JP2009034921A - Forgery preventing slip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery preventing slip in which a latent image and the background printed on the slip are made difficult to identify by the eyes and in which, if copied, the latent image is clearly revealed. <P>SOLUTION: In the forgery preventing slip 1, a latent image 3 is printed by one type, either a line pattern easily reproduced in copying or dots hard to be reproduced in copying, and the background 4 is printed by the other. In one side edge or both side edges in the line width direction of each line 5 constituting the line pattern, there are formed a plurality of extended projections 6 protruding along the line width direction, and longitudinally along the line 5. As a result, if the forgery preventing slip 1 is copied, a gap between respective extended projections 6 is buried by the reproduction characteristic of a copying machine, with the line width of each line 5 expanded that constitutes the line pattern. Accordingly, without degrading non-visual recognition of the latent image 3, in the event of the copying, the latent image 3 can be clearly revealed by the line width expansion of the line pattern. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a forgery prevention form capable of preventing forgery by copying.

In general, forgery printed on securities, certificates, registration certificates, and other forms, which makes it difficult to identify the latent image and the background with the naked eye to prevent forgery by copying with a color copier. Prevention forms are known (see, for example, Patent Document 1). Such a forgery-preventing form prints a latent image on one side of the form paper, which is easy to be reproduced by copying and halftone dots which are difficult to be reproduced by copying, and on the part other than the latent image by the other side. By printing the background, the latent image is assimilated into the background on the form paper, making it difficult to identify with the naked eye. When copied, the latent image becomes visible on the copy paper due to the density difference and can be identified It is trying to become.
JP 60-79991 A

  By the way, in the anti-counterfeit form using the lines and halftone dots as described above, the latent image is excellent in non-visibility, and when copied, the latent image is clearly visible. In order to achieve this, the number of lines and halftone dots and the composition area ratio are set, but the lines and halftone dots are difficult to distinguish with the naked eye because the latent image and background on the form paper are difficult to identify with the naked eye. If the difference between the number of lines and the composition area ratio is set to be small, the revealability of the latent image when copied becomes worse, and conversely, the revealability of the latent image when copied is increased. If the difference between the number of lines and halftone dots and the compositional area ratio is set large, the latent image on the form paper and the background can be easily identified with the naked eye, and the invisibility of the latent image is reduced. There was a problem.

  The present invention has been made in view of such a conventional situation, and makes it difficult to distinguish between a latent image and a background on a form sheet with the naked eye, and when copied, the latent image is clearly manifested easily. It is an object of the present invention to provide a forgery prevention form that can be identified.

  In the present invention, a latent image is printed on one of a line that is easily reproduced by copying and a halftone dot that is difficult to be reproduced by copying, and a background is printed by the other on the form paper. In the forgery prevention form in which the latent image becomes identifiable and can be identified by the above, an extended protrusion projecting along the line width direction is formed on one side edge or both side edges of each line constituting the line. It is a forgery prevention form characterized by being formed in plural along the longitudinal direction.

  In such a forgery prevention form, the thickness of each line constituting each line is 0.03 to 0.15 mm, the lateral width of the extension protrusion is 0.03 to 0.15 mm, the extension width of the extension protrusion is 0.03 to 0.15 mm, and the extension protrusions are mutually A configuration is proposed in which the distance between the lines is 0.03 to 0.2 mm, and the distance between the lines constituting the lines is 0.3 to 0.6 mm.

  Here, when the distance between the lines constituting the line is 0.3 mm, the protrusion width of the extension protrusion is 0.15 mm, and the extension protrusions are formed on both side edges in the line width direction of each line, It is desirable that the extension protrusions are not in contact with each other between adjacent lines by shifting the extension protrusions formed along the longitudinal direction of the lines so as to be staggered. A halftone dot that is difficult to reproduce by copying is a halftone dot composed of fine dots and density (composition area ratio) that are difficult to be resolved by a copier. This includes 150 lines and a composition area ratio of 10%. A halftone dot can be suitably used.

