JP2001035016A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical disk having an attraction as a commodity and a high value added by successively forming a reflecting layer and a protective layer or the reflecting layer, a 1st protective layer and a printed layer and successively forming a specular layer and a 2nd protective layer on the protective layer or printed layer of the resulting disk. SOLUTION: A reflecting layer 12 comprising an Al alloy is formed on the signal pit 10 forming surface of a substrate 11 and a resin prepared by uniformly adding opaque ink to an acrylic UV-curing resin is applied on the reflecting layer 12 and cured by irradiation with UV to form a 1st resin layer 13. A specular layer 14 comprising a prescribed alloy is formed on the 1st resin layer 13. This specular layer 14 has a specular surface that does not transmit light. An acrylic UV-curing resin is applied on the specular surface 14 and cured by irradiation with UV to form a 2nd resin layer 15. The objective glossy CD with a specular surface that is not tarnished by oxidation and hardly scuffs up is thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical disk, and more particularly to an optical disk suitable for responding to diversification of designs on a printing surface.

[0002]

2. Description of the Related Art Conventionally, there are various types of optical disks, such as CDs, MDs, DVDs, etc.
-R, write-once optical disks such as DVD-R, magneto-optical disks, and phase-change disks have been put into practical use. This type of optical disk basically has the following configuration. A reflective layer using a metal such as Al or Au, a protective layer using a transparent ultraviolet curable resin for preventing the deterioration of the reflective layer, and a recording layer on an optical disk are formed on the surface of the transparent resin substrate on which signal pits are formed. Design print layers representing the contents and the like are sequentially formed.

[0003]

By the way, as in recent years, with the spread of various optical disks, the design of the printed layer has been regarded as important. Initially, the printing layer was formed by single-color screen printing, but recently, multicolor offset printing has been used.
Further, for example, as disclosed in Japanese Patent Application Laid-Open No. H11-31339, an attempt has been made to increase the added value of a product by forming a desired pattern in an area other than the recording area.

[0004] As described above, it has been a problem to provide an optical disk with high added value that is more attractive as a product in response to the diversification of optical disk designs. Therefore, an object of the present invention is to solve the above problems and provide an optical disk having a function as a mirror.

[0005]

As a means for achieving the above object, an optical disk of the present invention comprises a transparent substrate, on which a signal pit is formed, a reflective layer and a protective layer, or a reflective layer, a first layer. It is an object of the present invention to provide an optical disk in which a protective layer and a printed layer are sequentially formed, and a mirror surface layer and a second protective layer are sequentially formed on the protective layer or the printed layer.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (Embodiment 1) FIG. 1 is a schematic sectional view showing a first embodiment of the optical disk of the present invention. A CD having an outer diameter of 8 cm or 12 cm will be described. The transparent substrate 11 having the signal pits 10 on one surface is formed by injection molding. On the surface of the substrate 11 where the signal pits 10 are formed, Al
The reflective layer 12 made of an alloy is
It is formed to a thickness of 90 nm.

[0007] Next, on the reflective layer 12, a uniform resin obtained by adding an opaque ink to an acrylic ultraviolet curable resin is applied by a spin coating method to a thickness of 3 to 7 µm, and the resin is irradiated with ultraviolet light and cured. Then, the first resin layer 13 is formed. Next, this first resin layer 13 contains 95 to 97% by weight of Al and Si, Fe, Mg, Mn, Zn, Ti as other impurities.
Is formed to a thickness of 70 to 110 nm by sputtering using an alloy containing 3 to 5% by weight in total. This mirror surface layer 14 is a mirror surface that does not transmit light.

Next, an acrylic ultraviolet curable resin is applied on the mirror surface layer 14 to a thickness of 2 to 6 μm by spin coating, and is cured by irradiating ultraviolet light to form a second resin layer 15.
To form The second resin layer 15 protects the mirror layer 14. With the above, it is beautiful and there is no oxidation discoloration of the mirror surface,
In addition, a CD having a mirror surface that is hardly damaged can be obtained. Thus, this CD can be used as a compact mirror in addition to its original use as an information recording medium.

FIG. 2 is a schematic sectional view showing a second embodiment of the optical disk of the present invention. A DVD having two-layer recording pits in which two substrates are bonded will be described. A substrate 21 having signal pits 20 on one side is formed by injection molding. On the surface of the substrate 21 on the signal pit 20 side, a reflective layer 22 made of an Al alloy is formed to a thickness of 60 to 90 nm by sputtering.

