JPS608880A - Device for preventing copying of confidential document - Google Patents

Abstract

PURPOSE:To prevent copying of documents by treating the sheets of the confidential documents the copying of which is undesirable, with an IR absorber or a metal in advance, and detecting change of a transmitted amt. of IR rays. CONSTITUTION:A copying operation is hindered by utilizing the amt. of transmitted IR rays changed with an IR absorber or a metal contained in a confidential document, and detecting said sheets, or the contents of the copy is made understandable by a proper means. As the copying preventing sheet, a layer contg. an IR absorber represented by formula I (R is H, hydroxyethyl, or lower alkyl; X is an anion selected from hexafluoroarsenate ion, fluoroborate ion, perchlorate ion, hexafluoroantimonate ion, and nitrate ion; A is formula II or III, and m is 1 or 2, when m is 2, A is formula III.) or a layer 2 of a metal, such as aluminum, inserted between 2 sheets 1 is used. For example, a copying machine is provided with a photosensitive emitting element 7 so as to irradiate IR rays on the side of the glass 6 of the platen inside a platen cover 5, and a photodetector 8 having a scanning mechanism below the glass 6 opposite to the element 7, a switch 10 for detecting the position of the detector 8, and a warning device for displaying ''incapable of copying''.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a confidential document copy prevention device. More details d
For example, the present invention is a method for preventing copying of confidential documents in which a sheet for confidential documents that is not desirable to be copied is treated with an infrared absorbing agent or metal in advance, and a change in the amount of infrared transmission is detected to prevent the document from being copied. Regarding equipment.

BACKGROUND OF THE INVENTION With the proliferation of office copiers and facsimile machines, there has been a strong need to provide a practical means to prevent unauthorized copying of confidential documents or copyrighted records.

Several methods have already been proposed to solve this problem, one of which is disclosed in US Pat. No. 3,597,082. , which uses photochromic paper that temporarily changes color to substantially match the color of the image, thereby preventing the production of clear copies.

Another method of screening is to print records that are not to be reproduced on a sort with a special masking background with a special ink. This ink records in a certain spectral range F, the record is reflective and therefore invisible to the copier, but in the 1113 spectral range it is distinguishable from the masking background, and this property can be used to prevent copying. do. These two methods prevent copying in some types of copiers, but this method prevents copying on so-called White-Igbt Copiers, which use photosensitive paper coated with zinc oxide.
) cannot prevent copying. Additionally, the above method requires that the image be printed or written in precisely selected colors.

Purpose of the Invention Accordingly, it has been desired to develop a device that is not significantly affected by the color of the image and can prevent copying by any electrostatic copying machine including a sunlight copying machine or by a facsimile machine. The purpose is to provide a device d.

DESCRIPTION OF THE INVENTION In order to eliminate and improve the drawbacks of the prior art described above, the present invention provides means for detecting and responding to anti-copying notes by utilizing the amount of infrared transmission that varies depending on the infrared absorbing agent and metal in the document. This is installed in devices such as copying machines and 7mm facsimile machines.

It is preferable that the copy-preventing original sheet used in the present invention be treated in its entirety to ensure copy prevention. Also,
Metals used in the present invention include aluminum, iron, brass, stainless steel, and the like.

As shown in FIG. 1, the copy-preventing manuscript sheet used in the present invention consists of two sheets (gold), A/all or infrared absorber-containing/? ! The most common is 3 layers R'71M with 2 in between.

Sheet 1 is a sheet of high-quality paper, pure white roll paper, plastic filter, etc., 2 is a metal thin film layer such as aluminum or a metal vapor deposition layer, and 1 is an infrared absorber-containing layer;
Sheets 1 and 2 are bonded together by means of adhesive, adhesive, vapor deposition, or the like.

As shown in FIG. 2, another document sheet for preventing copying is a two-layer grooved sheet in which a metal layer or an infrared absorbing agent-containing layer is provided on only one side of the sheet 1.

The infrared absorbent used in the present invention is an Aiso compound having a maximum absorption wavelength in the range of 0.5 to 3.0μ,
Preferred compounds include those shown below.

For example, (1) general formula (wherein R is hydrogen, hydroxyethyl group, or lower alkyl group, and indicates the anion.

A represents +C)7 or -0=, n is an integer of l or 2, and when m is 2, A represents 0.

Specific examples include the following.

(11) (14) (16) (17) (19) (2) General formula % formula % (wherein, Me is Ni, Pd, Pt, R is hydrogen,
It represents a lower alkyl group having 1 to 6 carbon atoms, a phenyl group, an alkyl- or alkoxy-substituted phenyl group, and a chenyl group.

