| 摘要 |
PURPOSE:To minimize the luminous intensity reduction and the luminous nonuniformity of the electrodeless lamp installed in a microwave cavity resonator by locating the antenna of the magnetron used as an output terminal for microwaves in the cavity resonator. CONSTITUTION:The antenna 16 of a magnetron 11 is directly placed in a cavity resonator 18 through a hole 22 formed in the base 18a of the cavity resonator 18. Microwaves radially discharged from the antenna 16 are directly applied to an electrodeless lamp 23 to produce plasma in an emitter tube 24 in the electrodeless lamp 23. As the electrodeless lamp 23 is located in the focus of the cavity resonator 18, light reflected by its light-reflecting surface 20 is raliably introduced toward an opening 19 thereby efficiently drawing light out from the cavity resonator 18. By thus discharging the microwaves into the cavity resonator 18 without causing them to pass through a waveguide or a similar part, the attenuation and reflection of the microwaves are prevented. Consequently, it is possible to minimize the luminous intensity and the luminous nonuniformity of the electrodeless lamp 23. |
