Patent ID: 11445609

Abstract:
There is provided a printed circuit board in which an amount of molten solder adhering over electrodes adjacent to each other is increased in flow soldering. The printed circuit board according to the present invention includes: a first insulating substrate (6) having a mounting hole (15) that penetrates through the first insulating substrate (6) from a first surface (6a) to a second surface (6b); a second insulating substrate (18) including a connection portion (23a) that penetrates through the mounting hole (15) from the first surface (6a) side and protrudes from the second surface (6b); first electrodes (7 and 9) that are provided on the second surface (6b) and are arranged at an edge of the mounting hole (15); and second electrodes (19 and 25) provided on the connection portion (23a). The first electrodes (7 and 9) and the second electrodes (19 and 25) are joined by solder. The printed circuit board further includes a coating film (31) that is disposed at least on a front end side of the connection portion (23a) than a portion where the second electrodes (19 and 25) are joined to the first electrodes (7 and 9) by the solder.