Optical devices and methods of manufacture thereof

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12240261
APP PUB NO 20240051324A1
SERIAL NO

18271337

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Abstract

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An optical device is provided that exhibits a variable optical effect upon illumination. The optical device has a diffractive structure comprising: a portion of a first kinoform diffractive structure that encodes a first image, arranged to form a first diffractive region (11) of the diffractive structure; and a portion of a second kinoform diffractive structure that encodes a second image, arranged to form a second diffractive region (13) of the diffractive structure; wherein the first diffractive region and the second diffractive region are laterally separate; and each of the first diffractive region and the second diffractive region are discernible by the naked human eye. Methods of manufacture of such optical devices are also disclosed.

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Patent Owner(s)

  • DE LA RUE INTERNATIONAL LIMITED

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fournier, Frederic Basingstoke, GB 11 16
Holmes, Brian Basingstoke, GB 34 182
King, Maria Basingstoke, GB 4 0

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