WO2017000048A1 - Optical variable element - Google Patents

Optical variable element Download PDF

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Publication number
WO2017000048A1
WO2017000048A1 PCT/BG2015/000019 BG2015000019W WO2017000048A1 WO 2017000048 A1 WO2017000048 A1 WO 2017000048A1 BG 2015000019 W BG2015000019 W BG 2015000019W WO 2017000048 A1 WO2017000048 A1 WO 2017000048A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
layer
variable
pyramids
configuration
Prior art date
Application number
PCT/BG2015/000019
Other languages
French (fr)
Inventor
Valentin Konstantinov MONOVSKI
Georgi Ivanov STOILOV
Mario Rumenov DOBREV
Andrii Ivanovskyi
Inhat POHAN
Angel Georgiev BALDZHIEV
Evgeniy Anastasov LASKOV
Dimitar Antonov TONCHEV
Ivo Rumenov DELCHEV
Original Assignee
Demax - Holograms Ad
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 Demax - Holograms Ad filed Critical Demax - Holograms Ad
Priority to PCT/BG2015/000019 priority Critical patent/WO2017000048A1/en
Priority to PCT/EP2016/065049 priority patent/WO2017001424A1/en
Publication of WO2017000048A1 publication Critical patent/WO2017000048A1/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0252—Diffusing elements; Afocal elements characterised by the diffusing properties using holographic or diffractive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1861—Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials

Definitions

  • the invention relates to an optical variable element of visible black colour and it will be applicable as a security feature for the authenticity of documents, banknotes, trademarks, etc. by applying the optical element on the protected object.
  • An optical variable element which comprises a black- white diffraction and interference light filter, which consists of mutually perpendicular sinusoidal diffraction patterns.
  • the said optical element ensures a high contrast between black colour and white colour.
  • a disadvantage of the mentioned optical element is the impossibility to be distributed as a mass product by means of stamping.
  • the aim of the present invention is to create a variable optical element, which contains an image of visible black colour and which can be easily distributed by means of stamping and can be easily built into documents, banknotes, packages etc. of serial production, using a conventional equipment.
  • variable optical element of visible black colour containing a transparent diffraction layer, which consists of at least two superposed in different directions (angular shifted) diffraction patterns.
  • the variable optical element also includes an optical transformation layer, while the diffraction layer configuration consists of two-dimensional shaped pyramids with a raster distance, where the pyramids are placed on, within the scope of 0,2 - 0,4 um.
  • the diffraction layer configuration of the optical variable element consists of regular tetragonal pyramids.
  • the diffraction layer configuration of the optical variable element consists of pyramids with an unspecified number of angles, including cones.
  • the diffraction layer configuration of the optical variable element consists of periodically arranged and/or chaotically scattered areas, which areas include periodically arranged and/or chaotically scattered pyramids.
  • the diffraction layer configuration of the optical variable element consists of upright and/or inclined pyramids.
  • the optical transformation layer of the optical variable element is transparent, while the configuration depth d of the diffraction layer is within the scope of 0,2 ⁇ - 1 ⁇ .
  • the optical transformation layer of the optical variable element is reflective, or has a reflective coating, while the configuration depth d of the diffraction layer is within the scope of 0,1 ⁇ - 0,5 ⁇ .
  • the optical transformation layer of the optical variable element is the environmental medium, including air or vacuum.
  • optical variable element The advantages of the disclosed optical variable element are expressed by its technological advance and the possibility of distribution by means of a conventional technological line.
  • Figure 1 represents a schematic illustration of the layers, forming the optical variable element
  • Figure 2 depicts a diffraction layer configuration of the optical variable element, consisting of regular tetragonal pyramids
  • Figure 3 shows a diffraction layer configuration of the optical variable element, consisting of various combinations of uniform, periodically arranged and different, chaotically scattered pyramids.
  • the optical variable element comprises a support 1 of polyethylene terephthalate (PET), where a wax separation layer 2, one or multiple transparent protection layer(s) 3 and an anti-reflection coating 4 are consecutively applied on.
  • a diffraction layer 5 is formed on the anti- reflection coating 4 and directly contacts one transformation layer 6.
  • An adhesive layer 7, coated by a removable protective silicone paper sheet 8, is applied on the transformation layer 6.
  • the optical transformation layer 6 can be transparent, for instance made of polymer, as well as reflective.
  • the optical variable element In case the optical transformation layer 6 is transparent, the optical variable element operates in a passage mode, and if the optical transformation layer 6 is reflective, the optical variable element operates in a reflection mode.
  • the diffraction layer 5 configuration consists of two-dimensional shaped pyramids 9. The best results are achieved with a raster distance n, where the pyramids 9 are placed on, within the scope of 0,2 - 0,4 ⁇ .
  • the diffraction layer 5 configuration of the optical variable element can comprise regular tetragonal pyramids (Fig. 2), or pyramids with an unspecified number of angles, including cones, as well as periodically arranged and/or chaotically scattered areas, which areas consist of various combinations of uniform, periodically arranged and different, chaotically scattered pyramids (Fig. 3).
  • the diffraction layer 5 and the transformation layer 6 are selected in such a way, that the absolute value of the difference between the index of refraction of light nj by the diffraction layer 5 and the index of refraction of light n 2 by the transformation layer 6 is bigger than 0,5.
  • the configuration depth d of the diffraction layer 5 is within the scope of 0,2 ⁇ - 1,0 ⁇ .
  • the configuration depth d of the diffraction layer 5 is within the scope of 0, 1 um - 0,5 ⁇ .
  • the optical transformation layer 6 of the optical variable element is the environmental medium, including air or vacuum.
  • a description of the diffraction layer configuration is generated mathematically, while a file, specific for an e-beam lithography (EBL) setup processing, is created. After exposing a plate (a silicon or a glass support, dimensioned as specified by the EBL setup producer, coated with resist) to energy portions, allocated on the plate area, described in this file, a development in the relevant solution is performed according to a technique, prescribed by the resist plate producer.
  • EBL e-beam lithography
  • the configuration is copied electrochemically from the resist plate on a nickel (metal) matrix.
  • the configuration of the nickel matrix is stamped on the diffraction layer 5. Thereafter the transformation layer 6 is formed. The application of the adhesive layer 7 follows. The obtained structure is ready for sticking on different secured objects.
  • the areas including the optical variable element deflect light near to the sticker surface and for the monitor they look black.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Business, Economics & Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Filters (AREA)

