Abstract:
The invention relates to a heat-sealing film comprising a support layer (70) and a heat-sealing adhesive layer (74) having an adhesion side facing away from the support layer (70) and a metallised layer (73) disposed between the support layer (70) and the heat-sealing adhesive layer (74), into which metallised layer at least one security feature (2) is incorporated, a hot-melt adhesive layer (75) being applied to the adhesion side along the adhesion side of the heat-seal adhesive layer (74).
Abstract:
Apparatus and method for producing optically variable devices, optically variable media, dot matrix holograms or embossing substrates. The system includes: a laser beam generator, a laser beam shaper, a spatial light modulator, imaging optics and an image positioner. The laser beam generator generates a laser beam, which is shaped by the laser beam shaper to modify the laser beam to an optimized beam profile. The shaped laser beam is modulated by the spatial light modulator, which generates, at a place removed from the substrate surface, an optical pattern. The imaging optics causes the optical pattern to be imaged on the substrate surface. An image positioner allows for the optical pattern to be positioned to different areas of the substrate surface. The system can produce adapted optically variable devices, optically variable media, dot matrix holograms or embossing substrates.
Abstract:
A method of making a holographic device (4) comprises the steps of: forming a heterogeneous support medium (2) having at least two regions (1 ) which are heterogeneous; placing the heterogeneous support medium under recording conditions, e.g. in a liquid X, which are selected to change one or more physical properties of the heterogeneous support medium, wherein the extent or nature of the change in the physical property or physical properties is different in at least two of the heterogeneous regions; recording a holographic image in the heterogeneous support medium while it is under recording conditions; and removing the heterogeneous support medium from recording conditions. Such a device can be used for security and authentication.
Abstract:
The present invention is directed to methods for creating pseudo-holographic images viewable under different selected angles on optical storage devices and other photosensitive surfaces. The present invention also discloses novel optical storage devices with superimposed pseudo-holographic images. Generally, a photosensitive surface is exposed with multiple diffraction patterns creating super-imposed pseudo-holographic images. These diffraction patterns create super-imposed images on the photosensitive surfaces, which can be read by either a human or a computer.
Abstract:
The invention discloses a diffractive device and a method of creating the same displaying a three-dimensional preferably achromatic image, especially imitating a real or an imaginary relief scene, a flat microrelief or otherwise modulated structure (10) of a diffractive type is created, the structure (10) comprising system of diffraction zones (5) which are arranged so that in places of diffractive structure (10) corresponding to places of the relief scene (11) the diffraction zones (5) have such periodicity and orientation (a, b) that cause deflection of incident light (9) in the same direction as the relief scene (11) deflects an incident light, thus achieving a visible thee-dimensional and largely achromatic sensation of image, corresponding to the relief scene (11), when observing the diffractive structure (10) regardless of conditions of lighting.
Abstract:
This invention relates to an optical device and system for producing a holographic optical element or digital hologram. Various techniques of producing digital holograms have been proposed. However, they tend to suffer from long exposure times, as well as problems associated with control of two or more independent beams of coherent light used to produce a hologram. Problems become even more acute as pixel size decreases. The present invention provides an optical device including: a beam deflector (30), adapted to deflect a focussed or collimated beam of coherent light to produce an incident beam; a beam splitter (50) for producing first (12) and second beams (12b), said beams being displaced so that the angle of deflection of the first beam is the same but opposite to the angle of deflection of the second beam; and a beam combiner (55) that recombines the first and second beams so as to produce an interference pattern at an output plane (500). Another embodiment employs a mask aperture that forms a shaped pixel and an image reduction system.
Abstract:
Apparatus for producing dot matrix holograms through laser ablation utilizing only two two-axis, low-inertia beam deflectors to control the maximum holographic direction, and the holographic coloration of the individual pixels of the holograms, and the method of utilizing that apparatus.
Abstract:
A pixellated diffractive device includes a multiplicity of pixels (12, 22) in turn divided into multiple sub-pixels (13, 23). The device is related to one or more pixellated diffraction surface structures which when illuminated generate respective corresponding optically variable images. The sub-pixels (13, 23) of each pixel of the diffractive device include diffractive elements (13a, 23a) arranged in one or more groups, the diffractive elements of each group matching diffractive elements of a corresponding single pixel of the respective pixellated diffraction surface structures. In each pixel of the device the diffractive elements (13a, 23a) of the or each said group are intermixed with other sub-pixels and cooperatively contribute a single element of the corresponding optically variable image which is generated on illumination of the diffractive.
Abstract:
An enhanced optical interference pattern, such as a diffraction grating, is incorporated into a photodefinable surface by shining three or more beams of coherent light from a single source at a photodefinable surface, such as a photosensitive emulsion/photoresist covered glass or an ablatable substrate and mapping the diffraction grating pattern to the photodefinable surface. Mapping of the optical interference pattern is created by interference of three or more light beams, such as laser light or other light sources producing a suitable spectrum of light. The mapped photodefinable surface can be used to create embossing shims. The embossing shim can then be used to emboss film or paper. The embossed film/paper can be metalized and laminated onto a substrate to create a product that has shifting patterns at a variety of viewing angles when exposed to white light.