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WO2018159413A1 - Corps de guide de lumière et article de prévention de contrefaçon - Google Patents

Corps de guide de lumière et article de prévention de contrefaçon Download PDF

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Publication number
WO2018159413A1
WO2018159413A1 PCT/JP2018/006217 JP2018006217W WO2018159413A1 WO 2018159413 A1 WO2018159413 A1 WO 2018159413A1 JP 2018006217 W JP2018006217 W JP 2018006217W WO 2018159413 A1 WO2018159413 A1 WO 2018159413A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
light
grating region
incident
grating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/006217
Other languages
English (en)
Japanese (ja)
Inventor
祐子 青山
佐藤　潤
健太 杉江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP2019502911A priority Critical patent/JP7095678B2/ja
Publication of WO2018159413A1 publication Critical patent/WO2018159413A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/124—Geodesic lenses or integrated gratings

Definitions

  • the present invention relates to a light guide and an anti-counterfeit article that can be used for authenticity determination, for example.
  • Patent Document 1 a security document including an optical waveguide (light guide unit) has been disclosed (for example, Patent Document 1).
  • a light guide provided with such a light guide part for authenticity determination or the like, further improvement in security has been desired, and improvement in convenience in authenticity determination has been desired.
  • An object of the present invention is to provide a light guide and an anti-counterfeit article that have improved security and convenience.
  • the first invention includes a light guide portion (10a) that guides light by repeatedly reflecting inside, and a first grating region that deflects light incident at a specific incident angle toward the light guide portion (10a). (13, 23) and a second grating region (14, 24) for deflecting light incident at an incident angle within a predetermined allowable range on the basis of the specific incident angle toward the light guide unit (10a). ), An incident part (15, 25) for making light incident on the light guide part (10a) in a predetermined traveling direction, and light emitted from the incident part (15, 25) and the light guide part (10a).
  • the light guide (10, 20) includes an emission part (18, 28) from which light guided by the light is emitted.
  • the second grating region (14, 24) includes the same grating as the first grating region (13, 23). There is no light guide (10, 20).
  • the first grating region (13, 23) and the second grating region (14, 24) are The light guides (10, 20) are characterized in that they are arranged at least adjacent to each other.
  • the emission portion (18, 28) includes the first grating region (13, 23) a third grating region (16, 26) for emitting the light that is incident from 23) and guided by the light guide unit (10a) at an emission angle equal to the specific incident angle; and the second grating region (14) , 24) and a fourth grating region (17, 27) for emitting the light guided by the light guide (10a), and a light guide (10, 20) characterized in that is there.
  • the fifth invention is: In the light guide (10, 20) according to the fourth invention, the third grating region (16, 26) and the fourth grating region (17, 27) are disposed at least adjacent to each other, It is a light guide (10, 20) characterized by these.
  • a sixth invention is the light guide (10, 20) according to the fourth invention or the fifth invention, wherein the third grating region (16, 26) and the fourth grating region (17, 27) At least one is a light guide (10, 20) characterized by being arranged to represent at least one of a character, a figure, and a symbol.
  • the first grating region (13, 23) and the second grating region (14). , 24) are light guides (10, 20) characterized in that gratings corresponding to the same wavelength are arranged.
  • An eighth invention is the light guide (10, 20) according to any one of the first invention to the sixth invention, wherein the first grating region (13, 23) and the second grating region. (14, 24) is a light guide (10, 20) characterized in that the corresponding wavelengths are different.
  • the ninth invention is an anti-counterfeit article comprising the light guide according to any one of the first to eighth inventions.
  • the light guide and the anti-counterfeit article are improved in security and convenience.
  • FIG. 2 is a cross-sectional view of a light guide 10 cut at a position indicated by an arrow AA in FIG. It is the figure which expanded the incident part 15 from the surface side.
  • FIG. 3 is an enlarged cross-sectional view of a first grating region 13 in FIG. 2.
  • FIG. 3 is an enlarged cross-sectional view of a second grating region 14 in FIG. 2.
  • It is a figure which shows the state of the determination in simple determination.
  • FIG. 1 is a diagram showing a first embodiment of a light guide 10 according to the present invention.
  • FIG. 2 is a cross-sectional view of the light guide 10 cut at the position of the arrow AA in FIG.
  • FIG. 1 and FIG. 2 is a diagram schematically shown, and the size and shape of each part are appropriately exaggerated for easy understanding.
  • specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
  • terms that specify shape and geometric conditions for example, terms such as parallel and orthogonal, are strictly meanings, have similar optical functions, and can be regarded as parallel and orthogonal. It also includes a state having an error.
  • the sheet surface refers to a surface that is a planar direction of the sheet when viewed as the entire sheet.
