JP2003085912A - Optical recording medium and cartridge for optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce consumption of a resin material, the amount of dust and cost for manufacture and transportation in a manufacturing stage for an optical recording medium while keeping the compatibility with a DVD (R). SOLUTION: The optical recording medium consists of a thin disk like optical disk 4a and cartridges 1 and 5 formed in a disk shape and housing the optical disk 4a. The cartridges 1 and 5 have light transmission parts consisting of polycarbonate resin in the areas corresponding to a signal recording area of the optical disk 4a and 0.6 mm thickness from the surfaces thereof to a signal recording surface of the optical disk 4a.

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, an optical recording medium cartridge that constitutes this optical recording medium, and a recording disk that is used by being housed in the optical recording medium cartridge.

[0002]

2. Description of the Related Art Conventionally, a recording disc such as a so-called optical disc has been proposed, and as such an optical disc, a so-called "DVD (recording medium for software such as computer programs, images, music, etc., which is created by a stamper, (Registered trademark) "is proposed.

Such an optical disc has the advantage that the same one can be manufactured in a large amount in a short time and the manufacturing cost is low, but since it is manufactured and consumed in a large amount, it can be further miniaturized (thinned, It is desired to reduce the diameter and reduce the manufacturing and transportation costs.

Further, when manufactured in large quantities, since a large amount of polycarbonate resin is used as a material, a large amount of resources are consumed and at the same time a large amount of dust is generated. From such a viewpoint, in order to reduce the amount of resin material required and to reduce the manufacturing and transportation costs, an optical disk thinner than before, for example, a thickness of about 0.3 mm to 0.5 mm. Is proposed. Such optical discs are disclosed, for example, in Japanese Patent Laid-Open Nos. 6-60423, 10-308059, and 11-2.
No. 13471 gazette.

[0005]

By the way, the above-mentioned optical discs thinner than the conventional ones have been used up to now, for example, as "CD (registered trademark)" and "DVD (registered trademark)" optical discs. Not compatible. That is, a dedicated device for reproducing an information signal from such a thin optical disc is required.

[0006] In this, the "CD
Both the (registered trademark) and “DVD (registered trademark)” playback devices and the thin optical disc playback device must be used, which is complicated.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and has been used so far in "DV".
While maintaining compatibility with "D (registered trademark)", the amount of resin material used in the manufacturing process can be reduced, the amount of dust generated can be reduced, and the manufacturing and transportation costs can be reduced. An optical recording medium and a cartridge for the optical recording medium are provided.

[0008]

In order to solve the above problems, an optical recording medium according to the present invention has a disk-shaped recording disk having a signal recording layer and a disk-shaped recording disk having a hollow portion for accommodating the recording disk. And a cartridge in which the recording disc is housed in the hollow portion and at least a region corresponding to a signal recording region of the recording disc is a light transmitting portion, the light transmitting portion of the cartridge being formed of a polycarbonate resin. The thickness of the transparent layer from the surface of the light transmitting portion to the signal recording surface of the recording disk is 0.6 mm.

The optical recording medium cartridge according to the present invention is formed in a disc shape having a hollow portion for accommodating a disc-shaped recording disk having a signal recording layer, and at least the recording disc is accommodated in the hollow portion. At this time, the area corresponding to the signal recording area of the recording disk is a light transmitting portion formed of polycarbonate resin, and the area from the surface of the light transmitting portion to the signal recording surface of the recording disk housed in the hollow portion is transparent. The layer is characterized by having a thickness of 0.6 mm.

[0010]

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

As shown in FIG. 1, the optical recording medium according to the present invention comprises a recording disk 4a housed in the optical recording medium cartridge according to the present invention. Cartridge for optical recording medium (hereinafter referred to simply as "cartridge"
Is written. ) Is composed of two parts, a base 5 and a cover 1, and the recording disk 4a is sandwiched between these parts and used. The material forming the pace 5 and the cover 1 is a transparent polycarbonate resin which is the same material as the material forming the base material of the recording disk 4a.

