| 摘要 |
PROBLEM TO BE SOLVED: To track the positions of light sources and to realize desired optical communication by specifying a light-receiving element among elements arranged in a matrix form even if light signals are simultaneously made incident on the light-receiving element from the plural light sources. SOLUTION: In a light-receiving element array arranged in the matrix form, a horizontal scanning circuit 4 and a vertical scanning circuit 7 send signals showing the positions of switching MOSFETSW12 and 34 becoming in a on-state to a detection circuit 3 by the element receiving the light signals from the light sources. The detection circuit 3 specifies the position of the photodiode receiving light and informs a decoder 8 of it. The decoder 8 outputs the output signal of the element receiving the light signal to a terminal T by setting one of switching MOSFETS1-S4 to be the on-state based on the signal. Thus, even the light signals from the plural light sources can track the positions of the light sources, mutually read the output signals of the light-receiving elements and can execute optical communication with plural opposite stations. |
