Picture reproducing system having vertical synchronizing signal generation independent of horizontal scanning frequency

Claim 1

APPARATUS FOR REPRODUCING PICTURE INFORMATION FROM A RECORD MEDIUM COMPRISING, IN COMBINATION: AN ELONGATED, NARROW STRIP OF THIN, TRASPARENT MATERIAL HAVING FORMED THEREON A SEQUENCE OF PICTURE INFORMATION-CONTAINING FRAMES AND A SEQUENCE OF SYNCHRONIZING INDICIA ASSOCIATED WITH SAID FRAMES, RESPECTIVELY; MEANS FOR TRANSPORTING THE STRIP THROUGH A SCANNING ZONE, MEANS FOR INTERROGATING THE FRAMES AND SYNCHRONIZING INDICIA OF THE STRIP IN A SCANNING ZONE INCLUDING A SCANNING BEAM; A HORIZONTAL SCAN SIGNAL GENERATOR PRODUCTIVE OF A PERIODIC WAVEFORM SIGNAL AT A GIVEN FREQUENCY FOR PERIODICALLY SWEEPING THE SCANNING BEAM ACROSS THE RECORD MEDIUM IN THE SCANNING ZONE IN SUCCESSIVE SUBSTANTIALLY SUPERIMPOSED LINE SCANS; AND DETECTOR MEANS RESPONSIVE TO THE INTERROGATING MEANS FOR DEVELOPING (A) A FIRST SIGNAL REPRESENTATIVE OF THE INFORMATION CONTAINED IN THE FRAMES OF THE STRIP AND (B) A VERTICAL SYNCHRONIZING SIGNAL AT A FREQUENCY RELATED TO THE RATE OF MOVEMENT OF THE SYNCHRONIZING INDICIA THROUGH THE SCANNING ZONE BUT INDEPENDENT OF THE GIVEN FREQUENCY OF THE PERIODIC WAVEFORM SIGNAL.