JP5500548B2 - Latent image forming body - Google Patents

Description

  In the field of security printed matter such as banknotes, passports, securities, identification cards, cards, and passports that require anti-counterfeiting effects, the latent image is invisible under reflected light, and transmitted light Below, a latent image with a three-dimensional appearance appears, and in addition, a latent image formed with a special visual effect changes when the printed image is slightly tilted and observed under transmitted light. It is about the body.

  Because the three-dimensional visual effect that images such as letters and figures appear three-dimensionally and the animated visual effect that images move are easy to attract attention and difficult to counterfeit easily, In recent years, there is a tendency to be frequently used as an authenticity determination element for security printed matter. A typical example is a hologram affixed to a US visa card, which was issued in 1983 and has a three-dimensional image of a pigeon.

  In addition to holograms, using known techniques such as parallax barrier and lenticular, taking advantage of the feature that these images can change the image with a slight difference in viewing angle, the effect that the image can be viewed three-dimensionally, There is already a wide range of security prints with a moving visual effect that makes images appear to move.

  However, a stereoscopic image using a general parallax barrier or lenticular has a problem that a certain thickness (100 μm or more) is required for the printed matter in order to make the barrier effect and the lens effect function. In addition, if the phase of the latent image located below the barrier layer of the parallax barrier or the lens layer of the lenticular is slightly shifted from the appropriate position, a stereoscopic visual effect or animation visual Since the effect is unclear, there has been a problem that manufacturing requires strict management of printing.

  Among such problems, a printed matter in which images are observed from a plurality of different angles by observation with reflected light without requiring alignment between the lens and the latent image located below the lens is January 23, 2008- It was announced at "ODS (Optical Document Security)" held in San Francisco on the 25th. This printed material is formed by directly engraving a lenticular from a plurality of different angles to form an image, and the image formed by laser engraving forms a female face when observed from different angles. When this printed matter is observed under reflected light, a three-dimensional female face based on binocular parallax is observed.

  In recent years, a sheet in which a stereoscopic image appears using a special material called a retroreflective material has been disclosed (for example, see Patent Document 1). A retroreflective material is a sheet in which a large number of microlenses are embedded in a base substrate at a high density, and a light reflecting layer is formed of a material that reflects light (for example, aluminum) between the microlens and the substrate. It is. This retroreflective material has a characteristic that when light is incident from a specific direction, the light is strongly reflected mainly in the direction of the incident light, so it has been conventionally used for reflectors, road signs, etc. It has been. The technique for forming a stereoscopic image using a retroreflective material described in Patent Document 1 utilizes the photosensitive characteristics of the light reflection layer under the microlens, and irradiates strong light through the microlens. It is formed by printing an arbitrary image on the light reflecting layer under the microlens. By this method, the integral photography stereoscopic image can be recorded and reproduced, and a relatively thin (100 μm or less) stereoscopic image can be formed.

Special table 2003-524205 gazette

  In general, security printed materials are used under certain conditions that are required for authenticity discrimination, such as images observed under reflected light and, for example, watermarking, in order for everyone to reliably determine authenticity. It is considered that it is more desirable that the image observed in the above is different. However, the above-described technique is for observing a stereoscopic image under reflected light in order to determine the authenticity of a printed material. Regardless of whether authenticity determination is required or not, any image is always displayed. Has appeared. Therefore, since the above-described technique does not have the effects described above, there is a problem as a security printed matter that requires authenticity determination. In addition, when forming an image on a lenticular, there is a problem that an angle range in which a stereoscopic image is visually recognized is narrow compared with a retroreflective material.

  On the other hand, in the technique described in Patent Document 1, a three-dimensional image is formed by exposure with a strong light source using a reflection mask or drawing with strong light. The image is drawn with light diffused through a dispersion lens and converted into diffused light or scattered light. Although this method can form a stereoscopic image in a short time, it cannot form an image that requires complex gradation and high resolution like a human face, and the image that can be formed has low resolution. There is a problem that only simple images, that is, characters, symbols, marks, and the like can be expressed.

  In addition, an image obtained by using the technique described in Patent Document 1 is a perspective expression that can be formed by translating an image vertically and horizontally according to an observation position, or an image obtained by viewing an image from a different viewpoint. Although the 3D expression can be changed into the image, in the invention of Patent Document 1, the image printed on the microlens is printed by the diffused light or scattered light of the light transmitted through the mask. Therefore, there is a problem that it is impossible to provide a so-called changing effect, moving visual effect such as morphing or animation.

  The present invention aims to solve the above-mentioned problems, and can express a latent image formed using a retroreflective material even in an image that requires high resolution such as a human face or landscape. A latent image forming body is provided. In addition, by forming a plurality of images in one region of the retroreflective material according to a specific forming method, a latent image with a very natural stereoscopic effect is formed, and the change effect and / or animation of the latent image is performed. A latent image forming body having an effect is provided.

  In the latent image forming body of the present invention, a retroreflective material having a plurality of microlenses and a light blocking layer adjacent to the microlens is laminated on at least a part of a light-transmitting substrate, The light blocking layer corresponding to the microlens has one latent image element composed of a through-hole, and the latent image element is formed at a predetermined angle with respect to the center of the microlens. A latent image is formed by a set of a plurality of latent image elements that form the following. When viewed from a predetermined angle in observation with transmitted light, the latent image is formed by light transmitted through the plurality of latent image elements. It is characterized by being observed.

  Further, in the latent image forming body of the present invention, a retroreflective material provided with a plurality of microlenses and a light blocking layer adjacent to the microlens is laminated on at least a part of a light-transmitting substrate, The light blocking layer corresponding to one microlens has at least one latent image element composed of a through-hole, and the at least one latent image element has a first angle and a first angle different from each other with respect to the substrate. The first latent image element, the second latent image element,..., The nth latent image formed at the second angle,..., The nth angle (n is a natural number of 2 or more). A first latent image is formed by a set of first latent image elements, a second latent image is formed by a set of second latent image elements, and so on. , The n-th latent image is formed by the set of the n-th latent image elements, and is viewed by transmitted light. The first latent image is observed when the substrate is observed at a first angle, and the second latent image is observed when the substrate is observed at a second angle. ,...,..., When observed at an inclination of the nth angle, the nth latent image is observed.

  Further, the latent image forming body of the present invention has a first latent image element, a second latent image element,..., An nth latent image on a light blocking layer corresponding to one macro lens. Of the elements (n is a natural number of 2 or more), two or more different latent image elements are formed.