  • transparent refers to a material that transmits at least light having a wavelength to be used. For example, even if it does not transmit visible light, as long as it transmits infrared light, it is handled as transparent when used for infrared applications.
  • the surface of the light guide 10 shown in FIG. 1 (upper surface in FIG. 2) is referred to as the front surface, and the back side of FIG. 1 (lower surface in FIG. 2) is referred to as the back surface for convenience.
  • the configuration of the light guide 10 is not limited by the orientation of the.
  • the light guide 10 has a sheet shape, a film shape, or a plate shape in which a base material layer 11 and a shaping layer 12 are laminated.
  • the light guide body 10 of the present embodiment is, for example, one configuration of an anti-counterfeit article by being embedded so as to be embedded in a bill or a plastic bill as an attached object, or a passport (hereinafter referred to as an anti-counterfeit article). Can be used as an element.
  • the base material layer 11 is a layer arranged mainly for use as a base when the light guide 10 is manufactured.
  • the shaping layer 12 is laminated on the surface side of the base material layer 11.
  • the shaping layer 12 includes an incident portion 15 and an emission portion 18 on the surface thereof.
  • the base material layer 11 and the shaping layer 12 have a light guide part (core) 10a for guiding the light used for authenticity determination (hereinafter referred to as determination light) incident from the incident part 15 toward the emission part 18 side.
  • determination light the base material layer 11 and the shaping layer 12 are made of materials having substantially the same refractive index with respect to the determination light.
  • region between the incident part 15 and the output part 18 is an area
  • This light guide part 10a guides light by repeating reflection inside.
  • a material which comprises the base material layer 11 PET, a polycarbonate, acrylic resin etc. are mentioned, for example.
  • a material which comprises the shaping layer 12 ultraviolet curable resin materials, such as acrylic type ultraviolet curable resin, etc. are mentioned, for example. Both the material constituting the base material layer 11 and the material constituting the shaping layer 12 are at least transparent to determination light.
  • the base material layer 11 and the shaping layer 12 constitute a core (light guide portion 10a) as the light guide 10, and the air (atmosphere) positioned around the core constitutes a cladding.
  • Light can be guided using the material layer 11 and the shaping layer 12 as the light guide portion 10a. Therefore, as the material constituting the base material layer 11 and the shaping layer 12, a material having a refractive index larger than that of air (atmosphere) constituting the cladding is used. Thereby, light can be efficiently guided while being reflected at the interface between the core constituted by the base material layer 11 and the shaping layer 12 and the clad constituted by air (atmosphere).
  • the thickness T1 of the base material layer 11 and the thickness T2 of the shaping layer 12 are determined by coupling the determination light to the light guide portion 10a after the determination light incident from the incident portion 4 is deflected toward the light guide portion 10a (light Can be deflected in a light guideable direction and incident on the light guide unit 10a as appropriate), and the determination light guided by the light guide unit 10a is emitted from the emission unit 18.
  • the thickness is not particularly limited as long as the thickness can be reduced.
  • the thickness T1 of the base material layer 11 can be set to about 1 to 1000 ⁇ m
  • the thickness T2 of the shaping layer 12 can be set to about 1 to 500 ⁇ m.
  • the length L in the longitudinal direction and the width W in the short direction of the light guide 10 are articles (for example, anti-counterfeit articles) to which the light guide 10 according to this embodiment is attached.
  • articles for example, anti-counterfeit articles
  • the length L in the longitudinal direction of the light guide 10 is usually about 10 to 90 mm.
  • the width W in the direction is about 1 to 10 mm.
  • FIG. 3 is an enlarged view of the incident portion 15 from the surface side.
  • the incident portion 15 includes a first grating region 13 and a second grating region 14, and makes light incident on the light guide portion 10a in a predetermined traveling direction.
  • region 13 is an area
  • the incident angle refers to an angle formed by a normal line to the sheet surface of the light guide 10 (the base material layer 11 and the shaping layer 12) and incident light.
  • FIG. 4 is an enlarged cross-sectional view of the first grating region 13 in FIG.
  • the first grating region 13 is configured by a diffraction grating in which minute uneven shapes are continuously arranged in a cross section.
  • diffraction gratings arranged concentrically as shown in FIG. 3 are provided.
  • the diffraction grating of the first grating region 13 has a shape in which a large number of unit shapes 13a are arranged at equal intervals of the pitch P13 in the cross-sectional shape shown in FIG.
  • the diffraction grating of the first grating region 13 deflects and guides only the light incident from the direction orthogonal to the incident portion 15 of the light guide 10 toward the light guide portion 10a. It is a diffraction grating that makes it possible. Therefore, the specific incident angle described above is 0 degree (normal incidence) in the case of the present embodiment.
  • the second grating region 14 deflects light incident at an incident angle within a predetermined allowable range with reference to a specific incident angle (0 degree) in the first grating region 13 toward the light guide unit 10a.
  • the first grating region 13 is arranged around the first grating region 13 except for the first grating region 13.