Next, an acrylic UV curable resin is applied on the reflective layer 22 by spin coating to a thickness of 3 to 7 μm, and is cured by irradiating UV rays to form the first resin layer 2.
Form 3 Next, on the first resin layer 23, 95-97% by weight of Al and Si, Fe, M
An alloy containing a total of 3 to 5% by weight of g · Mn · Zn · Ti is formed into a film having a thickness of 70 to 110 nm by sputtering to form a mirror surface layer 24. The mirror surface layer 24 is a mirror surface that does not transmit light.

Next, on the mirror surface layer 24, an acrylic ultraviolet curable resin is applied to a thickness of 2 to 6 μm by spin coating, and is cured by irradiating ultraviolet rays to form a second resin layer. Next, in a predetermined part of the second resin layer 25, information such as a name is printed on the printing layer 26 having a thickness of 10 to 40 μm by a screen printing method using an ultraviolet-curable opaque ink. Form.

On the other hand, the substrate 29 having the signal pits 60 on one side is formed by injection molding. On the surface of the substrate 29 on the signal pit 60 side, a translucent reflective layer 28 made of an Al alloy is formed to a thickness of 60 to 90 nm by sputtering. The surface opposite to the pit formation surface side of the substrate 21 and the pit formation surface side of the substrate 29 face each other, and are bonded with the adhesive layer 27. As a result, a DVD having a beautiful mirror surface with no oxidative discoloration on the mirror surface and hardly scratched can be obtained. Thus, this DVD can be used as a compact mirror in addition to its original use as an information recording medium.

(Embodiment 3) FIG. 3 is a schematic sectional view showing a third embodiment of the optical disk of the present invention. 8cm or 1
A CD having an outer diameter of 2 cm will be described. The transparent substrate 31 having the signal pits 30 on one surface is formed by injection molding. On the surface of the substrate 31 where the signal pits 30 are formed, a reflective layer 32 made of an Al alloy is formed to a thickness of 60 to 90 nm by sputtering.

Next, on the reflective layer 32, an opaque ink is added to an acrylic UV-curable resin, and a uniform resin is applied to a thickness of 3 to 7 μm by a spin coating method, and is cured by irradiating UV rays. The first resin layer 33 is formed. Next, a mirror surface layer 34 made of an alloy containing 95 to 97% by weight of Al and 3 to 5% by weight of Si, Fe, Mg, Mn, Zn, and Ti as impurities is added to the first resin layer 33 by sputtering. It is formed to a thickness of 70 to 110 nm.
This mirror surface layer 34 is a mirror surface that does not transmit light.

Next, an acrylic UV curable resin is applied on the mirror surface layer 34 to a thickness of 2 to 6 μm by spin coating, and is cured by irradiating UV rays to form a second resin layer 35.
To form The second resin layer 35 protects the mirror layer 34. Next, at a predetermined part of the second resin layer 35,
A printing layer 36 having a thickness of 10 to 40 μm is formed on the information such as the name by using a UV-curable opaque ink by a screen printing method. As described above, it is possible to obtain a CD having a beautiful mirror surface with no oxidative discoloration on the mirror surface and hardly scratched. Thus, this CD can be used as a compact mirror in addition to its original use as an information recording medium.

(Embodiment 4) FIG. 4 is a schematic sectional view showing a fourth embodiment of the optical disk of the present invention. 8cm or 1
A CD having an outer diameter of 2 cm will be described. The transparent substrate 41 having the signal pits 40 on one side is formed by injection molding. On the surface of the substrate 41 where the signal pits 40 are formed, a reflective layer 42 made of an Al alloy is formed to a thickness of 60 to 90 nm by sputtering.

Next, an opaque ink is added to the acrylic UV-curable resin, and a uniform resin is applied to the reflective layer 42 by spin coating to a thickness of 3 to 7 μm, and is cured by irradiating UV rays. The first resin layer 43 is formed. Next, an ultraviolet curable resin is applied on the first resin layer 43 by a spin coating method to a thickness of 3 to 7 μm, and cured by irradiating ultraviolet rays to form a print layer 47. Next, on the printed layer 47, 95 to 97% by weight of Al and Si, Fe, Mg, Mn, Zn, Ti as other impurities in a total amount of 3 to 97% are used.
A mirror surface layer 44 made of an alloy containing 5% by weight is formed to a thickness of 70 to 110 nm by sputtering. The mirror surface layer 44 is a mirror surface that does not transmit light.

Next, on the mirror surface layer 44, an acrylic UV curable resin is applied to a thickness of 2 to 6 μm by spin coating, and is cured by irradiating UV rays to form the second resin layer 4.
5 is formed. The second resin layer 45 protects the mirror surface layer 44. Next, a printing layer 46 having a thickness of 10 to 40 μm is formed on a predetermined portion of the second resin layer 45 by a screen printing method using an ultraviolet curable opaque ink for displaying information such as a name. I do.

