Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1982-01-12
1983-10-25
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
1566591, 430315, 430318, 29846, G03C 500
Patent
active
044119828
ABSTRACT:
A disclosed method of continuous making flexible printed circuits for use in radio set or the like appliances, includes punching holes in a continuous copper-film clad insulating substrate, forming photopolymer films on the faces of the copper films exposing the photopolymer film to photochemical light of a predetermined pattern, developing the exposed photopolymer film, etching the copper film utilizing remaining parts of the photopolymer film as etching masks, removing the remaining photopolymer films 40 and printing solder-resist films on selected parts. The improvement is to provide and retain selected oblong parts of said conductor metal film disposed on and parallel to longitudinal direction of the continuous substrate by, for example, covering these parts by etching-resist films. The retained oblong parts of the metal film serve to prevent shrinkage of the substrate during the conduct of further manufacturing steps thereby assuring registration of the patterns of the printed circuits and the printed solder-resist films.
REFERENCES:
patent: 3606679 (1971-09-01), Schroeder
patent: 4063993 (1977-12-01), Burns
patent: 4259436 (1981-03-01), Tabuchi et al.
patent: 4316320 (1982-02-01), Nogawa et al.
patent: 4325780 (1982-04-01), Schulz, Sr.
Weaver, H. A., "High Volume Production of Flexible PWBs," Western Electric Co. Inc., Richmond, Virginia, USA, pp. 1.27.1-1.27.14.
Hasuike Fumio
Kaneda Satoshi
Kanehisa Takashi
Kondo Masatoshi
Nogawa Kenji
Dees Jos,e G.
Kittle John E.
Matsushita Electric - Industrial Co., Ltd.
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