US5155655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor laminate for use in capacitive printed circuit boards and methods of manufacture
Assignee: Hadco Santa Clara Inc
•
Filing: 1990-05-10
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Granted: 1992-10-13
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Expires: 2010-05-10
Abstract
Abstract A capacitor laminate is described either as an intermediate product for use in a capacitive printed circuit board or as part of the assembled printed circuit board in order to provide a bypass capacitive function for large numbers of devices mounted or formed on the printed circuit board, the capacitor laminate being formed from sheets of conductive material and an intermediate sheet of dielectric material forming the laminated capacitor as a structurally rigid assembly and facilitating its inclusion within the PCB, components of the capacitor laminate having selected characteristics whereby each individual device is provided with capacitance by a proportional portion of the capacitor laminate and by borrowed capacitance from other portions of the capacitor laminate, the capacitive function of the capacitor laminate being dependent upon random firing or operation of the devices. Methods of manufacture for the capacitor laminate as well as the capacitive PCB are also described. The capacitor laminate of the present invention is preferably formed with preferred surface treatment or surface characteristics on the conductive foils employed therein.
Inventors
- 👤 James R. Howard
- 👤 Gregory L. Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:42
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; H10; H10W; H10W44/00; H10W44/601; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/09; H05K2201/09209; H05K2201/0929; H05K2201/09309; H05K3/00; H05K3/46; H05K3/4611; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
182 words
A method for forming a capacitor laminate having laminated components and relatively high capacitance, comprising the steps of selecting a dielectric sheet having an initial thickness of not more than about 4 mils, selecting two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate. forming the capacitor laminate with the one surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet has a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate the capacitor laminate being adapted for use with multiple devices respectively coupled to different portions of the capacitor laminate and the two conductive foils each have sufficient conductivity for facilitating operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from other portions of the capacitor laminate.
Claim 2
Independent Claim
182 words
A method for forming a capacitor laminate having laminated components and relatively high capacitance, comprising the steps of selecting a dielectric sheet having an initial thickness of not more than about 4 mils, selecting two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate. forming the capacitor laminate with the one surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet has a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate the capacitor laminate being adapted for use with multiple devices respectively coupled to different portions of the capacitor laminate and the two conductive foils each have sufficient conductivity for facilitating operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from other portions of the capacitor laminate.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein conductivity for each conductive foil is at least equivalent to about a 1 mil thickness of copper.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the dielectric sheet has an initial thickness of no more than about 2 mils.
Claim 5
Dependent Claim
17 words
The method of claim 2 wherein the dielectric sheet has an initial thickness of about 1-1.5 mils.
Claim 6
Dependent Claim
49 words
The method of claim 4 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 7
Dependent Claim
46 words
The method of claim 5 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 0.75-1.25 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 8
Dependent Claim
46 words
The method of claim 5 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 1 mil between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 9
Dependent Claim
33 words
The method of claim 7 wherein the other sides of the conductive foils are also surface treated to promote adhesion with one or more capacitor laminates being laminated within a printed circuit board.
Claim 10
Dependent Claim
17 words
The method of claim 8 wherein surface treatment is similar on both sides of each conductive foil.
Claim 11
Dependent Claim
49 words
The method of claim 8 wherein the other surface treated sides of the conductive foils have substantially greater surface roughness or surface variation than the one sides and further comprising the step of indexing the conductive foils to assure that their one sides are laminated to the dielectric sheet.
Claim 12
Dependent Claim
34 words
The method of claim 10 wherein the one side and the other side of each conductive foil correspond respectively to the so-called "barrel" side and "tooth" side of foil produced in an electrodeposition process.