  In the latent image forming body of the present invention, the first angle, the second angle,..., The nth angle (n is a natural number of 2 or more) can be used to separate one arbitrary three-dimensional object from different angles. The first latent image, the second latent image,..., The nth latent image, the first angle, the second angle,... -It is composed of mutually different images observed from the nth angle (n is a natural number of 2 or more), and any three-dimensional object is stereoscopically observed as a latent image in observation with transmitted light And

  The latent image forming body of the present invention does not need to diffuse a laser beam using a concave lens or a dispersive lens and draws a latent image by directly irradiating a retroreflective material with a laser beam. An image having a complex gradation such as a landscape and requiring high resolution can also be expressed. In addition, because the drawing data can be easily changed for the same reason, it is not limited to the expression of a three-dimensional visual effect, but a moving image such as a so-called changing effect, morphing, or animation that changes an image to a different image. A visual effect can be easily imparted. In addition, the latent image forming body of the present invention has a so-called watermark effect that the latent image is completely invisible when observed under reflected light and can be observed only when observed with transmitted light. Have. In addition, the appearing latent image has a three-dimensional visual effect or moving image effect, and it is extremely difficult to imitate this, so that the forgery resistance is high and the authenticity discrimination is excellent.

It is a figure which shows the layer structure of the latent-image image forming body of this invention. It is a figure which shows the latent-image image forming body of this invention. In the latent image forming body of this invention, it is a figure which shows the positional relationship of a retroreflection material and a laser beam in the case of drawing a latent image with a laser beam, and its enlarged view. In the latent image forming body of this invention, it is a figure which shows the positional relationship of a retroreflection material and a laser beam in the case of drawing a latent image with a laser beam, and its enlarged view. In the latent image forming body of this invention, it is a figure which shows the positional relationship of a retroreflection material and a laser beam in the case of drawing a latent image with a laser beam, and its enlarged view. It is a figure which shows arrangement | positioning of a micro lens and a latent image image, and the latent image image element formed in a micro lens. It is a figure which shows an example of the apparatus which forms the latent-image image forming body of this invention. It is a figure which shows the observation principle of a latent image. 2 is a diagram illustrating a latent image forming body in Embodiment 1. FIG. FIG. 6 is a diagram illustrating a latent image image of Example 1. It is a figure which shows arrangement | positioning of the retroreflection material when forming a latent image element. It is a figure which shows the latent image image element formed in a micro lens. 6 is a diagram illustrating a latent image forming body in Embodiment 2. FIG. FIG. 6 is a diagram illustrating a latent image image of Example 2. FIG. 10 is a diagram illustrating a latent image forming body of Example 3. FIG. 6 is a view showing a latent image forming body of Example 4.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

(Base material composition)
As shown in FIG. 1 (a), the latent image forming body (1) of the present invention is formed by laminating a retroreflective material (3) on at least a part of a base material (2). The material (3) includes at least a microlens (5) and a light blocking layer (6). As shown in FIG. 1A, the retroreflective material (3) used in the present invention has a microlens (5) in which only a hemisphere is buried in the adhesive resin layer (4) and the rest is exposed on the surface. . And the light shielding layer (6) is provided corresponding to the surface of each microlens (5) buried in the adhesive resin layer (4). In general, what is present on the lower surface of the microlens (5) in the retroreflective material (3) is called a “light reflecting layer” composed of “material that reflects light”. Many of the light-reflecting materials used for the reflective material (3) have the property of blocking light in addition to the property of reflecting light. In this description, they are required in the present invention. In view of the nature, for convenience, it is referred to as a “light blocking layer (6)” made of “a material that blocks light”.

  FIG.1 (b) is a figure which shows the top view of the retroreflection material (3) laminated | stacked on the base material (2). In the present invention, the microlenses (5) may have the same size or different sizes. As shown in FIG. 1B, the density at which the microlenses (5) are arranged needs to be substantially uniform in order to form a latent image (8) to be described later, but a fixed pitch. There is no need to arrange them regularly. In addition, since an actual microlens has a diameter of about 20 to 100 μm and cannot be visually confirmed, FIG. 1B schematically illustrates a state in which the microlenses (5) are uniformly arranged. Is shown.

  Since the latent image forming body (1) of the present invention is for observing an image that appears by light transmitted through the base material (2), the base material (2) is made of a light-transmitting material. It is necessary to use it. Such materials include paper, plastic, and glass, and a base material (2) having an appropriate transmittance is selected according to the illumination conditions in an environment where authenticity determination of the latent image forming body (1) is required. It is necessary to select and use as appropriate. Temporarily, in order to observe the latent image (8) under a fluorescent lamp, a material having a transmittance of 10% or more is used, and in order to observe the latent image (8) under sunlight, transmission is required. It is preferable to use a material having a rate of 6% or more.

  About the light blocking layer (6), it is necessary to have a characteristic of completely blocking the transmission of light of a general illumination level such as sunlight or a fluorescent lamp, and when a strong light such as a laser is irradiated. For a limited time, it must have the property of disappearing. Specifically, the light blocking layer (6) is suitably aluminum, gold, silver, tin, nickel, stainless steel or the like used for a general retroreflective material. As the adhesive resin layer (4), various synthetic resins such as an acrylic resin, a urethane resin, a polyester resin, an epoxy resin, a nylon resin, a rubber resin, and a vinyl resin can be used.

  In the present invention, as shown in FIG. 1A, the light blocking layer (6) is formed with a through hole in which the light blocking layer (6) is partially removed at a predetermined angle, thereby forming a latent image. Is formed. Hereinafter, the through hole from which the light blocking layer (6) has been partially removed in a predetermined direction will be described as a “latent image element (7)”. The method for forming the latent image element (7) will be described later, and subsequently the latent image will be described.

  FIG. 2A is a plan view of the latent image forming body (1) of the present invention, and shows the latent image (8) formed on the retroreflective material (3). In FIG. 2A, the microlens (5) is not shown to show the configuration of the latent image (8). The latent image forming body (1) of the present invention may form one latent image (8) on the retroreflective material (3), or the first to nth latent image. A plurality of latent image images (8) may be formed up to (n is a natural number of 2 or more). In the present embodiment, the number “n” of the latent image images (8) is 3, and the first latent image, the second latent image, and the third latent image are formed. To do. The three latent image images (8) will be described using an example of a latent image forming body (1) composed of “a female face observed from different directions”. Thereafter, in order to distinguish the three latent image images (8), the code of the first latent image is “8A”, the code of the second latent image is “8B”, and the code of the third latent image is This will be described as “8C”. In FIG. 2 (a), only the first latent image (8A) is shown for convenience, but in this embodiment, the first latent image (8A) is shown in FIG. 2 (b). As shown in FIG. 2C, the second latent image (8B) is “a female face seen from the left side”, and the third latent image (8B) As shown in FIG. 2D, the latent image (8C) is composed of “a female face viewed from the right side”. These three latent image images (8) cannot be observed at a time. When the latent image forming body (1) is tilted at a predetermined angle and observed with transmitted light, each latent image image (8) is observed. (8) is visually recognized. The principle of observing the latent image (8) will be described later.

