Optical separating filter

Details Optical separating filter Optical separating filter

2005-06-10

2010-02-23

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Lens or prism separate from projection system

C349S062000, C349S095000

Reexamination Certificate

active

07667785

ABSTRACT:
An optical separating filter separates impinging light into a first and a second part having different properties. The separating filter comprises reflective filters (FR) arranged in funnel shaped structures (F1). Each one of the structures (F1) have an inlet area (IA1) to receive the impinging light (IL) and an outlet area (OA1) smaller than the inlet area. (IA1) to converge reflected impinging light (RL) towards the outlet area (OA1). The structures (F1) comprise a first group of funnel shaped structures (F1) constructed to reflect light which has a first property (C1) towards their respective first outlet areas (OA1) and for transmitting light which has a second property (C2) towards respective second outlet areas (OA2).

REFERENCES:
patent: 5757547 (1998-05-01), Rodman et al.
patent: 6147725 (2000-11-01), Yuuki et al.
patent: 2002/0105710 (2002-08-01), Lee et al.
patent: 2002/0180909 (2002-12-01), Lubart et al.
patent: 2003/0147027 (2003-08-01), Wachi
patent: 2008/0192178 (2008-08-01), Ben-David et al.
Ko et al; “High-Efficiency Micro-Optical Filter for Liquid-Crystal Projection System Applications”; Applied Optics, vol. 39, No. 7, Mar. 1, 2000.

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