Back to results
US 2009/0153967 A1Published application
Optical security device offering 2d image
AssigneeOptaglio SRO
InventorsLibor Kotacka, Petr Vizdal, Vladimir Kolarik, Lukas Danek
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeOptaglio SRO
InventorsLibor Kotacka, Petr Vizdal, Vladimir Kolarik, Lukas Danek
Estimating the term…
The present invention provides for a diffractive element comprising a diffractive optical microstructure consisting of a modulated structure of a diffractive type which upon illumination by diffused ambient light creates a two-dimensional image to be viewed by an observer upon tilting or rotating the device or by varying lighting direction, wherein the diffractive modulated structure of the device consists of various generally parameterised special optical elements with specifically prescribed groove shapes, wherein each groove shape, position, centre(s), and line thickness, are described by functions describing those dependencies which are variables of the positional coordinate of the optical element.
A diffractive element comprising a diffractive optical microstructure consisting of a modulated structure of a diffractive type which upon illumination by diffused ambient light creates a two-dimensional image to be viewed by an observer upon tilting or rotating the device or by varying lighting direction, wherein the diffractive generally parameterised special optical elements with specifically prescribed groove shapes, wherein each groove shape, position, centre(s), and line thickness, are described by functions describing those dependencies which are variables of the positional coordinate of the optical element.
A method of creating a two-dimensional image, especially imitating a simple geometrical motifs, a microrelief or otherwise modulated structure(s) of a diffractive type is created wherein the diffractive microrelief consists of various generally parameterised special optical elements:
Dependencies are inferred from the claim text.