Optical variable device

Abstract: A thin and flexible radio frequency (RF) antenna tag or label is disclosed which contains an RF circuit connected to an antenna which is created by demetallizing the area around the antenna pattern on a thin, metallized substrate such as a film or paper web. Antenna(s) may be formed on one or both sides of the substrate and can contain printed, holographic, optical variable device, diffractive, dot matrix, computer-generated holograms or computer-generated optical images. The demetallized RF antenna on the substrate can optionally further be transferred to a second substrate or web by means of a cold foil stamping process. The tag or label is thin and flexible, enabling a wide range of applications including RF tagging of anti-theft devices, product packaging of all types, credit cards, passports, admission tickets, stamps, vehicles, badges, fare cards, roadway tolls, customs and immigration checkpoints identification, and animal identification/tracking devices.

Abstract: PROBLEM TO BE SOLVED: To provide a transfer material, an image display medium and an image-forming method which can simply produce highly colorful and highly decorative images having visual effects similar to images in a diffraction structure (optical variable device: OVD). SOLUTION: For an optical diffraction structure transfer member, a release layer, a coloring layer, an optical diffraction structure forming layer (a relief forming layer, a reflecting thin film layer), and an adhesive layer are formed at one side of a base while a back coat layer is formed at the side opposite to the release layer, and the coloring layer is coated in various colors and the colors are transferred and formed in a dotted image 12 onto a body 10 on which the transfer is made, and thereby an image display medium 11 is obtained. The dotted image 12 is constructed of dots 13 formed of various colors constituting a color image and diffraction gratings, and both of a color image and a diffraction grating image can be seen therefrom, and different images can be formed out of every one of the image display media 11.

Abstract: PROBLEM TO BE SOLVED: To provide a counterfeit-prevented paper having an OVD (optical variable device) included in the paper by papermaking, and capable of imparting verification function without damaging the image of the OVD. SOLUTION: The counterfeit-prevented paper has the OVD part 20 on a base material 10. The OVD part 20 is composed of a thread obtained by laminating an OVD layer 2 on a supporter 31, and cutting the laminate so as to have a narrow width, and included in the paper so that the supporter 31 side may present at the front surface side by the papermaking. The OVD layer 2 transmits light, and a verification functional layer 1 of an information pattern by which the verification can be carried out is formed by a fluorescent ink or the like between the supporter layer 31 and the OVD layer 2. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract: Optically variable devices (OVDs) are becoming ever more popular as tools to provide security for documents and products subject to counterfeiting, forgery, and/or diversion. Issues faced during the design and implementation of OVDs for a specific security application include matching the proper security feature for its intended function, determining the method of the security features authenticity, and incorporating effective anti- counterfeiting protection for the OVD itself. Combining additional synergistic security technologies can be an effective approach to meeting the desired objectives in designing and implementing a security feature.