Electronoptical apparatus for analysing documents

An electronoptical analysis apparatus for point to point analysing documents comprising:

• --a fixed cylindrical sector of transparent material having an outer surface in contact with the document to be analyzed, and an inner surface
• --a chassis including:
• an optical device, a main and an additional photoelement fixed on a common support, and illuminating means,
• --means for imparting a step-by-step movement to said chassis in a direction parallel to the axis of said cylindrical sector,
• --an additional cylindrical sector fixed to said chassis and concentric with said fixed cylindrical sector, but slightly smaller in radius so that it slides inside and very close to said fixed sector,
• said optical device comprising a mirror rotating about an axis coinciding with said cylindrical sector axis and one focusing system lens having an axis which encounters on one side said sector axis and on the other side said support, said illuminating means illuminating said mirror along an axis sufficiently parallel to said focusing lens system axis such that successively scanned points are illuminated at the same time that they are analyzed by said main photoelement, the height of said additional sector having the value required to place on said inner surface of said additional sector along a line defined by a plane perpendicular to the axis of additional sector a pattern formed by a series of black and white dashes, and said additional photoelement being capable of receiving the image of a dash of said pattern through said mirror.