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Device for the contact-based simultaneous capture of prints of autopodia

  • US 10,366,273 B2
  • Filed: 08/30/2018
  • Issued: 07/30/2019
  • Est. Priority Date: 08/31/2017
  • Status: Active Grant
First Claim
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1. A device for the contact-based simultaneous capture of prints of several areas of skin of human autopodia supplied with blood, by means of disturbed total internal reflection, comprising, seen from the direction of an area of skin in contact:

  • a protective body of predefined thickness with a contact surface, wherein the contact surface has a size which makes possible the simultaneous placement of several autopodia;

    a sensor layer, comprising light-sensitive sensor elements, arranged in the form of an array, for detecting light of at least one predefined wavelength range, wherein passband areas which are transparent for light of at least one predefined illumination wavelength range are arranged between the sensor elements;

    a light guide made of a material that is transparent for light of the predefined illumination wavelength range, which is designed in the form of a plane-parallel plate, with a lower large face and an upper large face arranged parallel thereto which faces the sensor layer, as well as several edges connecting the large faces, wherein one of the edges is formed as a coupling-in surface for illumination light,a light source configured to emit illumination light along a longitudinal direction of the coupling-in surface, wherein the light source is designed to emit light in a limited angular range around a preferred direction, and the preferred direction makes an angle of incidence with the large faces and is predefined such that light which is emitted in the angular range would, after entering the light guide, be predominantly totally internally reflected at the large faces in the case of a medium with a refractive index of air in contact therewith;

    a mirror layer arranged between the sensor layer and the light guide, the mirror layer configured to reflect one portion of the illumination light back into the light guide and transmit another portion of the illumination light, and configured to homogenize the illuminance of illumination light which exits the light guide through the upper large face thereof and strikes the contact surface, based on a distance to the light source.

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