Patent EP0276004A2 successfully refreshed from Google Patents.
EP0276004A2
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EP
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Multilayer ceramic substrate and method for making the same
Assignee: Panasonic Holdings Corp
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Filing: 1988-01-21
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Granted: —
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Expires: 2008-01-21
Abstract
Abstract A multilayer ceramic substrate comprises several conductive layers and at least one insulating layer therefor, whereby the insulating layer is formed from an inorganic composition comprising: - at least one member selected from Al₂O₃ and ZrO₂; together with a mixture of SiO₂, PbO and at least one member selected from the group of BaO, CaO and ZnO. The multilayer ceramic substrate can be sintered at low temperature in air resulting in the desired properties of heat resistance, solderability, insulation layer resistance and avoidance of microcrack formation when laser trimming a top resistance film.
Inventors
- 👤 Koichi Kumagai
- 👤 Shinji Shimazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; C; C03; C03C; C03C14/00; C03C14/004; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C03C2214/00; C03C2214/04; H05K1/09; H05K1/092; H05K1/16; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31815
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A multilayer ceramic substrate comprising: at least two conductive layers, at least one insulation layer for insulating said conductive layers comprising the following members calculated as oxide: at least one member selected from the group consisting of Al₂O₃ and ZrO₂ of 32--58 % by weight, SiO₂ of 13--30 % by weight, PbO of 15--39 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 0.5--12 % by weight.
Claim 2
Dependent Claim
77 words
A multilayer ceramic substrate comprising: at least two conductive layers, at least one insulation layer for insulating said conductive layers comprising the following members calculated as oxide: at least one member selected from the group consisting of Al₂O₃ and ZrO₂ of 32--58 % by weight, SiO₂ of 13--30 % by weight, PbO of 15--39 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 0.5--12 % by weight.
Claim 3
Dependent Claim
77 words
A multilayer ceramic substrate comprising: at least two conductive layers, and at least one insulation layer for insulating said conductive layers comprising the following members calculated as oxide: at least one member selected from the group consisting of Al₂O₃ ZrO₂ of 39--51 % by weight, SiO₂ of 19--25 % by weight, PbO of 22--32 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 2--8 % by weight.
Claim 4
Dependent Claim
77 words
A multilayer ceramic substrate comprising: at least two conductive layers, and at least one insulation layer for insulating said conductive layers comprising the following members calculated as oxide: at least one member selected from the group consisting of Al₂O₃ ZrO₂ of 39--51 % by weight, SiO₂ of 19--25 % by weight, PbO of 22--32 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 2--8 % by weight.
Claim 5
Dependent Claim
33 words
A multilayer ceramic substrate in accordance with claim 1 or 2, wherein, said conductive layer is made of at least one metal selected from the group consisting of Ag, Au, Pd and Pt.
Claim 6
Dependent Claim
39 words
A multilayer ceramic substrate in accordance with claim 1 or 2, wherein said conductive layer is made of at least one alloy made of at least two members selected from the group consisting of Ag, Au, Pd, and Pt.
Claim 7
Dependent Claim
32 words
A multilayer ceramic substrate in accordance with claim 1 or 2, wherein a top resistance layer or a top conductive layer are further formed on a surface of said multilayer ceramic substrate.
Claim 8
Dependent Claim
26 words
A multilayer ceramic substrate in accordance with claim 1 or 2, wherein a top resistance layer trimmed by laser is formed on said multilayer ceramic substrate.
Claim 9
Independent Claim
116 words
A method for making a multilayer ceramic substrate comprising steps of: preparing a slurry by mixing a binder and a composition comprising at least one member selected from the group consisting of Al₂O₃ and ZnO₂ of 39--51 % by weight, SiO₂ of 19--25 % by weight, PbO of 22--32 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 2--8 % by weight, preparing plural green sheets from said slurry, providing via-holes in said green sheets, packing a conductive material into said via-holes, printing a conductive layer on said green sheets, drying said conductive layer, laminating said green sheets with pressure and sintering said laminated green sheets.
Claim 10
Independent Claim
116 words
A method for making a multilayer ceramic substrate comprising steps of: preparing a slurry by mixing a binder and a composition comprising at least one member selected from the group consisting of Al₂O₃ and ZnO₂ of 39--51 % by weight, SiO₂ of 19--25 % by weight, PbO of 22--32 % by weight and at least one member selected from the group consisting of BaO, CaO and ZnO of 2--8 % by weight, preparing plural green sheets from said slurry, providing via-holes in said green sheets, packing a conductive material into said via-holes, printing a conductive layer on said green sheets, drying said conductive layer, laminating said green sheets with pressure and sintering said laminated green sheets.
Claim 11
Dependent Claim
23 words
A method for making a multilayer ceramic substrate in accordance with claim 7, wherein said slurry is prepared by using a ball mill.
Claim 12
Dependent Claim
22 words
A method for making a multilayer ceramic substrate in accordance with claim 7, wherein said slurry is prepared by a doctor-blade method.
Claim 13
Dependent Claim
44 words
A method for making a multilayer ceramic substrate in accordance with claim 7, wherein said conductive material is made of one member selected from the group consisting of Ag, Au, Pd and Pt, and is packed into said via-holes by using a metal mask.
Claim 14
Dependent Claim
50 words
A method for making a multilayer ceramic substrate in accordance with claim 7, wherein said conductive material is made of an alloy made of at least two members selected from the group consisting of Ag, Au, Pd or Pt, and is packed into said via-holes by using a metal mask.
Claim 15
Dependent Claim
28 words
A method for making a multilayer ceramic substrate in accordance with claim 7, wherein said green sheets having said dried conductive layer are laminated while they are warm.
References Cited (Backward Citations)
No citation records indexed.
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