| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform light control along with a conventional illumination load by one parent unit. SOLUTION: The light control signal branching filter A comprises input terminals t0, t0 connected to a light control signal line 6, a receiving circuit 100 receiving various kinds of light control signals having different periods inputted from the input terminals t0, t0 through the light control signal line 6, a branching filter circuit 101 branching the various kinds of received light control signals by one to several kinds of periods, one or a plurality of branching filter transmission circuits 103 transmitting the various kinds of light control signals transmitted through the light control signal line 6. With this constitution, the light control signals branched from the light control signal branching filter A are transmitted to a conventional illumination load 4b and a lighting control of the conventional illumination load 4b which does not have means for selecting the light control signals having a predetermined period among the various kinds of light control signals whose periods are different and illumination loads 4a1, 4a2... having said means can be controlled by one main unit M.</p> |
