Abstract:
A multiple scanning head fascimile system is disclosed in which a plurality of collinear sense heads, attached to a rotating member, scan a document line by line. Logic circuitry, containing temporary storage of the detection of information by each sense head, enables blank spaces and/or blank lines to be skipped, thereby producing an output signal bearing only information. The printer mechanism comprising a plurality of printer heads, decodes the output signal to actuate the printer head corresponding to the sense head selected by the logic circuitry.
Abstract:
Superimposed angularly oriented diffraction gratings are recorded on sheets of magnetic film to provide high-density data storage on each sheet, each recorded grating representing a particular binary digit. Optical readout is accomplished by diffracting a beam of monochromatic light with the gratings on any selected sheet to produce first order diffraction images in the form of spots on an output plane according to the binary digits recorded on the sheet. The locations of the spots thus formed on the output plane are indicative of data recorded on the sheet. The sheets may be stacked to provide compact, threedimensional storage of data.