CONTROLLED DOCUMENT PHOTOGRAPHIC RECORDING SYSTEM

摘要

A recording system for making photographic microcopies of documents in which control documents interspersed therewith have particular preselected code markings for the control of the transport-photographing system. The control documents give a unique response to specialized illumination directed upon the path of the documents through the system. This response is discerned by sensors and introduced to electronic logic which produces signals for the control of the system in handling and photographing the documents. A "clock" marking is positioned at an extremity of the control document, and unless a signal from this mark is present the logic will not give an output. A differential comparison may be made to prevent spurious responses.