JP2011037234A - Latent image printed matter - Google Patents

Latent image printed matter Download PDF

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JP2011037234A
JP2011037234A JP2009189222A JP2009189222A JP2011037234A JP 2011037234 A JP2011037234 A JP 2011037234A JP 2009189222 A JP2009189222 A JP 2009189222A JP 2009189222 A JP2009189222 A JP 2009189222A JP 2011037234 A JP2011037234 A JP 2011037234A
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printing element
ink
latent image
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image
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JP5233057B2 (en
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Tadashi Morinaga
匡 森永
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a latent image printed matter used as a security printed matter which requires anticounterfeit effect such as a banknote, a passport, securities, an ID, a card, and a ticket, in which a printed image visible under reflecting light and a printed image visible under transmitted light show changing effect. <P>SOLUTION: The latent image printed matter includes a light reflecting image and a light transmitting image both formed by using two inks in combination, as a pair ink, which show the same color under reflecting light when printed on the base material but differ in transmission, thereby achieving excellence in authenticity check and anticounterfeit effect. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、偽造防止効果を必要とするセキュリティ印刷物である銀行券、パスポート、有価証券、身分証明書、カード、通行券等の貴重印刷物の分野において、反射光下で視認可能な印刷画像と、透過光下で視認可能な印刷画像が、変化する効果を生じる潜像印刷物に関わるものである。   The present invention is a printed image that is visible under reflected light in the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matter that requires an anti-counterfeit effect, A printed image visible under transmitted light relates to a latent image printed matter that produces a changing effect.

近年のスキャナ、プリンタ、カラーコピー機等のデジタル機器の進展により、貴重印刷物の精巧な複製物を容易に作製することが可能となっている。そのような複製や偽造を防止する偽造防止技術の一つとして、メタメリックペアインキを用いる技術がある。   With recent developments in digital devices such as scanners, printers, and color copiers, it has become possible to easily produce elaborate copies of precious printed matter. As one of anti-counterfeiting techniques for preventing such duplication and forgery, there is a technique using a metameric pair ink.

メタメリックペアインキを用いた偽造防止技術は、照明の光源や種類や特定波長の光を透過するフィルタの介在により、インキが同色に見えたり、異なった色に見えたりする特性を利用するものである。偽造防止印刷の分野において、このようにインキのメタメリズムによる光学特性を利用する方法は従来から行われている。   Anti-counterfeiting technology using metameric pair inks uses the characteristics that the ink looks the same color or looks different due to the light source and type of illumination and the filter that transmits light of a specific wavelength. is there. In the field of anti-counterfeit printing, a method of utilizing the optical characteristics due to the ink metamerism is conventionally performed.

例えば、太陽光、蛍光灯又は白熱電球等による通常光下においては同色に見えるが、所定の分光エネルギー分布を有する光源の下で見るか、所定のフィルタを通して見るか、あるいは所定のフィルタを通過させた光の下で見ると、一方が異なった色相に見えるメタメリックな性質を有する二種類の色料によってパターンを互いに対比観察できるように基材上に形成することを特徴とした画像形成体が開示されている(例えば、特許文献1参照)。   For example, it looks the same color under normal light such as sunlight, fluorescent light or incandescent light bulb, but it is viewed under a light source having a predetermined spectral energy distribution, through a predetermined filter, or passed through a predetermined filter. Disclosed is an image forming body characterized in that a pattern is formed on a base material so that a pattern can be contrasted and observed by two kinds of colorants having one of different colors that looks different when viewed under bright light. (For example, refer to Patent Document 1).

一方、偽造防止技術の代表的な技術の一つとして、用紙の粗密や薄厚によって模様を形成して透過光で模様を視認させる、いわゆる透かしが存在する。しかし、この技術は用紙の製造段階で形成する必要があることから用紙メーカでなければ製造不可能であり、加えて用紙メーカが製造した場合でも製造コストが高くなるという問題があることから、これを擬似的に再現する方法として、印刷工程で特殊なインキ(例えば、特許文献2参照)を用いてこの透かしに相当する透過画像を形成する偽造防止技術が存在する(例えば、特許文献3参照)。この技術もデジタル機器を用いたとしても複写不可能であるという特徴を備えている。   On the other hand, as one of the representative techniques for preventing counterfeiting, there is a so-called watermark in which a pattern is formed by the density and thickness of paper and the pattern is visually recognized by transmitted light. However, since this technology needs to be formed at the paper manufacturing stage, it cannot be manufactured unless it is a paper manufacturer. In addition, even if manufactured by a paper manufacturer, there is a problem that the manufacturing cost increases. Is a forgery prevention technique for forming a transmission image corresponding to this watermark using a special ink (for example, see Patent Document 2) in a printing process (for example, see Patent Document 3). . This technology also has a feature that copying is impossible even if a digital device is used.

特公昭60−58711号公報Japanese Patent Publication No. 60-58711 特開2000−290571号公報JP 2000-290571 A 特開平6−228900号公報JP-A-6-228900

しかしながら、メタメリックペアインキで形成した偽造防止用印刷物の真偽を判別するためには、所定の分光エネルギー分布を有する光源の下で見るか、所定のフィルタを通して見るか、あるいは所定のフィルタを通過させた光の下で見る必要があり、専用の光源かフィルタを備える必要があった。これは、透かしのように印刷物を手にした万人が簡便に真偽判別を行えるものではなく、判別できる者が限定されるという問題があった。   However, in order to determine the authenticity of the anti-counterfeit printed matter formed with the metameric pair ink, it is viewed under a light source having a predetermined spectral energy distribution, viewed through a predetermined filter, or passed through a predetermined filter. It was necessary to look under the light, and it was necessary to provide a dedicated light source or filter. This is a problem that everyone who has a printed material like a watermark cannot easily determine authenticity, and the number of persons who can determine is limited.

また、特定のインキを用いて透過光で透かしのような透過画像を認証する透かし印刷を用いた偽造防止技術に関しては、浸透型インキ自体が多くのメーカから市販されており、一般人であっても容易に入手可能であって、偽造者にとっても製造が容易であるという問題があった。また、半透明あるいは透明なインキで形成しても、インキが浸透した領域は油染みのような濃い色に変色して観察されるため、用紙の粗密や薄厚によって模様を形成する透かしと比較して、透過画像が反射光下でも容易に視認されてしまうという問題があった。反射画像として視認しづらい程度にインキ量を抑えると、透過画像は不鮮明となり、透過画像が視認しやすい程度にインキ量を増やすと、反射画像として強く現れてしまう傾向にある。   In addition, with regard to anti-counterfeiting technology using watermark printing that authenticates a transmitted image such as a watermark with transmitted light using specific ink, penetrating ink itself is commercially available from many manufacturers, even for ordinary people There is a problem that it is easily available and easy to manufacture for counterfeiters. In addition, even if it is formed with semi-transparent or transparent ink, the area where the ink penetrates is observed as a dark color such as oil stain, so compared with the watermark that forms the pattern due to the density or thinness of the paper There is a problem that the transmitted image is easily visually recognized even under reflected light. When the amount of ink is suppressed to such a level that it is difficult to visually recognize as a reflected image, the transmitted image becomes unclear, and when the amount of ink is increased to such an extent that the transmitted image is easily visible, it tends to appear strongly as a reflected image.

本発明は、前述した課題の解決を目的とするものであり、基材に印刷した場合に反射光下では等色に観察されるが、透過率が異なる二つのインキを組み合わせてペアインキとして用い、反射画像と透過画像とを形成する潜像印刷物であって、メタメリックペアインキで形成した偽造防止印刷物のように、特殊な光源やフィルタを必要とせず、透かし印刷のように市販のインキが入手できただけでは形成が不可能であり、透過画像は極めて鮮明に視認できるとともに、反射光で観察した際には、透過画像がどのような画像であるかを判別することが困難な真偽判別と偽造防止効果に優れた潜像印刷物に関わる。   The present invention is intended to solve the above-mentioned problems, and is observed in the same color under reflected light when printed on a base material, but is used as a pair ink by combining two inks having different transmittances. A latent image print that forms a reflection image and a transmission image, and does not require a special light source or filter like the anti-counterfeit print formed with a metameric pair ink, and a commercially available ink is obtained like watermark printing It is impossible to form the image by just doing it, and the transmitted image can be seen very clearly, and it is difficult to determine what the transmitted image is when viewed with reflected light. And latent image prints with excellent anti-counterfeiting effects.

