| 摘要 |
FIELD: physics; signaling. ^ SUBSTANCE: invention relates to banking. The technical result is extension of service life and improving security of bank cards, banknotes and security papers with a rectangular shape. Corners of bank cards, banknotes or security papers with a rectangular shape are elliptically cut which converts them into a rectangle with rounded corners, and on adjacent sides which form the right top and/or left bottom corner there is light detector and an optical light guide with a light emitter, directed towards the former sharp corner. Light detectors, light guides and light emitters are placed in pairs on the lateral and adjacent sides. The light detector is placed at the edge of the bank card, banknote or security paper at a maximum possible distance from the position of the light emitter. There is also an additional light detector, light guide and light emitter which should be placed on a straight line which vertically intersects the bank card, banknote or security paper perpendicular its lateral sides and parallel its adjacent sides and should not be on lines of most likely bending of the bank card, banknote/security paper. ^ EFFECT: use of the method reduces production expenses and reduces loss on forgery. ^ 3 dwg |
