| 摘要 |
PURPOSE:To acquire a uniform light distribution on the exposure ember, by making a longish discharge member to receive microwaves change in size longitudinally. CONSTITUTION:Microwaves generated by a magnetron 5 are radiated into a microwave cavity resonator 3 to form an electromagnetic field. By this electric field, a gas discharge occurs in a non-electrode discharge lamp 11 to heat the wall. Then the light of a luminous spectrum responding the type of metal in the non-electrode discharge lamp 11 is radiated, reflected by a metallic conductor wall 7 of the microwave cavity resonator 3 whose inner wall surface acts as a reflecting plate, and introduced outside through a mesh plate 8. The non- electrode discharge lamp 11 is arranged with small diameter portions 13 and large diameter portions 12 responding to the swelling portions and the joint portions of the specific microwave, that is, the portion of a stronger luminous intensity is in the small diameter portion and the portion of a weaker luminous intensity is in the larger diameter portion. Therefore, the light radiated from the non-electrode discharge lamp 11 is averaged and a uniform luminous distribution is acquired on the exposure member E. |
