| 摘要 |
PROBLEM TO BE SOLVED: To provide a cathode of discharge tube having a stability in the electric discharging operation, a high rate of light flux maintenance, and a long lifetime. SOLUTION: A discharge tube includes a cathode and anode arranged in an electric discharge vapor and arc discharge is conducted, wherein the cathode 21 is formed by mixing a powder of an electron emissive material with a high melting point metal powder, followed by a compressive press shaping and sintering. The manufacturing process of this cathode comprises a first process as the above-mentioned emissive material mixing process, a second process to make compressive press shaping of the mixture powder, and a third process to sinter the obtained shape by the second process.
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