  In the present invention, as shown in the three latent image images (8) of the present embodiment, the latent image (8) is “one solid object (in this embodiment, a female face is a target of a three-dimensional object. Is not limited to an example in which “images observed from different angles” are formed. For example, each latent image (8) is an image expressing a mutually correlated motion, An image called “changing”, in which the moving image structure that expresses the movement of the image or each latent image (8) is composed of completely different designs and changes from one image to a completely different image. A configuration rich in change may be used. Further, in this embodiment, the latent image (8) is “female face”, but the latent image (8) formed on the latent image forming body (1) of the present invention is limited to this. However, an arbitrary image can be formed. For example, letters, numbers, symbols, landscape pictures, and the like may be used. The present embodiment is an example in which three latent image images (8) are formed. However, in the present invention, the number of latent image images is not limited to three, and a larger number of latent images. An image (8) can be formed, and the configuration thereof will be specifically described in Examples.

  Next, a method for forming the latent image (8) according to the present embodiment will be described. The horizontal direction of the latent image forming body (1) shown in FIG. 2A is “X axis”, the vertical direction is “Y axis”, and the vertical direction to the base material (2) is “Z axis”. This will be described below.

(Latent image formation method)
As described above, the latent image (8) is formed by the latent image element (7) from which the light blocking layer (6) has been partially removed, the latent image element (7) being a retroreflective material. In contrast to (3), it is formed by irradiating laser light from the microlens (5) side. First, a method for forming the first latent image (8A) among the three latent images (8) will be described.

  FIG. 3A is a diagram showing a state in which a first latent image (8A) is formed by irradiation with laser light (11) from a laser processing apparatus (not shown).

FIG. 3B is an enlarged view of a part of FIG. 3A, showing the laser light (11) irradiated to one microlens (5), and the laser light (11) is microscopic. The light blocking layer (6) is irradiated through the lens (5), and the light blocking layer (6) is partially removed to form a latent image element (7). At this time, in the microlens (5) irradiated with the laser beam (11), the laser beam (11) is irradiated from a predetermined angle (α) with respect to the vertical direction with respect to the substrate (2) as a reference. An image image element (7) is formed. Hereinafter, the angle (α) irradiated with the laser beam (11) when forming the first latent image (8A) is defined as “first angle (α _A )”, and the formed latent image element is defined as The first latent image element (7A) is assumed. In the present invention, the range of the predetermined angle (α) is a range of 0 degrees to less than 60 degrees with respect to the vertical direction. This is because the latent image element (7) is not formed on the light blocking layer (6) when the angle at which the laser beam (11) is irradiated exceeds 60 degrees. As shown in FIG. 3B, the target of the laser beam (11) irradiated when forming each latent image element (7) is a microlens (5) in a narrow sense. The object of the laser beam (11) irradiated when forming the entire latent image (8) will be described below as a retroreflective material (3) in a broad sense.

  FIG. 3B shows a state in which one microlens (5) is irradiated with laser light (11). In practice, however, the microlenses arranged uniformly on the substrate (2) are shown. Of the lens (5), a plurality of microlenses (5) at positions corresponding to the first latent image (8A) are irradiated with laser light (11) from the direction perpendicular to the base material (2). A first latent image element (7A) is formed, and a first latent image (8A) is formed by the set of first latent image elements (7A).

  Here, the “position corresponding to the latent image (8)” in the microlens (5) arranged uniformly on the substrate (2) will be described. For example, a printed matter formed with halftone dots forms a single image by densely gathering halftone dots. In the latent image forming body (1) of the present invention, the latent image element (7) formed on one microlens (5) is a part of the latent image (8). The latent image elements (7) formed on the plurality of microlenses (5) are gathered to form one latent image (8). Accordingly, the “position corresponding to the first latent image (8A)” means that a halftone dot is formed when the first latent image (8A) of the present invention is replaced with halftone printing. This is the position, and the same applies to the second latent image (8B) and the third latent image (8C) described later.

  Thus, as shown in FIG. 3, the first latent image (8A) is a first latent image formed by the laser beam (11) entering the retroreflective material (3) from the vertical direction. Formed by a set of image image elements (7A).

  Next, a method for forming the second latent image (8B) will be described. In the present invention, when a plurality of latent image images (8) are formed, the irradiation angle (predetermined angle (α)) of the laser beam (11) that forms each latent image (8) is the angle described above. It is necessary to change each in the range. This is because when different latent image images (8) are formed at the same irradiation angle, a plurality of images appear mixed together under transmitted light.

  FIG. 4A is a diagram showing a state in which a laser beam (11) is irradiated from a laser processing apparatus (not shown) and a second latent image (8B) is formed. In the present embodiment, when the second latent image (8B) is formed, as shown in FIG. 4A, the base material (2) has a predetermined direction in the clockwise direction around the Y axis. The laser beam (11) is irradiated in a state inclined by an angle (α) but not in the center of the X axis.

FIG. 4B is an enlarged view of a part of FIG. 4A, and shows laser light (11) irradiated to one microlens (5). By tilting the base material (2) in a clockwise direction around the Y axis by a predetermined angle (α), the laser beam (11) is counterclockwise with respect to the vertical direction with respect to the base material (2). The light is irradiated in a clockwise direction from a predetermined angle (α). Thus, since the angle (α) irradiated with the laser beam (11) is the same as the angle at which the substrate (2) is inclined, in this description, the angle at which the substrate (2) is inclined and the laser beam (11) ) Will be described using the same reference numerals. Further, the angle (α) irradiated with the laser beam (11) when forming the second latent image (8B) is set so that the laser beam (11) is formed when forming the first latent image (8A). Is different from the first angle (α _A ) at which the second latent image (8B) is formed, the angle (α) at which the laser beam (11) is irradiated when the second latent image (8B) is formed is hereinafter referred to as “second An angle (α _B ) ”will be described, and the formed latent image element is described as a second latent image element (7B).

  FIG. 4B shows a state in which one microlens (5) is irradiated with the laser light (11). In practice, however, the microlenses arranged uniformly on the substrate (2) are shown. In the lens (5), a plurality of microlenses (5) at positions corresponding to the second latent image (8B) are irradiated with laser light (11) from the direction shown in FIG. A second latent image (8B) is formed by the set of elements (7B). In FIG. 4B, the first latent image element is shown in order to show that the position of the second latent image element (7B) is different from the position of the first latent image element (7A). (7A) is indicated by a broken line.

  Next, a method for forming the third latent image (8C) will be described. FIG. 5A is a diagram showing a state in which a third latent image (8C) is formed by irradiation with laser light (11) from a laser processing apparatus (not shown). In the present embodiment, when the third latent image (8C) is formed, as shown in FIG. 5A, the base material (2) is predetermined in the counterclockwise direction around the Y axis. The laser beam (11) is irradiated in a state in which the angle (α) is inclined and in a state in which the angle is not inclined with respect to the X axis.

