JP2016112802A - Image formation body and identification program thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image formation body or an identification program thereof, capable of identifying-determining truth or falsehood of a personal authentication medium of recording individual information, by using a generally easily-acquirable device such as an image pickup device attached with an angle sensor and an illumination part included in a camera and a portable camera of a normally used portable information terminal.SOLUTION: In an image formation body, at least a transferrable image receiving layer 23 is formed on a support body 21, and a surface of the image receiving layer 23 having an image formation layer thermally transferred, of an intermediate transfer medium 20 having the image formation layer thermally transferred to the image receiving layer 23 from a thermal transfer recording medium in which the image formation layer is transferrably formed on the support body, is heated and pressurized by superposing toward a transfer object surface of a transfer object body 40, so that the image formation layer is transferred on the transfer object body 40 together with the image receiving layer 23. In the image formation body, the intermediate transfer medium 20 or the thermal transfer recording medium is provided with a layer including a phosphor for emitting the visible light by exciting by the visible light.SELECTED DRAWING: Figure 4

Description

  The present invention particularly relates to an image forming body using an image display technique capable of recording individual information that can be used for personal authentication, and an identification program for performing authenticity determination thereof.

Many personal authentication media such as passports and ID (identification) cards use facial images to enable visual personal authentication.
Conventionally, for example, in a passport, a photographic paper on which a face image is printed is pasted on a booklet. However, such passports may be tampered with by reprinting photographic prints.

  For this reason, in recent years, there is a tendency to digitize facial image information and reproduce it on a booklet. As this image reproduction method, for example, a thermal transfer recording method using a transfer ribbon has been studied.

  One means for creating a personal authentication medium by the thermal transfer recording method is to form and carry information such as images and characters on an intermediate transfer medium, and further transfer and form it on an information recording transfer medium comprising a substrate. is there.

  An intermediate transfer medium capable of thermal transfer used for creating a personal authentication medium includes a support and a transfer layer in which a release layer, an intermediate layer, an adhesive layer, and the like are provided in this order on the support. In the use of the intermediate transfer medium, the transfer layer side is superimposed on the substrate of the information recording transfer target body and pressed, and the transfer layer is transferred to the substrate by heating from either the support side or the substrate side.

  A peeling layer is a layer provided in order to implement | achieve these favorable peeling, when the interface of a support body and a transfer layer does not peel well in the case of transcription | transfer by the compatibility of each material.

  The intermediate layer is a layer existing between the adhesive layer and the release layer, and is appropriately designed as necessary. Examples of the intermediate layer include a layer for improving the adhesive force between the two, or a layer for preventing forgery and improving decorativeness, for example, an OVD (Optical Variable Device) forming layer having a diffractive structure.

  The adhesive layer is a layer that adheres to the substrate by heat and pressure, and can be an image receiving layer / adhesive layer that also serves as an image receiving layer that forms information such as images and characters with a heat transfer material.

  The image receiving layer and the image receiving layer / adhesive layer are layers having image receptivity capable of recording image information (including characters and symbols) without a printing plate by a thermal transfer printer or an ink jet printer. It is possible to provide a printed image with a dye or pigment prior to transfer.

  Information is formed on the image-receiving layer / adhesive layer by transferring the intermediate transfer medium to a transfer device, the main part of which is composed of a drum and a thermal head, and the color material layer of the thermal transfer recording medium in which the color material is a heat transfer material. Is brought into contact with the image receiving layer / adhesive layer of the intermediate transfer medium, the thermal head is pressed from the thermal transfer recording medium side, and the heating element group of the thermal head is appropriately heated on the basis of the image data to generate image data. A method of forming and printing an image pattern based on the image receiving layer / adhesive layer is employed.

  An example of a method for transferring an image pattern to a substrate using such an intermediate transfer medium is to bring the adhesive layer or the image receiving layer / adhesive layer of the intermediate transfer medium into contact with the transfer surface of the transfer object, and A heating medium such as a heat roll or a hot plate is pressed from the support side of the intermediate transfer medium, heated to the transfer temperature, and the adhesive layer is pressure-bonded to the substrate to be transferred, and the support of the intermediate transfer medium is peeled off. . Thereby, a personal authentication medium can be obtained.

