US 12,403,673 B2
Resin multilayer substrate and method for manufacturing resin multilayer substrate
Asato Fujimoto, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jan. 13, 2023, as Appl. No. 18/096,620.
Application 18/096,620 is a continuation of application No. PCT/JP2021/026064, filed on Jul. 12, 2021.
Claims priority of application No. 2020-124365 (JP), filed on Jul. 21, 2020.
Prior Publication US 2023/0158775 A1, May 25, 2023
Int. Cl. B32B 15/08 (2006.01); B32B 38/10 (2006.01)
CPC B32B 15/08 (2013.01) [B32B 38/10 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2307/202 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A resin multilayer substrate comprising:
a metal foil layer, an upper resin layer, and a lower resin layer; wherein
the metal foil layer includes a metal foil layer upper main surface, a metal foil layer lower main surface with a surface roughness greater than a surface roughness of the metal foil layer upper main surface, and a metal foil layer side surface that is a surface of the metal foil layer excluding the metal foil layer upper main surface and the metal foil layer lower main surface;
the metal foil layer upper main surface is in contact with the upper resin layer;
the metal foil layer lower main surface is in contact with the lower resin layer;
a portion of a lower main surface of the upper resin layer and a portion of an upper main surface of the lower resin layer are in contact with each other to define a layer interface;
in a cross section of the metal foil layer parallel or substantially parallel to a multilayer body up-down direction, a direction from an inner side of a region surrounded by a surface of the metal foil layer toward an outer side portion of a region surrounded by the surface of the metal foil layer of directions perpendicular or substantially perpendicular to the multilayer body up-down direction is defined as an inside-outside direction;
in a cross section of the metal foil layer parallel or substantially parallel to a multilayer body up-down direction, the metal foil layer side surface includes an outer point and an inner point located at a portion where the upper resin layer is in contact with the side surface; and
the inner point is located below the outer point and is located inward of the outer point in the inside-outside direction.