Abstract: A system for correcting the manufacturing errors and variations in the positional alignment and spacing of optical fibers in the scanning head of an automatic digitizing system. A scan head signature is produced by measuring the actual X and Y position for each optical fiber including the variation of each fiber from its nominal X and Y positions. An X correction circuit and a Y correction circuit use the head signature data stored in a signature correction memory to correct the X and Y positions of the stream of scan line data to thereby provide a true video scan of the document data.

Abstract: Registration is maintained as between an electron beam and that portion of a light-emissive interface selected for visualizing beam-defined characters by providing a discernible indicium on the interface at a location exterior to the selected interface portion and interacting the beam with interface area inclusive of the indicium. Signals are generated by a detector viewing such interface area and information for correction of beam deflection is obtained from the signals.

Abstract: In photocomposition, when change in point size is made, rather than change iris opening, a programmable flash intensity provides the required irradiance. Iris setting is made only to compensate for film or paper sensitivity, flash lamp efficiency, and energy storage capacitor variations.

Abstract: A photographic compositor having a letter pattern carrying section comprising a plurality of letter pattern carrying discs which are rotatably mounted on a common rotatable shaft at intervals. A dynamic optical system provides a collimated light beam source at a fixed location. A carriage with a sub-optical system decollimates and focuses the beam, transports the beam in an offset path to letter pattern of a disc, and recollimates the beam. The recollimated beam is then projected to a focusing lens and out to a photocomposer apparatus.