JPH08190335A - Pattern printing body by magnetic ink having surface polarization layer - Google Patents

Abstract

PURPOSE: To obtain a printing body having a high-degree authenticity deciding function by providing the surface of a base maternal with a reflection film, providing the surface thereof with a pattern printing layer by magnetic ink consisting of iron garnet based magnetic powder and providing the surface thereof with a surface layer having a polarization characteristic, thereby obtaining both of the authenticity deciding function by viewing with the human eyes and an authenticity deciding function by a machine. CONSTITUTION: The surface of the base material 110 is provided with the reflection film 120 and the film is provided thereon with the pattern printing layer 130 by the magnetic ink consisting of the iron garnet based magnetic powder. This printing layer is provided thereon with the surface layer 140 having the polarization characteristic. The pattern printing layer 130 by the magnetic ink having a magnetooptical effect is detectable by using a means to be utilized for a magneto-optical disk system by the machine or by recording and reproducing the magnetically recorded contents. The visual checking of the magnetic patterns of the pattern printing layer 130 is made possible by the pattern printing layer 130 and the surface layer 140 which is disposed thereon and has polarization and by using an apparatus belonging to ordinary microscopes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern printed material having an anti-counterfeiting effect applied to cards, gift certificates, passports, etc., which can be visually confirmed and does not require polarization, a polarizing plate, etc. The present invention relates to a pattern printed material using magnetic ink.

[0002]

2. Description of the Related Art Magneto-optical recording technology has been developed and used as storage technology for computers. Since recording data can be reproduced using light and contactless reproduction can be performed, it has been proposed as a recording technology for a printed material. The magneto-optical printing material proposed by Hitachi Maxell, Ltd.
It takes full advantage of the advantages of magneto-optical recording that conventional magnetic prints do not have. The proposed magneto-optical recording printed material is composed of barium ferrite magnetic material, while the conventional magneto-optical disk system for data storage is composed of an amorphous alloy of a rare earth metal and a transition metal.

The authenticity determination function used for the current printed material is a function of determining the authenticity of the printed material by human eyes such as photo printing and hologram printing, and machine-readable recording on the printed material. It can be divided into a genuine / counterfeit judgment function by a reproducing device for reproducing data. The current printed body is provided with a combination of various authenticity determination functions having these functions, and functions as a comprehensive authenticity determination function of the printed body. Since the human being possesses and uses the printed material, both the functions of the human being's own authenticity determination function and the direct authenticity determination function of a machine providing various services are required.

At present, there is no print body authenticity judging function which provides both functions of the above two kinds of authenticity judging functions as a single system using the same material.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a printed body that can be visually observed by a human, which does not have the conventional authenticity determination function. It is equipped with both the function to judge the authenticity of the print and the function to judge the authenticity by the machine such as the device for reproducing the recorded data of the printed material, that is, the function to judge the authenticity by the machine as a single system. Providing printed matter.

[0006]

In order to solve this problem, the present invention provides a reflective film on a base material, and a pattern printing layer made of a magnetic ink made of iron garnet-based magnetic powder on the reflective film. Provided is a pattern printed material using a magnetic ink having a surface polarizing layer, which is characterized in that a surface layer having a polarizing property is provided.

Hereinafter, the present invention will be described in detail. The magnetic ink according to the present invention is a coating composition composed of bismuth rare earth iron garnet magnetic powder having a magneto-optical effect. By forming the pattern print layer by this, it is possible to realize both the function of judging the authenticity by human eyes and the machine-readable function of judging the authenticity by machines.

That is, the pattern printing layer of the magnetic ink having the magneto-optical effect is detected by the means used by the machine by means used in the magneto-optical disk system or by recording / reproducing the magnetically recorded content. be able to.

Further, by using a pattern printing layer made of magnetic ink having a magneto-optical effect and a surface layer having polarized light provided on the pattern printing layer, the magnetic pattern of the pattern printing layer can be recorded by a human using a device similar to an ordinary microscope. It becomes possible to confirm it visually.

[0010]

The function of visually confirming the magnetic mark by using a print pattern showing the magneto-optical effect will be described. This function is equivalent to replacing the optical sensor part with human vision in the reproducing system for magneto-optical disks. The structure of the visual confirmation device 200 is shown in FIG. The light 10 used for observation passes through the half mirror 30 and the surface layer 4 having polarization and reaches the printed material 100. The light 10 undergoes rotation of the plane of polarization by the magneto-optical effect in the printed body 100, and then is reflected to have the polarized light, the surface layer 4 and the half mirror 30.
Through the analyzer 40 and visually observed. At this time, according to the uniform magnetic field applied by the permanent magnet 50, a difference in the amount of light transmission occurs between the pattern portion of the magnetic ink and the other portion, that is, it can be visually observed as a contrast. As shown in the figure, the symbol mark of a company etc. formed by pattern printing (this mark may be any mark, character, pattern, and can be easily made by printing magnetic ink) by human eyes Can be observed. This is because, for example, when pattern printing of magnetic ink and not magnetic ink but printing of the same color ink is provided, the difference between the visual observation when a uniform magnetic field is applied by the permanent magnet 50 or the like and when it is not clear becomes clear. It will be possible. For example, in a window such as a bank, when judging the authenticity of the presented printed material, the authenticity of the printed material can be judged in a very short time by using the magnetic ink pattern visualization device which is made compact. Further, the pattern printing layer having the magneto-optical effect showing this function can be detected by the authenticity judging device incorporated in a machine for reproducing magnetic recording and has a machine readable function.

