| 摘要 |
In order to prevent a PD flexible printed circuit board from peeling from a main surface of an OPU circuit board, a peeling preventing arrangement fixes the PD flexible printed circuit board to the main surface of the OPU circuit board at least three locations. The OPU circuit board is provided with a central reinforcing land for substantially fixing the PD flexible printed circuit board at a central portion thereof and a pair of both end reinforcing lands for fixing the PD flexible printed circuit board at both ends of a plurality of wire terminals. The PD flexible printed circuit board has a central circular hole portion provided at a location corresponding to the central reinforcing land and a pair of both end correction portions provided at locations corresponding to the pair of both end reinforcing lands.
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