Process for manufacturing printed circuit boards
First Claim
1. Process of manufacturing printed circuit boards, comprising the following steps:
- a) applying a masking layer to an insulating carrier substrate,b) then producing recesses in the masking layer and in an upper region of the carrier substrate for at least one of (i) soldering pads, (ii) conductor traces and (iii) through holes in the masking layer and the carrier substrate,c) then applying a conductive layer to the surface of the carrier substrate while the masking layer is in situ on the carrier substrate so that the conductive layer is applied to the masking layer and recesses,d) then removing the masking layer with the conductive layer applied thereon without removing the conductive layer from the recesses so that a residual portion of the conductive layer remains in the recesses, ande) then applying metal to the residual portion of the conductive layer to attain a thicker residual portion.
4 Assignments
0 Petitions
Accused Products
Abstract
Process for manufacturing circuit boards in which a masking layer (2) is applied to a carrier substrate (1) of insulating material and after producing openings for soldering pads, conductor traces, and through or blind holes, in accordance with a preferred embodiment by laser ablation, a thin electrically conductive layer (5) is applied to the surface of the carrier substrate including the masking layer. Subsequently, the masking layer (2) and the conductive layer deposited thereon, for example copper, are removed and the remaining metal surfaces (6) are chemically reinforced to produce the desired thickness. The process permits the production of dense structures using few process steps and without additional abrasion steps.
-
Citations
9 Claims
-
1. Process of manufacturing printed circuit boards, comprising the following steps:
-
a) applying a masking layer to an insulating carrier substrate, b) then producing recesses in the masking layer and in an upper region of the carrier substrate for at least one of (i) soldering pads, (ii) conductor traces and (iii) through holes in the masking layer and the carrier substrate, c) then applying a conductive layer to the surface of the carrier substrate while the masking layer is in situ on the carrier substrate so that the conductive layer is applied to the masking layer and recesses, d) then removing the masking layer with the conductive layer applied thereon without removing the conductive layer from the recesses so that a residual portion of the conductive layer remains in the recesses, and e) then applying metal to the residual portion of the conductive layer to attain a thicker residual portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification