JPH1011803A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk which enables even a visually handicapped person to check the items associated with the recording contents of the disk simply by touching the disk and hardly generates flaws on a label layer. SOLUTION: The surface of the label layer 105 of the optical information recording medium provided with a transparent substrate 101 having a recording surface 102 recorded with information, a reflection layer 103 formed to cover this recording surface 103, a protective layer 104 formed to cover this reflection layer 103 and the label layer 105 formed on the surface of this protective layer 104 and printed with the display of the items associated with the information of the recording surface includes a braille layer 106 formed by displaying the items associated with the information of the recording surface 102 on the surface of the label layer 105 with braille.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium for reproducing information recorded on a recording surface formed on a substrate by irradiating a light beam from one surface.

[0002]

2. Description of the Related Art A pit corresponding to recording information is formed on one surface of a transparent substrate, and a pit corresponding to the recording information is formed. The pit is focused on the pit through the transparent substrate. Compact discs (CD: Compac)
t Disc) is a typical example.

[0003] The structure of a CD is such that a recording surface formed on a transparent substrate is made of aluminum (A) which reflects most of a laser beam.
1), and is covered with a reflective film made of a metal such as gold (Au), and a protective layer made of an ultraviolet curable resin or the like is formed on the reflective film. Finally, information related to the information on the recording surface such as a disc title is printed on the protective layer to form a label layer.

A digital video disk (DVD: Digital Video Diode) whose recording density is increased to about 6 to 8 times that of a CD
sc) is under development. Many specifications have been proposed for DVDs with different recording capacities and functions. DVD-5 has a first transparent substrate having a recording surface of 120 mm in diameter and 0.6 mm in thickness and a second transparent substrate of 120 mm in diameter and 0.6 mm in thickness, and an adhesive layer having a thickness of about 40 μm. And the recording surface is covered with a reflective film that reflects most of the laser light.

[0005] Single-sided playback DVD having two recording surfaces
In the case of -9, the surface of the first recording surface is covered with a translucent film that transmits part of the laser light and reflects the rest, and the surface of the second recording surface is covered with a reflective film that reflects most of the laser light. Have been done. The first and second transparent substrates are bonded together via an adhesive layer having a thickness of about 40 μm so that the recording surfaces of the first and second transparent substrates face inward. A label layer is formed on which information related to the information on the second recording surface is printed.

[0006]

As described above, conventional optical disks such as CDs and DVDs have information related to information on the recording surface such as a disk title printed on the surface opposite to the surface from which information is read. A label layer is formed.
However, in the conventional label display, a visually impaired person cannot distinguish between the front and back sides of an optical disk (especially in the case of a DVD), and cannot know the contents of information on the recording surface of the optical disk. In order to confirm the contents, it is necessary to actually reproduce the contents one by one with the player, which is inconvenient.

In addition, in the case of conventional optical discs such as CDs and DVDs, the label layer formed by printing is exposed, so that if the handling of the optical disc is abandoned,
Scratches and the like occurred in the label layer, which greatly impaired the appearance of the optical disc. If the scratch is deeper, the recording signal may be damaged and seriously affect reproduction characteristics.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In an optical disk, even a visually impaired person can confirm items related to the recorded contents of the disk by simply touching the disk. It is another object of the present invention to provide an optical disk in which a label layer is hardly damaged.

[0009]

According to a first aspect of the present invention, there is provided a transparent substrate having a recording surface on which information is recorded;
A reflective layer formed so as to cover the recording surface, a protective layer formed so as to cover the reflective layer, and a label layer formed on the surface of the protective layer and displaying information related to the information on the recording surface by printing An optical information recording medium comprising: a Braille layer on a surface of a label layer, in which items related to information on a recording surface are represented by Braille.

According to a second aspect of the present invention, there is provided a first transparent substrate having a recording surface on which information is recorded, a reflective layer formed so as to cover the recording surface, an adhesive layer, and a second transparent substrate. A label having a transparent substrate, wherein the reflective layer and the second transparent substrate are bonded together via an adhesive layer, and a label formed on the surface of the second transparent substrate and displaying information relating to the recording surface and related matters by printing; An optical information recording medium comprising a layer and a layer comprising a Braille layer on the surface of the label layer, in which items related to information on the recording surface are represented by Braille.

