Charge storage tube and target electrode therefor

Claim 1

A CHARGE STORAGE CAMERA TUBE COMPRISING: AN ENCLOSING ENVELOPE; PHOTOCATHODE MEANS IN SAID ENVELOPE FOR FORMING AN EXTENDED AREA ELECTRON IMAGE RESPONSIVE TO AN INPUT OPTICAL IMAGE; A PERFORATE TARGET ELECTRODE COMPRISING A FINE MESH SELF-SUPPORTING SCREEN FORMED OF SECONDARY-EMISSIVE DIELECTRIC MATERIAL IN SAID ENVELOPE HAVING ONE SIDE FACING SAID ELECTRON IMAGE FORMING MEANS, MEANS INCLUDING A FINE MESH METAL SCREEN CLOSELY SPACED FROM THE OTHER SIDE OF SAID DIELECTRIC SCREEN AND MEANS APPLYING A POTENTIAL BETWEEN SAID METAL SCREEN AND PHOTOCATHODE TO CAUSE SAID ELECTRON IMAGE TO IMPINGE ON SAID ONE SIDE; MEANS INCLUDING A SECONDARY-EMISSION COLLECTOR ELECTRODE IN SAID ENVELOPE BETWEEN SAID ONE SIDE OF SAID DIELECTRIC SCREEN AND SAID ELECTRON IMAGE FORMING MEANS AND MEANS APPLYING A POTENTIAL TO SAID COLLECTOR ELECTRODE TO ATTRACT SAID SECONDARY ELECTRONS EMITTED FROM SAID DIELECTRIC SCREEN WHEREBY A CHARGE PATTERN CORRESPONDING TO SAID ELECTRON IMAGE IS FORMED ON SAID ONE SIDE OF SAID DIELECTRIC SCREEN; AND MEANS FOR DIRECTING A LOW VELOCITY ELECTRON BEAM TOWARD SAID TARGET ELECTRODE WHEREBY A PART OF SAID BEAM PASSES THROUGH SAID DIELECTRIC SCREEN AND THE REMAINDER IS RELFECTED THEREFROM RESPONSIVE TO THE ELEMENTAL CHARGES THEREON TO THEREBY READ-OUT SAID CHARGE PATTERN.