Abstract

(57) The invention relates to an optical variable element of visible black colour and it will be applicable as a security feature to certify the authenticity and the uniqueness of documents, banknotes and trademarks by applying on a sticker, or directly on the surface of the protected object. The proposed variable optical element of visible black colour contains a transparent diffraction layer, consisting of at least two superposed in different directions (angular shifted) diffraction patterns, and according to the invention it also includes an optical transformation layer (6), while the diffraction layer (5) configuration consists of two-dimensional shaped pyramids (9) with a raster distance (r), where the pyramids are placed on, within the scope of 0,2 um - 0,45 μm.

Description

OPTICAL VARIABLE ELEMENT
FIELD OF THE INVENTION
The invention relates to an optical variable element of visible black colour and it will be applicable as a security feature for the authenticity of documents, banknotes, trademarks, etc. by applying the optical element on the protected object.
BACKGROUND OF THE INVENTION
An optical variable element is known, which comprises a black- white diffraction and interference light filter, which consists of mutually perpendicular sinusoidal diffraction patterns. The said optical element ensures a high contrast between black colour and white colour.
A disadvantage of the mentioned optical element is the impossibility to be distributed as a mass product by means of stamping.
Ill
DISCLOSURE OF THE INVENTION
The aim of the present invention is to create a variable optical element, which contains an image of visible black colour and which can be easily distributed by means of stamping and can be easily built into documents, banknotes, packages etc. of serial production, using a conventional equipment.
The task is solved by the proposed variable optical element of visible black colour, containing a transparent diffraction layer, which consists of at least two superposed in different directions (angular shifted) diffraction patterns. According to the invention, the variable optical element also includes an optical transformation layer, while the diffraction layer configuration consists of two-dimensional shaped pyramids with a raster distance, where the pyramids are placed on, within the scope of 0,2 - 0,4 um.
According to one embodiment of the present invention the diffraction layer configuration of the optical variable element consists of regular tetragonal pyramids. In accordance with another embodiment of the invention the diffraction layer configuration of the optical variable element consists of pyramids with an unspecified number of angles, including cones.
According to a further embodiment of the invention the diffraction layer configuration of the optical variable element consists of periodically arranged and/or chaotically scattered areas, which areas include periodically arranged and/or chaotically scattered pyramids.
In accordance with another embodiment of the invention the diffraction layer configuration of the optical variable element consists of upright and/or inclined pyramids.
Pursuant to one embodiment of the invention the optical transformation layer of the optical variable element is transparent, while the configuration depth d of the diffraction layer is within the scope of 0,2 μιη - 1 μιη.
According to another embodiment of the invention the optical transformation layer of the optical variable element is reflective, or has a reflective coating, while the configuration depth d of the diffraction layer is within the scope of 0,1 μπι - 0,5 μιτι.
In accordance with a further embodiment of the invention the optical transformation layer of the optical variable element is the environmental medium, including air or vacuum.
The advantages of the disclosed optical variable element are expressed by its technological advance and the possibility of distribution by means of a conventional technological line.
EXPLANATION OF THE ATTACHED FIGURES
An exemplary embodiment of the present invention is shown in the attached figures, explaining it, but not limited to, where:
