Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-05-23
2000-02-08
Jones, Deborah
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428192, B32B 300, B32B 2302
Patent
active
060226110
ABSTRACT:
A circuit board capable of accomplishing an increase in current capacity and therefore a reduction in resistance of a through-hole conductive section each formed by filling a conductive paste in each of through-holes formed in a paper base insulating substrate by punching. A punching pin is thrust into the paper base insulating substrate provided on front and rear surfaces thereof with copper foil lands from a side of the front surface, resulting in the through-holes being formed. A drawing pin is inserted into each of the through-holes from a side of the rear surface of the insulating substrate through a rear opening of the through-hole, to thereby curve an inner peripheral portion of the rear copper foil land toward an interior of the through-hole and cut off any swell in the through-hole. The through-holes each are filled with the conductive paste, followed by curing the paste, so that the through-hole conductive section is formed for electrically connecting copper foil lands to each other.
REFERENCES:
patent: 4029845 (1977-06-01), Nomura
patent: 4486505 (1984-12-01), Fushiki et al.
patent: 4578308 (1986-03-01), Hani et al.
patent: 5131141 (1992-07-01), Kawaguchi
patent: 5346750 (1994-09-01), Hatakeyama et al.
Araki Shinji
Nakagaki Tadahiko
Sakurai Shizuo
Shinkawa Sakae
Hokuriku Electric Industry Co., Ltd.
Jones Deborah
Lam Cathy F.
Rankin Carl A.
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