WO2006051821A1 - セラミック多層基板およびその製造方法 - Google Patents
セラミック多層基板およびその製造方法 Download PDFInfo
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- WO2006051821A1 WO2006051821A1 PCT/JP2005/020550 JP2005020550W WO2006051821A1 WO 2006051821 A1 WO2006051821 A1 WO 2006051821A1 JP 2005020550 W JP2005020550 W JP 2005020550W WO 2006051821 A1 WO2006051821 A1 WO 2006051821A1
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- Prior art keywords
- conductor
- ceramic
- hole conductor
- stud
- main surface
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
- H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
- H05K1/113—Via provided in pad; Pad over filled via
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/096—Vertically aligned vias, holes or stacked vias
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0703—Plating
- H05K2203/0733—Method for plating stud vias, i.e. massive vias formed by plating the bottom of a hole without plating on the walls
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4614—Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
- H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
Definitions
- the present invention relates to a surface-mounting ceramic multilayer substrate having terminal electrodes and a method for manufacturing the same, and more particularly, improvement of reliability of terminal electrodes and improvement of mounting reliability to a mounting substrate to be mounted.
- the present invention relates to a ceramic multilayer substrate and a manufacturing method thereof. Background art
- This ceramic multilayer substrate is usually obtained by a method such as reflow soldering to a land electrode formed on a mounting substrate via a terminal electrode formed on a surface facing the mounting substrate to be mounted.
- the mounting is performed by being electrically and mechanically connected.
- the first method is “a thick film pattern (terminal electrode pattern) to be a terminal electrode formed on the surface of a fired ceramic multilayer substrate by screen printing of a conductive paste, and then baking this (post method fire method) ".
- the second method is that “a thick film pattern (terminal electrode pattern) to be a terminal electrode is formed on a ceramic green sheet by a method such as screen printing of a conductive paste.
- the ceramic green sheets provided are stacked with other ceramic green sheets and pressure-bonded, and the obtained unfired ceramic laminate is collectively fired (cofired) (cofire method).
- the bonding strength between the terminal electrode and the ceramic laminate constituting the ceramic multilayer substrate is increased. Therefore, when an additive such as glass or ceramic laminate constituent material (ceramic powder) is added to the terminal electrode forming material, the terminal electrode is joined to the ceramic laminate constituting the ceramic multilayer substrate. Although it is possible to increase the strength, there are problems that the resistivity of the terminal electrode increases and the solder wettability decreases.
- the ceramic green sheet and the terminal electrode pattern are fired simultaneously, the fired ceramic laminate and the terminal electrode are firmly connected.
- the ceramic green sheet and the terminal electrode pattern are integrally crimped, so the surface of the terminal electrode pattern formed on the surface of the unfired ceramic laminate is the surface of the unfired ceramic laminate.
- the surface of the terminal electrode is flush with the surface of the ceramic multilayer substrate.
- the gap between the ceramic multilayer board and the mounting board is as narrow as the thickness of the solder for joining, so if the mounting board bends, the surface of the ceramic multilayer board (The surface facing the mounting board) and the surface of the mounting board abut, stress is applied to the ceramic multilayer board, and a crack is generated between the terminal electrode and the ceramic multilayer body constituting the ceramic multilayer board. In some cases, the problem arises that the ceramic multilayer substrate falls off the mounting substrate.
- At least a part of the shape of the via-hole conductor 52 connected to the signal input / output pad 51 has a truncated cone shape (cross section).
- a ceramic multilayer substrate is known which has a trapezoidal shape and improves the adhesion strength of the terminal electrode 53 comprising the signal input / output pad 51 and the via-hole conductor 52 to the ceramic laminate 54 (Patent Document 1). .
- the surface of the terminal electrode is substantially flush with the surface of the ceramic multilayer substrate (Patent Document 1).
- the terminal electrode is described as having a certain thickness, but the actual thickness is thin, and the surface of the terminal electrode is substantially the same as the surface of the ceramic multilayer substrate. Therefore, when the mounting board is pinched when it is mounted on the mounting board, the surface of the ceramic multilayer board (the surface facing the mounting board) and the surface of the mounting board come into contact with each other, and the ceramic multilayer board In fact, the problem of stress being applied to the surface has not been solved.
- Patent Document 1 JP-A-5-55402
- the present invention solves the above-described problems, and the bonding strength (connection strength) between the terminal electrode and the ceramic laminate constituting the ceramic multilayer substrate is increased, and the ceramic multilayer substrate is mounted.
- a ceramic multilayer substrate and a method for manufacturing the same that can suppress or prevent the ceramic multilayer substrate from being damaged or dropped even when the mounting substrate is sagged. The purpose is to provide.
