JP2950385B2 - Information recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as an optical disk and an optical card for optically recording and reproducing information.

[0002]

2. Description of the Related Art Conventionally, in a medium such as an optical information recording medium, for example, an optical card, a preformat of a substrate provided with a preformat such as a guide groove for tracking by a fine uneven pattern and an address information pit. An optical recording layer (hereinafter, referred to as a recording layer) is provided on the surface by coating or vacuum deposition, and the recording layer surface is laminated with a protective member.

[0003]

Generally, the recording capacity of an information recording medium is uniquely determined by the area of a recording layer.
The amount is independent of the size of the recording medium. That is, depending on how the information recording medium is used, various recording capacities are combined with the design and configuration of the medium. For example, when the information recording medium is a wallet-sized card such as a cash card or a bank card, the size is 85 × 54 m.
m, the storage capacity is the size of the area of the recording layer provided on the card, that is, the area, which is a combination with another information medium such as a magnetic stripe or emboss,
Alternatively, the printed design of the card itself is considered as a transmission medium of visible information, so that it is determined in relation to the design.

As described above, the storage capacity of an information recording medium differs depending on the purpose of the information recording medium. Therefore, each time these information recording media are manufactured, auto-tracking of a recording area according to the storage capacity (hereinafter, referred to as “auto-tracking”) is performed.
It is necessary to form a pregroove for recording (AT) on a substrate and provide a recording layer thereon.

[0005] However, forming AT pregrooves of various sizes corresponding to each of them, as described above,
The creation of the information recording medium cannot be started unless the specifications of the information recording medium, especially the layout of the storage area including the storage capacity, are determined. In particular, in order to manufacture a substrate having an AT pre-groove, it is necessary to manufacture a stamper for transferring the AT pre-groove, and this process is expensive because precision and defect requirements are severe (poor yield). It takes a long time (long tact). There is a disadvantage that.
Therefore, this necessarily results in an increase in the cost of the information recording medium and an excessive delivery time.

The present invention has been made in order to improve such disadvantages of the prior art, and has as its object to easily provide an information recording medium having an arbitrary storage capacity at low cost.

[0007]

That is, the present invention relates to an information recording medium having a substrate , an optical recording layer, an adhesive layer, and a protective member in this order , wherein the substrate has one surface. A pregroove on the entire surface, and the optical recording layer is disposed on a part of the substrate surface, and the optical recording layer on the substrate surface is not disposed
In the area, the adhesive layer is in direct contact with the substrate surface, and
The information recording medium is characterized in that the adhesive layer has a refractive index equal to that of the substrate . In addition, the present invention provides a substrate,
Information recording media with recording layers and protective members in this order
The substrate has a pre-groove on one entire surface.
And the optical recording layer is disposed on a part of the substrate surface.
In an area of the substrate surface where the optical recording layer is not arranged
The protection member directly contacts the substrate surface and the protection member
Is information having a refractive index equal to that of the substrate.
It is a recording medium. The present invention also provides a substrate and an optical recording layer.
In the information recording medium to be provided, the substrate is provided on one entire surface.
The optical recording layer has a pre-groove on the surface of the substrate.
The optical recording layer on the surface of the substrate is disposed on a part thereof.
Pregrooves in areas other than the
The feature is that it is configured so that it can not be separated
This is an information recording medium.

According to the present invention, a substrate of an information recording medium having an AT pre-groove in the entire area is used, and a recording layer is formed only in a part of the pre-groove corresponding to a required storage capacity. Is provided, a low-cost information recording medium having an arbitrary storage capacity and which can be manufactured in a short period of time can be obtained. Also, for all areas AT
The area where the recording layer of the substrate having the pregroove is arranged
In a region other than the region, a barrier having the same refractive index as the substrate
Protecting member or adhesive layer directly on the substrate surface
In the area other than the area where the recording layer is located
Existing pregroove is made of a material with the same refractive index as the substrate.
The pre-groove will be filled
Information that cannot be determined from the
An information recording medium can be obtained.

[0009]

The present invention will be described more specifically with reference to the following examples. Embodiment 1 FIG. 1 is an explanatory diagram showing one embodiment of the information recording medium of the present invention. In FIG. 1, reference numeral 1 denotes a substrate of an information recording medium, on which a recording layer 2 is provided. Recording of information on the substrate 1
An AT pre-groove for reproduction is provided. In the information recording medium 5 of the present embodiment, an AT pre-groove 6 is formed in the entire area of the substrate 1, a recording layer 2 is provided on a part of the pre-groove, and a protective layer is provided thereon via an adhesive layer 3. It is formed by laminating the members 4.

The pregroove for AT is formed by transferring irregularities on the surface of a stamper or a mold by an injection molding method, a 2P method, a compression molding method, a casting molding method, or the like. According to the present invention, an AT pre-groove is formed on the entire surface of the substrate regardless of the storage / recording / reproducing area (capacity).

