JP2010131878A - Information recording body and information recording method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording body which enables easy recording of visually observable information such as information on two or more images which change by angles from where they are seen, image information which is recognizable as a solid picture, image information in characters, numerals and patterns, and to provide an information recording method thereof to record those information on an information recording body. <P>SOLUTION: The invention is to provide the information recording body which has a coloring stratum that either develops colors or changes colors by at least an irradiation with light of a specific strength or more, and a stratum of lens assembly, and this stratum of lens assembly is of a construction where the unit cells having lens capability of light concentration are arranged next to each other without gap in-between and, further, the coloring stratum is placed on the side where the light incident on to the stratum of lens assembly is condensed. Additionally, the invention is also to provide an information recording method which records information in the information recording body by the specific angled irradiation with light and the information is only observable from that specific angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information recording body and an information recording method using the same, and in particular, the information recording body is modified by irradiating light such as laser light so that three-dimensional characters, numbers, pictures, biometrics information, etc. The present invention relates to an information recording body capable of recording information including image information and an information recording method such as stereoscopic image information using the information recording body.

  In recent years, laser engraving technology that directly enters individual information directly into cards, passports, and the like has attracted attention. Laser engraving technology is an effective technology for building a more robust social system that can improve safety and durability in terms of preventing falsification and alteration of individual information.

  Laser engraving technology is a technology that engraves information directly into the material by changing the characteristics of the material itself such as cards. This is because it is imprinted on the inner layer of the card, or because the black layer is printed inside the card and printed, the durability of the engraved information against organic solvents and chemicals such as thinner is increased. Forgery and falsification can be made difficult.

  The information includes characters, numbers, pictures, biometrics information such as image information such as fingerprints, faces, blood vessels, and the like, which can be used as individual information for identifying an individual.

  Furthermore, by embedding various IC chips in a card or the like subjected to laser engraving technology and linking with an information system, an advanced security system can be realized (Patent Document 1).

  As one of laser engraving technologies, a method for recording individual information using a laser is, for example, selectively irradiating a layer having a diffractive element structure with a reflective layer behind it and reflecting it. A method of adding individual information by destroying a layer is known (Patent Document 2).

  As an example of another laser engraving technique, a layer other than the hologram recording layer of the volume hologram is irradiated with laser light, and the layer is physically or chemically modified to additionally record individual information. (Patent Literature 3, Patent Literature 4, Patent Literature 5).

  As mentioned above, the conventional laser engraving technology usually writes individual information by modifying the surface layer of the card and the inside of the card substrate by optical processing technology such as laser, so it is durable. It is generally used because it has excellent tamper resistance and can additionally record information. However, in terms of the quality of image information, these are all two-dimensional and record single image information. Met.

  The display quality of information using such a conventional information recording body on which two-dimensional and single image information is recorded is visually different from that of the melted character printing information by the melting ribbon, the sublimation transfer method, and the ink jet method. The display quality was almost the same as the printed image.

That is, more image information that is closer to reality and has a larger amount of information, such as a three-dimensional stereoscopic image, and more image information such as a plurality of two-dimensional image information can be visually observed on an information recording medium. It was not possible to record so that it could be confirmed at a glance.

  Image information with a large amount of information as described above can be used to record individual information as biometric information such as image information of the fingerprint, face, blood vessel, etc. Could be applied, but was not provided.

  In addition, when individual information is recorded on a relief diffractive structure having a function of a conventional relief diffractive element or a security information recording body using a volume hologram or the like, the space for recording the individual information is limited. Therefore, it has been impossible to record more detailed individual information or more individual information so that it can be confirmed with a glance.

On the other hand, as a method for recording a plurality of pieces of image information, for example, a print pattern that uses the magnifying effect of a lenticular lens and takes into account the focus movement by changing the observation angle is placed near the focal length of the lens at a lens pitch with high positional accuracy. A method of recording a plurality of image information and stereoscopic image information by printing is known. (See Patent Document 6)
In particular, if a method of directly printing on the focal plane of the lenticular lens by the ink jet printing method is used, it is possible to respond to so-called on-demand recording that can present a stereoscopic image as soon as required. Become.

  However, in the method as described above, there is a problem of improving the positional accuracy and pitch accuracy of the printing pattern of the lens on the lenticular sheet which is the material of the lenticular lens. In particular, in order to record high-resolution image information such as photographs, positional accuracy in units of μm is required. However, this implementation is technically difficult and often causes deviations. As a result, there is a problem in that the yield of product production is low and the productivity is very low.

A method for solving such a problem of the printing pattern of the lens by combining a lenticular lens and a photosensitive film and performing scanning exposure from the lenticular lens side is known (for example, Patent Document 7). The public information does not explain the details of the photosensitive film. However, in general, when a photosensitive film is used, it is necessary to perform each processing such as development, fixing, and printing after exposure, which is complicated. Therefore, it can be said that it is not suitable for on-demand recording, in which image information such as a facial photograph is recorded and displayed as soon as requested.
JP 2006-103221 A JP 2000-47556 A JP 2002-32724 A JP 2007-304377 A JP 2007-105732 A JP 2008-15048 A JP-A-8-220477 Japanese Patent Laid-Open No. 3-198003 JP 2000-75106 A JP 2000-131505 A

  The present invention has been made in view of the above circumstances, and can be visually observed, a plurality of pieces of image information that varies depending on the viewing angle, image information that can be recognized as a three-dimensional image, letters, numbers, and patterns. It is an object of the present invention to provide an information recording body capable of easily recording such information.

  In addition, the present invention records information such as text information, characters, numbers, and patterns on the information recording body so that different images can be viewed by changing the viewing angle when the observer views the information recording body. An object is to provide an information recording method.

  The present invention also provides an information recording method for recording image information that can be recognized as a three-dimensional image and information such as letters, numbers, and patterns on the information recording body when an observer views the information recording body. It is an issue to do.