- the ceramic multilayer substrate of the present invention (Claim 1)
- a ceramic laminate comprising a plurality of laminated ceramic layers
- the ceramic multilayer substrate provided with a terminal electrode for connection to the mounting substrate formed on the first main surface facing the mounting substrate when mounting the ceramic laminate
- the terminal electrode is (a) a stud conductor disposed on the first main surface in such a manner as to protrude from the first main surface of the ceramic laminate; (b) the circuit element; and the stud conductor; A connecting conductor comprising a via-hole conductor disposed inside the ceramic laminate,
- the conductor having the smaller planar area on the first major surface is within the region formed on the first major surface by the conductor having the larger planar area on the first major surface. Configured to include substantially the entire region to be formed, and
- a constricted region which is a small area with a smaller planar area than the first principal surface side region and the inner layer side region, is disposed. It is characterized by.
- connection conductor constituting the terminal electrode is disposed so as to be exposed to the first main surface of the ceramic laminate, and the exposed surface A first via-hole conductor joined to the stud conductor; and (b) a second via-hole conductor located on the inner layer side of the first via-hole conductor and joined to the first via-hole conductor.
- the planar area of the two via hole conductors is larger than the planar area of the first via hole conductor.
- connection conductor constituting the terminal electrode is:
- the planar area of the central conductor is smaller than the planar area of the conductors on both sides thereof
- connection conductor constituting the terminal electrode is disposed so as to be exposed to the first main surface of the ceramic laminate, and the exposed surface And (b) a second via-hole conductor that is located on an inner layer side of the first via-hole conductor and is joined to the first via-hole conductor; and (c) the first via-hole conductor that is joined to the first via-hole conductor.
- a third via hole conductor located on the inner layer side of the via hole conductor and joined to the second via hole conductor, and the planar area of the third via hole conductor is larger than the planar area of the first and second via hole conductors
- the planar area of the stud conductor is larger than the planar area of the first via-hole conductor.
- connection conductor constituting the terminal electrode is disposed so as to be exposed to the first main surface of the ceramic laminate, and the exposed surface (B) a second via hole conductor that is located on the inner layer side of the first via hole conductor and is joined to the first via hole conductor; and (c) ) A third via-hole conductor located on the inner layer side of the second via-hole conductor and joined to the second via-hole conductor, the planar area of the second via-hole conductor being the planar area of the first and third via-hole conductors It is characterized by being smaller than.
- the ceramic multilayer substrate according to claim 6 is characterized in that the via hole conductor force includes a substantially inverted truncated cone-shaped portion when the first main surface is a lower surface.
- the ceramic multilayer substrate according to claim 7 has a plurality of substantially frustoconical shapes in which the via-hole conductor is disposed so as to overlap in the stacking direction of the ceramic layers when the first main surface is the lower surface. It is characterized by including a via-shaped conductor.
- the ceramic multilayer substrate according to claim 8 is characterized in that the stud conductor and the via-hole conductor are integrated by force simultaneous firing.
- the ceramic multilayer substrate according to claim 9 is characterized in that a height of a portion of the stud conductor protruding from the first main surface of the ceramic laminate is 10 ⁇ m or more.
- a plurality of the stud conductors are formed in a peripheral portion of the first main surface of the ceramic laminate, and are surrounded by the plurality of stud conductors.
- the electronic component is mounted, and the electronic component is sealed with resin together with the stud conductor.
- the method for producing a ceramic multilayer substrate of the present invention includes:
- a ceramic multilayer substrate having a circuit element disposed therein and having a terminal electrode on a first main surface of a ceramic laminate facing the mounting substrate at the time of mounting, wherein the terminal electrode comprises: (a) the ceramic laminate A stud conductor disposed on the first main surface in such a manner as to protrude from the first main surface, and (b) a connection conductor connecting the circuit element and the stud conductor, the ceramic laminate A connection conductor made of a via hole conductor disposed inside the body, and formed on the first main surface by a conductor having a larger planar area on the first main surface of the via hole conductor and the stud conductor.
- the region formed by the conductor having the smaller planar area on the first main surface is included, and the connection conductor of the terminal electrodes, or The stud conductor and the connection A small area having a smaller planar area than the first main surface side region and the inner layer side region when viewed from the first main surface of the ceramic laminate toward the inner layer side of the ceramic laminate at the boundary of the body Part A method of manufacturing a ceramic multilayer substrate in which a constricted region is disposed,
- a shrinkage-suppressing layer comprising as a main component a ceramic that is disposed on the surface to be the first main surface of the green ceramic laminate and that does not substantially sinter at the sintering temperature of the green ceramic layer;
- An unfired stud conductor disposed in the shrinkage suppression layer so that one surface is in contact with the surface to be the first main surface of the unfired ceramic laminate;
- the ceramic multilayer substrate of the present invention (Claim 1) is mounted at the time of mounting a ceramic laminate composed of a plurality of laminated ceramic layers, circuit elements disposed in the ceramic laminate, and the ceramic laminate.
