| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp capable of protecting an exhaust pipe and a bobbin. SOLUTION: The electrodeless discharge lamp comprises a bulb 10 made of translucent material having a hollow part 11 of bottomed cylindrical shape along one axis in which a discharge gas is filled; an exhaust pipe 12 evacuating the bulb 10, communicating with the bulb at the bottom pare 11a of the hollow part 11, arranged at the hollow part 11 along the one axis; a base 13 of which one part has a gap 14 between the peripheral part of the opening part 11b of the hollow part 11 and itself, and the other part supports and fixes the bulb 10; a coil 21 generating a high frequency electromagnetic field in the bulb 10 by being supplied with electrical current and exciting the discharge gas; and a bobbin 20 comprising a cylindrical main part 201 making the coil 21 contact the outer periphery, an annular flange part 202 provided at one end of the outer periphery, and a projection part 203 of cylindrical shape protruding from the flange part 202 in the axial direction of the main part 201 with a length longer than the gap 14, freely inserted into and taken out from the hollow part 11 so as to allow the exhaust pipe 12 come in and out inside the main part 201. COPYRIGHT: (C)2006,JPO&NCIPI
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