  • FIG. 5 is an enlarged cross-sectional view of the second grating region 14 in FIG.
  • the second grating region 14 is configured by a diffraction grating in which minute uneven shapes are continuously arranged in a cross section.
  • the second grating region 14 of the present embodiment is provided with diffraction gratings arranged concentrically as shown in FIG.
  • the arrangement pitch of the shape is lined up gradually.
  • the center pitch P14 is an average value of the minimum pitch P14min and the maximum pitch P14max. Since the second grating region 14 is configured as an aggregate region of unit shapes having different pitches in this way, the incident angle of the determination light irradiated to the incident portion 15 (the angle with respect to the normal line on the surface (sheet surface) of the shaping layer 12) ) Can be provided with a predetermined tolerance.
  • the emitting unit 18 includes a third grating region 16 and a fourth grating region 17, and emits determination light incident on the incident unit 15 and guided by the light guide unit 10 a.
  • the third grating region 16 emits the determination light incident from the first grating region 13 and guided by the light guide unit 10a at an emission angle equal to the specific incident angle (0 degree) corresponding to the first grating region 13.
  • the third grating region 16 is configured by a diffraction grating in which unit shapes having the same shape as the first grating region 13 are arranged side by side.
  • the third grating region 16 can emit only the determination light incident on the incident portion 15 at a specific incident angle (0 degree) and guided by the light guide portion 10a.
  • the third grating region 16 is arranged in a shape (range) representing a character string “OK” in the emitting unit 18.
  • region 16 represents is not restricted to a character, A figure and a symbol may be sufficient. Further, characters or the like may be represented in the fourth grating region 17.
  • the fourth grating region 17 emits light incident from the second grating region 14 and guided by the light guide unit 10 a at an angle equal to the incident angle incident on the second grating region 14. That is, the fourth grating region is configured by a diffraction grating in which unit shapes having the same shape as the second grating region 14 are arranged side by side. Therefore, the fourth grating region 17 can emit determination light reaching from the light guide unit 10a at an angle within a predetermined allowable range by a diffraction grating configured by unit shapes sequentially arranged at a plurality of pitches.
  • the fourth grating region 17 is arranged in the emitting portion 18 so as to surround the third grating region 16 and have an outer shape that is a shape (range) in which a cross character is crushed as shown in FIG.
  • the light guide 10 described above can be manufactured as follows. First, an ultraviolet curable resin material such as an acrylic ultraviolet curable resin, which constitutes the shaping layer 12 on one surface side of the base material layer 11 while feeding the base material layer 11 wound in a roll shape. Is applied to form a resin layer.
  • an ultraviolet curable resin material such as an acrylic ultraviolet curable resin
  • the fourth grating region 17 is formed from the first grating region 13 made of a concavo-convex pattern (diffraction grating) in the incident portion 15 and the emitting portion 18.
  • the light guide of this embodiment can be manufactured.
  • the incident portion 15 is formed by combining the first grating region 13 and the second grating region 14, and the third grating region 16 and the fourth grating region 17 are further provided.
  • a combined emission portion 18 was obtained.
  • the light guide 10 of this embodiment can perform the authenticity determination of a several different form with the irradiation form of the light to the incident part 15. FIG. This will be described below.
  • a simple method in which light is incident while holding a light source such as a laser light source or an LED light when determining light is incident on the incident portion 15 in order to perform authenticity determination.
  • a light source such as a laser light source or an LED light when determining light is incident on the incident portion 15 in order to perform authenticity determination.
  • Both methods of irradiating light from a specific direction using a determination-dedicated device (machine) (hereinafter referred to as machine determination) can be used in the light guide 10 of the present embodiment.
  • the determination using the second grating region 14 and the fourth grating region 17 is mainly performed.
  • FIG. 6 is a diagram illustrating a determination state in the simple determination.
  • the first state is a state in which the determination light is incident within a certain incident angle range including a specific angle (0 degree).
  • both the third grating region 16 and the fourth grating region 17 are shined and observed. Since both the third grating region 16 and the fourth grating region 17 shine, the two cannot be distinguished from each other.
  • This first state is a state that can be observed only under extremely limited conditions.
  • the second state is a state in which the determination light is incident at an incident angle that does not include a specific angle (0 degree).
  • the third grating region 16 is not illuminated, and only the fourth grating region 17 is illuminated and observed. Therefore, by simple determination, at least the fourth grating region 17 can be observed with light, and thereby simple authentication can be determined.
  • FIG. 7 is a diagram illustrating a determination state in machine determination.
