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US 6,280,035 B1Granted
Lens design to eliminate color fringing
AssigneeDuke University
InventorsBiljana Tadic-Galeb, Robert E. Fischer, Neil L. Condra
Life of this patent
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Abstract
Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in displays, such as folded displays that have decreased footprint size, but long effective projection lengths.
Claims37
A projection lens apparatus, comprising:
- a front lens unit;
- a back lens unit optically coupled to said front lens unit;
- a linear reflecting polarizer optically coupled to the front lens unit and the back lens unit that receives illumination light and directs the illumination light to the back lens unit;
- a chromatic separating element optically coupled to the linear reflecting polarizer that separates the illumination light into color separated light;
- an imager optically coupled to the chromatic separating element and adapted to impart an image on a portion of the color separated light;
- and
- a field lens adapted to change the magnification of the portion of the color separated light to substantially correct a chromatic aberration.
4 more elements
Dependencies are inferred from the claim text.