Global Patent Index - EP 3842252 A1

EP 3842252 A1 20210630 - MICROOPTICAL SYSTEM FOR THE FORMATION OF THE 3D IMAGE IN THE ZERO ORDER OF DIFFRACTION

Title (en)

MICROOPTICAL SYSTEM FOR THE FORMATION OF THE 3D IMAGE IN THE ZERO ORDER OF DIFFRACTION

Title (de)

MIKROOPTISCHES SYSTEM ZUR ERZEUGUNG EINES 3D-BILDES IN DER NULLTEN BEUGUNGSORDNUNG

Title (fr)

SYSTÈME MICRO-OPTIQUE POUR LA FORMATION DE L'IMAGE 3D DANS L'ORDRE ZÉRO DE DIFFRACTION

Publication

EP 3842252 A1 20210630 (EN)

Application

EP 19219414 A 20191223

Priority

EP 19219414 A 20191223

Abstract (en)

The claimed microoptical system for visual control of products belongs mainly to the field of optical security technologies and is used to authenticate banknotes, documents, passports, IDs, plastic cards, securities, and brands.The microoptical system consists of fragments of multilevel kinoforms and fragments of diffraction gratings of various periods and directions. In accordance with the claims, a method for synthesizing microoptical systems for forming 3D images in the zero diffraction order is described. Multilevel kinoform is used for the formation of 3D-images. A method for computing the microrelief of a microoptical system that forms a 3D image at diffraction angles smaller than 60° is proposed. At large diffraction angles the observer sees another 2D color image.Microoptical systems are manufactured using electron beam technology and can be replicated using standard equipment for the manufacture of embossed holograms.

IPC 8 full level

B42D 25/328 (2014.01)

CPC (source: EP)

B42D 25/328 (2014.10)

Citation (applicant)

  • EA 018419 B1 20130730 - OOO COMP HOLOGRAPHY CT [RU]
  • EA 018164 B1 20130530 - OBSCHESTVO S [RU]
  • US 2007268536 A1 20071122 - HOLMES BRIAN W [GB], et al
  • RUDOLF L. VAN RENESSE: "Optical Document Security", 2005, ARTECH HOUSE
  • A.V. GONCHARSKYA.A. GONCHARSKY: "Computer Optics & Computer Holography", 2004, MOSCOW UNIVERSITY PRESS
  • L.B.LESEMP.M.HIRSCHJ.A.JR. JORDAN: "The kinoform: a new wavefront reconstruction device", IBM J. RES. DEV., vol. 13, 1969, pages 105 - 155
  • A. GONCHARSKYA. GONCHARSKYS. DURLEVICH: "Diffractive optical element with asymmetric microrelief for creating visual security features", OPT. EXPRESS, vol. 23, 2015, pages 29184 - 29192

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 3842252 A1 20210630; EP 3842252 B1 20220525; CY 1125504 T1 20240920

DOCDB simple family (application)

EP 19219414 A 20191223; CY 221100567 T 20220823