Copy-proof media

JP7871592B2Active Publication Date: 2026-06-09TOPPAN HOLDINGS INC

Patent Information

Authority / Receiving Office: JP · JP
Patent Type: Patents
Current Assignee / Owner: TOPPAN HOLDINGS INC
Filing Date: 2022-04-27
Publication Date: 2026-06-09

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【0012】 上記の課題を解決する手段として、本発明の複写防止媒体の第1の態様は、第1主面とその裏面である第2主面とを有している光透過性基材と、前記第1主面上に形成した白黒画像のパターンからなり、黒色部分に相当する第1着色部及び白色部分に相当する第1非着色部を含み、前記第2主面上には、前記第1非着色部に対応して形成した前記第1着色部とは異なる色の少なくとも1種類以上からなる第2着色部及び第2非着色部の交互の万線状の配列からなる着色画像を含み、前記第1主面上に形成した白黒画像を反射観察した場合には前記第2主面上に形成した前記第2着色光は透過させず、前記第1主面上に形成した白黒画像を透過観察した場合には前記第2主面上に形成した前記第2着色光を透過させ、前記第2主面上の配列方向において隣り合った前記第2着色部の距離及び前記第2非着色部間の距離が5μm以上、20μm以下の範囲内で、かつ、前記第2着色部のパターンに占める割合が25%以上、50%以下の範囲内である万線状の着色画像パターンとを備えた複写防止媒体である。

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Abstract

To discriminate an original from a copy through naked eyes or observation enlarged with low magnification.SOLUTION: A copy protection medium includes a line-pattern-like colored image pattern which is composed of a pattern of a white black image formed on the surface of a light permeable base material, includes a surface colored part corresponding to a black part and a surface non-colored part corresponding to a white part, includes a colored image composed of alternate line-pattern-like arrangement of a rear face colored part and a rear face non-colored part composed of at least one color different from the surface colored part formed corresponding to the surface non-colored part, on the rear face, does not permeate rear face colored light formed on the rear face when the white black image formed on the surface is reflectively observed, and permeates the rear face colored light formed on the rear face when the white black image formed on the surface is permeably observed, wherein a distance between the adjacent rear face colored parts and a distance between the rear face non-colored parts in an arrangement direction on the rear face are within a range of 5 μm or more and 20 μm or less, and a ratio in the pattern of the rear face colored part is within a range of 25% or more and 50% or less.SELECTED DRAWING: Figure 2

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Claims

1. A copy-prevention medium comprising: a light-transmitting substrate having a first main surface and a second main surface which is the back surface thereof; and a colored image pattern formed on the first main surface, comprising a pattern of a black and white image, including a first colored portion corresponding to a black portion and a first uncolored portion corresponding to a white portion, wherein the second main surface includes a colored image consisting of an alternating linear arrangement of second colored portions and second uncolored portions, each consisting of at least one color different from the first colored portion and formed corresponding to the first uncolored portion, wherein the distance between adjacent second colored portions and the distance between second uncolored portions in the arrangement direction on the second main surface is within the range of 5 μm to 20 μm, and the proportion of the second colored portion in the pattern is within the range of 25% to 50%.

2. The copy-prevention medium according to claim 1, wherein the second colored portion and the second uncolored portion are patterned in a linear fashion on the back surface of the first uncolored portion.

3. The copy-prevention medium according to claim 1 or claim 2, wherein the second colored portion and the second uncolored portion each have a linear or curved shape and are arranged alternately in the width direction.