本発明の潜像印刷物は、基材上の少なくとも一部に、基材と異なる色の印刷画像が形成されて成る潜像印刷物において、印刷画像は、第一のインキで形成された第一の印刷要素と第二のインキで形成された第二の印刷要素から構成され、第一の印刷要素の分光反射率と、第二の印刷要素の分光反射率は、等しい分光反射率を有するとともに、第一の印刷要素の分光反射率及び第二の印刷要素の分光反射率は、基材の分光反射率より低い分光反射率を有し、基材の分光透過率及び第一の印刷要素の分光透過率は、第二の印刷要素の分光透過率より低い分光透過率を有し、反射光下で観察した場合は、印刷画像が視認され、透過光下で観察した場合には、第二の印刷要素が視認されることを特徴とする。   The latent image printed material of the present invention is a latent image printed material in which a printed image of a color different from that of the substrate is formed on at least a part of the substrate, and the printed image is a first ink formed with a first ink. It is composed of a printing element and a second printing element formed with a second ink, the spectral reflectance of the first printing element and the spectral reflectance of the second printing element have equal spectral reflectance, The spectral reflectance of the first printing element and the spectral reflectance of the second printing element have a spectral reflectance lower than the spectral reflectance of the substrate, the spectral transmittance of the substrate and the spectral reflectance of the first printing element. The transmittance has a spectral transmittance lower than the spectral transmittance of the second printing element, and when viewed under reflected light, the printed image is visible, and when observed under transmitted light, the second The printing element is visually recognized.

本発明の潜像印刷物は、400nmから700nmの波長域において、第二の印刷要素における透過スペクトルの積分値が、第一の印刷要素における透過スペクトルの積分値の120%以上を有することを特徴とする。   The latent image printed matter of the present invention is characterized in that, in a wavelength range of 400 nm to 700 nm, the integral value of the transmission spectrum in the second printing element has 120% or more of the integral value of the transmission spectrum in the first printing element. To do.

本発明の潜像印刷物は、基材の分光透過率と、第一の印刷要素の分光透過率は、等しい分光透過率を有することを特徴とする。   The latent image printed matter of the present invention is characterized in that the spectral transmittance of the substrate and the spectral transmittance of the first printing element have the same spectral transmittance.

本発明の潜像印刷物は、第一の印刷要素の面積率と第二の印刷要素の面積率は、50%以上100%以下であることを特徴とする。   The latent image printed material of the present invention is characterized in that the area ratio of the first printing element and the area ratio of the second printing element are 50% or more and 100% or less.

本発明の潜像印刷物は、第一のインキ及び第二のインキは、機能性材料を混合して成ることを特徴とする。   The latent image printed matter of the present invention is characterized in that the first ink and the second ink are formed by mixing functional materials.

本発明の潜像印刷物においては、印刷物を反射光下で観察した際と、透過光で観察した際とで、異なる画像が観察されることを確認することで真偽判別が可能であり、特殊な光源やフィルタを必要とせず、特別な道具を用いる必要がない。   In the latent image printed matter of the present invention, it is possible to determine whether the printed matter is observed under reflected light or not by confirming that different images are observed when observed with transmitted light. No need for special light sources and filters, and no need for special tools.

本発明の潜像印刷物は、市販されている浸透型インキを単に印刷するだけでは形成不能であり、これを形成するにあたっては基材に印刷した場合に浸透型インキと反射光下では等色であって、透過率が異なる光学特性を有するもう一方のインキを作製する必要があり、そのためにはインキ製造のための技能と設備が必要となることから、容易に偽造することは不可能である。   The latent image printed matter of the present invention cannot be formed by simply printing a commercially available penetrating ink, and in forming this, when printed on a base material, it is the same color under penetrating ink and reflected light. Therefore, it is necessary to produce another ink having optical characteristics with different transmittances. For this purpose, it is impossible to easily counterfeit because it requires skills and equipment for ink production. .

本発明の潜像印刷物においては、そもそも透過画像は反射画像として可視化させることを特徴の一つとしており、従来の透かし印刷の技術のように用紙に転移させる浸透型インキの量に制限を設ける必要がないため、極めて鮮明な透過画像が形成できる。   The latent image printed material of the present invention is characterized in that the transmitted image is visualized as a reflected image in the first place, and it is necessary to limit the amount of penetrating ink transferred to paper as in the conventional watermark printing technique. Therefore, a very clear transmission image can be formed.

以上の手法で形成した潜像印刷物は、生産性の高い印刷方式であるオフセット印刷で製造可能であることからコストパフォーマンスに優れ、また最新のデジタル機器を用いたとしても透過画像の再現は不可能であることから、偽造防止効果に優れる。   The latent image printed matter formed by the above method can be manufactured by offset printing, which is a highly productive printing method, so it has excellent cost performance, and transmission images cannot be reproduced even with the latest digital equipment. Therefore, the anti-counterfeiting effect is excellent.

本発明における潜像印刷物を示す。The latent image printed matter in this invention is shown. (a)は、本発明における第一の印刷要素を示し、(b)は、本発明における第二の印刷要素を示す。(A) shows the 1st printing element in this invention, (b) shows the 2nd printing element in this invention. 第一のインキ及び第二のインキ、並びに基材の分光反射率を示す。The spectral reflectance of a 1st ink and 2nd ink and a base material is shown. 第一のインキ及び第二のインキ、並びに基材の分光透過率を示す。The spectral transmittance of a 1st ink, a 2nd ink, and a base material is shown. 透過スペクトルの積分値を示す。The integrated value of the transmission spectrum is shown. (a)は本発明の潜像印刷物を反射光で観察した際に視認される画像を示し、(b)は本発明の潜像印刷物を透過光で観察した際に視認される画像を示す。(A) shows the image visually recognized when the latent image printed material of the present invention is observed with reflected light, and (b) shows the image visually recognized when the latent image printed material of the present invention is observed with transmitted light. 本発明における潜像印刷物を示す。The latent image printed matter in this invention is shown. (a)は本発明の潜像印刷物における第一の印刷要素を示し、(b)は本発明の潜像印刷物における第二の印刷要素を示す。(A) shows the 1st printing element in the latent image printed matter of this invention, (b) shows the 2nd printing element in the latent image printed matter of this invention. (a)は本発明の潜像印刷物を反射光で観察した際に視認される画像を示し、(b)は本発明の潜像印刷物を透過光で観察した際に、視認される画像を示す。(A) shows an image visually recognized when the latent image printed material of the present invention is observed with reflected light, and (b) shows an image visually recognized when the latent image printed material of the present invention is observed with transmitted light. . 本発明の一実施例における潜像印刷物を示す。1 shows a latent image printed material according to an embodiment of the present invention. (a)は本発明の一実施例における第一の印刷要素を示し、(b)は本発明の一実施例における第二の印刷要素を示す。(A) shows the first printing element in one embodiment of the present invention, and (b) shows the second printing element in one embodiment of the present invention. (a)は本発明の一実施例における潜像印刷物を反射光で観察した際に視認される画像を示し、(b)は本発明の一実施例における潜像印刷物を透過光で観察した際に視認される画像を示す。(A) shows the image visually recognized when the latent image printed matter in one embodiment of the present invention is observed with reflected light, and (b) shows the latent image printed matter in one embodiment of the present invention when observed with transmitted light. Shows an image visually recognized.