  On the other hand, in another method for forming information on the image-receiving layer / adhesive layer, a peeling layer on a substrate, an image forming layer formed with a relief hologram or diffraction grating composed of a fine uneven pattern, and the fine unevenness A thermal transfer recording medium provided with a transparent thin film layer formed along the surface and having a refractive index higher than that of the image forming layer in this order is prepared.

  By making the transparent thin film layer side of the heat transfer recording medium of such a heat transfer material abut the image receiving layer / adhesive layer of the intermediate transfer medium and subjecting the heat transfer recording medium to selective heating based on image information. Then, an image pattern of individual information by a relief hologram or a diffraction grating is thermally transferred and recorded on the image receiving layer / adhesive layer of the intermediate transfer medium.

  As described above, personal authentication media that records individual information using relief holograms or diffraction gratings are said to be difficult to be counterfeited and tampered by a third party, but are always required to incorporate new anti-counterfeiting technologies. In addition, there is a need for a true / false discrimination method that can determine whether a product is genuine.

  Among the above authenticity determination methods, there are methods using infrared absorbing ink or fluorescent light emitting ink. Among these, fluorescent light-emitting inks include inks that are difficult to see with the naked eye under normal visible light, and that can detect a mark visually or with a detector when irradiated with ultraviolet rays or infrared rays.

  Various proposals have been made on the fluorescent ink in order to prevent forgery and alteration. For example, an image is formed on a substrate using ink containing three types of phosphors that emit light of R (red), G (green), and B (blue) when excited with ultraviolet rays. Although not visible, there has been proposed an image forming method that emits RGB light when irradiated with excitation light so that a fluorescent image appears by additive color mixing. (See Patent Document 1)

JP-A-10-35089

  As described above, the method of transferring individual information as an image pattern to a base material using an intermediate transfer medium in a personal authentication medium does not include a true / false discrimination method capable of determining whether or not it is a genuine product. There was a point.

  The present invention has been made paying attention to the above-mentioned problems, and is generally easily hand-held, such as an image pickup apparatus attached with an angle sensor and an illumination unit included in a camera of a commonly used portable information terminal or a portable camera. It is an object of the present invention to provide an image forming body capable of discriminating / determining authenticity of a personal authentication medium in which individual information is recorded, or an identification program thereof using an apparatus to be entered.

As means for solving the above problems, according to the first aspect of the present invention, at least a transferable image-receiving layer is formed on a support, and an image-forming layer is formed on the support so as to be transferable. The intermediate transfer medium having the image-forming layer thermally transferred from the recording medium to the image-receiving layer, the surface of the image-receiving layer having the image-forming layer thermally transferred onto the surface to be transferred of the transfer medium is superimposed and heated. In the image forming body in which the image forming layer and the image receiving layer are transferred onto the transfer target body by applying pressure, the intermediate transfer medium or the heat-sensitive transfer recording medium is excited by visible light and emits visible light. There is provided an image forming body characterized in that a layer containing the body is provided.

  According to a second aspect of the present invention, in the first aspect, the layer containing a phosphor that is excited by the visible light and emits visible light is the image receiving layer of the intermediate transfer medium. The body is provided.

  According to a third aspect of the present invention, in the first aspect, the layer containing a phosphor that is excited by the visible light and emits visible light is the image forming layer of the thermal transfer recording medium. An image forming body is provided.

  According to the fourth aspect of the present invention, in any one of the first to third aspects, the layer containing a phosphor that is excited by the visible light and emits visible light includes the image receiving layer of the intermediate transfer medium and the layer. The phosphorescent color wavelength distribution of the phosphor of the thermal transfer recording medium is different from the phosphorescent wavelength distribution of the image forming layer of the thermal transfer recording medium. An image forming body is provided.

According to a fifth aspect of the present invention, an imaging unit, an angle sensor that measures an angle of the imaging unit for providing imaging conditions, an illumination unit that emits visible light that excites the phosphor, and a display unit A program for causing the control unit of the apparatus including the control unit to control each unit to perform control for determining the authenticity of the image forming body on any one of the first side surface to the fourth side surface,
Irradiating the illumination unit with the visible light when the imaging unit satisfies an imaging condition, and instructing the imaging unit to image the image forming unit after a predetermined time from the irradiation. Generating an imaging instruction to be performed, and determining whether the image forming body is authentic or not based on whether or not the emission of the phosphor is identified from the captured image of the image forming body, and displaying the determination result on the display unit And a step of causing the control unit to execute an identifying program.