  In the present invention, as described above, a plurality of extended protrusions projecting along the line width direction are formed on one side edge or both side edges of each line constituting each line along the line width direction. Thus, when copying, the gap between the extended protrusions is filled by the reproduction characteristics of the copying machine, and the line width of each line constituting the line is expanded. As a result, when copying without reducing the non-visibility of the latent image in the forgery prevention form, the latent image can be clearly revealed by expanding the line width by filling the gap between the extended protrusions. Can be identified. In addition, it is possible to use a line with a line width thinner than that of a normal line, and if the line width of the line is narrower than the line width of a normal line, the latent image and background The identification with the naked eye can be made even more difficult.

  In addition, the thickness of each line constituting the line is 0.03 to 0.15 mm, the lateral width of the extension protrusion is 0.03 to 0.15 mm, the protrusion width of the extension protrusion is 0.03 to 0.15 mm, and the distance between the extension protrusions is 0.03 to 0.2 In the configuration in which the distance between lines constituting mm and lines is 0.3 to 0.6 mm, the improvement in the non-visibility of the latent image on the form paper and the above-described line width expansion effect during copying are good. Can be realized.

Below, one Example of the forgery prevention form concerning this invention is described based on FIGS. 1-3.
As shown in FIG. 1, the forgery prevention form 1 has a latent image 3 representing characters such as “copy” printed on a form sheet surface 2 that is easily reproduced by copying. A background 4 made of a background pattern is printed on the portion. The background 4 is printed using halftone dots having 150 lines and a composition area ratio of 10%, which are difficult to reproduce by copying. Also, the lines constituting the latent image 3 and the halftone dots constituting the background 4 are printed with the same color ink, and black, sepia, green, purple, and light blue are suitable as the color of this ink. Can be used.

  As shown in FIG. 2 (A), the lines constituting the latent image 3 are extended protrusions projecting along the line width direction on one side edge of the lines 5 constituting the line. A plurality of 6 are formed along the longitudinal direction of the line 5. Here, the thickness D of each line 5 is set to 0.03 to 0.15 mm, preferably 0.05 to 0.1 mm, and the lateral width W of the extended protrusion 6 is set to 0.03 to 0.15 mm, preferably 0.05 to 0.1 mm. The projecting width H of the part 6 is set to 0.03 to 0.15 mm, preferably 0.05 to 0.1 mm, and the interval S between the extended projecting parts 6 is set to 0.03 to 0.2 mm, preferably 0.05 to 0.15 mm, forming a line. The distance B between the lines 5 to be set is set to 0.3 to 0.6 mm, preferably 0.4 to 0.6 mm. In addition, the space | interval S between each extended protrusion 6 may be a fixed space | interval, and may change individually within the said numerical range. The minimum value of each setting value above is the minimum dimension value that can be resolved by a copying machine and causes area expansion due to reproduction characteristics of the copying machine, and the maximum value of each setting value is a latent image. 3 is the maximum dimensional value of the limit for maintaining the non-visibility.

  In such a configuration, the forgery prevention form 1 has a latent image 3 printed on the form paper surface 2 and the background 4 that is difficult to identify with the naked eye, and looks only as a background pattern. Thus, when the anti-counterfeit form 1 is copied with a color copier, the reproducibility of the copier fills the gaps between the extended projections 6 as shown in FIG. The line width of each line 5 is expanded. Here, the reproduction characteristic is a characteristic that is reproduced in a state where the area is larger than the actual object when copied, and is a phenomenon similar to the dot gain generated when a dot is copied. On the other hand, since the background 4 is printed with halftone dots that are difficult to reproduce by copying, the background 4 disappears or discolors. As a result, as shown in FIG. 3, the latent image 3 is clearly manifested in the copy paper 1 ′ obtained by copying the forgery prevention form 1, and it is easy to confirm that the form has been copied. Can be recognized.

