Storage tube target structure having attached shield ring

Claim 1

A DISPLAY STORAGE TUBE COMPRISING: (A) A CHARGE STORAGE TARGET STRUCTURE, SAID STRUCTURE INCLUDING A TARGET SUPPORT RING HAVING AN INTURNED ANNULAR SUPPORT FLANGE WITH AN INNER EDGE, AND AN APERTURED STORAGE MEMBER HAVING ONE FACE FIXED TO ONE FACE OF SAID FLANGE, (B) MEANS FOR PRODUCING A WRITING BEAM OF ELECTRONS DIRECTED TOWARDS SAID ONE FACE OF SAID STORAGE MEMBER, (C) MEANS FOR SCANNING SAID WRITING BEAM ACROSS SAID ONE FACE FOR CHARGING THE SAME, (D) A PHOSPHOR SCREEN CLOSELY SPACED FROM THE OPPOSITE FACE OF SAID STORAGE MEMBER, (E) MEANS FOR DIRECTING A VIEWING BEAM TOWARDS SAID ONE FACE OF SAID STORAGE MEMBER, WHEREBY ELECTRONS OF SAID VIEWING BEAM SELECTIVELY PASS THROUGH THE APERTURES IN SAID STORAGE MEMBER AND IMPINGE UPON SAID SCREEN FOR PRODUCING A VISIBLE DISPLAY THEREON, AND (F) A CONDUCTING RING FIXED TO THE OTHER FACE OF SAID FLANGE AND HAVING A LIP EXTENDING OVER SAID EDGE, SAID RING EXTENDING OVER AN ANNULAR PORTION OF SAID APERTURED STORAGE MEMBER ADJACENT TO SAID EDGE, WHEREBY SAID EDGE AND SAID ANNULAR PORTION ARE SHIELDED FROM THE VIEWING BEAM AND FAILURE TO COAT SAID ANNULAR PORTION WITH INSULATING CHARGE-HOLDING MATERIAL AND FAILURE TO LEAVE SAID EDGE UNCOATED ARE FREE FROM HARMFUL EFFECTS UPON THE OPERATION OF SAID TUBE.