  According to the sixth aspect of the present invention, the authenticity of the image forming body is determined based on whether or not wavelength distributions of two different phosphorescent colors are identified from the image of the image forming body captured in the fifth aspect. An identification program is provided that causes the control unit to execute a step of determining and displaying the determination result on the display unit.

  According to the first aspect of the present invention, the intermediate transfer medium or the thermal transfer recording medium is provided with a layer containing a phosphor that is excited by visible light and emits visible light. It is possible to identify the presence or absence of a phenomenon, and it is possible to provide an image forming body capable of discriminating and determining authenticity.

  According to the second aspect of the present invention, the intermediate transfer medium of the image forming body is transferred by using the phosphor-containing layer excited by visible light and emitting visible light as the image receiving layer of the intermediate transfer medium. In the region, it is possible to identify the presence or absence of the phosphorescence phenomenon due to the irradiation of white light, and it is possible to provide an image forming body capable of discriminating and determining authenticity.

According to the third aspect of the present invention, a layer containing a phosphor that is excited by visible light and emits visible light is used as an image forming layer of a heat-sensitive transfer recording medium, so that the heat-sensitive recording medium of the image-forming body is sensitive. In the thermally transferred region, it is possible to identify the presence or absence of a phosphorescence phenomenon due to the irradiation of white light, and it is possible to provide an image forming body capable of discriminating and determining authenticity.

  According to the fourth aspect of the present invention, a layer containing a phosphor that is excited by visible light and emits visible light is used as an image receiving layer of an intermediate transfer medium and an image forming layer of a thermal transfer recording medium, and the phosphor of the image receiving layer By making the phosphorescent wavelength distribution of the phosphor layer different from that of the image forming layer of the thermal transfer recording medium, it is possible to distinguish two different phosphorescent wavelength distributions in these two regions. Thus, it is possible to provide an image forming body capable of discriminating and determining authenticity.

According to the fifth aspect of the present invention, an imaging unit, an angle sensor that measures an angle of the imaging unit for providing imaging conditions, an illumination unit that emits visible light that excites the phosphor, and a display unit And a control unit that controls the respective units to cause the control unit to perform control for determining the authenticity of any one of the first side surface to the fourth side image forming body. ,
Irradiating the illumination unit with the visible light when the imaging unit satisfies an imaging condition, and instructing the imaging unit to image the image forming unit after a predetermined time from the irradiation. Generating an imaging instruction to be performed, and determining whether the image forming body is authentic or not based on whether or not the emission of the phosphor is identified from the captured image of the image forming body, and displaying the determination result on the display unit And causing the controller to execute the step of causing

  As a result, phosphor emission is identified using a device that is generally readily available, such as an image sensor with an angle sensor and an illumination unit included in a commonly used portable information terminal camera or portable camera. It is possible to provide an identification program that makes it possible to determine the authenticity of the image forming body depending on whether or not it is true.

  According to the sixth aspect of the present invention, the authenticity of the image forming body is determined by whether wavelength distributions of two different types of phosphorescent colors are identified from the image of the image forming body captured in the fifth aspect. And an angle sensor and an illumination unit included in a camera of a commonly used portable information terminal, a portable camera, and the like are included by causing the control unit to execute a step of displaying a determination result on the display unit. Whether or not two different phosphorescent wavelength distributions are discriminated in the image receiving layer of the intermediate transfer medium and the image forming layer of the thermal transfer recording medium using a device that is generally readily available, such as an image pickup device Thus, it is possible to provide an identification program that makes it possible to determine the authenticity of the image forming body.

  Therefore, the present invention records individual information using a device that is generally readily available, such as an image sensor equipped with an angle sensor and an illumination unit included in a commonly used portable information terminal camera or a portable camera. Thus, there is an effect that it is possible to provide an image forming body capable of discriminating and determining the authenticity of the personal authentication medium, or an identification program thereof.

