JPH10162437A - Optical recording medium with label - Google Patents

Abstract

(57) [Problem] To label an optical recording medium in which substrates each provided with an information layer are adhered, the type of medium being irradiated with reproduction light from both sides. A digital versatile disk in which a side A information area is provided on one side of a disk substrate 10a and a side B information area is provided on one side of a disk substrate 10b. The information amount recorded on the side B is smaller than the information amount recorded on the side A, and the printing area of the label 30 can be provided outside the side B information area. Label 3
0 can be added by a pit art pattern or screen printing. In reproducing any information area, the reproduction light is not blocked by the label 30.

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,
More specifically, the present invention relates to a digital versatile disk (DVD) provided with a label for displaying the content of information recorded, a title, and the like.

[0002]

2. Description of the Related Art Compact disc (CD), CD-R
In a read-only optical recording medium such as an OM and a write-once optical recording medium such as a CD-R (recordable), a reflective film or a protective film is formed on a substrate on which information is recorded in the form of a prepit on an information recording surface. Be formed. At the time of reproduction, information is reproduced by inputting reproduction light from the side (substrate side) where the reflection film or the like is not formed and detecting the reflected light. Normally, a part of the surface of the optical recording medium is printed with the contents of the recorded information, for example, a title label indicating a software title or a music title, or a warning label such as a copyright warning. In the optical recording medium such as the CD or the like, since reproduction light is incident from the substrate side when reproducing information, a label can be printed on the opposite surface, that is, the side on which the reflective film or the like is formed.

A recently developed digital versatile disk (hereinafter referred to as a DVD) can record 133 minutes of digital video with an average data transfer rate of 4.7 Mbit / sec on one side (4.7 gigabytes as digital information). It is expected to replace software supply media such as laser disks (LDs) and video tapes, and is expected to spread rapidly in the future.

[0004]

SUMMARY OF THE INVENTION However, DVD
Has a structure in which two recording layers are sandwiched between two substrates, and there is a problem in a place where a label is printed. For example, in the case where title software in which digital video information, digital audio information, and the like compressed by MPEG2 is 4.7 GB or more is recorded, the DVD has a dual layer (DL) type DVD and a double side (DS).
Type DVDs are conceivable. Dual-layer DVD
Is to form an information layer on each of two substrates, provide a translucent film on the surface of one substrate on which the information layer is formed, and form a reflective film on the surface of the other substrate on which the information layer is formed. It is manufactured by filling two substrates with an adhesive so that the information layers face inward and the distance between the information layers is about 40 μm. Alternatively, a single-layer substrate with a translucent film is formed once, the second information layer is transferred by a photopolymerization method, a reflective film is formed, and then a dummy plate is bonded. it can.
At the time of reproduction of a dual-layer DVD, reproduction light is emitted from one substrate side so as to focus on each of two information layers. On the other hand, a double-sided DVD has a structure in which information is recorded on two substrates and the two substrates are bonded together with the information recording surface of the two substrates facing inward. Information is reproduced by irradiating the substrate surface opposite to the surface (from both sides of the DVD) with reproduction light.

[0005] In the dual-layer type DVD, as in the case of the CD, since the reproduction light is incident on only one surface of the disk, label printing can be performed on the other disk surface. However, in the case of a double-sided DVD, it is necessary to devise a place for printing a label because reproduction light is incident on both sides of the disc.

An object of the present invention is to provide an optical recording medium with a label of a type in which reproduction light is irradiated to both surfaces of the optical recording medium.

[0007]

According to a first aspect of the present invention, two substrates each having an information recording area provided on one surface of a disc-shaped substrate are provided. In an optical recording medium bonded with the surfaces facing inward, the recording capacities of the information recording areas of the two substrates are different from each other and at least part of the outer area of the information recording area having the smaller recording capacity. An optical recording medium with a label provided with a bell is provided. In the present specification, "label" means not only a label such as a title label or a warning label indicating a warning or the like of information recorded on an optical recording medium, but also any display and expression attached to the optical recording medium. It is a concept showing.

In the present invention, the information recording area provided with the information recording area
It is intended for an optical recording medium formed by bonding two substrates. For example, a DVD having a diameter of 120 mm in which title software whose compressed digital information is 4.7 gigabytes to 7.1 gigabytes is recorded. The above information amount corresponds to the standard recording time of 200 minutes, and is considered to be applicable to many title software. In the present invention, this type of D
When information is recorded on the VD, 4.7 A is recorded on the side A of the DVD.
An area for recording gigabytes of information is provided, and an area for recording the remaining information is provided on side B. That is, while the outermost recording area of the side A recording area has a diameter of 116 mm, the outermost recording area of the side B has a diameter of 9 mm.
9 mm is sufficient, and it is sufficient to record up to 101 mm including the lead-out. In the area outside the diameter of 101 mm,
In accordance with the present invention, a label is provided by printing or forming a pit art pattern. In particular, 1.3 on Side B
When information of less than gigabyte is recorded, the outermost recording area of the side B has a diameter of 79 mm or less, and a label area can be secured outside the diameter of 80 mm including the lead-out area, which is sufficient when recording a warning label. Area. When the information amount of the side B is 0.8 GB or less, the outermost diameter of the information recording area becomes about 68 mm or less,
Even if the necessary lead-out area is included, it is sufficient to record up to the minimum recording radius of 70 mm in diameter, and label printing can be performed in an area outside this.

