Patents by Inventor Johannes J. Baalbergen

Johannes J. Baalbergen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical transmissive component with anti-reflection gratings
    Patent number: 5694247
    Abstract: An optical transmissive component (1) is described, which component has an entrance surface (4) and an exit surface (5) for optical radiation (20), in which one of the surfaces (4; 5) is provided with an anti-reflection grating (10; 15). By providing a second surface, (5; 4) with a second anti-reflection grating and by ensuring that the grating strips (11) of the first grating (10) extend essentially perpendicularly to those (16) of the second grating (15) in corresponding areas of the first and the second surface (4; 5), it is prevented that the component is birefringent.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: December 2, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Willem G. Ophey, Johannes J. Baalbergen, Johannes M. Oomen, Petrus G. J. M. Nuyens
  • Optical scanning device including mirror objective having two windows at least one having an aspherical surface
    Patent number: 5029255
    Abstract: An optical scanning device is described with a mirror-objective (30) arranged between a radiation source (40) and an object (10) to be scanned, which mirror objective comprises two radiation windows (31, 34) and two reflectors (32, 33). By giving one of the windows (31, 34) an aspherical shape, the mirror objective is well corrected for spherical aberrations, while no stringent requirements need to be imposed on the accuracy of the shape of the aspherical surface (35).
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: July 2, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Willem G. Opheij, Josephus J. M. Braat, Johannes J. Baalbergen, Alexius J. T. Van Sambeeck