JP2005158115A - Information recording medium and method of reading its recording section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording object which records information with large reflection differences of light when recording the information other than the one recorded in hologram such as on a hologram label. <P>SOLUTION: The information recording object 1 is made up by sequentially laminating a support object 2, a hologram forming layer 3 having fine asperity 3a of hologram, a metal reflector layer 4, and a diffusing reflector layer 5. And a recording section 4a is contained in the laminated structure to make recording by presence or absence of a metal reflector layer 4. It is made possible to mechanically read the recording by using the mirror reflection of the area having a metal reflector layer 4 and the diffused reflection of the area having no reflector layer. It can be used to read bar codes by reading inversion of black and white. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording body having information that is difficult to tamper with, and also relates to a method of reading a code pattern which is information held by the information recording body.

  For example, credit cards, cash vouchers, and the like that can generate value when used as expensive products with high economic value or ID means often have means for illuminating their authenticity. As a representative means of proving authenticity, a hologram or diffraction grating is labeled (hereinafter referred to as a “hologram” including the hologram or diffraction grating, and a label obtained by labeling them is a “hologram label”. Is often used.

  Hologram labels require high technology for their manufacture, so they originally have high anti-counterfeiting properties, but a large number of hologram labels are already available, and the hologram label manufacturing technology itself is known. For this reason, a higher level of resistance to tampering has been demanded.

A general hologram label is formed by using a relief hologram in which the interference fringes of the hologram are expressed by fine irregularities, and has a laminated structure in which a light reflective layer such as aluminum is laminated in contact with the fine irregularities. Thus, it has been proposed to provide information different from that of the hologram by partially destroying the light reflective layer. (Patent Document 1 and Patent Document 2).
Similarly, it has been proposed to reduce the reflectance of a light reflective layer such as aluminum by various methods including partial removal of the light reflective layer. (Patent Document 3).
JP 2000-47555 A. JP 2000-47556 A. Japanese Patent Publication No. 6-85102.

  According to the inventions described in Patent Literature 1 to Patent Literature 3, visible characters and figures can be applied to the hologram label, but this is insufficient to perform machine reading by applying a barcode or the like. there were. This is because, when performing machine reading, taking a bar code as an example, the difference in light reflectance between a bar (usually a black line) and a space (usually a blank sheet) is large. However, it is difficult to increase the difference in the ratio of the light reflecting layer simply by changing the light reflecting layer, and even if the light reflecting layer is partially removed, the exposed lower layer is smooth. This is because it was difficult to increase the difference in light reflectivity when made of materials.

  Therefore, in the present invention, it is an object to provide an information recording body to which information having a large difference in light reflectance is imparted when imparting information different from that incorporated in the hologram to the hologram label. It is.

  According to the inventor's study, the provision of information itself is provided by forming the opening of the light reflecting layer using a laser beam or the like, and by configuring the diffuse reflective base to be exposed from the opening, It was confirmed that the above problems could be solved, and the present invention could be reached.

  According to a first aspect of the present invention for solving the problem, a diffuse reflection layer is laminated on the metal reflection layer side of a reflection hologram or reflection diffraction grating with a metal reflection layer, and the metal reflection layer is the metal reflection layer. It is related with the information recording body characterized by having the recording part comprised by the presence or absence of.

  According to a second aspect of the present invention, there is provided the information recording medium according to the first aspect, wherein the diffuse reflection layer is an adhesive layer imparted with diffuse reflectivity.

  A third invention relates to the information recording medium according to the first invention, wherein the diffuse reflection layer is a base material provided with diffuse reflectivity.

  According to a fourth invention, in any one of the first to third inventions, the recording section forms a code pattern, and the PCS value of the metal reflection layer and the diffuse reflection layer is 0.45 or more. The present invention relates to a characteristic information recording body.

  According to a fifth invention, in any one of the first to fourth inventions, the code pattern is a two-dimensional code pattern.

  According to a sixth aspect of the present invention, there is provided a recording section of an information recording body comprising: It relates to a reading method.

