The invention relates to an
electric arc tube of a ceramics
metal halide lamp in the technical field of
electric light source. The invention is designed to aim at the technical problem that the structure design on the existing products needs to be improved. The
electric arc tube is baked and manufactured by taking a high-purity a-Al203 polycrystal semi-transparent
alumina (PCA) ceramics; an
electrode component is inserted into a ceramics discharging cavity by a
tail tube; the clearance between the
electrode component and the
tail tube is sealed by a glass solder. The invention is mainly designed in that the outer
diameter surface of a transition area is vertical to a main tube and the
tail tube; the ceramics discharging cavity of the inner
diameter surface of the transition area is conical;
metal halides, Hg and
cushion gases are filled in the ceramics discharging cavity; a convex-concave area is arranged at the connection location of the inner
diameter surface and the tail tube. The
electric arc tube of a ceramics
metal halide lamp is more reasonable in design, is simple in structure and has the characteristics of higher stability, color rendering, light efficiency, longer service life and
miniaturization, is suitable for being assembled in the body of a jacklight as well as the illumination on the occasions like show windows, marketplaces, car exhibition halls, commercial streets, and the like.