FIG. 5B is an enlarged view of a part of FIG. 5A, and shows laser light (11) irradiated to one microlens (5). When the substrate (2) is tilted at a predetermined angle (α) in the counterclockwise direction around the Y axis, the laser beam (11) is based on the direction perpendicular to the substrate (2), The light is irradiated in a clockwise direction from a predetermined angle (α). Further, the angle (α) at which the laser beam (11) is irradiated when the third latent image (8C) is formed is determined by the laser beam (11) when the first latent image (8A) is formed. Is different from the first angle (α _A ) irradiated with the laser beam (11) and the second angle (α _B ) irradiated with the laser beam (11) when forming the second latent image (8B). The angle (α) irradiated with the laser beam (11) when forming the third latent image (8C) is defined as “third angle (α _C )”, and the formed latent image element is defined as the third latent image element. The latent image element (7C) will be described.

  FIG. 5 (b) shows a state in which one microlens (5) is irradiated with laser light (11). Actually, however, the microlenses arranged uniformly on the substrate (2) are shown. In the lens (5), a plurality of microlenses (5) at positions corresponding to the third latent image (8C) are irradiated with laser light (11) from the direction shown in FIG. A third latent image (8C) is formed by the set of elements (7C). In FIG. 5B, the position of the third latent image element (7C) is different from the positions of the first latent image element (7A) and the second latent image element (7B). For the sake of illustration, the first latent image element (7A) and the second latent image element (7B) are indicated by broken lines.

  Thus, in the latent image forming body (1) of the present invention, the first latent image element (7A), the second latent image element (7B), and the third latent image element (7C) are: The first latent image image (8A) is formed by the set of the first latent image elements (7A) and is formed by the laser beams (11) irradiated from different directions, and the second latent image element ( 7B) forms a second latent image (8B), and a set of third latent image elements (7C) forms a third latent image (8C). As described above, in the present invention, the number of latent image images (8) is not limited to three, and a larger number of latent image images (8) can be formed. When the number “n” in 8) is 4, the first latent image element (7A), the second latent image element (7B), and the third latent image element (7C) are formed. Laser light (11) is irradiated at a fourth angle different from the angle to form a fourth latent image element, and a fourth latent image is formed by the collection of fourth latent image elements. Similarly, the nth latent image is irradiated with the laser beam (11) at an nth angle to form an nth latent image element, and is formed by a set of nth latent image elements.

  Next, the relationship between the latent image elements (7) formed by the above-described method on the uniformly arranged microlenses (5) and the three latent image images (8) will be described.

  FIG. 6A is a diagram showing the arrangement of the microlenses (5) and the three latent image images (8) that are uniformly arranged in the latent image forming body (1) of the present embodiment. FIG. 6B is an enlarged view of one microlens (5) in a portion surrounded by a thick line in FIG. 6A, and the diagram shown on the upper side is when the microlens (5) is viewed from above. It is a top view and the figure shown below is sectional drawing of the part in which a latent image image element (7) is formed. In FIG. 6A, a portion surrounded by a thick line is an area where a part of each of the three latent image images (8) overlaps. In such an area, as shown in FIG. A first latent image element (7A) constituting the first latent image (8A) and a second latent image (8B) constituting the first latent image (8B) are formed on the light blocking layer (6) adjacent to the lens (5). The second latent image element (7B) and the third latent image element (7C) constituting the third latent image (8A) are formed. Further, as described above, since the substrate (2) is tilted around the Y axis and the laser beam (11) is irradiated, the first latent image element (7A) and the second latent image element (7B) ) And a third latent image element (7C) formed on the X-axis.

  In FIG. 6, the microlens (5) in the area where the three latent image images (8) are formed has been described. In the present embodiment, one latent image image out of the three latent image images (8) is used. A latent image element (7) constituting one latent image (8) is formed on the light blocking layer (6) adjacent to the microlens (5) where only the (8) is formed (see FIG. In a portion where two latent image images (8) are formed, two latent image image elements (7) constituting them are formed (not shown). Naturally, the latent image element (7) is not formed on the light blocking layer (6) adjacent to the microlens (5) which is not at a position corresponding to the latent image (8).

  As described above, in the latent image forming body (1) of the present embodiment, three latent image images (8) are formed by irradiating the laser beam (11) with the substrate (2) tilted around the Y axis. Although the example to be formed has been described, the present invention is not limited to this, and it is also possible to form the latent image (8) by inclining the base material (2) around the X axis, and It is also possible to form the latent image (8) by inclining the substrate (2) about the X axis and the Y axis.

(Processing device for latent image elements)
FIG. 7 shows an example of the processing device (20) for forming the latent image element (7) in the method for forming the three latent image images (8) described above. The processing apparatus (20) shown in FIG. 7 includes a rotating stage (23) for placing a base material (2) provided with a retroreflective material (3), and a laser processing apparatus (22) for irradiating laser light (11). ), And a computer (21) that controls the rotation of the rotary stage (23) and the position irradiated with the laser beam (11) by the laser processing device (22). The angle can be changed by freely rotating the rotary stage (23) about the two axes of the X axis and the Y axis by rotating the main shafts (24x, 24y). Using such a processing apparatus (20), the laser beam (11) is irradiated to the retroreflective material (3) at a position corresponding to the first latent image (8A) from the first angle (α _A ). Then, the retroreflective material (3) at a position corresponding to the second latent image (8B) is irradiated with the laser light (11) from the second angle (α _B ), and the third angle (α _C ). To irradiating the retroreflective material (3) at the position corresponding to the third latent image (8C) with the laser beam (11) to produce the latent image forming body (1) of the present invention. it can. Note that the wavelength of light used in the laser processing device (22) is visible because it transmits the microlens (5) without damaging it and causes the light blocking layer (6) to have defects. It is desirable that the wavelength is near infrared. Specifically, lasers such as YAG, sapphire, and YVO ₄ are suitable. Here, the difference between “formation” and “drawing” with respect to the “latent image” described in the following description will be described. In the sense of processing the latent image (8) on the retroreflective material (3), both have the same meaning, but as a specific means for forming the latent image (8), laser processing is performed in the text. In the place where the device (22) or the similar means is described (including the place where the sentence is received and explained), it is explained using the word “drawing”, and no specific means are described. In the section, explanation is made using the phrase “formation”.

(Latent image observation principle)
Hereinafter, the principle that only one of the latent image images (8) of the three latent image images (8) of the latent image forming body (1) of the present invention is observed at a predetermined observation angle will be described.

