| 摘要 |
PROBLEM TO BE SOLVED: To reduce stress caused by dividing boards by arranging an integrated circuit almost parallel to the long direction of a board and forming at least one slit at the end of the board where the integrated circuit is not arranged when a lighting main circuit and the control integrated circuit are mounted on almost the rectangular printed circuit board. SOLUTION: Three printed circuit boards A, B, C are arranged in a sheet shape so as to allow parallel mounting to increase mounting efficiency, then after mounting components, the printed circuit boards are divided. A control high voltage integrated circuit(HVIC) 4 is arranged in almost parallel to the long direction of the board. A slit S is formed at one end of the board on which the HVIC 4 is arranged, and a peripheral circuit 5 is arranged along the portion where the slit S is formed. When the board is divided, stress caused by bending of the board is hardly applied to the part of the peripheral circuit 5 arranged between the HVIC 4 and the end of the board, and peeling off of components can be avoided. Since a wiring pattern of the HVIC 4 and an element of the periphery circuit 5 can be made shortest, noise resistance is enhanced. |