1 is a cross-sectional view schematically showing a thermal transfer recording medium according to an aspect of the present invention. 1 is a cross-sectional view schematically showing an intermediate transfer medium according to an aspect of the present invention. FIG. 3 is a cross-sectional view schematically showing a state where the thermal transfer recording medium shown in FIG. 1 is thermally transferred to the intermediate transfer medium shown in FIG. 2. FIG. 4 is a cross-sectional view schematically showing an image forming body obtained by transferring the intermediate transfer medium shown in FIG. 3 to a transfer target. FIG. 10 is a block diagram illustrating a configuration example of an identification device according to an aspect of the present invention. It is a block diagram for demonstrating the imaging part which showed the example of a structure shown in FIG. FIG. 5 is an explanatory diagram for explaining an operation example for determining the authenticity of an image forming body using the identification device shown in FIG. 4 of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same referential mark is attached | subjected to the component which exhibits the same or similar function through all the drawings, and the overlapping description is abbreviate | omitted.

FIG. 1 is a cross-sectional view schematically showing a thermal transfer recording medium according to one embodiment of the present invention.
In the thermal transfer recording medium 10, a back coat 11 is formed on the back surface of a support 12, and a release layer 13, an image forming layer 14, a transmissive thin film layer 15 and an adhesive layer 16 are laminated on the surface of the support 12 in this order. It has a structure.

  The support 12 is, for example, a resin film or a sheet. The support 12 is made of a material having excellent heat resistance such as polyethylene terephthalate.

  The back coat 11 is provided to increase the adhesion to the thermal head, smooth the sliding, and improve the thermal conductivity. For example, silicon acrylate can be used.

  The release layer 13 serves to stabilize the release of the image forming layer 14 from the support 12. The release layer 13 is light transmissive and typically transparent. The release layer 13 can be made of, for example, a thermoplastic resin. The release layer 13 may be replaced with a release layer containing, for example, a fluororesin or a silicone resin.

  The image forming layer 14 includes at least one of a hologram and a diffraction grating as a diffraction structure. Here, the image forming layer 14 is a transparent layer having a relief structure as a diffractive structure on its surface. Examples of the material of the transparent layer include a photocurable resin, a thermosetting resin, or a thermoplastic resin. The image forming layer 14 may be a volume hologram.

  The transmissive thin film layer 15 is made of, for example, a transparent material having a refractive index different from that of the image forming layer 14. When the image forming layer 14 includes a diffraction grating, the luminance displayed by the diffraction structure of the image forming layer is improved. , The visibility of the image can be improved. The transparent thin film layer may have a single layer structure or a multilayer structure. In the latter case, the transmissive thin film layer may be designed to repeatedly cause reflection interference. The permeable thin film layer can be made from a transparent dielectric such as zinc sulfide and titanium dioxide. The transparent thin film layer can be formed by a vacuum film forming method such as vacuum evaporation or sputtering.

  The transmissive thin film layer 15 may be a metal layer having a thickness of less than 20 nm. The metal layer can be made from elemental metals such as chromium, nickel, aluminum, iron, titanium, silver, gold and copper or alloys thereof. The transmissive thin film layer 15 can be omitted.

  The adhesive layer 16 is made of a material that is melted by printing with a thermal head to cause adhesiveness, and is made of, for example, a thermoplastic resin.

  Here, the image forming layer 14 of the thermal transfer recording medium 10 contains a phosphor that is excited by visible light and emits visible light. Since the phosphor is excited by white light, particularly a white LED, it is necessary that at least the excitation wavelength is in the range of visible light from 400 nm to 700 nm. In addition, in order to detect with RGB using a simple imaging device such as CMOS, at least the phosphorescence wavelength is in the range of 400 nm to 700 nm. The layer containing a phosphor that is excited by visible light and emits visible light may be the release layer 13 or the adhesive layer 16.

  As long as it is within this range, there may be an excitation wavelength or phosphorescence wavelength in the ultraviolet or near infrared region. Instead of the phosphor color of the phosphor, the background color of the phosphor itself is preferably near white or light, but it may be the same color as the phosphor color or a different color. The phosphor is not particularly limited as long as the above conditions are satisfied. For example, a phosphor of SrSc2O4: Eu compound emitting red light described in Japanese Patent Publication No. 2009-161576 can be used.