  According to the first aspect of the invention, the recording portion is configured using the regular reflection property of the metal reflection layer and the diffuse reflection property of the portion where the metal reflection layer is not present and the diffusion reflection layer is exposed. It is possible to provide an information recording body that is highly difficult to rewrite and easy to read.

  According to the second invention, in addition to the effects of the first invention, since the diffuse reflection layer also serves as an adhesive, an information recording body that can be easily applied to other articles can be provided.

  According to the third invention, in addition to the effects of the first invention, the diffuse reflection layer also serves as a base material, so that it is suitable for using as a base material what is already another article, or It is possible to provide an information recording body suitable for application by attaching a string and hanging it on another article.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, the recording part has a code pattern, and the PCS value is defined, so that the readability of the recording part is improved. An excellent information recording body can be provided.

  According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, since the code pattern is a two-dimensional code pattern, it is possible to provide an information recording body having a large amount of information that can be included in the recording unit. it can.

  According to a sixth aspect of the present invention, the recording section of the information recording body according to any one of the first to fifth aspects is read using an existing reader by performing black and white inversion of the reader reading setting. It is possible to provide a method for reading the recording portion of the information recording body.

  FIG. 1 is a schematic view illustrating a laminated structure of a cross section of a basic information recording body of the present invention and a recording state. As shown in FIG. 1, the information recording body 1 of the present invention basically includes a hologram forming layer 3 made of a transparent resin on one surface of a support 2 that is transparent, a metal reflecting layer 4 that is a light reflecting layer, In addition, each of the layers of the diffuse reflection layer 5 having diffuse reflectivity is laminated in order, and among these layers, the hologram forming layer 3 has a relief hologram on the surface opposite to the support 2 side. A reflection hologram is formed with the fine unevenness 3a and the metal reflection layer 4 laminated along the fine unevenness 3a. In addition, as the information recording body 1, it is more convenient to manufacture the information recording body 1 by stacking each layer in order on one surface of the support body 2, and it is preferable to maintain the overall strength. Body 2 can be omitted.

  The metal reflection layer 4 which is a light reflection layer has a recording portion 4a constituted by the presence or absence of the metal reflection layer 4, and usually has a pattern in which openings without the metal reflection layer 4 are provided in a linear shape. In many cases, however, a part of the metal reflective layer 4 is left, and the periphery is patterned as a part without the metal reflective layer 4. In any case, since the recording unit 4a is composed of a portion with and without the metal reflection layer 4, it is very difficult to rewrite the recording of the recording unit 4a inside the information recording body 1. Further, since the recording itself is performed in addition, it is difficult to erase the recording. The recording unit 4a is not necessarily composed of an opening, but in the following, the pattern of the recording unit 4a is a portion where the metal reflection layer 4 is not provided, that is, the opening is provided in a linear shape. Will be described.

  In order to form such a recording portion 4a, any method can be used as long as the method can partially remove the metal reflective layer 4 with a necessary resolution. For example, by a method using a thermal printer or the like. However, as illustrated in FIG. 1, the laser light 7 from the laser light source 6 is used, and if necessary, condensed by an optical system such as an objective lens 8, and recorded on the information recording body 1. It is an optical contact method that is performed by irradiating the metal reflective layer 4 in the previous state and removing the metal reflective layer 4 in the irradiated part, in that the laser light can be narrowed and used. preferable.

  As the laser light, either continuous light (CW light) or pulsed light can be used. The continuous laser beam always maintains the same output for a fixed time, and the pulsed laser beam has a high output for a very short time. Pulse laser light is stored in the laser medium by controlling the output of CW laser light (continuous light) with an external modulator, or by inserting a Q switch into the laser resonator and switching the Q switch. Can be obtained by a method of outputting the generated energy instantaneously. Specific examples of the continuous laser beam include an argon laser, a He-Ne laser, a YAG laser, or a semiconductor laser. A mechanical shutter is used as an external modulator, or an A / O is used as a Q switch. By inserting a modulation element or an E / O modulation element and controlling the Q value of the resonator, pulsed light having a time width of several tens of nanoseconds to several hundred nanoseconds can be generated.

