JP2584681B2 - Recording method and recording material - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for recording image information, and more particularly to a method for recording image information in which the reflectance in the visible light region and the reflectance in the infrared region are limited to specific ranges. The present invention relates to a recording method and a recording material used for the recording method.

(Conventional technology and its problems) Conventionally, bank passbooks, checks, air tickets, road tickets, tickets, admission tickets, horse voting tickets, prepaid cards, such as telephone fee cards, ticket purchase cards, and admission tickets Cards related to automatic payment such as purchase cards, play fee cards, identification cards, bank deposit number cards, etc., letters, numbers, symbols, patterns, etc. Sometimes it is necessary to conceal so as not to be done, and in many cases, magnetic ink has been used.

However, in a system using magnetic ink, there is a problem that the magnetic strength changes or disappears when the magnetic material used is exposed to heat or placed in an environment with a strong magnetic field. In addition, there is a problem of alteration or falsification such as changing or reproducing magnetic recording.

Accordingly, there is a need for a method of recording image information that allows entry of information, recording, and the like to be performed easily and easily, and that allows altered or falsified tickets and cards to be found.

(Means for Solving the Problem) The present inventors have completed the present invention as a result of intensive studies in order to solve the above-mentioned problems of the prior art.

That is, the present invention provides a method of recording image information on a substrate using a black-to-dark recording material, wherein the reflectance of the image in a visible light region is about 10% or less, and the reflectance in an infrared region is Is about 15% to 50%, and a recording material used for the recording method.

Preferred Embodiment Next, the present invention will be described in more detail with reference to preferred embodiments.

As the substrate used in the present invention, for example, paper,
Conventionally well-written or recordable substrates such as synthetic paper with synthetic fibers, synthetic paper, plastic film, plastic sheet and the like are used. The shape used is in addition to each size of the standard,
The size of the cut card is not particularly limited.

Any of the methods for recording information on the above-described substrate using a recording material described later may be a conventionally known method.

For example, in the related art, a method of recording and writing image information such as characters, numbers, symbols, and patterns is determined by an image forming mechanism of a unit such as a recording device used.

For example, conventionally known recording methods such as a thermal transfer method, an ink jet printing method, an electrostatic recording method, and an impact printing method using a colored ribbon can be used.

The recording material used in the recording method of the present invention will be described.

The recording material of the present invention exhibits a black to dark color, has a reflectance of about 10% or less in the visible light region of the image, and has a reflectance of about 15 to 50% in the infrared region, and has an infrared absorption property. It contains a functional black pigment and an infrared reflective black pigment.

Although the method of the present invention utilizes information under visible light and information under infrared light, it is generally not easy to recognize that information under infrared light is contained and to identify it.

If image information such as letters, numbers, symbols, and patterns of various tickets and cards is to be altered or falsified, various writing instruments and recording materials will be used. Generally, the pigments used for them are water-soluble dyes or oil-soluble dyes or pigments such as carbon black. The reflectance of the water-soluble dye in the visible light region is about 10% or less,
The reflectance in the infrared region was about 60% or more. The reflectance of the oil-soluble dye in the visible light region was about 10% or less, but the reflectance in the infrared region was 10% or less and 60% or more. In addition, pigments such as carbon black had a reflectance in the visible light region and a reflectance in the infrared region of about 10% or less.

Therefore, the recording material of the present invention has a reflectance in the visible light region of the image of about 10% or less and a reflectance in the infrared region of about 15% to 50% to prevent the above-mentioned alteration and tampering by the infrared ray. The reflectance in the region can be identified and sorted as a signal.

As described above, this property is achieved by mixing an infrared-absorbing black pigment and an infrared-reflecting black pigment, and using this as a colorant for a recording material.

An infrared-absorbing black pigment means that it has sufficient absorption of visible light in the visible light region, and also has large absorption in the infrared region used for detection, and therefore has a clearly low reflectance in the infrared region. is required. Any conventionally known pigment having such properties can be used,
Particularly preferred are, for example, carbon black black pigments, aniline black black pigments, iron oxide black pigments, and baked pigment black pigments such as spinel type structure pigments. In addition, the infrared-reflective black pigment means that while having sufficient absorption of visible light in the visible light region, it has a large reflection in the infrared region used for detection, and therefore has a high reflectance in the infrared region. is necessary.

