JP3201799B2 - Recording medium having thermal recording print layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium such as a magnetic recording card capable of performing thermal recording printing or discharge breakdown printing for the purpose of displaying a balance or preventing forgery.

[0002]

2. Description of the Related Art Conventionally, in a card-shaped recording medium such as various shopping cards and coupons, a heat-sensitive destruction recording layer or a heat-sensitive destruction recording layer is formed on the surface of a substrate in order to prevent forgery of the recording medium or to record information such as a balance display. It has been practiced to provide a discharge breakdown recording layer. The heat-sensitive destruction recording layer is formed by vapor deposition of a metal such as Sn, and the discharge destruction recording layer is formed by vapor deposition of a metal such as Al. These layers are destroyed by heat or discharge to form a tint block. In general, the substrate is formed by forming a magnetic layer for magnetic recording on a non-magnetic substrate such as a polyester film.

Further, for the purpose of preventing forgery, a tint block is formed on the surface of a recording medium. The copy-forgery-inhibited pattern is generally formed by printing on the surface of the heat-sensitive breakdown recording layer or the discharge breakdown recording layer.

[0004]

However, when a copy-forgery-inhibited pattern is formed by a printing method, the recording on the heat-sensitive breakdown recording layer or the discharge breakdown recording layer or the reading of the magnetic recording is performed through the non-magnetic printing layer. Incomplete destruction of the heat-sensitive recording layer or the discharge-destruction recording layer, and a reduction in magnetic output due to the thickness of the printed layer when a magnetic recording layer is provided, poses a problem. Therefore, an object of the present invention is to form a tint block on a heat-sensitive recording layer by a simple process, to allow complete destruction of a predetermined portion of a heat-destruction recording layer or a discharge destruction recording layer, or to reduce a magnetic output or the like. It is an object of the present invention to provide a recording medium such as a card which does not cause a problem.

[0005]

According to the present invention, a first surface roughness portion and a first surface roughness portion are provided side by side.
Having a second surface roughness portion to form a tint block
Substrate, these first surface roughness portions and second surface roughness
More becomes thermosensitive recording print layer formed on the portion, the difference between the first and second surface roughness, the thermosensitive recording the Ri by the difference between the reflection density of the surface of the print layer second surface roughness The recording medium is set to such an extent that the portion appears as a background pattern. Here, the substrate is a nonmagnetic support (or an anchor coat formed thereon) or a magnetic layer formed on the nonmagnetic support (or an anchor coat formed thereon).

According to the present invention, since a copy-forgery-inhibited pattern is not formed by printing, a recording medium having good thermal recording characteristics and magnetic recording characteristics can be obtained.

[0007] The difference between the first and second surface roughness may be such that a tint block is formed. On the other hand, when the recording medium is a magnetic recording medium, these differences are set within 4 μm. If it is more than this, the electromagnetic characteristics fluctuate when the substrate surface layer is used as a magnetic recording medium.

[0008] A method for forming a tint block on the surface of a substrate is to form fine irregularities having different surface roughness between a tint block portion and a non- tint block portion on the surface of the substrate by mechanical pressure or heat of a gravure calender roll or the like. By uniformly applying, a tint block portion and a non- tint block portion are formed in the metal thin film layer formed thereon.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The case where the embodiment of the present invention is applied to a recording card (recording medium) having a magnetic recording layer and a heat-sensitive recording print layer will be described. However, the principle of the present invention can be applied to a recording medium having no magnetic recording layer. It is clear that can be applied. Referring to FIG. 1, in a recording card according to an embodiment of the present invention, a magnetic layer 2 for magnetic recording is formed on a base 1 by coating, and if necessary, the adhesion of the next heat-sensitive destruction recording layer 4 to the magnetic layer 2 is increased. A resin anchor coat 3 is formed (the one formed up to this point is referred to as a substrate in this specification), a heat-sensitive destruction recording layer 4 of Sn or the like is deposited, and a resin protective layer 5 is formed if desired. It is. The layers 2, 3, and 5 can be formed by any method such as a gravure printing method or a coating method.

