Cathode ray tube image matching apparatus

Claim 1

AN ELECTRONIC TUBE MEANS FOR CORRELATING TWO INFORMATION DISPLAYS IN THE FORM OF LIGHT IMAGES A AND B HAVING A PHOTO-EMISSION CATHODE TO RECEIVE THE LIGHT IMAGES, AN ELECTRON STORAGE GRID MEANS SPACED IN SUBSTANTIALLY PARALLEL RELATION FROM THE CATHODE TO ACCUMULATE THE ELECTRONS EMITTED FROM THE CATHODE IN RESPONSE TO REFERENCE LIGHT IMAGE. A, A VIEWING SCREEN FOR RECEIVING ELECTRONS PASSED THROUGH THE STORAGE GRID AND TO PRODUCE READOUT INFORMATION WHICH IS A FUNCTION OF THE NUMBER OF RECEIVED ELECTRONS, A MAGNETIC YOKE SURROUNDING THE TUBE MEANS FOR ACCELERATING AND FOCUSING THE ELECTRONS EMITTED FROM THE CATHODE TOWARD AND ON THE STORAGE GRID MEANS, SEPARATE MAGNETIC YOKE MEANS SURROUNDING THE TUBE MEANS FOR DEFLECTING THE ELECTRONS EMITTED FROM THE CATHODE IN RESPONSE TO ACTIVE LIGHT IMAGE B TO PROVIDE RELATIVE MOVEMENT ON THE STORAGE GRID BETWEEN THE STORED ELECTRON PATTERN OF IMAGE A AND THE ELECTRON PATTERN OF IMAGE B, WHEREBY THE NUMBER OF ELECTRONS PASSED THROUGH THE STORAGE GRID MEANS AND STRIKING THE VIEWING SCREEN BEING A FUNCTION OF THE CORRELATION BETWEEN IMAGE A AND B, AND MEANS TO MEASURE THE READ-OUT INFORMATION ON THE VIEWING SCREEN.