| 摘要 |
<p>There is provided a discharge lamp in which the state of arc is kept stable and the light emitting intensity of the radiated light can be stabilized after starting the turning-on operation within a short period of time. The discharge lamp of this invention is comprised of a bulb 10 composed of a light emitting tube 11 enclosing a light emitting space S and sealing tube sections 12 jointly arranged at both ends of the light emitting tube; an anode 13 and a cathode 14 oppositely arranged to face each other within the light emitting space S of the bulb 10; and electrode rods 15 having the anode 13 and, respectively, the cathode 14 on their extreme ends to extend from the sealing tube sections 12 of the bulb 10 toward the light emitting tube 11, and mercury is hermetically filled in the light emitting space S of the bulb 10, wherein a thermal conductor plate 30 is arranged at the end part of the cathode 14 in the light emitting space S of the bulb 10 in such a way that it is being contacted with the electrode rod 15 having the cathode 14. In addition, in the discharge lamp of the present invention, it is preferable that the lamp is lit in such a way that the anode 13 is positioned above the cathode 14. <IMAGE></p> |