  FIG. 2 is a diagram for explaining the light reflectivity of the recording portion 4a of the information recording body 1 of the present invention. The incident light 11 is applied to the portion of the information recording body 1 having the recording portion 4a where the metal reflective layer 4 is located from the upper side of the support 2 side, so that it is regularly reflected on the surface of the metal reflective layer 4 (upper surface in the figure). Thus, the reflected light 11 ′ reflected in the direction of the target with respect to the perpendicular can be obtained. In addition, by applying incident light 12 having the same angle as that of the previous incident light 11 to the opening without the metal reflection layer 4, it is diffusely reflected on the surface of the diffuse reflection layer 5 exposed in the portion, and various directions are obtained. Thus, the reflected light 12 ′ diffusely reflected toward can be obtained. That is, the reflected light 12 'is a collection of light beams having various directional components.

  When the reflected lights 11 ′ and 12 ′ as described above are obtained, the information recording body 1 is observed from above in FIG. Since no reflected light is observed (or not received), it can be recognized as “OFF state” or “black”, and diffusely reflected light from a portion where the metal reflective layer 4 is not present is observed. (Or received light), it can be recognized as “ON” or “white”. Therefore, the recording unit 4a can be read both visually and mechanically.

  The recording unit 4a may be a character or an arbitrary pattern, but a coded pattern, that is, a code pattern is more effective than a character or pattern that can be read immediately by humans. Since human beings cannot read, it is more preferable in terms of confidentiality of information.

  The code pattern may be a normal barcode, but may be a two-dimensional barcode. Examples of the two-dimensional bar code include a QR (abbreviation for Quick Response) code and a micro QR code. The two-dimensional code pattern has an advantage that a large amount of information can be included in comparison with the size.

  In order to ensure reading of the recording part 4a, it is preferable that the difference in light reflectance between the part with and without the metal reflection layer 4 is large, and in this sense, the PCS value is 0.45 or more. Preferably, it is 0.75 or more. Here, PCS is an abbreviation for Print Contrast Signal. In the case of a barcode, the reflectance of the space (between black lines) is RI, and the reflectance of the bar (black line) is Rd. The PCS value = (RI−Rd) / RI.

  By the way, in the above description, a portion where the metal reflective layer 4 is present is observed or observed as black, a portion where the metal reflective layer 4 is absent is observed as white, and a portion where the metal reflective layer 4 is absent is provided in a linear shape. Since the lines are white and the portions other than the lines are black, black and white are the opposite of normal barcodes. Therefore, when reading the recording unit 4a of the information recording body 1 of the present invention, it is preferable to set the reading setting of the reader (which means a reading machine) in black and white.

  The information recording body 1 of the present invention basically has the above-described configuration, and even a single unit has significance. However, as described below with reference to FIG. It is possible to adopt a mode in which various elements are added.

  FIG. 3 is a diagram showing a more practical form of the information recording body of the present invention. As illustrated in FIGS. 3A and 3B, the information recording body (1A and 1B) of the present invention includes a support 2 and a hologram forming layer 3 in addition to the stacked structure described with reference to FIG. May have a stacked structure in which a release layer 9 is stacked. By interposing the release layer 9, the support 2 and the hologram forming layer 3 can be peeled as necessary. Conversely, there may be a laminated structure having a layer for improving the adhesion between the support 2 and the hologram forming layer 3. At the time of peeling, the peeling layer 9 preferably adheres to the hologram forming layer 3 and peels off, that is, peels between the support 2 and the peeling layer 9, so that the outermost surface after transfer is formed. The release layer 9 is formed of, for example, a mixture of an acrylic skeleton resin, a vinyl chloride-vinyl acetate copolymer, or cellulose acetate, and a thermosetting acrylic resin, melamine resin, nitrocellulose resin, or polyethylene wax. It is preferable that the main component is an acrylic skeleton resin. Alternatively, a polyester resin or the like is preferably used to adjust the adhesion between the release layer 9 and the support 2. Wax or silicon resin may be added in order to obtain releasability. The release layer 9 is prepared by dissolving or dispersing the above resin or the like in an appropriate solvent to prepare a release layer forming coating solution, and the obtained coating solution is applied to the support 2 by a gravure printing method or a screen printing method. Or it can apply | coat by the reverse coating method etc. which used the gravure plate, and can dry and form after application | coating. The thickness of the release layer 9 after drying is 0.1 to 10 μm.

