JPH0542651A - Bright hidden-pattern indication sheet - Google Patents

Abstract

PURPOSE:To obtain a bright hidden-pattern indication sheet, on which a hidden pattern can be distinguished from its surrounding background and clearly seen only when it is seen from a predetermined angle, at a low cost by a gravure printing technique. CONSTITUTION:A title sheet is formed by laminating a base layer 8, a light reflecting layer 7, a transparent uneven printing layer 5 having an uneven printing surface, and a transparent protective layer 3 in this order from the bottom. The uneven lower surface of the uneven printing layer 5 consists of a background part 1 and a hidden pattern part 2. The hidden pattern part 2 is made of a recessed and projected pattern of parallel straight lines arranged in a fixed direction. On the other hand, the background part 1 surrounding the hidden pattern part 2 is made of a recessed and projected pattern oriented in a direction different from that of the recessed and projected straight line pattern of the hidden pattern part 2. When this sheet is seen from a fixed direction, the hidden pattern part 2 can be distinguished from the background part 1 and clearly seen because of the difference of the hidden pattern part 2 from the background part 1 in light reflecting condition. On the other hand, from the other visual angle, the hidden pattern part 2 is seen in perfect harmony with the background part 1 and cannot be recognized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glittering concealed pattern display sheet, and more specifically, a concealed pattern such as a picture or a character is formed on a part of the sheet, and only when viewed from a specific direction. The present invention relates to a glittering hidden pattern display sheet in which the hidden pattern is clearly visible and, when viewed from another direction, the hidden pattern is integrated with the background so that the hidden pattern is indistinguishable.

[0002]

2. Description of the Related Art One of the purposes of this type of glittering hidden pattern display sheet is to aim at a design effect as a kind of decorative sheet, and the other one is to form a hidden pattern delicately. By applying the sheet to the display target object, the display target object serves as a true / false determination unit.

Usually, this type of glittering concealed pattern display sheet is conventionally made by utilizing a hologram technique. As is well known, the glittering concealed pattern display sheet produced by this hologram technique is very elaborate and is very excellent for achieving the above object. However, there is a drawback in that the manufacturing cost becomes very high when this hologram technique is used.

[0004]

Therefore, the technical problem to be solved by the present invention is to reduce the cost at a low cost by utilizing a conventionally known simple printing technique, specifically, a gravure printing technique. Another object of the present invention is to provide a glittering hidden pattern display sheet.

[0005]

In order to solve the above technical problems, the present invention provides a glittering concealed pattern display sheet having the following constitution.

One glittering hidden pattern display sheet comprises a base layer, a light reflecting layer, a transparent uneven printed layer having an uneven lower surface,
A transparent surface protective layer and a transparent surface protective layer are laminated in order from the bottom. The uneven lower surface of the transparent uneven printed layer is composed of a background portion and a hidden pattern portion. The hidden pattern portion is formed as a parallel linear uneven pattern aligned in a certain direction. On the other hand, the background portion around the hidden pattern portion is formed with an uneven pattern having a directionality different from the direction of the linear uneven pattern of the hidden pattern portion. In the above structure, the external light incident on this sheet is reflected by the light reflecting layer, and the reflected light forms an optical pattern corresponding to the uneven pattern on the uneven lower surface of the transparent uneven printed layer. However, in the above configuration, the directionality of the linear uneven pattern is different between the concavo-convex lower surface of the hidden handle portion and the concavo-convex lower surface of the surrounding background portion,
Depending on the viewing angle, the hidden pattern part may be clearly distinguished from the background part, or the hidden pattern part and the background part may be seen as a single mixture. That is, when viewing at a viewing angle where the background pattern is poorly reflected, while the hidden pattern is highly reflective,
On the contrary, the hidden pattern is clearly visible when viewed from a viewing angle where the background has a large amount of reflection and the hidden pattern has a small amount of reflection. Then, at the intermediate viewing angle, the background portion and the pattern portion are mixed and integrated, and the hidden pattern portion is hidden by the background portion.

