Printed wiring board comprising a conductive pattern...

Details Printed wiring board comprising a conductive pattern... Printed wiring board comprising a conductive pattern...

H - Electricity

05

K

356/18

H05K 3/06 (2006.01) H05K 1/11 (2006.01) H05K 3/42 (2006.01) H05K 3/44 (2006.01) H05K 3/10 (2006.01)

Patent

CA 1094226

ABSTRACT OF THE DISCLOSURE In a printed wiring board having an outwardly flaring through-hole, a conductive pattern is formed on the inwardly directed surface of the hole so as to reach a principal surface of the board only at that circumferential portion of the hole where the pattern is continuous to a pattern portion, if any, formed on the principal surface. The pattern is formed in the through- hole by positive use of that portion of a photoresist film formed on the prin- cipal surface to cover the hole which partly protrudes into the hole.

263648

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