  The present invention solves such a problem, and the invention according to claim 1 for solving the above-described problem causes color development or color change at least by irradiation with light having a specific intensity or more. An information recording medium having a color developing layer and a lens assembly layer, wherein the lens assembly layer has unit cells having a lens function having a light condensing function arranged adjacent to each other in a planar manner so that there is no gap. Further, the information recording body is characterized in that the coloring layer is arranged on a side where light incident on the lens assembly layer is collected.

  The invention according to claim 2 is an information recording body, comprising a focal length adjusting layer for making a lens focal position of the lens assembly layer be a position of the color developing layer, and the focal length The information recording body according to claim 1, wherein an adjustment layer is disposed between the color forming layer and the lens assembly layer.

  A third aspect of the present invention is an information recording body, wherein at least one of the lens assembly layer and the focal length adjustment layer is partially arranged in an arbitrary pattern. Item 3. The information recording material according to Item 1 or 2.

  The invention according to claim 4 is an information recording body, wherein at least a lens assembly layer is disposed, then a focal length adjusting layer is disposed, and then a color developing layer is disposed, and the focal length adjusting layer and the focal length adjusting layer are disposed. A relief type diffractive structure having the function of a relief type diffractive element is formed on at least a part of the color developing layer, and at least a part of the surface including the part on which the relief type diffractive structure part of the color developing layer is formed. The information recording body according to claim 1, wherein a reflective layer is disposed.

  The invention according to claim 5 is an information recording body, wherein at least a lens assembly layer is arranged, at least a color developing layer is arranged, and then a relief type diffractive structure layer having a function of a relief type diffractive element is provided. The information recording body according to claim 1, wherein the reflective layer is disposed on at least a part of a surface on which the relief type diffractive structure layer is disposed.

  The invention according to claim 6 is an information recording body, wherein a volume hologram layer is disposed as one of the layers disposed below the surface opposite to the light irradiation side of the lens assembly layer. The information recording body according to claim 1, wherein the information recording body is a recording medium.

  According to a seventh aspect of the present invention, in the coloring layer, the light transmittance of the coloring layer before being irradiated with the light is 50% or more, and the wavelength of the light is in the range of 360 nm to 830 nm. It is an information recording body of any one of Claims 1-6 characterized by these.

  The invention according to claim 8 is the information recording body according to claim 1, wherein the light according to claim 1 is a laser beam.

In the invention according to claim 9, by the light condensed by the light condensing effect of the lens assembly layer,
9. The method of recording information on an information recording body according to any one of claims 1 to 8, wherein the coloring layer is colored. By irradiating light from two or more angles with respect to the plane, information of images that can be confirmed only at the light irradiation angles of the plurality of angles is recorded on the same information recording body. An information recording method characterized by the above.

  According to a tenth aspect of the present invention, the color developing layer is colored by the light condensed by the condensing effect of the lens assembly layer. The information according to any one of the first to eighth aspects, An information recording method for a recording body, wherein an irradiation angle of light with respect to a virtual plane composed of apexes of each unit cell of the lens assembly layer is composed of two angles assuming both eyes of an observer at an observation point, By irradiating light from each angle and recording information of the image corresponding to each angle as a pair of parallax image information, parallax can be obtained when the viewer visually recognizes the pair of parallax image information with both eyes. The information recording method is characterized in that it is obtained and can be recognized as a stereoscopic image.

  The invention according to claim 11 is an information recording method on an information recording body, wherein the pair of parallax image information is recorded on the information recording body in correspondence with the irradiation angle of the light, respectively. The information recording method according to claim 10, wherein a plurality of pairs of parallax image information are recorded on the same information recording body.

  The invention according to claim 12 is the information recording method according to any one of claims 9 to 11, wherein the light is laser light.

  According to the first aspect of the present invention, the basic structure of the information recording body is a multilayer structure of a lens assembly layer composed of unit cells having a lens function and a coloring layer. When light such as a laser is irradiated from the lens assembly layer side, the light that has passed through the lenses of the individual unit cells is condensed, and only the portion where the light is condensed can be colored in the coloring layer. Thereby, for example, when laser light of an irradiation pattern corresponding to one image is irradiated from a specific angle, condensing occurs in each unit cell lens irradiated with the laser light of the irradiation pattern, The coloring layer develops color at the focal portion, and an irradiation pattern corresponding to the one image is recorded as a coloring pattern. Therefore, it is possible to provide an information recording body that enables an observer to observe the color development pattern only from the irradiation angle when the laser beam is irradiated.

  According to the second aspect of the present invention, when the information recording medium is provided with the focal length adjustment layer, the focal length of the light such as laser light is adjusted to focus on the coloring layer. Therefore, it is possible to provide an information recording body that can further expand the allowable range of the material and lens design of the lens function portion of the unit cell.

  According to the third aspect of the present invention, in the information recording body, at least one of the lens assembly layer and the focal length adjustment layer is partially arranged in an arbitrary pattern, so that the arbitrary pattern An information recording body capable of recording information limited to the above range can be provided.

According to the fourth aspect of the present invention, in the information recording medium, at least a lens assembly layer is disposed, then a focal length adjusting layer is disposed, and then a color developing layer is disposed, and the focal length adjusting layer and the color developing layer are disposed. A relief type diffractive structure having the function of a relief type diffractive element is formed on at least a part of the layer, and further reflected on at least a part of the surface including the part where the relief type diffractive structure part of the coloring layer is formed. By arranging the layer, for example, the relief type diffractive structure part can be provided with a function of a relief type diffractive lens utilizing a diffraction phenomenon, and by combining with the function of the reflective layer, the observer can record the information recording medium. An information recording body that can observe an image only at a specific distance can be provided.

  According to the present invention of claim 5, in the information recording medium, at least a lens assembly layer is disposed, at least a color developing layer is disposed, and then a relief type diffractive structure layer having a function of a relief type diffraction element is disposed. By providing a reflective layer on at least a part of the surface on which the relief type diffractive structure layer is arranged, for example, the relief type diffractive structure part has a function of a relief type diffractive lens utilizing a diffraction phenomenon. By combining with the function of the reflective layer, it is possible to provide an information recording body that allows an observer to observe an image only at a specific distance from the information recording body.

