| 摘要 |
PROBLEM TO BE SOLVED: To prevent defects such as poor contacting due to the occurrence of cracks in a printed circuit at a bent part of a dent and an open edge part, when the dent is drawn. SOLUTION: For a metal core printed circuit board 10 with a dent and a lighting device using it, the width of a common printed circuit 13A and the dimensions in width direction for all N pieces of independent printed circuit 13B to D are almost equal, so that the dimension in width direction of the independent printed circuit is larger, and no cracks occur with a printed circuit at a bent part of the dent and an open edge part when the dent is drawn, without the possibility of such defects as poor contacting. |
