摘要:
In a method for production of documents with a hologram and a document with a hologram, wherein, in a first step, a hologram is exposed in a photographic film and, in a second step, the photographic film is applied to a document support, the individualisation of the holograms first occurs during the gluing or after the gluing to the printed personal document or to the protective film provided for the surface protection of the document. It is thus possible to produce in a secure and economical fashion documents with individual holographic information of greater visibility and with further novel security features.
摘要:
The invention relates to a security system especially for security documents, wherein a security element is provided in a carrier plane, that under incident light holographically reconstructs a pattern outside the carrier plane, in which concealed information is stored and having a flat transparent verification element which on flat contact with the security element makes the information stored therein visible. The invention further relates to a security element and a verification element for use in the security system and a security document fitted with the security system. The invention additionally relates to an apparatus and a method for reading out the concealed information which is stored holographically in the pattern reconstructed on the security element under incident light.
摘要:
In a method of taking and reproducing photographs in which a hologram in the substrate of the photograph is superposed on the photograph and is produced, e.g., by the Lippmann-Bragg process by an object beam and a reference beam from the same light source, the object beam containing amplitude information corresponding to the photograph in such a manner that a corresponding image is formed at the same time on the substrate which corresponds to the hologram plane, and the aperture stop of image-forming optical system contains the object to be represented by the hologram. An optical phase modulator for producing a predetermined set of phase disturbances is provided between the aperture stop and the hologram plane.
摘要:
A method is indicated for the contactless measurement of the relative movement of an object (14) relative to a scannable pattern (12), a scanning beam (31) being generated which scans a portion of pattern which moves with the object along a scanning path on the pattern in order to produce a scanning signal. In order easily to be able to establish the angle between a reference direction rigid with the object and the direction of movement of the pattern in relation to the object, it is proposed that the scanning beam be displaced parallel with and/or pivoted along a curved guide path rigid with the object, the movement of the scanning beam occurring in accordance with a guide angle function and in that furthermore there is derived from the scanning signal a density signal which indicates the time pattern of the reciprocal value of the time interval between the scanning pulse at any given moment and the preceding scanning pulse, possibly averaged out and in that the phase location of the density signal is determined in relation to the guide angle function. The angle sought corresponds to this phase location.
摘要:
The invention relates to a security system especially for security documents, wherein a security element is provided in a carrier plane, that under incident light holographically reconstructs a pattern outside the carrier plane, in which concealed information is stored and having a flat transparent verification element which on flat contact with the security element makes the information stored therein visible. The invention further relates to a security element and a verification element for use in the security system and a security document fitted with the security system. The invention additionally relates to an apparatus and a method for reading out the concealed information which is stored holographically in the pattern reconstructed on the security element under incident light.
摘要:
The invention relates to a security system especially for security documents, wherein a security element is provided in a carrier plane, that under incident light holographically reconstructs a pattern outside the carrier plane, in which concealed information is stored and having a flat transparent verification element which on flat contact with the security element makes the information stored therein visible. The invention further relates to a security element and a verification element for use in the security system and a security document fitted with the security system. The invention additionally relates to an apparatus and a method for reading out the concealed information which is stored holographically in the pattern reconstructed on the security element under incident light.
摘要:
A method for determining the authenticity of a hologram with the following steps:a) The hologram (1) to be checked is illuminated with a restoration ray (2):b) The diffraction ray (3) of the first order of the wave field created at the hologram is imaged on a first photo-sensitive element, in particular a CCD target (5), and brought to interference with a first reference ray (7);c) The diffraction ray (4) of the zeroth order of the wave field created at the hologram (1) is imaged on a second photo-sensitive element, in particular a CCD target (6) and brought to interference with a second reference ray (10);d) The intensity distributions created at the different photo-sensitive elements (5, 6) are correlated with each other for at least two phase relationships between the restoration ray (2) and the different reference rays (7, 10) to obtain a correlation intensity distribution for the relevant orders of diffraction; ande) The correlation intensity distributions determined for the relevant orders of diffraction are correlated with each other, particularly subtracted from each other pixel by pixel.
摘要:
A description is given of a document with a hologram as a security feature, in particular an identity card (12), consisting of a polycarbonate card body (10), which has a volume hologram label (2, 9) embedded therein. A description is additionally given of a method for producing the document, in which volume hologram labels (2) arranged on a carrier sheet are brought into contact with adhesive regions (4) on a thermoplastic sheet (5.1), the adhesive surfaces are cured and the carrier sheet is then removed. A second plastics sheet (5.2) is then adhesively bonded onto the first plastics sheet (5.1), bearing the hologram labels, using a second adhesive (7) in the region of the hologram labels (2) to form a two-layered sheet composite (6) which, finally, is laminated, together with further thermoplastic sheets, in a card-lamination press, under the action of pressure and temperature, to give a card body (10), individual identity cards (12) being punched out.
摘要:
The invention relates to a security system especially for security documents, wherein a security element is provided in a carrier plane, that under incident light holographically reconstructs a pattern outside the carrier plane, in which concealed information is stored and having a fiat transparent verification element which on fiat contact with the security element makes the information stored therein visible. The invention further relates to a security element and a verification element for use in the security system and a security document fitted with the security system. The invention additionally relates to an apparatus and a method for reading out the concealed information which is stored holographically in the pattern reconstructed on the security element under incident light.
摘要:
A process for the manufacture of non-replicable holograms possessing authenticity features which are copies of a master hologram. To form a master hologram, a hologram is taken of a randomly structured optical element, for example of a ground glass screen or a diffusor. The resulting hologram forms an authenticity feature, with an optical system which leads to a hologram with a pattern of lines that are parallel to one another.