| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost lighting-controlled illumination device that can perform such rendering lighting control that the brightness varies naturally for human visibility.SOLUTION: Brightness data for setting gradation of brightness are stored in a brightness data table 23a. Index data for specifying the brightness data of the brightness data table 23a in a predetermined time-sequence for rendering lighting control are stored in the index data table 23b to be arranged time-sequentially. A control circuit 20 successively reads out the time-sequential index data from the index data table 23b every PWM period, and the brightness data are read out from the brightness data table 23a according to the specification of the read-out index data, and a lighting control signal based on a PWM mode for performing lighting control on an LED 40 is generated on the basis of the read-out brightness data. A driving circuit 30 controls power to be supplied to the LED 40 on the basis of the lighting control signal of the control circuit 20 to turn on the LED 40.SELECTED DRAWING: Figure 1 |
