Optics: image projectors – Reflector
Reexamination Certificate
2006-12-26
2006-12-26
Dowling, William C. (Department: 2851)
Optics: image projectors
Reflector
C353S102000, C349S005000, C362S559000, C385S901000
Reexamination Certificate
active
07152981
ABSTRACT:
A projector illumination system includes a tunnel integrator incorporated with a field lens at its output end. One advantage of using the field lens is to form an image of the entrance end of the tunnel integrator at the secondary stop of the illumination system when combined with other relay and/or imager field lenses in the illumination system. This reduces vignetting, resulting in an increased uniformity of illumination, and increased light throughput.
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3M Innovative Properties Company
Dowling William C.
Jonas George W.
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