- a ceramic multilayer substrate provided with a terminal electrode for connection to a mounting substrate formed on the first main surface facing the substrate, the terminal electrode protrudes from the first main surface of the ceramic laminate (a) A stud conductor disposed on the first main surface in such a manner, and (b) a connection conductor connecting the circuit element and the stud conductor, the via hole disposed within the ceramic laminate.
- connection conductor made of a conductor, and a plane on the first main surface within a region formed on the first main surface by a conductor having a larger plane area on the first main surface of the via hole conductor and the stud conductor.
- the conductor with the smaller area It is configured to include substantially the entire region to be formed, and from the first main surface side of the ceramic laminate to the connection conductor or the boundary between the stud conductor and the connection conductor of the terminal electrode.
- the first main surface side region and the inner layer side region have a smaller plane area and a constricted region that is a smaller area, so the terminal electrode and the ceramic multilayer It is possible to increase the bonding strength (connection strength) with the ceramic laminate that constitutes the board, and when the ceramic multilayer board is mounted on the mounting board, the ceramics can also be It is possible to provide a highly reliable ceramic multilayer substrate capable of suppressing and preventing the multilayer substrate from being stressed and causing damage or dropout of the ceramic multilayer substrate.
- the electrode material has a high content of conductive components that do not contain additives such as glass. It becomes possible to use a material, and it is possible to form a terminal electrode having good solder wettability and high conductivity after firing.
- the first main surface of the ceramic laminate disposed at the boundary between the connection conductor or the stud conductor and the connection conductor among the terminal electrodes.
- the first principal surface side region and the constricted region which is a small area portion having a smaller planar area than the inner layer side region, are securely connected to the ceramic layers constituting the ceramic laminate. It is possible to improve the coupling strength (connection strength) between the terminal electrode and the ceramic laminate, and the first main surface force of the ceramic laminate is connected to the protruding stud conductor of the ceramic multilayer substrate.
- a gap corresponding to the thickness of the stud conductor can be secured between the first main surface and the mounting board.
- the ceramic multilayer substrate is damaged or dropped due to stress applied to the ceramic multilayer substrate. Therefore, it is possible to obtain a highly reliable ceramic multilayer substrate capable of suppressing and preventing the occurrence of stagnation.
- connection conductor constituting the terminal electrode is disposed so as to be exposed on the first main surface of the ceramic laminate (a), and on the exposed surface A first via hole conductor joined to the stud conductor; and (b) a second via hole conductor located on the inner layer side of the first via hole conductor and joined to the first via hole conductor.
- the planar area of the conductor is larger than the planar area of the first via-hole conductor. If this is done, the step of the second via-hole conductor and the first via-hole conductor can prevent the connecting conductor from falling out, thereby improving the coupling strength (connection strength) between the terminal electrode and the ceramic laminate. This makes it possible to obtain a highly reliable ceramic multilayer substrate.
- connection conductor constituting the terminal electrode is disposed so as to be exposed on the first surface of the ceramic laminate (a).
- the third via hole conductor joined to the second via hole conductor, and the planar area of the central conductor of any one of the three consecutive conductors of the stud conductor and the via hole conductor constituting the terminal electrode is Therefore, the terminal electrode surely holds the ceramic layer constituting the ceramic laminate, and the gap between the terminal electrode and the ceramic laminate is reduced. Bond strength it is possible to reliably obtain a high ceramic multilayer substrate having excellent reliability (the connection strength).
- connection conductor constituting the terminal electrode is disposed so as to be exposed on the first main surface of the ceramic laminate (a), and on the exposed surface A first via hole conductor joined to the stud conductor; (b) a second via hole conductor located on the inner layer side of the first via hole conductor and joined to the first via hole conductor; and (c) an inner layer of the second via hole conductor.
- a third via-hole conductor located on the side and joined to the second via-hole conductor, the planar area of the third via-hole conductor being larger than the planar area of the first and second via-hole conductors, and the planar surface of the stud conductor Area force
- the step portion of the third via-hole conductor and the second via-hole conductor serves to prevent the connecting conductor from falling off.
- the bond strength (connection strength) between the child electrode and the ceramic laminate can be improved, and the planar area of the stud conductor is larger than the planar area of the first via-hole conductor.
