Security device and method of manufacture
AssigneeDe La Rue International Limited
InventorBrian Holmes
Life of this patent
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Abstract
A security device is presented, including: an array of focusing elements, each focusing element being adapted to focus light in at least two orthogonal directions, the focusing elements being arranged on a regular two-dimensional grid; and an array of elongate image elements overlapping the array of focusing elements, configured such that each focusing element can direct light from any one of a respective set of at least two elongate image elements to the viewer, in dependence on the viewing angle. In a first region of the security device, the elongate image elements extend along a first direction, and in a second region of the security device, the elongate image elements extend along a second direction which is different to the first direction.
Claims22
A security device comprising:
- an array of focusing elements, the focusing elements being arranged on a regular two-dimensional grid extending in two orthogonal directions, each focusing element being adapted to focus light in the two orthogonal directions;
- and
- an array of elongate image elements overlapping the array of focusing elements, configured such that each focusing element can direct light from any one of a respective set of at least two elongate image elements to the viewer, in dependence on the viewing angle;
- wherein in a first region of the security device, the elongate image elements extend along a first direction, and in a second region of the security device, the elongate image elements extend along a second direction which is different to the first direction.
A method of manufacturing a security device, the method comprising:
- providing an array of focusing elements, the focusing elements being arranged on a regular two-dimensional grid extending in two orthogonal directions, each focusing element being adapted to focus light in the two orthogonal directions;
- and
- overlapping an array of elongate image elements with the array of focusing elements, the array of elongate image elements being configured such that each focusing element can direct light from any one of a respective set of at least two elongate image elements to the viewer, in dependence on the viewing angle;
- wherein in a first region of the security device, the elongate image elements extend along a first direction, and in a second region of the security device, the elongate image elements extend along a second direction which is different to the first direction.
Dependencies are inferred from the claim text.