  By the way, a light emitter is a substance that emits energy by absorbing light and emits light by absorbing light (ultraviolet / visible light) energy. Light has energy represented by E = hν (E: energy, h: Planck's constant, ν: frequency). When light hits a substance, the energy of the light may be absorbed by the substance, and the substance that is in a stable energy state (ground state) due to energy absorption temporarily becomes a high energy state (excited state). Become. The substance then releases energy and tries to return to a stable ground state. At this time, the phenomenon in which the energy of the difference is emitted as light instead of heat is referred to as light emission. In many substances, a part of the absorbed energy is emitted as thermal energy, so that light having a longer wavelength than that of the absorbed light is generated, but some light having a shorter wavelength is generated.

  Luminescence by light stimulation includes fluorescence and phosphorescence, but is sometimes called fluorescence as a major conclusion. In the present invention, phosphorescence and fluorescence are distinguished from each other. In fluorescence, part of the absorbed energy is released as heat and the remaining energy is released as light. On the other hand, heat is similarly released in the case of phosphorescence. At this time, phosphorescence is a phenomenon in which intersystem crossing occurs and the light does not return to the ground state immediately and continues to emit light slowly. In most cases, fluorescence is emitted on the order of nanoseconds, and phosphorescence is emitted on the order of microseconds to milliseconds.

  When a substance absorbs ultraviolet and visible light, an electronic transition occurs. These electrons have a spin direction, and there is a rule that two electrons exist in opposite directions (Pauli's exclusion principle). In normal excitation, the spin direction remains reversed. However, in the case of phosphorescence, intersystem crossing occurs, the spins are in the same direction, and cannot be returned to the ground state as it is, and it takes time to return to the ground state. Is.

  In the image forming body and the identification program thereof according to the present invention, the identification can be performed without installing a filter that does not allow excitation light to enter the imaging unit so that it can be detected by an apparatus that can be easily obtained by a general person. It is necessary to. For this reason, since it is preferable that the light is emitted for a long time after being excited, the phosphor needs to emit light in the order of microseconds to milliseconds.

  FIG. 2 is a cross-sectional view schematically showing an intermediate transfer medium according to an aspect of the present invention. In the intermediate transfer medium 20, a peeling layer 22 and an image receiving layer 23 are disposed on a support 21. The support 21 is a resin film or a sheet, for example. The support 21 is made of a material having excellent heat resistance such as polyethylene terephthalate.

  The peeling layer 22 is a layer provided in order to realize good peeling when the transfer layer does not peel well at the time of transfer due to the compatibility of the materials at the interface between the support 21 and the image receiving layer 23. is there. The release layer 22 can be made of, for example, a thermoplastic resin. The release layer 22 may be replaced with a release layer containing, for example, a fluororesin or a silicone resin. The release layer 22 is made of a material that also serves as a protective layer because it becomes the outermost surface when the support 21 is peeled after the transfer to the transfer surface of the transfer target.

  The image receiving layer 23 is a layer having an image receiving ability that can be transferred and recorded by the image forming layer 14, the transmissive thin film layer 15, and the adhesive layer 16 of the thermal transfer recording medium 10.

The image receiving layer 23 of the intermediate transfer medium 20 contains a phosphor that is excited by visible light and emits visible light. Here, the phosphorescent wavelength distribution of the phosphor of the image receiving layer 23 of the intermediate transfer medium 20 is different from the phosphorescent wavelength distribution of the image forming layer 14 of the thermal transfer recording medium 10. As a phosphor, for example, a phosphor of a green light emitting Si ₂ O ₂ N ₂ : Eu compound can be given. The layer containing a phosphor that is excited by visible light and emits visible light may be the release layer 22.

  Next, the printing method of the image forming body of the present invention will be described. The adhesive layer 16 of the thermal transfer recording medium 10 is brought into close contact with the image receiving layer 23 of the intermediate transfer medium 20, and printing is performed with a thermal head from the back coat 11 side of the thermal transfer recording medium 10, whereby the image receiving layer 23 of the intermediate transfer medium 20 is printed. Then, the back coat layer 11 and the support 12 of the thermal transfer recording medium 10 are peeled off from the release layer 13.

  3 is a cross-sectional view schematically showing a state where the thermal transfer recording medium 10 shown in FIG. 1 is thermally transferred to the intermediate transfer medium 20 shown in FIG. Here, the printing unit 30 includes the adhesive layer 16 of the thermal transfer recording medium 10 integrated by thermal melting on the image receiving layer 23 of the intermediate transfer medium 20, the transparent thin film layer 15, the image forming layer 14, and the release layer 13. The release layer 13 is positioned on the outermost surface.