) Specific examples include the following.

(3) General formula (wherein R is H, OCH3, Schiffi-kiru7mi/(:
(Both two are dialkylamino. X represents an anion. In addition to R, the 9-phenyl ring may be substituted with alkoxy or halogen.) The following can be mentioned.

Others include 4-hydroxy-3-(2,4-di-r-minophenylaso)benzenesulfone IF OJ Raman complex, 4-hydroxy-3-(2-hydroxy-1-naphthylazo)benzenesulfmenic acid manganese complex, 4-
Manganese complexes of hydroxy-3'-(2-hydroxy-1-naphthylazo)benzenesulfonic acid and the like may also be used.

(4) General formula [wherein R is an alkyl group having 1 to 5 carbon atoms which may be the same or different (particularly methyl and ethyl), and X- is an anion. ] Examples of the common rod PIJ include the following.

In the present invention, the infrared absorber is mixed with a suitable binder and can be coated using any one of 11 conventional and public methods, such as spraying, electrostatic adhesion, dipping, ILR, +W'J bed coating, grab roll coating, etc. applied to the surface of the image-receiving sheet. Typical binders include, for example, acetylated starch, polystyrene,
butadiene latex, carboxymethyl cellulose,
Polyvinylpyrrolidone, acrylic latex, polyvinegar α
Examples include vinyl copolymers, polyvinyl alcohol, and protein proteins.

Next, an example of creating a copy-protected original used in the apparatus of the present invention will be described.

Example 1 of creating a copy-prevention manuscript 10 parts by weight of a manganese complex of 4-hydroxy-3-(2,4-di7mi/phenylaso)benzenesulfonic acid as an infrared absorber, 1 part by weight of an aqueous solution of 10 parts polyvinyl alcohol
0 Jl meter and water 3゜Ml ball mill l trowel 2
Grind and mix for 4 hours.

Next, 6 parts by weight of acetylated starch was added as a binder to this mixed solution, and this solution was coated on a commercially available Tsubo-ke 642/Zen high-quality paper with an air knife coater to give a coating of 29 parts per 1 (dry weight, hereinafter F). This sheet was coated and dried, and copies were made using a Xerox copying machine to obtain a copy-protected manuscript.

Example 2 The pulp is a mixture of 20 weight percent softwood pulp and 80 weight percent hardwood pulp, with a water content of C and S-F.
, 350- in a pulper refiner and dijordan. This was mixed with 1.5% by weight of rosin rise, 0.5% by weight of sulfate, 0.4% by weight of polyacrylamide, and 8% by weight of talc to make paper f), and paper C was made using a Fourdrinier paper machine. As a surface sizing agent, 0.5% by weight of polyvinyl alcohol (PVA), oxidized starch Q,7, fltN-CH and 0.4% by weight of the pulverized mixture obtained in (1) were mixed at a ratio of 98.4% by weight of water. Approximately 2. Of/rr? After coating and drying, the sheet was copied using a Xerox copying machine and a +1 copy-protected original was printed.

Examples 3 to 7 In the same manner as Shio+32, various infrared absorbers and binders were applied as shown in Table F (on the contrary, the coating method was changed to either an air knife coater or a size brush method, and the results were applied as shown in the table below. Copy-protected manuscripts of Examples 3 to 7 were obtained.

Next, an embodiment of the secure document copy prevention device of the present invention will be described based on the drawings.

EXAMPLE The apparatus of the present invention is shown schematically in FIG.
As shown in the circuit block diagram in the figure, one or more infrared light emitting elements 7 are arranged so as to irradiate near infrared light onto the platen glass 6 side inside the platen cover 5. It is comprised of a light receiving element 8 equipped with a scanning mechanism disposed in the F portion of the platen glass 6, a switch 10 for detecting the position of the light receiving element 8, a display/warning device 16 for indicating that copying is not possible, etc.

Operation of this device u1 See FIGS. 3 to 8 1. .

Let me explain from the start.

In FIG. 3, the infrared light emitting element 7 uses a GL-514 manufactured by Sharp Corporation (!: F
(As shown in the T7 diagram, near-infrared light (peak wavelength 950 questions) is irradiated. Also, as a corresponding light receiving element, a photo diode is also used as sharp?+ [i"! PI) -4
■1 Phantom sensitivity to wavelength when using JPJ is the 8th
It is as shown in the figure.

