JP3350806B2 - Printed matter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter in which an image which cannot be viewed is rubbed with a coin or the like so that the image can be viewed.

[0002]

2. Description of the Related Art A concealing layer made of silver ink is provided on the surface of a printed matter formed on a base material at a speed lottery or the like in which a hit can be confirmed on the spot, and the printed matter is concealed and made invisible. Printed matter is widely used.

In this printed matter, an image showing a predetermined pattern or pattern such as characters is printed on a base material such as paper, and a concealing layer of silver ink which conceals this image to make it invisible is printed on the printed layer. The image is concealed by being provided, and the concealing layer is scraped off with a nail, a coin, or the like during use to expose the image.

However, in the case of a printed material provided with a concealing layer of a peelable silver ink on a printing layer, in order to secure concealing properties, a large amount of a metal powder such as aluminum is dispersed and a large concealing layer is used. Need to have layers,
The printing method is limited to the silk screen printing method, which is disadvantageous in production efficiency. In addition, there is also a hygienic inconvenience that shavings are generated when the silver ink concealing layer is scraped off during use.

[0005] In addition, when a coin is rubbed, a printed matter on which an image which cannot be visually recognized appears, for example, as disclosed in Japanese Patent Publication No. 6-7 / 1994.
No. 8039, this printed matter is printed on a predetermined image with an ink containing a material having a higher hardness than the metal of the coin, and by rubbing the coin on the image portion, the metal shaved from the coin Are attached to the image portion and colored, so that the image can be visually recognized by the streaks.

However, when a hidden image is formed by using an ink containing a material having a higher hardness than the metal of a coin, a high-hardness white pigment such as titanium oxide, aluminum oxide, silicon dioxide, and chromium oxide is used. The ink used as the material is used to print on a white base material such as paper.
When any of the materials is used, there is a problem that a printed hidden image can be easily visually recognized due to a difference in whiteness between the pigment and the printing substrate. Furthermore, since the hidden image visualized on the ink using a material higher in hardness than the metal of the coin as the pigment can be made invisible again by rubbing an eraser, a silver ink widely used is used. It was not a substitute for the printed material used.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a conventional printed matter which is made visible by rubbing an invisible image with a coin or the like. The present invention provides a printed material that can be easily printed by various printing methods and has high concealment.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for forming hidden images on a substrate by using an ink containing a pigment having a higher hardness than coins, and forming the surfaces of the images, that is, the surfaces of the substrate and the hidden image. Further, a pattern layer is provided so that the hidden image cannot be visually recognized.

The pattern layer is formed of a resin having a hardness lower than that of a coin, and has a finely intricate pattern of an image forming portion for concealing the surface of the hidden image and a non-image forming portion for exposing the surface. This makes the hidden image invisible.

[0010] When the surface of the printed matter is rubbed by coins or the like, the image forming portion of the pattern layer and the non-image forming portion on which the hidden image is not printed are not visualized but provided on the hidden image. Non-image components in the pattern layer
It is visualized by the streaks that result when the coins are shaved.

In the case where the pattern layer is formed with the disappearing ink, if the eraser is used to erase the streaks of the visualized hidden image, it is clear that not only the hidden image but also the pattern layer has been erased and falsified. Becomes Therefore, it is impossible to falsify the information once visualized.

Further, when the concealing layer is provided at the position of the hidden image on the back surface of the base material, there is no fear that the hidden image can be seen through from the back surface, and the information concealing property is further enhanced.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the surface of a white base material 3 such as paper is hidden by a white ink having a hardness higher than a coin, for example, using titanium oxide or the like as a main component of a pigment. Image 1 is printed. Then, on these surfaces, that is, on the base material 3 and the hidden image 1, using a light-colored vanishing ink having a hardness lower than that of a coin, the image forming part and the non-image forming part are finely intricate, such as a line. Number 130
The pattern layer 2 consisting of halftone dots having a line / inch and a halftone dot area ratio of about 30% is superposed and printed. The pattern layer 2 is not limited to the screen pattern, and may be formed with a fine copy-forgery-inhibited pattern or the like. The area ratio between the image forming portion and the non-image forming portion is preferably in a range of approximately 5% to 50%.

Further, a concealing layer 4 made of high-density ink, such as a dark ink, is provided at the position of the hidden image 1 on the back surface of the base material 3 in order to improve the concealment of the watermark. It is also effective to print a pattern similar to the pattern layer 2 as the concealing layer 4.