- connection conductor constituting the terminal electrode is disposed so as to be exposed on the first main surface of the ceramic laminate (a), and on the exposed surface A first via hole conductor joined to the stud conductor; (b) a second via hole conductor located on the inner layer side of the first via hole conductor and joined to the first via hole conductor; and (c) an inner layer of the second via hole conductor.
- a third via hole conductor that is joined to the second via hole conductor and is configured such that the planar area of the second via hole conductor is smaller than the planar area of the first and third via hole conductors. If at least the step portion of the third via hole conductor and the second via hole conductor serves to prevent the connecting conductor from falling off, the coupling strength (connection strength) between the terminal electrode and the ceramic laminate is ensured. Since the tad conductor protrudes from the first main surface of the ceramic laminate, the mounting surface of the mounting substrate and the first main surface of the ceramic multilayer substrate are in contact with each other even when the mounting substrate stagnates. It is possible to suppress and prevent the ceramic multilayer substrate from being damaged and falling off due to stress applied to the ceramic multilayer substrate.
- the via-hole conductor when the via-hole conductor includes a substantially inverted frustoconical portion when the first main surface is a lower surface, the first main body of the ceramic laminate is provided. It becomes possible to easily and reliably realize a via-hole conductor having a portion whose plane area continuously increases from the surface toward the inner layer side of the ceramic laminate, and the bonding strength between the terminal electrode and the ceramic laminate It is possible to reliably obtain a ceramic multilayer substrate with excellent (connection strength).
- the plurality of substantially frustoconical shapes in which the via-hole conductor is disposed so as to overlap in the stacking direction of the ceramic layers when the first main surface is the lower surface. If there are multiple via-hole conductors, a via-hole conductor having multiple portions with a continuously increasing planar area from the first main surface of the ceramic laminate toward the inner layer of the ceramic laminate can be realized easily and reliably. It becomes possible to make the present invention more effective.
- the ceramic multilayer substrate of claim 8 when the stud conductor and the via-hole conductor are integrated by simultaneous firing, the mechanical strength is excellent and the electrical connection reliability is high. It becomes possible to manufacture a ceramic multilayer substrate having a high terminal electrode.
- the ceramic multilayer substrate of claim 9 when the height of the portion of the stud conductor protruding from the first main surface of the ceramic laminate is 10 ⁇ or more, the mounting substrate is bent. In this case, the mounting surface of the mounting substrate and the first main surface of the ceramic multilayer substrate are prevented from coming into contact with each other, and stress is applied to the ceramic multilayer substrate, which may cause damage or dropout of the ceramic multilayer substrate. It becomes possible to suppress and prevent.
- the plurality of stud conductors are formed on the peripheral edge portion of the first main surface of the ceramic multilayer body, and the electronic component is formed in a region surrounded by the plurality of stud conductors. It is possible to use a region surrounded by a plurality of stud conductors as so-called cavities, and by mounting electronic components on the cavities, it is possible to connect to a mounting board on which a ceramic multilayer board is mounted. It is possible to obtain a high-density ceramic multilayer board with electronic components mounted on the opposing surface, and when the electronic components are sealed with resin together with the stud conductor, the stud conductor is sealed. It is possible to reinforce the resin by improving the strength of the resin, and it has a ceramic multilayer substrate that has a cavity formed by stud conductors and has high reliability. It is possible to obtain a.
- the height of the stud conductors should be in the range of 100 to 1000 / im S, preferably in the range of 200 to 800 / im. More preferably.
- the height of the stud conductor is lower than 100 ⁇ , the upper end of the mounted electronic component will protrude significantly from the upper end of the stud conductor, that is, the electronic component cannot be accommodated in the cavity structure. Therefore, the mounting structure of the ceramic multilayer board on the mother board may be restricted, and if the height of the stud conductor exceeds 1000 ⁇ , the strength of the stud conductor will decrease and sufficient reliability will be achieved. This is because there is a case where it is impossible to obtain sex.
- a circuit element is disposed inside, and a terminal electrode is provided on the first main surface of the ceramic laminate facing the mounting substrate at the time of mounting.
- a ceramic multilayer substrate, wherein the terminal electrode is (a) from the first main surface of the ceramic laminate; A stud conductor disposed on the first main surface in a projecting manner; and (b) a connection conductor connecting the circuit element and the stud conductor, disposed inside the ceramic laminate.
- the first main surface in a region formed on the first main surface by the conductor having the larger planar area on the first main surface of the via hole conductor and the stud conductor.
