摘要:
Metal catalytic film comprising a flexible substrate having a surface, a catalytic metal layer adherent to said surface of the substrate and having a thickness ranging from 200 to 1000 Angstroms.Method for forming metal catalytic film on a flexible substrate having a surface in a vacuum chamber comprising the steps of evacuating the vacuum chamber to a predetermined vacuum, introducing a substantially inert heavy gas into the vacuum chamber, creating a vapor stream of molecules of a catalytic metal in the vacuum chamber whereby the molecules of the catalytic metal are scattered by the inert heavy gas and are subsequently deposited upon the surface of the substrate to form a catalytic metal layer to a thickness ranging from 200 to 1000 Angstroms.
摘要:
Tamper evident optical device comprising a substrate and a multi-layer taper evident splittable coating carried by the substrate. The coating has a release region formed therein. An adhesive is secured to the tamper evident coating.
摘要:
Thin film optical variable article to be used in a reflection mode having a gold to green color shift with angle for currency authentication and adapted to be carried by a substantially opaque currency sheet which serves as a substrate. The article includes a substantially transparent, optically thick element carrying a colorant and having first and second surfaces and a multilayer interference coating carried on one of said first and second surfaces. The article is adapted to be carried by the currency sheet so that the coating faces the currency sheet and the colorant carrying element serves as a superstrate facing the incident light. The multilayer interference coating is comprised of a substantially opaque layer of aluminum nearest the substrate, followed by a layer of magnesium fluoride, and then by a layer of chromium having substantial transmission. The colorant has a yellow hue whereby at normal incidence of light the article has a coppery-gold color shifting towards a vivid green at non-normal incidence of light. The colorant operates in an essentially subtractive mode to cause a modification of the normal incidence gold color and the color shift with angle properties as seen by reflection.
摘要:
Thin film optical variable article to be used in a reflection mode having a gold to green color shift with angle for currency authentication and adapted to be carried by a substantially opaque currency sheet which serves as a substrate. The article includes a substantially transparent, optically thick element carrying a subtractive colorant and having first and second surfaces and a multilayer interference coating carried on one of said first and second surfaces. The article is adapted to be carried by the currency sheet so that the coating faces the currency sheet and the colorant carrying element serves as a superstrate facing the incident light. The multilayer interference coating is comprised of a substantially opaque layer of aluminum nearest the substrate, followed by a layer of magnesium fluoride, and then by a layer of chromium having substantial transmission. The colorant has a yellow hue. At normal incidence of light the article has a coppery-gold color shifting towards a vivid green at non-normal incidence of light. The colorant operates in an essentially subtractive mode in combination with the multilayer interference coating to provide the color shift from gold to green at two different angles of incidence and substantially no color at higher angles of incidence to cause a modification of the normal incidence gold color and the color shift with angle properties as seen by reflection.
摘要:
The invention relates to anisotropic, reflective, magnetic flakes. In a liquid carrier and under influence of an external magnetic field, the flakes attract to one another side-by-side and form ribbons which provide higher reflectivity to a coating and may be used as a security feature for authentication of an object.
摘要:
A structure for providing an optical effect includes first and second substrates hot stamped together by an adhesive. The adhesive includes an energy activated binder having a plurality of particles distributed therein or thereon for providing the optical effect detectable through the first substrate. The particles may be optically variable flakes, thin film light interference flakes, diffractive flakes, and reflective flakes.
摘要:
An optical device is formed by hot stamping a demetallized hologram to an optically variable foil or to a coating of optically variable ink. In another embodiment a hologram is hot stamped to a banknote or document printed with a color-shifting ink.
摘要:
A multi-cell electrochromic device comprises a plurality of solid-state electrochromic cells that are arranged in an optical alignment. Each electrochromic cell is separated from an adjacent electrochromic cell in the optical alignment by a transparent conductive layer that is shared by the two adjacent electrochromic cells.
摘要:
A security image and method for forming said image is disclosed wherein an image having a layer with a hologram therein has an additional layer of magnetically aligned flakes together forming an image that is difficult to counterfeit and is highly attractive. Preferably windows of an opaque layer provide additional means of encoding or forming the image.
摘要:
A method for forming an optically variable device upon a substrate comprises the steps of: patterning a reflective layer on the substrate using an oil-ablation technique; removing oil residue from the first side of the substrate using a first glow discharge; and depositing thin-film layers so as to be supported by the substrate to form the optically variable device. Optionally, oil residue is removed from the second side of the substrate using a second glow discharge.