FIG. 8 shows that the laser beam (11) was irradiated when forming the first latent image element (7A), the second latent image element (7B), and the third latent image element (7C). From the first angle (α _A ), the second angle (α _B ), and the third angle (α _C ), the observer is observing the latent image forming body (1) of the present invention. ing. In FIG. 8, the viewpoint (10A) shows a state where the latent image forming body (1) is observed from the first angle (α _A = 0 degree). The viewpoint (10A) is on an extension line (shown by a broken line) connecting the first latent image element (7A) and the center (O) of the microlens, and the retroreflective material (3). 2 shows the viewpoint of an observer located on the exposed side of the micro lens (5), and the light source (9A) connects the first latent image element (7A) and the center (O) of the micro lens. A light source located on the extended line of the line and located on the opposite side of the observer's viewpoint with the latent image forming body (1) interposed therebetween is shown. In FIG. 8, the viewpoint (10B) shows a state where the latent image forming body (1) is observed from the second angle (α _B ). The viewpoint (10B) is on an extension line (illustrated by a broken line) connecting the second latent image element (7B) and the center (O) of the microlens, and the retroreflective material (3). 2 shows the viewpoint of the observer located on the exposed side of the micro lens (5), and the light source (9B) connects the second latent image element (7B) and the center (O) of the micro lens. The light source is located on an extended line of the line and located on the surface opposite to the observer's viewpoint with the latent image forming body (1) interposed therebetween. In FIG. 8, the viewpoint (10C) shows a state in which the latent image forming body (1) is observed from the third angle (α _C ). The viewpoint (10C) is on an extension line (illustrated by a broken line) connecting the third latent image element (7C) and the center (O) of the microlens, and the retroreflective material (3). The viewpoint of the observer located on the exposed side of the micro lens (5) is shown, and the light source (9C) connects the third latent image element (7C) and the center (O) of the micro lens. The light source is located on an extended line of the line and located on the surface opposite to the observer's viewpoint with the latent image forming body (1) interposed therebetween.

  In such an arrangement of the latent image forming body (1), the light sources (9A, 9B, 9C) and the viewpoints (10A, 10B, 10C), when the transmitted light is observed from the viewpoint (10A), the light source (9A) Light passes through the first latent image element (7A), and the light transmitted through the first latent image element (7A) reaches the observer's viewpoint (10A) through the microlens (5). On the other hand, the light from the light source (9B) is transmitted through the second latent image element (7B), but the light transmitted through the second latent image element (7B) is refracted by the microlens (5). Therefore, the viewpoint (10A) does not reach or even if it reaches, the transmitted light amount is extremely small, and the visibility of the first latent image (8A) is not affected. Similarly, the light from the light source (9C) is transmitted through the third latent image element (7C), but the light transmitted through the third latent image element (7C) is refracted by the microlens (5). Therefore, the viewpoint (10A) does not reach or even if it reaches, the transmitted light amount is extremely small, and the visibility of the first latent image (8A) is not affected.

  Then, the case where it observes from a viewpoint (10B) is demonstrated. When the transmitted light is observed from the viewpoint (10B), the light from the light source (9B) is transmitted through the second latent image element (7B), and the light transmitted through the second latent image element (7B) is a microlens. The observer's viewpoint (10B) is reached through (5). On the other hand, the light from the light source (9A) is transmitted through the first latent image element (7A), but the light transmitted through the first latent image element (7A) is refracted by the microlens (5). Therefore, the viewpoint (10B) does not reach or even if it reaches, the transmitted light amount is extremely small, and the visibility of the second latent image (8B) is not affected. Similarly, the light from the light source (9C) is transmitted through the third latent image element (7C), but the light transmitted through the third latent image element (7C) is refracted by the microlens (5). Therefore, the viewpoint (10B) does not reach or even if it reaches, the transmitted light amount is extremely small, and the visibility of the second latent image (8B) is not affected. When observed from the viewpoint (10C), the light transmitted through the third latent image element (7C) of the light source (9C) reaches the viewpoint (10C) according to the principle described above, and the light sources (9A, 9B). ) Does not affect the visibility of the third latent image (8C). Thus, the latent image forming body (1) of the present invention selects only the light of the light source (9) located on the extension line of the line connecting the center (O) of the microlens and the latent image element (7). The viewpoint (10) visually recognizes the light of the light source (9) that is transmitted through the latent image element (7) formed on the light shielding layer (6). The latent image (8) formed by the set of image image elements (7) can be observed. Therefore, the latent image forming body (1) of the present invention is observed by changing the viewing position as in the viewpoints (10A, 10B, 10C), thereby changing the three latent image images (8). The

  Actually, the environment in which the latent image (8) of the latent image forming body (1) of the present invention can be observed includes the center (O) of the microlens and the latent image element (7) shown in FIG. It is not limited to the environment where light is emitted from the light source (9) located on the extended line of the connecting line, but in the general environment where we live, illuminated by sunlight or fluorescent lights. no problem. The latent image (8) can be observed by observing the latent image forming body (1) of the present invention with transmitted light over the sun or fluorescent lamp existing indoors or outdoors.

  In the present embodiment, the example in which the latent image (8) is composed of “a female face observed from different directions” has been described, but each of the latent image (8) of the present invention is Since it consists of a set of minute latent image elements (7), even an image that requires high resolution can be formed. Further, the latent image (8) having a complex gradation such as a human face or landscape can be formed by the density of the latent image element (7) formed on the light blocking layer (6).

  In the present embodiment, the example in which the three latent image images (8) are formed tilted about the Y axis has been described. However, the latent image image (8) is formed tilted about the X axis. In the case where the latent image (8) is observed by changing the position of the viewpoint (10) in the Y-axis direction, and the latent image (8) is formed tilted to each of the XY axes, the XY axis The latent image (8) is observed by changing the position of the viewpoint (10) around the center.

  Further, in the present embodiment, in order to clearly explain the principle and effect of the invention, an example in which three latent image images (8) are formed has been described. However, a large number of latent image images (8) are formed. Thus, an image having a natural three-dimensional effect can be made to appear, and further, a moving image visual effect described later in the second embodiment and all other visual effects such as simple changing, morphing, and zooming can be formed. Can do.

  In the present invention, the angle range in which one latent image (8) drawn with the laser beam (11) is visible is determined by the intensity of the laser beam (11) at the time of drawing. Since it depends on the resolution of (8) and its gradation, etc., it is necessary to adjust the output of the laser beam (11) in accordance with the resolution and design of the latent image (8). Further, it is necessary to adjust the output of the laser beam (11) according to the resolution and design of the latent image (8) so as not to affect the observation of the adjacent latent image (8). The adjacent latent image (8) is the second latent image (8B) with respect to the first latent image (8A) referred to in the present embodiment, and the third latent image ( 8C) is the second latent image (8B), and the second latent image (8B) is the first latent image (8A) and the third latent image (8C). Thus, in the plurality of latent image images (8) formed by the latent image elements (7) having different angles, the latent image element (7) having the closest angle with respect to one latent image (8). The latent image (8) formed by Specifically, the irradiation angle of the laser beam (11) for forming one latent image (8) and the irradiation angle of the laser beam (11) for forming the latent image (8) adjacent thereto. If the difference between the two is too small, the adjacent latent image (8) interferes and becomes white. On the contrary, if the difference in the angle at which the laser beam (11) for forming the adjacent latent image (8) is irradiated is too large, when the latent image (8) is observed, nothing is observed. As a result, it becomes impossible to express a moving image or a stereoscopic image in which the latent image (8) appears continuously. Therefore, it is necessary to adjust the irradiation angle of the laser beam (11) for forming the adjacent latent image (8).

