Patents by Inventor Wayne Hamlin

Wayne Hamlin 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).

  • Electronic focal plane shutter
    Patent number: 4664494
    Abstract: A photographic shutter includes first and second curtains having opaque portions terminating at first and second edges which are positionable in spaced relation to define an exposure slit. Rollers support the curtains for movement of the slit in a certain path and through an exposure region. Electrical servo motors drive the curtains to control the width of the slit and to move the slit through the exposure region. A digital control circuit develops a command signal for control of movement of the slit through the exposure region. A drive circuit controls the servo motors in accordance with the command signal to obtain a certain velocity of movement of said slit at each position of said slit in said exposure region.
    Type: Grant
    Filed: January 28, 1986
    Date of Patent: May 12, 1987
    Assignee: Recon/Optical, Inc.
    Inventors: John G. Hughes, Thomas R. Hodek, Wayne Hamlin