US 12,011,945 B2
Methods for designing and producing a security feature
Robert Laird Stewart, La Tour de Peilz (CH)
Assigned to Koenig & Bauer Banknote Solutions SA, Lausanne (CH)
Appl. No. 18/266,562
Filed by Koenig & Bauer Banknote Solutions SA, Lausanne (CH)
PCT Filed Dec. 14, 2021, PCT No. PCT/EP2021/085667
§ 371(c)(1), (2) Date Jun. 9, 2023,
PCT Pub. No. WO2022/129032, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 2019780 (GB), filed on Dec. 15, 2020.
Prior Publication US 2024/0051325 A1, Feb. 15, 2024
Int. Cl. B42D 25/342 (2014.01); B42D 25/21 (2014.01)
CPC B42D 25/342 (2014.10) [B42D 25/21 (2014.10)] 27 Claims
OG exemplary drawing
 
1. A method of designing at least an area of a printed image in a security feature, the security feature comprising an array of optical elements overlaying the printed image, the method comprising:
designing an icon matrix comprising rows and columns of pixels having pixel values, the icon matrix representing an icon to be viewed by a user of the security feature;
determining a desired gap size to provide a desired magnification of the icon, wherein the desired magnification is equal to an icon matrix size once printed divided by the desired gap size;
generating an array of two dimensional matrices of pixels, wherein the array of two dimensional matrices of pixels comprises a sequence of repeated sets of matrices,
wherein each set comprises a first number of matrices of a first type having a first size and a second number of matrices of a second type having a second size,
wherein a matrix of the first type and a matrix of the second type are based on the icon matrix, wherein the matrix of the first type corresponds to the icon matrix,
and wherein the first number, second number, first size, and second size are selected such that, a mean size of each matrix within the set deviates from a modal matrix size by the desired gap size, wherein a pitch of the array of optical elements is equal to the modal matrix size, and
wherein the matrix of a second type comprises at least one additional column than the matrices of a first type, or wherein the matrix of a second type comprises at least one less column than the matrices of a first type.