  As shown in FIG. 3 (a), the information recording body 1A of the present invention has an adhesive layer (hereinafter referred to as shrinking) in which the diffuse reflection layer 5 described with reference to FIG. 1 and FIG. It may be referred to as a diffuse reflective adhesive layer). In this case, the release layer 9, or the support 2 and the release layer 9 can be omitted. As described above, the information recording body 1A having the diffuse reflective adhesive layer 5A can be applied by utilizing the adhesiveness of the diffuse reflective adhesive layer 5A when applied to another article (not shown). In addition, the diffuse reflection property of the diffuse reflection adhesive layer 5A enables the recording unit 4a to be read by the action described above.

  Various adhesives can be used as the adhesive that constitutes the diffuse reflective adhesive layer 5, but industrially, it is preferable to use a heat-sensitive adhesive or a pressure-sensitive adhesive. When a heat-sensitive adhesive is used as the adhesive, the information recording body 1A can be attached by bringing the diffuse reflective adhesive layer 5A side into contact with the article and heating. Further, it can be applied to an article by a so-called transfer method in which the support 2 is peeled off at the same time as or after the pasting.

  As shown in FIG. 3 (b), the information recording body 1B of the present invention is a base material (hereinafter referred to as shrinking and diffusing) to which the diffuse reflection layer 5 described with reference to FIG. 1 and FIG. It may be 5B. The substrate 5B may be any material, but preferably has a certain degree of rigidity, and more preferably has a plate shape. In the case of having the diffusely reflective substrate 5B, the release layer 9, or the support 2 and the release layer 9 can be omitted. The information recording body 1A having the diffuse reflective adhesive layer 5A described with reference to FIG. 3A is used by applying to other articles, but this FIG. 3B. The information recording body 1B of the example described with reference to the above can be used alone, or can be applied to other articles by being configured like a hanging tag with a string or the like attached thereto.

  The material constituting each layer of the information recording body 1 of the present invention, the method of forming the layer, and the like will be described below.

  In the normal manufacturing method of the information recording body 1, the support body 2 is an object for forming each layer. The formation of each layer is usually performed by printing or coating. At that time, the layers have the required mechanical strength, have heat resistance and solvent resistance, and have the information recording body 1 attached thereto. It is preferable to have heat resistance required when applied to other articles by transfer, particularly thermal transfer. Therefore, it is preferable to use various plastic films having these performances as the support 2. For example, a biaxially stretched polyethylene terephthalate film (hereinafter simply referred to as a PET film) can be used. When using a PET film as the support 2, the thickness is preferably 5 μm to 250 μm, and more preferably 10 μm to 50 μm in view of the above-mentioned necessary characteristics, workability, thermal efficiency during thermal transfer, and the like. An intermediate layer may be interposed on the hologram forming layer side of the support 2 for the purpose of improving the adhesion between them.

  The release layer 9 that can be provided between the support 2 and the hologram forming layer 3 comprises an acrylic skeleton resin, vinyl chloride-vinyl acetate copolymer, cellulose acetate and thermosetting acrylic resin, melamine resin, nitrocellulose resin, and polyethylene wax. It can comprise using raw materials, such as a mixture.

  The hologram forming layer 3 is a layer made of a transparent resin in which fine irregularities of the hologram are formed. As the transparent resin, a thermoplastic resin such as polyvinyl chloride, acrylic resin, polystyrene, or polycarbonate, unsaturated polyester, melamine In addition, thermosetting resins such as epoxy and acrylate can be used alone or in combination with the above thermoplastic resin and thermosetting resin. As the transparent resin, an ionizing radiation curable resin composition obtained by individually or arbitrarily mixing an ionizing radiation curable resin, oligomer, or monomer can be used. Lamination of the transparent resin layer to the support 2 can be performed by a known coating method. The film thickness of the hologram forming layer is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 1 μm to 4 μm.