  According to the sixth aspect of the present invention, in the information recording body, a volume hologram layer is disposed as one of the layers disposed below the surface opposite to the light irradiation side of the lens assembly layer. This makes it possible for the observer to observe information obtained by combining the hologram information recorded in the volume hologram layer and the information on the coloring layer separately, so that the hologram information can enhance the security function. A reliable information recording medium can be provided.

  According to the seventh aspect of the present invention, in the color forming layer of the information recording body, the light transmittance of the color forming layer before irradiation with the light is 50% or more, and the wavelength of the light is from 360 nm to 830 nm. When the observer observes the information recording medium in the visible light region, the background information set on the other side of the coloring layer can be observed through the coloring layer. In addition, an information recording body that can be observed by combining the background information and the information of the color developing layer can be provided.

  According to the ninth aspect of the present invention, in the information recording method on the information recording body, the irradiation angle of light with respect to the virtual plane formed by the apexes of the unit cells of the lens assembly layer is irradiated from two or more angles. By doing so, it is possible to provide an information recording method capable of recording image information that can be confirmed only at the respective light irradiation angles of the plurality of angles onto the same information recording body.

  According to the invention of claim 10, in the information recording method on the information recording body, the irradiation angle of the light with respect to the virtual plane formed by the vertices of the unit cells of the lens assembly layer is determined by the observer's eyes at the observation point. Is formed from two angles, light is emitted from each angle, and information of an image corresponding to each angle is recorded as a pair of parallax image information, so that an observer can view the pair of parallaxes with both eyes. It is possible to provide an information recording method that enables parallax to be obtained when viewing image information so that it can be recognized as a stereoscopic image.

  According to the invention of claim 11, in the information recording method on the information recording body, the pair of parallax image information is recorded on the information recording body corresponding to the irradiation angle of the light, respectively. An information recording method capable of recording a plurality of pairs of parallax image information on the same information recording body can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto. Moreover, although the case where a laser beam is used as light is demonstrated, this invention is not limited to this.

FIG. 1 is an explanatory view showing, in section, a first embodiment of an information recording body according to the present invention. The information recording body 11 includes a lens assembly layer 2 in which unit cells having a function of a plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, and a coloring layer 3 that develops color when irradiated with laser light. The coloring layer 3 is arranged on the side where the light incident on the lens assembly layer 2 is collected.
FIG. 2 is an explanatory view showing, in section, the second embodiment of the information recording body according to the present invention. The information recording body 12 is provided between a lens assembly layer 2 in which unit cells having a function of plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, and a coloring layer 3 that develops color when irradiated with laser light. The focal length adjustment layer 4 is provided. The focal length adjustment layer 4 serves as a spacer for adjusting the distance so that the lens focal point position of the lens assembly layer 2 is in the vicinity of the coloring layer 3.

FIG. 3 is an explanatory view showing, in section, a third embodiment of the information recording body according to the present invention. Here, an example is shown in which a lens assembly layer 2 is used in which unit cells having the function of a plano-convex lens are arranged adjacent to each other in a plane so as not to have a gap and are formed in an arbitrary pattern.
The information recording body 13 is provided between a lens assembly layer 2 in which unit cells having a function of plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, and a coloring layer 3 that develops color when irradiated with laser light. The focal length adjustment layer 4 is provided. The focal length adjustment layer 4 serves as a spacer for adjusting the distance so that the lens focal point position of the lens assembly layer 2 is in the vicinity of the color development layer 3.

  FIG. 4 is an explanatory view showing, in section, a fourth embodiment of the information recording body according to the present invention. The information recording body 14 includes a lens assembly layer 2 in which unit cells having a function of a plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, and a coloring layer that develops color when irradiated with laser light, and has a diffractive structure. The diffractive structure coloring layer 31, the focal length adjusting layer 4, and the reflective layer 5 provided in the vicinity of the diffractive structure.

  FIG. 5 is an explanatory view showing, in section, the fifth embodiment of the information recording body according to the present invention. The information recording body 15 includes a lens assembly layer 2 in which unit cells having a function of a plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, a coloring layer 3 that develops color by laser light irradiation, a relief type In this configuration, the diffractive structure layer 6 and the reflective layer 5 are provided.

  FIG. 6 is an explanatory view showing, in section, the sixth embodiment of the information recording body according to the present invention. The information recording body 16 includes a lens assembly layer 2 in which unit cells having a function of a plano-convex lens are arranged adjacent to each other in a planar manner so as not to have a gap, a coloring layer 3 that develops color by laser light irradiation, and a volume hologram. And a layer 7.

  FIG. 7 is an explanatory view showing in cross section an example of a recording method for an information recording medium according to the present invention. Here, the information recording body 12 described in FIG. 2 will be described as an example.

  The laser beam 81 irradiated perpendicularly to the lens assembly 2 is condensed by each unit cell constituting the lens assembly 2, and the focal portion of the lens of the unit cell in the color developing layer 3 is colored and colored. A portion 301 is generated. Thereby, the information of the first image that can be confirmed from the vertical direction can be recorded.

  FIG. 8 is an explanatory view showing, in cross section, the next example of the recording method on the information recording body according to the present invention, following the example of FIG. Here, the information recording body 12 described in FIG. 2 will be described as an example.

  The laser light 82 irradiated from the direction of an arbitrary angle 802 with respect to the normal of the lens assembly 2 is condensed by the lens of each unit cell constituting the lens assembly 2, and the unit cell in the coloring layer 3 is condensed. The focal portion is colored to produce a colored portion 302. Thereby, the information of the second image that can be confirmed only from the direction of an arbitrary angle 802 with respect to the perpendicular can be recorded. As shown here, it can be distinguished from the colored portion 301 shown in the explanatory diagram of FIG.

FIG. 9 is an explanatory view showing in cross section an example of observing information recorded on the information recording medium according to the present invention.

