Patents Assigned to McDonnell Douglas Corporatin
  • Patent number: 5781345
    Abstract: The graded dielectric combiner, such as for a dual heads up display (HUD) combiner, is fabricated by depositing a predetermined number of dielectric layers upon a substrate and by thereafter selectively removing at least some of the dielectric layers from a graded portion of the dielectric combiner. As a result, the number of dielectric layers disposed upon the substrate will vary across the graded portion of the combiner. More specifically, the graded portion of the combiner may include a number of bands. A predetermined percentage of each band includes the predetermined number of dielectric layers, while the remainder of each band includes less than the predetermined number of dielectric layers. Since the dielectric layers are deposited in a conventional fashion, however, the thickness of each remaining dielectric layer will be uniform across the substrate.
    Type: Grant
    Filed: February 11, 1997
    Date of Patent: July 14, 1998
    Assignee: McDonnell Douglas Corporatin
    Inventors: Ronald Alfred Ferrante, Rudolf Herman Ott, Gordon Harold Burkhart