JPH07117384A - Cardlike information recording medium - Google Patents

Abstract

PURPOSE:To reduce warpage, deformation due to variations in a temperature, a humidity, a density by providing a layer having high rigidity in a long side direction of a cardlike information recording medium for recording/reproducing information. CONSTITUTION:A layer 14 having high rigidity only in a long side direction of a cardlike information recording medium is provided in the medium for recording/reproducing information. For example, glass fibers are aligned in a sheetlike state in parallel as a rear board, and a vinyl chloride sheet is press injected thereto, thereby manufacturing a rigid sheet 14. A 0.4mm PMMA transparent resin board 11 having an optically recording layer 12 is adhered to the board through an adhesive layer 13 in such a manner that a long side of a card is parallel to a fiber direction, and punched in a size of a card to obtain a cardlike optically recording medium. That is, since it can be reversibly deformed against an impact from an exterior during carrying, an irreversible deformation, a crack, peeling, etc., scarcely occur. Since rigidity of a long side direction of a recording/reproducing direction is high, stable recording/ reproducing can be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card-shaped information recording medium for recording / reproducing information.

[0002]

2. Description of the Related Art Conventionally, prepaid cards, IC cards, magnetic cards, optical cards and the like are known as card-shaped information recording media for recording and reproducing information.

[0003]

Most of these information recording media are formed by laminating resin sheets of different materials. In the card-shaped recording medium, the flatness in the recording direction of the card information is more important than the recording / reproducing method. However, due to the difference in characteristics of each material, the card often warps due to changes in environment such as temperature and humidity.

A method of laminating layers having high rigidity has also been devised for the purpose of preventing the warp. However, if the layer is too rigid and loses flexibility, it cannot withstand external shock and is irreversible. There were problems such as deformation, cracking, and easy peeling.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, and its gist is to provide a card-shaped information recording medium for recording and reproducing information, in which the rigidity is increased only in the long side direction of the information recording medium. The information recording medium is characterized in that a high layer is provided.

[0006]

According to the present invention, by increasing the rigidity only in the long side direction of the card, a card-shaped recording medium which can be reversibly deformed by an external impact and does not warp in the long side direction is made possible. It is a thing.

The present invention will be described in more detail below.

The rigid layer may be laminated on any layer of the card-shaped recording medium, may be used as a backing material, or may be laminated as an intermediate layer.

When laminating, the rigid layers are laminated so that the direction of high rigidity is parallel to the long side of the card of the card-shaped recording medium.

At the time of stacking, cards each of which has a size of card size may be stacked, or after stacking, the card size may be punched or cut by laser cutting or the like. The rigid layer may have any rigidity as long as the rigidity is high in one direction. Specifically, the sheet may be formed by arranging fiber-shaped or pipe-shaped ones in a parallel / substantially parallel manner. The material forming the fiber may be glass or resin such as vinyl chloride. The sheet can be formed by a method in which fibers are arranged and pressed onto a sheet, a method in which resin is arranged in a mold or the like and a resin is injected and cured, or a method in which fibers are arranged in a sheet and heated and pressed when the resin is a resin.

[0011]

EXAMPLES Examples of the present invention will be described below.

Example 1 As a back substrate, glass fibers were arranged in parallel in a sheet form and a vinyl chloride sheet was pressure-bonded thereto to produce a rigid sheet 14.

0.4 mm PMMA provided with an optical recording layer 12 such that the long side of the card is parallel to the fiber direction.
The transparent resin substrate 11 was bonded to the back substrate 16 via the adhesive layer 13, punched into a card size, and cut to obtain a card-shaped optical recording medium as shown in FIG.

Example 2 Using the same rigid sheet 14 as in Example 1, the vinyl chloride substrate 1
5 and the back substrate 16 having the magnetic recording layer embedded therein were bonded together with an adhesive to obtain a card-shaped recording medium as shown in FIG.

Comparative Example 1 A 0.4 mm PMMA transparent substrate provided with an optical recording layer was bonded to a 0.3 mm PVC substrate via an adhesive. (Measurement of Warpage) The samples of the respective examples were treated at 60 ° C. and 90% RH.
After being left in the environment for 500 hours, the warpage of each card in the short side direction and the long side direction was measured.

The measurement was carried out by measuring the distance to the apex of the warp (including the card thickness) when the corner of the measurement side was in contact with the reference plane.
The results are shown in Table 1.

[0017]

[Table 1] It can be seen that Examples 1 and 2 have extremely less warpage than Comparative Example 1 on both the short side and the long side. (Recording / reproducing test) Recording / reproducing was performed on each of the example samples according to each method. In Examples 1 and 2, recording / reproduction was possible without change before and after the environmental change. Comparative Example 1 is
The warpage was large, and when applied to a recording / reproducing device, the auto-tracking was misaligned and recording / reproducing became impossible.

[0018]

As described above, the present invention has the following effects by increasing the rigidity only in the long side direction of the card.

(1) Since it can be reversibly deformed by an external shock while being carried, irreversible deformation, cracks, peeling, etc. are unlikely to occur.

(2) Since the rigidity in the long side direction, which is the recording / reproducing direction, is high and no warpage occurs, stable recording / reproducing is possible.

(3) Stable loading is possible.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a card-shaped recording medium and FIG.
a cross section

FIG. 2 is a plan view showing another example of a card-shaped recording medium and FIG.
-B Transverse view

[Explanation of symbols]

 1 Card Recording Layer 11 Transparent Substrate 12 Optical Recording Layer 13 Adhesive Layer 14 Rigid Layer 15 Front Substrate 16 Back Substrate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G11B 7/24 571 G 7215-5D

Claims (1)

[Claims] 1. A card-shaped information recording medium for recording and reproducing information, wherein a layer having high rigidity is provided only in a long side direction of the information recording medium.