The transparent concavo-convex printed layer in the above structure is most preferably formed by conventional gravure printing. By this gravure printing method, it is possible to form an elaborate concavo-convex pattern, and by adjusting the plate depth, it is possible to easily adjust the concavo-convex depth. Also,
The light reflecting layer can be easily formed by vapor deposition of a metal such as aluminum, and the base layer can be easily laminated integrally with the transparent surface protective layer by a conventional laminating process or printing method. In this way, according to the present invention, the glittering hidden pattern display sheet can be provided at an extremely low cost.

In the above construction, both the hidden pattern portion and the background portion around the hidden pattern portion are formed in a concavo-convex pattern. However, instead of this, only one of them is formed in a concavo-convex pattern, and the other is formed as a flat surface. Good. Also in this case, at a certain viewing angle, the hidden handle portion can be clearly recognized in a state of being distinguished from the background portion, and at other viewing angles, the hidden handle portion and the background portion are mixed and integrated. Cannot be clearly identified. In this way, these modifications can achieve the intended purpose as in the case of the above configuration.

[0009]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention.

As shown in FIG. 2, this glittering hidden pattern display sheet has a laminated structure. That is, the base layer 8, the anchor coat layer 7, the light reflection layer 6, the transparent uneven printed layer 5, the pattern printed layer 4, and the transparent surface protective layer 3 are sequentially laminated in this order from the bottom. In the above structure, the pattern print layer 4 is optional and is formed as needed. The light reflecting layer 6 is usually formed on the lower surface of the uneven printed layer 5 by a metal vapor deposition technique of aluminum. Base layer 8
Is usually formed by a heat seal layer. As an example of a suitable material used for each of the above layers, the surface protection layer 3 is made of polyester, the anchor coat layer 7 is made of ethylene-acrylic acid copolymer, and the base layer 8 is made of polyethylene. It

As the concavo-convex printing layer 5, a solid content of 50% by weight of acrylic urethane resin and 10% by weight of cellulose resin and a solvent (for example, a mixed solution of ethyl acetate and toluene) 4
An ink material in which an isocyanate as a curing agent, specifically, toluidine diisocyanate is added to a main material composed of 0% by weight is preferably used.

As shown in FIG. 2, an uneven pattern is formed on the lower surface of the uneven print layer 5. The concavo-convex printing layer 5 having the concavo-convex pattern is formed by gravure printing on the lower surface of the surface protective layer 3 on which the pattern printing layer 4 is printed.

The state of the lower surface of the uneven printed layer 5 is shown in FIG.
Is shown in. In Fig. 1, "d" shown in the center
Is a hidden pattern portion 2, and the periphery thereof is a background portion 1. As is apparent from FIG. 1, the hidden pattern portion 2 of “d” is formed in a parallel linear concave-convex pattern having a directionality from the upper right to the lower left. On the other hand, the background portion 1 around the hidden handle portion 2 is formed by a large number of parallel linear concave-convex patterns having a directionality from the upper left to the lower right. However, at a position apart from the hidden pattern portion 2 of the background portion 2 shown in FIG. 1, background pattern portions 1'arranged in a checkered pattern are formed for design purposes. Each of the background pattern portions 1 ′ is formed with a parallel linear concave-convex pattern having the same directionality as the hidden pattern portion 2.

The asperity depth of the asperity pattern of the asperity printing layer 5 is preferably 3 to 20 .mu., And most preferably about 5 .mu.m. Also,
The width between each linear convex portion or linear concave portion is 20 to 3
00μ is preferable.

