| 摘要 |
本发明提供一种放电灯，可增加从放电灯的长边方向端部照射的光量。放电灯包括：放电管2；一对电极31、电极32，沿着放电管2的长边方向而设置；反射膜4，沿着放电管2的长边方向在放电管2上具有开口部5而设置；及端部发光区域，在放电管2的至少一个端部，以夹着比反射膜4的长边方向端部更外侧的区域的方式配置着一对电极31、电极32，藉此形成于比反射膜4的长边方向端部更外侧处，且放电管2的长边方向上的端部发光区域所处的区域的至少一部分的工件方向的透光区域Rx，宽于放电管2的长边方向部的工件方向的透光区域。; a pair of electrodes 31 and 32 disposed along a longitudinal direction of the discharging pipe 2; a reflective film 4 disposed to have an opening 5 along the longitudinal direction of the discharging pipe 2; and an end light emitting area configured to be at at leat one end of the discharging pipe 2 and disposed with the pair of electrodes 31 and 32 for clamping an area further outside than a longitudinal direction of the reflective film 4, so that the end light emitting area is formed at further outside than the longitudinal direction of the reflective film 4. Moreover, a light transmitting area Rx in a work piece direction in at least a part of an area where the end light emitting area in the longitudinal direction of the discharging pipe 2 exists is wider than a light transmitting area in a work piece direction at a central portion of the longitudinal direction of the discharging pipe 2. |
