SYSTEMS AND METHODS FOR CREATING VARIABLE OPTICAL EFFECTS ON MEDIA

Methods and systems for creating optical effects in pigments, inks, and on media are described. There is in particular described a system or indicia for use as a security or identification feature comprising a combination of material that is capable of inducing a change of optical appearance of the...

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Bibliographische Detailangaben
1. Verfasser:	DOWNING, ELIZABETH, A
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES CHECKING-DEVICES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DYES FILLING PASTES FREQUENCY-CHANGING HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING INKS LAKES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	Methods and systems for creating optical effects in pigments, inks, and on media are described. There is in particular described a system or indicia for use as a security or identification feature comprising a combination of material that is capable of inducing a change of optical appearance of the system or indicia in response to exposure to ultraviolet (UV) light. The combination of materials includes at least a first material that changes its optical appearance under exposure to UV light and a second material that provides a color under ambient visible light or under exposure to UV light. The first and second materials are selected in such a way that exposure to UV light causes a visible spectrum of the system or indicia to dynamically shift over time from a first spectrum to a second spectrum distinct from the first spectrum