The recording disk 4a, as shown in FIG.
It is formed in a disk shape with an outer diameter of 80 mm and has a center hole with an inner diameter of 40 mm. As shown in FIG. 3, this recording disk 4a has a light transmitting layer 9 made of a transparent polycarbonate resin, similar to a so-called "DVD-ROM" disk.
It has a structure in which a reflective film 10 made of aluminum and a protective film 11 made of an ultraviolet (UV) curable resin or the like are laminated. One surface of the light transmitting layer 9 is a flat surface on which light is incident, and the other surface is a surface on which embossed pits representing data contents are formed. A reflective film 10 and a protective film 11 are laminated and deposited on the surface where the embossed pits are formed. The shape and data format of the embossed pit is 80 mm in diameter for "DVD.
A format similar to that used for ROM.

The thickness of this recording disk 4a is 0.05.
mm to 0.3 mm, and in this embodiment, it is 0.1 mm. This recording disk 4
Since a is 0.9 mm to 1.15 mm thinner than the conventionally used “DVD-ROM” disc, the amount of polycarbonate resin used for manufacturing can be significantly reduced (about 76% to (96% reduction), material costs can be reduced, weight can be reduced to reduce transportation costs, and the amount of dust generated can be reduced.

Further, the recording disk 4a has flexibility by reducing the thickness. for that reason,
The recording disk 4a is less likely to be damaged even when the recording disk 4a is packaged in an unfavorable state, for example, when it is distributed between magazines as a magazine appendix.

The cover 1 forming the cartridge is
As shown in FIGS. 4 and 5, the outer diameter is, for example, 92 mm.
With a central hole with an inner diameter of 40 mm and a thickness of 0.3 mm
It is formed in a disk shape of 0.55 mm to 0.55 mm. In this embodiment, the cover 1 has a thickness of 0.5 mm, and the total thickness of the recording disc 4a is 0.6 mm.
I am trying to become. The thickness of the cover 1 is determined according to the thickness of the recording disk 4a. In any case, the total thickness of the cover 1 and the recording disk 4a is 0.6 m.
to be m.

A plurality of bossed hook portions 2a to 2d for engaging with the base 5 and a hook portion 3 are provided on the cover 1.
a to 3d are formed. Hook with boss 2a-2
d is formed on the outer peripheral portion of the cover 1 and includes hook portions 3a to 3a.
d is formed on the inner peripheral portion of the cover 1. The bossed hook portions 2a to 2d and the hook portions 3a to 3d are formed in a hook shape by protruding from the cover 1 to the base side, and the bossed hook portions 2a to 2d and the hook portion 3 are formed.
Even in the portion where a to 3d are formed, the total thickness of the cover 1 does not exceed 1.2 mm.

The base 5 is, as shown in FIGS. 6 and 7,
It has a central hole 8 with an outer diameter of 120 mm and an inner diameter of 15 mm, and is formed in a disk shape with a thickness of 1.2 mm. The inner diameter for fitting the cover 1 to one surface of the base 5 is
For example, a concave portion having a depth of about 92 mm and a depth of 0.6 mm is formed. The cover 1 and the recording disk 4a are fitted in the recessed portion in a stacked state. That is, in the portion corresponding to this concave portion, the total thickness is 1.2 when the base 5, the recording disk 4a and the cover 1 are laminated.
mm.

The base 5 has a plurality of bossed hook portions 2a to 2d and hook portions 3a to 3 of the cover 1.
Engagement holes 6a to 6d and 7a to 7d for engaging with d are formed on the outer peripheral side and the inner peripheral side. These engaging holes 6a-
6d and 7a to 7d are shaped to wrap around to the other surface side of the base 5, and hook-shaped bossed hook portions 2a to 2d and hook portions 3a to 3d are engaged with each other. Holes for fitting the bosses provided on the hook portions 2a to 2d are provided near the engaging holes 6a to 6d with which the hook portions 2a to 2d with bosses are engaged.

