Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2005-12-27
2005-12-27
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S722000, C359S723000
Reexamination Certificate
active
06980377
ABSTRACT:
Methods and apparatus are provided for chromatic vignetting in lens systems. The apparatus includes a projection lens unit having an aperture stop, and a selective filter positioned at the aperture stop. The aperture stop defines a ray bundle boundary of an image passing therethrough. The selective filter includes a transmission area having an optical perimeter based on the ray bundle boundary, and a wavelength band filter partially extending from the optical perimeter into the transmission area. The projection lens unit may be used with an illumination unit having a light source and optics conditioning the light from the light source prior to illumination of a light valve. The selective filter may optionally be positioned at a conjugate plane to the aperture stop in the illumination unit. The method includes passing ray bundles through a lens system having an aperture stop, and selectively filtering one of at least one wavelength band at a boundary of the ray bundles at the aperture stop and at least one wavelength band at a boundary of the ray bundles at a conjugate plane.
Dubin Matthew B.
Larson Brent D.
Abeyta Andrew A.
Honeywell International , Inc.
Spector David N.
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