Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1995-02-01
1996-11-19
McPherson, John A.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430318, 430319, 216 17, 216 18, 216 19, G03F 700
Patent
active
055761488
ABSTRACT:
The present invention provides a process for producing a high-density printed wiring board with plated throughholes, at high productivity and reliability by a direct drawing method. The process comprises making throughholes in a substrate having an electro-conductive layer on each side; conducting plating on at least the walls of the substrate throughholes; forming a photosensitive resist film on each side of the substrate; applying an actinic radiation onto the resist film by a direct drawing method in the shape of a pattern to be obtained when the resist film is a negative type, or in the shape of a pattern reverse to a pattern to be obtained when the resist film is a positive type; forming, on the uncoated portion inside the throughholes by electrodeposition, an electrodeposition film which is insoluble in a developing solution used later and an etching solution used later but is removable with a peeling solution used later; conducting development with an appropriate developing solution to remove the resist film; removing the exposed plating layer portion and the electro-conductive layer portion present therebeneath, by etching; and then peeling the remaining resist film and the electrodeposition film inside the throughholes, with an appropriate peeling solution.
REFERENCES:
patent: 4746399 (1988-05-01), Demmes et al.
patent: 4766055 (1988-08-01), Kawabata et al.
patent: 4983252 (1991-06-01), Masui et al.
patent: 5045434 (1991-09-01), Yoshihara et al.
patent: 5102775 (1992-04-01), Okuhara et al.
patent: 5344740 (1994-09-01), Iwasawa et al.
Imai Genji
Iwasawa Naozumi
Kogure Hideo
Takeda Yukari
Kansai Paint Co. Ltd.
McPherson John A.
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