Conventionally known pigments having such properties can be used, and particularly preferred are, for example, black pigments prepared by mixing and mixing azo black pigments or chromatic pigments.

Among the above azo black pigments, azo black pigments having a residue having an azomethine group represented by the following general formula in the molecule are particularly preferable.

(Where Ar is a residue of an aromatic or heterocyclic compound, X is a hydrogen atom or a halogen atom,
Is an integer of 1 or 2 or more due to the substitution position of Ar. For example, an azo black pigment having an azomethine group using 2-hydroxy-α-benzocarbazole-carboxylic acid arylamide and its derivative as a coupling component disclosed in JP-A-62-32149 is particularly preferred. Under the visible light range, the black color was clear and high in blackness. However, it showed high reflection for infrared rays.
Further, it has excellent heat resistance, light resistance, water resistance, chemical resistance, and solvent resistance, and has higher coloring power.

In the present invention, "infrared reflective" refers to the case where the substance itself reflects infrared light, and the substance itself transmits infrared light. It also means transmitting infrared light.

The content of the colorant contained in the recording material of the present invention needs to be changed depending on the type of the recording material and the film thickness, particle thickness, droplet amount, etc. printed or printed on the substrate. However, the content of the infrared absorbing black pigment is about 0.2 to 3% by weight for carbon black and organic black pigments, and about 0.5% to 8% by weight for inorganic black pigments. Rank.

Further, the content of the above-mentioned infrared-reflective black pigment used as a mixture with the pigment must be used so that the image recorded by the recording material has a reflectance in the visible light region of about 10% or less. It is about 3 to 15% by weight, and is often used when the content of the infrared absorbing black pigment is small.

The recording material of the present invention is used in the same configuration as a conventionally known recording material. For example, thermal transfer ribbons or films, aqueous and oil-based inkjet inks, dry and wet developers for electrostatic recording, colored ribbons for impact printing, and the like.

The resin components, additives, solvents, water, and the like used for these may be any of those conventionally used for such recording materials.

The method for producing the recording material is also the same as the method for producing that type of recording material.

As described above, for the absorption of visible light of image information such as formed letters, numbers, symbols, and patterns, that is, low reflectivity and a limited degree of reflectivity to infrared light, light in the visible light region is used. It is possible to identify and confirm a combination of a reader, a photograph, etc., which have been used, and a reader, an infrared photograph, etc. using light rays in the infrared region. For example, a reader using a light beam has a visible light range of 500 to 600 nm or 620 nm.
~ 650nm filter light, 890 in infrared region
A semiconductor laser that emits near-infrared light of up to 930 nm is used.
Irradiation is performed with these infrared rays as they are or with modulation to increase the sensitivity of light reception. Next, the degree of reflection at a portion where image information is recorded on a substrate, for example, paper or a card, is received by a light receiving sensor and converted into an electric signal indicating the degree. This electric signal is connected to various recognition methods and recognized as clear image information. If the level deviates from a preset level, for example, lighting of a warning light, generation of an alarm sound, generation of a synthesized voice, display by a cathode ray tube, recording by a recorder or a printer, display by operation of a motor, etc. Alternatively, it may be a separation of tickets or cards or a stop of a confirmation operation, or a combination thereof.

(Operation / Effect) According to the recording method of the present invention as described above, the formed recording information and the writing implement or the recording material which will be used when the recording information is tentatively falsified or falsified are reflected by the infrared reflection. A difference in the degree of the reflectance is provided so that it can be identified as correct only at an intermediate level where the reflectance is neither high nor low.

Therefore, even if image information such as characters, numbers, symbols, and patterns is altered or modified, it is very useful as a recording method that is easy to find.

Further, it can be used in combination with a system using magnetic ink.

(Examples) Next, the present invention will be specifically described with examples.
In the following description, parts are based on weight unless otherwise specified.