In the optical recording medium of the present invention, the label can be attached to a substrate surface opposite to the surface on which the information recording area is provided, or to the same surface as the surface on which the information recording area is provided. . According to the present invention, when the label is attached to the same surface as the surface on which the information recording area is provided, the label can be formed by a pre-pit pattern. DVD is particularly suitable as the optical recording medium of the present invention. Note that the DVD is not limited to the read-only type, but is also applicable to a write-once or rewritable type DVD.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1-1 In this embodiment, a DVD with a label having a sectional structure as shown in FIG. 1 is manufactured. A method of manufacturing a DVD with a label will be described with reference to the flowchart of FIG. Two MPEG2 compression / compression systems consisting of environmental video software with a digital information amount of 4.4 gigabytes and attached software with 0.7 gigabytes of recording location and guide information around it
The edited master file data is input to a laser beam recorder (LBR) via a DVD physical format encoder and recorded on a photoresist master. Radius of master for duplication of side A 22.6 mm to 58.
5 mm is partitioned as a side A information area including a lead-in and lead-out area, and information (master file 1) is recorded therein. The master for Side B duplication has a radius of 2 including the lead-in and lead-out areas (1 mm width).
The area from 2.6 mm to 35.0 mm is partitioned as a side B information area, and the remaining information (master file 2) is recorded.

[0011] The photoresist master recording the data of each of the side A and the side B is developed to form a conductive film, and the stamper 1 and the stamper 2 are formed by plating, backside polishing, resist removal, and inner and outer diameter processing, respectively. Make it. Each stamper was attached to the mold of an injection molding machine manufactured by Meiki Seisakusho, and the polycarbonate resin AD550 manufactured by Teijin Chemicals was used.
3, using a mold temperature of 100 to 120 ° C. and a resin temperature of 32.
The substrate was formed under the conditions of 0 to 380 ° C. and a cycle time of 4 to 6 seconds, and a substrate 1 (10a in FIG. 1) and a substrate 2 (10b in FIG. 1) having an outer diameter of 120 mm, an inner diameter of 15 mm, and a substrate thickness of 0.6 mm. ) Are prepared.

An aluminum reflective film 12 having a thickness of about 50 nm is formed on the information recording surface (the surface on which the pits are formed) of the substrate obtained by using a sputtering apparatus, and the surface is spin-coated with an ultraviolet curable resin. The protective film 14 is formed by an ultraviolet curing process.

A flash curable adhesive 16 is applied to the surface of the protective film on each of the side A and side B substrates, irradiated with ultraviolet rays, and then the two substrates are bonded together and aged for 5 to 10 minutes. To cure.

Next, the title label 20 of this software is printed on the substrate 10 on the side B by using a screen printing machine in an area having a diameter of 72 mm to 116 mm. Thus, a DVD having a structure as shown in the partial sectional view of FIG. 1 is obtained. When the side A of the DVD software is played on a DVD player, normal video software is reproduced, and when the side B is reproduced, guide information can be accessed.

In the above example, the lead-out area of the side B has a radius of 34 mm to 35 mm. However, the lead-out area may be provided from a radius of 34 mm to a radius of 58.5 mm. It is also possible to print a label on the condition that there is no incident light spot on the incident surface irradiated to the position of the information area +2 mm.

Embodiment 1-2 In this embodiment, the substrate 10 on the side B as shown in FIG.
D in which label 30 is printed in the same plane as the information area of b
An example of manufacturing a VD will be described. Two MPEs consisting of video software with a digital information amount of 4.6 gigabytes and attached software with 0.7 gigabytes of making video information
The G2 compressed / edited master file data is input to a laser beam recorder (LBR) via a DVD physical format encoder and recorded on a photoresist master. Radius of master for duplication of side A 22.6mm ~
58.5 mm is partitioned as a side A information area including a lead-in and lead-out area, the master file 1 is recorded in the side A information area, and a master for duplication of the side B includes a lead-in and lead-out area. Radius 22.
Recording of the master file 2 is performed with a side B information area of 6 mm to 35.0 mm.

The photoresist master on which the data (master file) of side A and side B is recorded (exposed) is developed, a conductive film is formed, and a plating process, back surface polishing, resist removal, and inner and outer diameter processing are performed. Each stamper is manufactured.