  Here, when the information recording body 12 on which two pieces of image information are recorded by the method described in FIGS. 7 and 8 is observed from a direction 901 perpendicular to the lens assembly 2, the information recording body 12 is at the focal portion of the lens of the unit cell. Only the colored portion 301 of the coloring layer 3 is magnified by the lens of the unit cell, and can be observed as the first image from the combined information of the colored portion 301.

  FIG. 10 is an explanatory view showing in cross section another example of observing information recorded on the information recording medium according to the present invention.

  Here, as shown in FIG. 10, when observed from an observation point 902 in the direction of an arbitrary angle 802 with respect to the normal of the lens plane, only the colored portion 302 of the coloring layer 3 at the focal point of the lens of the unit cell is the unit cell. And can be observed as a second image from the combined information of the portion 302.

  At this time, by irradiating the laser beam 81 and the laser beam 82 with irradiation patterns corresponding to different images in the examples of FIGS. 7 and 8, it is possible to make two images different depending on the angle appear. .

  FIG. 11 is an explanatory diagram showing, in section, an example of a method for recording parallax information onto an information recording body according to the present invention. Here, the information recording body 12 described in FIG. 2 will be described as an example.

  Right-view information recording portion 303 that is colored and recorded by laser light 83 that irradiates the pattern of right-view image information in image information that is a pair of right-view image information and left-view image information that can give parallax to the observer. Then, by creating the left vision information recording portion 304 that is colored and recorded by the laser beam 84 that irradiates the pattern of the left vision image information, it is possible to record the image information consisting of these pairs. By recording this as a pair of parallax image information, parallax can be obtained and recognized as a stereoscopic image when an observer views the pair of parallax image information with both eyes.

  Note that the laser beams 83 and 84 in this case may be diffused laser beams depending on the reproduction state of image information, and such a recorded reproduction image having a three-dimensional effect without distortion and missing portions. It is also possible to obtain

FIG. 12 is an explanatory diagram showing, in section, an example of observing a pair of parallax image information recorded on the information recording medium according to the present invention.
The right eye 903 visually recognizes the right vision information recording portion 303 magnified by the lens, and the left eye 904 visually recognizes the left vision information recording portion 304 magnified by the lens. For this reason, the observer can make the left and right image information visible only to each eye, and can obtain parallax. Thereby, the observer can recognize as a stereoscopic image.

  Below, each member which comprises the forgery prevention structure of this invention and a forgery prevention sheet | seat body is demonstrated in detail. However, the present invention is not limited to these.

[Coloring layer]
The coloring layer is not particularly limited as long as it can be marked with a laser beam, and there are no particular restrictions on inorganic, metal, organic dyes, polymer materials, etc., and materials used for laser engraving and write-once type All known material systems such as those used for optical recording media can be used.
Moreover, it is possible to use a film forming body of these materials, or to use a coating obtained by wet coating by dissolving or dispersing in a solvent, or by dry coating such as vacuum deposition or sputtering. Is possible.
As a characteristic of the material, it is desirable to have a threshold characteristic such that color development is started by light having a specific intensity or more.

  For example, polycarbonate resin or polyester resin, which is generally used as a laser engraving material for ID cards, is carbonized at a high temperature above a specific temperature by absorbing laser pulse energy. There are many cases where information is recorded, and it is necessary to use a film-shaped product of such a material, or a coating layer obtained by applying a resin coating solution in which these materials are dissolved in a solvent. It is also possible to use as.

  Moreover, the kind of coloring composition used in the “black coloring layer” and “color coloring layer” in Patent Document 1 can also be used, and in particular, a method of adding a light absorbing material to a resin or bonding it to a resin skeleton, The method using heat-sensitive microcapsules is an effective method for coloring with low energy.

  Another example is the color-developing composition of “laser-markable compound” and “photopolymer” in Patent Document 5, and the modification is promoted by laser light irradiation, especially for threshold control. The method of adding the compound to be added or bonding the compound to the resin skeleton is an effective technique for developing color with low energy.

  It also absorbs plastic materials that are modified by irradiation of the laser focused by the lens assembly layer, plastic materials that contain inorganic materials and / or organic materials that are promoted for modification, or irradiated lasers. As a plastic material containing an inorganic material and / or an organic material that generate heat, use of the material described in Patent Document 5 is given as an example.

  When the light transmittance in the visible light region of the color developing layer before laser irradiation is 50% or more, the observer can print images or images on the back side of the color developing layer with respect to the observer. In addition, it is possible to confirm the color information of the image by the relief type diffractive structure or the image by the volume hologram.

(Lens assembly layer)
The lens assembly layer has a structure in which unit cells having a lens function having a condensing element are arranged adjacent to each other in a planar manner so that there are no gaps. A microlens array and the like can be mentioned, but not limited to this.

  For example, a convex lens, a plano-convex lens, a biconvex lens, a meniscus convex lens, a convex cylindrical lens, a lenticular lens, a Fresnel lens, a diffractive lens, a spherical lens, or one or more unit cells composed of a combination of the above lenses are planarized. It is also possible to use a lens assembly arranged so as not to have a gap next to each other, or a continuous film having the same surface shape as the lens assembly and having a light collecting function.

  Furthermore, even if the surface shape is flat, the lens assembly layer exhibits the function of a lens that functions as a unit cell by continuously and periodically changing the refractive index of the material, and consists of these. A combination of a plurality of lenses may be used.

  As the material of the lens assembly layer, it is suitable for use in consideration of light collecting characteristics, transparency, heat resistance, chemical resistance, abrasion resistance, etc. from organic materials, inorganic materials, organic inorganic composite materials, etc. What is necessary is just to select a material suitably.

  Further, it is preferable that the unit cell portions constituting the lens assembly have the same shape and are periodically densely integrated in a planar shape. Recording is possible even in the case of a shape in which unit cells having different shapes are assembled, but there is a possibility that partial recording omission occurs due to a difference in focal length of individual unit cells. In addition, when the unit cell has no periodicity or is not densely packed, the recorded image information is not reproduced in a portion without the unit cell, so that a reproduced image is partially lost.

