Patents Assigned to Ellanin Investments, Ltd.
  • Patent number: 4104680
    Abstract: A method and apparatus for film weave correction is disclosed in connection with a moving beam-type recorder or flying spot scanner device having a continuous-motion film drive in which the film is edge-guided rather than sprocket hole-guided as during playback. The film weave correction apparatus causes the beam to sweep, at least once for each frame being scanned, horizontally across a sprocket hole defined in the film adjacent to the frame. A detector behind the film detects the beams's crossing of the sprocket hole edge. The apparatus compares the time of occurrence of this edge crossing with a reference time and generates therefrom a film weave correction signal. This signal is applied to the horizontal deflection circuitry of the device and causes the beam to be shifted in such a way that the horizontal position of each scanned frame remains constant with respect to the position of the adjacent sprocket hole rather than with respect to the film edge or film guide.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: August 1, 1978
    Assignee: Ellanin Investments, Ltd.
    Inventor: David E. Holland