| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence of reflection wave energy resulting from mismatching between a power source circuit and a load, and prevent the damage of a power source device with ease by starting a lamp using pulse-like high frequency at a lamp starting time, and lighting the lamp using continuous high frequency after lamp starting. SOLUTION: In a lighting method for an electrodeless high intensity discharge lamp 6 using a high frequency power source, at a lamp 6 starting time, the output of a power amplification circuit 3 is formed into pulse-like high frequency by a puls modulation circuit 7, and the same is used. After lamp starting, the lamp 6 is lighted by a continuous high frequency. The pulse like high frequency for starting the lamp is a repetition wave composed of a high frequency segment T1 and a rest segment T2. The frequency of the high frequency segment T1 is 100Hz to 600kHz, and the duty ratio of the high frequency segment T1 to the rest segment T2 is set in a range of 1/10 to 1/3. |
