Abstract: In a visible light communication system including a transmission device and a receiving device arranged separately in a vertical direction and provided so as to relatively move in a horizontal direction, which transmits data from the transmission device to the receiving device by optical space transmission using visible light, the transmission device includes a first light emitting part outputting visible light, and the first light emitting part has a light source emitting visible light and a correction part correcting the light radiated from the light source so as to uniform a light intensity distribution on a horizontal plane. Even when the transmission device and the receiving device arranged separately in the vertical direction relatively move in a horizontal direction, data can be stably transmitted and received by the optical space transmission using visible light.

Abstract: A small sized, low cost plate conveyance robot includes first and second driving motors on first and second link mechanisms respectively. The rotation angles of three driving motors are simultaneously and sequentially controlled to allow the third arm to make a rectilinear motion by a predetermined distance L in a fixed direction in a horizontal plane in order to take a plate material to be conveyed into the suction hand portion of the third arm as well as to take out the plate from the suction hand portion of the third arm after finishing the given conveyance operation.