Each stamper is mounted on a mold of an injection molding machine manufactured by Meiki Seisakusho, and polycarbonate resin AD manufactured by Teijin Chemicals Ltd.
Using 5503, mold the substrate at a mold temperature of 100 to 120 ° C., a resin temperature of 320 to 380 ° C., and a cycle time of 4 to 6 seconds, and form an outer diameter of 120 mm and an inner diameter of 15 m.
A substrate having a thickness of m and a thickness of 0.6 mm is prepared.

For the substrate 10b on the side B, the radius of the surface on which information was recorded was 35.5 mm using a sputtering apparatus.
After forming the aluminum reflective film 12 to a thickness of about 50 nm, the surface is spin-coated with an ultraviolet curable resin, and the protective film 16 is formed by an ultraviolet curable treatment. Further, the label 30 is printed in an area having a radius of 35.5 mm to 59 mm. Label printing is possible even within a radius of 35.5 mm, but is invisible after bonding the substrates 10a and 10b because it is blocked by the reflective film.

Substrate 10 of each of side A and side B
a, a flash curable adhesive 16 is applied to the surface of the protective film 14 and irradiated with ultraviolet rays, and then the two substrates are bonded together.
Aging is performed for 5 to 10 minutes to cure the adhesive. In this way, the D with the label 30 attached to the position as shown in FIG.
VD is obtained. Since the label 30 is recorded in the same plane as the information area of the substrate 10b, it does not wear due to contact with a disk or the like.

Further, a radius of 35.5 mm to 59 m is used on the outer surface of the side B substrate 10b by using a screen printer.
Another title label or the like may be printed in the area of m.

Embodiment 2 In Embodiment 1, a title label was formed by using screen printing. In this embodiment, a DVD having a label formed by a pit art method of forming a pattern with prepits is used.
Will be described.

[0023] Two master file data consisting of 4.7 gigabytes of side A and 2.4 gigabytes of side B are stored in a DVD physical format encoder, with the total digital information amount after MPEG2 compression / editing being 7.1 gigabytes of video software. And input it to a laser beam recorder and record it on a photoresist master.

It is sufficient for the information on the side B to secure a recording area up to a radius of 49.5 mm including the lead-out area. Subsequently, pit art data is recorded from a radius of 49.5 to a vicinity of 60 mm.

The photoresist master recording the data of each of the side A and the side B is developed, a conductive film is formed, and a plating process, a back surface polishing, a resist removal, and an inner / outer diameter processing are performed to produce stampers.

Each stamper was attached to a mold of an injection molding machine manufactured by Meiki Seisakusho, and the mold temperature was set to 100 to 120 using a polycarbonate resin AD5503 manufactured by Teijin Chemicals.
℃, resin temperature 340-380 ° C, cycle time 4-6
Substrate molding is performed under the conditions in the range of seconds to produce substrates having an outer diameter of 120 mm, an inner diameter of 15 mm, and a thickness of 0.6 mm.

For each of the substrates constituting the sides A and B, an aluminum reflective film is formed with a thickness of about 50 nm on the surface on which information is recorded by using a sputtering apparatus, and the surface is spin-coated with an ultraviolet curable resin. A protective film is formed by ultraviolet curing. A flash-curable adhesive is applied to the surface of the protective film on each of the side A and side B substrates, and after irradiating ultraviolet rays, the two substrates are bonded together and aged for 5 to 10 minutes to cure the adhesive. Thus, in the same plane as the information area of the side B, the radius of 49.5 mm
DV with pit art label in the area of 60mm
D can be prepared. In this case, since the label can also be exposed at the time of exposing the master, the label printing operation becomes unnecessary. Further, since the label is recorded in the same plane as the information area of the substrate, the label does not wear due to contact with the disk or the like.

Embodiment 3 In Embodiments 1 and 2, a read-only DVD has been described, but the present invention is also applicable to a write-once or rewritable optical recording medium. For example, a substrate corresponding to the side A of the DVD of Example 1-1 is mounted on a write-once DVD (DVD Write Onc).
e) substrate or rewritable DVD (DVD Rewritabl)
e) A recording film, a reflective film, a protective film, and the like corresponding to the substrate are sequentially laminated. Then, the side B of Example 1-1
The information such as the system software of the recording device, the manual / catalog, or the dummy information is recorded on the substrate corresponding to
Laminate the sheets. Finally, a printable label is printed on the side B substrate. By using DVD Write Once or the like, the user can print the contents of the added or rewritten label by himself. Below, DV
This will be described in detail by taking D Rewritable as an example.

A DVD Rewritable formatter signal is input to the LBR and recorded on the photoresist master (Side A). Next, 0.7 gigabytes of manual information is transmitted to the L through a DVD physical format encoder.
Input to BR, 30mm radius on another photoresist master
(Side B).