  In particular, since a characteristic for transmitting and condensing laser light is required, heat resistance corresponding to the irradiation amount and irradiation frequency of the laser light to be used is required. When a lens assembly having no heat resistance is used, individual unit cells are deformed or deteriorated after irradiation during information recording, and the recorded image information cannot be reproduced accurately.

  In the lens assembly layer, unit cells can be integrated in a plane in an arbitrary pattern area, or a plurality of lens assembly layers having different condensing functions can be provided in each pattern area. This makes it possible to obtain an information recording body in which only a specific portion can be written with a laser beam.

The method for forming the lens assembly layer can be formed by a known method. For example, a dry etching method or a wet etching method is applied, or as disclosed in Patent Document 8, it corresponds to a lens. A method of manufacturing a microlens array by dropping a resin on a master plate on which a spherical surface is formed, solidifying and peeling the resin, or a microlens array using surface tension as disclosed in Patent Document 9 A manufacturing method and a manufacturing method of a microlens array in which a plurality of lens surfaces are formed on both sides as disclosed in Patent Document 10 are known and can be formed by these manufacturing methods. It is not limited and can be manufactured by a known method.
The lens assembly layer may be directly formed on the color forming layer or the focal length layer by these known manufacturing methods.

(Focal distance adjustment layer)
The focal length adjustment layer is disposed between the lens assembly layer and the color developing layer, and adjusts the interlayer distance so that the individual lens focal points constituting the laser assembly layer are located on the surface or inside of the color developing layer. There is a function.

  The focal position at various laser incident angles with respect to the lens assembly layer has a thickness and shape that becomes the surface of the color forming layer or inside, thereby suppressing distortion and blurring of the reproduced image due to the observation angle. Is possible.

The material used may be any of an organic material, an inorganic material, and an organic-inorganic composite material, and is not limited.
Moreover, as a method of forming the focal length adjustment layer, it can be provided by a known method such as a vacuum deposition method, a sputtering method, a CVD method, a wet coating, a hot embossing method, or the like.
In addition, since it is necessary to transmit the laser beam condensed by the lens assembly layer, it corresponds to the laser beam used, the irradiation amount of the pulse laser beam, the irradiation frequency, and the condensing action of the lens assembly layer. Heat resistance is required. In particular, since the light is condensed at the interface with the coloring layer, the heat resistance at the interface is important. In this case, it is considered necessary to have heat resistance corresponding to the amount of laser irradiation necessary for the coloring layer to develop color. When a lens assembly having no heat resistance is used, the lens is deformed or deteriorated after irradiation at the time of information recording, and the recorded image information cannot be reproduced accurately.

(Diffraction structure coloring layer)
The diffractive structure color forming layer is characterized in that the color forming layer itself forms a relief type diffractive structure, and the diffractive structure has a vivid color conversion function depending on an observation angle by a close reflection layer.

  An information recording medium provided with such a coloring layer can provide a vivid color conversion function by a relief type diffractive structure in a non-recording portion (non-coloring portion) of image information, and an individual recording portion (coloring portion). It becomes an information recording body with high security that can confirm information as a three-dimensional image or a plurality of images.

  The diffractive structure coloring layer may be molded by a publicly known method such as a heat embossing method, a photopolymer method, or the above composite method. For example, after obtaining a coating film of the coloring layer by a wet coating method. It can be formed by a hot embossing method in which a die having a diffractive structure is pressed against a heated coating film to transfer the shape.

[Relief type diffractive structure layer]
The relief type diffractive structure layer can be formed by a known technique described in Patent Document 2, for example.

  Examples of materials used include thermoplastic resins such as polyvinyl chloride, acrylic resin (eg, PMMA), polystyrene, polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy Thermosetting resins such as (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and triazine acrylate are used alone, or the above thermoplastic resin and thermosetting resin are mixed. Furthermore, a thermoformable substance having a radically polymerizable unsaturated group, or a substance that has been made ionizing radiation curable by adding a radically polymerizable unsaturated monomer to the material is used. Can do. In addition, photosensitive materials such as silver salt, dichromated gelatin, thermoplastic, diazo photosensitive material, photoresist, ferroelectric, photochromic material, thermochromic material, chalcogen glass, and the like can also be used.

  A method of forming a relief type diffractive structure using the above-mentioned material can be formed by a known method. For example, when recording a diffraction grating or interference fringes of a hologram as a relief of surface irregularities, a diffraction grating or For the optical diffraction structure forming layer on the protective layer of the laminated sheet in which the original plate on which the interference fringes are recorded in the form of irregularities is used as a press die, and the release resin layer and the protective layer are sequentially laminated on the support. A resin coating solution is applied by means such as gravure coating, roll coating, bar coating, etc., and a coating film is formed. By doing so, the concavo-convex pattern of the original plate can be duplicated. Moreover, when using a photopolymer, after coating a photopolymer similarly on the protective layer of the said lamination sheet, it can duplicate by irradiating a laser beam, overlapping the said original plate.

  As described above, a method of recording diffraction gratings or hologram interference fringes on the surface of the optical diffraction structure layer as a relief of the surface irregularities is particularly preferable because it is mass-productive and can reduce the cost.

(Reflective layer)
The reflective layer of the present invention is composed of an optical thin film provided so as to cover the diffractive structure, and reflects diffracted light generated by the diffractive structure. For this reason, an optical effect can also be obtained by using a high refractive index material having a higher refractive index than that of the diffractive structure. In this case, the difference in refractive index between the two layers is preferably 0.2 or more. By setting the difference in refractive index to 0.2 or more, refraction and reflection occur at the interface between the diffractive structure and the reflective layer, and an optical effect due to the structure of the diffractive structure can be obtained.

  Examples of the material of the reflective layer include a single metal material such as Al, Sn, Cr, Ni, Cu, Au, and Ag, or a compound thereof.