Claim 13
Independent Claim
179 words
A method for forming a capacitor laminate having laminated components and relatively high capacitance, comprising the steps of selecting a dielectric sheet having an initial thickness of not more than about 4 mils, selecting two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, forming the capacitor laminate with the one surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet has a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate the dielectric sheet having an initial thickness of no more than about 2 mils, and the surface roughness or surface variation on the one surface treated side of each conductive foil being selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 14
Independent Claim
179 words
A method for forming a capacitor laminate having laminated components and relatively high capacitance, comprising the steps of selecting a dielectric sheet having an initial thickness of not more than about 4 mils, selecting two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, forming the capacitor laminate with the one surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet has a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate the dielectric sheet having an initial thickness of no more than about 2 mils, and the surface roughness or surface variation on the one surface treated side of each conductive foil being selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 15
Dependent Claim
33 words
The method of claim 12 wherein the other sides of the conductive foils are also surface treated to promote adhesion with one or more capacitor laminates being laminated within a printed circuit board.
Claim 16
Dependent Claim
17 words
The method of claim 12 wherein the dielectric sheet has an initial thickness of about 1-1.5 mils.
Claim 17
Dependent Claim
49 words
The method of claim 14 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 18
Dependent Claim
46 words
The method of claim 15 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 0.75-1.25 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 19
Dependent Claim
46 words
The method of claim 15 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 1 mil between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 20
Dependent Claim
187 words
A capacitor laminate formed from laminated components and having relatively high capacitance and comprising a dielectric sheet having an initial thickness of no more than about 4 mils, two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the capacitor laminate being formed from the dielectric sheet and the two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate and the capacitor laminate being adapted for use with multiple devices respectively coupled to different portions of the capacitor laminate and the two conductive foils each have sufficient conductivity for facilitating operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from the other portions of the capacitor laminate.
Claim 21
Dependent Claim
187 words
A capacitor laminate formed from laminated components and having relatively high capacitance and comprising a dielectric sheet having an initial thickness of no more than about 4 mils, two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the capacitor laminate being formed from the dielectric sheet and the two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate and the capacitor laminate being adapted for use with multiple devices respectively coupled to different portions of the capacitor laminate and the two conductive foils each have sufficient conductivity for facilitating operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from the other portions of the capacitor laminate.
Claim 22
Dependent Claim
24 words
The capacitor laminate of claim 18 wherein conductivity for each conductive foil is at least equivalent to about a 1 mil thickness of copper.
Claim 23
Dependent Claim
21 words
The capacitor laminate of claim 19 wherein the dielectric sheet has an initial thickness of no more than about 2 mils.
Claim 24
Dependent Claim
18 words
The capacitor laminate of claim 19 wherein the dielectric sheet has an initial thickness of about 1-1.5 mils.
Claim 25
Dependent Claim
50 words
The capacitor laminate of claim 21 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 26
Dependent Claim
47 words
The capacitor laminate of claim 22 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 0.75-1.25 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 27
Dependent Claim
47 words
The capacitor laminate of claim 22 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 1 mil between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 28
Dependent Claim
34 words
The capacitor laminate of claim 24 wherein the other sides of the conductive foils are also surface treated to promote adhesion with one or more capacitor laminates being laminated within a printed circuit board.
Claim 29
Dependent Claim
18 words
The capacitor laminate of claim 25 wherein surface treatment is similar on both sides of each conductive foil.
Claim 30
Dependent Claim
50 words
The capacitor laminate of claim 25 wherein the other surface treated sides of the conductive foils have substantially greater surface roughness or surface variation than the one sides and further comprising the step of indexing the conductive foils to assure that their one sides are laminated to the dielectric sheet.
Claim 31
Dependent Claim
35 words
The capacitor laminate of claim 27 wherein the one side and the other side of each conductive foil correspond respectively to the so-called "barrel" side and "tooth" side of foil produced in an electrodeposition process.
Claim 32
Dependent Claim
139 words
A capacitor laminate formed form laminated components and having relatively high capacitance and comprising a dielectric sheet having an initial thickness of no more than about 4 mils, two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the capacitor laminate being formed from the dielectric sheet and the two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate and, the dielectric sheet having an initial thickness of no more than about 2 mils.
Claim 33
Dependent Claim
139 words
A capacitor laminate formed form laminated components and having relatively high capacitance and comprising a dielectric sheet having an initial thickness of no more than about 4 mils, two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the capacitor laminate being formed from the dielectric sheet and the two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for maintaining adhesion and for developing enhanced capacitive integrity of the capacitor laminate and, the dielectric sheet having an initial thickness of no more than about 2 mils.