  • the light guide 10 is installed on the installation base Bm of the determination apparatus, and a light source Sm that accurately irradiates determination light from a specific angle (0 degree) direction is prepared. Therefore, in the machine determination, as indicated by reference numeral 18C in FIG. 7, only the third grating region 16 is observed as being illuminated, and the fourth grating region 17 is not illuminated. Therefore, more accurate authentication can be determined by machine determination.
  • the incident angle of the determination light performed in the machine determination is a specific angle and is a pinpoint angle direction.
  • the specific angle is set to an easy-to-understand angle of 0 degrees.
  • this is set to an unintelligible angle, for example, 18 degrees or 42 degrees, the incident angle for determination is determined. This is because it would be difficult for a malicious person to find that particular angle.
  • the light guide body of the present embodiment is attached to or embedded in, for example, a bill or a plastic bill as an attachment, or a passport (hereinafter, forgery prevention article). By being attached, it can be used as a component of an anti-counterfeit article.
  • an anti-counterfeit article will be exemplified.
  • FIG. 9 is a diagram illustrating an example of a banknote 100 as an anti-counterfeit article including the light guide 10.
  • the light guide 10 can be used by being attached to a part of the banknote 100, for example.
  • the light guide 10 is arranged such that the incident part 15 and the emission part 18 are arranged in the vertical direction of the banknote 100, but this direction may be a horizontal direction.
  • the light guide 10 showed the example which has reached to the upper end and lower end of the banknote 100, the one end or both ends of the light guide 10 may be arrange
  • the example of the banknote 100 was illustrated, it is applicable with the same form also to money vouchers, tickets, etc., such as a gift certificate and a lottery ticket.
  • FIG. 10 is a diagram illustrating an example of a data page 200 as an anti-counterfeit article including the light guide 10.
  • the light guide 10 can be used by being attached to a part of the data page 200, for example.
  • the data page 200 shown in FIG. 10 may be bound and used as a booklet such as a passport via a hinge, or may be provided with a non-contact communication IC chip, a loop antenna, etc. (not shown).
  • the light guide 10 is not limited to a configuration in which the light guide 10 is pasted on the data page 200, and may be configured to be partially or entirely embedded in the data page 200, for example.
  • the anti-counterfeit article including the light guide body 10 of the first embodiment is illustrated, but the light guide body 20 of the second embodiment can be similarly configured.
  • the light guide body 10 of the present embodiment is the incident portion 15 that combines the first grating region 13 and the second grating region 14, and further, the third grating region 16. And the fourth grating region 17 are used as the emitting portion 18.
  • the light guide 10 can be adapted to both simple determination and machine determination. Therefore, since the light guide 10 of the present embodiment can use different authentication methods, security is improved and convenience is also improved.
  • FIG. 8 is a diagram illustrating the light guide 20 according to the second embodiment.
  • the light guide 20 of the second embodiment is the same as that of the first embodiment, except that the arrangement and shape of the incident portion 25 and the emission portion 28 are different from those of the first embodiment. Therefore, parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted as appropriate.
  • the first grating region 23 and the second grating region 24 are configured in a rectangular shape having the same size, and the first grating region 23 and the second grating region 24 are arranged side by side. ing.
  • the third grating region 26 and the fourth grating region 27 are configured in a rectangular shape having the same size, and the third grating region 26, the fourth grating region 27, Are arranged side by side.
  • manufacture of the incidence portion 15 and the emission portion 18 more specifically, a mold (imprint mold) corresponding to the incidence portion 15 and the emission portion 18.
  • a mold imprint mold
  • the second grating regions 14 and 24 have been described by taking a form including a diffraction grating portion having the same arrangement pitch as that of the first grating regions 13 and 23.
  • the second grating regions 14 and 24 may not include a diffraction grating portion having the same arrangement pitch as that of the first grating regions 13 and 23.
  • an incident angle can be made completely different by simple determination and machine determination.
  • first grating regions 13 and 23 and the second grating regions 14 and 24 have been described by giving an example in which they are collectively arranged.
  • first grating regions 13 and 23 and the second grating regions 14 and 24 may be arranged at different positions apart from each other. The same applies to the relationship between the third grating regions 16 and 26 and the fourth grating regions 17 and 27.
  • the determination light for simple determination and the determination light for machine determination have been described with an example in which light of the same color, that is, the wavelength ⁇ of the determination light is 532 nm.
  • the color may be changed between determination light for simple determination and determination light for machine determination.
  • the wavelength of the determination light for simple determination may be 300 nm
  • the wavelength of the determination light for machine determination may be 500 nm.
