US 12,269,238 B2
Multilayer resin substrate and method for producing same
Yoshimasa Nishi, Nagaokakyo (JP); and Tomohiro Nagai, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Dec. 15, 2022, as Appl. No. 18/081,801.
Application 18/081,801 is a continuation of application No. PCT/JP2021/023304, filed on Jun. 21, 2021.
Claims priority of application No. 2020-108644 (JP), filed on Jun. 24, 2020.
Prior Publication US 2023/0119857 A1, Apr. 20, 2023
Int. Cl. B32B 15/08 (2006.01); B32B 7/022 (2019.01); B32B 15/20 (2006.01); H05K 1/02 (2006.01); H05K 1/03 (2006.01); H05K 3/46 (2006.01)
CPC B32B 15/08 (2013.01) [B32B 7/022 (2019.01); B32B 15/20 (2013.01); H05K 1/0218 (2013.01); H05K 1/0237 (2013.01); H05K 1/032 (2013.01); H05K 3/4655 (2013.01); B32B 2305/55 (2013.01); B32B 2307/538 (2013.01); B32B 2457/08 (2013.01); H05K 2201/0141 (2013.01); H05K 2201/0355 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer resin substrate comprising:
a plurality of resin layers that are laminated;
a first metal foil on the plurality of resin layers and including first and second main surfaces having first and second surface roughnesses, respectively; and
a second metal foil on the plurality of resin layers and including third and fourth main surfaces having third and fourth surface roughnesses, respectively; wherein
when the first surface roughness, the second surface roughness, the third surface roughness, and the fourth surface roughness are denoted as SR1, SR2, SR3, and SR4, respectively, a relationship SR1<SR3≤SR4<SR2 is satisfied.