Claim 34
Dependent Claim
50 words
The capacitor laminate of claim 29 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 35
Dependent Claim
34 words
The capacitor laminate of claim 30 wherein the other sides of the conductive foils and also surface treated to promote adhesion with one or more capacitor laminates being laminated within a printed circuit board.
Claim 36
Dependent Claim
18 words
The capacitor laminate of claim 29 wherein the dielectric sheet has an initial thickness of about 1-1.5 mils.
Claim 37
Dependent Claim
50 words
The capacitor laminate of claim 32 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a minimum thickness of at least about 0.5 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 38
Dependent Claim
47 words
The capacitor laminate of claim 33 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 0.75-1.25 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 39
Dependent Claim
47 words
The capacitor laminate of claim 33 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 1 mil between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 40
Dependent Claim
202 words
A printed circuit board (PCB) comprising at least one capacitor laminate extending through a substantial area of the PCB and multiple devices respectively coupled to different portions of each capacitor laminate, each capacitor laminate including a dielectric sheet having an initial thickness of no more than about 4 mils, and two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the two conductive foils having sufficient conductivity for facilitating random operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from other portions of the capacitor laminate, the other sides of the conductive foils also being surface treated to promote adhesion of the capacitor laminates within the PCB, each capacitor laminate being formed from one dielectric sheet and two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for enhanced capacitive integrity of the capacitor laminate.
Claim 41
Dependent Claim
202 words
A printed circuit board (PCB) comprising at least one capacitor laminate extending through a substantial area of the PCB and multiple devices respectively coupled to different portions of each capacitor laminate, each capacitor laminate including a dielectric sheet having an initial thickness of no more than about 4 mils, and two conductive foils each having one surface treated side with surface roughness or surface variation just sufficient to promote adhesion of the one sides to the dielectric sheet in a resulting capacitor laminate, the two conductive foils having sufficient conductivity for facilitating random operation of the devices by providing each device with total capacitance including a proportional portion of the capacitor laminate and borrowed or shared capacitance from other portions of the capacitor laminate, the other sides of the conductive foils also being surface treated to promote adhesion of the capacitor laminates within the PCB, each capacitor laminate being formed from one dielectric sheet and two conductive foils with the surface treated sides of the conductive foils in intimate contact with opposite sides of the dielectric sheet whereby the dielectric sheet is a minimum thickness between all opposing surface portions of the conductive foils for enhanced capacitive integrity of the capacitor laminate.
Claim 42
Dependent Claim
23 words
The PCB of claim 36 wherein conductivity for each conductive foil is at least equivalent to about a 1 mil thickness of copper.
Claim 43
Dependent Claim
20 words
The PCB of claim 37 wherein the dielectric sheet has an initial thickness of no more than about 2 mils.
Claim 44
Dependent Claim
17 words
The PCB of claim 37 wherein the dielectric sheet has an initial thickness of about 1-1.5 mils.
Claim 45
Dependent Claim
46 words
The PCB of claim 37 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 0.75-1.25 mils between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 46
Dependent Claim
46 words
The PCB of claim 37 wherein the surface roughness or surface variation on the one surface treated side of each conductive foil is selected for maintaining a thickness of about 1 mil between all opposing surface portions of the conductive foils in the formed capacitor laminate.
Claim 47
Dependent Claim
17 words
The PCB of claim 36 wherein surface treatment is similar on both sides of each conductive foil.
Claim 48
Dependent Claim
49 words
The PCB of claim 36 wherein the other surface treated sides of the conductive foils have substantially greater surface roughness or surface variation than the one sides and further comprising the step of indexing the conductive foils to assure that their one sides are laminated to the dielectric sheet.
Claim 49
Dependent Claim
32 words
The PCB of claim 43 wherein the one side and the other side of each conductive foil are the so-called "barrel" side and "tooth" side of foil produced in an electrodeposition process.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |