| 摘要 |
PURPOSE:To realized a substantially increased range of optical communication and improve resolution, while using conventional semiconductor light-emitting device such as LED. CONSTITUTION:A light-emitting device includes LEDs 1 to 7, a drive circuit 11 for energizing the LEDs individually, and a timing control circuit 12 for the drive circuit 11. The timing control circuit functions to control the individual LEDs to operate at the substantially maximum forward pulse current. In addition, it controls the drive circuit 11 to light the LEDs in sequence at predetermined intervals. |
