Access control system
First Claim
1. Apparatus for reading an identification card of the type that includes (1) visible indicia decriptive of an authorized holder;
- and (2) further visible indicia descriptive of said holder sandwiched between a reflecting medium and a filter which is opaque to visible radiation but substantially transparent to infra-red or ultra violet radiation, said apparatus comprising;
a source of a beam of infra-red or ultra-violet radiation;
means for directing said beam of infra-red or ultra-violet radiation onto the surface of said card and substantially normal thereto, thereby to cause said beam to be reflected off said reflecting medium and to be modulated by the information contained by said further visible indicia; and
means, substantially aligned with the normal to said surface and responsive to said modulated, reflected infra-red or ultra-violet beam, for detecting said further visible indicia.
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Accused Products
Abstract
A photo I.D. card having the photograph, and/or signature, and/or coded indicia of an authorized holder which is visible under ordinary room illumination also carries a second photograph of the user. The second photograph is in the form of a transparency which is sandwiched between a piece of retroreflective material and an optical filter which is opaque to light of normal intensity and wavelength but which is transparent to infra-red or ultra-violet radiation. Also disclosed is apparatus for reading both the visible and invisible photographs, signature, and data on the card by means of a CCTV system. Any attempt to alter or forge the I.D. card can, thus, be readily detected.
53 Citations
7 Claims
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1. Apparatus for reading an identification card of the type that includes (1) visible indicia decriptive of an authorized holder;
- and (2) further visible indicia descriptive of said holder sandwiched between a reflecting medium and a filter which is opaque to visible radiation but substantially transparent to infra-red or ultra violet radiation, said apparatus comprising;
a source of a beam of infra-red or ultra-violet radiation; means for directing said beam of infra-red or ultra-violet radiation onto the surface of said card and substantially normal thereto, thereby to cause said beam to be reflected off said reflecting medium and to be modulated by the information contained by said further visible indicia; and means, substantially aligned with the normal to said surface and responsive to said modulated, reflected infra-red or ultra-violet beam, for detecting said further visible indicia. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- and (2) further visible indicia descriptive of said holder sandwiched between a reflecting medium and a filter which is opaque to visible radiation but substantially transparent to infra-red or ultra violet radiation, said apparatus comprising;
Specification