In FIG. 1, reference numeral 2 denotes a recording layer. The recording layer is an optical recording medium that performs optical recording and reproduction, for example, an organic medium such as a dye or pigment having absorption in a semiconductor laser or the like,
And low melting point metals and inorganic media such as chalcogen. The former is mainly performed by a dry process such as wet coating or thermal transfer, which is applied by dissolving in a solvent.
It is provided on a substrate on which an AT pre-groove is formed by dry coating such as vacuum film formation such as sputtering or sputtering.
At this time, the area (area) where the recording layer 2 is provided is determined by the storage capacity required for the information recording medium and the configuration of a combination with another recording medium such as a magnetic stripe or emboss, and as shown in FIG. The recording layer 2 is provided on a part of the AT pregroove formed on the entire surface of the recording layer.

FIG. 2 is an explanatory view showing an example of a conventional information recording medium. In FIG. 2, a recording layer 2 is provided on an AT pre-groove formed on a part of a substrate. The features of the present invention are clearer than those of FIG.

The recording layer 2 provided on a part of the AT pregroove is laminated with a protective member 4 via an adhesive layer 3. The adhesive layer 3 improves the adhesion of the protective member 4 when the protective member 4 is laminated on the substrate 1 and the recording layer 2. If the adhesiveness between the recording layer and the protective member is sufficient, the adhesive layer 3 is not necessarily required. The existence of is not necessary. The adhesive layer 3 must not react with the recording layer 2 and reduce the reflectance and sensitivity.

The adhesive layer 3 comes into direct contact with the AT pre-groove surface of the substrate in a portion where the recording layer 2 is not provided. In this case, the interface does not contain air and the refractive index between the adhesive layer and the substrate is not increased. Are adjusted equally, the AT pregroove cannot be distinguished from the appearance. That is, the presence of the AT pregroove does not hinder the logo mark and other design effects.

The protection member 4 protects the recording portion of the information recording medium 5, that is, the recording layer 3 and the AT pre-groove. Further, since the substrate side is the recording / reproducing direction of the information recording medium, the protection member 4 is a medium surface of visible information including the design. When the protective member has adhesiveness to the recording layer or the substrate, the adhesive layer can be omitted. At this time, it is preferable that the refractive index of the protective member is equal to that of the substrate having the AT pre-groove for the above-described reason.

The information recording medium according to the present embodiment having the above-described structure uses an AT pre-groove in the whole area of the substrate, and a part of the pre-groove has an area corresponding to a desired storage capacity. Since the recording layer is provided only on the substrate, it is possible to have an arbitrary storage capacity and to manufacture the device in a short period of time and at low cost.

Embodiment 2 FIG. 3 is an explanatory view showing another embodiment of the information recording medium of the present invention. In FIG. 3, reference numeral 7 denotes a magnetic stripe. As shown in the figure, when used in combination with a magnetic stripe, the recording area is limited by itself.
In the case of having a pre-groove for use, it is possible to cope with it at any time.

[0018]

As described above, according to the information recording medium of the present invention, the pregroove for AT is provided on the entire surface of the substrate,
By forming a recording layer on any part of the pre-groove, an information recording medium with an arbitrary storage capacity can be easily created. Therefore, effects such as low cost can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of an information recording medium of the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional information recording medium.

FIG. 3 is an explanatory view showing another embodiment of the information recording medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Recording layer 3 Adhesive layer 4 Protective member 5 Information recording medium 6 Pre-groove for AT 7 Magnetic stripe

Claims (3)

(57) [Claims] 1. A substrate , an optical recording layer, an adhesive layer and a protective member
At a recording medium comprising in this order, the substrate has a pregroove on one entire surface, and the optical recording layer is disposed on a portion of the substrate surface, the optical recording layer of the substrate surface But
In the non-arranged area, the adhesive layer is applied to the surface of the substrate.
Direct contact and the adhesive layer has a refractive index equal to the substrate
An information recording medium characterized in that: 2. The substrate, the optical recording layer and the protective member are arranged in this order.
In the information recording medium provided with, the substrate has one surface
A pregroove on the entire surface, and the optical recording layer is
The optical recording layer on the surface of the substrate.
In the unremoved area, the protective member is directly attached to the substrate surface.
Contact and the protection member has the same refractive index as the substrate
An information recording medium characterized in that: 3. An information recording medium comprising a substrate and an optical recording layer.
In the body, the substrate has a pre-groove on one entire surface.
And the optical recording layer is disposed on a part of the substrate surface.
Area other than the area where the optical recording layer is arranged on the substrate surface
Pregroove cannot be distinguished from the appearance
An information recording medium characterized in that the information recording medium is configured as follows.