In this cartridge, the recording disk 4a is concentrically placed in the concave portion of the pace 5 with the protective film 11 on the base 5 side using the center hole as a reference for alignment. The cover 1 is placed on the base 5, and the cover 1 is engaged with the base 5 to be stored in the cartridge.

As shown in FIG. 8, the cover 1 is placed on the base 5 in such a manner that the hook portions 2a to 2d with bosses are aligned so that the hook holes 2a to 2d of the base 5 fit into the cutout holes beside the engaging holes 6a to 6d. Then, as shown in FIG. 9, the bosses of the hook portions 2a to 2d with bosses are fitted in the holes in the vicinity of the engaging holes 6a to 6d and locked by rotating in one direction. At this time, the hook portions 3a to 3d of the cover 1 are engaged with the engaging holes 7a to 7d of the pace 5.
After passing through d, the other side of the pace 5 is engaged.

The recording disk 4a is stored in the cartridge as described above, and the conventional "DVD-RO" is used.
It can be used (reproduced) in the same state as "M".

On the contrary, the cover 1 is rotated in the other direction with the bosses of the hook portions 2a to 2d with bosses pushed into the other surface side of the base 5 so as to be removed from the holes in the vicinity of the engaging holes 6a to 6d. Then, the cover 1 can be removed from the base 5, and the recording disk 4a can be taken out. In this cartridge, the recording disk 4a can be replaced any number of times in this manner.

Next, the reason why the recording disk 4a in the optical recording medium according to the present invention can be reproduced by using a device similar to the conventional "DVD-ROM" will be described. As shown in FIG. 10, the conventional “DVD-ROM” has a protective film 1 of an ultraviolet (UV) curable resin on a disc substrate 16.
5. The structure is such that the aluminum reflection film 14 (signal recording surface) and the light transmission layer 13 made of polycarbonate resin are laminated, and the thickness of the disk substrate 16 and the light transmission layer 13 is 0.6 mm, respectively. ing. Therefore,
The "DVD-ROM" is configured as a 1.2 m-thick laminated disk as a whole. This "DVD
The optical system for reproducing the information signal from the "-ROM" is designed to read the information signal on the reflection film 14 through the light transmission layer 13 having a thickness of 0.6 mm.

The optical recording medium according to the present invention, as shown in FIG. 11, has a base 5, a protective film 11 and a reflective film 1.
0, the light transmission layer 9 and the cover 1 are laminated. In order to read an information signal from this optical recording medium by the same optical system as the optical system for "DVD-ROM", the thickness of the transparent layer composed of the cover 1 and the light transmitting layer 9 is
It must be 0.6 mm as in "DVD-ROM". In this optical recording medium, as shown in FIG. 11, the light beam focused by the objective lens 12 of the optical pickup device passes through the cover 1, the light transmitting layer 9 of the recording disk 4a, and the reflecting film 10. Focus on the embossed pit. The thickness of the portion of the cover 1 through which the light flux passes is 0.5 m
m, which is 0.6 mm when combined with the thickness of the light transmission layer 9 of the recording disk 4a of 0.1 mm. This is "DV
It has the same thickness as the light transmission layer 13 of the "D-ROM" disc. The material of the cover 1 is also the light transmission layer 9 of the recording disk 4a.
Since it is the same transparent polycarbonate resin as the above, the optical condition is the same as that of the light transmitting layer 9 of the "DVD-ROM" disk, and the information signal can be read by the optical system for "DVD-ROM". .

The base 5 corresponds to the disk base material 16 of the "DVD-ROM" disk. Since the thickness of the portion of the base 5 on which the recording disk 4a is placed is 0.6 mm, the total thickness from the cover 1 to the base 5 is 1.2 mm. This is a "DVD-ROM"
It is the same as the total thickness of the disc.

