US 12,697,832 B2Granted

Optical security device

OwnerMarek Skeren, Zbynek Ryzi +1inventors

InventorsMarek Skeren, Zbynek Ryzi, Roman Nahalka

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Abstract

An security device comprises a recorded representation of an optically variable image which is reconstructable and viewable for a security purpose, and comprises: an optical structure having recorded therein a representation of the optically variable image in the form of a plurality of discrete portions of the complete image to be reconstructed, wherein the plurality of image portions can, when reconstructed, only be viewed in their totality by viewing the image at or over a plurality of different viewing angles or angle ranges relative to the optical structure and/or at or over a plurality of different angles or range of angles of illumination of the optical structure, and wherein the size, in at least one dimension, of the complete image, when reconstructed, is greater than the corresponding size, in the same dimension, of a part of the optical structure having the plurality of image portions are collectively recorded therein.

Claims21

Dependent claims

An optical security device comprising a recorded or encoded representation of an optically variable image, the image being reconstructable and viewable for security, authentication or identification purposes, the device comprising:

an optical structure in which there is recorded or encoded a representation of the optically variable image in a form of a plurality of portions of a complete said image to be reconstructed,
wherein respective ones of said plurality of portions of the optically variable image can, when reconstructed, only be viewed in their totality by viewing said complete image (i) at or over a plurality of different viewing angles or angle ranges relative to the optical structure, or (ii) at or over a plurality of different angles or ranges of angles of illumination of the optical structure, or both (i) and (ii), and
wherein a size, in at least one dimension, direction, axis or plane, of a complete reconstructed image is greater than the corresponding size, in same, or respective same, dimension, direction, axis or plane, of a part of the optical structure having said plurality of portions of the image collectively recorded or encoded therein.

Dependencies are inferred from the claim text.

Facts

Application: 17/284,014Filed 11 Oct 2019
Priority: GB 181664112 Oct 2018
Published: US 2021/0379921 A19 Dec 2021
Granted: 4 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B42D 25/328
Identification or security features, e.g. for preventing forgery: diffraction gratings; Holograms
G03H 1/0011
Adaptation of holography to specific applications: for security or authentication
G03H 1/2249
Processes or apparatus for obtaining an optical image from holograms: holobject properties
B42D 25/351
Identification or security features, e.g. for preventing forgery: translucent or partly translucent parts, e.g. windows