Examples of high refractive index materials that can be used as a transparent reflective layer are given below. The numerical value in parentheses following the chemical formula or compound name shown below indicates the refractive index n. As ceramics, Sb ₂ O ₃ (3.0), Fe ₂ O ₃ (2.7), TiO ₂ (2.6), CdS (2.6), CeO ₂ (2.3), ZnS (2 .3), PbCl ₂ (2.3), CdO (2.2), Sb ₂ O ₃ (5), WO ₃ (5), SiO (5), Si ₂ O ₃ (2.5), In ₂ O ₃ (2.0), PbO (2.6), Ta ₂ O ₃ (2.4), ZnO (2.1), ZrO ₂ (5), MgO (1), Si ₂ O ₂ (10) MgF ₂ (4), CeF ₃ (1), CaF ₂ (1.3 to 1.4), AlF ₃ (1), Al ₂ O ₃ (1), GaO (2), and the like. Examples of the organic polymer include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethyl methacrylate (1.49), polystyrene (1.60) and the like. These materials are appropriately selected based on optical characteristics such as refractive index, reflectance, and transmittance, weather resistance, interlayer adhesion, and the like, and are formed in the form of a thin film. As a forming method, a known method such as a vacuum deposition method, a sputtering method, a CVD method, or the like that can control the film thickness, the film forming speed, the number of stacked layers, the optical film thickness, and the like can be appropriately used. It is also possible to apply high-brightness inks in which the fine particles are dispersed in various solvents.

  In addition, high-brightness light reflecting ink obtained by dispersing the above-mentioned fine powder, sol or metal nanoparticle of metal, ceramics, or organic polymer in an organic polymer resin, or organic polymer or organic polymer fine particles should be used. You can also. In this case, care must be taken so that the diffractive structure does not change due to alteration by the solvent, but it can be formed by a known printing method such as gravure printing, flexographic printing, or screen printing. When the reflective layer is provided by such a printing method, the thickness of the reflective layer after drying may be adjusted to be about 0.001 to 10 μm.

  Further, the reflective layer or the transparent reflective layer may be partially provided. In this case, pasta processing, water-washed celite processing, laser processing, etc. can be mentioned as examples, and it is also possible to provide a fine sea-island-like reflective layer by, for example, vacuum deposition of tin or the like.

  The transmittance of the transparent reflective layer is 20% or more in the wavelength region of 360 to 830 nm, and within this range, information disposed under the reflective layer, for example, facial photographs, characters, patterns, etc. This is because the print information can be confirmed.

  In the portion where the transparent reflective layer is disposed, visible information can be provided below the reflective layer, and necessary information and a forgery prevention structure can be stacked. With these technologies, for example, it can be applied to an anti-counterfeit oversheet that can be used in an ID card, a passport, or the like.

[Volume hologram layer]
The volume hologram layer may be formed by a known method described in Patent Document 5. For example, after a photosensitive resin composition for volume hologram is dried and applied to a film thickness of 10 μm to obtain a volume hologram forming layer, the volume hologram forming layer is adhered to the mirror original plate, Laser light (wavelength 514.5 nm) is incident at 35 ° from the normal direction of the dried coating film, and after recording a volume hologram (hologram mirror) by making incident light and reflected light interfere with each other, heating and ultraviolet fixing exposure are performed. A fixed volume hologram can also be obtained.

  Furthermore, a barrier layer can be provided between the volume hologram layer and the adjacent layers. Depending on the combination of the volume hologram resin composition used in the present invention, the release layer, and the heat-sensitive adhesive layer, the low molecular weight component may be transferred from the volume hologram layer to other layers over time. Then, the peak wavelength of the recorded hologram may shift to the blue side (short wavelength side), and when this shifts to the release layer or the like, the peelability may be changed. By providing the barrier layer as described above, these obstruction factors can be eliminated.

  The material used for such a barrier layer is not particularly limited as long as it is a material that exhibits its barrier properties, but the object can usually be achieved by using a transparent organic resin material. Among them, a solvent-free trifunctional or higher functional group, preferably a hexafunctional or higher functional ionizing radiation curable epoxy-modified acrylate resin, urethane-modified acrylate resin, acrylic-modified polyester resin, etc. that reacts with ionizing radiation such as ultraviolet rays and electron beams is used. Can do. In particular, urethane-modified acrylate resins are preferably used because of their high barrier properties.

  Further, as these ionizing radiation curable resins, those having a molecular weight in the range of 500 to 2,000 are preferably used in consideration of coating suitability, hardness of the finally obtained barrier layer, and the like. Further, since the coating of the barrier layer is basically a solventless system, it can be laminated on any of the volume hologram layer, the release layer, and the heat-sensitive adhesive layer.

[Laser used]
The types of lasers to be marked include far infrared lasers typified by CO2 lasers, Nd: YAG lasers, near infrared pulse lasers typified by Nd: YVO lasers, visible light pulse lasers, excimer lasers, Nd: YAG lasers or Examples include an ultraviolet laser using a third harmonic of an Nd: YVO laser, a semiconductor laser, a femtosecond laser, and a picosecond laser. In particular, the Nd: YAG laser and the Nd: YVO laser have advantages such as high output and high pulse stability. A laser using the third harmonic of an Nd: YAG laser or an Nd: YVO laser has advantages such as high resolution and UV light absorption of the marking material. In addition, an ultrashort pulse laser such as a femtosecond laser or a picosecond laser can break a molecular bond without bringing the material into a high temperature state, and thus writing without heat is possible. A YAG or diode laser can be a relatively small device that emits a large amount of heat energy, and information can be recorded on demand.
Furthermore, it is also possible to collect or diffuse a laser to be irradiated in order to obtain a beautiful reproduced image, a stereoscopic image, or adjust the focal length. In such a case, a known condensing element or light diffusing element may be used.

[Information Recorder]
The information recording body in the present invention is the information recording body according to any one of claims 1 to 8, wherein the information recording body is in a state both before recording information and after recording at least part of information.
For this reason, for example, in the case of an information recording body in which the volume hologram and the information recording layer are multi-layered like the information recording body according to claim 6, even if the individual information is not printed by the laser It corresponds to the present invention. By manufacturing such an information recording body and adding information such as individual information when it is actually used, security is dramatically improved, and information can be added on demand.

