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Optically variable devices, their production and use

  • US 10,414,194 B2
  • Filed: 11/06/2014
  • Issued: 09/17/2019
  • Est. Priority Date: 11/08/2013
  • Status: Active Grant
First Claim
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1. An optically variable device, the device comprising:

  • a control element or layer comprising a material that is permanently or temporarily electrically charged or polarized such that an electric field emanates from the material;

    one or more responsive optical element(s);

    the control element or layer and the responsive optical element(s) moveable in the device relative to one another upon application of an external influence upon the device, to change the distance of separation of the control element or layer from the responsive optical element(s), and therefore to change the strength of the electric field impinging upon the responsive optical element(s) from the electrically charged or polarized material of the control element or layer;

    the relative movement and/or the change of the strength of the electric field impinging upon the responsive optical element(s) causing a change of perceivable or detectable optical properties of the device,wherein the control element or layer comprises an electrically insulating material that exhibits, or can be caused to adopt, a positive or negative electric charge or polarization sufficient to cause the electric field.

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