Moire magnification device
AssigneeDe La Rue International Limited
InventorBrian William Holmes
Life of this patent
Estimating the term…
Abstract
A moiré magnification device includes a transparent substrate, the transparent substrate carrying a regular array of micro-focusing elements on a first surface, where the focusing elements define a focal plane, and a corresponding array of microimage element unit cells located in a plane substantially coincident with the focal plane of the focusing elements, where each unit cell includes at least two microimage components. The pitches of the micro-focusing elements and the array of microimage element unit cells and their relative locations are such that the array of micro-focusing elements cooperates with the array of microimage element unit cells to generate magnified versions of the microimage components due to the moiré effect.
Claims28
A moiré magnification device comprising a transparent substrate carrying:
- i) a regular array of micro-focusing elements on a first surface, the focusing elements defining a focal plane;
- ii) a corresponding array of microimage element unit cells located in a plane substantially coincident with the focal plane of the focusing elements, each unit cell comprising at least two microimage components;
- wherein the pitches of the micro-focusing elements and the array of microimage element unit cells and their relative locations are such that the array of micro-focusing elements cooperates with the array of microimage element unit cells to generate magnified versions of the microimage components due to the moiré effect,
- wherein in at least one of the unit cells comprising at least two microimage components, a first microimage component of the unit cell has a color density different than the color density of the other, second microimage component,
- and wherein a further colored layer is provided on or extending over the array of microimage element unit cells such that when the device is viewed, at least the second microimage components appear in a color dependent at least partly on the further colored layer and which is different from the color of the first microimage components.
Dependencies are inferred from the claim text.