According to a third aspect of the present invention, a first transparent substrate having a recording surface on which information is recorded, a reflective layer formed so as to cover the recording surface, an adhesive layer, A transparent substrate and a label layer formed on one surface of the second transparent substrate and printed by printing so that the display of information related to the information on the recording surface can be viewed directly through the second transparent substrate. In the optical information recording medium in which the reflective layer and the label layer are bonded together via the adhesive layer, items related to the information on the recording surface are written on the surface of the second transparent substrate on which the label layer is not applied. And a braille layer represented by

According to a fourth aspect of the present invention, there is provided a first transparent substrate having a first recording surface on which information is recorded;
, A transparent adhesive layer, a second transparent substrate having a second recording surface on which information is recorded, and a second transparent substrate formed so as to cover the second recording surface. Having a reflective layer, a translucent layer and a reflective layer bonded together via a transparent adhesive layer, and formed on a surface of a second transparent substrate and related to information on the first recording surface and the second recording surface. An optical information recording medium comprising: a label layer on which the indication of (1) is provided by printing; and a Braille layer on the surface of the label layer, in which items related to the information on the first recording surface and the second recording surface are represented by Braille. It is characterized by doing.

The invention according to claim 5 of the present invention is the invention according to claim 1.
5. The optical information recording medium according to claim 4, wherein the braille layer is made of an ultraviolet curable resin transparent to visible light by 2P.
It is characterized by being molded by a method.

[0014] The invention according to claim 6 of the present invention is the invention according to claim 3.
The optical information recording medium described above, wherein the Braille layer is directly formed on the surface of the second transparent substrate by injection molding.

The invention according to claim 7 of the present invention is the invention according to claim 2.
6. The optical information recording medium according to claim 5, wherein a region of the second transparent substrate on which the Braille layer is formed is a concave portion.

According to the first to fourth aspects of the present invention, Braille having a Braille representing information related to information on a recording surface is provided on a surface opposite to a surface on which a reproduction laser beam of CD and DVD is incident. Since the layer is provided, it is possible for a visually impaired person to easily know information related to the information on the recording surface of the CD and DVD. In addition, since the Braille layer is provided on one surface of the optical disk, the front and back of the optical disk can be known only by the feeling of the hand, not only for the visually impaired.

According to the invention described in claim 5 of the present invention, 2
A transparent UV curable resin was molded by the P (Photo Polymerization) method to provide a Braille layer, so that the underlying label layer could be seen through, so there was no effect on the visibility of the label layer, and Braille was applied over a large area. Can be formed.

If the Braille layer is formed so as to cover the entire surface of the label layer, the Braille layer serves to protect the label layer, so that the label layer can be protected from scratches and the like.
The appearance and reproduction characteristics of the optical disk are not impaired.

According to the third and sixth aspects of the present invention, the label layer is provided between the adhesive layer and the second transparent substrate, and the Braille layer is provided on the surface of the second transparent substrate. In addition, the label layer is not exposed on the surface, and the label layer is not directly scratched. Also, information on the label layer can be visually recognized through the second transparent substrate and the Braille layer.

According to the seventh aspect of the present invention, since the area where the Braille layer is formed is a concave portion lower than the surrounding flat surface, the optical disk can be mounted on a case, a turntable or the like. In addition, rattling due to the braille projection does not occur. In addition, since it is difficult for the convex portion of the Braille to come into contact with an external object, the Braille does not wear out due to friction or the like.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of an optical disk having a CD-type single-plate structure according to the present invention. The cross-sectional structure of the optical disc of this embodiment is
After covering the recording surface 102 formed on one side with a reflective film 103 made of Al, Au or the like, forming a protective layer 104 made of an ultraviolet curable resin or the like thereon, Label layer 105 formed by printing
, And a Braille layer 106 made of an ultraviolet curable resin or the like and formed by Braille showing items related to information on the recording surface 102.

Here, the Braille layer 106 is a label layer 10
5 also serves as a protective layer for protecting the element 5 from damage due to external factors. Since the Braille layer 106 is transparent, it does not affect the visual inspection of the label layer 105 located below.

Next, a method of manufacturing the optical disk of this embodiment will be described. FIG. 2 shows a CD having a single-plate structure according to the present invention.
FIG. 4 is a schematic view showing one embodiment of a method for manufacturing a type optical disk. First, as shown in FIG. 2A, a first stamper 201 on which a signal is recorded in a format conforming to the CD standard is formed of a resin such as polycarbonate, and has a diameter of 120 mm, a thickness of 1.2 mm, and a diameter of 1.2 mm. A transparent substrate 101 having a center hole of 15 mm and a recording surface 102 is manufactured by injection molding.

Subsequently, as shown in FIG.
After a reflective film 103 is formed on the surface of the recording surface 102 formed by the sputtering method or the like by a sputtering method or the like, as shown in FIG. 2C, an ultraviolet curable resin or the like is applied as a protective layer 104 by a spin coating method.

