JPH04247340A - Information recording medium - Google Patents

Abstract

PURPOSE:To easily provide the information recording medium of an arbitrary memory capacity at a low cost by providing a recording layer only in the region meeting a desired storage capacity. CONSTITUTION:This information recording medium 5 is constituted by forming pregrooves 6 for auto tracking in the entire region of a substrate 1, providing the recording layer 2 in a part on these pregrooves 6 and laminating a protective member 4 via an adhesive layer 3 thereon.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to information recording media such as optical discs and optical cards that optically record and reproduce information.

0002

2. Description of the Related Art Conventionally, in optical information recording media, such as optical cards, a substrate is preformatted with preformats such as tracking guide grooves and address information pits formed by fine concavo-convex patterns. It is constructed by providing an optical recording layer on the surface by coating or vacuum film formation, and laminating the surface of the optical recording layer with a protective member.

0003

[Problems to be Solved by the Invention] Generally, the recording capacity of an information recording medium is uniquely determined by the area of the recording layer.
The amount is independent of the size of the recording medium. That is, various recording capacities and media designs and configurations are combined depending on how the information recording medium is used. For example, if the information recording medium is a wallet-sized card such as a cash card or bank card, its size is 85 x 54 m.
The storage capacity is determined by the size of the area of the recording layer provided on the card, that is, the area.
Alternatively, since the printed design of the card itself is considered to be a medium for transmitting visual information, it is determined in relation to that design.

[0004] As described above, the storage capacity of information recording media differs depending on the purpose of each information recording medium. Therefore, when producing these information recording media, automatic tracking (hereinafter referred to as
It is necessary to form a pre-groove (denoted as AT) on a substrate and provide a recording layer thereon.

However, forming AT pregrooves of various sizes corresponding to each of them in this way is difficult.
■It is not possible to start creating an information recording medium until the specifications of the information recording medium, especially the arrangement of the storage area including the storage capacity, are determined. ■In particular, in order to make a substrate with a pre-groove for AT, it is necessary to make a stamper to transfer the pre-groove for AT, and this process is expensive as it has strict requirements for accuracy and defect control (low yield). It also takes a long time (long takt time). It has the following drawback. Therefore, this inevitably results in (1) an increase in the cost of information recording media, and (2) excessive delivery times.

The present invention has been made to improve the drawbacks of the prior art, and aims to provide an information recording medium of any storage capacity easily and at low cost.

[0007]

[Means for Solving the Problems] That is, the present invention provides an information recording medium for optically recording and reproducing information.
This information recording medium is characterized in that it has a recording layer on a part of the pregroove of a substrate having a pregroove for AT.

According to the present invention, a substrate of an information recording medium having an AT pregroove in the entire area is used, and a recording layer is formed only in a part of the area on the pregroove corresponding to the required storage capacity. By providing this, it is possible to obtain a low-cost information recording medium that has an arbitrary storage capacity and can be manufactured in a short period of time.

[0009]

[Examples] The present invention will be explained in more detail below with reference to Examples. Embodiment 1 FIG. 1 is an explanatory diagram showing an embodiment of an 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. The board 1 records information.
An AT pre-groove is provided for playback. In the information recording medium 5 of this embodiment, an AT pregroove 6 is formed in the entire area of the substrate 1, a recording layer 2 is provided on a part of the pregroove, and an adhesive layer 3 is provided on the recording layer 2 for protection. It is made by laminating the members 4.

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

In FIG. 1, numeral 2 represents a recording layer. The recording layer is an optical recording medium that performs optical recording and reproduction, for example, organic media such as dyes and pigments that absorb semiconductor lasers, etc.
It consists of a low melting point metal, an inorganic medium such as chalcogen, etc. The former is mainly applied by dry processes such as wet coating or thermal transfer, which is applied by dissolving in a solvent, and the latter is EB.
The AT pregroove is provided on a substrate formed with an AT pregroove by dry coating such as vacuum film formation using sputtering or sputtering. At this time, the area (area) in which the recording layer 2 is provided is determined depending on the storage capacity required for the information recording medium and the configuration of the combination with other recording media such as magnetic stripes and embossing. A recording layer 2 is provided in a part of the AT pregroove formed on the entire surface.

FIG. 2 is an explanatory diagram showing an example of a conventional information recording medium. In the figure, a recording layer 2 is provided in an AT pregroove formed in a part of a substrate. The characteristics of the present invention are clear when compared with 2.

A protective member 4 is laminated to the recording layer 2 installed in a part of the AT pregroove with an adhesive layer 3 interposed therebetween. The adhesive layer 3 improves the adhesion 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. existence is not necessary. The adhesive layer 3 must not react with the recording layer 2 to reduce reflectance or sensitivity.

Furthermore, the adhesive layer 3 comes into direct contact with the AT pregroove surface of the substrate in the area where the recording layer 2 is not present, but in this case, this interface does not contain air and the refractive index between the adhesive layer and the substrate is If they are adjusted equally, the AT pregroove cannot be distinguished from its appearance. That is, the presence of the AT pregroove does not interfere with the logo mark or other design effects.

The protective member 4 is for protecting the recording portion of the information recording medium 5, that is, the recording layer 3 and the AT pregroove. Further, since the substrate side is in the recording/reproducing direction of the information recording medium, the protective member 4 becomes the medium surface of the visible information including the design. If the protective member has adhesive properties with 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 and the substrate having the AT pregroove be the same for the reasons mentioned above.

The information recording medium of this embodiment having the above structure has an AT pregroove in the entire area of the substrate, and a part of the area on the pregroove corresponds to the desired storage capacity. Since the recording layer is provided only on the disk, it has an arbitrary storage capacity and can be manufactured in a short period of time and at low cost.

Embodiment 2 FIG. 3 is an explanatory diagram showing another embodiment of the information recording medium of the present invention. In FIG. 3, 7 indicates a magnetic stripe. As shown in the figure, when used in combination with a magnetic stripe, the recording area is naturally limited, but as in the present invention, the entire area is covered with AT.
If it has a pre-groove for use, it becomes possible to respond at any time.

[0018]

[Effects of the Invention] As explained above, according to the information recording medium of the present invention, the AT pregroove is provided on the entire surface of the substrate,
By forming a recording layer on any part of the pre-groove, it is possible to easily create an information recording medium with any storage capacity. Since only one type is required, effects such as low cost can be obtained.

[Brief explanation of the drawing]

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

[Explanation of symbols]

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

Claims (1)

[Claims] 1. An information recording medium for optically recording and reproducing information, characterized by having a recording layer on a part of the pregroove of a substrate having a pregroove for auto-tracking. Medium.