[Information recording method]
The information recording method of the present invention is characterized in that the laser irradiated from the lens assembly layer side is condensed by each lens of the lens assembly layer, and the coloring layer is colored and recorded by the condensed laser. . Note that information such as a plurality of pieces of image information can be recorded by changing the direction of the laser to be irradiated.

  In the information recording method of the present invention, the laser output, the spot diameter, the frequency, the scanning speed, the lens condensing action, the lens so that the colored layer is not colored by the unfocused laser and the colored laser is colored. It is preferable to adjust the focal length. With such an information recording method, it is possible to prevent, for example, contrast in image information from being lowered by a laser that has not passed through the lens. Further, even an information recording body having a lens assembly layer provided in a pattern on the color-developing layer can be recorded only at the lens portion.

  As an example of a stereoscopic image recording method that applies recording of a plurality of pieces of image information, there is a stereogram obtained by making it possible to reproduce a two-dimensional image at a certain angle of a three-dimensional object only from the angle. As such a stereogram original, a plurality of two-dimensional image information taken from an arbitrary angle of a three-dimensional object may be used. Recording of the obtained two-dimensional image information is completed by irradiating laser from the taken angle. The reproduced image of the information recording body recorded in this way is a reproduced image having a stereoscopic effect even when viewed from various angles.

As another example, right and left parallax image information is recorded on the same plane, and the left and right eyes are recorded so that only the left and right vision image information is reproduced, thereby reproducing a stereoscopic image by binocular parallax. Stereogram to be used. The original image of such a stereogram may use two-dimensional image information obtained by photographing the right eye image information and the left eye image information. Recording of the obtained two-dimensional image information is completed by irradiating the laser from the taken angle (the positions of the left and right eyes). The reproduced image of the information recording body recorded in this way becomes a reproduced image with a three-dimensional feeling that feels the depth.
The stereoscopic image is an example of a reproduced image to be obtained. The information recording body of the present invention is an information recording method characterized in that a plurality of image information can be recorded, and a reproduced image obtained is a plurality of two-dimensional image information, two-dimensional animation (moving image), and three-dimensional image information. Well, not limited to these.

  As described above, each member has been described in detail based on the examples, but each layer is colored in order to improve the design, printing is performed between the front and back surfaces or between layers, and any layer installed in a pattern It can be used as appropriate depending on the purpose of use, such as applying an overcoat that makes the level difference inconspicuous. In view of the adhesiveness of each layer, it is also possible to provide an adhesive layer and an adhesive anchor layer between the respective layers, and to perform various easy adhesion treatments such as corona discharge treatment, plasma treatment, and frame treatment.

  Further, for the purpose of removing light other than the diffracted light of the diffractive structure, a black layer (light absorption layer) or a colored layer (specific wavelength absorption layer) is entirely provided under the anti-counterfeit structure (1), or It is possible to provide an arbitrary pattern, or to additionally provide a reflection layer or a scattering layer for reflecting and scattering light other than the diffracted light of the diffractive structure in the regular reflection direction.

In addition, a protective layer may be coated on the outermost layer or an antireflection structure may be provided as long as the lens function of each unit cell is not hindered.Hereinafter, the present invention will be described in more detail with specific examples. To do.

<Example 1>
By forming a mold in which φ5.0mm hemispheres are arranged in a hexagonal close-packing method, and then injecting and cooling acrylic resin melted by injection molding, it is aligned in a hexagonal close-packing pattern consisting of φ5.0mm hemisphere unit cells. A lens assembly layer was prepared. 4 g / m ² (solid weight) of dry laminate adhesive with the following composition was applied to the lens assembly layer obtained, and a laser engraving polyester film (MERINEX-LEO 100 μm made by TEIJIN-DUPON) as a color developing layer. An information recording body was obtained by dry lamination.
[Adhesive formulation]
Takelac A511 (polyol made by Mitsui Takeda Chemical) 10 parts Takelac A-50 (polyisocyanate made by Mitsui Takeda Chemical) 1 part Ethyl acetate / toluene (weight ratio 1/1) 9 parts.

<Example 2>
A mold in which φ0.5mm hemispheres are arranged in a hexagonal close-packing method is formed, and by photopolymer method,
On the polyester film for laser engraving (MERINEX-LEO 100μm made by TEIJIN-DUPON), a lens assembly layer is created that is aligned in a hexagonal close-packed pattern consisting of unit cells of φ0.5mm hemisphere directly to obtain an information recording medium. It was.

<Example 3>
An information recording body was obtained in the same manner as in Example 2 except that a die in which φ0.1 mm hemispheres were arranged in a hexagonal close-packing method was used as the unit cell.

<Example 4>
On the polyester film for laser engraving (MERINEX-LEO 100μm made by TEIJIN-DUPON), as a unit cell, φ0.5mm glass beads are arranged in a flat plane using a hexagonal close-packing method, and then a polyester transparent resin is applied. An information recording body was obtained by fixing glass beads.

<Example 5>
Radius of curvature 50 microns, the lens in the plane side of the lenticular lens sheet of 130μm from the vertex position to the substrate back surface, the laser-coloring ink (Toyo Ink ^{Elbima-Z117) 10g / m 2} ( solid weight) was applied, the information recording medium Got.

  Image information was recorded on each information recording body obtained in Examples 1 to 5 using a laser marker (YAG pulse laser manufactured by Keyence). In recording the image information, a discolored portion 301 of the colored layer was generated by laser irradiation from the vertical direction as shown in FIG. Further, as shown in FIG. 8, a discolored portion 301 of the colored layer was generated by laser irradiation from an oblique direction 30 ° from the perpendicular.

