Indirect Illumination Patents (Class 355/119)
  • Toner cartridge
    Patent number: 10416591
    Abstract: In one example, a toner cartridge for a printer includes interconnected interior upper and lower toner supply chambers surrounding an exterior opening defined in part by diverging sidewalls and a sloping ceiling.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: September 17, 2019
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Richard L. Swantner, Robin P. Yergenson, Dean J. Richtsmeier
  • Photographic contact printing device
    Patent number: 5812246
    Abstract: A photographic contact printing device has a point-like light source (17) and two uni-directionally curved parabolically cylindrical mirrors (18, 19) the axis of curvature (22, 23) of which are perpendicular to each other, and one axis (23) being parallel to the exposure plane.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: September 22, 1998
    Assignee: Agfa-Gevaert N.V.
    Inventors: Marc Claes, Lambertus Boons
  • Device for illuminating transparencies
    Patent number: 4415958
    Abstract: A lighting device for uniformly illuminating transparencies. The device comprises an open-ended, rectangular parallelepiped-shaped housing having specularly reflective interior surfaces and a partially reflecting/diffusing opal glass screen positioned over the housing open end. An elongated electronic flash tube is mounted within the housing in a manner whereby a substantially uniform illumination is provided at the exterior surface of the opal glass screen when the flash tube is fired.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: November 15, 1983
    Assignee: Polaroid Corporation
    Inventor: John M. Guerra
  • Method and apparatus for increasing contrast and resolution from low density film
    Patent number: 4035078
    Abstract: Photograph film negatives with specular densities so low that they are not usable with transmitted light, e.g., densities below 0.3, may be used with substantially increased contrast and resolution when illuminated with a beam of light which is scattered by the developed silver grains of the film and viewed against a light absorbing background. Apparatus for practicing this method includes a light table for film readout convertible for conventional film readout; and copy camera-enlargers.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: July 12, 1977
    Inventors: Harry W. Woo, Paul Reichel