US Patent No. 9,872,388

PRINTED WIRING BOARD


Patent No. 9,872,388
Issue Date January 16, 2018
Title Printed Wiring Board
Inventorship Nobuhisa Sugimoto, Yamanashi (JP)
Takeshi Sawada, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,872,388

1. A printed wiring board on which an electronic component comprising electrode terminal rows on four peripheral sides or
two opposite sides thereof is mounted, the printed wiring board comprising:
pad rows corresponding to the electrode terminal rows; and
each of pads at the both ends of the pad rows comprises an extension extending outwardly relative to the other pads not at
the both ends of the pad rows, the extension extending outwardly relative to the other pads in the direction of arrangement
of the pads from the center of the electronic component, the extension having a shape obtained by diagonally cutting a corner
located farthest from the center of the electronic component, wherein

one of the pads of the printed wiring board is a corner pad overlapping a corner of the electronic component;
each of the pads at the both ends of the pad rows comprises a solder fillet formed on the pad and on the extension when the
electronic component is mounted on the printed wiring board, and

the solder fillet formed on the pads and the extension of the pads at the both ends of the pad rows is greater and thicker
than a solder fillet formed on the pad not at the both ends of the pad rows, and

wherein, in the direction of arrangement of the pads, each of pads at the both ends of the pad rows has a width greater than
widths of the other pads not arranged at the both ends of the pad rows.