[0011]

EXAMPLES Examples of the present invention are shown below. First, a procedure for forming a pattern print layer having a magneto-optical effect formed on a printed body will be described. The magnetic powder used in the ink used for coating was prepared as follows. Iron nitrate (III) [Fe (NO3) 3] (Kanto Chemical Co., Inc.) 60.6 g, yttrium nitrate [Y (NO3)]
3] (manufactured by Kanto Chemical Co., Inc.) and 22.9 g of bismuth nitrate [Bi (NO3) 3] (manufactured by Kanto Chemical Co., Ltd.) (300 ml) were prepared and mixed with nitric acid (manufactured by Kanto Chemical Co., Ltd.). PH was adjusted to 3.0. The temperature of this aqueous solution was adjusted to 25 ° C,
Same amount of ammonia water while stirring (manufactured by Kanto Chemical Co., Inc.)
To form a precipitate. The suspension of the precipitate was filtered and separated into a brown slurry-like precipitate and a filtrate.

The brown slurry precipitate obtained was treated with about 300
It was mixed with ml of water, washed, and filtered again. The above water washing treatment was repeated 5 times. The obtained precipitate was dried for 24 hours in an oven whose temperature was adjusted to 80 ° C. After roughly crushing the obtained powder in a mortar, 60
Heat treatment was performed for 4 hours in an air environment in an electric furnace set at 0 ° C. One more part of the powder that has been heat treated for 10 hours
Heat treatment was performed under the same conditions for 0 hours, it was confirmed that the saturation magnetization did not change, and it was confirmed that the heat treatment was sufficiently performed. FIG. 3 shows a magnetic powder synthesis procedure.

A magnetic ink was prepared using the prepared magnetic powder. 100 parts by weight of iron garnet powder (the above compound), binder (SS8000: Toyo Ink Mfg. Co., Ltd.)
100 parts by weight, dispersant (polyoxyethylene (2
0) sorbitan monolaurate: Wako Pure Chemical Industries, Ltd. Twin 20) 5 parts by weight, cyclohexanone 795 parts by weight,
Mix the above composition and crush it with a ball mill for 200 hours.
Dispersed.

A printed body having a pattern printing layer having a magneto-optical effect was experimentally produced by a coating method using the produced magnetic ink. 188 micron thick PET for magnetic printing (E-
28: An Al reflective film 120 was formed on Toray Co., Ltd. 110 by a vapor deposition method. On the PET having the produced reflective layer,
The magnetic ink prepared by the above procedure was applied by a screen printing method to form a pattern printing layer 130 having a magneto-optical effect with a thickness of 1.5 μm. The thickness was controlled by the density of the ink. After drying and curing treatment in an oven at 100 ° C. for 1 hour, the surface layer 140 having polarized light was adhered. The surface layer 140 having polarization has a thickness of 100 μm.
m polarizing film (manufactured by Nitto Denko Co., Ltd .: "NPFi-1"
220 DV ") was used. Through the above steps, a prototype printed body 100 having a pattern printed layer having a magneto-optical effect
Was produced. The layer structure of the prototype printed body 100 is shown in FIG.

Regarding the printed body 100 having the pattern printed layer 130 having the magneto-optical effect, the permanent magnet 50
A uniform magnetic field was applied and the magnetic field was observed by a magnetization pattern observation device 200 which was modified from a normal microscope. The structure of the observation device is shown in FIG. The pattern in FIG. 2 was a pattern with magnetic ink, and could be observed regardless of other non-magnetic ink of the same color. The magnetization pattern may be any mark, letter or pattern. Observation device 2
00 and the layout relationship between the prototype printed body 100 are shown in FIG.

[0016]

As described above, the printed material according to the present invention is a machine in which a pattern printing layer made of magnetic ink having a magneto-optical effect is used to detect the pattern printing layer by a system similar to a magneto-optical disk system. The readable authenticity judgment function and the authenticity judgment function visualized by the magneto-optical effect of the pattern printing layer and visually confirmed by humans,
Obtained by the same material system. Compared to the conventional authenticity judgment function that combines multiple security functions,
It is possible to provide a printed material having a highly sophisticated authenticity determination function extremely easily and at low cost.

[0017]

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a magnetic recording / reproducing device for a magneto-optical disk.

FIG. 2 is an explanatory diagram illustrating a configuration of a magnetic mark visualization device using a pattern printing layer having a magneto-optical effect according to the present invention.

FIG. 3 is an explanatory view showing a procedure for producing fine particles of bismuth rare earth iron garnet used in this example.

FIG. 4 is an explanatory diagram illustrating a configuration of a prototype print body having a pattern print layer having a magneto-optical effect according to the present invention.

FIG. 5 is an explanatory diagram illustrating a positional relationship between a magnetization pattern visualization device and a prototype printed body used in this example.

[Explanation of symbols]

1 ... Laser light source 2 ... Condensing lens 4 ... Surface polarizing layer
5 ... Half mirror 6 ... Condensing lens 8 ... Photodetector 9 ... Differential amplifier 10
Reproduction output 15 Light 30 Half mirror 50 Permanent magnet 100 Printed body 110 PET base material 120 Al reflective layer 130 Pattern printed layer having magneto-optical effect 140 Surface layer having polarization characteristics 200 Visual observation Device configuration

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yotaro Yamazaki 1-19-2 Migamioka, Midori-ku, Yokohama-shi, Kanagawa 4-5-206 Tama-Plaza Complex (72) Inventor Ken Namikawa 4-33, Kugahara, Ota-ku, Tokyo -9

Claims (1)

[Claims] 1. A reflection film is provided on a substrate, a pattern printing layer made of magnetic ink made of iron garnet-based magnetic powder is provided on the reflection film, and a surface layer having polarized light is provided thereon. A pattern printed material using a magnetic ink having a surface polarizing layer.