultraviolet curable resin on the thin film layer, After the step of stretching the ultraviolet curable resin to a predetermined thickness and the step of irradiating the ultraviolet ray to cure the ultraviolet curable resin, the end portion while rotating the substrate in the same direction as the stretching of the ultraviolet curable resin. A method for manufacturing an optical recording medium, characterized in that the protective layer is provided with an inclination by cutting with a sharp blade.