  Hereinafter, embodiments of the latent image forming body specifically produced according to the best mode for carrying out the invention will be described in detail. However, the present invention is not limited to the embodiments. Absent.

Example 1
In Example 1, an example of the latent image forming body (1-1) provided with a natural three-dimensional effect by arranging images with slightly different observation angles according to a certain rule will be described. FIG. 9 shows the latent image forming body (1-1) in the first embodiment. The latent image forming body (1-1) of Example 1 was formed by pasting the retroreflective material (3-1) on the transparent plastic substrate (2-1). In addition, Daiso Sangyo Co., Ltd. reflective seal | sticker was used for the retroreflection material (3-1). Then, a latent image (8-1) of “a female face observed from different directions” was formed on the retroreflective material (3-1).

  Next, details of the latent image (8-1) will be described. 9 shows only one latent image (8-1) for the sake of convenience, the latent image (8-1) of the latent image forming body (1) of Example 1 is shown in FIG. Thus, it is composed of female face images observed from 36 different directions, and 36 face images are formed on the retroreflective material (3-1) as a first latent image, a second latent image, and so on. A 36th latent image was formed. In the first embodiment, in order to distinguish the 36 latent image images (8-1), the codes shown in FIG. 10 are used for each latent image image (8-1). The meaning of the sign will be described later.

  In FIG. 10, a latent image (8-1) arranged on a straight line in the B direction with the center position (A) as a reference position is an image when a female face is observed from the left direction, As the distance from the center position (A) increases, the angle observed from the left direction gradually increases. In FIG. 10, a latent image (8-1) arranged on a straight line in the direction C with the center position (A) as a reference position is an image when a female face is observed from the right direction, As the distance from the center position (A) increases, the angle observed from the right direction gradually increases. In FIG. 10, the latent image (8-1) arranged on a straight line in the direction D with the center position (A) as a reference position is an image when a female face is observed from above, As the distance from the central position (A) increases, the angle observed from above is gradually increased. In FIG. 10, a latent image (8-1) arranged on a straight line toward the E direction with the center position (A) as a reference position is an image when a female face is observed from below, As the distance from the central position (A) increases, the angle of observation from below is gradually increased.

  Then, the code | symbol of the latent image (8-1) shown in FIG. 10 is demonstrated. For example, in the code “8-B1-D4-11”, the codes “B1” and “D1” indicate that the images are arranged in the B direction and the D direction, respectively. The number “D4” means that the first row is arranged in the B direction and the fourth row is arranged in the D direction. The first row is an image observed from a position shifted in each direction of 3 degrees, the second row is 6 degrees, the third row is 9 degrees, the fourth row is 12 degrees, and the fifth row is 15 degrees. Accordingly, the reference numeral “8-B1-D4-11” is a position shifted by 3 degrees in the B direction, that is, leftward with respect to the female face, and shifted by 12 degrees upward with respect to the female face. It shows that the image was observed from a certain position. The last number in the code indicates the number of the latent image, and in the case of “8-B1-D4-11”, it indicates the eleventh latent image. .

  As described above, the latent image (8-1) of Example 1 was configured as a regular image in which the observation angle changes by 3 degrees each time the number of code columns increases by one. The above images were created by 3DCG software (Newtek Lightwave). The resolution of these images was 500 dpi, and the image size was 35 mm × 35 mm. The laser marker (MD-V manufactured by Keyence) used to form the latent image (8-1) is a portion having a high density when the input image is converted into a grayscale image, for example, a female Laser light is applied to the eyes and eyes of the face. For this reason, when the latent image (8-1) shown in FIG. 10 is drawn with a laser marker, the density of the image is inverted.

  The retroreflective material (3-1) shown in FIG. 11 (a) is placed horizontally on the 36 latent image images (8-1) having the above configuration, and the retroreflective material (3-1) is placed on the retroreflective material (3-1). Drawing was performed in the order shown below using a laser marker on the basis of the state in which the laser beam (11) is irradiated from the vertical direction. The laser beam (10) used was an infrared laser with a wavelength of 1090 nm, the output of the laser beam (11) for forming 36 latent image images (8-1) was constant, and the laser power was 4 0.5%, scan speed 4000 mm / s, Q switch frequency 100 kHz.

  First, in order to form the thirteenth latent image (8-B1-0-13), as shown in FIG. 11B, the retroreflective material (3-1) with respect to the reference and the Y axis The 13th latent image (8-B1-0-13) was drawn directly on the retroreflective material (3-1) with a laser beam (11) in a state where it was tilted clockwise by 3 degrees. After the drawing of the thirteenth latent image (8-B1-0-13) is completed, the fifth latent image ((3)) is tilted 9 degrees in the same direction from the reference. 8-B3-0-5) was drawn. After the drawing of the fifth latent image (8-B3-0-5) is completed, the first latent image ((3)) is tilted 15 degrees in the same direction from the reference. 8-B5-0-1) was drawn.

  Subsequently, in order to form a latent image (8-1) with the code “C1”, as shown in FIG. 11 (c), the retroreflective material (3-1) is placed on the Y axis with respect to the reference. The 24th latent image (8-C1-0-24) was drawn with a laser beam (11) in a state of being tilted 3 degrees counterclockwise from the center. Further, every time the numeral of the code increases, the angle of inclination of the base material (2) is increased by 3 degrees to draw the laser beam (11), and the 32nd latent image (8-C3-0-32) and the 36 latent image images (8-C5-0-36) were formed.

  Subsequently, in order to form a latent image (8-1) with a code “D1”, as shown in FIG. 11 (d), the retroreflective material (3-1) is placed on the X axis with respect to the reference. The eighteenth latent image (8-0-D1-18) was drawn with a laser beam (11) in a state tilted clockwise by 3 degrees to the center. Further, each time the numeral of the code increases, the angle of inclination of the base material (2) is increased by 3 degrees to draw the laser beam (11), and the 17th latent image (8-0-D3-17) and the Sixteen latent image images (8-0-D5-16) were formed.

  Subsequently, in order to form a latent image (8-1) with the code “E1”, as shown in FIG. 11 (e), the retroreflective material (3-1) is placed on the X axis with respect to the reference. A nineteenth latent image (8-0-E1-19) was drawn with a laser beam (11) in a state of being tilted 3 degrees counterclockwise from the center. In addition, every time the numeral of the code increases, the angle of inclination of the base material (2) is increased by 3 degrees to draw the laser beam (11), and the 20th latent image (8-0-E3-20) and the 20th latent image are drawn. 21 latent image images (8-0-E5-21) were formed.