本発明を実施するための形態について、図面を参照して説明する。しかしながら、本発明は、以下に述べる実施するための形態に限定されるものではなく、特許請求の範囲記載における技術的思想の範囲内であれば、その他のいろいろな実施の形態が含まれる。   DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

次に、本発明の実施形態について図面を用いて説明する。図1は、本発明における潜像印刷物を示す。図2(a)は、本発明の潜像印刷物における第一の印刷要素を示し、(b)は、本発明の潜像印刷物における第二の印刷要素を示す。図3は、本発明の潜像印刷物を形成する第一の印刷要素及び第二の印刷要素並びに基材の分光反射率を示す。図4は、本発明の潜像印刷物を形成する第一の印刷要素及び第二の印刷要素並びに基材の分光透過率を示す。図5は、透過スペクトルの積分値を示す。図6(a)は、本発明の潜像印刷物を反射光で観察した際に、視認される画像を示し、(b)は、本発明の潜像印刷物を透過光で観察した際に、視認される画像を示す。図7は、本発明における潜像印刷物を示す。図8(a)は、本発明の潜像印刷物における第一の印刷要素を示し、(b)は、本発明の潜像印刷物における第二の印刷要素を示す。図9(a)は、本発明の潜像印刷物を反射光で観察した際に、視認される画像を示し、(b)は、本発明の潜像印刷物を透過光で観察した際に、視認される画像を示す。図10は、本発明の一実施例における潜像印刷物を示す。図11(a)は、本発明の一実施例における潜像印刷物の第一の印刷要素を示し、(b)は、本発明の一実施例における潜像印刷物の第二の印刷要素を示す。図12(a)は、本発明の一実施例における潜像印刷物を反射光で観察した際に、視認される画像を示し、(b)は、本発明の一実施例における潜像印刷物を透過光で観察した際に、視認される画像を示す。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a latent image print according to the present invention. FIG. 2A shows a first printing element in the latent image print of the present invention, and FIG. 2B shows a second printing element in the latent image print of the present invention. FIG. 3 shows the spectral reflectance of the first and second printing elements and the substrate that form the latent image print of the invention. FIG. 4 shows the spectral transmittance of the first and second printing elements and the substrate that form the latent image print of the invention. FIG. 5 shows the integral value of the transmission spectrum. FIG. 6A shows an image that is visually recognized when the latent image printed material of the present invention is observed with reflected light, and FIG. 6B is a visual image when the latent image printed material of the present invention is observed with transmitted light. The image to be displayed is shown. FIG. 7 shows a latent image print according to the present invention. FIG. 8A shows a first printing element in the latent image print of the present invention, and FIG. 8B shows a second printing element in the latent image print of the present invention. FIG. 9A shows an image that is visually recognized when the latent image printed material of the present invention is observed with reflected light, and FIG. 9B is an image that is visually recognized when the latent image printed material of the present invention is observed with transmitted light. The image to be displayed is shown. FIG. 10 shows a latent image printed material according to an embodiment of the present invention. FIG. 11A shows a first printing element of the latent image printed matter in one embodiment of the present invention, and FIG. 11B shows a second printing element of the latent image printed matter in one embodiment of the present invention. FIG. 12A shows an image that is visually recognized when the latent image printed matter in one embodiment of the present invention is observed with reflected light. FIG. 12B shows the latent image printed matter in one embodiment of the present invention. An image visually recognized when observed with light is shown.

図1に本発明の潜像印刷物(1)を示す。潜像印刷物(1)は、基材(2)の上に、基材と異なる色を有する印刷画像(3)が形成されて成る。印刷画像(3)は、図2(a)に示す「A」の文字から成る第一の印刷要素(4)と図2(b)に示す「B」の文字から成る第二の印刷要素(5)から構成されており、「A」の文字から成る第一の印刷要素(4)と「B」の文字から成る第二の印刷要素(5)は、それぞれ異なるインキで形成されている。具体的には、図2(a)に示す「A」の文字から成る第一の印刷要素(4)は、第一のインキを用いて形成され、図2(b)に示す「B」の文字から成る第二の印刷要素(5)は、第二のインキを用いて形成されている。   FIG. 1 shows a latent image print (1) of the present invention. The latent image printed matter (1) is formed by forming a printed image (3) having a color different from that of the substrate on the substrate (2). The print image (3) includes a first print element (4) made up of the letter “A” shown in FIG. 2A and a second print element made up of the letter “B” shown in FIG. 5), the first printing element (4) consisting of the letter "A" and the second printing element (5) consisting of the letter "B" are formed of different inks. Specifically, the first printing element (4) consisting of the letter “A” shown in FIG. 2 (a) is formed using the first ink, and the first printing element (4) shown in FIG. The second printing element (5) consisting of letters is formed using a second ink.

第一の印刷要素(4)の面積率及び第二の印刷要素(5)の面積率は、50%以上100%以下の範囲で形成する。この理由は、第一の印刷要素(4)及び第二の印刷要素(5)を面積率50%未満で形成した場合、本発明の潜像印刷物(1)を透過光下で観察した際、視認性が悪くなるためである。また、第一の印刷要素(4)の面積率と第二の印刷要素(5)の面積率は、同じ面積率で形成しても良く、異なる面積率で形成しても良い。なお、第一の印刷要素(4)と第二の印刷要素(5)は、階調表現をすることも可能であり、その場合、第一の印刷要素(4)の面積率及び第二の印刷要素(5)の面積率は、0%以上100%以下の範囲で形成する。   The area ratio of the first printing element (4) and the area ratio of the second printing element (5) are formed in the range of 50% to 100%. This is because when the first printing element (4) and the second printing element (5) are formed with an area ratio of less than 50%, the latent image print (1) of the present invention is observed under transmitted light. This is because the visibility deteriorates. Further, the area ratio of the first printing element (4) and the area ratio of the second printing element (5) may be formed with the same area ratio, or may be formed with different area ratios. Note that the first printing element (4) and the second printing element (5) can also express gradation, in which case the area ratio of the first printing element (4) and the second printing element (4) The area ratio of the printing element (5) is 0% or more and 100% or less.

第一のインキで形成した第一の印刷要素(4)及び第二のインキで形成した第二の印刷要素(5)は、反射光で観察した際には等色に観察される特性を有し、且つ、光の透過率が異なることを特徴とする。   The first printing element (4) formed with the first ink and the second printing element (5) formed with the second ink have characteristics that are observed in the same color when observed with reflected light. And the light transmittance is different.

以下に、第一のインキで形成した第一の印刷要素(4)及び第二のインキで形成した第二の印刷要素(5)における分光反射率及び分光透過率について説明する。分光反射率及び分光透過率を測定するためのサンプルは、基材(2)として肌色の上質紙を使用し、第一のインキ及び第二のインキを100%のベタ印刷を行なったものとする。また、分光反射率及び分光透過率の測定には、foster+freeman社製VSC5000を使用する。   Below, the spectral reflectance and spectral transmittance in the 1st printing element (4) formed with the 1st ink and the 2nd printing element (5) formed with the 2nd ink are demonstrated. The sample for measuring the spectral reflectance and the spectral transmittance is obtained by using high-quality skin-colored paper as the base material (2) and performing 100% solid printing of the first ink and the second ink. . Further, a VSC5000 manufactured by foster + freeman is used for the measurement of the spectral reflectance and the spectral transmittance.

ここで、「第一のインキで形成された印刷サンプル」は、「第一の印刷要素」と同義であり、また「第二のインキで形成された印刷サンプル」は、「第二の印刷要素」と同義であることから、以降、基材(2)の上に第一のインキで形成した印刷サンプルは、「第一の印刷要素」と記載し、基材(2)の上に第二のインキで形成した印刷サンプルは、「第二の印刷要素」と記載する。   Here, the “print sample formed with the first ink” is synonymous with the “first print element”, and the “print sample formed with the second ink” is the “second print element”. In the following, the print sample formed with the first ink on the substrate (2) will be referred to as “first printing element” and the second sample on the substrate (2). The print sample formed with the ink of is described as “second printing element”.

