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EP0077464B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Kinoform

Assignee: Siemens Building Technologies AG
•
Filing: 1982-09-15
•
Granted: 1985-10-09
•
Expires: 2002-09-15
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Abstract

Abstract 1. A method of producing a kinoform wherein the amplitude distribution function of a plurality of discrete picture elements of an image which is to be reproduced by the kinoform upon coherent irradiation, is established, recorded and converted by computer means into the associated phase distribution function which is required at the location of the kinoform characterised in that for the purposes of producing a kinoform of a code word comprising M discrete light/dark picture elements with 2 =< M =< 50, when establishing the amplitude distribution function of the image to be reproduced, each of the picture elements is replaced by a picture spot which in turn comprises N discrete picture elements which all have approximately the same intensity of radiation, wherein N is so selected that the product of M and N amounts to several hundreds.

Inventors

  • 👤 Heinrich Peter Baltes
  • 👤 Michel Vincent Romerio

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 11:35
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/20; G03; G03H; G03H1/00; G03H1/04; G03H1/08; G03H1/0841; G06; G06K; G06K1/00; G06K1/12; G06K1/126; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/16; G07D7/06; G07D7/12; G07F; G07F7/00; G07F7/08; G07F7/086; G03H2001/085

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 137 words
A method of producing a kinoform wherein the amplitude distribution function of a plurality of discrete picture elements of an image which is to be reproduced by the kinoform upon coherent irradiation, is established, recorded and converted by computer means into the associated phase distribution function which is required at the location of the kinoform characterised in that for the purposes of producing a kinoform of a code word comprising M discrete light/dark picture elements with 2 ≤ M ≤ 50, when establishing the amplitude distribution function of the image to be reproduced, each of the picture elements is replaced by a picture spot which in turn comprises N discrete picture elements which all have approximately the same intensity of radiation, wherein N is so selected that the product of M and N amounts to several hundreds.
Claim 2
Independent Claim 137 words
A method of producing a kinoform wherein the amplitude distribution function of a plurality of discrete picture elements of an image which is to be reproduced by the kinoform upon coherent irradiation, is established, recorded and converted by computer means into the associated phase distribution function which is required at the location of the kinoform characterised in that for the purposes of producing a kinoform of a code word comprising M discrete light/dark picture elements with 2 ≤ M ≤ 50, when establishing the amplitude distribution function of the image to be reproduced, each of the picture elements is replaced by a picture spot which in turn comprises N discrete picture elements which all have approximately the same intensity of radiation, wherein N is so selected that the product of M and N amounts to several hundreds.
Claim 3
Dependent Claim 35 words
A method according to claim 1, characterised in that each of the picture elements is replaced by a picture spot comprising N discrete picture elements, with N being of the order of magnitude of 50.
Claim 4
Dependent Claim 32 words
A method according to claim 1 or claim 2, characterised in that the discrete light/dark picture elements of the code word are so formed that they have only two discrete light/dark values.
Claim 5
Dependent Claim 33 words
A method according to claim 1 or claim 2, characterised in that the discrete light/dark picture elements of the code word are so formed that they have more than two discrete level values.
Claim 6
Dependent Claim 20 words
Use of the method according to one of claims 1 to 4 for producing authenticity features on documents representing value.

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