公开(公告)号：JPH08124476A

公开(公告)日：1996-05-17

申请号：JP2486595

申请日：1995-02-14

Applicant: SAMSUNG ELECTRONIC DEVICES

Inventor： SHIYU KEIKUSU ,  SAI SHIYOUSHIYO ,  KIN KONBAI ,  RI MITSUTOSHI ,  SAI KISHIYAKU

IPC: H01J1/14 ,  H01J1/142 ,  H01J1/20 ,  H01J1/28

Abstract: PURPOSE: To provide a negative electrode for an electron tube which improves significantly shortening the life, which is a problem with existing oxide negative electrodes and, at the same time, can be manufactured by a method which is 100% compatible with a manufacturing process of the existing negative electrodes. CONSTITUTION: In a negative electrode for an electron tube wherein an electron emitting material layer 1 is formed on a metallic substrate 2 made of nickel as a principal component, the electron emitting layer 1 contains: a metallic oxide of alkaline earth which is obtained from the dissociation of a carbonate of alkaline earth metal containing barium as a principal component; and a La compound and a Mg compound, or a La-Mg compound. With this configuration, a manufacturing process of the electrode so described is 100% compatible with those for existing electrodes and further the life of the electrode is improved by over 15 to 20% from those of conventional oxide electrodes.