Ribbon Light Modulator Patents (Class 369/104)
  • Patent number: 4651313
    Abstract: A system and a method for applying a sound track to cinematic film by means of a modulated laser beam.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: March 17, 1987
    Inventor: Moshe Guez
  • Patent number: 4596008
    Abstract: The locally averaged or approximate D.C. value of a variable area optical sound track on a film is first determined, and this information is then used to control the width of a scanning slit at a playback station. The scanning slit width is reduced for small signals and increased for large signals, thereby reducing the amount of non-information bearing area on the film which is included in the scanned area. This in turn reduces the amount of noise from dirt and debris in the non-information bearing area, and by reducing the total amount of light transmitted through the film also lowers the level of quantum noise from the photodetector employed at the playback station.
    Type: Grant
    Filed: August 25, 1983
    Date of Patent: June 17, 1986
    Inventor: Terry D. Beard