  FIG. 4 is a cross-sectional view schematically showing an image forming body obtained by transferring the intermediate transfer medium shown in FIG. For example, an image pattern (not shown) such as characters and a transfer layer 42 (outermost surface) transferred from another intermediate transfer medium to the support 41 are prepared, and peeled off by thermal transfer in order to improve adhesion. An easy-adhesion layer medium (not shown) provided with an easy-adhesion layer 43 on a possible support is prepared, and the easy-adhesion layer 43 of the easy-adhesion medium is thermally transferred to the transfer layer 42 of the transfer target 40.

  Further, the printing unit 30 thermally transferred to the image receiving layer 23 of the intermediate transfer medium 20 shown in FIG. Thereafter, the support 21 of the intermediate transfer medium 20 is peeled from the release layer 22 to obtain an image forming body.

  In the image forming body according to one aspect of the present invention described above, a layer containing a phosphor that is excited by visible light and emits visible light is used as the image receiving layer 23 of the intermediate transfer medium 20 and the image formation of the thermal transfer recording medium 10. The layer 14 is configured such that the phosphorescent wavelength distribution of the phosphor of the image receiving layer 23 is green light emission, and the phosphorescent wavelength distribution of the image forming layer 14 of the thermal transfer recording medium 10 is red light emission. It becomes possible to distinguish two different types of phosphorescent wavelength distributions in these two areas, and the phosphorescent discriminating apparatus confirms red light emission in the area of the image forming layer 14 of the thermal transfer recording medium 10, and further the intermediate transfer medium By confirming green light emission in the area of the 20 image receiving layers 23, an image forming body capable of discriminating and determining authenticity can be provided.

  FIG. 5 is a block diagram showing a configuration example of the identification device 50 for explaining one embodiment of the present invention. The identification program of the present invention is a program for moving the identification device 50, and the identification device 50 includes an imaging unit 51, a control unit 52, an angle sensor 53, a display unit 54, and an illumination unit 55. The imaging unit 51 sequentially displays images until the imaging conditions are met, and indicates to the display unit 54 that output is possible when the imaging conditions are met.

  FIG. 6 is a block diagram for explaining a configuration example of the imaging unit shown in FIG. The imaging unit 51 includes an imaging device 60, an exposure control unit 61, and a focus control unit 62. The exposure control unit 61 includes a shutter speed control unit 63 and an aperture value control unit 64. A sensor 53 is provided. The imaging unit 51 is desirably provided with an illumination unit 55 as necessary. Further, the control unit 52 includes a storage unit 57 and a calculation unit 58.

  In the present application, the imaging condition means a setting condition indicating the imaging method such as the imaging condition. For example, the information represents the specifications at the time of imaging such as the shutter speed at the time of shooting, the aperture value, and the sensitivity of the image sensor (ISO sensitivity). In addition, the discriminator 59 moves so that the value of the angle sensor 53 attached to the imaging unit 51 falls within a predetermined range.

  As for the value of the angle sensor 53, it is necessary that the angle formed by the normal line of the identification device 50 and the image forming body is not 90 ° so that the light from the illumination unit 55 does not enter much. The light emitted from the phosphor-containing layer is considerably weaker than the light from the illumination unit. For this reason, the light from the illumination unit 55 is necessary to emit light, but it is necessary to avoid entering the image sensor 60 as much as possible, and the angle is limited as one condition for that purpose. Assuming that the angle formed by the normal line of the imaging device and the image forming body is θ, the angle of the imaging condition is preferably 20 ° ≦ θ ≦ 80 °.

  Moreover, the imaging conditions can include the presence or absence of illumination by the illumination unit 55 and the difference in illumination intensity as necessary. Although it is desirable to use predetermined values for the setting values of these imaging conditions, the setting may be appropriately instructed. The illumination unit 55 is preferably integrated with the imaging unit 51. However, the color and the image may be changed by changing the angle of the illumination unit 55. Therefore, it is necessary to set the angle of the illumination unit 55 in consideration of this.

  Note that the imaging unit 51 may be one that fixes the focal length at the telephoto or wide angle, or may be able to change the focal length. In this case, the focal length can be changed by the focus control unit 62 in accordance with, for example, an instruction from the control unit 52 or the like. The focus control unit 62 may be provided with an autofocus function for automatically focusing on an object, or may be provided with a manual focus function.