図3に、第一の印刷要素(4)の分光反射率(6R)、第二の印刷要素(5)の分光反射率(7R)及び基材(2)の分光反射率(8R)を示す。   FIG. 3 shows the spectral reflectance (6R) of the first printing element (4), the spectral reflectance (7R) of the second printing element (5), and the spectral reflectance (8R) of the substrate (2). .

図3のグラフから、第一の印刷要素(4)及び第二の印刷要素(5)の分光反射率曲線は、ほぼ同じであり、基材(2)の上に印刷された第一の印刷要素(4)及び第二の印刷要素(5)は、目視上、ほぼ等色に観察されることがわかる。また、第一の印刷要素(4)及び第二の印刷要素(5)の分光反射率は、基材(2)の分光反射率(8R)と相似であるものの、基材(2)の分光反射率(8R)よりも低いことから、第一の印刷要素(4)及び第二の印刷要素(5)は、基材(2)の色が若干濃くなった色彩として観察者には認識される特徴を有することがわかる。   From the graph of FIG. 3, the spectral reflectance curves of the first printing element (4) and the second printing element (5) are substantially the same, and the first printing printed on the substrate (2). It can be seen that the element (4) and the second printing element (5) are visually observed to be approximately the same color. The spectral reflectances of the first printing element (4) and the second printing element (5) are similar to the spectral reflectance (8R) of the substrate (2), but the spectrum of the substrate (2). Since it is lower than the reflectance (8R), the first printing element (4) and the second printing element (5) are recognized by the observer as colors in which the color of the substrate (2) is slightly darker. It can be seen that it has the following characteristics.

図4に、第一の印刷要素(4)の分光透過率(6T)、第二の印刷要素(5)の分光透過率(7T)及び基材(2)の分光透過率(8T)を示す。   FIG. 4 shows the spectral transmittance (6T) of the first printing element (4), the spectral transmittance (7T) of the second printing element (5), and the spectral transmittance (8T) of the substrate (2). .

図4のグラフから、第一の印刷要素(4)及び第二の印刷要素(5)の分光透過率曲線は、大きく異なっており、基材(2)の上に印刷された第一の印刷要素(4)は、基材(2)の分光透過率(8T)とほぼ同一であり、第二の印刷要素(5)は、分光透過率が10%程度高いことがわかる。分光透過率が高いということは、透過光で観察した際には明るく視認されることを意味する。よって、透過光で観察した際には、第一の印刷要素(4)は、基材(2)と同じ分光透過率となることで不可視となり、第二の印刷要素(5)は、基材(2)や第一の印刷要素(4)と比較して明るく視認される特徴を有することがわかる。   From the graph of FIG. 4, the spectral transmittance curves of the first printing element (4) and the second printing element (5) are greatly different, and the first printing printed on the substrate (2). It can be seen that the element (4) is almost the same as the spectral transmittance (8T) of the substrate (2), and the second printed element (5) has a spectral transmittance about 10% higher. A high spectral transmittance means that the image is viewed brightly when observed with transmitted light. Thus, when observed with transmitted light, the first printing element (4) becomes invisible due to the same spectral transmittance as the substrate (2), and the second printing element (5) It turns out that it has the characteristic visually recognized brightly compared with (2) and the 1st printing element (4).

本発明の潜像印刷物(1)の効果について、説明する。本発明の潜像印刷物(1)を反射光で観察した際、第一のインキで形成された「A」の文字から成る第一の印刷要素(4)と、第二のインキで形成された「B」の文字から成る第二の印刷要素(5)は、ほぼ等色に視認されることから、観察者には、図6(a)に示すように第一の印刷要素(4)と第二の印刷要素(5)が合成された画像である「A」の文字と「B」の文字から成る印刷画像(3)が、基材(2)の色よりもわずかに濃い濃度で観察される。   The effect of the latent image printed material (1) of the present invention will be described. When the latent image print (1) of the present invention was observed with reflected light, it was formed with the first printing element (4) consisting of the letter "A" formed with the first ink and the second ink. Since the second printing element (5) composed of the letter “B” is visually recognized in almost the same color, the observer can recognize the first printing element (4) and the first printing element (4) as shown in FIG. A print image (3) composed of the letters “A” and “B”, which is an image obtained by combining the second print elements (5), is observed at a slightly darker density than the color of the substrate (2). Is done.

また、本発明の潜像印刷物(1)を透過光で観察した際には、第一のインキで形成された「A」の文字から成る第一の印刷要素(4)は、基材(2)と等色となり、第二のインキで形成された「B」の文字から成る第二の印刷要素(5)は、基材(2)や第一のインキで形成された第一の印刷要素(4)よりも明るく視認されることから、観察者には、図6(b)に示すように「B」の文字から成る第二の印刷要素(5)が、基材(2)よりも明るく観察される。   When the latent image printed matter (1) of the present invention is observed with transmitted light, the first printing element (4) composed of the letter “A” formed with the first ink is formed on the substrate (2 ) And the second printing element (5) consisting of the letter “B” formed with the second ink is the first printing element formed with the substrate (2) or the first ink. Since it is visually recognized brighter than (4), the second printing element (5) consisting of the letter “B” as shown in FIG. Observed brightly.

以上のように、本発明の潜像印刷物(1)を反射光下で観察した際には、基材(2)よりもわずかに濃い色で図6(a)に示す「A」の文字と「B」の文字から成る印刷画像(3)が観察され、透過光で観察した際には、図6(b)に示す「B」の文字から成る第二の印刷要素(5)が基材(2)よりも明るく観察される。そのことによって、反射光下と透過光下のそれぞれ条件の異なる観察方法において、異なる画像が観察されるため、真偽判別性に優れる。   As described above, when the latent image printed material (1) of the present invention is observed under reflected light, the letter “A” shown in FIG. 6A is slightly darker than the base material (2). When the printed image (3) consisting of the letter “B” is observed and observed with transmitted light, the second printing element (5) consisting of the letter “B” shown in FIG. Observed brighter than (2). As a result, different images are observed in different observation methods under different conditions of reflected light and transmitted light, so that the authenticity discrimination is excellent.

本発明を実施するための形態では、基材(2)として肌色の上質紙を用いたが、基材の色は肌色に限定されるわけではなく、白色の基材であっても、その他の色の基材を用いたとしても良く、透過率100%の透明以外の基材であれば本発明の潜像印刷物を形成することは可能である。ただし、第一のインキは、第一のインキが基材に浸透した場合に反射光で観察される色と、第二のインキが基材に浸透した場合に反射光で観察される色と等色に調色する必要があることから、基材が変わればそれに応じて第一のインキを調色する必要がある。   In the embodiment for carrying out the present invention, skin-quality fine paper was used as the base material (2), but the color of the base material is not limited to the skin color. A colored substrate may be used, and the latent image printed material of the present invention can be formed as long as the substrate has a transmittance of 100% and is not transparent. However, the first ink is the color observed by reflected light when the first ink penetrates the substrate, the color observed by reflected light when the second ink penetrates the substrate, etc. Since it is necessary to adjust the color, if the substrate changes, it is necessary to adjust the first ink accordingly.

まず、第一のインキについて説明する。第一のインキは、第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光反射率と、第二のインキを基材(2)に印刷した場合の第二の印刷要素(5)の分光反射率がほぼ同一であり、且つ、第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光透過率が、第二のインキを基材(2)に印刷した場合の第二の印刷要素(5)の分光透過率より小さくなるように調色する。また、前述したように、透過光下で観察した際、第一の印刷要素(4)が消失したような印象を観察者に与えることは、本発明における潜像印刷物(1)の真偽判別の効果をより一層高める役割を果たすことから、第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光透過率と、基材(2)の分光透過率は、同一となるように形成する。   First, the first ink will be described. The first ink includes the spectral reflectance of the first printing element (4) when the first ink is printed on the substrate (2), and the case where the second ink is printed on the substrate (2). The spectral reflectance of the second printing element (5) is substantially the same, and the spectral transmittance of the first printing element (4) when the first ink is printed on the substrate (2) is Toning is performed so as to be smaller than the spectral transmittance of the second printing element (5) when the second ink is printed on the substrate (2). Further, as described above, it is possible to determine the authenticity of the latent image printed material (1) according to the present invention by giving the observer the impression that the first printing element (4) has disappeared when observed under transmitted light. In order to further enhance the effect of the above, the spectral transmittance of the first printing element (4) and the spectral transmittance of the substrate (2) when the first ink is printed on the substrate (2). Are formed to be the same.

