US 12,177,978 B2
Circuit board
Jun Onohara, Tokyo (JP)
Assigned to TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed by TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed on Jun. 3, 2021, as Appl. No. 17/338,524.
Application 17/338,524 is a continuation of application No. PCT/JP2019/046015, filed on Nov. 25, 2019.
Claims priority of application No. 2018-227135 (JP), filed on Dec. 4, 2018.
Prior Publication US 2021/0298172 A1, Sep. 23, 2021
Int. Cl. H01F 27/28 (2006.01); H01F 27/36 (2006.01); H05K 1/02 (2006.01); H05K 1/16 (2006.01); H05K 3/00 (2006.01); H05K 3/10 (2006.01); H05K 3/46 (2006.01); H01F 17/00 (2006.01); H05K 3/02 (2006.01)
CPC H05K 1/165 (2013.01) [H01F 27/363 (2020.08); H05K 1/0218 (2013.01); H05K 1/162 (2013.01); H05K 3/002 (2013.01); H05K 3/0029 (2013.01); H05K 3/108 (2013.01); H05K 3/4673 (2013.01); H01F 17/0006 (2013.01); H01F 2017/0073 (2013.01); H05K 3/02 (2013.01); H05K 2201/0715 (2013.01); H05K 2201/0723 (2013.01); H05K 2203/072 (2013.01); H05K 2203/0723 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A circuit board, comprising:
a glass substrate having a first surface and a second surface facing away from the first surface, a space between the first surface and the second surface of the glass substrate consists of (a) glass, (b) a plurality of distinct through holes and (c) a conductor layer on an inner wall of each through hole of the plurality of distinct through holes;
a first coil wiring pattern formed on the first surface and a second coil wiring pattern formed on the second surface, the first and second coil wiring patterns each constituting part of at least one coil; wherein
each through hole of the plurality of distinct through holes extends through a predetermined portion of the glass substrate from an end of the first coil wiring pattern to an end of the second coil wiring pattern;
conductive layer provides electrical connection between the end of the first coil wiring pattern and the end of the second coil wiring pattern,
the first and second coil wiring patterns and the conductive layer of at least one through hole of the plurality of distinct through holes constitutes the at least one coil wound around a direction perpendicular to an axis of the through hole and to a direction in which the first and second coil wiring patterns extend; and
an electromagnetic shielding layer comprising a conductive material, the electromagnetic shielding layer shielding against electromagnetic waves generated by the at least one coil.