  The illumination unit 55 is a device that illuminates an image forming body that is an imaging target of the imaging unit 51. The illumination unit 55 performs predetermined illumination on the image forming body immediately before the imaging unit 51 captures an image in response to an instruction output by the control unit 52. The illuminating unit 55 is preferably a light emission method that irradiates strong light in a short time toward an imaging target called a flash, a strobe, etc., and is set to capture an image after an arbitrary time after the light from the illuminating unit 55 is turned off. To do. The arbitrary time is preferably between 50 microseconds and 5 milliseconds for the imaging device 60 to read phosphorescence.

  Note that the predetermined illumination performed on the imaging object by the illumination unit 55 in response to the instruction means illumination that varies the amount of light emission depending on the presence or absence of the instruction. That is, the intensity control unit 66 and the time control unit 65 of the illumination unit 55 emit a strong light for a short time or increase the illumination intensity in response to the instruction. The control unit 52 may detect the brightness from the image acquired by the imaging unit 51, or an illuminance sensor is attached to the imaging unit 51, and an indication of the intensity of the illumination is changed by the numerical value of the brightness. May be.

The identification device 50 preferably includes the imaging unit 51, the control unit 52, the angle sensor 53, the display unit 54, and the illumination unit 55, but can be configured as a separate device for each element. As an example provided integrally, a part or all of a camera, a portable camera, or the like of a portable information terminal is preferably used as the identification device 50. However, the imaging unit 51, the angle sensor 53, and The illumination unit 55 can also be configured.

FIG. 7 is a flowchart for explaining an operation example of the control unit 52 shown in FIG. 5 according to the identification program of the present invention.
With reference to FIG. 7, the operation example of the control part by the identification program of this invention is demonstrated. For example, when the identifier 59 performs a predetermined instruction operation, the operation of the control unit by the identification program of the present invention is started (step 71). The discriminator 59 follows the instruction while looking at the display unit 54, and, as shown in FIG. 7, the normal line of the discriminating apparatus 50 is set so that the region of the layer containing the phosphor of the image forming body enters the imaged range. The identification device 50 is held up so that the angle formed by the image forming body is an arbitrary angle (step 72). At this time, the angle θ formed by the normal line of the identification device 50 and the image forming body is preferably not 90 ° so that the reflected light of the illumination does not enter, and preferably 20 ° ≦ θ ≦ 80 °. Another angle is acceptable.

  The identification device 50 acquires an image (step 73), verifies whether the brightness is appropriate (step 74), and adjusts the brightness (step 75) if the brightness is out of the specified range, and acquires the image (step Return to 73). If the brightness is suitable, it is verified whether the focus is suitable (step 76). If it is out of the specified range, the focus is adjusted (step 77), and the process returns to image acquisition (step 73). Here, imaging conditions for other images may be defined and conditions may be added.

  When the focal point is within a suitable range, the value of the angle sensor 53 is acquired. Whether the angle sensor 53 is a suitable value is verified (step 79), and if it is out of the specified range, it is not suitable, and is displayed on the display unit 54 so as to be recognized by the discriminator 59 (step 80). The discriminator 59 looks at the display unit 54 and follows the instruction to correct the angle of the discriminating device 50 (step 81). It is desirable that Step 72 to Step 79, which are adjustment of the operation and adjustment of the imaging unit, or Step 73 to Step 76, which is adjustment of the image, are sequentially repeated and displayed on the display unit 54 sequentially.

  When the angle sensor 53 is a suitable value and the imaging condition is satisfied, the control unit 52 of the identification device 50 enables imaging of the imaging unit 51 (can take a shutter) and instructs the display unit 54 to perform imaging. Is displayed (step 82). The identifier 59 who has seen the display unit 54 releases the shutter (step 83), turns on the illumination unit 55 for a certain period of time (step 84), and then the imaging unit 51 issues an imaging instruction after an arbitrary time has elapsed (step 85). . The image obtained by the imaging unit 51 is recorded in RGB in the storage unit 57 of the control unit 52 as the luminance of light emission (step 86).

  When the imaging condition is satisfied, the control unit 52 causes the display unit 54 to display an imaging instruction, the identifier 59 releases the shutter, and the control unit 52 causes the imaging unit 51 to perform imaging in response to the determination of the identifier 59. However, the control unit 52 may determine to directly release the shutter and cause the imaging unit 51 to capture an image.