Further, as shown in FIG.
The label layer 105 on which items related to the information 2 are written is printed. Then, as shown in FIG.
5, a Braille layer 106 is formed by a 2P method using a second stamper 202 in which items related to information on the recording surface 102 are recorded in advance as Braille information. As described above, a CD-type optical disk having a single-plate structure and having the Braille layer 106 according to the present invention can be obtained.

FIG. 3 is a cross-sectional view of a bonded structure according to the present invention.
FIG. 2 is a schematic diagram showing one embodiment of a VD-5 type optical disc. The cross-sectional structure of the optical disk of the present embodiment has a recording surface 30.
2, a first transparent substrate 301 on which a reflective film 303 made of Al, Au or the like is formed, and a label layer 305 on one side formed by printing information related to the information on the recording surface 302 such as a disc title by printing. And the label layer 305
A second transparent substrate 304 on which a Braille layer 306 made of an ultraviolet curable resin or the like and showing information related to the information on the recording surface 302 in Braille is formed. Braille layer 30 of second transparent substrate 304
6 has a structure in which the surfaces are not bonded to each other.

Here, the Braille layer 306 is the label layer 30
5 also serves as a protective layer for preventing damage from external factors. Further, since the braille layer 306 is transparent, it does not affect the visual inspection of the label layer 305 located below.

FIG. 4 is a cross-sectional view of a bonded structure according to the present invention.
It is a schematic diagram which shows an Example of the manufacturing method of the optical disk of VD-5 type. First, as shown in FIG. 4A, a first signal in which a signal is recorded in a format conforming to the DVD standard is used.
Made of a resin such as polycarbonate, having a diameter of 120 mm, a thickness of 0.6 mm, and a diameter of 15 mm.
A first transparent substrate 301 having a center hole of mm and a recording surface 302 is manufactured by injection molding.

Subsequently, as shown in FIG. 4B, a reflective film 3 is formed on the surface of the recording surface 302 formed on the first transparent substrate 301.
03 is formed by a sputtering method or the like. FIG.
As shown in (c), a label layer 305 on which items related to information on the recording surface 302 are written is formed by printing.

Further, as shown in FIG. 4D, on the surface of the label layer 305, a second stamper 4 in which items related to the information on the recording surface 302 are recorded in advance by Braille information.
02 on the surface on one side of the second transparent substrate 304
A Braille layer 306 is formed by molding an ultraviolet curable resin by the P method.

Then, as shown in FIG.
An adhesive layer 307 is applied to the surface of the second transparent substrate 30.
4 and the surface on which the Braille layer 306 is not formed and the reflective film 303
Glue them so that they face each other. As described above,
It is possible to obtain a DVD-5 type optical disk having a braille layer 306 and having a laminated structure according to the present invention.

As another embodiment of the present embodiment, the label layer 30 is disposed between the adhesive layer 307 and the second transparent substrate 304.
5 may be provided. In this case, instead of the Braille layer 306 formed by molding the ultraviolet curable resin by the 2P method, Braille is directly applied to the second transparent substrate 304 by using a stamper in which items related to the information on the recording surface 302 are recorded in advance by Braille information. Injection molding may be used.

FIG. 5 is a schematic view showing an embodiment of a DVD-9 type optical disk having a two-layer single-sided reproduction type bonding structure according to the present invention. Sectional structure of an optical disc according to the present invention, the first recording surface 502, a semi-transparent silicon nitride with respect to the reproducing laser beam covering the (Si _x N _y) or a dielectric such as aluminum nitride (Al _x N _y) And the like. A first transparent substrate 501 on which a semi-transparent film 503 made of, for example, is formed, a second recording surface 505, and a second transparent substrate on which a reflective film 506 made of Al, Au, or the like is formed. 504 and a translucent film 503 and a reflective film 50 via a transparent adhesive layer 507.
6 and the second transparent substrate 50
A label layer 508 is formed by printing on the surface of No. 4, and a Braille layer 509 is further formed thereon by a 2P method using a stamper in which Braille information is recorded in advance.

Here, the Braille layer 509 is the label layer 50
8 also serves as a protective layer for preventing damage from external factors. Also, since it is transparent, the lower label layer 5
There is no effect on viewing 08. As described above, it is possible to obtain a DVD-5 type optical disk having the braille structure according to the present invention and including the Braille layer 509.

FIG. 6 shows the D of the bonded structure according to the present invention.
FIG. 3 is a schematic diagram of an embodiment of a VD type optical disk. As shown in FIG. 6, a region where the Braille layer 602 is formed on the surface of the second transparent substrate 601 is a concave portion 604 lower than the surrounding flat surface 603.

The concave portion 604 may be formed by providing a convex portion facing the concave portion 604 in a mold used for injection molding the second transparent substrate. Here, the depth of the concave portion 604 needs to be equal to or greater than the thickness of the Braille layer.

