Patents Assigned to Torch Technologies LLC
  • Projector system with hollow light pipe optics
    Patent number: 5902033
    Abstract: A projector system includes a light pipe integrator (LPI) between its lamp and its projection lens system. The LPI is hollow, formed from sheet metal, and has an internal cold mirror coating which reflects visible light and passes infra-red radiation. The reflector is a compound reflector having profiles of two ellipses with different eccentricities.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: May 11, 1999
    Assignee: Torch Technologies LLC
    Inventors: Maurice E. Levis, Helen Gourley
  • LCD projection system with polarization doubler
    Patent number: 5884991
    Abstract: A projector system includes a lamp, a reflector collector optic, a light pipe, a Polarizing Beam Splitter (PBS), and an LCD (Liquid Crystal Display) panel. The light pipe has a square or octagonal entrance pupil, reflecting internal walls coated with a cold mirror coating, is tapered in shape, and has a rectangular exit pupil. The PBS converts an unpolarized beam from the exit pupil of the light pipe into a uni-polarized beam which it directs to the LCD panel.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: March 23, 1999
    Assignee: Torch Technologies LLC
    Inventors: Maurice E. Levis, Helen Gourley