| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp capable of obtaining constant light output regardless of a lighting direction. SOLUTION: The electrodeless discharge lamp comprising a bulb 1 equipped with a substantially-spherical spherical portion 1a and a neck portion 1b extending therefrom, a base 15 connected to the neck portion, a protrusion 4 formed at the top of the spherical portion, and an induction coil 11a for causing discharge in the bulb to emit light. Assuming the lamp input power is W (W), the diameter of the spherical portion is D (mm), the diameter of the bonding surface between the neck portion and the base is d (mm), and the distance from the maximum diameter portion of the spherical portion to the bonding surface is A (mm), and when the following expressions are specified; B=W/(4π(D/20)<SP>2</SP>), S=π(d/20)<SP>2</SP>, L=π(d/10), X=(BS)/(LA), the electrodeless discharge lamp satisfies the following expression; t-6≤10,959X+25≤t+6, where t is the temperature (°C) at the tip of the protrusion 4 at the time of downward stable lighting of the electrodeless discharge lamp. COPYRIGHT: (C)2008,JPO&INPIT |