Figure 1 represents a schematic illustration of the layers, forming the optical variable element;
Figure 2 depicts a diffraction layer configuration of the optical variable element, consisting of regular tetragonal pyramids; Figure 3 shows a diffraction layer configuration of the optical variable element, consisting of various combinations of uniform, periodically arranged and different, chaotically scattered pyramids.
EXEMPLARY EMBODIMENT OF THE INVENTION
According to the exemplary embodiment, as shown in Figure 1, the optical variable element comprises a support 1 of polyethylene terephthalate (PET), where a wax separation layer 2, one or multiple transparent protection layer(s) 3 and an anti-reflection coating 4 are consecutively applied on. A diffraction layer 5 is formed on the anti- reflection coating 4 and directly contacts one transformation layer 6. An adhesive layer 7, coated by a removable protective silicone paper sheet 8, is applied on the transformation layer 6.
In accordance with the invention the optical transformation layer 6 can be transparent, for instance made of polymer, as well as reflective.
In case the optical transformation layer 6 is transparent, the optical variable element operates in a passage mode, and if the optical transformation layer 6 is reflective, the optical variable element operates in a reflection mode.
The diffraction layer 5 configuration consists of two-dimensional shaped pyramids 9. The best results are achieved with a raster distance n, where the pyramids 9 are placed on, within the scope of 0,2 - 0,4 μιη.
Pursuant to the invention the diffraction layer 5 configuration of the optical variable element can comprise regular tetragonal pyramids (Fig. 2), or pyramids with an unspecified number of angles, including cones, as well as periodically arranged and/or chaotically scattered areas, which areas consist of various combinations of uniform, periodically arranged and different, chaotically scattered pyramids (Fig. 3).
The diffraction layer 5 and the transformation layer 6 are selected in such a way, that the absolute value of the difference between the index of refraction of light nj by the diffraction layer 5 and the index of refraction of light n2by the transformation layer 6 is bigger than 0,5.
The best effect is achieved with a configuration depth d of the transformation layer 6 approximately: d = / n2 in a reflection mode; and
d -= 2λ i - fi2 in a passage mode; where . is the selected light wavelength.
In case the optical transformation layer 6 of the optical variable element is transparent, the configuration depth d of the diffraction layer 5 is within the scope of 0,2 μπι - 1,0 μιη.
If the optical transformation layer 6 of the optical variable element is reflective, the configuration depth d of the diffraction layer 5 is within the scope of 0, 1 um - 0,5 μηι.
It is possible that the optical transformation layer 6 of the optical variable element is the environmental medium, including air or vacuum.
PREPARATION AND APPLICATION
A description of the diffraction layer configuration is generated mathematically, while a file, specific for an e-beam lithography (EBL) setup processing, is created. After exposing a plate (a silicon or a glass support, dimensioned as specified by the EBL setup producer, coated with resist) to energy portions, allocated on the plate area, described in this file, a development in the relevant solution is performed according to a technique, prescribed by the resist plate producer.
The configuration is copied electrochemically from the resist plate on a nickel (metal) matrix.
The configuration of the nickel matrix is stamped on the diffraction layer 5. Thereafter the transformation layer 6 is formed. The application of the adhesive layer 7 follows. The obtained structure is ready for sticking on different secured objects.
Upon monitoring the sticker, lighted by directed or scattered light, the areas including the optical variable element deflect light near to the sticker surface and for the monitor they look black.
Literature: l . US 4,062,628

