Method of forming a security device
Номер патента: EP4051508A1
Опубликовано: 07-09-2022
Автор(ы): Brian William Holmes
Принадлежит: De la Rue International Ltd
Опубликовано: 07-09-2022
Автор(ы): Brian William Holmes
Принадлежит: De la Rue International Ltd
Реферат: A method of forming a security device is provided. The method comprises providing a substrate comprising an array of plasmonic nanostructures, providing a first array of sampling elements over the substrate, and irradiating one or more regions of the array of plasmonic nanostructures through the first array of sampling elements with electromagnetic radiation so as to modify the geometry of the plasmonic nanostructures in the one or more regions and thereby modify the optical response of the array of plasmonic nanostructures in the one or more region. The one or more regions define an array of image elements configured for viewing through an array of sampling elements such that an optically variable effect is exhibited by the array of sampling elements and the array of image elements in combination in dependence upon the viewing angle.
Method of manufacturing microlens, microlens, optical film, screen for projection, and projector system
Номер патента: US20050088750A1. Автор: Hironori Hasei. Владелец: Seiko Epson Corp. Дата публикации: 2005-04-28.