第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光反射率と、第二のインキを基材(2)に印刷した場合の第二の印刷要素(5)の分光反射率がほぼ同一にするのは、本発明の潜像印刷物(1)を反射光下で観察した際、第一の印刷要素(4)と第二の印刷要素(5)が合成した画像として等色で観察されるようにするためである。もし、分光反射率が異なる場合、本発明の潜像印刷物(1)を反射光下で観察した際、第一の印刷要素(4)と第二の印刷要素(5)で濃度差が生じ、違和感の有る合成画像となるためである。   Spectral reflectance of the first printing element (4) when the first ink is printed on the substrate (2), and second printing element when the second ink is printed on the substrate (2) ( The spectral reflectance of 5) is made substantially the same when the latent image print (1) of the present invention is observed under reflected light when the first printing element (4) and the second printing element (5) This is so that the synthesized image can be observed in the same color. If the spectral reflectance is different, when the latent image print (1) of the present invention is observed under reflected light, a difference in density occurs between the first print element (4) and the second print element (5). This is because the composite image has a sense of incongruity.

また、第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光透過率が、第二のインキを基材(2)に印刷した場合の第二の印刷要素(5)の分光透過率より小さくなるようにし、第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)の分光透過率と、基材(2)の分光透過率をほぼ同一にするのは、本発明の潜像印刷物(1)を透過光下で観察した際、第一の印刷要素(4)が基材(2)と等色となり、第二の印刷要素(5)が基材(2)や第一のインキで形成された第一の印刷要素(4)よりも明るく観察されるようにするためである。もし、第一の印刷要素(4)と第二の印刷要素(5)の分光透過率が同一である場合、本発明の潜像印刷物(1)を透過光下で観察した際、第一の印刷要素(4)も第二の印刷要素(5)も両方とも観察されてしまう。また、第一の印刷要素(4)と基材(2)が等色でない場合も同様、本発明の潜像印刷物(1)を透過光下で観察した際、第一の印刷要素(4)も第二の印刷要素(5)も両方とも観察されてしまう。   Moreover, when the first ink is printed on the substrate (2), the spectral transmittance of the first printing element (4) is the second printing when the second ink is printed on the substrate (2). The spectral transmittance of the first printing element (4) when the first ink is printed on the base material (2) and the spectral transmittance of the base material (2) are made smaller than the spectral transmittance of the element (5). The reason why the transmittance is almost the same is that when the latent image print (1) of the present invention is observed under transmitted light, the first printing element (4) becomes the same color as the substrate (2), and the second This is because the printing element (5) is observed brighter than the substrate (2) and the first printing element (4) formed with the first ink. If the spectral transmittances of the first printing element (4) and the second printing element (5) are the same, when the latent image print (1) of the present invention is observed under transmitted light, Both the printing element (4) and the second printing element (5) are observed. Similarly, when the first printing element (4) and the substrate (2) are not of the same color, the first printing element (4) is observed when the latent image print (1) of the present invention is observed under transmitted light. Both the second printing element (5) will be observed.

第一のインキを基材(2)に印刷した場合の第一の印刷要素(4)と、第二のインキを基材(2)に印刷した場合の第二の印刷要素(5)の分光透過率の差異については、目視上容易に真偽判別を行うことを目的とすると、可視光である400nmから700nmの波長域における第二の印刷要素(5)の透過スペクトルの積分値が、第一の印刷要素(4)の透過スペクトルの積分値の120%以上を有することとする。透過スペクトルの積分値は、図5(a)の斜線部分で示す第一の印刷要素(4)の分光透過率(6T)の面積率に対し、図5(b)の斜線部分で示す第二の印刷要素(5)の分光透過率(7T)の面積率の割合で表される。なお、第一の印刷要素(4)と第二の印刷要素(5)は、階調表現をすることも可能であり、その場合、第二の印刷要素(5)の透過スペクトルの積分値については、特に限定されない。   Spectroscopy of the first printing element (4) when the first ink is printed on the substrate (2) and the second printing element (5) when the second ink is printed on the substrate (2) With respect to the difference in transmittance, for the purpose of easily determining authenticity visually, the integral value of the transmission spectrum of the second printing element (5) in the wavelength range of 400 nm to 700 nm, which is visible light, is It shall have 120% or more of the integral value of the transmission spectrum of one printing element (4). The integral value of the transmission spectrum is the second value indicated by the shaded portion in FIG. 5B with respect to the area ratio of the spectral transmittance (6T) of the first printing element (4) indicated by the shaded portion in FIG. The area ratio of the spectral transmittance (7T) of the printing element (5). Note that the first printing element (4) and the second printing element (5) can also express gradation, and in that case, the integrated value of the transmission spectrum of the second printing element (5). Is not particularly limited.

これは、第二の印刷要素(5)の透過スペクトルの積分値が、第一の印刷要素(4)の透過スペクトルの積分値の120%より小さい場合、本発明の潜像印刷物(1)を透過光下で観察した際、十分なコントラストが生じず視認性が悪くなるためである。また、第二の印刷要素(5)の透過スペクトルの積分値の上限については、大きければ大きいほど本発明の潜像印刷物(1)を透過光下で観察した際の視認性が良くなるため好ましい。ただし、物理的に形成可能な積分値の上限値があり、その上限値は、第一の印刷要素(4)の分光透過率と基材(2)の分光透過率によって決定される。   This is because when the integral value of the transmission spectrum of the second printing element (5) is smaller than 120% of the integral value of the transmission spectrum of the first printing element (4), the latent image print (1) of the present invention is reduced. This is because, when observed under transmitted light, sufficient contrast does not occur and visibility deteriorates. Further, the upper limit of the integral value of the transmission spectrum of the second printing element (5) is preferably as it is larger because the visibility when the latent image print (1) of the present invention is observed under transmitted light is improved. . However, there is an upper limit value of an integral value that can be physically formed, and the upper limit value is determined by the spectral transmittance of the first printing element (4) and the spectral transmittance of the substrate (2).

次に、第二のインキについて説明する。第二のインキは、浸透型のインキを用いれば良い。透明や半透明と称して販売されているインキであっても、適正な印刷膜厚で基材上に形成した場合には、印刷した部分は油染みのように基材より濃い色で可視化されることから、本発明に必要な反射光下で可視画像を形成する特性を有している。第二のインキに望まれる特性としては、印刷時に基材に充分浸透して印刷領域の分光透過率が上がること、インキ自体は透明に近いかあるいは半透明であること、経時による色の変化が小さいこと、滲みが少ないこと等がある。これらの特性を満たしていれば、浸透型インキとして販売されている以外のインキを用いても何ら問題ない。   Next, the second ink will be described. For the second ink, a penetrating ink may be used. Even if the ink is marketed as transparent or translucent, when it is formed on the base material with an appropriate printed film thickness, the printed part is visualized in a darker color than the base material like oil stains. Therefore, it has the characteristic of forming a visible image under the reflected light necessary for the present invention. The desired properties of the second ink are that it penetrates the substrate sufficiently during printing and the spectral transmittance of the printing area increases, the ink itself is nearly transparent or translucent, and the color changes over time. It is small and has little bleeding. If these characteristics are satisfied, there is no problem even if an ink other than those sold as penetrating ink is used.

