Patent ID: 7955485
Filing Date: 2011-06-07
Classification: C23F,H05K,Y10T

Abstract:
1. A method for the manufacture of organic laminate substrate Printed Circuit Boards (PCB) having electrical pathways at or below 10μ wide comprising the steps of: 1) obtaining a fully cured polymer dielectric substrate planar base having a first face with a first layer of copper cladding laminated thereon and a second parallel face with a second layer of copper cladding thereon; 2) forming at least one blind perforation through said first layer of copper cladding and said planar base down to said second layer of copper cladding; 3) applying a plating resist material to the areas of the first and second layers of copper cladding that are not to have any copper traces deposited thereon; 4) applying a mask (image) such that the exposed plating resist material when exposed to UV light will polymerize so the non-polymerized plating resist material can be developed away; 5) applying an electric current to said second layer of copper cladding such that the blind perforations and the non plating resist material coated areas of the first and second layers of copper cladding are plated with copper; 6) stripping the plating resist material from the first and second layers of copper cladding; 7) applying an etch resist material to the second layer of copper cladding; 8) etching away all of the exposed first layer of copper cladding to leave copper cladding pads extending from said planar base; 9) stripping the etch resist from the second layer of copper cladding to form a base planar material for the fabrication organic laminate substrate PCBs; 10) obtaining an improved planar laminate substrate made of a non-fiberglass reinforced dielectric polymer resin substrate film base having a top and bottom planar face with a hydrophillic layer formed onto said top planar face, a copper base layer formed on the hydrophillic layer and an adhesive layer affixed onto the bottom planar face wherein said adhesive layer is made of said dielectric polymer in a non fully cured state; 11) affixing the adhesive layer of the improved planar laminate substrate by heat and pressure to at least a first side of the base planar material for the fabrication organic laminate substrate PCBs such that the adhesive layer conforms and adheres to irregularities of the first side; 12) forming at least one blind bore through the improved planar laminate substrate penetrating to the copper cladding pads of the base planar material; 13) applying plating resist material onto the copper base layer of the improved planar laminate substrate in a patterned image of the area not to have any copper traces deposited thereon; 14) applying a mask (image) to the plating resist material such that the exposed plating resist material when exposed to UV light will polymerize such that the non-polymerized plating resist material can be developed away; 15) applying an electric current to the second layer of copper cladding on the planar base material such that the blind bores and the non plating resist material coated areas of the copper base layer are plated with copper so as to form micro circuitry, (pads and traces) having widths down to 10μ or less; 16) stripping the plating resist material from both the second layer of copper cladding and the copper base layer; 17) applying an etch resist material to the copper base layer; 18) etching away all of the exposed copper from the copper base layer leaving only micro circuitry and the remnants of the hydrophillic layer; 19) stripping the etch resist material from the second layer of copper cladding.