US Patent No. 9,345,140

PRINTED CIRCUIT BOARD


Patent No. 9,345,140
Issue Date May 17, 2016
Title Printed Circuit Board
Inventorship Hiroshi Isono, Kawasaki (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,345,140

1. A printed circuit board comprising:
a first semiconductor package including a first signal terminal group and a second signal terminal group arranged on an outer
circumference side with respect to the first signal terminal group;

a second semiconductor package including a third signal terminal group and a fourth signal terminal group arranged on an inner
circumference side with respect to the third signal terminal group and transmitting a bus signal with the first semiconductor
package; and

a printed wiring board in which the first semiconductor package is mounted on a first surface layer, the second semiconductor
package is mounted on a second surface layer, and a first signal layer and a second signal layer are arranged on an inner
layer which is different from the first surface layer and the second surface layer,

wherein the first signal layer is provided to be closer to the second surface layer than the second signal layer,
wherein a first bus wiring formed on the first signal layer is connected to the first signal terminal group provided in the
first semiconductor package and the third signal terminal group provided in the second semiconductor package via a first via
hole prepared in the printed wiring board, the first bus wiring formed on the first signal layer and a third via hole prepared
in the printed wiring board, and

wherein a second bus wiring formed on the second signal layer is connected to the second signal terminal group provided in
the first semiconductor package and the fourth signal terminal group provided in the second semiconductor package via a second
via hole prepared in the printed wiring board, the second bus wiring formed on the first signal layer and a fourth via hole
prepared in the printed wiring board.