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A security device formed by a hologram and a color shifting ink

An ink and device technology, applied in the field of security devices formed by holograms and color-changing inks

Inactive Publication Date: 2007-11-14
JDS UNIPHASE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] At the same time the application of OV inks is convenient and economical, but by itself only provides a moderate level of safety

Method used

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  • A security device formed by a hologram and a color shifting ink
  • A security device formed by a hologram and a color shifting ink
  • A security device formed by a hologram and a color shifting ink

Examples

Experimental program
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Embodiment Construction

[0041] According to the present invention, a security label or chromaticity chart is formed on the surface of an item by printing an optically variable ink on a substrate and subsequently adhesively bonding a patterned structure thereon.

[0042] The optically variable ink includes a vehicle medium with OV flakes dispersed therein. It should be understood that the carrier medium can be of many types. Examples are the aqueous OV inks disclosed in US Patent 7,029,525 to Mehta, and the polymer-based OV inks taught in US Patent 5,279,657 to Phillips et al. By way of example, the OV ink vehicle is an acrylic or urethane based ink. It should be understood that a thicker vehicle with OV flakes in it is also referred to as an OV paint, which is considered the type of OV ink for the purposes of this application. In some embodiments, the vehicle is colored and / or includes magnetic particles.

[0043] The OV flakes may be, for example, color changing flakes as disclosed in US Patent 6...

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Abstract

A method of forming a label on an object (24) is provided, comprising the steps of coating a surface of the object (64) with optically variable ink, and bonding a patterned structure to the object (24) with a light transmissive adhesive over the optically variable ink. The patterned structure allows light to propagate therethrough, and may be a diffractive structure comprising one of: a semi transparent reflective layer, a high refraction index layer, and a patterned reflective coating. In one embodiment a hologram is hot stamped to a banknote or paper document printed with a color-shifting ink.

Description

technical field [0001] The present invention relates to forming a label on the surface of an item by printing an optically variable ink on the item and adhesively bonding a patterned structure, such as a hologram, to the optically variable ink by, for example, thermal embossing. Background technique [0002] Security labels, also known as optical security devices, are used to protect various items from counterfeiting. These items include paper documents, banknotes, merchandise, packaging, etc. Typically, security labels are adhesively bonded or heat embossed on the surface of an article or package. [0003] A type of security label that is an optical structure that exhibits the effect of an embossed or etched surface relief pattern, such as a hologram or diffraction grating, and patterns having, for example, alphanumeric features, bar codes, or pictorial or pictorial designs , and other optical effects in the area surrounding this pattern. This structure is described in U...

Claims

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Application Information

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IPC IPC(8): B44F1/10B44F1/12B44F7/00G09F3/03G09F3/10
CPCB42D2035/24B42D2033/18G03H1/0256B42D25/29B42D25/328B42D25/378G03H1/00
Inventor 罗杰·W.·菲利普斯埃琳娜·塔戈尔
Owner JDS UNIPHASE CORP
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