- a method for manufacturing a ceramic multilayer substrate An unfired ceramic laminate formed by laminating a plurality of unfired ceramic layers, in which circuit elements are disposed, and at least when a ceramic multilayer substrate as a product is mounted. An unfired ceramic laminate in which an unfired via-hole conductor is disposed on the unfired ceramic layer of the outermost layer constituting the first main surface facing the mounting substrate, and the unfired ceramic laminate described above.
- a ceramic multilayer substrate having the above-described structure is obtained by including a non-fired stud conductor disposed so as to be in contact with the first main surface of the fired ceramic laminate, and removing the shrinkage suppression layer after firing. And a step of firing the unfired ceramic composite laminate at a temperature equal to or higher than the sintering temperature of the unfired ceramic layer and the shrinkage suppression layer is not sintered.
- C The step of removing the shrinkage suppression layer from the fired ceramic composite laminate can efficiently produce the ceramic multilayer substrate of the present invention described above.
- the shrinkage suppression layer is disposed on the first main surface of the unfired ceramic laminate and the ceramic laminate is laminated by a non-shrinking method, the shrinkage in the firing step is reduced. It is possible to efficiently and reliably manufacture a ceramic multilayer substrate with high shape accuracy without shrinkage.
- shrinkage suppression layer On at least the first main surface of the unfired ceramic laminate. Reverse side It is preferable that a shrinkage suppression layer is disposed also on the main surface of the substrate and fired in a state where the unfired ceramic laminate is sandwiched between the shrinkage suppression layers, so that a further higher shrinkage suppression effect can be obtained.
- FIG. 1 (a) is a cross-sectional view showing a configuration of a ceramic multilayer substrate according to an embodiment of the present invention, and (b) is a diagram showing a configuration of a main part thereof.
- FIG. 2 is an exploded sectional view for explaining a method for producing a ceramic multilayer substrate according to an embodiment of the present invention.
- FIG. 3 is a diagram for explaining a method for manufacturing a ceramic multilayer substrate according to an embodiment of the present invention, and is a cross-sectional view of a laminate including a shrinkage suppression layer.
- FIG. 4 is a diagram for explaining a method for producing a ceramic multilayer substrate according to an embodiment of the present invention, and is a cross-sectional view showing a state where a shrinkage suppression layer is removed after firing.
- FIG. 5] (a) is a schematic view of a terminal constituting the terminal electrode of the ceramic multilayer substrate according to Example 1 of the present invention.
- FIG. 1 is a view showing a planar shape of a via-hole conductor (stud conductor), and FIG. 4B is a view showing an arrangement of terminal electrodes of a ceramic multilayer substrate according to an embodiment of the present invention.
- FIG. 6 (a) and (b) are diagrams showing modifications of the ceramic multilayer substrate according to Example 1 of the present invention.
- FIG. 7] (a) to (f) are diagrams showing comparative examples compared with the ceramic multilayer substrate of Example 1 of the present invention.
- FIG. 8] (a) to (c) are views showing a main part of a ceramic multilayer substrate according to another embodiment (Example 2) of the present invention.
- FIG. 9 is a diagram showing an arrangement of terminal electrodes of a ceramic multilayer substrate according to Example 2 of the present invention.
- FIG. 10 is a view showing a modification of the ceramic multilayer substrate according to Example 2 of the present invention.
- FIG. L l (a) to (e) are diagrams showing comparative examples compared with the ceramic multilayer substrate of Example 2 of the present invention.
- FIG. 12 is a view showing a configuration of a main part of a ceramic multilayer substrate that is further used in another embodiment (Example 3) of the present invention.
- FIG. 13 is a diagram showing a configuration of a main part of a ceramic multilayer substrate which is further applied to another embodiment (Example 3) of the present invention.
- FIG. 14 is a cross-sectional view showing a ceramic multi-layer substrate that works on yet another embodiment (Example 4) of the present invention.
- FIG. 17 is a cross-sectional view showing a configuration of a conventional ceramic multilayer substrate.
- FIG. 1 (a) is a cross-sectional view showing a ceramic multilayer substrate according to an embodiment of the present invention
- FIG. 1 (b) is a diagram showing its terminal electrodes.
- the ceramic multilayer substrate A includes a ceramic laminate 10 composed of a plurality of laminated ceramic layers 41, an in-plane conductor 42 disposed in the ceramic laminate 10, and circuit elements.
- a circuit element 44 including a via-hole conductor 43 and the like, and a terminal electrode serving as a connection conductor to the mounting board 21 formed on the first main surface 10a facing the mounting board (printed board) 21 when the ceramic laminate 10 is mounted.
- 11 is a ceramic multilayer substrate.
- surface mount components such as the capacitor 12 and the IC chip component 13 are mounted on the second main surface (upper surface) 10b facing the first main surface 10a.
