LAMINATED SUBSTRATE AND METHOD OF MANUFACTURING LAMINATED SUBSTRATE
A laminated substrate includes multilayer substrates stacked, wherein the multilayer substrates are each provided with a through hole which penetrates the multilayer substrates, an inner wall surface of which is plated, and which is filled with resin, and bonding lands formed on upper and lower surfaces of the through hole and electrically coupled to the through hole, an insulating adhesive layer and a conductive paste via for electrically coupling the bonding lands of the multilayer substrates opposed to each other with a conductive paste with which a through hole formed in the insulating adhesive layer is filled are disposed between the multilayer substrates, and the conductive paste via is disposed at a position different from a position at which the through hole is formed.
1 . A laminated substrate comprising:
a plurality of multilayer substrates stacked on one another, wherein
each of the multilayer substrates is provided with a through hole which penetrates each of the multilayer substrates, an inner wall surface of which is plated, and an inside of which is filled with resin, and bonding lands which are formed on an upper surface and a lower surface of the through hole and which are electrically coupled to the through hole,
an insulating adhesive layer and a conductive paste via configured to electrically couple the bonding lands of the multilayer substrates opposed to each other with a conductive paste with which a through hole formed in the insulating adhesive layer is filled are disposed between the multilayer substrates, and
the conductive paste via is disposed at a position different from a position at which the through hole is formed.
2 . The laminated substrate according to claim 1 , wherein
a plurality of the conductive paste vias is disposed at positions different from the position at which the through hole is formed with respect to the set of bonding lands forming a pair.
3 . The laminated substrate according to claim 2 , wherein
the bonding lands are formed to have a size enough to arrange the plurality of conductive paste vias.
4 . The laminated substrate according to claim 3 , wherein
the bonding lands are formed to have a substantially quadrangular shape centering on the through hole so that the conductive paste vias are disposed at four places on a periphery centering on the through hole.
5 . The laminated substrate according to claim 1 , wherein
the bonding lands have a substantially elliptical shape or a substantially oval shape which couples a position at which the conductive paste via is disposed and a position at which the through hole is disposed.
6 . The laminated substrate according to claim 1 , wherein
the bonding lands have a shape obtained by coupling a first circular portion surrounding the through hole and a second circular portion surrounding a position at which the conductive paste is disposed.
7 . A method of manufacturing a laminated substrate by stacking a plurality of multilayer substrates each provided with a through hole an inner wall surface of which is plated, and an inside of which is filled with resin, and bonding lands which are formed on an upper surface and a lower surface of the through hole and which are electrically coupled to the through hole, the method comprising:
a step of stacking an insulating adhesive layer on an upper surface of one of the multilayer substrates;
a step of forming a through hole penetrating the insulating adhesive layer at a position different from a position at which the through hole is formed so as to electrically couple the bonding land of the one of the multilayer substrates and the bonding land of another of the multilayer substrates opposed to the one of the multilayer substrates;
a step of filling the through hole with a conductive paste to form a conductive paste via; and
a step of bonding the plurality of multilayer substrates with thermocompression bonding to cure the insulating adhesive layer and the conductive paste to thereby integrate the plurality of multilayer substrates.
8 . The method of manufacturing the laminated substrate according to claim 7 , further comprising:
before the step of stacking the insulating adhesive layer on the upper surface of the one of the multilayer substrates,
a step of filling a recessed portion between the bonding land and another metal layer or another bonding land with insulating resin and grinding a surface to thereby perform planarization so as to eliminate asperity of a surface to be opposed to another of the multilayer substrates in the upper surface of the one of the multilayer substrates and the lower surface of the other of the multilayer substrates.