公开(公告)号：US3570000A

公开(公告)日：1971-03-09

申请号：US3570000D

申请日：1968-06-11

申请人： JAPN RADIO CO LTD

发明人： KOSHIZUKA MICHIO ,  SAITO HIROSHI ,  HATA SHINICHIRO

IPC分类号： H01J17/32 ,  H01J17/49 ,  H01J7/40

CPC分类号： H01J17/32 ,  H01J17/49 ,  H01J2893/0069

摘要： A MINIATURE GAS-FILLED COLD-CATHODE INDICATOR DISPLAY TUBE WHEREIN AN ELCTRICALLY INSULATING OXIDE OF A RADIOACTIVE METAL ISOTOPE HAVING A LONG HALF-LIFE (HAVING A LONG PERIOD OF HALF DAY), SUCH AS THORIUM OXIDE, URANIUM OXIDE OR VANADIUM OXIDE IS PLACED WITHIN THE ENVELOPE OF THE TUBE TO PREVENT THE IONIZATION VOLTAGE FROM INCREASING WHEN HE TUBE IS OPERATED UNDER ADVERSE CONDITIONS.