Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-07-25
1998-07-07
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359636, 359834, G02B 2714, G02B 504
Patent
active
057777969
ABSTRACT:
An optical engine for combining or splitting color light beams, compatible with modern high-speed projection systems, is described. The invention utilizes a unique pentaprism core element, partially bounded by five faces, two each on either side of a plane of bilateral symmetry and one opposite, bisected by the plane of bilateral symmetry. Two of the faces of the pentaprism are coated with dichroic films. Functioning as a light combiner, the pentaprism uses these dichroic surfaces and its geometry to interact with incoming tri-color light beams which, after first passing through appropriately modulated light valves, are selectively transmitted and reflected such that all beams exit, axially aligned, from one side of the pentaprism. Functioning as a light splitter, the pentaprism uses the dichroic surfaces and its geometry to split a white light beam into its component primary colors and pass these colors out of the pentaprism. Turning mirrors are used to direct the tri-color beams into or out of the pentaprism region at the necessary angles for proper operation. The turning mirrors are configured to increase compactness of the optical engine while maintaining nearly equal path lengths for all of the tri-color beams.
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Delta America Ltd.
Epps Georgia Y.
Heid David W.
Lester Evelyn A.
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