US4821142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic multilayer circuit board and semiconductor module
Assignee: Hitachi Ltd
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Filing: 1987-06-04
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Granted: 1989-04-11
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Expires: 2007-06-04
Abstract
Abstract A ceramic multilayer circuit board comprising ceramic layers and wiring conductor layers laminated alternately, in which the ceramic layer has a thermal expansion coefficient lower than that of the wiring conductor and not lower than one half of that of the conductor layer and is formed from a glass which softens at a temperature not higher than the melting point of the wiring conductor layer; a semiconductor module having a high reliability in its solder joint part comprising said ceramic multilayer circuit board mounted with a ceramic carrier substrate being mounted with a semiconductor device, said board being able to use a silver or copper conductor having a good electro-conductivity; and an amorphous glass powder for said ceramic multilayer circuit board.
Inventors
- 👤 Nobuyuki Ushifusa
- 👤 Hiroichi Shinohara
- 👤 Kousei Nagayama
- 👤 Satoru Ogihara
- 👤 Tasao Soga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:01
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C03C3/076; C03C3/089; C03C3/091; C03C3/093; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W90/00; H10W90/401; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; H10W74/00; H10W74/10; H10W74/15; H10W90/701; H10W90/721; H10W90/724; H10W90/731; H10W90/734; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49158; Y10T29/4916
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
A ceramic multilayer circuit board comprising ceramic layers and wiring conductor layers laminated alternately, in which the ceramic layers are formed from a glass which consists essentially of 20 to 85% of SiO 2 and at least one member selected from 25% or less of Al 2 O 3 , 1 to 25% of MgO, 50% or less of B 2 O 3 , 15 to 25% of ZnO, 10 to 25% of CaO, 2 to 20% of Li 2 O, 10% or less of K 2 O, 50 to 60% AlPO 4 , 25 to 35% Y 2 O 3 , 5% or less of P 2 O 5 , 5% or less of ZrO 2 , 5% or less of CaF 2 , 6% or less of AlN, 5% or less of Cs 2 O, and 5% or less of V 2 O 5 , each by weight, and which softens at a temperature not higher than the melting point of the wiring conductor layer and wherein the ceramic layer has a thermal expansion coefficient lower than that of the wiring layer but not lower than one half that of the wiring layer.
Claim 2
Dependent Claim
195 words
A ceramic multilayer circuit board comprising ceramic layers and wiring conductor layers laminated alternately, in which the ceramic layers are formed from a glass which consists essentially of 20 to 85% of SiO 2 and at least one member selected from 25% or less of Al 2 O 3 , 1 to 25% of MgO, 50% or less of B 2 O 3 , 15 to 25% of ZnO, 10 to 25% of CaO, 2 to 20% of Li 2 O, 10% or less of K 2 O, 50 to 60% AlPO 4 , 25 to 35% Y 2 O 3 , 5% or less of P 2 O 5 , 5% or less of ZrO 2 , 5% or less of CaF 2 , 6% or less of AlN, 5% or less of Cs 2 O, and 5% or less of V 2 O 5 , each by weight, and which softens at a temperature not higher than the melting point of the wiring conductor layer and wherein the ceramic layer has a thermal expansion coefficient lower than that of the wiring layer but not lower than one half that of the wiring layer.
Claim 3
Dependent Claim
54 words
A ceramic multilayer circuit board according to claim 1, wherein said ceramic layers are formed from a glass consisting essentially of 75 to 85% SiO 2 , 2 to 6% Al 2 O 3 , 10 to 15% Li 2 O, 2 to 3% K 2 O, and 1 to 3% CaF 2 .
Claim 4
Dependent Claim
50 words
A ceramic multilayer circuit board according to claim 1, wherein the ceramic layer has a thermal expansion coefficient not lower than 7.2×10 -6 /°C. and a specific dielectric constant at 1 MHz not higher than 4.5, and the wiring conductor layer is formed from either gold, or silver, or copper.
Claim 5
Dependent Claim
74 words
A ceramic multilayer circuit board comprising ceramic layers and wiring conductor layers laminated alternately, in which the ceramic layer has a thermal expansion coefficient lower than, and not lower than one half of, that of the wiring conductor layer, and further comprises hollow silica having a particle diameter of not more than 100 μm dispersed in a glass which softens at a temperature not higher than the melting point of the wiring conductor layer.
Claim 6
Dependent Claim
74 words
A ceramic multilayer circuit board comprising ceramic layers and wiring conductor layers laminated alternately, in which the ceramic layer has a thermal expansion coefficient lower than, and not lower than one half of, that of the wiring conductor layer, and further comprises hollow silica having a particle diameter of not more than 100 μm dispersed in a glass which softens at a temperature not higher than the melting point of the wiring conductor layer.
Claim 7
Dependent Claim
28 words
A ceramic multilayer circuit board according to claim 4, wherein the content of said hollow silica microsphered is 35 to 60% by volume relative to the ceramic layer.
Claim 8
Dependent Claim
92 words
A semiconductor module comprising a ceramic multilayer circuit board mounted with a ceramic carrier substrate, said carrier substrate being mounted with a semiconductor device, in which the carrier substrate and the multilayer circuit board each comprise ceramic layers and wiring conductor layers laminated alternately, and the ceramic layer has a thermal expansion coefficient lower than, and not lower than one half of, that of the wiring conductor layer and further the ceramic layer comprises a glass which softens at a temperature not higher than the melting point of the wiring conductor layer.
Claim 9
Dependent Claim
92 words
A semiconductor module comprising a ceramic multilayer circuit board mounted with a ceramic carrier substrate, said carrier substrate being mounted with a semiconductor device, in which the carrier substrate and the multilayer circuit board each comprise ceramic layers and wiring conductor layers laminated alternately, and the ceramic layer has a thermal expansion coefficient lower than, and not lower than one half of, that of the wiring conductor layer and further the ceramic layer comprises a glass which softens at a temperature not higher than the melting point of the wiring conductor layer.
Claim 10
Dependent Claim
32 words
A semiconductor module according to claim 6, wherein the ceramic carrier substrate and the semiconductor device are joined by means of solder bump, said solder bump being covered with an organic resin.
Claim 11
Dependent Claim
37 words
A semiconductor module according to claim 7, wherein the organic resin comprises 100 parts by weight of said resin, 5 to 10 parts by weight of rubber particles, and 35 to 60% by volume of ceramic powders.
Claim 12
Dependent Claim
45 words
A semiconductor module according to claim 8, wheren the rubber particle comprises at least one member selected from polybutadiene and silicone rubber, and the ceramic powder comprises at least one member selected from quartz, silicon carbide, silicon nitride, calcium carbonate, and silicon carbide containing beryllium.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |