JP3590278B2 - Optical disk and method for manufacturing optical disk - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disc and a method of manufacturing an optical disc, and more particularly, to a light reflecting layer and a protective layer on an optical disc substrate having a signal recording surface on which a signal is recorded or a signal is recorded on the other surface of the light incident surface. Also, the present invention relates to an optical disk on which a printed layer is formed and a method for manufacturing the optical disk.
[0002]
[Prior art]
Conventionally, a compact disc (hereinafter, referred to as a “CD”) has been known as this kind of optical disc.
[0003]
FIG. 1 is a sectional view of a main part of a conventional optical disk.
[0004]
The optical disc 1 includes an optical disc substrate 2 including a light incident surface 2a on which a laser beam or the like is incident and a signal recording surface 2b on which a signal is recorded by irregularities such as pits; And a transparent protective film 4 for protecting the reflective film 3 from oxidation and corrosion. Finally, a label (not shown) is printed on the protective film 4 to complete a commercial optical disk.
[0005]
In the state shown in FIG. 1, when the optical disk 1 is viewed from the protective film 4, the signal recording surface 2 b is directly viewed, as in the case where the conventional CD is viewed from the light incident surface 2 a. In a dark silver donut, a radial rainbow pattern is partially generated due to diffraction of light.
[0006]
[Problems to be solved by the invention]
In the conventional optical disk, the label is finally printed on the entire protective film 4 as described above, so that the purchaser of the optical disk 1 cannot see the optical disk 1 from the protective film 4 side. That is, this means that the view from the direction of the protective film 4 of the optical disk 1 is originally eliminated, and it cannot be said that the protective film 4 is effectively used.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an impact on a purchaser by effectively utilizing a view from the protective film 4 direction of an optical disc which is not used in a conventional optical disc. It is an object of the present invention to provide an optical disk which is attractive as a product and a method for manufacturing the optical disk.
[0008]
[Means for Solving the Problems]
An optical disk according to the present invention according to claim 1, wherein an optical disk substrate on which a signal is recorded or a signal recording surface on which a signal is recorded is formed on the other surface of the light incident surface; A first light reflection layer for reflecting light formed on the recording surface, a first protection layer formed on the light reflection layer, and a mirror-like second light reflection formed on the first protection layer And a transparent second protective layer formed on the second light reflection layer.
[0009]
An optical disc according to a second aspect of the present invention is the optical disc according to the first aspect, further comprising a printing layer formed on the second protective layer.
[0010]
The method for manufacturing an optical disk according to the present invention according to claim 3, comprising: a first step of manufacturing an optical disk substrate having a signal recording surface on which a signal is recorded or a signal is recorded on the other surface of the light incident surface; A second step of forming a first light reflecting layer for reflecting light on the signal recording surface of the optical disk substrate manufactured in one step, and forming a first protective layer on the light reflecting layer formed in the second step A third step of forming a mirror-like second light reflection layer on the first protective layer formed in the third step, and a second step of forming a mirror-like second light reflection layer on the second light reflection layer formed in the fourth step. And a fifth step of forming a transparent second protective layer.
[0011]
According to a fourth aspect of the present invention, there is provided the optical disk manufacturing method according to the third aspect, further comprising a sixth step of forming a print layer on the second protective layer formed in the fifth step. It is characterized by the following.
[0012]
The optical disk of the present invention according to claim 5, wherein an optical disk substrate having a signal recording surface on which a signal is recorded or recorded on the other surface of the light incident surface, and light formed on the signal recording surface being transmitted. A first light reflecting layer that reflects, a first protective layer formed on the light reflecting layer, a second mirror-like light reflecting layer formed on the first protective layer, and the second light reflecting layer A third light reflection layer partially formed on the second light reflection layer; and a transparent second protection layer formed on the second light reflection layer and the third light reflection layer.
[0013]
An optical disc according to a sixth aspect of the present invention is the optical disc according to the fifth aspect, further comprising a printing layer formed on the second protective layer.
[0014]
The method for manufacturing an optical disk according to the present invention according to claim 7, comprising: a first step of manufacturing an optical disk substrate having a signal recording surface on which a signal is recorded or a signal is recorded on the other surface of the light incident surface; A second step of forming a first light reflecting layer for reflecting light on the signal recording surface of the optical disk substrate manufactured in one step, and forming a first protective layer on the light reflecting layer formed in the second step A third step of forming a mirror-like second light reflection layer on the first protective layer formed in the third step, and a second step of forming a mirror-like second light reflection layer on the second light reflection layer formed in the fourth step. A fifth step of partially forming a third light-reflective layer, and a sixth step of forming a transparent second protective layer on the second light-reflective layer formed in the fifth step and the third light-reflective layer And characterized in that:
[0015]
According to an eighth aspect of the present invention, there is provided the optical disk manufacturing method according to the seventh aspect, further comprising a seventh step of forming a print layer on the second protective layer formed in the sixth step. It is characterized by the following.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 2 is a sectional view of a main part of the optical disk according to the present invention.
[0018]
Reference numeral 11 denotes an optical disk, which has a center hole 18 for attachment at the center.
[0019]
Reference numeral 12 denotes an optical disk substrate, which is manufactured by injection molding using a transparent plastic material such as polycarbonate, acrylic, or polyolefin, and is generally colorless and transparent.
[0020]
Reference numeral 12a denotes a light incident surface from which a reading or writing beam such as a laser beam is incident from below the drawing.
[0021]
Reference numeral 12b denotes a signal recording surface on which a signal is recorded by unevenness such as pits, or a groove or land is formed for recording a signal later.
[0022]
Reference numeral 13 denotes a first reflection film for reflecting a laser beam incident from the light incident surface, and an aluminum thin film is mainly deposited on the signal recording surface 12b of the injection-molded optical disk substrate 12 by sputtering.
[0023]
Reference numeral 14 denotes a transparent first protective film that protects the first reflective film 13 from oxidation and corrosion, and is formed by applying an ultraviolet curable acrylic resin on the first reflective film 13 and then irradiating it with ultraviolet light. However, the first protective film 14 is usually transparent, but is not limited thereto.
[0024]
Reference numeral 15 denotes a second reflection film for reflecting natural light incident from a second protection film 16 to be described later. For example, an aluminum thin film is deposited on the first protection film 14 by sputtering to form a complete mirror surface. Unlike the case where the light is incident on the light incident surface 12a, a radial rainbow pattern is not partially generated in a dull silver color. The metal used for coloring the second reflective film 15 with a color other than silver (that is, the color of the aluminum thin film) is, in addition to aluminum, gold, titanium, copper, nickel, antimony, manganese, and the like. Not only metals that can be deposited, but also plastics and the like other than metals can be used.
[0025]
Reference numeral 16 denotes a transparent (but not necessarily colorless) second protection film for protecting the second reflection film 15 from oxidation and corrosion, similarly to the first protection film 14. It is formed by applying an ultraviolet ray after applying an ultraviolet curing acrylic resin.
[0026]
Reference numeral 17 denotes a print layer which is generally called a label, and displays the content of information such as music recorded on the optical disc 11. Conventionally, this printing layer covers the entire optical disk 11 in a donut shape. However, in the optical disk 11 according to the present invention, the second reflective film 15 and the second protective film 16 form a gold mirror surface. In order to make effective use of the beauty of the mirror surface, characters such as album titles, singer names, song names, and artist photos are partially printed.
[0027]
Next, a method for manufacturing an optical disk according to the present invention will be described in detail with reference to the drawings.
[0028]
FIG. 3 is a plan view showing a change of the optical disk according to the optical disk manufacturing method according to the present invention.
[0029]
In FIG. 3A, reference numeral 21 denotes an optical disk in which a first reflective film and a first protective film are formed on a signal recording surface of an optical disk substrate manufactured by injection molding by a conventional method. A center hole 22 is provided.
[0030]
In FIG. 3B, reference numeral 23 denotes a first mask, which covers a central portion of the optical disk 21 in order to prevent deposition of aluminum, gold, or the like, which serves as a second reflection film.
[0031]
Reference numeral 24 denotes a second mask, like the first mask 23, which covers the outer peripheral portion of the optical disk 21 so as not to deposit the second reflection film.
[0032]
FIG. 4 is a plan view showing a change of the optical disk according to the optical disk manufacturing method according to the present invention.
[0033]
In FIG. 4A, reference numeral 25 denotes an optical disk in which a second reflective film 26 is formed on a first protective film, and portions not covered by the first mask 23 and the second mask 24 are shown in FIG. A second reflective film 26 of, for example, aluminum, which is painted black, is formed by vapor deposition.
[0034]
FIG. 4B shows the optical disk 25 from which the first mask 23 and the second mask 24 are removed from the optical disk 25 shown in FIG.
[0035]
The second reflection film 26 covers the optical disk 25 in a donut shape, but no light reflection film is formed on the inner peripheral portion and the outer peripheral portion 4.
[0036]
Through these steps, the optical disc 25 is coated with an ultraviolet-curable acrylic resin on the second reflective film 26, and then is irradiated with ultraviolet rays to form a transparent protective layer, and a label is printed to complete the optical disc product. .
[0037]
FIG. 5 is a plan view showing an example of the third mask used in the optical disc manufacturing method according to the present invention.