The photoresist master recording the data of each of the side A and the side B is developed to form a conductive film, and a plating process, back surface polishing, resist removal, and inner / outer diameter processing are performed to produce a stamper. The stamper on the side A was attached to the mold of an injection molding machine manufactured by Meiki Seisakusho, and the mold temperature was 115 to 125 ° C, the resin temperature was 360 to 380 ° C, and the cycle time was 6 to 12 using Teijin's polycarbonate resin AD5503. Substrate molding is performed under the conditions in the range of seconds to produce a substrate having an outer diameter of 120 mm, an inner diameter of 15 mm, and a thickness of 0.6 mm.

On the pattern formation surface of the substrate corresponding to side A, a dielectric protective film, GeSbTe
A system phase change recording film, a dielectric protection film, and an aluminum alloy-based reflection film are sequentially laminated, and a UV-curable protection film is further formed. On the side B, a substrate is formed under the same conditions as in Example 1-1, and an aluminum reflective film and an ultraviolet-curable protective film are formed on the information surface side.

A flash-curable adhesive is applied to the protective film surfaces of the side A and side B substrates, respectively, and after irradiating with ultraviolet rays, the two substrates are laminated and aged for 5 to 10 minutes to cure the adhesive. .

Next, a printable label is printed on the side B substrate using a screen printer in an area having a radius of 36 mm to 59 mm. In the case where dummy information is recorded on the side B or the dummy substrate on which no information is recorded, there is no need to reproduce the information. Therefore, similarly to the single layer type DVD, the radius of the side B substrate on the side opposite to the light incident surface is 33 mm.
The outer side is the printable area. Further, the user can print a pattern such as a maker logo or a title under bar on an individual level according to data or the like additionally written in an area having a diameter of 36 mm to 59 mm on the side B substrate side.

The information on the side B can be reproduced by a DVD rewritable recording device supporting a DVD-ROM. With this recording device, video information can be recorded in the recording area on the side A, and notes and the like relating to the video information recorded on the printable label on the side B board can be written.

In the above embodiment, the case where video software is recorded has been described, but any information can be recorded. For example, the present invention can be applied to music software, graphics, code data, and the like whose format conforms to the DVD standard.

In the first embodiment, the title label is screen-printed. However, the present invention is not limited to this, and offset printing or the like can be used. The label is not limited to printing, and can be attached by any method.

In the optical recording medium of the present invention, even if the digital information after compression is title software of 4.7 gigabytes or less, data such as making, NG collection, soundtrack, etc. is recorded on the side B, and similarly. A title software label may be formed on the side B substrate.

[0038]

According to the optical recording medium of the present invention, when the total amount of information is smaller than the settable information area of the two substrates,
The information amount of the two substrates is given a difference, and the area outside the information recording area of the substrate with the smaller information amount is labeled with a pit art pattern or printing, so that the reproduction light is emitted from both sides of the optical recording medium. Even when the light is incident, the label does not block the reproduction light, and a sufficient area can be secured even when the recording of the warning label is required. In particular, the optical recording medium of the present invention in which a label is formed with a pit art pattern in the same plane as the information area and outside the information area has advantages that the label printing operation can be omitted and the label is hardly worn. In particular, the present invention provides an optical recording medium suitable for DVD.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a disk structure and a label position of a DVD manufactured in Example 1-1.

FIG. 2 is a flowchart illustrating an outline of a DVD manufacturing process of Example 1-1.

FIG. 3 is a partial sectional view showing a disk structure and a label position of a DVD manufactured in Example 1-2.

[Explanation of symbols]

 10a, 10b Substrate 12 Aluminum reflective layer 14 Protective layer 16 Adhesive layer 20, 30 Label

Claims (6)

[Claims] An optical recording medium in which two substrates each having an information recording area provided on one surface of a disc-shaped substrate surface are bonded with the surface having the information recording area facing inward. A label-equipped light, wherein the information recording areas of the two substrates have different recording capacities and at least a part of an outer area of the information recording area having a smaller recording capacity is labeled; recoding media. 2. The optical recording medium with a label according to claim 1, wherein the label is provided on a surface of the substrate opposite to a surface on which the information recording area is provided. 3. The optical recording medium with a label according to claim 1, wherein the label is provided on the same substrate surface as the surface on which the information recording area is provided. 4. The optical recording medium with a label according to claim 3, wherein the label is formed by a pre-pit pattern. 5. The optical recording medium with a label according to claim 1, wherein the optical recording medium is a DVD, and the label is attached to an area outside a diameter of 70 mm of the DVD. 6. An optical recording medium with a label according to claim 1, wherein the label is attached by printing, and a label printing surface is subjected to a printable process.