Optical: systems and elements – Lens – With multipart element
Reexamination Certificate
2004-05-17
2008-03-11
Schwartz, Jordan (Department: 2873)
Optical: systems and elements
Lens
With multipart element
C359S457000
Reexamination Certificate
active
07342728
ABSTRACT:
The invention relates to a Fresnel lens. Each refractive structure of the lens is bounded by two surfaces, the second surface making a second angle with the normal to the plane of incidence. At least two zones of refractive structures are provided in which the second angle is equal to the entrance angle of a beam. Each first surface refracts the light along a direction parallel or not parallel to the axis of the lens depending on the zone. The invention also relates to a system comprising a folding mirror and a Fresnel lens, in which system the second angle is equal to the entrance angle of a parasitic ray obtained by reflection on the Fresnel lens and then on the mirror. The invention also relates to a corresponding back projection screen and a corresponding back projection unit.
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Search Report Dated Jan. 28, 2005.
Benoit Pascal
Schubert Arno
Fried Harvey D.
Jones James C
Laks Joseph J.
Schwartz Jordan
Thomson Licensing
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