Indexing system for color cathode ray tubes

Claim 1

COLOR TELEVISION IMAGE REPRODUCTION APPARATUS WHICH COMPRISES: A CATHODE RAY TUBE KINESCOPE HAVING A TARGET SCREEN MADE UP OF A PLURALITY OF GROUPS OF VERTICALLY ORIENTED STRIP-LIKE ELEMENTS OF RESPECTIVELY DIFFERENT COLOR LIGHT EMITTING CHARACTERISTICS AND MEANS FOR PRODUCING AND DIRECTING AN ELECTRON BEAM TOWARD SAID SCREEN; DEFLECTION MEANS ASSOCIATED WITH SAID KINESCOPE FOR CAUSING SAID BEAM TO SCAN A RASTER PATTERN ON SAID SCREEN; SAID RASTER COMPRISING A PLURALITY OF HORIZONTAL LINE SCANSIONS SEPARATED VERTICALLY FROM EACH OTHER; MODULATING MEANS COUPLED TO SAID KINESCOPE FOR MODULATING THE INTENSITY OF SAID ELECTRON BEAM SEQUENTIALLY, INTO A TRAIN OF PULSES, WITH VIDEO SIGNALS RESPECTIVELY REPRESENTATIVE OF SAID DIFFERENT COLOR CHARACTERISTICS, SAID TRAIN OIF PULSES BEING DEVELOPED TO HAVE ONE PULSE THEREOF ASSOCIATED WITH EACH OF SAID STRIP-LIKE COLOR EMITTING ELEMENTS; MEANS OPERATIVELY ASSOCIATED WITH SAID KINESCOPE FOR DERIVING A SERIES OF ELECTROMAGNETIC INDEX SIGNALS THEREFROM INDICATIVE OF THE POSITION OF SAID BEAM WITH RESPECT TO SAID SCREEN; MEANS FOR PRODUCING A NUMBER OF DIFFERENTLY TIMED CONTROL PULSES FROM SAID INDEX SIGNALS; MEANS COUPLED BETWEEN SAID LASTNAMED MEANS AND SAID MODULATING MEANS FOR APPLYING SAID CONTROL PULSES TO SAID MODULATING MEANS; SAID KINESCOPE INDEX SIGNAL-DERIVING MEANS, CONTROL PULSE-PRODUCING MEANS, PULSE-APPLYING MEANS, SAID MODULATING MEANS, AND SAID KINESCOPE FORMING A FEEDBACK LOOP HAVING AN INHERENT TIME DELAY; AND DELAY MEANS INTERPOSED IN SERIES IN SAID LOOP, SAID DELAY MEANS HAVING A TIME DELAY APPROXIMATELY EQUAL TO THE TIME REQUIRED FOR SAID BEAM TO MAKE ONE SMALL PART OF A LINE SCANSION MINUS SAID INHERENT TIME DELAY, SAID SMALL PART OF A SCANSION CONSIDERED TO BE IN THE ORDER OF THE WIDTH OF THREE CONSECUTIVE STRIP-LIKE COLOR EMITTING ELEMENTS, WHEREBY THE OVERALL DELAY IN THE FEEDBACK LOOP IS REDUCED TO A MINIMUM.