EP0165021A2
Expired / Lapsed
EP
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A form depicting optical interference authenticatting device
Assignee: National Research Council Of Canada Te Ottawa Can
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Filing: 1985-06-06
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Granted: —
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Expires: 2005-06-06
Abstract
Abstract A hard to simulate, readily distinguishable from counterfeits, optical interference authenticating device comprises a substrate, and at least one optical interference, form depicting coating on the substrate and partially covering the substrate to delineate a known, distinct and readily distinguishable form thereon. The said at least one optical interference coating comprises at least one optical interference layer having known spectral reflectance and spectral transmittance characteristics when viewed at at least one particular angle so that the form is visible in particular colouration at the or each said particular angle of incidence of light thereon by reflected or transmitted light. At least one other optical interference coating may be provided on the substrate and may completely cover one side of it and the substrate may be transparent, semi-transparent or opaque, depending how the spectral characteristics are to be observed. A marginal edge portion of the form depicting coating may taper in thickness to provide a multi-coloured auriole around the form. When a plurality of form depicting coatings are provided they may partially overlie one another to provide a more complex pattern.
Inventors
- 👤 Jerzy A. Dobrowolski
- 👤 Fang C. Ho
- 👤 Allan J. Waldorf
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 18:10
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; B; B42; B42D; B42D25/00; B42D25/20; B42D25/29; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; G07; G07F; G07F7/00; G07F7/08; G07F7/086
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
A form depicting, optical interference authenticating device, comprising, a substrate and a form depicting, optical interference coating on the substrate, the form depicting coating partially covering one side the substrate and being shaped so that a distinctive form is provided thereon which may be discerned, the form depicting, optical interference coating comprising at least one optical interference layer the material and thickness of which have been selected for the form depicting coating to have particular known, spectral reflectance and spectral transmittance characteristics when viewed at a particular angle, whereby the distinctive form is made visible by reflected or transmitted light of particular colouration when viewed at the said particular angle.
Claim 2
Dependent Claim
110 words
A form depicting, optical interference authenticating device, comprising, a substrate and a form depicting, optical interference coating on the substrate, the form depicting coating partially covering one side the substrate and being shaped so that a distinctive form is provided thereon which may be discerned, the form depicting, optical interference coating comprising at least one optical interference layer the material and thickness of which have been selected for the form depicting coating to have particular known, spectral reflectance and spectral transmittance characteristics when viewed at a particular angle, whereby the distinctive form is made visible by reflected or transmitted light of particular colouration when viewed at the said particular angle.
Claim 3
Dependent Claim
23 words
A device according to claim 1, wherein the form depicting, coating covers only the surface area of the substrate which the form overlies.
Claim 4
Dependent Claim
26 words
A device according to claim 1, wherein the form depicting coating covers only the surface area of the substrate over which the form does not overlie.
Claim 5
Independent Claim
80 words
A device according to claim I, wherein a base, optical interference coating is provided, covering substantially the whole of one side of the substrate and is interposed between the substrate and the form depicting coating, the base coating comprising at least one optical interference layer the material and thickness of which have been selected for the base coating to have different, known, spectral reflectance and spectral transmittance characteristics to those of the form depicting coating at the said particular angle.
Claim 6
Independent Claim
80 words
A device according to claim I, wherein a covering, optical interference layer is provided, covering substantially the whole of the said one side of the substrate with the form depicting coating sandwiched therebetween the covering layer comprising at least one optical interference layer the materials and thickness of which have been selected for the covering layer to have spectral reflectance and spectral transmittance characteristics such that the said distinctive form is visible therethrough when viewed at the said particular angle.
Claim 7
Dependent Claim
13 words
A device according to claim 1, wherein the substrate is transparent or semi-transparent.
Claim 8
Dependent Claim
94 words
A device according to claim 6, wherein a further, optical interference coating is provided on the opposite side of the substrate to that on which the form depicting coating is disposed, the further, optical interference coating comprising at least one optical interference layer the materials and thicknesses of which have been selected to have spectral reflectance and spectral transmittance characteristics which, in combination with those of the form depicting coating, render the said distinctive form visible from at least one side of the device when the device is viewed at the said particular angle.
Claim 9
Dependent Claim
27 words
A device according to claim 1, wherein the substrate is opaque but seen coloured in reflection on the side on which the form depicting coating is disposed.
Claim 10
Dependent Claim
23 words
A device according to claim 1, wherein the substrate has a mirror finish on the side that the form depicting coating is disposed.
Claim 11
Dependent Claim
21 words
A device according to claim 1, wherein the form depicting coating is transparent or semi-transparent when viewed at a particular angle.
Claim 12
Dependent Claim
24 words
A device according to claim 1, wherein the form depicting coating is seen to reflect a mirror-like image when viewed at a particular angle.
Claim 13
Dependent Claim
19 words
A device according to claim 1, 3 or 4; wherein at least one optical interference coating varies in thickness.
Claim 14
Dependent Claim
43 words
A device according to claim 2, wherein the form depicting coating has a marginal portion which decreases in thickness in an outward direction which will show a multi-coloured aureole around the form when the form depicting coating is viewed at a particular angle.
Claim 15
Dependent Claim
86 words
A device according to claim 1, wherein the form depicting coating is one of a plurality of form depicting coatings each comprising a number of form depicting, optical interference layers and each having different, known spectral reflectance and spectral transmittance characteristics at the said particular angle, and a plurality of optical interference coatings are provided each covering the whole of the substrate and being disposed between two form depicting coatings and each having different, known spectral reflectance and spectral transmittance characteristics at the said particular angle.
Claim 16
Dependent Claim
15 words
A device according to claim 14, wherein the form depicting coatings partially overlie one another.
References Cited (Backward Citations)
No citation records indexed.
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