JP2682652B2 - Copy paper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copy sheet that can be used as an original for copying or as a transfer sheet for copying.

[Prior Art] With the widespread use of copying machines, it has been quite a few years since the voice of banning the duplication of originals from the publishing industry was frequently heard.

During this period, government agencies and general companies are often requesting whether or not paper that cannot be re-copied can be created from the viewpoint of preventing leakage of confidential information.

Then, in order to meet such a demand, there are the following methods.

(1) A method in which halftone dots are entangled in a tint block, and the hidden characters are raised by using the resolution of a copying machine to open or close the halftone dots.

In this method, when a copy is made, characters and patterns are exposed, so that the effect of warning against illegal copying or prevention of forgery is great, but there is a drawback that the original characters can be read.

(2) A method in which a special ink or paint is mixed with pulp or applied (or printed) to copy paper, and this ink (paint) changes the reflection characteristics of the paper and causes the entire surface to develop black when copied. .

In this method, the surface of the paper coated with the ink (paint) is colored in a brown color, so it is difficult to read the characters of the original document, and it may be possible to read it completely depending on the copying machine.

(3) A paper used as a manuscript is vapor-deposited with aluminum and then coated with a coloring agent and then overcoated, or in the case of a film, a coloring agent is applied on the front surface and aluminum is vapor-deposited on the back surface. A method that reflects light to make copying impossible.

With this method, the characters on the original are difficult to see, they cannot be used as transfer paper for copying, there is no effect on those created with a dot printer or typewriter, and they are more expensive than other methods. is there.

[Problems to be solved by the invention]

All of the above-mentioned conventional methods utilize the optical characteristics of the copying machine, and the original document to be re-copied has to be very difficult to read, ignoring human readability. there were.

On the other hand, in recent years, a copying machine having a mode capable of erasing a document image inside or outside an area surrounded by a line of density and thickness recognizable by an image reading sensor (hereinafter referred to as an erasing line), so-called digital With the spread of copiers, the function of such copiers was used to get the idea that the image at the time of recopying can be effectively erased without impairing the legibility of the original. It was

Therefore, by detecting the area surrounded by the frame of specific density,
Japanese Patent Application No. 61-1518 (Japanese Patent Application Laid-Open No. 62-159570) has proposed a digital copying machine which can perform trimming copying for erasing the inside and masking copying for erasing the outer area.

That is, it is possible to read an original by a scanner, which is a characteristic of a digital copying machine, and to erase a specific area in the digitization processing of the read information by defining an operation mode for a certain designation signal, and this function is used.

Therefore, the object of the present invention, in combination with the function of the copying machine,
(EN) Provided is a copier paper which can prevent leakage of a secret due to recopying without impairing the readability of the original.

[Means for solving the problem]

In order to achieve the above object, in the copier paper of the present invention, an arbitrary area is continuously surrounded by a continuous erasing line, and two or more plural areas are further surrounded by the surrounded area. The erasing line is used for partitioning.

[Action]

The erase line applied to the paper is read by the image reading sensor, and the inside or outside of the area surrounded by the erase line is not reproduced as an image by digital processing.

〔Example〕

First, an example of a digital copying machine suitable for carrying out the present invention will be described.
This will be described with reference to FIG.

Reference numeral 41 indicates the scanner unit, and the image of the document 42 is a mirror.
Solid-state image sensor (CCD) 43 through M ₁ , M ₂ , M ₃ and lens L
Is converted into an electric signal.

The image signal thus obtained is processed by the image signal processing unit 44.

Reference numeral 45 indicates a printer unit, which is connected to the laser diode drive unit 46 by a signal line.

The laser diode drive unit 46 drives the laser diode 47 according to the image signal processed by the image signal processing unit 44, and the laser light emitted is a polygon mirror 48 and a mirror.
Through M ₄ , the photoconductor 50, which has been previously charged by the charger 49, is exposed. As a result, an electrostatic latent image corresponding to document information is carried on the photoconductor 50.

