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EP0178232A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Identity document protected against falsification and method for manufacturing the same

Assignee: Societe des Telephones Ericsson SA
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Filing: 1985-10-11
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Granted: —
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Expires: 2005-10-11
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Abstract

Abstract Translated from French Le document comporte des indications graphiques à au moins deux niveaux d'absorption de lumière, comprenant des informations alphanumériques portées en clair, spécifiques au titulaire et/ou au document et éventuellement une partie figurative, les indications apparaissant sur un fond tramé, la surface du document est décomposée en un réseau de macropixels présentant chacun un niveau d'absorption moyen déterminé, et chaque macropixel est constitué à son tour par une matrice de micropixels ayant chacun une absorption choisie parmi au moins deux niveaux et répartis de façon à maintenir l'absorption moyenne de chaque macropixel et à constituer la trame qui reproduit à échelle microscopique une partie au moins des indications spécifiques. The document includes graphical indications with at least two levels of light absorption, comprising alphanumeric information carried in clear, specific to the holder and / or to the document and possibly a figurative part, the indications appearing on a screen background, the surface of the document is broken down into a network of macropixels each having a determined average absorption level, and each macropixel is in turn constituted by a matrix of micropixels each having an absorption chosen from at least two levels and distributed so as to maintain the absorption average of each macropixel and to constitute the frame which reproduces at microscopic scale at least part of the specific indications.

Inventors

  • 👤 Alain Boissier
  • 👤 Alain Glatigny

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 17:30
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/40; B42D25/405; B42D2035/08; B42D2035/14; B42D2035/20; B42D2035/44; B42D2035/50; B42D25/48; B42D25/485; Y; Y10; Y10S; Y10S283/00; Y10S283/904

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

WO1983000570A1 Cited

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