JP2008221784A - Duplication-proof printed matter and printing machine for creating duplication-proof printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplication-proof printed matter which can inhibit duplication of a printed image simply and certainly and a printing machine which creates the duplication-proof printed matter. <P>SOLUTION: This duplication-proof printed matter has a duplication-proof sheet, which does not transmit a visible light to be incident perpendicularly and selectively transmits the visible light to be incident in the oblique direction, pasted to a region where the inhibition of duplication of the printed matter is desired. In addition, the duplication-proof printed matter can inhibit image duplication by a duplicator or image reading by a scanner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a copy-proof printed matter and a printing machine for creating a copy-proof printed matter.

  As a method for preventing copying of printed matter, a method of increasing the reflectance by evaporating metal or the like on a printing medium (see, for example, Patent Document 1), an image different from the original on the copied matter by forming minute irregularities on the printed surface. There has been proposed a method (for example, see Patent Document 2) and the like. However, the former method has a drawback that the visibility of the printed matter itself is deteriorated, and the latter method has a disadvantage that the copied printed matter can be substantially identified.

  Also, using the fact that the direction of the incident light and the light receiving part of the copying machine is not strictly perpendicular to the printing surface, a method of attempting to prevent copying by attaching a film that can be seen only from the front (right angle) to the printed matter. (For example, see Patent Document 3) has also been proposed. However, the direction of the incident light and the light receiving unit of the copying machine is slightly different from the right angle. Therefore, the visible angle must be narrowed, resulting in poor visibility.

In addition, a method for preventing copying by applying a hologram sticker (see, for example, Patent Document 4) has been proposed, but the hologram itself is expensive to manufacture, and the visibility of printed matter must be sacrificed. There's a problem.
JP-A-2005-329652 JP-A-8-39923 Japanese Patent Laid-Open No. 7-140859 JP-A-6-259013

  The present invention has been made under the circumstances as described above, and an object of the present invention is to provide a copy-prevented printed material that can easily and reliably prevent copying of a printed image and a printing machine that creates the copy-proof printed material.

    In order to solve the above problems, the first aspect of the present invention selectively transmits visible light incident in an oblique direction without transmitting visible light incident in a vertical direction to an area where copy protection of printed matter is desired. Provided is a copy-prevented printed matter that is capable of preventing copying by a copying machine or image reading by a scanner, which is characterized by being attached with a copy-preventing sheet.

  As a copy prevention sheet used for such a copy prevention printed matter, a sheet having a maximum transmittance angle of 20 to 60 ° can be used. Further, as such a copy prevention sheet, it is possible to use a sheet in which a louver composed of a large number of sheets disposed at a predetermined angle between two opposing transparent sheets.

  According to a second aspect of the present invention, there is provided means for printing a predetermined image on a sheet, and visible light incident in an oblique direction without transmitting visible light incident in a vertical direction to a predetermined region of the printed image. A means for laminating a copy-preventing sheet that selectively permeates the image, and a copy-preventing printed matter can be produced by printing an image and laminating the copy-preventing sheet in one operation. A simple printing machine.

  According to a third aspect of the present invention, there is provided means for transferring a predetermined toner image onto a sheet, and selecting the visible light incident in an oblique direction without transmitting visible light incident in the vertical direction to the transferred toner image. A copy-preventing printed matter characterized by comprising means for simultaneously fixing a toner image and laminating a copy-preventing sheet by covering with a transparent copy-preventing sheet and heating or pressing. Provide a printing machine.

  According to the present invention, it is possible to efficiently and reliably prevent copy of printed matter.

  Embodiments of the present invention will be described below.

  A copy-prevented printed matter according to an embodiment of the present invention is characterized in that a copy-preventing sheet is pasted on an area where copy protection is desired on the printing surface. The copy protection sheet does not transmit visible light incident in the vertical direction but selectively transmits visible light incident in an oblique direction, and the incident angle for selectively transmitting visible light is appropriately controlled. can do. The incident angle having the highest transmittance is called the maximum transmittance angle.

  For example, the copy protection sheet preferably has a maximum transmittance angle of 15 to 60 °, preferably 30 to 60 °. The larger the maximum transmittance angle is, the better the anti-copying performance is. However, when the maximum transmittance angle is too large, the visual visibility deteriorates.

  FIG. 1 shows a mechanism of light transmission / non-transmission by the copy prevention sheet. In FIG. 1, the copy protection sheet 1 has a function of reflecting or absorbing visible light 2 incident in the vertical direction without transmitting it and selectively transmitting visible light 3 incident in an oblique direction.

  As the copy prevention sheet having such a function, a sheet formed by arranging a louver composed of a plurality of sheets disposed at a predetermined angle between two opposing transparent sheets can be used. By controlling the louver arrangement angle, the maximum transmittance angle can be appropriately controlled.

  If a black louver is used, the portion of the printed material covered with the copy protection sheet is copied to a black solid color. If a white louver is used, the portion of the printed material covered with the copy protection sheet is copied plain. Is done.

  As a copy prevention sheet using such a louver, a view control film (VC-609518: manufactured by Shin-Etsu Polymer Co., Ltd.) made of polycarbonate having a maximum transmittance angle of 23 ° can be mentioned.

  The method of controlling the maximum transmittance angle is not limited to the method of controlling with the louver, for example, a method of providing a colored layer obliquely in the sheet, or a layer of materials having different refractive indexes provided obliquely in the sheet from the front. A method of scattering visible light, a method of making a cut in the sheet to scatter visible light from the front, a method of partially providing a visible light transmitting material portion obliquely on the colored sheet, and the like may be used.

