To provide an electrodeless illumination apparatus provided with a resonator having different kind of aperture ratio parts, capable of restraining interference of peripheral equipment and the electrodeless illumination apparatus caused by leakage of microwave by preventing outward leakage of microwave from the resonator.
The electrodeless illumination apparatus comprises an electrodeless bulb emitting light by turning light emitting material filled inside the bulb into a plasma, and a cylindrical resonator on which a light transmission hole transmitting the light emitted from the electrodeless bulb is formed, housing the electrodeless electric bulb in an inside space, blocking outward emission of microwave which is generated at a microwave generating part and impressed on the inside space. In order to relatively reduce leakage amount of microwave, a low aperture ratio part having low aperture ratio is formed on a prescribed area on the resonator along circumferential direction thereof, and in order to increase transmission amount of the light emitted from the electrodeless bulb transmitted to outside of the resonator, a high aperture ratio part having an aperture ratio relatively higher than that of the low aperture ratio part is formed on a residual area on the resonator along circumferential direction thereof.
Jun Tsuruta
Tetsuro Shimada
Koichi Itsubo
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