JPH0531980U - Reproduction proof paper - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] A sheet of paper that can be immediately discriminated when duplicated. [Structure] Line-shaped prints 2 and 1a that form characters or backgrounds and dot-shaped prints 1 and 2a that form backgrounds or characters that are visually identifiable and are hardly detected electrically, have substantially the same density,
In addition, printing is performed at a density that does not interfere with printing and identification of type characters to form a duplicate proof paper. [Effect] As described above, since the dot prints 1 and 2a which are visually recognizable and hardly detected electrically are applied to the characters or the background, when the paper is copied, the dot print portions become white and the lines Only the portions of the pattern prints 2 and 1a are copied, the contrast becomes clear, and a word or the like that prohibits copying appears on the copied paper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a copy proof paper in which a character such as "copy prohibited" appears clearly on copy paper other than the original.

[0002]

[Prior Art]

 Conventionally, documents that are prohibited to be copied are stamped with characters such as "Unauthorized duplication" or printed in advance. Are becoming available.

[0003]

[Challenges for devising]

 Then, the subject of this invention is to provide the duplicate proof paper which can discriminate what was copied at a glance.

[0004]

[Means for solving the problem]

 In order to solve the above-mentioned problems, in the present invention, line-shaped printing that forms a character or background and dot-shaped printing that forms a background or a character that is visually recognizable and that is rarely formed electrically have almost the same density. In addition, a duplicate proof paper was formed by printing at a density that did not interfere with printing and identification of type characters.

[0005]

[Action]

 As mentioned above, the dots or dots on the characters or background that are visually recognizable and hardly detected electrically are printed.When the paper is copied, the dots or dots are printed in the color of the paper (usually white). ), Only the line-printed part is copied, and the contrast becomes clear. For example, the characters “unauthorized reproduction” appear.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, character printing 1 is performed by a halftone dot screen, and background printing 2 is performed by a line screen around the character printing 1. On the contrary, the character printing 1a by the line screen and the background printing 2a by the halftone screen may be performed.

The character prints 1 and 1a and the background prints 2 and 2a may be of any color as long as they are color sensitive to the copying machine, but it is preferable to print in the same color. Also, the characters can be selected appropriately. The printing may be performed on a part of the paper, but it is preferable that it is printed on the entire surface.

The dot screen has a density of about 80 to 175 lines / inch, preferably about 100 to 150 lines, and a line screen has a density of about 40 to 60 lines / inch, particularly about 50 lines. ..

The printing density is 15 to 25%, preferably around 20% in the printing area.

In addition to the diagonal lines formed by the parallel line screen, a lattice pattern can be used.

When linear and dot printing with the density and density as described above is performed, the color becomes light as a whole, and it is difficult to visually recognize the characters. Therefore, the type characters printed on this paper can be clearly distinguished. be able to.

When this typed paper is copied by a copying machine, since the dots on the screen are not detected electrically, the screen part becomes white and only the linear part is copied. The contrast appears clearly as shown in FIG.

[0014]

【effect】

 According to this invention, as described above, dot printing and line printing that are visually identifiable but electrically insensitive are printed as thinly as possible, and only line printing is highlighted by copying. , It is possible to determine at a glance that it is a duplicate of the original, and it has a great effect of preventing duplication.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of the paper of this invention.

FIG. 2 is a plan view showing a copy of the above.

[Explanation of symbols]

 1,1a Text printing 2,2a Background printing

Claims (1)

[Scope of utility model registration request] 1. A line print forming a character or a background and a dot print forming a background or a character, which is visually recognizable and hardly detected electrically, have almost the same density and hinder the identification of the print and the type character. Duplicate proof paper printed with no density.