| 摘要 |
<p>A high pressure discharge lamp (1) includes: a quartz glass bulb (2) having an expanded portion (21) and sealing portions (22), conductive elements (5,5'), and a pair of electrodes (3,4). The conductive elements (5,5') are sealed at the sealing portions (22) of the quartz glass bulb (2). Each electrode (3,4) is disposed so as to be opposite the other and connected to one of the conductive elements (5,5'). The lamp (1) is characterized in that Dp (the distance between an end of each electrode) is in the range between 1.0 and 1.6 mm, S (the longest length of the expanded portion in the direction of a discharge path) = e x Di (wherein 0.8 </= e < 1.0), Di (the largest inside diameter of the expanded portion transverse to the discharge path) = g x Dp (wherein 4 </= g </= 8), and Do (the largest outside diameter of the expanded portion transverse to the discharge path) >/= Di + 4. <IMAGE></p> |