Further, as shown in FIGS. 12 and 13,
The optical recording medium in which the recording disk 4a is housed in the cartridge has an outer diameter of 1 like the "DVD-ROM" disk.
20 mm, the inner diameter of the central hole is 15 mm, and the external shape is "D-ROM" in the reproducing device for "DVD-ROM".
VD-ROM "can be handled in the same manner. Further, this optical recording medium is within the standard of the "DVD-ROM" disk in terms of the weight, inertia, and weight balance as a whole. The shape of the embossed pits on the reflective film 10 of the recording disk 4a and the data format are "DVD-ROM" having an outer diameter of 80 mm.
Since it is the same as the disk, the read data can be processed in the same manner as in the case of the "DVD-ROM".

In this optical recording medium, if the user prepares at least one cartridge, a plurality of recording disks 4a can be provided for this cartridge.
Can be exchanged and stored, and each recording disk 4a can be reproduced by using a reproducing device for "DVD-ROM". That is, in this optical recording medium, it is possible to significantly reduce the amount of resin material used as a material while ensuring compatibility with the conventional "DVD-ROM" disk.

Here, if the thickness of the "DVD-ROM" disk is simply reduced to 0.05 mm to 0.3 mm, the disk is bent due to its own weight and warpage is likely to occur. However, even if it is chucked, it is not possible to maintain the flatness enough to read the information signal with the optical pickup device. However, in the optical recording medium according to the present invention, when the recording disk 4a is housed in the cartridge and used, the recording disk 4a is thin enough to be bent by its own weight, and even if warping occurs. The information signal can be read.

Although the recording disk 4a has a thickness of 0.1 mm and the cover 1 has a thickness of 0.5 mm in the above-described embodiment, the optical recording medium and the cartridge according to the present invention have these thicknesses. The numerical value is not limited to a numerical value, and the total thickness of the cover 1 and the light transmission layer 9 of the recording disk 4a may be 0.6 mm.

In the above-mentioned embodiment, the recording disk 4a is compatible with "DVD-ROM", but in this optical recording medium, the recording disk is a so-called "DVD-R" disk. Or "DVD
It may be compatible with "-RW" discs.
In this case, as shown in FIG. 14, the recording disk 17 is formed into a disk shape having an outer diameter of 80 mm and a center hole of an inner diameter of 40 mm, and as shown in FIG. 15, a light transmitting layer 18 of polycarbonate resin. A recording film 19, a reflective film 20, and a protective film 21 made of an ultraviolet (UV) curable resin.
Are laminated and configured.

To maintain compatibility with the "DVD-R" disc, a dye-based recording film is used as the recording film 19 and gold is used as the reflective film 20. In addition, "DVD-
To maintain compatibility with the “RW” disc, a layer-change recording film is used as the recording film 19 and aluminum is used as the reflective film 20. When maintaining compatibility with these "DVD-R" discs and "DVD-RW" discs, data is provided on one side of the light transmitting layer 9 when maintaining compatibility with "DVD-ROM" discs. Unlike the presence of the embossed pit in which is recorded, such an embossed pit does not exist, and one surface of the light transmission layer 9 has
Grooves called groups are formed. The shape of this groove and the format of the data have an outer diameter of 80 mm.
This is in conformity with the standard of "DVD-R" disc and "DVD-RW" disc.

Since these optical recording media are similar to the "DVD-R" disc and the "DVD-RW" disc in outer shape and the like, they are a reproducing apparatus for the "DVD-R" disc and a "DVD-RW" disc, respectively. An information signal can be reproduced by using a reproducing device for a disc.

Furthermore, as shown in FIG. 16, the optical recording medium according to the present invention has a recording disk 4 having an outer diameter of 120 mm.
You may comprise using b. In this case, the cartridge is composed of two parts, the base 5 and the cover 1,
The storage of the recording disk 4b between them is the same as in the above-described embodiment. Pace 5
The material forming the cover 1 and the cover 1 is the same as the material forming the base material of the recording disk 4b.
lycarbonate) resin.

