| 摘要 |
<p>A metal halide lamp includes a translucent air tight vessel (1) having a light emitting tube portion (11), in which a discharge space (13) is formed, and sealing portions (121,122) formed on both sides of the light emitting tube portion (11). A discharge medium is enclosed in the discharge space (13) containing at least metal halide and rare gas. A pair of electrodes (31,32), one end of which are sealed at sealing portion (121,122) and the other end of which are arranged in the discharge space (13) facing to each other. The discharge space (13) has a nearly circular shape in a cross section perpendicular to the tube axis and has a structure in which the discharge medium (14) is accumulated between the pair of electrodes (31,32). The light emitting tube portion (11) is so formed as the wall thickness of a lower portion is thinner than that of an upper portion. The metal halide lamp is obtained having a high luminous efficiency, a quick rise of light flux and an easy manufacturing ability without less bad influence on lamp characteristics.</p> |