Claims

1. A variable optical element of visible black colour, containing a transparent diffraction layer, which consists of at least two superposed in different directions (angular shifted) diffraction patterns, characterized in that it also includes an optical transformation layer (6), while the diffraction layer (5) configuration consists of two-dimensional shaped pyramids (9) with a raster distance (r), where the pyramids (9) are placed on, within the scope of 0,2 μιη - 0,4 μιη.
2. A variable optical element of visible black colour according to Claim 1, characterized in that the diffraction layer (5) configuration consists of regular tetragonal pyramids (9).
3. A variable optical element of visible black colour in accordance with Claim 1, characterized in that the diffraction layer (5) configuration consists of pyramids (9) with an unspecified number of angles, including cones.
4. A variable optical element of visible black colour according to Claim 1, characterized in that the diffraction layer (5) configuration of the optical variable element consists of periodically arranged and/or chaotically scattered areas, which areas include periodically arranged and/or chaotically scattered pyramids (9).
5. A variable optical element of visible black colour in accordance with Claims 1 - 4, characterized in that the diffraction layer (5) configuration of the optical variable element consists of upright and/or inclined pyramids (9).
6. A variable optical element of visible black colour according to Claims 1 - 5, characterized in that the optical transformation layer (6) of the optical variable element is transparent, while the configuration depth d of the diffraction layer (5) is within the scope of 0,2 um - 1 um.
7. A variable optical element of visible black colour in accordance with Claims 1 - 5, characterized in that the optical transformation layer (6) of the optical variable element is reflective, while the configuration depth d of the diffraction layer (5) is within the scope of 0,1 μιη - 0,5 μτη.
8. A variable optical element of visible black colour according to Claims 1 - 5, characterized in that the optical transformation layer of the optical variable element is the environmental medium, including air or vacuum.
PCT/BG2015/000019 2015-06-29 2015-06-29 Optical variable element WO2017000048A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/BG2015/000019 WO2017000048A1 (en) 2015-06-29 2015-06-29 Optical variable element
PCT/EP2016/065049 WO2017001424A1 (en) 2015-06-29 2016-06-28 Multilayer light-diffracting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BG2015/000019 WO2017000048A1 (en) 2015-06-29 2015-06-29 Optical variable element

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PCT/EP2016/065049 WO2017001424A1 (en) 2015-06-29 2016-06-28 Multilayer light-diffracting structure

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PCT/EP2016/065049 WO2017001424A1 (en) 2015-06-29 2016-06-28 Multilayer light-diffracting structure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112118965A (en) * 2018-07-09 2020-12-22 捷德货币技术有限责任公司 Optically variable security element with reflective surface area

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031786A1 (en) 2017-08-08 2019-02-14 Samsung Electronics Co., Ltd. Optical member, polarization member, and display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062628A (en) 1976-01-19 1977-12-13 Rca Corporation Black-and-white diffractive subtractive light filter
US20080272883A1 (en) * 2006-10-24 2008-11-06 Toppan Printing Co., Ltd. Display and labeled article
US20120229368A1 (en) * 2009-11-27 2012-09-13 Toppan Printing Co., Ltd. Display and labeled article

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201323B1 (en) * 1985-05-07 1994-08-17 Dai Nippon Insatsu Kabushiki Kaisha Article incorporating a transparent hologramm
DE102004032565A1 (en) * 2004-07-05 2006-02-16 Giesecke & Devrient Gmbh Security element with color shift effect

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062628A (en) 1976-01-19 1977-12-13 Rca Corporation Black-and-white diffractive subtractive light filter
US20080272883A1 (en) * 2006-10-24 2008-11-06 Toppan Printing Co., Ltd. Display and labeled article
US20120229368A1 (en) * 2009-11-27 2012-09-13 Toppan Printing Co., Ltd. Display and labeled article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112118965A (en) * 2018-07-09 2020-12-22 捷德货币技术有限责任公司 Optically variable security element with reflective surface area

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Publication number Publication date
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