Security device and its production method
First Claim
1. A method of providing a security device, the method comprising printing materials on to two or more regions of a substrate, each region containing a material or combination of materials wherein the two or more regions exhibit substantially the same visible colour under first viewing conditions defined as visible light having a wavelength greater than 380 and less than 750 nm and different visible colours under second viewing conditions, the second viewing conditions comprising a combination ofa) the visible light andb) light of substantially any UV wavelength in the range 235-380 nm,wherein the at least two regions each include a homogeneous mix of at least one pigment that luminesces under UV irradiation and at least one pigment that is visible under visible light, and wherein each region exhibits a first colour under visible light and different second colours under the second viewing conditions, and wherein the at least two regions define one or more of graphical patterns, indicia, security patterns and images.
1 Assignment
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Accused Products
Abstract
A security device comprises two or more regions (1, 2). Each region (1, 2) contains a material or combination of materials wherein the two or more regions exhibit substantially the same visible appearance under first viewing conditions and different visible appearances under second viewing conditions, the second viewing conditions. The second viewing conditions comprise a combination of a) visible light and b) substantially any UV wavelength.
11 Citations
28 Claims
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1. A method of providing a security device, the method comprising printing materials on to two or more regions of a substrate, each region containing a material or combination of materials wherein the two or more regions exhibit substantially the same visible colour under first viewing conditions defined as visible light having a wavelength greater than 380 and less than 750 nm and different visible colours under second viewing conditions, the second viewing conditions comprising a combination of
a) the visible light and b) light of substantially any UV wavelength in the range 235-380 nm, wherein the at least two regions each include a homogeneous mix of at least one pigment that luminesces under UV irradiation and at least one pigment that is visible under visible light, and wherein each region exhibits a first colour under visible light and different second colours under the second viewing conditions, and wherein the at least two regions define one or more of graphical patterns, indicia, security patterns and images.
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2. A method of providing a security device, the method comprising printing materials on to two or more regions of a substrate, each region containing a material or combination of materials wherein the two or more regions exhibit different visible colours under first viewing conditions defined as visible light having a wavelength greater than 380 and less than 750 nm and substantially the same visible colour under second viewing conditions, the second viewing conditions comprising a combination of
a) the visible light and b) light of substantially any UV wavelength in the range 235-380 nm, wherein the at least two regions each include a homogenous mix of at least one pigment that luminesces under UV irradiation and at least one pigment that is visible under visible light, and wherein each region exhibits different first colours under visible light and a different second colour under the second viewing conditions, and wherein the at least two regions define one or more of graphical patterns, indicia, security patterns and images.
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3. A security device comprising two or more regions, each region being printed with a material or combination of materials wherein the two or more regions exhibit substantially the same visible colour when viewed under first viewing conditions defined as visible light having a wavelength greater than 380 and less than 750 nm and different visible colours under second viewing conditions, the second viewing conditions comprising a combination of
a) the visible light and b) light of substantially any UV wavelength in the range 235-380 nm, wherein the at least two regions each include a homogeneous mix of at least one pigment that luminesces under UV irradiation and at least one pigment that is visible under visible light, and wherein each region exhibits a first colour under visible light and different second colours under the second viewing conditions, and wherein the at least two regions define one or more of graphical patterns, indicia, security patterns and images.
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16. A security device comprising two or more regions, each region being printed with a material or combination of materials wherein the two or more regions exhibit different visible colours when viewed under first viewing conditions defined as visible light having a wavelength greater than 380 and less than 750 nm and substantially the same visible colours under second viewing conditions, the second viewing conditions comprising a combination of
a) the visible light and b) light of substantially any UV wavelength in the range 235-380 nm, wherein the at least two regions each include a homogenous mix of at least one pigment that luminesces under UV irradiation and at least one pigment that is visible under visible light, and wherein each region exhibits different first colours under visible light and a different second colour under the second viewing conditions, and wherein the at least two regions define one or more of graphical patterns, indicia, security patterns and images.
Specification