As described above, it is possible to obtain a CD which is beautiful, has no mirror surface oxidative discoloration, and has a scratch-resistant mirror surface. In this case, due to the presence of the print layer 47, the irregularities on this surface give the mirror surface layer 44 a subtle taste. Thus, in addition to the original use as an information recording medium, this CD The name can be confirmed and it can be used as a compact mirror.

(Embodiment 5) FIG. 5 is a schematic sectional view showing a fifth embodiment of the optical disk of the present invention. FIG. 6 is a top view showing a fifth embodiment of the optical disk of the present invention. A transparent substrate 51 having an outer diameter of 8 cm on one side on a recording surface and having an outer shape (for example, an example is shown in FIG. 6) such as a human or animal face or a flower having a maximum passing length of 12 cm. Is molded by injection molding. Signal pits 50 are formed on one surface of the substrate 51.

Here, the shape of the substrate 51, which eventually becomes the optical disk 110, is not limited to a circle as shown in FIG. 6, for example. Have been. Next, this substrate 5
A reflection layer 5 made of an Al alloy
2 is formed to a thickness of 60 to 90 nm by sputtering. Next, an acrylic UV curable resin is applied on the upper reflective layer 52 to a thickness of 3 to 7 μm by spin coating, and is cured by irradiating UV rays to form the first resin layer 53.
To form

Next, on the first resin layer 53, 9
5% by weight or more, and Si, Fe, Mg,
An alloy containing Mn, Zn, and Al in a total weight of 0.5 to 5% by weight is formed into a film having a thickness of 70 to 110 nm by sputtering to form a mirror surface layer 54. Next, an acrylic UV curable resin is applied on the mirror surface layer 54 to a thickness of 2 to 6 μm by spin coating, and is cured by irradiating UV rays to form the second resin layer 55.

Next, at a predetermined position on the second resin layer 55, an ultraviolet-curable opaque ink for displaying information such as a name is used for screen printing by 10 to 40 μm.
A printing layer 56 having a thickness of m is formed. From the above,
An optical disk 1 with a beautiful design and a mirror surface with no oxidation discoloration on the mirror surface and a scratch-resistant mirror surface
00 is obtained. Thus, in addition to the original use of the CD as an information recording medium, the name of the disc can be confirmed and the CD can be used as a compact mirror.

[0024]

As described above, in the optical disk of the present invention, the reflective layer and the protective layer, or the reflective layer, the first protective layer and the print layer are sequentially formed on the surface of the transparent substrate on which the signal pits are formed. By forming a mirror surface layer and a second protective layer on the protective layer or the print layer in this order, an optical disk having a mirror function can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of an optical disk of the present invention.

FIG. 2 is a schematic sectional view showing a second embodiment of the optical disc of the present invention.

FIG. 3 is a schematic sectional view showing a third embodiment of the optical disc of the present invention.

FIG. 4 is a schematic sectional view showing a fourth embodiment of the optical disc of the present invention.

FIG. 5 is a schematic sectional view showing a fifth embodiment of the optical disk of the present invention.

FIG. 6 is a top view showing a fifth embodiment of the optical disc of the present invention.

[Explanation of symbols]

10: signal pit, 11: substrate, 12: reflective layer, 13:
1st resin layer, 14 ... mirror surface layer, 15 ... 2nd resin layer, 20 ...
Signal pits, 21 ... substrate, 22 ... reflective layer, 23 ... first resin layer, 24 ... mirror layer, 25 ... second resin layer, 26 ... printing layer, 27 ... adhesive layer, 28 ... semi-transparent reflective layer, 29 ... substrate,
30 ... signal pit, 31 ... substrate, 32 ... reflection layer, 33 ...
1st resin layer, 34 ... mirror surface layer, 35 ... 2nd resin layer, 36 ...
Printing layer, 40 signal pit, 41 substrate, 42 reflecting layer, 43 first resin layer, 44 mirror surface layer, 45 second resin layer, 46 second printing layer, 47 first printing layer, 50: signal pit, 51: substrate, 52: reflection layer, 53: first resin layer, 54: mirror surface layer, 55: second resin layer, 56: printing layer,
57: Center hole, 100: Optical disk

Claims (2)

[Claims] 1. An optical disc in which a reflective layer and a protective layer, or a reflective layer, a first protective layer, and a printed layer are sequentially formed on a surface of a transparent substrate on which signal pits are formed, wherein the protective layer or the printed layer is provided. An optical disk characterized in that a mirror surface layer and a second protective layer are sequentially formed on the layer. 2. The optical disk according to claim 1, further comprising a printed layer formed on said second protective layer.