According to the glittering concealed pattern display sheet having the above-mentioned structure, for example, when external light is incident on the sheet from diagonally upper left in FIG. 1, the concealed pattern portion 2 and the background pattern portion 1'of a checkerboard pattern are provided. The amount of reflection and the direction of reflection are completely different between the reflection of the concave-convex pattern and the reflection of the background portion 1 around the hidden pattern portion 2. Therefore, in such a case, when viewed from a certain angle, the hidden handle portion 2 is clearly visible to the viewer in a state of being distinguished from the background portion 1. On the other hand, when external light is incident obliquely from above in the center of FIG. 1, the reflections of the hidden handle portion 2 and the background portion 1 become equivalent, and in this case, the hidden handle portion 2 and the background portion 1 are separated from each other. They cannot be clearly identified as one by one.

FIG. 3 shows a first modification of the present invention. In this modified example, the concavo-convex pattern similar to that of FIG. 1 is attached to the hidden pattern portion 2a, but the lower surface of the concavo-convex printed layer 5 in the background portion 1a is formed into a flat surface. Further, FIG. 4 shows another modification, which is the reverse of the modification of FIG. 3, in which the lower surface of the concavo-convex printing layer 5 in the hidden pattern portion 2b is formed into a flat surface, The background portion 1b around it is provided with a parallel straight line uneven pattern similar to that shown in FIG.

In any of the modified examples shown in FIGS. 3 and 4, the hidden handle portions 2a and 2b can be distinguished from the background portions 1a and 1b depending on the viewing angle of the observer and can be visually recognized well, but at other angles. The hidden handle portions 2a, 2b and the background portions 1a, 1b are mixed and integrated, and the hidden handle portions are not clearly identified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a concavo-convex pattern formed on a lower surface of a concavo-convex printed layer of a glittering hidden pattern display sheet according to an example of the present invention.

FIG. 2 is a cross-sectional view of the glittering hidden pattern display sheet of FIG.

FIG. 3 is an explanatory diagram showing a first modified example of FIG. 1.

FIG. 4 is an explanatory diagram showing a second modified example of FIG. 1.

[Explanation of symbols]

1,1a, 1b Background part 1'Background pattern part 2,2a, 2b Hidden pattern part 3 Surface protection layer 4 Pattern printing layer 5 Roughness printing layer 6 Light reflection layer 7 Anchor coat layer 8 Base layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B05D 5/06 104 B 8616-4D C23C 14/06 8414-4K

Claims (3)

[Claims] 1. A base layer (8), a light reflection layer (7), a transparent uneven printed layer (5) having an uneven lower surface, and a transparent surface protective layer.
(3) is laminated in order from the bottom, and the uneven lower surface of the transparent uneven printed layer (5) is composed of the background portion (1) and the hidden pattern portion (2), and the hidden pattern portion (2). Are formed in parallel straight line uneven patterns aligned in a certain direction, while the background part (1) around the hidden pattern part (2) is
A glittering hidden pattern display sheet, characterized by being formed with an uneven pattern having a directionality different from the direction of the linear uneven pattern of the hidden pattern part (2). 2. A base layer (8), a light reflection layer (7), a transparent uneven printed layer (5) having an uneven lower surface, and a transparent surface protective layer.
(3) is laminated in order from the bottom, and the uneven lower surface of the transparent uneven printed layer (5) is composed of the background portion (1a) and the hidden pattern portion (2a), and the hidden pattern portion (2a). Is formed with parallel straight concave and convex patterns aligned in a certain direction, while the hidden handle
A glittering hidden pattern display sheet characterized in that the background portion (1a) around (2a) is a flat surface. 3. A base layer (8), a light reflection layer (7), a transparent uneven printed layer (5) having an uneven lower surface, and a transparent surface protective layer.
(3) is laminated in order from the bottom, and the uneven lower surface of the transparent uneven printed layer (5) is composed of the background portion (1b) and the hidden pattern portion (2b), and the hidden pattern portion (2b). Is a flat surface, while the background portion (1b) around the hidden pattern portion (2b) is formed by parallel straight line uneven patterns aligned in a certain direction, a glittering hidden pattern display sheet.