  • each diffraction grating may be set so as to correspond to each wavelength.
  • the third grating regions 16 and 26 and the fourth grating regions 17 and 27 are arranged in the emitting portions 18 and 28.
  • the incident parts 15 and 25 and the emission parts 18 and 28 have been described with examples arranged on the same surface of the light guide 10.
  • the incident portions 15 and 25 may be disposed on the front surface
  • the emission portions 18 and 28 may be disposed on the rear surface.
  • the example which the light guide part 10a was comprised by the base material layer 11 and the shaping layer 12 was demonstrated and demonstrated.
  • the light guide 10 may not include the base material layer 11, and the light guide unit 10 a may be configured only by the shaping layer 12.
  • corrugated shape which comprises the diffraction grating of the incident parts 15 and 25 and the output parts 18 and 28 demonstrated and demonstrated the example which is a rectangular shape.
  • the concavo-convex shape constituting the diffraction grating may be a so-called blazed diffraction grating having a saw blade shape or a multistage diffraction grating, and any form of diffraction grating. May be.
  • the determination light irradiated to the incident part 15 was demonstrated taking the visible laser beam of wavelength 532nm as an example.
  • invisible light wavelength 360 nm or less, 830 nm or more
  • the pitch of the diffraction grating may be adjusted as appropriate according to the wavelength, and the light guide 10 and the forgery prevention to which the light guide 10 is attached using a sensor or the like that can detect the diffracted light emitted from the emission unit 18. What is necessary is just to perform infringement determination of goods.
  • each diffraction grating is configured on the basis of light that is perpendicular to the light guide 10, that is, incident from a direction with an incident angle of 0 degrees.
  • the incident angle may be any angle.
  • corrugated shape which comprises the diffraction grating of the incident parts 15 and 25 and the output parts 18 and 28 gives the example manufactured using the imprint mold which has an uneven
  • a negative photoresist layer or a positive resist layer may be formed on one surface side of the base material layer 11, and an uneven shape of the diffraction grating may be formed by exposure and development processing on the resist layer.
  • the concave and convex shape of the diffraction grating may be formed by pattern etching using an etching mask on the resin layer formed on the one surface side of the base material layer 11.
  • the concave / convex shape of the diffraction grating is formed by applying hot embossing to the resin layer formed on one side of the base material layer 11 using a stamper having a concave / convex pattern corresponding to the concave / convex shape of the diffraction grating. May be.
  • the light guides 10 and 20 have been described using examples for authenticity determination.
  • the present invention is not limited to this.
  • it may be used for other purposes such as a toy or an advertising medium by using a change in appearance in the emission units 18 and 28.
  • a high refractive index layer formed of a material having a refractive index larger than the refractive index of the shaping layer 12 may be further provided on the shaping layer 12.
  • a transparent material provided with a larger refractive index than the shaping layer 12 can be used for such a high refractive index layer.
  • metals such as Mg, Ti, Cr, Fe, Co, Ni, Cu, Zn, Ga, Ge, Se, Rb, Pd, Ag, Cd, In, Sn, Sb, Te, Au, Pb, Bi, etc.
  • the high refractive index layer may have a laminated structure including a plurality of layers formed using two or more materials from the above materials.
  • the thickness of such a high refractive index layer can be set in the range of 1 to 300 nm, for example.
  • the light guides 10 and 20 of each embodiment may be further laminated with layers having other functions.
  • an adhesive layer for attaching the light guides 10 and 20 to other anti-counterfeit articles may be laminated on the front or back surface of the light guides 10 and 20.
  • the adhesive layer may be appropriately selected according to the anti-counterfeit article to be attached, such as a heat seal adhesive, a pressure sensitive adhesive, and an adhesive adhesive.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Planar Illumination Modules (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention porte sur un corps de guide de lumière et sur un article de prévention de contrefaçon dans lesquels la sécurité et la commodité sont améliorées. Le corps de guide de lumière (10) comprend : une unité de guide de lumière (10a) qui guide la lumière par réflexion répétée de la lumière à l'intérieur de cette dernière ; une première zone de gradation (13) qui dévie la lumière incidente à un angle d'incidence spécifique vers l'unité de guide de lumière (10a) ; une seconde zone de gradation (14) qui dévie, vers l'unité de guide de lumière (10a), la lumière incidente à un angle d'incidence dans une plage admissible prédéterminée ayant l'angle d'incidence spécifique comme référence, le corps de guide de lumière (10) comprenant en outre une partie incidente (15) qui amène la lumière à être incidente sur l'unité de guide de lumière (10a) dans une direction de progression prescrite, et une partie de sortie (18) à l'aide de laquelle la lumière émise par la partie incidente (15) et guidée par l'unité de guide de lumière (10a) est sortie.
PCT/JP2018/006217 2017-03-03 2018-02-21 Corps de guide de lumière et article de prévention de contrefaçon Ceased WO2018159413A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019502911A JP7095678B2 (ja) 2017-03-03 2018-02-21 導光体、偽造防止物品