The recording disk 4b is formed in a disk shape having an outer diameter of 120 mm and has a center hole having an inner diameter of 40 mm.
This recording disk 4b is a so-called "DVD-ROM".
Disc, "DVD-R" disc, or "DVD
The optical transmission layer has a thickness similar to that of the "-RW" disk, but has a thickness of 0.05 mm to 0.3 mm. The recorded data format is a diameter of 120 mm
"DVD-ROM", "DVD-R", or "D"
It is similar to the format used for "VD-RW".

The cover 1 forming the cartridge is
It has a central hole with an outer diameter of 120 mm and an inner diameter of 40 mm, and is formed in a disk shape with a thickness of 0.3 mm to 0.55 mm, and has a thickness of 0.6 mm together with the thickness of the recording disk 4b.

A plurality of hook portions 3a to 3d for engaging with the base 5 are formed on the inner peripheral portion of the cover 1. These hook portions 3a to 3d are formed in a hook shape by protruding from the cover 1 to the base side, but the total thickness of the cover 1 is 1.2 mm even in the portion where these hook portions 3a to 3d are formed. It is designed not to exceed.

The base 5 has an outer diameter of 120 mm and an inner diameter of 15
It has a central hole of mm and is formed in a disk shape having a thickness of 0.6 mm. That is, when the base 5, the recording disk 4b and the cover 1 are laminated, the total thickness is 1.2 mm.

The base 5 is provided with engagement holes 7a to 7d for engaging the plurality of hook portions 3a to 3d of the cover 1.
7d is formed on the inner peripheral side. These engagement holes 7a-7
d has a shape that wraps around the other surface of the base 5,
The hook-shaped hook portions 3a to 3d are engaged with each other.

In this cartridge, the recording disk 4b is placed concentrically on the pace 5 with the protective film on the base 5 side, using the center hole as a reference for alignment, and the cover 1 Cover this cover 1
By being engaged with the base 5, the cartridge is sandwiched and stored in this cartridge. The cover 1 has hook portions 3a to 3
It is engaged with the base 5 by passing d through the engaging holes 7a to 7d of the pace 5 and engaging with the other surface side of the pace 5.

The recording disk 4b, thus housed in the cartridge, is a conventional "DVD-ROM".
It can be used (reproduced) in the same state as "DVD-R" or "DVD-RW". Then, in this optical recording medium, the cover can be removed from the base 5 to replace the recording disk 4b.

[0041]

As described above, in the optical recording medium and the optical recording medium cartridge according to the present invention, the disc-shaped recording disk having the signal recording layer is formed in the disc-shaped optical recording medium cartridge. It is used by storing it in the hollow part of. In this optical recording medium cartridge, at least an area corresponding to the signal recording area of the recording disk is a light transmitting portion formed of polycarbonate resin, and the thickness of the transparent layer from the surface to the signal recording surface of the recording disk is It is 0.6 mm.

Since the recording disk housed in the optical recording medium cartridge can be made thinner than the conventional "DVD (registered trademark)" disk, compatibility with this "DVD (registered trademark)" is maintained. At the same time, the amount of the polycarbonate resin used as a material can be significantly reduced, which can save resources and reduce the amount of dust generated.

Since the recording disk is thin, it has flexibility and is not easily damaged. When this recording disk is used, the recording disk is sandwiched by the cartridges for the optical recording medium so as to have a flat shape, so that the flatness allowable range required at the time of manufacture is wide.

That is, the present invention maintains compatibility with the "DVD (registered trademark)" used so far,
It is possible to provide an optical recording medium and a cartridge for an optical recording medium that can reduce the amount of resin material used in the manufacturing process, reduce the amount of dust generated, and reduce the manufacturing and transportation costs. It is a thing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing configurations of an optical recording medium and an optical recording medium cartridge according to the present invention.

FIG. 2 is a plan view showing a configuration of the optical recording medium.

FIG. 3 is a vertical cross-sectional view showing the structure of the optical recording medium.

FIG. 4 is a plan view showing a configuration of a cover of the optical recording medium cartridge.

FIG. 5 is a side view showing a configuration of a cover of the optical recording medium cartridge.