また、第二のインキは、微量の着色顔料を加えて着色半透明化しても良い。この場合、デザイン上の自由度が向上するが、過剰に着色した場合には、如何に浸透性に優れたインキであっても分光透過率が低下することから注意が必要であり、その都度、着色顔料の適当な配合割合を見極める必要がある。この場合、第二のインキと等色に仕上げるために第一のインキも同様に着色する必要がある。   The second ink may be made translucent by adding a small amount of a color pigment. In this case, the degree of freedom in design is improved, but if it is excessively colored, care should be taken because the spectral transmittance will be lowered even if the ink has excellent permeability. It is necessary to determine an appropriate blending ratio of the color pigment. In this case, in order to finish the same color as the second ink, it is necessary to color the first ink as well.

また、第一のインキ及び第二のインキに、機能性材料を混合して特殊な認証機能を付与しても良い。例えば、いずれかのインキに発光顔料を混合して、ブラックライト照射時にいずれかの印刷要素が発光する特性を付与したり、赤外線吸収材料を混合して赤外線による認証機能を付与したりすることが可能である。その他にも、燐光顔料、蓄光顔料、フォトクロミック顔料、示温材料、サーモクロミック材料等が挙げられる。   Moreover, a functional material may be mixed with the first ink and the second ink to give a special authentication function. For example, a luminescent pigment may be mixed with any ink to impart the characteristic that any printing element emits light when irradiated with black light, or an infrared absorbing material may be mixed to provide an infrared authentication function. Is possible. In addition, phosphorescent pigments, phosphorescent pigments, photochromic pigments, temperature indicating materials, thermochromic materials, and the like can be given.

本発明における潜像印刷物の印刷方式は、オフセット印刷、フレキソ印刷、凸版印刷、グラビア印刷、スクリーン印刷、凹版印刷等、あらゆる印刷方式で形成することが可能である。また、浸透性の高いインクを用いることが可能であればIJP等でも形成でき、この場合には、一枚、一枚の出力物の情報を変える、いわゆる可変印刷を実施することができる。   The printing method of the latent image printed material in the present invention can be formed by any printing method such as offset printing, flexographic printing, letterpress printing, gravure printing, screen printing, and intaglio printing. In addition, if it is possible to use highly penetrable ink, it can be formed by IJP or the like. In this case, so-called variable printing can be performed in which information of one output item is changed.

以下、前述の発明を実施するための形態にしたがって、具体的に作製した潜像印刷物の実施例について詳細に説明するが、本発明は、この実施例に限定されるものではない。   Hereinafter, examples of the latent image printed matter produced in detail will be described in accordance with the above-described mode for carrying out the invention, but the present invention is not limited to these examples.

本発明の実施例1について、図7から図9を用いて説明をする。図7は、本発明の潜像印刷物(1)を示す図であり、基材(2)として、肌色の上質紙(紀州製紙株式会社製)を使用し、基材(2)の上に「鳳凰(商標登録番号第3042101号)」の図柄を成す印刷画像(3)が印刷されている。「鳳凰」の図柄を成す印刷画像(3)は、図8(a)に示す「鳳凰」の図柄の一部から成る第一の印刷要素(4)と、図8(b)に示す第一の印刷要素(4)以外の「鳳凰」の図柄の一部から成る第二の印刷要素(5)を合成することで構成される。   A first embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a diagram showing the latent image printed material (1) of the present invention. As the base material (2), a skin-colored high-quality paper (manufactured by Kishu Paper Co., Ltd.) is used. A print image (3) having a design of “鳳凰 (trademark registration number 3042101)” is printed. The print image (3) forming the symbol “鳳凰” has a first printing element (4) composed of a part of the symbol “鳳凰” shown in FIG. 8A and a first image shown in FIG. 8B. The second printing element (5) composed of a part of the symbol “鳳凰” other than the printing element (4) is synthesized.

第一の印刷要素(4)は、表1に示す配合の第一のインキを使用して網点面積率100%のベタ画像としてオフセット印刷方式で形成し、第二の印刷要素(5)は、第二のインキである帝国インキ製造株式会社製ユニマークを使用して、網点面積率100%のベタ画像としてオフセット印刷方式で形成した。肌色の上質紙に第一のインキと第二のインキを形成した際、同じ色となるように、第一のインキに着色顔料を混合することで調色を行なっている。   The first printing element (4) is formed by the offset printing method as a solid image having a dot area ratio of 100% using the first ink having the composition shown in Table 1, and the second printing element (5) Using a second ink, Teikoku Manufacturing Co., Ltd. Unimark, a solid image having a dot area ratio of 100% was formed by the offset printing method. Toning is performed by mixing a color pigment with the first ink so that when the first ink and the second ink are formed on high-quality paper of skin color, the same color is obtained.

Figure 2011037234
Figure 2011037234

第一の印刷要素(4)の分光反射率は図3のグラフの曲線(6R)に示す通りであり、第二の印刷要素(5)の分光反射率は図3のグラフの曲線(7R)に示す通りである。また、用紙の分光反射率は図3のグラフの曲線(8R)に示す通りである。図3のグラフから、第一の印刷要素と第二の印刷要素の分光反射率曲線はほぼ同じであり、肌色の用紙である基材(2)上で二つの印刷要素は、ほぼ等色に観察されることがわかる。また、それぞれの印刷要素の分光反射率は用紙の分光反射率(8R)と相似であるものの、用紙の分光反射率(8R)よりも低いことから、それぞれの印刷要素の色は、基材(2)である用紙の色が若干濃くなったような色彩として観察者には認識される。   The spectral reflectance of the first printing element (4) is as shown in the curve (6R) of the graph of FIG. 3, and the spectral reflectance of the second printing element (5) is the curve (7R) of the graph of FIG. As shown in The spectral reflectance of the paper is as shown by the curve (8R) in the graph of FIG. From the graph of FIG. 3, the spectral reflectance curves of the first printing element and the second printing element are substantially the same, and the two printing elements on the substrate (2), which is a flesh-colored paper, are substantially the same color. It can be seen that it is observed. In addition, although the spectral reflectance of each printing element is similar to the spectral reflectance (8R) of the paper, it is lower than the spectral reflectance (8R) of the paper. 2) is recognized by the observer as a color in which the color of the paper is slightly darker.

また、第一の印刷要素(4)の分光透過率は図4のグラフの曲線(6T)に示す通りであり、第二の印刷要素(5)の分光透過率は図4のグラフの曲線(7T)に示す通りである。また、用紙の分光透過率は図4のグラフの曲線(8T)に示す通りである。第一の印刷要素と第二の印刷要素の分光透過率曲線は大きく異なっており、肌色の用紙である基材(2)上に印刷された第一の印刷要素は、用紙の分光透過率(8T)とほぼ同じであるのに対して、第二の印刷要素は10%程度透過率が高いことがわかる。透過スペクトルの積分値で見ると、150%以上有していると言える。よって、透過光で観察した際には、第一の印刷要素は用紙と同じ分光透過率となることで不可視となるのに対して、第二の印刷要素は用紙や第一の印刷要素と比較して明るく視認される。   The spectral transmittance of the first printing element (4) is as shown in the curve (6T) of the graph of FIG. 4, and the spectral transmittance of the second printing element (5) is the curve of the graph of FIG. 7T). The spectral transmittance of the paper is as shown by the curve (8T) in the graph of FIG. The spectral transmittance curves of the first printing element and the second printing element are greatly different, and the first printing element printed on the substrate (2), which is a flesh-colored paper, has a spectral transmittance ( 8T), the second printing element has a high transmittance of about 10%. From the integral value of the transmission spectrum, it can be said that it has 150% or more. Thus, when viewed with transmitted light, the first print element is invisible due to the same spectral transmittance as the paper, whereas the second print element is incomparable with the paper and the first print element. And brightly visible.

