Metal working – Method of mechanical manufacture – Electrical device making
Patent
1993-06-14
1994-09-20
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29846, 174255, 174261, 427 97, 437217, H01K 310
Patent
active
053477120
ABSTRACT:
A multilayer wiring board and a method for manufacturing the same are disclosed. The wiring board comprises an insulating substrate having a first and second conductor layers formed on major surfaces of the insulating substrate, a blind hole formed through the first conductor layer and the insulating substrate to expose the second conductor layer at the bottom of the blind hole, and a connecting conductor provided to cover the exposed surface of the second conductor layer wall portion of the blind hole and the first conductor layer. Since the connecting conductor and the second conductor are made in surface contact, connection reliability is very much improved. The blind hole is made by blasting a fine abrasive powder beam to selectively remove the insulating substrate. The end of selective removal can be easily controlled by the difference of working speed against the insulating substrate and the conductor layer to successfully expose the second conductor layer at the bottom of the blind hole.
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Mishima Akio
Tamura Toshio
Toi Hiroshi
Yasuda Nobuyuki
Arbes Carl J.
Sony Corporation
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