US 12,432,848 B2
Wiring board and electronic equipment
Shoji Matsumoto, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/342,941.
Claims priority of application No. 2022-114387 (JP), filed on Jul. 15, 2022.
Prior Publication US 2024/0023231 A1, Jan. 18, 2024
Int. Cl. H05K 1/02 (2006.01)
CPC H05K 1/0245 (2013.01) [H05K 1/025 (2013.01); H05K 2201/09236 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wiring board that is a flexible printed wiring board comprising:
a base layer of resin;
a plurality of differential signal wirings, each of which includes a pair of signal wirings, formed on the base layer;
a first ground wiring formed on the base layer; and
a second ground wiring formed on the base layer,
wherein the plurality of differential signal wirings include a first differential signal wiring and a second differential signal wiring, which extend in a first direction and are aligned in a second direction intersecting the first direction,
wherein the first ground wiring includes a first wiring, a second wiring, and a third wiring, which extend in the first direction and are aligned in the second direction,
wherein the second ground wiring includes:
a fourth wiring and a fifth wiring facing the first differential signal wiring in a third direction via the base layer and spaced apart from each other in the first direction in a plan view viewed in the third direction; and
a sixth wiring and a seventh wiring facing the second differential signal wiring in the third direction via the base layer and spaced apart from each other in the first direction in the plan view viewed in the third direction,
wherein the first wiring is arranged along the first differential signal wiring so that the first differential signal wiring is positioned between the first wiring and the second wiring, in the plan view viewed in the third direction,
wherein the second wiring is arranged along the first differential signal wiring and the second differential signal wiring so as to be positioned between the first differential signal wiring and the second differential signal wiring, in the plan view viewed in the third direction,
wherein the third wiring is arranged along the second differential signal wiring so that the second differential signal wiring is positioned between the second wiring and the third wiring, in the plan view viewed in the third direction,
wherein, in the plan view viewed in the third direction, a spacing between the second wiring and the first differential signal wiring is wider than a spacing between the pair of signal wirings of the first differential signal wiring, and a spacing between the second wiring and the second differential signal wiring is wider than a spacing between the pair of signal wiring of the second differential signal wiring, and
wherein the fourth wiring and the fifth wiring are electrically connected to the sixth wiring and the seventh wiring.