Patent ID: 7049763
Filing Date: 2006-05-23
Classification: H01J

Abstract:
1. An electrodeless low-pressure discharge lamp operating device, comprising: a light-transmitting discharge bulb filled with a rare gas including at least krypton and mercury; an induction coil including a core and a coil wound around the core for generating an electromagnetic field inside the discharge bulb; and a ballast circuit for supplying a high-frequency power to the induction coil, wherein: an operating frequency of the ballast circuit is in a range of 80 kHz to 500 kHz, and where the operating frequency of the ballast circuit is f (kHz) and a power input to the discharge bulb is P (W), a pressure p (Pa) of the rare gas in the discharge bulb satisfies a relationship of a following expression: where A, B and C are constants having the following values: A=4.0×10 4 , B=3.5×10 4 and C=6.2; and the power input P to the discharge bulb is 7 W at minimum and 22 W at maximum.