In the above-mentioned laminating step, after the magnetic layer 2 is applied (or the anchor coat 3 is further formed) to obtain a substrate, a gravure calender roll is used to impart an uneven pattern having a different surface roughness to the surface of the substrate. I do. That is, as a gravure calender roll, the first roll to form a desired tint block
Of the substrate obtained by processing to provide a step so as to have the region of the above and the second region where the non-forgery-inhibited pattern is to be formed, and heating this or not to form the magnetic layer 2 Press In this way, as shown in FIG. 2, the surface roughness of the lower layer appears on the surface of the heat-sensitive destruction recording layer 4 or the protective layer 5, and the tint block portion 6 having a small surface roughness and the non- tint block portion 7 having a large surface roughness are recorded. Formed on the surface of the card. It is also possible to increase the surface roughness of the copy-forgery-inhibited pattern portion and decrease the surface roughness of the non-copy-forgery-inhibited pattern portion.

For example, the following materials can be used. Base: polyester film such as polyethylene terephthalate (PET), white PET (example of thickness: 18
8 μm, 250 μm), other polyesters, or conventional resin films or plates. Magnetic layer (dispersed in binder resin): γ-Fe ₂ O ₃ powder (Hc = 280-400 Oe), Co-γ-Fe ₂ O ₃ powder (Hc = 600-700 Oe), Ba powder (Hc = 1,800) ~
3,000 Oe), Fe, Co, Cr, Ni, or an alloy thereof, or any other magnetic powder for magnetic recording. Thermal recording print layer: Sn, In, S as thermal recording destruction layer
n-Pb, Sn-In, Al deposited metal film as a discharge breakdown recording layer. This layer can be formed by any of a plating method, a sputtering method, and an evaporation method. Binder resin for magnetic layer, resin for anchor coat, and resin for protective layer: UV curable acrylic resin, UV curable phosphazene, UV curable polystyrene, thermosetting acrylic resin, thermosetting styrene resin, thermosetting styrene acrylic Resin, thermosetting polyester resin, urethane resin, polyamide, polyimide resin, etc. The resin for the protective layer does not adhere to the head after printing with the thermal head. Example 1 A coercive force Hc = 2 on a PET film having a thickness of 188 μm.
750 Oe barium ferrite and thermosetting styrene
A magnetic coating composed of an acrylic resin binder was applied by a gravure coating method to form a magnetic recording layer composed of a magnetic coating having a thickness of 15 μm, and was thermally cured. Before being completely thermally cured, a gravure calender roll having a step of 1 μm or more between the tint block region and the non- tint block region of the substrate thus obtained is heated and pressed at various speeds, and the surface of the substrate has a different surface roughness. An uneven pattern was provided. Next, Sn is set to 500 °
, And a thermosetting styrene-acrylic resin protective layer was formed to a thickness of 2 μm. The results in Table 1 were obtained.

[0012]

[Table 1]

It was confirmed that a tint block was clearly formed under any of the conditions.

As described above, since the reflection density of light on the surface of the recording medium of the present invention is different between the copy-forgery-inhibited pattern portion and the non-copy-forgery-inhibited pattern portion, the copy-forgery-inhibited pattern can be determined. Also, since the present invention does not have a print layer on the surface, the present invention can form a ground tint without impairing magnetic characteristics or thermal recording characteristics, and can further increase security.

[Brief description of the drawings]

FIG. 1 is a sectional view of a recording medium of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the recording medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base (support) 2 Magnetic layer for magnetic recording 3 Anchor coat 4 Heat-sensitive destruction recording layer 5 Protective layer 6 Background pattern part 7 Non-background pattern part

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B42D 5/00-15/10 551 B41M 5/26 G06K 19/06 G11B 5/00

Claims (4)

(57) [Claims] 1. A portion having a first surface roughness and said first surface roughness
The second part that is attached to the part and should form a tint block
Substrate and these first surface having a surface roughness of the portion of the
Becomes more and roughness of the portion and the heat-sensitive recording print layer formed on the second surface roughness of the portion, the difference of the first and second surface roughness, reflection density of the surface of the thermosensitive recording printing layer recording medium difference by Ri <br/> the second surface roughness portion of the is defined to the extent that appears as a background pattern. 2. A substrate comprising a non-magnetic substrate and a non-magnetic substrate formed thereon.
A magnetic layer for magnetic recording, wherein the first and second
The surface roughness portion is formed on the magnetic layer for magnetic recording.
Recording medium according to claim 1 that. 3. The thermosensitive recording print layer is composed of Sn, In, Sn-P.
b, Sn-In and Al made of metal thin film which is selected from claims 1 or 2 records medium. Wherein the first and second surfaces difference roughness is within 4μm claim 2 or 3 records medium.