- the external electrodes 12a and 13a are electrically and mechanically connected to the mounting land 15 disposed on the upper surface 10b of the ceramic laminate 10 via the solder 14. By fixing the connection Has been done.
- the terminal electrode 11 is connected to the land electrode 16 formed on the mounting substrate (printed circuit board) 21 via the solder 14. It is implemented by fixing the connection.
- the terminal electrode 11 is a stat arranged on the first main surface 10a so as to protrude from the first main surface 10a of the ceramic multilayer body 10. And a connecting conductor 4 for connecting the circuit element 44 and the stud conductor 5 to each other.
- connection conductor 4 is disposed so as to be exposed on the first main surface 10a of the ceramic laminate 10, and the first via-hole conductor 1 joined to the stud conductor 5 on the exposed surface; (1) A second via-hole conductor 2 located on the inner layer side of the via-hole conductor 1 and joined to the first via-hole conductor 1 and a third via-hole conductor 2 located on the inner layer side of the second via-hole conductor 2 and joined to the second via-hole conductor 2 A via hole conductor 3 is provided, and the planar area of the second via hole conductor 2 is configured to be smaller than the planar areas of the first via hole conductor 1 and the third via hole conductor 3.
- Example 1 the first via hole conductor 1 and the third via hole conductor 3 are configured to have the same planar area, and the stud conductor 5 also has a planar area equal to the planar area of the first via hole conductor ⁇ . It is configured to be the same.
- the planar area force of the third via-hole conductor 3 has a step 6 between the third via-hole conductor 3 and the second via-hole conductor 2 that is larger than the planar area of the second via-hole conductor 2. Since the connecting conductor 4 is prevented from falling off, the coupling strength (connection strength) between the terminal electrode 11 and the ceramic laminate 10 can be improved, and the planar area of the stud conductor 5 is Mounting with terminal electrode 11 having at least the same planar area as that of first via-hole conductor 1 because it is the same as the planar area of first via-hole conductor 1 having a larger planar area than that of the second via-hole conductor It is possible to obtain a ceramic multilayer substrate with high reliability of bonding to electrodes and lands on the substrate.
- the first main surface when viewed from the first main surface 10a side of the ceramic laminate 10 toward the inner layer side of the ceramic laminate 10.
- the step portion 6 that is the boundary with the third via-hole conductor 3 functions to prevent the connecting conductor 4 from falling off, so that the coupling strength between the terminal electrode 11 and the ceramic laminate 10 can be reliably improved. It becomes possible.
- a so-called wedge-shaped terminal (terminal having a wider shape on both sides than a certain portion) may be formed by the stud conductor and the via-hole conductor.
- a ceramic green sheet is prepared by forming a ceramic slurry containing ceramic powder and a binder into a sheet shape. Then, a conductive paste containing Ag powder as an in-plane conductor (internal electrode) as a conductive component is printed at a predetermined position of the ceramic green sheet, and via holes for via holes are formed at predetermined positions as necessary. The via hole for the via hole is formed and filled with a conductive paste whose conductive component is Ag powder serving as a via hole conductor.
- A10 is used as a filler, borosilicate glass It is possible to use a low-temperature fired multilayer substrate material using as a sintering aid.
- an unfired stud conductor is disposed at a predetermined position on the lower surface (first main surface 10a) of the unfired ceramic laminate so as to be in contact with the prescribed unfired via-hole conductor.
- the shrinkage suppression layer 31 for example, a ceramic green sheet (A10 sheet) mainly composed of Al 2 O can be used.
- the unfired stud conductor is disposed on the lower surface side of the unfired ceramic laminate, for example, as shown in FIGS. 2 and 3, the A10 sheet which is the shrinkage suppression layer 31 is punched. A hole 31a is formed, and conductive paste P (fired stud conductor 5) containing Ag powder as a conductive component is filled therein, and a shrinkage suppression layer 31 having no hole is formed on the lower surface thereof. Can be done by laminating the layers on the lower side of the unfired ceramic laminate
- the unfired ceramic composite laminate is fired at a temperature that is equal to or higher than the sintering temperature of the unfired ceramic layer and at which the shrinkage suppression layer 31 does not sinter (870 ° C in this embodiment). .
- the first via-hole conductor 1 and the third via-hole conductor 3 have a rectangular planar shape, a planar dimension of 0.3 mm X O. 5 mm, a thickness of 0.025 mm, and a second
- the via hole conductor 2 has a rectangular planar shape, a planar dimension of 0.2 mm X O. 4 mm, and a thickness of 0.025 mm.
- the stud conductor 5 is also rectangular in plane shape, and the plane dimensions are 0.3 mm X 0.5 mm, and the thickness is 0.005 mm, 0.010 mm, 0.015 mm, 0.025 mm, 0.050 mm, 0.100.
