| 摘要 |
A high-pressure metal vapor arc lamp, lit by direct current power supply, which includes an arc tube in which an anode and a cathode are arranged opposite to one another. The cathode includes a cathode shaft and a coil element wound around the cathode shaft. A diameter of a wire of the coil element is fixed within specific values in connection with a diameter of the cathode shaft, a pitch of the coil is fixed in connection with a diameter of the wire of the coil and IL (discharge current)/d02 (external diameter of the coil) is determined within specific values, whereby an arc spot can be easily moved to the top portion of the cathode even if the arc spot is generated at the base portion of the cathode.
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