| 摘要 |
The present invention provides a magnetic-field discharge lamp having an improved overall efficiency of the lamp achieved by enhancing the coupling efficiency between the excitation coil and the bulb, and a lighting apparatus using the same. In specific, the invention is a magnetic field discharge lamp wherein discharge substances are sealed in a light-permeable bulb and a discharge is induced in the bulb by the high-frequency excitation coil provided to surround the bulb. The excitation coil is made of a flat ring plate of at least one coiling around the coil axis, and the flat ring plate satisfies the relationship, 0.06 ? W/dl ? 0.5 where dl represents the inner diameter of the ring plate and W represents the significant width of the passage for allowing current to flow in the circumferential direction.
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