| 摘要 |
PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device including a light control circuit capable of achieving a wide light control range without generating a luminance slope of a discharge lamp between a high pressure side and a lower pressure side even when a long discharge lamp is used. SOLUTION: The discharge lamp lighting device 1 is provided with the light control circuit. The light control circuit includes an amplitude adjusting circuit 7 for superimposing a first light control signal A of a direct current voltage and a second light control signal B of a pulse width modulation signal, an integrating circuit 8 for integrating an output of the amplitude adjusting circuit 7, and a comparison circuit 13 for comparing an output of the integrating circuit 8 and a triangular wave H having a predetermined frequency, and generating a light control signal G, and performs burst light control based on the light control signal G. COPYRIGHT: (C)2007,JPO&INPIT |
