| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a xenon mercury discharge lamp equipped with a structure for promptly restoring to a rated lighting illuminance when switched over from a lighting state of non-irradiation to inputting at a rated lighting when used at full-standby lighting. <P>SOLUTION: In the xenon mercury discharge lamp, a discharging vessel is made of a light emitting part of a swollen shape and two sealing parts and the maximum diameter part of the light emitting part is on a positive electrode side than the center of the light emitting part, and a diameter is reduced as it goes from the maximum diameter part toward the two sealing parts. When viewed at a cross-section along an electrode axis, a length A of a line segment connecting a point where a virtual line drawn perpendicularly to the electrode axis through a tip end of a negative electrode crosses an inner wall of the light emitting part with a tip end center of the negative electrode is shorter than a length B of a line segment connecting a point where a virtual line perpendicular to the electrode axis through a tip end of the positive electrode crosses the inner wall of the light emitting part with a tip end center of the positive electrode, and A<B. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