  The fine irregularities of the hologram can be formed by exposing the layer of ionizing radiation curable resin composition using the interference light when creating the hologram, and performing the necessary development after the exposure. It is also possible to form by replicating by plating, contacting the layer made of the transparent resin using the replicated material, and molding.

  The metal reflection layer 4 is a layer for increasing the diffraction efficiency due to the fine unevenness of the hologram forming layer 3, and is made of aluminum (Al), zinc (Zn), indium (In), gold (Au), silver (Ag), cobalt. (Co), tin (Sn), selenium (Se), titanium (Ti), iron (Fe), tellurium (Te), copper (Cu), lead (Pb), nickel (Ni), palladium (Pd), etc. These metals can be used alone or an alloy thereof.

  Examples of the method for forming the metal reflection layer 4 include thin film formation methods such as vacuum deposition, sputtering, or ion plating. The thickness of the metal reflective layer 4 may be appropriately set according to the color tone, design, use, etc., but is preferably in the range of 50 to 1 μm, and more preferably 100 to 1000 mm. When it is desired to provide a colored reflective layer having transparency, the thickness of the metal reflective layer 4 is preferably less than 200 mm. When it is desired to provide a colored reflective layer having a concealing property, the thickness of the metal reflective layer 4 is desirably 200 mm or more. As described above, the thin film can be set according to needs such as color tone, concealment property or transparency in consideration of the use of the transfer foil and the total design.

  By the way, in the case of a general barcode composed of an array of black lines, the background of the black line is usually white, so if you try to superimpose a general barcode on the hologram image, it will be white on the hologram image. There is a problem that it is necessary to form an area and form a barcode thereon, which impairs the visibility of the hologram image in the portion where the white area is formed. Each line of the recording unit 4a of the information recording body 1 of the present invention has a hologram image as a background, but the background part reflects the incident light regularly and each line part diffusely reflects, so that the distinction is made. Therefore, it is not necessary to provide anything that hinders the visibility of the hologram, such as a white area. Moreover, since the lines themselves constituting the recording unit 4a have a small area, the visibility of the hologram image is not substantially impaired. However, since each part constituting the hologram causes different diffraction, it is preferable to consider the design of the hologram so that the reflected light does not go to the position where the diffuse reflected light is read when reading as described above.

The diffuse reflection layer 5 is for diffusely reflecting incident light, and is made of a material containing a diffuse reflective material at least near the surface. Titanium white (TiO ₂ ) recognized as a white pigment, calcium carbonate, magnesium carbonate, magnesium hydroxide, aluminum hydroxide, zinc hydroxide, zinc oxide, aluminum oxide, silicon dioxide, amorphous silica Inorganic pigments such as barium sulfate, kaolinite, or talc, or organic pigments such as styrene and acrylate esters, and the particle size of the diffusely reflective material is preferably 0.05 μm to 10 μm, and more Preferably they are 0.1 micrometer-5 micrometers. If the particle size is less than 0.05 μm, the diffuse reflectance is insufficient, and if it is 10 μm or more, the printability is lowered. In terms of sufficient diffuse reflectance and high printability, the thickness is 0.1 μm to 5 μm. An anchor layer may be interposed for the purpose of improving the adhesion between the diffuse reflection layer and the upper layer.

  When the light source for reading the recording unit 4a is a white light source, the diffuse reflective material is preferably a white pigment as described above. However, depending on the light source for reading the recording unit 4a, a material other than the white pigment is used. You can also. For example, an LED having a wavelength of 660 nm is often used as a light source of a bar code reader that reads a general bar code. Therefore, the information recording medium of the present invention is used by using a bar code reader having such an LED as a light source. When reading one recording unit 4a, the diffuse reflective material may be a yellow pigment or a red pigment.