  With the above procedure, the retroreflective material (3-1) is tilted to the X axis and the Y axis, respectively, and the laser beam (11) is irradiated from each direction, so that 36 latent image images (8-1) are obtained. Drawing was performed to produce a latent image forming body (1-1) of the present invention. In the produced latent image forming body (1-1), all 36 latent image images (8-) are formed in the light blocking layer (6-1) adjacent to the plurality of microlenses (5-1). If the light blocking layer (6-1) having the latent image element (7-1) of 1) exists temporarily, as shown in FIG. 12, 36 different latent image elements (7-1) The light blocking layer (6-1) is not overlapped but is formed at a constant interval (in FIG. 12, the number of 36 latent image image elements (7-1) is 36). Corresponding to the sign of the latent image (8-1). On the other hand, as described above, the latent image element (7-1) is placed on the light blocking layer (6-1) adjacent to the microlens (5-1) which is not at the position corresponding to the latent image (8-1). Is not formed.

  When the latent image forming body (1-1) produced by the above procedure is observed by tilting it at a predetermined angle (α) under transmitted light, the latent image (8-1) corresponds to the observation angle. The direction of the woman's face changes and is observed. For example, when the left end of the base material (2-1) shown in FIG. 9 is tilted so as to gradually approach the viewer, the latent image (8-1) changes to the left direction. 9 is gradually changed to a female face image viewed from above, and when the right end of the base material (2-1) shown in FIG. 9 is gradually inclined closer to the observer, the latent image (8-1) Since it gradually changes to a female face image viewed from the right direction, it is possible to obtain a visual effect as if a real three-dimensional object exists in the image.

  In addition, since our right eye and left eye are separated by 70 to 75 mm in the horizontal direction, when the observer observes the latent image forming body (1-1), the latent image is formed between the right eye and the left eye. The angle with respect to the formed body (1-1) is slightly different. Due to this angular difference, an observer who observes the latent image forming body (1-1) captures different latent image (8-1) between the right eye and the left eye. For example, if the right eye captures the 24th latent image (8-C1-0-24) shown in FIG. 10, the left eye receives the 13th latent image (8-B1-0-) shown in FIG. 13). This is exactly the same as the parallax that normally occurs when observing a three-dimensional structure that actually exists, so that the latent image forming body (1-1) is not tilted, and is simply transmitted directly facing. The latent image (8-1) is observed with a natural three-dimensional effect only by observing with light. In addition, even if the base material (2) is tilted in any direction, up, down, left, or right, the image observed with the right eye and the image observed with the left eye are slightly different, as in the case of observing with the front facing. Therefore, a natural stereoscopic effect due to binocular parallax is exhibited.

  As described above, when the image is observed at a predetermined angle (α) under transmitted light from any direction, the latent image (8-1) in the latent image print (1-1) has a three-dimensional effect. Moreover, the orientation of a woman's face naturally changes in response to changes in each observation angle. By these effects, the female face which is the latent image (8-1) in the latent image forming body (1-1) is observed with a stereoscopic effect as if the woman is present there. The

(Example 2)
In the second embodiment, as in the first embodiment, a large number of images with slightly different viewing angles are arranged in the left-right direction, and a large number of images with slightly different shapes are arranged in the vertical direction. An example of the latent image forming body (1-2) to which a moving visual effect is imparted will be described. Further, in Example 2, an example of the valuable printing sheet (30) provided with the latent image forming body (1-2) will be described. The latent image forming body (1-2) of the second embodiment will be described with respect to differences from the first embodiment.

  As shown in FIG. 13, the latent image forming body (1-2) of Example 2 formed a chromatic pattern as a latent image (8-2). In addition, the structure of a base material (2-2) and a retroreflection material (3-2) is the same as Example 1. FIG.

  Next, details of the latent image (8-2) will be described. FIG. 13 shows only one latent image (8-2) for convenience, but the latent image (8-2) of Example 2 has 25 different colors as shown in FIG. The pattern was composed of a pattern, and 25 chromatic patterns were formed on the retroreflective material (3-2) as a first latent image, a second latent image, and a 25th latent image. In Example 2, in order to distinguish the 25 latent image images (8-2), the codes shown in FIG. 14 are used for each latent image image (8-2). The meaning of the sign will be described later.

  In FIG. 14, the latent image (8-2) arranged on a straight line in the direction B with the center position (A) as the reference position is observed from the left in the same way as in the first embodiment. As the image moves away from the center position (A), the angle observed from the left direction gradually increases. In FIG. 14, a latent image (8-2) arranged on a straight line in the direction C with the center position (A) as a reference position is an image obtained when the chromatic pattern is observed from the right direction. The angle observed from the right direction gradually increases as the distance from the center position (A) increases. The codes in the B direction and the C direction indicating the latent image (8-2) are the same as those in the first embodiment. The first row is 3 degrees, the second row is 6 degrees, and the third row is 9 degrees. The fourth row is an image observed from a position shifted in each direction of 12 degrees and the fifth row is 15 degrees. The last number in the code is the same as that in the first embodiment, and indicates the number of the latent image.

  In the vertical direction (D direction and E direction), as described above, images having different shapes are arranged. In this embodiment, it is intended to compose a moving image in which the scented pattern is regarded as a flower, and the flower changes from a cocoon state to an image that opens widely. The condition is different. For example, in the D direction, the twelfth latent image (8-0-D1-12) is slightly larger than the thirteenth latent image (8-0-0-13) at the position (A). Is an open image, and the eleventh latent image (8-0-D2-11) is an image in which the petals are larger. In the E direction, the fourteenth latent image (8-0-E1-14) is slightly petal based on the thirteenth latent image (8-0-0-13) at the position (A). Is a closed image, and in the fifteenth latent image (8-0-E2-15), the petals are in a closed eyelid state. As described above, when the code indicating the latent image (8-2) increases in the D direction, an image in which the petals are opened is obtained, and when the code in the E direction is increased, an image in which the petals are closed is obtained.

  The above images were created by 3DCG software (Newtek Lightwave). All of these images had a resolution of 350 dpi, and the image size was 30 mm × 30 mm. In addition, the image created by 3DCG software produced the image which carried out the gray scale inversion with respect to the latent image (8-2) shown in FIG.

  The twenty-five latent image images (8-2) having the above-described configuration are placed horizontally on the retroreflecting material (3-2) shown in FIG. Drawing was performed in the order shown below using a laser marker on the basis of the state in which the laser beam (11) is irradiated from the vertical direction. The laser beam (10) used was an infrared laser with a wavelength of 1090 nm, the output of the laser beam (11) for forming 25 latent image images (8-2) was constant, and the laser power was 4 0.0%, scan speed 6000 mm / s, and Q switch frequency 100 kHz.

  First, as shown in FIG. 11A, the thirteenth latent image (8-0-0-13) was directly drawn on the retroreflective material (3-1) with a laser beam (11). Subsequently, as shown in FIG. 11B, the retroreflective material (3-2) is tilted by 3 degrees clockwise around the Y axis with respect to the reference, and the eighth latent image ( 8-B1-0-8) was directly drawn on the retroreflective material (3-2) by laser light. After the drawing of the eighth latent image (8-B1-0-8) is completed, the third latent image ((3-2) is tilted 6 degrees in the same direction from the reference). 8-B2-0-3) was drawn.