The laser irradiation conditions were as follows.
Scanning speed: 500mm / s
Laser power: 5%
Line width: 0.2mm
Number of lines: 4 When the information recording bodies of Examples 1 to 5 recorded by the above method were observed from the vertical direction, the image information 91 shown in FIG. 9 could be confirmed. Further, when observed from an oblique direction of 30 ° from the perpendicular, the image information 92 shown in FIG. 10 was confirmed. As a result, the information recording body of the present invention was used to record information based on the information recording method of the present invention, and the results could be observed.

It is explanatory drawing which showed the 1st Embodiment of the information recording body based on this invention in the cross section. It is explanatory drawing which showed the 2nd Embodiment of the information recording body which concerns on this invention in the cross section. It is explanatory drawing which showed the 3rd Example of the information recording body which concerns on this invention in the cross section. It is explanatory drawing which showed the 4th Example of the information recording body which concerns on this invention in the cross section. It is explanatory drawing which showed the 5th Example of the information recording body which concerns on this invention in the cross section. It is explanatory drawing which showed the 6th Embodiment of the information recording body which concerns on this invention in the cross section. It is explanatory drawing which showed the example of the recording method to the information recording body concerning this invention in the cross section. It is explanatory drawing which showed the following example in the cross section of the recording method to the information recording body concerning this invention after the following example. It is explanatory drawing which showed the example which observes the information recorded on the information recording body concerning this invention in the cross section. It is explanatory drawing which showed in cross section the other example which observes the information recorded on the information recording body concerning this invention. It is explanatory drawing which showed the example of the recording method of the parallax information to the information recording body concerning this invention in the cross section. It is explanatory drawing which showed the example which observes a pair of parallax image information recorded on the information recording body concerning this invention in the cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... 1st information recording body 12 ... 2nd information recording body 13 ... 3rd information recording body 14 ... 4th information recording body 15 ... 5th information recording body 16 ... sixth information recording body 2 ... lens assembly layer 3 ... coloring layer 31 ... relief type diffractive structure coloring layer 301 ... each unit of colored layer corresponding to the first image information A portion colored at the focal point of the lens of the cell 302... A portion 303 colored at the focal point of the lens of each unit cell of the colored layer corresponding to the second image information. Information recording portion 4 ... focal length adjustment layer 5 ... reflection layer 6 ... relief type diffractive structure layer 7 ... volume hologram layer 81 ... perpendicularly irradiated laser beam 82 ... arbitrary Laser light 83 irradiated from the direction of angle 802. Irradiates the pattern of right-view image information. Laser beam 84... Laser beam 801 for irradiating a pattern of left vision image information 801... Direction 802 perpendicular to the lens assembly 802. Second image information 92 ... Second image information 901 ... Observation point 902 in the direction of the normal of the lens plane ... Observation point 903 in the direction of an arbitrary angle 802 with respect to the normal of the lens plane Right eye 904 ... Left eye

Claims (12)

  An information recording body having at least a color-developing layer that changes color or changes color when irradiated with light having a specific intensity or more, and a lens assembly layer, wherein the lens assembly layer has a light-collecting function. The unit cell having a lens function having a lens function is arranged adjacent to each other in a plane so that there is no gap, and the color-developing layer is arranged on the side on which light incident on the lens assembly layer is collected An information recording body characterized by comprising:   An information recording medium, comprising: a focal length adjustment layer for making a lens focal position of the lens assembly layer the position of the color development layer, the focal length adjustment layer comprising the color development layer and the color development layer The information recording body according to claim 1, wherein the information recording body is disposed between the lens assembly layer and the lens assembly layer.   3. The information recording body according to claim 1, wherein at least one of the lens assembly layer and the focal length adjustment layer is partially arranged in an arbitrary pattern. body.   An information recording body, wherein at least a lens assembly layer is disposed, then a focal length adjustment layer is disposed, and then a color developing layer is disposed, and at least part of the focal length adjusting layer and the color developing layer, A relief type diffractive structure having a function of a relief type diffractive element is formed, and a reflective layer is disposed on at least a part of the surface of the color forming layer including the part where the relief type diffractive structure is formed. The information recording body according to any one of claims 1 to 3.   An information recording body, wherein at least a lens assembly layer is disposed, at least a coloring layer is disposed, and then a relief type diffraction structure layer having a function of a relief type diffraction element is disposed, and the relief type diffraction structure layer The information recording body according to any one of claims 1 to 3, wherein a reflective layer is disposed on at least a part of the surface on which the light is disposed.   The volume hologram layer is arranged as any one of the information recording bodies and disposed under a surface opposite to the light irradiation side of the lens assembly layer. The information recording body according to any one of 1 to 5.   The light-transmitting layer has a light transmittance of 50% or more before being irradiated with the light, and the wavelength of the light is in the range of 360 nm to 830 nm. The information recording body according to any one of the above.   The information recording body according to claim 1, wherein the light according to claim 1 is a laser beam.   9. The method of recording information on an information recording body according to any one of claims 1 to 8, wherein the color-developing layer is colored by light condensed by the light-collecting effect of the lens assembly layer. By irradiating the light irradiation angle with respect to the virtual plane formed by the apexes of the unit cells of the lens assembly layer from two or more angles, it is confirmed only at the light irradiation angles of the plurality of angles. An information recording method, wherein information of possible images is recorded on the same information recording body.   9. The method of recording information on an information recording body according to any one of claims 1 to 8, wherein the color-developing layer is colored by light condensed by the light-collecting effect of the lens assembly layer. The light irradiation angle with respect to the virtual plane consisting of the apex of each unit cell of the lens assembly layer is composed of two angles assuming the eyes of the observer at the observation point, and the light is irradiated from each angle, By recording the image information corresponding to each angle as a pair of parallax image information, the parallax can be obtained when the viewer visually recognizes the pair of parallax image information with both eyes and can be recognized as a stereoscopic image. An information recording method characterized by:   An information recording method for an information recording body, wherein the pair of parallax image information is recorded on the information recording body in correspondence with the light irradiation angle, whereby the pair of parallax image information is the same information. The information recording method according to claim 10, wherein a plurality of records are recorded on a recording medium.   The information recording method according to claim 9, wherein the light is laser light.