  The diffuse reflective layer 5 may be a diffuse reflective adhesive layer 5A constituted by a heat-sensitive adhesive or pressure-sensitive adhesive in which the above diffuse reflective material is dispersed.

  Examples of the heat-sensitive adhesive that can constitute the diffuse reflective adhesive layer 5A include ethylene / vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene / isobutyl acrylate copolymer resin, butyral resin, and polyvinyl acetate. And its copolymer resin, cellulose derivative, polymethyl methacrylate resin, polyvinyl ether resin, polyurethane resin, polycarbonate resin, polypropylene resin, epoxy resin, or phenol resin, and heat such as SBS, SIS, SEBS, or SEPS. Examples thereof include those made of a plastic elastomer or a reactive hot melt resin. The information recording body 5A configured using the heat-sensitive adhesive as described above has a form of a heat-sensitive label or a heat-sensitive transfer sheet to be applied by heating, and is therefore suitable for being attached to various articles. In addition, when using resin which can become these heat-sensitive adhesives, a simple diffuse reflective coating may be formed and not used as an adhesive.

  Examples of the pressure-sensitive adhesive that can constitute the diffuse reflective adhesive layer 5A include acrylic resins (including copolymers), acrylic ester resins (including copolymers), styrene / butadiene copolymers, polyester resins, Vinyl chloride / vinyl acetate copolymer, natural rubber, casein, gelatin, rosin ester, terpene resin, phenol resin, styrene resin, chromanindene resin, polyvinyl ether resin, silicone resin, α-cyanoacrylate resin, silicone resin Examples thereof include resins, maleimide resins, styrene resins, polyolefin resins, resorcinol resins, polyvinyl ether resins, and silicone resins. When the diffuse reflective adhesive layer 5A is formed using an adhesive, it is preferable to laminate a release sheet on the adhesive layer for protecting the adhesive layer. As the release sheet, paper or plastic is used. What gave the mold release process to a film can be used. Thus, since the information recording body 5A comprised using an adhesive has a form of a label, it is suitable for sticking to various articles | goods.

  The diffuse reflective layer 5 may be a diffuse reflective base material 5B composed of a transparent resin in which the above diffuse reflective material is dispersed. For example, fine paper, coated paper, mirror coated paper, OCR paper, coated card paper, etc., preferably white paper, yellow paper, red paper, or polyester resin such as polyethylene terephthalate resin, polycarbonate resin, ABS A resin film (including a sheet or a plate) made of a resin, a polyvinyl chloride resin, or the like, in which a reflective substance such as each layer is dispersed.

  What the diffuse reflective layer 5 is the diffuse reflective base material 5B is a laminated structure suitable for applying the present invention using an article configured for another purpose as a base material. In particular, in the case of ID certificates (passports, driver's licenses, etc.) which are means for identity verification (ID), the base materials of those ID certificates can be used as they are. In application, it is preferable to use an adhesive as needed, and it is preferable to use an adhesive that has transparency and at least does not impair the diffuse reflectivity of the lower diffuse reflective substrate 5B. Of course, the information recording body (FIG. 3A), in which the diffuse reflective layer 5 is the diffuse reflective adhesive layer 5A, is adhered to the ID certificate substrate using the diffuse reflective adhesive layer 5A. You can also. Of course, the diffuse reflective layer 5 that is the diffuse reflective base material 5B can be used as it is, but it can be applied to other articles by attaching a string-like one and suspending it on the other article. You can also.

  The recording unit 4a of the information recording body 1 of the present invention has been illustrated as being possible to be a character, an arbitrary pattern, or a code pattern, but may be accompanied by information other than these forms, for example, a normal means The letters, numbers, patterns, etc. formed by These are preferably formed on the observation side of the metal reflection layer 4 within a range that does not interfere with observation or observation of the recording portion 4a. When the information recording body 1 of the present invention is accompanied by the diffusely reflective substrate 5B, letters, numbers, patterns, etc. formed by ordinary means may be formed on the observation side with respect to the metal reflective layer 4. In addition, the diffusely reflective base material 5B may be formed at a position where the information recording body 1 is not necessarily applied. Here, the information included in the characters, numbers, patterns, etc. formed by the normal means may not be related to the information stored in the recording unit 4a, but is preferably related. .