- Eight types of mm, 0.200 mm, and 0.500 mm (sample numbers in Table 1:! to 8, Example 1—:! to 1 8).
- the first via-hole conductor 1 (stud conductor 5) has a planar dimension of 6 as shown in FIG. 5 (b). mm x 3.5mm, thickness 0 ⁇ 500mm thickness of ceramic laminate 10 first main surface 10a (bottom surface) with 0.5mm gap G1 in the horizontal direction and 0.3mm gap in the vertical direction G2 Is placed.
- a ceramic multilayer substrate having terminal electrodes 11 as shown in FIGS. 6 (a) and 6 (b) is manufactured. did.
- the ceramic multilayer substrate shown in Fig. 6 (a) (Sample No. 9 in Table 1, Modification 1-1) has the first via-hole conductor 1 (the planar shape is rectangular, the planar dimensions are 0.2 mm X O. 4 mm, thickness 0 025mm) and a second via-hole conductor 2 having a plane area larger than that of the first via-hole conductor 1 (planar shape is rectangular, plane dimensions 0.3 mm X O.
- a terminal electrode 11 formed of a stud conductor 5 (having a rectangular planar shape, a planar dimension of 0.3 mm X O. 5 mm, a thickness of 0.025 mm) is provided.
- the ceramic multilayer substrate in Fig. 6 (b) (Sample No. 10, Table 1-2, Modification 1-2) has a rectangular planar shape, a planar dimension of 0 ⁇ 2mm X O. 4mm, and a thickness of 0 ⁇ 025mm.
- the stud conductor 5 is used, that is, the stud conductor 5 having a planar area smaller than that of the first via-hole conductor 1 is used.
- the ceramic multilayer substrate of Example 1 has the same structure as the terminal electrode 11.
- a printed electrode 22 of 0.3 mm X O. 5 mm is arranged on the ceramic laminate 10 in the same manner as in FIG. 5 (b).
- a ceramic multilayer substrate as electrode 11 was fabricated.
- the above Example 11:! ⁇ 18 using the same conductive paste as that used for the via-hole conductor (sample number 11), and improving the electrode strength For this purpose, a sample (sample No. 12) using a conductive paste with glass added was prepared.
- the resistivity of the conductive paste added with glass is 10% higher than that of the conductive paste used for the via-hole conductors in Examples 1_1 to 1_8.
- the first via-hole conductor 1 without any unevenness on the side surface (the planar shape is rectangular and the planar dimension is 0.3 mm X O. 5 mm, thickness 0.075 mm) and stud conductor 5 formed on the surface of the ceramic laminate 10 (planar shape)
- a ceramic multilayer substrate having a terminal electrode 1 1 having a rectangular shape, a planar dimension of 0.3 mm X 0.5 mm, and a thickness of 0.025 mm) was produced.
- the first via-hole conductor 1 having no irregularities on the side surface (the planar shape is rectangular and the planar dimension is 0.2 mm) X O. 4mm, thickness is 0.075mm) and stud conductor 5 formed on the surface of the ceramic laminate 10 (planar shape is rectangular, plane dimension is 0.3mm X O. 5mm, thickness is 0.025mm)
- a ceramic multilayer substrate having powerful terminal electrodes was fabricated.
- the first via-hole conductor 1 (planar shape is rectangular, planar dimension 0.3 mm X O. 5 mm, thickness 0.25 mm) and the second via-hole conductor 2 having a smaller planar area than the first via-hole conductor 1 (planar shape is rectangular, plane dimensions 0.2 mm X O. 4 mm, thickness 0.025 mm)
- a terminal conductor 11 formed with a force of a stud conductor 5 (a rectangular shape of the plane, a plane dimension of 0.3 mm X O. 5 mm, a thickness of 0.025 mm).
- Comparative Example 1-6 (Sample No. 17), as shown in Fig. 7 (f), the stud conductor was removed from the terminal electrode configuration of Example 1 shown in Fig. 1 (b). A ceramic multilayer substrate having terminal electrodes with the above-described configuration was fabricated.
- the mounting board (printed board) by solder reflow processing
- the mounting board is dropped from heights of 1.2m, 1.5m, and 1.8m, and the ceramic multilayer board is dropped. The effect on the substrate was investigated.
- Comparative Example 1 1 Comparative Example 1 1 (Sample Nos. 11 and 12), Comparative Example 1—2 to 1-6 (Sample Nos. 13 to 17) than the case where terminal electrode 11 was formed only with printed electrode 22
- Comparative Example 1—2 to 1-6 Comparative Example 1—2 to 1-6 (Sample Nos. 13 to 17) than the case where terminal electrode 11 was formed only with printed electrode 22
- the terminal electrode 11 is formed from a via hole conductor or from a via hole conductor and a stud conductor as shown in FIG. It was recognized that the drop strength tended to be higher in the case of combination.
