| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device that can obtain even optical output in arranging a plurality of plane-shaped light sources and has a long life span, and provide an illumination apparatus using the lighting device. <P>SOLUTION: An illumination apparatus comprises a lighting device 1 connected to a commercial power supply AC and a plurality of plane-shaped light sources 2a to 2d. Each of the plane-shaped light sources 2 includes an organic EL element and emits light with illumination in accordance with inputted lighting power. The lighting device 1 comprises a power-factor correction (PFC) circuit 11 for converting alternating-current power from the commercial power supply AC to direct-current power and voltage drop circuits 10a and 10b. A serial circuit including the plane-shaped light sources 2a and 2d is connected to the voltage drop circuit 10a, and a serial circuit including the plane-shaped light sources 2b and 2c is connected to the voltage drop circuit 10b. That is, a light source group is made for each of the plane-shaped light sources 2 of which the number is the same and that are adjacent to each other, and each of the voltage drop circuits 10 having different output voltages is connected to each of the light source groups. <P>COPYRIGHT: (C)2012,JPO&INPIT |
