Siemens Aktiengesellschaft

Erwin Sick Gesellschaft MIT Beschrankter Haftung Optik-elektronik

Angelika Staimer

Erwin Sick

Hartwig E Ruell

Detlev Flothmann

An identification card, which has an increased safeguard against counterfeiting, comprises both a hologram containing information and information which is visible recorded in a single layer of recording material disposed on a substrate. The card is produced by first recording the visible information on a layer and then recording a hologram in a portion of the layer. Since the hologram may include both the visible information of the card and information which is coded to be read only by a machine, the process for evaluating the hologram converts the reconstructed hologram into electrical signals by means of a vidicon. Then the signals, which correspond to the machine-readable coded information, are separated from the other signals and processed separately. A practical apparatus for recording the hologram on the card includes imaging optics for forming a demagnified real image of the overall view of the identification card and mirrors for reflecting the imaging beam path onto the portion of the card as an object wave for recording the hologram.

Identification card with a hologram and a process for the production

Apparatus for combining light emanating from a linear scanning field on a relatively small receiver via an optical arrangement producing a scanning light spot with a light ray scanning device onto which a light beam impinges, the arrangement further having optical elements of the transmitting beam of rays located in front of the light ray scanning device, a transmitting concave mirror and a receiving concave mirror extending in the scanning direction, and a cylindrical lens parallel to the scanning field and extending in the vicinity of the latter, the transmitting and receiving beams of rays being separated by pupil separation. There is further provided plane mirrors arranged between the concave mirrors and light ray scanning device for bending the receiving beam of rays perpendicular to the scanning direction and in the direction of the intersection point of the optical axis of the transmitting beam of rays located on the light ray scanning device by such an amount that it still strikes the light ray scanning device, but passes beside the optical elements. The curved surface of the cylindrical lens is ground planar in the area of the entry of the transmitting beam of rays, and the receiving concave mirror is displaced relative to the transmitting concave mirror in the sense of shortening the optical path of the receiving light.

Growing community of inventors

Munich, Germany

Angelika Staimer