Optical security marking component, method of manufacturing such a component, system comprising such a component, and reader for checking such a component

Optical security marking component, method of manufacturing such a component, system comprising such a component, and reader for checking such a component

  • CN 101,484,831 A
  • Filed: 05/02/2007
  • Published: 07/15/2009
  • Est. Priority Date: 05/02/2006
  • Status: Active Application
First Claim
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1. optical security marking component, described optical security marking component is presenting the first visible form through being orientated with first when directed polariscope is observed, and producing the second visible form different when directed polariscope is observed with the first visible form through being orientated with second, described optics comprises through impression and is used to form at least two films with diffraction grating of different orientation, described optics is characterised in that, each has the cycle less than 550nm in the described grating, and has modulation between 0.25 to 0.5 with respect to reference planes.

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