| 摘要 |
PROBLEM TO BE SOLVED: To provide a dimming signal conversion circuit for reducing distortion of a DC voltage dimming signal to be supplied to a discharge lamp lighting circuit. SOLUTION: The dimming signal conversion circuit 13 includes a DC voltage dimming signal inputting part 51, a first conversion circuit 52 for converting the DC voltage dimming signal input from the DC voltage dimming signal inputting part 51 into a pulse width modulation signal, a pulse-width modulation dimming signal inputting part 53 for inputting the pulse width modulation dimming signal from outside, a second conversion circuit 54 for converting the pulse-width modulation signal input from the first conversion circuit 52 or the pulse-width modulation dimming signal inputting part 53 into the DC voltage dimming signal, and a pulse-width modulation dimming signal outputting part 55 for outputting outside the pulse-width modulation signal to be input into the second conversion circuit 54. COPYRIGHT: (C)2010,JPO&INPIT |