[0038]
Reference numeral 27 denotes a third mask, and four cutout portions 27a for depositing gold or the like (preferably a metal different from the second reflective film) serving as a third reflective film on the optical disk 25 shown in FIG. 4B. Is formed.
[0039]
FIG. 6 is a plan view showing a change of the optical disk according to the optical disk manufacturing method according to the present invention.
[0040]
Reference numeral 28 denotes an optical disk in which a third reflective film 29a is formed on the optical disk 25 shown in FIG. 4B, and four star-shaped, eg, gold, are formed on the second reflective film 26 in a portion not covered by the third mask 27. Is formed by vapor deposition.
[0041]
Through these steps, the optical disc 28 forms a transparent protective layer by irradiating ultraviolet rays after applying an ultraviolet curable acrylic resin on the second reflective film 26 and the four star-shaped third reflective films 29a. The label is printed and completed as an optical disk product.
[0042]
【The invention's effect】
As described above, according to the optical disk and the method of manufacturing the optical disk according to the present invention, a metal layer is vapor-deposited and a transparent protective layer is further formed on the protective layer of the optical disk on which a label has only been printed, and mirror finishing is performed. As a result, the disc itself will bring out the beauty that cannot be reproduced by the label, making it a very attractive optical disc product for purchasers, and as a result, a significant increase in sales is expected.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of a conventional optical disk.
FIG. 2 is a sectional view of a main part of an optical disc according to the present invention.
FIG. 3 is a plan view showing a change in an optical disc according to the optical disc manufacturing method according to the present invention.
FIG. 4 is a plan view showing a change of the optical disk according to the optical disk manufacturing method according to the present invention.
FIG. 5 is a plan view showing an example of a third mask used in the optical disc manufacturing method according to the present invention.
FIG. 6 is a plan view showing a change of the optical disk according to the optical disk manufacturing method according to the present invention.
[Explanation of symbols]
Reference Signs List 11 optical disk 12 optical disk substrate 12a light incident surface 12b signal recording surface 13 first reflective film 14 first protective film 15 second reflective film 16 second protective film 17 print layer 18 center hole 21 optical disk 23 first mask 24 second mask 25 Optical disk 26 Second reflective film 27 Third mask 27a Cutout portion 28 Optical disk 29a Third reflective film

Claims (8)

An optical disc substrate having a signal recording surface on which a signal is recorded or recorded on the other surface of the light incident surface,
A first light reflection layer that reflects light formed on the signal recording surface;
A first protective layer formed on the light reflecting layer;
A mirror-like second light reflection layer formed on the first protection layer;
A transparent second protective layer formed on the second light reflecting layer;
An optical disc, comprising: The optical disc according to claim 1,
A printing layer formed on the second protective layer,
An optical disc, comprising: A first step of producing an optical disc substrate having a signal recording surface on which a signal is recorded or recorded on the other surface of the light incident surface;
A second step of forming a first light reflecting layer for reflecting light on the signal recording surface of the optical disk substrate produced in the first step;
A third step of forming a first protective layer on the light reflecting layer formed in the second step;
A fourth step of forming a mirror-like second light reflecting layer on the first protective layer formed in the third step;
A fifth step of forming a transparent second protective layer on the second light reflecting layer formed in the fourth step;
A method for manufacturing an optical disk, comprising: The method for manufacturing an optical disc according to claim 3,
A sixth step of forming a print layer on the second protective layer formed in the fifth step,
A method for manufacturing an optical disk, comprising: An optical disc substrate having a signal recording surface on which a signal is recorded or recorded on the other surface of the light incident surface,
A first light reflection layer that reflects light formed on the signal recording surface;
A first protective layer formed on the light reflecting layer;
A mirror-like second light reflection layer formed on the first protection layer;
A third light reflection layer partially formed on the second light reflection layer,
A transparent second protective layer formed on the second light reflecting layer and the third light reflecting layer;
An optical disc, comprising: The optical disc according to claim 5,
A printing layer formed on the second protective layer,
An optical disc, comprising: A first step of producing an optical disc substrate having a signal recording surface on which a signal is recorded or recorded on the other surface of the light incident surface;
A second step of forming a first light reflecting layer for reflecting light on the signal recording surface of the optical disk substrate produced in the first step;
A third step of forming a first protective layer on the light reflecting layer formed in the second step;
A fourth step of forming a mirror-like second light reflecting layer on the first protective layer formed in the third step;
A fifth step of partially forming a third light reflection layer on the second light reflection layer formed in the fourth step;
A sixth step of forming a transparent second protective layer on the second light reflecting layer and the third light reflecting layer formed in the fifth step;
A method for manufacturing an optical disk, comprising: The method for manufacturing an optical disk according to claim 7,
A seventh step of forming a printing layer on the second protective layer formed in the sixth step,
A method for manufacturing an optical disk, comprising:

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