Thus, the electrostatic latent image carried on the photoconductor 50 is developed by the developing unit 51.
Transfer paper cassette 52 or transfer paper cassette
The image is transferred by the transfer unit 54 onto the transfer paper fed from 53.

After that, the transfer paper is discharged to the paper discharge tray 56 via the fixing unit 55.

Next, referring to FIG. 11, the control unit 57 of the digital copying machine.
The operation unit 58 will be described.

Reference numeral 59 is a copy start key, reference numeral 60 is a ten key for inputting the number of copies, reference numeral 61 is a copy number display, reference numeral 62 is a trimming copy instruction key, and reference numeral 63 is a masking copy instruction key.

Trimming copy instruction key 62 and masking copy instruction key
63 is mutually exclusive and after one is pressed,
If the other is pressed, the former instruction becomes invalid. Also, pressing the same key again cancels the instruction.

Reference numerals 64 and 65 are LEDs that light up when trimming copy and masking copy are instructed, respectively.

Reference numeral 66 denotes a switch provided at a position other than the operation unit 58 and at a position where a general operator cannot operate. Lever 67
Although it does not function particularly when is at the neutral point, when it is connected to the terminal 68, trimming copy is instructed similarly to when the trimming copy instruction key 62 is pressed.

When the terminal 69 is connected, masking copy is instructed in the same manner as when the masking copy instruction key 63 is pressed. At this time, the LEDs 64 and 65 are turned on according to the respective instructions.

In addition, when any one is instructed by the switch 66,
Trimming copy instruction key 62, Masking copy instruction key 63
Pressing is invalid.

Therefore, if a group of companies equipped with such a digital copying machine sets the switch 66 to, for example, the trimming copying mode, copying will be performed as long as the information to be kept secret is written within the frame of the specific density on the paper. Even so, it does not appear as an image, and in that sense it is a measure to prevent secret leakage.

The above-mentioned measures against the leakage of secrets are actually profitable by applying a specific density to the paper for the digital copying machine, that is, the paper used as the original and the paper used as the transfer paper.

 Some examples of use will be described with reference to FIG.

It is assumed that a sheet without any specific density frame is the original S ₁ and the information A is written on the original S ₁ . Meanwhile, paper S ₂
An erasing line LL, which is a density and thickness line that can be identified by the CCD 43 which is the image reading sensor of the digital copying machine, is provided on the.

If this paper S ₂ is used as a transfer paper and a copy is made in a normal mode with a digital copying machine, the information A is erased by the LL line LL.
It is possible to obtain the sheet S _'2 having within.

The sheet S _'2 in case of the original document, information A does not appear in the transfer sheet S ₃ when the re-copied by a digital copying machine that has been set to the trimming copy mode.

Therefore, if confidential information is written on the general form,
If you want to make a large number of copies of this as a meeting material, and if there is a sheet S ₂ on which the erasing line LL has been printed in advance, you can create an original (sheet S ′ ₂ ) having a re-copying prevention function by copying in a short time. it can.

Alternatively, a paper S ₂ from the beginning, this secret information A
If this is written, this immediately becomes an original (paper S ″ ₂ ) having a recopy preventing function. Therefore, even if this paper S ″ ₂ is used as an original, it is transferred by a digital copying machine set in the trimming copy mode. Information A does not appear on paper S ₃ .

In this way, it is extremely convenient to form the erasure line LL on the paper used for the digital copying machine as the document or the transfer paper in advance in order to prevent the secret leakage.

Incidentally, in FIG. 9, if a copy is made using a normal transfer sheet having no erasing line, the information A appears on the sheet S ₄ . Furthermore, as long as normal transfer paper is used even if it is copied again,
Information A appears on sheet S ₅ .

