| 摘要 |
PURPOSE:To reduce a Joule loss from a current through a mesh, by forming a metallic thin plate bored in a mesh form to screen microwaves and transmit light, arranged in front of the whole opening of a microwave hollow. CONSTITUTION:Microwaves from a magnetron are lead in from a power feeding inlet 5 through a waveguide 3 into a microwave hollow 4 consisting of a hollow wall 41 in a rotating symmetry, to make a non-electrode discharge lamp 6 arranged in the hollow 4 radiate. In this case, an opening is furnished at the hollow 4, and covered with a mesh member 9 to screen microwaves and transmit light, which is formed of a metallic foil bored in a mesh form. And, an electrical contact resistance at the crossings of a mesh such as a net of wire elements is removed to reduce the loss of the surface current of microwaves. Therefore, the efficiency to convert the microwave energy to a discharge of the discharge lamp 6 can be improved. |