In the printed matter thus obtained, the concealing property is improved by the superposition of the hidden image 1 and the pattern layer 2, and the hidden image 1 becomes invisible. Further, when rubbed by a coin or the like, as shown in FIG. 3, the image forming unit 21 is not visualized in the pattern layer 2 provided on the hidden image 1, but in the portion of the non-image forming unit 22. , Hidden image 1
The coins are shaved by the pigment having a higher hardness than the coins forming the streaks, streaks are generated, and the hidden image 1 can be visually recognized.

Further, by forming the pattern layer 2 with the disappearing ink, if the image once visualized is rubbed with an eraser or the like, not only the streak of the hidden image 1 but also the pattern layer printed with the disappearing ink is obtained. Since 2 is also deleted, it becomes clear that the data has been tampered with, and a function of preventing tampering can be added.

The printing of the hidden image 1 and the pattern layer 2 is as follows.
It is possible to use various methods such as offset printing, letterpress printing, gravure printing, flexographic printing, silk screen printing, and the like.

FIG. 4 shows an example in which the printed matter according to the present invention is used for securities, and the method of forming the hidden image 5 and the pattern layer 6 is the same as that described above.

In this printed matter, the hidden image 5 becomes invisible and, when copying is performed by a copying machine, other images of the form 7 are copied, but the hidden image 5 is not copied. Further, the hidden image 5 is similar to the above-described printed matter shown in FIG.
When rubbed by coins or the like, streaks are generated in the non-image components in the pattern layer 6 provided on the hidden image 5, so that the hidden image 5 can be visually recognized.

Therefore, the authenticity of the original document and the copy can be determined, and when the pattern layer 6 is formed of ink that cannot be erased by the eraser, the hidden image 5 once visualized is rubbed with the eraser. It can be made invisible again.

When a sufficient concealing effect cannot be obtained with only the pattern layer 6 provided on the front surface, it is effective to provide a concealing layer on the back surface of the hidden image 5.

In printing the hidden image 5 and the pattern layer 6, a wide variety of printing methods can be used as in the above-described embodiment.

[0024]

According to the present invention, a printed matter including a hidden image can be produced by a simple printing method such as offset printing, so that the production efficiency is high and the cost is low.

Moreover, since the information is highly visible and concealable, it can be widely used for lotteries and certificates.

Further, if the pattern layer is formed of an ink which does not erase even if it is rubbed with an eraser, the hidden image once visualized can be made invisible again. Forming with ink has the effect of preventing falsification of the information once visualized.

Furthermore, if a concealing layer is provided at the position of the hidden image on the back surface of the base material, the hidden image will not be visible through the back surface and will be further enhanced in information concealment.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment shown in FIG.

FIG. 3 is an enlarged front view of the hidden image shown in FIG. 1;

FIG. 4 is a front view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hidden image 2 Pattern layer 3 Base material 4 Hiding layer 21 Image constituent part 22 Non-image constituent part

Continuation of the front page (56) References JP-A-9-11678 (JP, A) JP-A-63-15797 (JP, A) JP-A-2-297482 (JP, A) JP-A-7-32780 (JP, A) , A) Japanese Utility Model Application Showa 58-112577 (JP, U) Japanese Utility Model Application Hei 6-42229 (JP, U) Japanese Utility Model Application 1-83582 (JP, U) Japanese Patent Publication No. 6-78039 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41M 3/00 B41M 3/14 B42D 15/10 531

Claims (3)

(57) [Claims] 1. A hidden image is formed on a substrate with an ink containing a pigment having a higher hardness than a coin, and the surface is concealed with an ink made of a material having a lower hardness than the coin on the surface thereof. By providing a pattern layer in which an image forming part and a non-image forming part exposing the surface are intricately formed to make the hidden image invisible and rubbing coins against the pattern layer, the non-image forming part of the pattern layer A printed matter, wherein the hidden image is visually recognized by a streak formed on the hidden image through the printed matter. 2. The printed matter according to claim 1, wherein the pattern layer is formed of a disappearing ink which is erased by rubbing with an eraser. 3. The printed matter according to claim 1, further comprising a concealing layer provided at a position of the concealed image on the back surface of the substrate so that the concealed image cannot be seen through.