CPC H05K 1/111 (2013.01) [H05K 1/185 (2013.01); H05K 2201/10515 (2013.01); H05K 2201/10674 (2013.01)] | 23 Claims |
1. A printed circuit board comprising:
a substrate including an external connection pad; and
a metal post extending to the outside of the substrate in a thickness direction of the substrate from the external connection pad,
wherein:
the metal post includes:
a first post portion,
a second post portion extending to the outside of the substrate in the thickness direction of the substrate, and
a third post portion extending to the outside of the substrate in the thickness direction of the substrate from the second post portion,
the third post portion provides a lowest end portion of the metal post,
the second post portion has a width narrower than the first post portion and the third post portion, and
at least a portion of the second post portion is exposed from the first post portion.
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