  In order to form the latent image (8-2) with the sign “C1”, the retroreflective material (3-2) is turned around the Y axis with respect to the reference as shown in FIG. The eighteenth latent image (8-C1-0-18) was drawn with a laser beam (11) in a state tilted by 3 degrees clockwise. After the drawing of the eighteenth latent image (8-C1-0-18) is completed, the twenty-third latent image ((3-2) is tilted 6 degrees in the same direction from the reference). 8-C2-0-23) was drawn. Similarly, when forming the latent image (8-2) with the sign “D1”, the retroreflective material (3-2) is tilted 3 degrees clockwise around the X axis with respect to the reference. In this state, the drawing was performed by increasing the tilt angle of the retroreflective material (3-2) by 3 degrees each time the number of the code increased. Further, when forming the latent image (8-2) with the code “E1”, the retroreflective material (3-2) is tilted 3 degrees counterclockwise around the X axis with respect to the reference. Drawing was performed in a state, and the angle of inclination of the retroreflective material (3-2) was increased by 3 degrees each time the number of the code increased.

  In the above procedure, the retroreflective material (3-2) is tilted to the X axis and the Y axis, respectively, and the laser beam (11) is irradiated from each direction to obtain 25 latent image images (8-3). Drawn.

  When the latent image forming body (1-2) produced by the above procedure is observed by tilting it by 6 degrees in the vertical direction (D direction and E direction) under transmitted light, the closed eyelids are opened and the flower is formed. Or a moving visual effect that closes an open flower to a cocoon. In addition, since the chromatic pattern images observed from slightly different angles are formed in the left and right directions (B direction and C direction), the same stereoscopic effect based on binocular parallax as in the first embodiment is also manifested. To do. In this way, the latent image forming body (1-2) can actually exhibit a stereoscopic visual effect and a moving image visual effect at the same time.

As shown in FIG. 15A, the latent image forming body (1-2) produced as described above was pasted on the sheet base material (31) to produce a valuable printing sheet (30). . Note that a paper material having a basis weight of 52 g / m ² , a thickness of 65 μm, and a transmittance of 23% was used for the sheet base material (31). The precious printed sheet (30) was prepared as an identification card, and as shown in FIG. 15 (b), certificate information consisting of name, address, and date of issue on the sheet substrate (31). (32) and the printed pattern (33) were printed.

  In this way, the latent image forming body (1-2) produced in the plastic material is observed on the precious printed sheet (30) produced by laminating the sheet base material (31) made of paper material with transmitted light. The latent image (8-2) could be observed. In Example 2, an identification card is used as an example, but the latent image forming body (1) of the present invention is formed on a security printed matter such as a banknote, passport, securities, and passport. Thus, authenticity determination can be performed and counterfeiting can be prevented.

(Example 3)
Example 3 is a latent image image forming body in which the latent image (8-3) observed when tilted at a predetermined angle (α) under transmitted light is different from that of Example 1 in a different pattern. (1-3). Regarding the latent image forming body (1-3) of the third embodiment, differences from the first embodiment will be described.

  FIG. 16A is a diagram illustrating the latent image forming body (1-3) of the third embodiment. In the latent image forming body (1-3) of Example 3, the number “n” of the latent image (8-3) is 3, and the first latent image (8-3-1) is shown in FIG. The character “OK” shown in b), the second latent image (8-3-2) is “face” shown in FIG. 16C, and the third latent image (8-3-3) is shown in FIG. 16 (d).

  Then, in order to form the first latent image (8-3-1), the retroreflective material (3-3) is tilted 10 degrees in the clockwise direction around the Y axis, and the first latent image is formed. The portion corresponding to the image (8-3-1) was irradiated with a laser beam (11). Next, in order to form a second latent image (8-3-2), the second latent image (8-3-2) is in a state where the retroreflective material (3-3) is parallel to the X axis. The portion corresponding to 2) was irradiated with laser light (11). Next, the portion corresponding to the third latent image (8-3-3) was irradiated with the laser beam (11) at an angle of 10 degrees counterclockwise about the Y axis.

  When the latent image forming body (1-3) produced by the above procedure is observed with transmitted light from the front, the second latent image (8B-3-2) shown in FIG. 16B is observed. When the base material (2-3) is observed with transmitted light after being tilted by 10 degrees clockwise around the Y axis, the first latent image (8-3-1) shown in FIG. ) Is observed, and the base material (2-3) is tilted 10 degrees counterclockwise about the Y axis, and is observed with transmitted light, the third latent image (shown in FIG. 16C) ( 8-3-3) was observed. Thus, in the latent image forming body (1-3) of Example 4, when the substrate (2-3) is tilted and observed with transmitted light, a different latent image (8-3) was observed. .

DESCRIPTION OF SYMBOLS 1 Latent image formation body 2 Base material 3 Retroreflective material 4 Adhesive resin layer 5 Micro lens 6 Light blocking layer 7 Latent image element 8 Latent image 9 Light source 10 View point 11 Laser light
DESCRIPTION OF SYMBOLS 20 Processing apparatus 21 Computer 22 Laser processing apparatus 23 Rotary stage 24x, 24y Spindle 30 Precious printing sheet 31 Sheet base material 32 Certificate information 33 Printing pattern 1-1 Latent image image forming body (Example 1)
2-1 Substrate 3-1 Retroreflective material 8-1 Latent image image 1-2 Latent image image forming body (Example 2)
2-2 Base material 3-2 Retroreflective material 8-2 Latent image image 1-3 Latent image image forming body (Example 3)
2-3 Base material 3-3 Retroreflective material 8-3 Latent image

Claims (2)

A retroreflective material having a plurality of microlenses and a light blocking layer adjacent to the microlens is laminated on at least a part of a light-transmitting substrate, and the light blocking layer corresponding to one microlens Has at least one latent image element composed of a through-hole, and the at least one latent image element has a first angle, a second angle,. any one of a first latent image element formed by an angle of n (n is a natural number of 2 or more), a second latent image element,. A first latent image is formed by the set of latent image elements, and a second latent image is formed by the set of second latent image elements. An nth latent image is formed by the assembly,
The first angle, the second angle,..., The nth angle (n is a natural number of 2 or more) are angles for observing one arbitrary three-dimensional object from different angles. An image image, a second latent image,..., An n-th latent image is obtained by converting one arbitrary three-dimensional object into a first angle, a second angle,. Composed of different images observed from the above natural numbers)
A latent image forming body, wherein the arbitrary three-dimensional object is stereoscopically observed as a latent image in observation with transmitted light. On the light blocking layer corresponding to one microlens , the first latent image element, the second latent image element, ..., the nth latent image element (n is a natural number of 2 or more) 2. The latent image forming body according to claim 1, wherein two or more different latent image elements are formed.

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