Polarizing illumination device and projection display device
Patent 6092901 Issued on July 25, 2000. Estimated Expiration Date: 
December 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPolarization illumination apparatus and projector using the apparatus Polarizing beam splitter and an illuminating device provided with the same Patent #: 5748369 InventorsAssigneeApplicationNo. 203343 filed on 12/02/1998US Classes:362/19, WITH POLARIZER349/66, Louvres349/95, Microlenses353/20, POLARIZER OR INTERFERENCE FILTER353/31, Multicolor picture353/46, IMAGE MOVES ON SCREEN359/483, POLARIZATION WITHOUT MODULATION359/487, By reflection or refraction (e.g., Brewster angle)362/268, Plural serial lens elements or components362/293, Including selected wavelength modifier (e.g., filter)362/331Plural serial refractorsExaminersPrimary: O'Shea, SandraAssistant: DelGizzi, Ronald E. Attorney, Agent or FirmForeign Patent References
International ClassesF21V 009/14G02B 005/30 Foreign Application Priority Data1997-12-17 JPAbstractA polarizing illumination device and a projection display device using the polarizing illumination device improve light utilization efficiency. Polarizing conversion elements are placed so that one of polarizing separation films of a first polarizing conversion element and one of polarizing separation films of a second polarizing conversion element are close to each other and so that effective incident areas and ineffective incident areas are alternately arranged in the x direction. The width WP in the x direction of the effective incident areas and the ineffective incident areas is set to be larger than half of the width WL in the x direction of small lenses in a second lens array. The optical axes of each of small lenses are offset from the lens centers thereof so that partial beams emerging from the small lenses in a first lens array optimally enter the effective incident areas where the partial beams should enter.Field of SearchWITH POLARIZERPlural serial refractors Plural serial lens elements or components Including selected wavelength modifier (e.g., filter) Multicolor picture IMAGE MOVES ON SCREEN POLARIZER OR INTERFERENCE FILTER By reflection or refraction (e.g., Brewster angle) POLARIZATION WITHOUT MODULATION Louvres Microlenses | |