The erase line LL is formed as a closed rectangular outer frame on the outer edge of the sheet as shown in FIG. This is because the information can be written only within the range of the paper, and enclosing the information with continuous continuous lines is a requirement for exerting the trimming function or masking function of the digital copying machine.

However, that may still be inconvenient. When a document is set and transferred in a state where a part of the outer frame consisting of the erasing line is intentionally removed from the reading area by the CCD43, the erasing line does not enclose confidential information in continuous lines. This is because the information is copied even in the trimming mode.

In order to avoid this inconvenience, it is sufficient to partition by an erasing line so that two or more areas can be further formed within the area surrounded by the outer frame.

 1 to 7 show a concrete mode thereof.

In the example shown in FIG. 1, the erasing line LL _{1 on the} paper S is used.
The outer frame composed of the erasing line LL is divided into two parts.

In this case, even if one area is copied by slightly shifting the original made of the paper S from the platen of the digital copying machine, the other area is not copied as long as it is surrounded by the erase line. .

The example shown in FIG. 2 shows a large number of concentric erase lines LL.
_The outer frame is divided into _two parts.

In this case, there is a merit that a missing portion is generated in copying the secret information in various unpredictable modes that follow a curve depending on how the document is displaced.

In the example shown in FIG. ₃ , the outer frame is multi-divided by a large number of small circular erasing lines LL ₃ which are in contact with each other.

In the example shown in FIG. 4, a large number of regions are formed in the outer frame by a large number of small circle-shaped erasing lines LL ₄ spaced apart from each other. The arrangement of the small circular areas is disturbed in a zigzag manner to disturb the reproduction information.

The example shown in FIG. 5 is based on a valve shape consisting of an erasing line LL ₅ , on which a stepped erasing line LL ₆ consisting of thin lines is added.
In order to subdivide the area by combining, we aim for an effect that is easy to see visually. The enlarged state is shown in FIG.

In the example shown in FIG. 7, a large number of sawtooth-shaped erasing lines LL ₈ are orthogonal to a parallel line composed of the erasing lines LL ₇ to form a large number of regions in the outer frame.

FIG. 8 shows this in an enlarged manner, and a thin line 70 drawn in the middle of each small area is aimed at visual effects such as visibility. Various other modes are possible.

It is desirable that each erasing line described above be as readable as possible by the human eyes even though it can be read by the CCD 43.

The thickness, density, color characteristics, etc. of the line used as the erasing line are appropriately determined based on the human visual characteristics and the reading characteristics of the CCD 43. For example, a sufficient effect was observed with a line thickness of 2 mm and a density of 0.6.

The erasing line formed inside the outer frame is related to the function of the digital copying machine, and the size of one of the plurality of areas is formed, for example, in the maximum area that makes information unreadable.

〔The invention's effect〕

By using the paper according to the present invention, it is possible to easily create a copy original that can prevent leakage of secret due to recopying without impairing readability.

[Brief description of the drawings]

1 to 5 and 7 are front views of the copying machine paper according to the present invention, and FIG. 6 is a partially enlarged view of FIG.
FIG. 8 is a partially enlarged view of FIG. 7 above, FIG. 9 is a diagram for explaining various processes for making a copy using the paper according to the present invention, and FIGS. 10 and 11 are for implementing the present invention. It is a schematic explanatory drawing of a suitable digital copying machine. S: Paper, LL, LL ₁ , LL ₂ , LL ₃ , LL ₄ , LL ₅ , LL ₆ ... Erase line.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shinichi Ito 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Tamotsu Harada 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh

Claims (1)

(57) [Claims] 1. A copying machine having a mode capable of erasing a document image inside or outside an area surrounded by a line of density and thickness recognizable by an image reading sensor (hereinafter referred to as an erasing line). A sheet of paper to be erased, wherein an arbitrary area is continuously surrounded by a continuous erasing line, and the erasing line is formed so that two or more plural areas can be formed in the surrounded area. Copy paper characterized by being separated by.