| 摘要 |
PROBLEM TO BE SOLVED: To provide a planar lighting device which can further expand a lighting area, at the same time, has preferable assembling working property and also allows heat releasing property of an LED as a light source to be considered.SOLUTION: An FPC10A has a multi-layer structure which includes a first conductor pattern 12A formed on one layer and a second conductor pattern 14A formed on a different layer. On the first conductor pattern 12A and the second conductor pattern 14A, boundary parts 12ABP, 14ABP which respectively divide conductors are formed in such a manner as to intersect each other in the plane view. When the FPC10A is viewed in the plane view, an area in which conductor parts of the first conductor pattern 12A and the second conductor pattern 14A do not exist in the thickness direction is restricted to an intersection part CP of the boundary parts 12ABP, 14ABP and the area in which the conductor part does not exist on either layer overlapped in the thickness direction of the FPC is narrowed and, thereby, bending strength of the FPC10A is secured. |