As shown in the circuit block diagram in FIG.
The oscillation circuit 12 and the light emitting unit driver +-r+11 circuit 11 cause pulse lighting. The reason for pulse lighting here is to improve the light emission output and take measures against disturbance light (sunlight, etc.), so if these problems do not exist, it can be removed from the oscillation circuit.

The output signal of the light receiving element 8 is transmitted by the amplifier circuit 13 as shown in FIG.
After being amplified as shown by X in a) and (b), and converted into the same (2
The signal is sent to the control circuit 15. In the sampling signal generation circuit 20, the reference position detection switch 10 is turned on [,
, the pulse width is set in advance so that the control circuit 15 can be provided with a pulse that coincides with the timing at which the light receiving element 8 faces the infrared light emitting element 7. (Figure 5 (,) and (
(See Z in b)) First, in the flowchart of FIG. 6, when the operator sets the original sheet 4 on the platen glass 6 and turns on the start print switch 19, only the scanning mechanism of the light receiving element 8 operates. The reference position detection switch 10 is turned on by the cam 9. As a result, a preset sampling pulse is sent from the sampling signal generation circuit 20 to the control circuit 15.

First, the signal from the light receiving element 8 is a binary signal Y as shown in Fig. 5 (3K) because the attenuation of infrared light is small in a normal original sheet.
As shown in FIG. 2, the signal almost coincides with the sampler signal 2 and becomes H level, and in this case, copying is started in the normal cohering mode. Next, in the anti-copying sheet, the infrared light is blocked by the infrared absorber and the gold layer, and the binary signal Y remains at the L level as shown in FIG. 5(b). Of course, if there is no sheet, it will be level II, but once it is recognized as level L, a message such as [copy impossible 1] will be displayed or a warning will be displayed to stop the copying operation and make a normal copy. It is something to eliminate.

In the apparatus of the present invention, the number and arrangement of the infrared emitting element 7 and the light receiving element 8 can be changed as appropriate depending on the purpose.

The reference position detection switch 1O may be any other sensor that can be used for position detection, such as an optical sensor or a magnetic sensor.
i't can also be used.

In addition, there are methods other than blocking the copying operation, such as turning off the discharge of the charge transfer corotron or turning off the exposure lamp, and the copying operation will continue, but the copied internal medicine will be 1. Ilj or it may be made indistinguishable.

Furthermore, the scanning mechanism of the light receiving element 8 can also be used in common with an optical system scanning mechanism such as a light lamp.

In addition, copying machines (such as fax machines, etc.
In the case of J, etc., a scanning mechanism for the light receiving element 8 is not necessary.

Note that displays such as "Copy not possible" and government notices are intended to avoid confusion with other malfunctions, so they may be changed or removed if necessary.

Effects of the Invention The confidential document copy prevention device of the present invention has the above-mentioned advantages.
Since the copying operation is stopped when no infrared light from the light emitting unit placed on the platen cover side is incident, copying of the copy-preventing original 7-sheet is of course prevented.
Even in abnormal situations where the platen cover 5 is not closed (or infrared light is not irradiated due to some kind of malfunction), copying can be prevented, and since the copying operation starts after the document surface is detected and determined, paper, etc. is wasted. Furthermore, the detection system and the The device can be manufactured at low cost!: etc. 9'!
There are signs of f.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of an example of a copy-preventing manuscript used in the present invention, FIG. 3 is a schematic diagram of an embodiment of the present invention, and FIG. A circuit block diagram of the device, FIG. 5 is a signal waveform diagram, FIG. 46 is a flowchart explaining the operation of the device of the present invention, and FIG. Graph, FIG. 8 is a graph showing the relative sensitivity of the element example in the same (receptor)'. 3... Copying device; 4... Original sheet; 5
... Graten cover; 6... Platen glass; 7...
・Red 1 light emitting collector: 8... Light receiving element; 9... Cam:
10...) b quasi-position detection switch; 11...
Light emitting unit drive circuit; 12... Oscillation circuit; 13... Amplifying circuit; 14... σ-shaped shaping circuit; 15... Control circuit; 16... Display or TF notification device; 17... Exposure device; 18.--Paper feeding device, etc.; 19.-Start print switch; 2o.-Sampling signal generation circuit. @ 1 sentinel 2 Figure No. 3111 1!5tJj (a) (b) - 1!6tl1 1!7tlW @Figure 8 Uranaga λcm object]

Claims (1)

[Claims] A copying device that prevents the copying of documents bearing information on a support that contains an infrared absorber or a metal, which prevents the copying operation or makes the copied content unreadable or distinguishable when the substance is detected. 1. A confidential document copy prevention device comprising means for starting a control operation to prevent copying of confidential documents.