本発明の実施例1における効果について記載する。本発明の潜像印刷物(1)を反射光で観察した際には、第一のインキで形成された「鳳凰」の図柄の一部から成る第一の印刷要素(4)と、第二のインキで形成された第二の印刷要素(5)である第一の印刷要素以外の「鳳凰」の図柄の一部は、ほぼ等色に視認されることから、観察者には図9(a)に示すように第一の印刷要素(4)と第二の印刷要素(5)の合成画像である印刷画像(3)である「鳳凰」の図柄が、基材(2)である用紙の色よりもわずかに濃い濃度で観察される。   The effect in Example 1 of this invention is described. When the latent image printed material (1) of the present invention is observed with reflected light, the first printing element (4) comprising a part of the “鳳凰” pattern formed with the first ink, and the second printing Since a part of the design of the “鳳凰” other than the first printing element which is the second printing element (5) formed of ink is visually recognized to be almost the same color, the observer sees FIG. ), The pattern of “鳳凰”, which is the print image (3), which is a composite image of the first print element (4) and the second print element (5), Observed at a density slightly darker than the color.

また、本発明の潜像印刷物(1)を透過光で観察した際には、第一のインキで形成された「鳳凰」の図柄の一部から成る第一の印刷要素(4)は、用紙である基材(2)と等色となり、第二のインキで形成された第一の印刷要素(4)以外の「鳳凰」の図柄の一部から成る第二の印刷要素(5)は、用紙である基材(2)や第一のインキで形成された第一の印刷要素(4)よりも明るく視認されることから、観察者には図9(b)に示すように「鳳凰」の図柄の一部から成る第二の印刷要素(5)が、基材(2)よりも明るく観察される。   Further, when the latent image printed matter (1) of the present invention is observed with transmitted light, the first printing element (4) consisting of a part of the “鳳凰” pattern formed with the first ink is a sheet of paper. The second printing element (5), which is the same color as the base material (2) and is made up of a part of the “鳳凰” pattern other than the first printing element (4) formed of the second ink, Since it is viewed brighter than the base material (2), which is paper, and the first printing element (4) formed with the first ink, the observer sees “鳳凰” as shown in FIG. The second printing element (5) consisting of a part of the pattern is observed brighter than the substrate (2).

以上のように、本発明の潜像印刷物(1)を反射光下で観察した際には、用紙よりもわずかに濃い色で図9(a)に示す「鳳凰」の図柄から成る印刷画像(3)が観察され、透過光で観察した際には、図9(b)に示す「鳳凰」の図柄の一部から成る第二の印刷要素(5)が基材(2)よりも明るく観察される。よって、反射光と透過光とのそれぞれ条件の異なる観察方法において、異なる画像が観察されることが確認できた。   As described above, when the latent image printed material (1) of the present invention is observed under reflected light, a printed image (“鳳凰” shown in FIG. 9A in a slightly darker color than the paper) 3) is observed, and when observed with transmitted light, the second printed element (5) consisting of a part of the symbol “鳳凰” shown in FIG. 9B is observed brighter than the base material (2). Is done. Therefore, it has been confirmed that different images are observed in the observation methods in which the reflected light and the transmitted light have different conditions.

本発明の実施例2について図10から図12を用いて説明をする。図10は本発明の潜像印刷物(1´)を示す図であり、一般的な白い色の上質紙(日本製紙株式会社製)を基材(2´)とし、直径0.5mmの小さなドットが0.75mm間隔で上下左右に連続して配された領域と「secure」のアルファベットが複数並んだ領域から成る印刷画像(3´)が印刷されている。印刷画像(3´)は、図11(a)に示す小さなドットが連続して配された領域の一部から「OK」の文字が切り抜かれた領域から成る第一の印刷要素(4´)と、図11(b)に示す小さなドットが連続して配された領域の一部から「OK」の文字を切り抜いた領域と「secure」のアルファベットが複数並んだ領域から成る第二の印刷要素(5´)を合成することで構成される。   A second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a diagram showing a latent image printed material (1 ′) according to the present invention, in which a fine white paper (manufactured by Nippon Paper Industries Co., Ltd.) is used as a base material (2 ′), a small dot having a diameter of 0.5 mm. Is printed with a print image (3 ′) consisting of a region continuously arranged vertically and horizontally at intervals of 0.75 mm and a region where a plurality of alphabets of “secure” are arranged. The print image (3 ′) includes a first print element (4 ′) including a region in which characters “OK” are cut out from a part of a region in which small dots illustrated in FIG. And a second printing element composed of a region in which characters “OK” are cut out from a part of a region in which small dots shown in FIG. 11B are continuously arranged and a plurality of alphabets “secure” are arranged. (5 ') is composed.

第一の印刷要素(4´)は、表2に示す配合の第一のインキを使用して網点面積率100%のベタ画像としてオフセット印刷方式で形成し、第二の印刷要素(5´)は、第二のインキである帝国インキ製造株式会社製ユニマークを使用して、網点面積率100%のベタ画像としてオフセット印刷方式で形成した。白色の上質紙に第一のインキと第二のインキを形成した際、同じ色となるように、第一のインキに着色顔料を混合することで調色を行なっている。   The first printing element (4 ′) is formed by the offset printing method as a solid image having a dot area ratio of 100% using the first ink having the composition shown in Table 2, and the second printing element (5 ′ ) Was formed by the offset printing method as a solid image with a dot area ratio of 100%, using Unimark manufactured by Teikoku Mfg. Co., Ltd. as the second ink. Toning is performed by mixing a color pigment with the first ink so that when the first ink and the second ink are formed on white fine paper, the same color is obtained.

Figure 2011037234
Figure 2011037234

第一の印刷要素(4´)と第二の印刷要素(5´)は、反射光下では等色に観察され、その色は、基材の色である白色よりもわずかに暗い灰色として視認される。また、第一の印刷要素(4´)と比較して第二の印刷要素(5´)は、光の分光透過率が高い特性を有している。また、第一の印刷要素(4´)と基材(2´)の分光透過率は、ほぼ同じである。   The first printing element (4 ') and the second printing element (5') are observed to be the same color under reflected light, and the color is visible as a slightly darker gray than the white color of the substrate. Is done. Further, the second printing element (5 ′) has a characteristic that the spectral transmittance of light is higher than that of the first printing element (4 ′). The spectral transmittance of the first printing element (4 ′) and the base material (2 ′) is substantially the same.

本発明の実施例2における効果について記載する。本発明の潜像印刷物(1´)を反射光で観察した際には、第一のインキで形成された小さなドットが連続して配された領域の一部から「OK」の文字が切り抜かれた領域から成る第一の印刷要素(4´)と、第二のインキで形成された小さなドットが連続して配された領域の一部から「OK」の文字を切り抜いた領域と「secure」のアルファベットが複数並んだ領域から成る第二の印刷要素(5´)は、ほぼ等色に視認されることから、観察者には、図12(a)に示すように第一の印刷要素(4´)と第二の印刷要素(5´)の合成画像である小さなドットが連続して配された領域と「secure」のアルファベットが複数並んだ領域から成る印刷画像(3´)が、基材(2´)である用紙の色よりもわずかに濃い濃度で観察される。   The effect in Example 2 of this invention is described. When the latent image printed material (1 ') of the present invention is observed with reflected light, the characters "OK" are cut out from a part of the region where the small dots formed with the first ink are continuously arranged. A region where the first printing element (4 ') consisting of a region and a small dot formed with the second ink are continuously arranged and a portion "OK" is cut out from a part of the region Since the second printing element (5 ') consisting of a region where a plurality of alphabets are arranged is visually recognized in almost the same color, the first printing element (as shown in FIG. 4 ′) and the second print element (5 ′), a print image (3 ′) composed of a region in which small dots are continuously arranged and a region in which a plurality of “secure” alphabets are arranged. A density slightly higher than the color of the paper (2 ') is observed.

