Optics: image projectors – Plural
Reexamination Certificate
2006-08-15
2006-08-15
Dowling, William C. (Department: 2851)
Optics: image projectors
Plural
C353S081000, C362S234000, C362S236000
Reexamination Certificate
active
07090357
ABSTRACT:
High pressure mercury arc lamps are commonly used as the illumination source in many projection systems. Such lamps may be deficient in either output power or spectrum, and so it is desirable to combine the light from the lamp with light from a second light generator. The second light generator may be another mercury lamp or a solid state source, such as one or more light emitting diodes. Different ways of combining light from two light generators are described. The second light source may be an arrangement of a number of red LEDs that supplements the red light produced by the mercury light. A tunnel integrator may be used to homogenize the combined light beam and to reduce the angular separation between the light beams from the two light generators.
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