Composite laminate circuit structure and method of forming...

Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C174S262000

Reexamination Certificate

active

06175087

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to the formation of laminate circuit structures by photolithographic techniques, and more particularly to a method of forming composite laminate structures which utilizes a multiplicity of preformed circuits having signal and voltage planes and a laminate structure having a ground plane without signal planes.
2. Background Information
A conventional technique of forming a laminate circuit board structures includes forming layers of dielectric material and electrically conducting material to provide multiple layers of circuits and voltage planes. Voltage planes can be either ground plane or power plane, and are sometimes collectively referred to as power planes. In one prior art technique of forming such structure, layers of dielectric material and conducting material successively applied, i.e. the dielectric material is applied and then voltage planes are supplied thereon and if necessary through holes formed by the drilling or etching of through holes or blind vias. This technique relies on each successive step adding additional structure and the circuitry layers are formed individually; i.e., in each step in forming the signal planes the planes are formed after the formation of the prior layer of signal plane and forming the signal plane on formed power planes. This requires precession drilling to form the plated through holes all of which is time consuming, especially where there is a large number of drilled holes required to form plated through holes.
Thus it is desired to provide a relatively inexpensive photolithographic technique of forming a composite laminate structure from individual discrete laminate structures into a composite laminate structure.
SUMMARY OF THE INVENTION
A method forming a composite laminate structure includes providing first and second circuit board element each having circuitry on at least one face thereof and plated through holes. A voltage plane element is provided having at least one voltage plane having opposite faces with layers of partially cured photodielectric material on each face. At least one hole is photopatterned and etched through the voltage plane element but completely isolated from the voltage plane. Each through hole in the voltage plane element is aligned with a plated through hole in each of the circuit board elements to provide a surface on the voltage plane element communicating with the plated through holes. The voltage plane is laminated between the circuit board elements and the photoimageable material on the voltage plane is fully cured. The surfaces of the voltage plane element communicating with the plated through holes in the circuit board elements are plated with a conducting material to establish a connection between the circuitry on the first and second circuit board elements.


REFERENCES:
patent: 4498122 (1985-02-01), Rainal
patent: 4566186 (1986-01-01), Bauer et al.
patent: 4720322 (1988-01-01), Tiffin
patent: 4756930 (1988-07-01), Kukanskis et al.
patent: 4816115 (1989-03-01), Hörner et al.
patent: 4854038 (1989-08-01), Wiley
patent: 4902610 (1990-02-01), Shipley
patent: 4915983 (1990-04-01), Lake et al.
patent: 4978420 (1990-12-01), Bach
patent: 4999740 (1991-03-01), Iiardi et al.
patent: 5026624 (1991-06-01), Day et al.
patent: 5108785 (1992-04-01), Lincoln et al.
patent: 5137618 (1992-08-01), Burnett et al.
patent: 5191174 (1993-03-01), Chang et al.
patent: 5229550 (1993-07-01), Bindra et al.
patent: 5239448 (1993-08-01), Perkins et al.
patent: 5258094 (1993-11-01), Furui et al.
patent: 5298685 (1994-03-01), Bindra et al.
patent: 5308929 (1994-05-01), Tani et al.
patent: 5334488 (1994-08-01), Shipley, Jr.
patent: 5337487 (1994-08-01), Kindl et al.
patent: 5391513 (1995-02-01), Delgado et al.
patent: 5420078 (1995-05-01), Sikora
patent: 5436062 (1995-07-01), Schmidt et al.
patent: 5448020 (1995-09-01), Pendse
patent: 5451291 (1995-09-01), Park et al.
patent: 5453403 (1995-09-01), Meng et al.
patent: 5470793 (1995-11-01), Kalnitsky
patent: 5471091 (1995-11-01), Pasch et al.
patent: 5483100 (1996-01-01), Marrs et al.
patent: 5487218 (1996-01-01), Bhatt et al.
patent: 5514622 (1996-05-01), Bornstein et al.
patent: 5774340 (1998-06-01), Chang et al.
patent: 5930119 (1999-07-01), Berding
patent: 5955704 (1999-09-01), Jones et al.
patent: 6040524 (2000-03-01), Kobayashi et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Composite laminate circuit structure and method of forming... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Composite laminate circuit structure and method of forming..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite laminate circuit structure and method of forming... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2535163

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.