| 摘要 |
PROBLEM TO BE SOLVED: To provide an infrared light source for an analysis device such as an infrared spectrophotometer having large light emission power, less unevenness in strength distribution and a long service life. SOLUTION: This infrared light source 10 comprises two silicon nitride sintered bodies of plate shape sandwiching a heating conductor 12. A silicon oxide film is previously formed on the surface of each silicon nitride sintered body so as to be uninfluenced by the gradual formation of an oxide film on the surface caused by heating when lighted. When an electric current is fed to a lead wire 13 from the outside, heat is generated at the comb-like bent part of the heating conductor 12 to emit infrared rays. Since a light emission part is formed in a plane area, uniform light emission can be obtained, and since material is stable, service life is long even under high temperature.
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