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JP2017-040913 2017-03-03
JP2017040913 2017-03-03

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WO2018159413A1 true WO2018159413A1 (fr) 2018-09-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220371355A1 (en) * 2020-01-27 2022-11-24 Orell Füssli AG Document of identification with optical lightguide
US11827046B2 (en) 2020-01-27 2023-11-28 Orell Füssli AG Security document with lightguide having a sparse outcoupler structure
WO2025056167A1 (fr) * 2023-09-14 2025-03-20 Orell Füssli AG Élément optique de protection à base de guide de lumière pour documents de sécurité et document de sécurité

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2002019338A (ja) * 2000-07-11 2002-01-23 Nippon Telegr & Teleph Corp <Ntt> 導波路ホログラム型偽造防止シールとそれを備えた物品及びそれを用いた認証方法

Family Cites Families (1)

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Publication number Priority date Publication date Assignee Title
US6805490B2 (en) * 2002-09-30 2004-10-19 Nokia Corporation Method and system for beam expansion in a display device

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2002019338A (ja) * 2000-07-11 2002-01-23 Nippon Telegr & Teleph Corp <Ntt> 導波路ホログラム型偽造防止シールとそれを備えた物品及びそれを用いた認証方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220371355A1 (en) * 2020-01-27 2022-11-24 Orell Füssli AG Document of identification with optical lightguide
US11827046B2 (en) 2020-01-27 2023-11-28 Orell Füssli AG Security document with lightguide having a sparse outcoupler structure
WO2025056167A1 (fr) * 2023-09-14 2025-03-20 Orell Füssli AG Élément optique de protection à base de guide de lumière pour documents de sécurité et document de sécurité

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