US6055151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer ceramic circuit boards including embedded components
Assignee: Sharp Corp
•
Filing: 1998-02-27
•
Granted: 2000-04-25
•
Expires: 2018-02-27
Abstract
Abstract Embedded passive components such as capacitors are formed in multilayer ceramic circuit boards by screen printing a component precursor compound ink sandwiched between conductor ink layers onto a green tape stack and covering the component ink layer with one or two green tape layers, aligning and laminating the green tapes and firing. Capacitor inks are made from dielectrics chosen from barium titanate, titanium oxide and lead-magnesium-niobate. The green tapes are made of a mixture of a crystallizing glass, a non-crystallizing glass and an oxide filler which does not shrink in the x and y dimensions during firing mounted on a metal support. Thus the embedded components can be made to close tolerances.
Inventors
- 👤 Ellen Schwartz Tormey
- 👤 Ashok Narayan Prabhu
- 👤 Attiganal Narayanaswamy Sreeram
- 👤 Michael James Liberatore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:10
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/003; H01C13/00; H01C13/02; H01C17/00; H01C17/30; H05; H05K; H05K1/00; H05K1/16; H05K1/162; H05K1/167; H10; H10W; H10W44/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; H05K3/4688; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49128
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
50 words
A capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium niobate, a low firing temperature glass that includes less than 2% of barium oxide and an organic vehicle in an amount sufficient to screen print the ink onto a ceramic green tape.
Claim 2
Dependent Claim
50 words
A capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium niobate, a low firing temperature glass that includes less than 2% of barium oxide and an organic vehicle in an amount sufficient to screen print the ink onto a ceramic green tape.
Claim 3
Dependent Claim
24 words
A capacitor ink according to claim 1, wherein the dielectric is barium titanate mixed with said low firing temperature glass and an organic vehicle.
Claim 4
Dependent Claim
15 words
A capacitor ink according to claim 2, further including a temperature coefficient of capacitance modifier.
Claim 5
Dependent Claim
18 words
A capacitor ink according to claim 3, wherein the temperature coefficient of capacitance modifier is SrZrO 3 .
Claim 6
Dependent Claim
13 words
A capacitor ink according to claim 1, wherein the dielectric is titanium oxide.
Claim 7
Dependent Claim
12 words
A capacitor ink according to claim 1, wherein the dielectric is lead-magnesium-niobate.
Claim 8
Dependent Claim
118 words
A multilayer ceramic green tape structure comprising a plurality of low firing temperature green tapes that do not shrink in the x and y dimensions during firing having circuit patterns thereon mounted on a metal support substrate, a capacitor layer screen printed on one of said green tape layers from a capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate, a low firing temperature glass that includes less than 2% of barium oxide, and an organic vehicle in sufficient amount to permit screen printing of the capacitor ink, one or two layers below the top green tape, and a silver conductor layer screen printed above and below the capacitor layer.
Claim 9
Dependent Claim
118 words
A multilayer ceramic green tape structure comprising a plurality of low firing temperature green tapes that do not shrink in the x and y dimensions during firing having circuit patterns thereon mounted on a metal support substrate, a capacitor layer screen printed on one of said green tape layers from a capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate, a low firing temperature glass that includes less than 2% of barium oxide, and an organic vehicle in sufficient amount to permit screen printing of the capacitor ink, one or two layers below the top green tape, and a silver conductor layer screen printed above and below the capacitor layer.
Claim 10
Dependent Claim
14 words
A green tape structure according to claim 7, wherein said dielectric is barium titanate.
Claim 11
Dependent Claim
24 words
A green tape structure according to claim 8, wherein said silver conductive layer is made from a mixture of silver powder and silver flake.
Claim 12
Dependent Claim
14 words
A green tape structure according to claim 7, wherein said dielectric is titanium oxide.
Claim 13
Dependent Claim
13 words
A green tape structure according to claim 7, wherein said dielectric is lead-magnesium-niobate.
