Circuit board and process for producing same

Details Circuit board and process for producing same Circuit board and process for producing same

1991-09-18

1993-08-17

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428245, 428328, B32B 900

Patent

active

052367720

ABSTRACT:
A circuit board comprising: a core material made from magnesium, a magnesium alloy, or a magnesium-based composite material, and an electric circuit formed on the core material. A process for producing the circuit board comprises the steps of (1) forming an electrodeposition-painted coating on such a core material, (2) forming a polyimide resin coating on the electrodeposition-painted coating, (3) forming a via hole extending through the resin coating to the underlying electrodeposition-painted coating, (4) etching and removing the electrodeposition-painted coating in the region exposed in the bottom of the via hole while masking the other region with the resin coating thereby extending the via hole to the core material, (5) forming a metal film on at least a free surface of the resin coating and an inner surface of the extended via hole, and (6) etching the metal film by using a photoresist mask to form a conductor layer having a predetermined pattern.

REFERENCES:
patent: 3672849 (1972-06-01), Bredzs et al.
patent: 4087300 (1978-05-01), Adler
patent: 4125661 (1978-11-01), Messerschmidt, Jr.
patent: 4609586 (1986-09-01), Jensen et al.

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