FIG. 6 is a plan view showing a configuration of a base of the optical recording medium cartridge.

FIG. 7 is a side view showing a configuration of a base of the optical recording medium cartridge.

FIG. 8 is a plan view showing a state in which the cover of the optical recording medium cartridge is attached to the base.

FIG. 9 is a plan view showing a state in which the cover of the optical recording medium cartridge is attached to the base.

FIG. 10 is a vertical cross-sectional view showing a state of reproducing a “DVD-ROM” disc.

FIG. 11 is a vertical cross-sectional view showing a state in which reproduction is performed on the optical recording medium according to the present invention.

FIG. 12 is a plan view showing the configuration of the optical recording medium.

FIG. 13 is a side view showing the configuration of the optical recording medium.

FIG. 14 is a plan view showing another example of the recording disk constituting the optical recording medium according to the present invention.

15 is a vertical cross-sectional view showing the structure of the recording disk shown in FIG.

FIG. 16 is an exploded perspective view showing another example of the configuration of the optical recording medium according to the present invention.

[Explanation of symbols]

1 cover, 4a, 4b recording disc, 5 base

Claims (14)

[Claims] 1. A disc-shaped recording disc having a signal recording layer, and a disc-shaped disc having a hollow portion for accommodating the recording disc, wherein the recording disc is accommodated in the hollow portion and at least a signal of the recording disc. A cartridge in which a region corresponding to the recording region is formed as a light transmitting part, wherein the light transmitting part of the cartridge is formed of polycarbonate resin, and a transparent layer from the surface of the light transmitting part to the signal recording surface of the recording disk The optical recording medium has a thickness of 0.6 mm. 2. The recording disc is formed by depositing a signal recording layer on a transparent disc substrate, and the thickness of the disc substrate is 0.05 mm to 0.3 mm. 1. The optical recording medium according to 1. 3. The optical recording medium according to claim 1, wherein the recording disk is replaceable. 4. The diameter of the cartridge is 120 mm ±
The optical recording medium according to claim 1, wherein the optical recording medium has a thickness of 0.3 mm. 5. The optical recording medium according to claim 4, wherein the diameter of the recording disk is 80 mm. 6. The optical recording medium according to claim 4, wherein the diameter of the recording disk is 120 mm. 7. The thickness of the cartridge is 1.185 mm
± 0.045 mm and the total weight is 13 g to 2
The optical recording medium according to claim 4, wherein 0 g, the total inertia is 0.04 gm ² or less, and the total dynamic balance is 0.01 gm or less. 8. A disc-shaped recording medium having a hollow portion for accommodating a disc-shaped recording disc having a signal recording layer, and at least a signal recording area of the recording disc when the recording disc is accommodated in the hollow portion. The corresponding area is a light transmitting part made of polycarbonate resin, and the thickness of the transparent layer from the surface of this light transmitting part to the signal recording surface of the recording disk housed in the hollow part is 0.6 mm. A cartridge for an optical recording medium, which is characterized by: 9. The hollow portion accommodates a recording disc formed by depositing a signal recording layer on a transparent disc substrate having a thickness of 0.05 mm to 0.3 mm. A cartridge for an optical recording medium as described above. 10. A cartridge for an optical recording medium according to claim 8, wherein the recording disk housed in the hollow portion is replaceable. 11. The cartridge for an optical recording medium according to claim 8, wherein the diameter is 120 mm ± 0.3 mm. 12. A cartridge for an optical recording medium according to claim 11, wherein a recording disk having a diameter of 80 mm is housed in the hollow portion. 13. The cartridge for an optical recording medium according to claim 11, wherein a recording disk having a diameter of 120 mm is housed in the hollow portion. 14. The thickness is 1.185 mm ± 0.045.
mm, the total weight when the recording disk is stored is 13 to 20 g, and the total inertia is 0.04 gm ^2.
12. The optical recording medium cartridge according to claim 11, wherein the total dynamic balance is 0.01 gm or less.