FIELD: storage.
SUBSTANCE: improved form of optical security device for use in the protection of documents and articles of value from counterfeit and to verify authenticity is provided. Inventive device is made up of array of icon focusing elements, at least one grayscale in-plane image, and a plurality of coextensive control patterns of icons contained on or within the in-plane image, wherein each control pattern being mapped to areas of the grayscale in-plane image having a range of grayscale levels.
EFFECT: device provides enhanced design capability, improved visual impact, and greater resistance to manufacturing variations.
15 cl, 15 dwg
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