  The material of the copy prevention sheet is not limited to a polycarbonate sheet, and various materials of resin can be used. Examples of such resins include polyethylene, polypropylene, polystyrene, polycycloolefin, polybutadiene, polyacrylic acid, polyacrylic ester, polyester, polyvinyl alcohol, polyvinyl acetate, polyvinyl acetal, polyvinyl chloride, polychlorinated biphenyl, poly Ethers, polyacetals, polyacrylonitriles, ionomers, polyurethanes, polyamides, polyimides, phenol resins, cellophanes, and the like, and copolymers thereof may be used alone or in combination. However, when used in an electrophotographic printer, from the viewpoint of toner fixing temperature, a heat-resistant sheet having a softening temperature of 200 ° C. or higher is desirable.

  As described above, according to the copy-prevented printed material according to the embodiment of the present invention, since the copy-preventing sheet is attached to the area where the copy-prevention is desired on the printing surface, the copy image can be easily and reliably copied by the copying machine. Can be prevented.

  That is, in copying by a copying machine, visible light is irradiated on a printed matter from a substantially vertical direction (incidence angle 0 °), and the reflected light is received to identify an image. Since the light does not pass through the copy prevention sheet, the printed image cannot be recognized and copying is impossible. Since the copy prevention sheet transmits visible light from a predetermined angle, the print image can be recognized by observing the print image from the predetermined angle.

  According to another embodiment of the present invention, a printing machine for creating a copy-prevented printed material laminates the above-described copy-prevention sheet on a predetermined area of the printed image and a unit that prints a predetermined image on paper. Means. This printing machine has a structure in which means for laminating a copy prevention sheet is provided downstream of the transfer means of a normal copying machine.

  According to such a printing machine, it is possible to simultaneously perform printing of an image and laminating of a copy prevention sheet in one operation, and it is possible to efficiently produce a copy prevention printed matter.

  A printing machine according to still another embodiment of the present invention includes a unit that transfers a predetermined toner image onto a sheet, and a heating or pressurizing unit. This printing machine has a structure in which means for heating or pressurizing is provided instead of the transfer means of a normal copying machine, covering the copy prevention sheet.

  According to such a printing machine, after covering the copy prevention sheet, it is possible to perform fixing of the toner image and lamination of the copy prevention sheet simultaneously by heating or pressurizing, thereby preventing the copy efficiently and with less energy. You can create printed materials.

  When heat fixing is used for fixing the toner image, the printed image is covered with a heat-sensitive adhesive applied to the back surface of the copy prevention sheet, and then heated to heat the toner image and the copy prevention sheet. Can be simultaneously performed. Also, when pressure fixing is used for fixing a toner image, the printed image is covered with a pressure-sensitive adhesive applied to the back surface of the copy prevention sheet, and then the toner image is fixed and the copy prevention sheet is pressed. Can be simultaneously performed. It is also possible to provide the printer with means for applying such a heat-sensitive adhesive and a pressure-sensitive adhesive to the back surface of the copy prevention sheet.

  Below, the Example and comparative example of this invention are shown.

Example 1
A copy-proof printed matter is created by pasting a polycarbonate sheet (VC-609518: manufactured by Shin-Etsu Polymer Co., Ltd.) with a maximum light transmittance angle of 23 ° (slight transmittance at 0 ° is slight) on the printed surface of the printed matter. did.

  An attempt was made to copy this copy-prevented printed matter using a monochrome copying machine (imagio Neo 602 manufactured by Ricoh Co., Ltd.). As a result, the portion where the copy protection sheet of the printed material is pasted becomes black, and it is impossible to confirm the printed content.

Comparative Example 1
A polycarbonate sheet (VC-609500: manufactured by Shin-Etsu Polymer Co., Ltd.) having a maximum light transmittance angle of 0 ° (that is, the highest transmittance at the straight front) was attached to the printed surface of the printed matter. The printed material was copied with a monochrome copying machine (imagio Neo 602 manufactured by Ricoh Co., Ltd.). As a result, the part where the sheet was pasted was slightly black, but the printed content below it could be easily confirmed.

It is a figure explaining the function of the copy prevention sheet used for one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Copy prevention sheet, 2 ... Visible light incident in a perpendicular direction, 3 ... Visible light incident in an oblique direction.

Claims (5)

  A copying machine characterized in that a copy protection sheet that selectively transmits visible light incident in an oblique direction but not transmitting visible light incident in a vertical direction is attached to an area where copy protection of printed matter is desired. Copy-proof printed matter that can interfere with copying by the scanner or image reading by the scanner.   The copy protection printed matter according to claim 1, wherein the copy prevention sheet has a maximum transmittance angle of 20 to 60 °.   3. The copy-prevented printed matter according to claim 1, wherein the copy-preventing sheet comprises a louver composed of a plurality of sheets arranged at a predetermined angle between two opposing transparent sheets. .   Means for printing a predetermined image on paper, and a copy prevention sheet that selectively transmits visible light incident in an oblique direction without transmitting visible light incident in a vertical direction to a predetermined region of the printed image A printing machine that performs printing of an image and lamination of a copy prevention sheet in one operation to produce a copy prevention printed matter.   A means for transferring a predetermined toner image onto a sheet, and the transferred toner image is covered with a copy prevention sheet that selectively transmits visible light incident in an oblique direction without transmitting visible light incident in a vertical direction. A printing machine for producing a copy-proof printed matter, comprising means for heating or pressurizing to simultaneously fix a toner image and laminate a copy-proof sheet.

Images