According to the structure of this embodiment, when the optical disk is placed on the case or the turntable, the braille projection does not directly touch the surface of the case or the turntable.
It is possible to prevent rattling due to the projections of the Braille layer. In addition, since the projections of the Braille are less likely to come into contact with external objects, the Braille does not wear out due to friction or the like.

[0038]

The optical information recording medium of the present invention is provided with a Braille layer having Braille on the surface of the label layer, which indicates items related to the information on the recording surface, so that even a visually impaired person can easily use it. The content recorded on the optical information recording medium or the front and back of the optical information recording medium can be confirmed.

Further, since the Braille layer covers the surface of the label layer, the label layer is not easily damaged, so that the appearance of the optical information recording medium is not impaired by the occurrence of scratches and the reproduction characteristics are not deteriorated.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an optical disk having a CD-type single-plate structure according to the present invention.

FIG. 2 is a schematic view showing one embodiment of a method for manufacturing a CD type optical disk having a single-plate structure according to the present invention.

FIG. 3 is a schematic view showing an embodiment of a DVD-5 type optical disk having a bonding structure according to the present invention.

FIG. 4 is a schematic view showing one embodiment of a method of manufacturing a DVD-5 type optical disk having a bonded structure according to the present invention.

FIG. 5 is a schematic view showing an embodiment of a DVD-9 type optical disk having a two-layer single-sided reproduction type bonding structure according to the present invention.

FIG. 6 is a schematic view of an embodiment of a DVD type optical disk having a bonding structure according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Transparent substrate 102 Recording surface 103 Reflective film 104 Protective layer 105 Label layer 106 Braille layer 201 First stamper 202 Second stamper 301 First transparent substrate 302 Recording surface 303 Reflective film 304 Second transparent substrate 305 Label layer 306 Braille layer 307 Adhesive layer 401 First stamper 402 Second stamper 501 First transparent substrate 502 First recording surface 503 Translucent film 504 Second transparent substrate 505 Second recording surface 506 Reflective film 507 Transparent adhesive layer 508 label layer 509 Braille layer 601 second transparent substrate 602 Braille layer 603 plane 604 recess

Claims (7)

[Claims] A transparent substrate having a recording surface on which information is recorded; a reflective layer formed to cover the recording surface; a protective layer formed to cover the reflective layer; An optical information recording medium comprising a label layer formed on the surface and displaying the information related to the information on the recording surface by printing, and the information related to the information on the recording surface on the surface of the label layer by Braille. An optical information recording medium comprising a Braille layer as shown. A first transparent substrate having a recording surface on which information is recorded, a reflective layer formed so as to cover the recording surface, an adhesive layer, and a second transparent substrate. A reflective layer and the second transparent substrate are bonded together via the adhesive layer, and a label layer formed on the surface of the second transparent substrate and displaying information related to the information on the recording surface by printing. An optical information recording medium comprising: a Braille layer on a surface of the label layer, in which items related to information on the recording surface are represented by Braille. 3. A first transparent substrate having a recording surface on which information is recorded, a reflective layer formed to cover the recording surface, an adhesive layer, a second transparent substrate, and the second transparent substrate. A label layer formed on one surface of a transparent substrate and printed by printing so that an indication of information related to the information on the recording surface can be viewed directly through the second transparent substrate; In an optical information recording medium in which a layer and the label layer are bonded via the adhesive layer, items related to the information on the recording surface on a surface of the second transparent substrate on which the label layer is not applied are written in Braille. An optical information recording medium comprising a Braille layer as shown. 4. A first transparent substrate having a first recording surface on which information is recorded, a semi-transparent layer formed so as to cover the first recording surface, a transparent adhesive layer, and information recorded thereon. A second transparent substrate having a formed second recording surface, and a reflective layer formed so as to cover the second recording surface, wherein the translucent layer and the reflective layer are interposed through the transparent adhesive layer. Optical information recording, comprising: a label layer formed on the surface of the second transparent substrate, the label having information on the first recording surface and the information on the second recording surface related thereto printed thereon. In the medium, the first recording surface and the second recording surface are provided on a surface of the label layer.
An optical information recording medium comprising a Braille layer in which items related to the information on the recording surface are represented by Braille. 5. The optical information recording medium according to claim 1, wherein said Braille layer is formed by molding an ultraviolet curable resin transparent to visible light by a 2P (Photo Polymerization) method. An optical information recording medium, characterized in that: 6. The optical information recording medium according to claim 3, wherein:
The optical information recording medium according to claim 1, wherein the Braille layer is directly formed on the surface of the second transparent substrate by injection molding. 7. The optical information recording medium according to claim 2, wherein a region of the second transparent substrate where the Braille layer is formed is a concave portion. Optical information recording medium.