Optical: systems and elements – Deflection using a moving element – Pivotal or rotational element
Reexamination Certificate
2006-05-09
2006-05-09
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Deflection using a moving element
Pivotal or rotational element
C359S237000, C359S251000
Reexamination Certificate
active
07042610
ABSTRACT:
Optical components are louvered with a light absorptive material that absorbs stray light rays. The louvers are constructed, for example, using a “black” thin film coating between sheets of glass. The louvered components are placed in an optical path at one or more orientations. In one embodiment, a vertically oriented louvered component and a horizontally oriented louvered component are individually located in a light path to reduce and/or eliminate stray light having either horizontal and/or vertical vector components. Compensated higher order waveplates are constructed from birefringent material by placing two higher order waveplates (a nλ waveplate and a (n+Δ)λ waveplate.) in proximity to each other such that their principle retardation axes are perpendicular. In one embodiment, the higher order waveplates include louvers for stray light suppression.
REFERENCES:
patent: 3527522 (1970-09-01), Baumgartner
patent: 5504629 (1996-04-01), Lim
patent: 2004/0165247 (2004-08-01), Berman et al.
patent: 2004/0169826 (2004-09-01), Segler et al.
Carpenter John
LightMaster Systems, Inc.
Reed Smith LLP
Thompson Timothy
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