When manufacturing a semiconductor device by mounting a semiconductor chip 2 on a substrate 1 with a flip-chip method, projections 9 are formed between pads 4 arranged in multiple annular concentric layers on the semiconductor chip 2 other than pads 4 arranged along the innermost periphery thereof. A semiconductor material has a semiconductor device region and an edge termination region. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 41-144 RZ. When a vehicle moves between the transmitter and receiver, the optical signals are blocked.