Claim 14
Dependent Claim
37 words
A green tape structure according to claim 11, wherein said capacitor layer is sandwiched between two barium titanate barrier layers having a thickness sufficient to prevent diffusion of the low firing temperature glass of the green tapes.
Claim 15
Dependent Claim
16 words
A green tape structure according to claim 12, wherein said thickness is at least 16 microns.
Claim 16
Dependent Claim
20 words
A green tape layer according to claim 7, wherein said metal support is made of an iron nickel cobalt-maganese alloy.
Claim 17
Dependent Claim
100 words
A supported ceramic circuit board including buried capacitors comprising: a) a laminated green tape stack of low firing temperature glass, having screen printed circuits thereon on an iron-nickel-cobalt-manganese alloy support; b) a buried screen printed capacitor layer made from a capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate, a low firing temperature glass and an organic vehicle in an amount sufficient to permit screen printing thereof; c) a silver conductor layer screen printed below and above the capacitor layer; and d) an overlying green tape layer of low firing temperature glass.
Claim 18
Dependent Claim
100 words
A supported ceramic circuit board including buried capacitors comprising: a) a laminated green tape stack of low firing temperature glass, having screen printed circuits thereon on an iron-nickel-cobalt-manganese alloy support; b) a buried screen printed capacitor layer made from a capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate, a low firing temperature glass and an organic vehicle in an amount sufficient to permit screen printing thereof; c) a silver conductor layer screen printed below and above the capacitor layer; and d) an overlying green tape layer of low firing temperature glass.
Claim 19
Dependent Claim
17 words
A supported ceramic circuit board according to claim 15, wherein said dielectric is made from barium titanate.
Claim 20
Dependent Claim
22 words
A supported ceramic circuit board according to claim 16, wherein a thermal coefficient of capacitance modifier is added to said barium titanate.
Claim 21
Dependent Claim
17 words
A supported ceramic circuit board according to claim 15, wherein said dielectric is made from titanium oxide.
Claim 22
Dependent Claim
16 words
A supported ceramic circuit board according to claim 15, wherein said dielectric is made from lead-magnesium-niobate.
Claim 23
Dependent Claim
40 words
A supported ceramic circuit board according to claim 15, wherein said capacitor is sandwiched between two barium titanate barrier layers of sufficient thickness so as to prevent diffusion of the glasses of the glass green tapes into the capacitor layer.
Claim 24
Dependent Claim
85 words
A supported ceramic circuit board having buried capacitors comprising a) a laminated green tape stack on an iron-nickel-cobalt-manganese alloy support; b) a buried screen printed capacitor layer made from a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate; c) a silver conductor layer screen printed below and above the capacitor layer; and d) an overlying green tape layer, wherein said capacitor is sandwiched between silver barrier layers, said barrier layers comprised of a mixture of silver powder and silver flake.
Claim 25
Dependent Claim
85 words
A supported ceramic circuit board having buried capacitors comprising a) a laminated green tape stack on an iron-nickel-cobalt-manganese alloy support; b) a buried screen printed capacitor layer made from a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate; c) a silver conductor layer screen printed below and above the capacitor layer; and d) an overlying green tape layer, wherein said capacitor is sandwiched between silver barrier layers, said barrier layers comprised of a mixture of silver powder and silver flake.
Claim 26
Dependent Claim
7 words
A fired circuit board of claim 15.
Claim 27
Dependent Claim
7 words
A fired circuit board of claim 16.
Claim 28
Dependent Claim
7 words
A fired circuit board of claim 18.
Claim 29
Dependent Claim
7 words
A fired circuit board of claim 19.
References Cited (Backward Citations)
US3878443A
Cited
US3968412A
Cited
US4061584A
Cited
US4120677A
Cited
US4450240A
Cited
US4882652A
Cited
US4845839A
Cited
US5059566A
Cited
US5004715A
Cited
US5256469A
Cited
US5581876A
Cited
US5680685A
Cited
US5708570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-25 | 2003-10-25 | 2004-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-25 | 2007-10-25 | 2008-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-25 | 2011-10-25 | 2012-04-25 | $7700.00 | Window Closed / Lapsed |