  The information recording body 1 according to the present invention includes (1) various products for which authentication of genuine products is significant, such as printer consumables, electronic devices, electrical devices, computer products, pharmaceuticals, or chemicals, and (2) products themselves. Luxury brand products that consumers are strongly required to be genuine, such as watches, clothes, bags, jewelry, sports equipment or cosmetics, (3) identity verification means (ID card), such as passports, driving License, insurance card, library card, etc. (4) It is valuable when used for applications such as gift certificates, gift certificates, prepaid cars, etc. that are required to be genuine in order to maintain economic order. high.

Apply UV curable resin composition to PET film, irradiate with UV light while keeping mold surface of relief hologram replication mold in contact with application surface, and then peel off to mold fine irregularities of relief hologram It was. An aluminum thin film was formed to a thickness of 500 mm on the side of the replicated relief hologram having fine irregularities, a metal-colored reflective layer was formed, and an adhesive in which TiO ₂ was dispersed as a white pigment was applied. Sepa paper (release paper) was laminated to produce a hologram label.

  From the PET film side of the obtained hologram label, using a 5 W light source, a YAG laser beam having a wavelength of 1064 nm and a beam spot size of 50 μm is condensed on the reflection layer using an objective lens, By partially destroying a part, a QR code in which an expiration date and a lot number were encoded was printed, and an information recording body of the present invention was obtained. However, because the portion of the reflective layer corresponding to the black portion when printing on white paper was destroyed, the lower white adhesive layer was seen from the destroyed portion, resulting in a QR code with black and white reversed.

  Using the code reader system consisting of a two-dimensional code scanner (manufactured by Denso Wave Co., Ltd., QS20P) and a personal computer, the optical reading setting of the two-dimensional code scanner is set to “monochrome inversion mode”. As a result, it was possible to display the information on the incorporated expiration date and lot number on the screen.

  The same procedure as in Example 1 was performed except that a transparent adhesive was used, and the same result as that for the hologram label of Example 1 was obtained.

  A hologram label is manufactured in the same manner as in Example 1 except that the expiration date and lot number are printed in two forms of QR code and ordinary characters, and read in the same manner as in Example 1. The expiration date and lot number information included in the QR code is displayed on the screen. Ordinary characters are read using a CCD camera and displayed on the screen. I was able to confirm that there was.

It is a schematic diagram which illustrates the structure of the basic information recording body of this invention, and a recording system. It is a schematic diagram explaining the light reflectivity of a recording part. It is a schematic diagram which shows the more practical structure of an information recording body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information recording body 2 ... Support body 3 ... Hologram formation layer 4 ... Metal reflection layer (4a; Recording part)
5 ... Diffuse reflection layer (5A; adhesive layer, 5B; substrate)
9 …… Peeling layer

Claims (6)

  A diffuse reflection layer is laminated on the metal reflection layer side of a reflection hologram or a reflection diffraction grating with a metal reflection layer, and the metal reflection layer has a recording part configured by the presence or absence of the metal reflection layer. An information recording medium characterized by   The information recording body according to claim 1, wherein the diffuse reflection layer is an adhesive layer imparted with diffuse reflectivity.   The information recording body according to claim 1, wherein the diffuse reflection layer is a base material provided with diffuse reflectivity.   The information recording body according to any one of claims 1 to 3, wherein the recording unit forms a code pattern, and the PCS value of the metal reflection layer and the diffuse reflection layer is 0.45 or more. .   5. The information recording body according to claim 1, wherein the code pattern is a two-dimensional code pattern. 6. A method for reading a recording portion of an information recording body, wherein reading of the recording portion of the information recording body according to claim 1 is performed by reversing a reader reading setting in black and white.

Images