Image registration system using an image converter tube

Claim 1

IN AN OPTICAL CHARACTER READING MACHINE FOR CHARACTERS ON A CONTRASTING BACKGROUND, AN IMAGE CONVERTER TUBE HAVING A PHOTOSENSITIVE EMISSIVE SURFACE, MEANS TO FORM A FIRST IMAGE OF ONE OF SAID CHARACTERS ON SAID SURFACE, SAID TUBE HAVING A SECOND SURFACE AND MEANS RESPONSIVE TO THE EMISSIONS FROM SAID PHOTOSENSITIVE SURFACE TO FORM A SECOND IMAGE OF SAID CHARACTER ON SAID SECOND SURFACE, SAID READING MACHINE INCLUDING MEANS FOR EXAMINING THE CHARACTER WHOSE IMAGE APPEARS ON SAID SECOND SURFACE, OPTICAL MEANS IN OPTICAL ALIGNMENT WITH SAID SECOND SURFACE AND SAID EXAMINING MEANS TO FORM AN IMAGE OF THE LAST MENTIONED CHARACTER ON SAID EXAMINING MEANS FOR EXAMINING BY THE LATTER, SAID IMAGE CONVERTER TUBE HAVING VERTICAL DEFLECTION MEANS TO VERTICALLY MOVE THE IMAGE APPEARING ON SAID SECOND SURFACE, MEANS INCLUDING A VERTICAL DEFLECTION DRIVING CIRCUIT CONNECTED TO SAID DEFLECTION MEANS TO DRIVE SAID VERTICAL DEFLECTION MEANS AND THEREBY VERTICALLY MOVE SAID SECOND IMAGE, SAID TUBE HAVING A POWER INPUT TERMINAL, A POWER SUPPLY CONNECTED TO SAID TERMINAL, MEANS FOR CONTROLLING THE GAIN OF SAID POWER SUPPLY TO THEREBY REGULATE THE INTENSITY OF SAID SECOND IMAGE, PHOTOSENSITIVE MEANS EXPOSED TO SAID SECOND SURFACE AND ARRANGED TO PROVIDE A SIGNAL CORRESPONDING TO THE LIGHT INTENSITY OF SAID SECOND SURFACE ON WHICH SAID SECOND IMAGE APPEARS, AND MEANS FOR CONDUCTING SAID SIGNAL TO SAID GAIN CONTROLLING MEANS TO CONTROL THE LATTER.