| 摘要 |
[Problem] To provide a printed circuit board in which holes in a printed wiring can be readily filled with solder and the heat can be readily decreased , even if the printed wiring has a greater length or width. [Solution] A printed circuit board (1) on which a plurality of electronic components are arranged, a printed wiring (2) for causing a current to flow between the electronic component being provided to the printed circuit board, the electronic components being connected using solder to the printed wiring (2) by soldering; the printed circuit board being characterized in that: a plurality of long holes (3) are provided, along the current flow, to the printed wiring (2); the long holes (3) form a first long hole row (31) along the direction of current flow, and a second long hole row (32) provided alongside the first long hole row (31); the long holes in the second long hole row (32) are provided so as to face a spacing between long holes that are disposed in series in the first long hole row (31); and the solder (8) fills the long holes in the first long hole row (31) and the long holes in the second long hole row (32). |