  According to the present invention, when copying is performed without reducing the invisibility of the latent image 3 in the forgery prevention form 1, the latent image is expanded by the line width expansion by filling the gap between the extended protrusions 6. It is possible to make the image 3 clearly visible and easily identifiable. Further, it is possible to use a line having a line width thinner than that of a normal line. If the line width of the line is made smaller than the line width of the normal line, the latent image 3 and The identification of the background 4 with the naked eye can be made even more difficult.

  FIG. 4 shows a second embodiment, and this embodiment protrudes along the line width direction at both side edges in the line width direction of the respective lines 5 constituting the line as shown in FIG. 4 (A). A plurality of extended protrusions 6 are formed along the longitudinal direction of the line 5. Further, the thickness D of each line 5, the lateral width W of the extended protrusion 6, the protruding width H of the extended protrusion 6, the distance S between the extended protrusions 6, and the distance B between the lines 5 constituting the line are described above. It is set to be the same as the numerical value of the first embodiment. In addition, when the interval B between the lines 5 constituting the line is 0.3 mm and the protrusion width of the extension protrusion is 0.15 mm, the extension protrusions 6 are not in contact with each other between the adjacent lines 5. The extended protrusions 6 of the adjacent lines 5 are formed so as to be staggered along the longitudinal direction of the lines 5. Further, even when the numerical values are set so that the extended protrusions 6 are not in contact with each other between the adjacent lines 5, the extended protrusions 6 of the adjacent lines 5 are staggered along the longitudinal direction of the line 5. This is advantageous in terms of improving the non-visibility as compared with the case of being at the same position.

  In such a configuration, when the forgery prevention form 1 is copied with a color copier, the reproducibility of the copier fills the gaps between the extended protrusions 6 as shown in FIG. The line width of each line 5 which comprises is expanded. Here, the line width expansion occurs on both sides of each line 5 in the line width direction, so that the line width expansion rate can be increased as compared with the first embodiment.

  In each of the above embodiments, the latent image 3 is printed with lines that are easily reproduced by copying. Instead, the background 4 is printed with lines that are easily reproduced by copying, and is difficult to be reproduced by copying. It is also possible to print the latent image 3 with halftone dots. In addition, when the latent image 3 or the background 4 is printed with halftone dots that are difficult to reproduce by copying, the latent image 3 or the background 4 can be formed as a background pattern having fine white characters or white patterns. is there. Further, the line may be composed of a plurality of arcuate curves constituting concentric circles, in addition to a line composed of a plurality of straight parallel lines.

It is a schematic plan view which shows the forgery prevention form 1 concerning this invention. (A) is a schematic diagram which shows the form of each line 5 which comprises the parallel line concerning a 1st Example, (B) is a schematic diagram which shows the form of each line 5 which line width expanded by copying. FIG. 2 is a schematic plan view showing a copy sheet 1 ′ on which a forgery prevention form 1 is copied. (A) is a schematic diagram which shows the form of each line 5 which comprises the parallel line concerning 2nd Example, (B) is a schematic diagram which shows the form of each line 5 which expanded the line width by copying.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-counterfeit form 2 Form paper surface 3 Latent image 4 Background 5 Line 6 Expansion protrusion B Distance between 5 lines D Thickness of line 5 H Projection width of expansion protrusion 6 S Spacing between expansion protrusions 6 Expansion protrusion 6 width

Claims (2)

The latent image is printed on the form paper by either one of the lines that are easy to reproduce by copying and the halftone dots that are difficult to reproduce by copying, and the background is printed by the other. In the anti-counterfeit form that becomes obvious and can be identified,
A counterfeit characterized in that a plurality of extended protrusions projecting along the line width direction are formed on one side edge or both side edges of each line constituting the line along the line width direction. Prevention form.   The thickness of each line constituting the line is 0.03 to 0.15 mm, the lateral width of the extension protrusions is 0.03 to 0.15 mm, the protrusion width of the extension protrusions is 0.03 to 0.15 mm, and the distance between the extension protrusions is 0.03 to 0.2 mm. The counterfeit prevention form according to claim 1, wherein an interval between lines constituting the line is 0.3 to 0.6 mm.

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