Patent ID: 11930589
Assignee: IBIDEN CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A printed wiring board, comprising:
a lower layer comprising a plurality of conductor layers and a plurality of insulating layers;
a conductor layer formed on an outermost insulating layer of the plurality of insulating layers in the lower layer; and
a solder resist layer formed on the conductor layer such that the solder resist layer is covering the conductor layer formed on the outermost insulating layer of the lower layer; and
a two-dimensional code structure formed on the lower layer and comprising the conductor layer and a portion of the solder resist layer such that the portion of the solder resist layer has a plurality of openings forming a plurality of exposed portions of the conductor layer and that the plurality of openings of the solder resist layer and the plurality of exposed portions of the conductor layer form the two-dimensional code structure,
wherein the conductor layer includes a portion corresponding to the two-dimensional code structure such that the conductor layer has a degas pattern comprising a plurality of degassing holes and formed in the plurality of exposed portions of the conductor layer and that the portion of the conductor layer has a residual copper rate that is 80% or more and allows the two-dimensional code structure be read, where the residual copper rate is a rate of an area with the degas pattern/an area without the degas pattern in the portion of conductor layer.