また、本発明の潜像印刷物(1´)を透過光で観察した際には、第一のインキで形成された小さなドットが連続して配された領域の一部から「OK」の文字が切り抜かれた領域から成る第一の印刷要素(4´)は、用紙である基材(2´)と等色となり、第二のインキで形成された小さなドットが連続して配された領域の一部から「OK」の文字を切り抜いた領域と「secure」のアルファベットが複数並んだ領域から成る第二の印刷要素(5´)は、用紙である基材(2´)や第一のインキで形成された第一の印刷要素(4´)よりも明るく視認されることから、観察者には、図12(b)に示すように小さなドットが連続して配された領域の一部から「OK」の文字を切り抜いた領域と「secure」のアルファベットが複数並んだ領域から成る第二の印刷要素(5´)が、基材(2´)よりも明るく観察される。   In addition, when the latent image printed material (1 ′) of the present invention is observed with transmitted light, the letters “OK” appear from a part of the area where small dots formed with the first ink are continuously arranged. The first printing element (4 ′) composed of the cut-out area is the same color as the base material (2 ′) which is the paper, and is the area where the small dots formed with the second ink are continuously arranged. The second printing element (5 ′) consisting of a region where “OK” is partially cut out and a region where a plurality of “secure” alphabets are lined up is a base material (2 ′) which is paper and the first ink. As shown in FIG. 12 (b), the observer can see from a part of the area where small dots are continuously arranged. The area where the characters “OK” are cut out and the alphabet of “secure” are arranged side by side Second printing element consisting of (5 ') is observed more brightly than the substrate (2').

以上のように、本発明の潜像印刷物(1´)を反射光下で観察した際には、用紙よりもわずかに濃い色で図12(a)に示す小さなドットが連続して配された領域と「secure」のアルファベットが複数並んだ領域から成る印刷画像(3´)が観察され、透過光で観察した際には、図12(b)に示す小さなドットが連続して配された領域の一部から「OK」の文字を切り抜いた領域と「secure」のアルファベットが複数並んだ領域から成る第二の印刷要素(5´)が基材(2´)よりも明るく観察される。よって、反射光下と透過光下とのそれぞれ条件の異なる観察方法において、異なる画像が観察されることが確認できた。   As described above, when the latent image print (1 ′) of the present invention was observed under reflected light, the small dots shown in FIG. 12A were continuously arranged in a slightly darker color than the paper. When a printed image (3 ′) composed of a region and a region where a plurality of “secure” alphabets are arranged is observed and observed with transmitted light, a region in which small dots shown in FIG. A second printing element (5 ′) consisting of a region where “OK” is cut out from a part of the region and a region where a plurality of “secure” alphabets are arranged is observed brighter than the substrate (2 ′). Therefore, it was confirmed that different images were observed in the observation methods under different conditions for reflected light and transmitted light.

1、1´ 潜像印刷物
2、2´ 基材
3、3´ 印刷画像
4、4´ 第一の印刷要素
5、5´ 第二の印刷要素
6R 第一の印刷要素の分光反射率曲線
7R 第二の印刷要素の分光反射率曲線
8R 基材の分光反射率曲線
6T 第一の印刷要素の分光透過率曲線
7T 第二の印刷要素の分光透過率曲線
8T 基材の分光透過率曲線
1, 1 'latent image printed matter 2, 2' substrate 3, 3 'printed image 4, 4' first printing element 5, 5 'second printing element 6R spectral reflectance curve 7R of first printing element Spectral reflectance curve 8R of the second printing element Spectral reflectance curve 6T of the base material Spectral transmittance curve 7T of the first printing element Spectral transmittance curve 8T of the second printing element Spectral transmittance curve of the base material

Claims (5)

基材上の少なくとも一部に、前記基材と異なる色の印刷画像が形成されて成る潜像印刷物において、
前記印刷画像は、第一のインキで形成された第一の印刷要素と第二のインキで形成された第二の印刷要素から構成され、
前記第一の印刷要素の分光反射率と、前記第二の印刷要素の分光反射率は、等しい分光反射率を有するとともに、前記第一の印刷要素の分光反射率及び前記第二の印刷要素の分光反射率は、前記基材の分光反射率より低い分光反射率を有し、
前記基材の分光透過率及び前記第一の印刷要素の分光透過率は、前記第二の印刷要素の分光透過率より低い分光透過率を有し、
反射光下で観察した場合は、前記印刷画像が視認され、透過光下で観察した場合には、前記第二の印刷要素が視認されることを特徴とする潜像印刷物。
In a latent image printed matter in which a printed image of a color different from that of the substrate is formed on at least a part of the substrate,
The printed image is composed of a first printing element formed with a first ink and a second printing element formed with a second ink;
The spectral reflectance of the first printing element and the spectral reflectance of the second printing element have the same spectral reflectance, and the spectral reflectance of the first printing element and the second printing element Spectral reflectance has a spectral reflectance lower than the spectral reflectance of the substrate,
The spectral transmittance of the substrate and the spectral transmittance of the first printing element have a spectral transmittance lower than the spectral transmittance of the second printing element,
A latent image print, wherein the printed image is visually recognized when observed under reflected light, and the second printed element is visually observed when observed under transmitted light.
400nmから700nmの波長域において、前記第二の印刷要素における透過スペクトルの積分値が、前記第一の印刷要素における透過スペクトルの積分値の120%以上を有することを特徴とする請求項1記載の潜像印刷物。   The integrated value of the transmission spectrum in the second printing element in the wavelength region of 400 nm to 700 nm has 120% or more of the integrated value of the transmission spectrum in the first printing element. Latent image printed matter. 前記基材の分光透過率と、前記第一の印刷要素の分光透過率は、等しい分光透過率を有することを特徴とする請求項1又は2記載の潜像印刷物。   The latent image print according to claim 1, wherein the spectral transmittance of the substrate and the spectral transmittance of the first printing element have the same spectral transmittance. 前記第一の印刷要素の面積率と前記第二の印刷要素の面積率は、50%以上100%以下で形成されることを特徴とする請求項1乃至3のいずれか一項記載の潜像印刷物。   4. The latent image according to claim 1, wherein an area ratio of the first printing element and an area ratio of the second printing element are 50% or more and 100% or less. 5. Printed matter. 前記第一のインキ及び前記第二のインキは、機能性材料を混合して成ることを特徴とする請求項1乃至4のいずれか一項記載の潜像印刷物。   The latent image printed matter according to any one of claims 1 to 4, wherein the first ink and the second ink are mixed with a functional material.
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JP2011143669A (en) * 2010-01-18 2011-07-28 National Printing Bureau Latent image printed matter
JP2013119247A (en) * 2011-12-09 2013-06-17 National Printing Bureau Latent image printed matter
JP2014046659A (en) * 2012-09-04 2014-03-17 National Printing Bureau Printed matter for discrimination of authenticity
JP2014051073A (en) * 2012-09-10 2014-03-20 National Printing Bureau Printed matter capable of authenticity discrimination
JP2014073636A (en) * 2012-10-04 2014-04-24 National Printing Bureau Copy check printed matter
JP2016052751A (en) * 2014-09-04 2016-04-14 独立行政法人 国立印刷局 Anti-counterfeit printed matter
JP2016203460A (en) * 2015-04-21 2016-12-08 独立行政法人 国立印刷局 Transmissive pattern printed matter
JP2016210147A (en) * 2015-05-13 2016-12-15 独立行政法人 国立印刷局 Special latent image pattern formed body

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JP2008188974A (en) * 2007-02-08 2008-08-21 National Printing Bureau Image forming body

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011143669A (en) * 2010-01-18 2011-07-28 National Printing Bureau Latent image printed matter
JP2013119247A (en) * 2011-12-09 2013-06-17 National Printing Bureau Latent image printed matter
JP2014046659A (en) * 2012-09-04 2014-03-17 National Printing Bureau Printed matter for discrimination of authenticity
JP2014051073A (en) * 2012-09-10 2014-03-20 National Printing Bureau Printed matter capable of authenticity discrimination
JP2014073636A (en) * 2012-10-04 2014-04-24 National Printing Bureau Copy check printed matter
JP2016052751A (en) * 2014-09-04 2016-04-14 独立行政法人 国立印刷局 Anti-counterfeit printed matter
JP2016203460A (en) * 2015-04-21 2016-12-08 独立行政法人 国立印刷局 Transmissive pattern printed matter
JP2016210147A (en) * 2015-05-13 2016-12-15 独立行政法人 国立印刷局 Special latent image pattern formed body

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