Optics: image projectors – Prism in light path
Reexamination Certificate
2005-04-26
2005-04-26
Dowling, William C. (Department: 2851)
Optics: image projectors
Prism in light path
C353S069000, C385S901000, C359S443000
Reexamination Certificate
active
06883919
ABSTRACT:
An achromatic flat-panel projection display comprises a video projector2a, a condensing lens (26) and a tapered transparent slab spreading the image input from the projector over the area of th slab. To compensate for dispersion in the slab a dispersive prism is used at the input edge of the slab, whose dispersion cancels out the dispersion of the slab. The prism can be a separate part of simply a bevel in the input edge, i.e. the thick end of the slab.
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Cambridge Flat Projection Displays Limited
Dowling William C.
Garvey, Smith, Nehrbass & Doody, L.L.C.
North Brett A.
Smith Gregory C.
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