  The image recorded in the storage unit 57 may be displayed on the display unit 54. However, an identification range of the image (output signal) is set in advance, and whether the calculation unit 58 of the control unit 52 is within the identification range. The determination is made based on whether or not (step 87). The identification range is set in advance in consideration of variations in light emission of the layer containing the phosphor of the image forming body. If it is within the range, it is desirable to display OK on the display unit 54, and display NG on the display unit 54 if out of the range.

Using the identification method as described above, the wavelength distributions of two different phosphorescent colors in two regions are identified by using an angle sensor and an image pickup device included in a commonly used portable information terminal camera or portable camera. Therefore, it is possible to provide an image forming body capable of identifying and determining the authenticity of a personal authentication medium in which individual information such as a booklet such as a passport or a visa is recorded, and an identification method thereof.

  The authenticity of personal authentication media such as passports and visas was originally identified by the examiner at the time of immigration, so there was no problem even if the identification device was special. However, if authenticity can be determined with a camera or mobile camera of a portable information terminal that is used in general, passports and visas can be used as personal authentication media in situations other than immigration. Become.

  DESCRIPTION OF SYMBOLS 10 ... Thermal transfer recording medium, 11 ... Backcoat, 12, 21, 41 ... Support body, 13, 22 ... Release layer, 14 ... Image forming layer, 15 ... Transparent thin film layer, 16 ... Adhesive layer, 20 ... Intermediate transfer Medium 22... Release layer 23. Image receiving layer 30 Print unit 40 Transfer object 42 Transfer layer 43 Easy adhesion layer 50 Identification device 51 Imaging unit 52 Control unit 53 ... Angle sensor, 54 ... Display part, 55 ... Illumination part, 57 ... Storage part, 58 ... Calculation part, 59 ... Discriminator, 60 ... Image sensor, 61 ... Exposure control part, 62 ... Focus control part, 63 ... Shutter speed Control part 64 ... Aperture value control part 65 ... Time control part 66 ... Strength control part

Claims (6)

  An intermediate transfer medium in which at least a transferable image-receiving layer is formed on a support, and the image-forming layer is thermally transferred to the image-receiving layer from a heat-sensitive transfer recording medium on which the image-forming layer is transferably formed on the support. The surface of the image receiving layer on which the image forming layer has been thermally transferred is superimposed on the surface to be transferred of the transfer target, and the image forming layer is transferred onto the transfer target with the image receiving layer by heating and pressing. In the formed image forming body, the intermediate transfer medium or the thermal transfer recording medium is provided with a layer containing a phosphor that is excited by visible light and emits visible light.   The image forming body according to claim 1, wherein the layer containing a phosphor that is excited by visible light and emits visible light is the image receiving layer of the intermediate transfer medium.   2. The image forming body according to claim 1, wherein the layer containing a phosphor that is excited by visible light and emits visible light is the image forming layer of the thermal transfer recording medium.   The layer containing a phosphor that is excited by visible light and emits visible light is the image receiving layer of the intermediate transfer medium and the image forming layer of the thermal transfer recording medium, and the phosphor of the image receiving layer The image forming body according to any one of claims 1 to 3, wherein the phosphorescent wavelength distribution is different from the phosphorescent wavelength distribution of the image forming layer of the thermal transfer recording medium. An imaging unit, an angle sensor for measuring an angle of the imaging unit for providing an imaging condition, an illumination unit that emits visible light that excites the phosphor, a display unit, and a control unit that controls each of the units A program for causing the control unit of the apparatus to include control for determining whether the image forming body is true or false according to any one of claims 1 to 4,
Irradiating the illumination unit with the visible light when the imaging unit satisfies an imaging condition, and instructing the imaging unit to image the image forming unit after a predetermined time from the irradiation. Generating an imaging instruction to be performed, and determining whether the image forming body is authentic or not based on whether or not the emission of the phosphor is identified from the captured image of the image forming body, and displaying the determination result on the display unit And causing the control unit to execute an identifying step.   Determining whether the image forming body is true or false based on whether or not two different phosphorescent wavelength distributions are identified from the captured image of the image forming body, and displaying the determination result on the display unit; The identification program according to claim 5, wherein the identification program is executed by the control unit.