Example 1 2.02 parts of carbon black pigment and 3- (4'-aminophenylimino) -1-oxo-4,5,6,7-tetrachloroisoindoline were diazotized to give 2-hydroxy-α-benzocarbazole- Black azo pigment having an azomethine group obtained by performing a coupling reaction with 3-carbo- (2'-methyl-4'-methoxy) anilide 11.4
8 parts 39.25 parts ester wax, paraffin wax
Using a binder of 39.25 parts, 5 parts of a styrene-methacrylate copolymer resin and 3 parts of silica, a polyester film was applied to a thickness of about 3 μm according to a conventional method. It was cut into a width of 6 mm to obtain a black thermal transfer recording ink ribbon. This was loaded in a thermal transfer recording device, and thermal transfer was performed.
In order to check the properties of the thermal transfer image from the thermal transfer ink ribbon to visible light and infrared light, the reflectance between the visible part and the near-infrared part was measured with a self-recording spectrophotometer. The reflectance at each wavelength was as shown in the table below.

In the above table, wavelengths are given in nm. The reflectance was measured by contacting an alumina white plate from the back.

The above results show that in the visible part, the reflectance is less than 5% and the light is absorbed with little reflection, and the color is black, but in the near infrared part, the reflectance is 32% to 35% and the light is absorbed and reflected. Occur together, thus indicating an intermediate reflection.

For comparison, a commercial black writing instrument was used for drawing, and the reflectance in the visible to near infrared region was measured in the same manner as described above.

As a writing instrument, a fiber pen, a ball pen and a fountain pen were used for oil-based ones, and a fiber pen, a ball-point pen and a fountain pen were used for water-based ones.

As a result of the measurement, the reflectance in the visible portion was 10% or less, but the reflectance in the infrared portion was determined by the properties of the pigment used.
It was divided into two types: those having a reflectance of 10% or less and exhibiting almost no reflection and causing absorption, and those having a high reflectance of about 65% or more and having a low degree of absorption.

Also, as described below, by reflection in the infrared region,
When the thermal transfer image from the thermal transfer ink ribbon and the image drawn using the writing instrument were read by an infrared reader divided into three stages of medium and low, each image was read in the infrared portion described above. Each section signal was provided based on the magnitude of the reflectivity.

The above infrared reader is 890 ~ 9 by semiconductor laser.
Generates near-infrared light of 30 nm, irradiates it in a form that modulates it and increases the sensitivity of light reception, and the degree of reflection from an image record that has a preset reflectance on a ticket or card as optical information Is received by a light-receiving sensor, and the optical information is converted into electrical information. The electrical information indicates that the reflectance of image information such as letters, numbers, symbols, and patterns is approximately 10% or less, and 15% or less. % To 50% and 60% or more are distinguished by a discriminating circuit, and the result is linked to the lighting of a warning light and the generation of a warning sound.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-92486 (JP, A) JP-A-63-144075 (JP, A) JP-A 64-18692 (JP, A) 111462 (JP, A) Hikaru 3-114871 (JP, U)

Claims (4)

(57) [Claims] 1. A method of recording image information on an arbitrary substrate using a black to dark recording material, wherein the reflectance of the image in a visible light region is about 10% or less, and the reflectance in an infrared region is not more than 10%. A recording method characterized by being about 15% to 50%. 2. An infrared absorbing black pigment selected from the group consisting of carbon black black pigment, aniline black black pigment, iron oxide black pigment and calcined pigment black pigment as a colorant, and an azo based recording material. The recording method according to claim 1, further comprising an infrared reflective black pigment selected from the group consisting of a black pigment and a black pigment obtained by mixing a chromatic pigment. 3. The recording method according to claim 1, wherein the recording material contains, as a coloring agent, carbon black and an azo black pigment having in the molecule a residue having an azomethine group represented by the following general formula. (Where Ar is a residue of an aromatic or heterocyclic compound, X is a hydrogen atom or a halogen atom,
Is an integer of 1 or 2 or more due to the substitution position of Ar. ) 4. An infrared absorbing black pigment, an azo black pigment and a black pigment selected from the group consisting of carbon black black pigments, aniline black black pigments, iron oxide black pigments and calcined pigment black pigments as colorants. A recording material containing an infrared-reflective black pigment selected from the group consisting of black pigments obtained by mixing coloring pigments, wherein the recording material has a reflectance of about 10% or less in a visible light region of an image, and an infrared ray. A recording material having a reflectance in a region of about 15 to 50%.