F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
240/147
F21V 7/00 (2006.01) G02B 19/00 (2006.01)
Patent
CA 1204418
-16- ILLUMINATION SYSTEM Abstract of the Disclosure A system is provided for the sensing of docu- ments, which system includes an arrangement of reflec- tive elements capable of directing illumination onto the object to be sensed in such a manner that the flux density of the illumination is greater adjacent to the boundaries of said object than in the middle portion thereof. This compensates for the vignetting effect found in lenses. A source of illumination is positioned on a first focal line of a cylindrical elliptical mir- ror, with the object to be illuminated being positioned at the second focal line. First additional mirrors forming end pieces for the elliptical mirror, and second additional mirrors located adjacent to the boundaries of the object to be sensed, cooperate to direct light from the source to the object in such a way as to achieve the desired distribution of illumination across the object. Several different embodiments of the cylindrical ellip- tical mirror are disclosed.
431988
Ncr Canada Ltd - Ncr Canada Ltee
Ncr Canada Ltd. - Ncr Canada Ltee
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