| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide path capable of reducing loss on a connection part of a linear light guide path and a curve light guide path.SOLUTION: A curve pattern of a curve light guide path core 12B is a semi arc of a curvature radius r, and is connected to a linear light guide path core 12A at its both ends. Width Wb of the curve light guide path core 12B is Wa+ΔW, and is wider than width Wa of the linear light guide path core 12A by length of ΔW. On a connection part 3 of the linear light guide path core 12A and the curve light guide path core 12B, an outer side face of the linear light guide path core 12A is continuous to an outer side face of the curve light guide path core 12B without steps. On the other hand, an inner side face of the linear light guide path core 12A is not continuous to an inner side face of the curve light guide path core 12B and there is a step 14 of ΔW.SELECTED DRAWING: Figure 1 |
