ELECTRODELESS DISCHARGE LAMP, AND LIGHTING EQUIPMENT, AND METHOD FOR MANUFACTURING ELECTRODELESS DISCHARGE LAMP

摘要

An 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 followingexpressions are specified; B=W/(4×p×(D/20)², S=p×(d/20)², L=p×(d/10), X=(B×S)/(L×A), this electrodeless discharge lamp satisfies the following expression; t-6=10959×X+25=t+6 (expression) 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.