A flying-spot film scanner for colour television

Film moving with uniform velocity is scanned by a series of displaced rasters in such sequence that the system is applicable to 50 or 60 c/s conditions. Three photo-multipliers provide colour analysis of the image, element by element, and directly produce a video-frequency signal, so avoiding any necessity for accurate optical registration. A particular equipment is described. The choice of RGB co-ordinates is examined, and arrangements are discussed to minimize colour flicker, to provide uniform field illumination and to offer the most accurate picture reproduction.