- Example 1 1-8 (Sample No. 8) in which the thickness of the stud conductor is 0.500 mm, the stud conductor may be broken, which causes an adverse effect because the stud conductor 5 is too thick. It is thought that
- the position where the crack occurs in the ceramic laminate is the boundary between the stress-concentrated ceramic laminate and the terminal electrode, but the contact portion between the ceramic laminate and the terminal electrode is Stress can be obtained by making a third-order (three-dimensional) contact like a terminal electrode consisting of a via-hole conductor and a stud conductor as in the case of the above embodiment, which is not two-dimensional (planar) like a printed electrode. Concentration can be relaxed and drop strength can be increased. Further, by providing unevenness on the side surface of the connection conductor made of the via-hole conductor, the contact area with the ceramic laminate can be increased, and the drop strength can be improved.
- the effect of suppressing the drop-out of the via-hole conductor was enhanced by making the shape of the terminal electrode made of the connection conductor made of the via-hole conductor and the terminal conductor made of the stud conductor into a shape having a small plane area at the intermediate part.
- a stud conductor made of a metal such as Ag that is more ductile By disposing a stud conductor made of a metal such as Ag that is more ductile, it is possible to secure a certain gap between the ceramic laminate constituting the ceramic multilayer substrate and the mounting substrate. It was confirmed that it was possible to improve the drop strength by mitigating the transmission of the stagnation mode and torsion mode of the mounting board to the ceramic multi-layer board.
- a force that requires a certain height (thickness) to the tad conductor If the height (thickness) is 0 ⁇ 010 mm or more, or 0.025 mm to 0.300 mm, an effect to be applied is obtained. I'm sure p'c!
- the method for forming the stud conductor is not limited to the embodiment of the present invention, and it can be formed by a method such as printing or plating.
- FIGS. 8 (a), (b), and (c) are diagrams showing the main configuration of a ceramic multilayer substrate according to another example (Example 2) of the present invention.
- Example 2 a ceramic having a terminal electrode having the structure shown in Figs. 8 (a), (b), and (c) using the same material as that used in Example 1 above.
- a multilayer substrate (Example 2—:! To 2 — 3 (sample Nos. 20 to 22 in Table 2)) was prepared. The manufacturing method and manufacturing conditions of the ceramic multilayer substrate were the same as in Example 1 above.
- the terminal electrode 11 shown in FIG. 8 (a) includes a connection conductor 4 composed of a first via hole 1 having a truncated cone shape and a second via hole 2 having an inverted truncated cone shape, and a first main body of the ceramic laminate 10.
- the cylindrical stud conductor 5 is formed on the surface 10a (lower surface). Furthermore, the cylindrical stud conductor 5 and the land electrode 16 on the mounting substrate 21 are connected by solder 14 (Example 2-1 and sample number 20).
- the terminal electrode 11 shown in FIG. 8 (b) includes a connection conductor 4 including a first via hole 1 having an inverted frustoconical shape and a second via hole 2 having an inverted frustoconical shape. It is formed of a cylindrical stud conductor 5 disposed on the main surface 10a (lower surface). Further, the cylindrical stud conductor 5 and the land electrode 16 on the mounting substrate 21 are connected by solder 14 (Example 2-2, sample number 21).
- the second via-hole conductor 2 has a large diameter of 0.3 mm, a small diameter of 0.2 mm and a thickness of 0.025 mm, and the stud conductor has a diameter of 0.3 mm and a thickness of 0.025 mm.
- the terminal electrode 11 is arranged in a lateral direction on the first main surface 10a (lower surface) of the ceramic laminate 10 having a plane dimension of 3 mm X 3 mm and a thickness of 0.5 mm in the manner shown in FIG. 1.
- the terminal electrode 11 of this modified example 2-1 is formed of an inverted frustoconical first via-hole conductor 1 and a cylindrical stud conductor 5 having a diameter larger than the small diameter of the via-hole conductor 1. Also in this modified example 2-1, the dimensions of the first via-hole conductor 1 are 0.3 mm for the large diameter, 0.2 mm for the small diameter, and 0.025 mm for the thickness of the stud conductor. 3mm, thickness 0.025mm.
- the constituent materials and dimensions of the first and second via-hole conductors 2 and the stud conductor 5 are the same as in the case of the ceramic multilayer substrate of Example 2-2 :! to 2-3.
- Comparative Example 2-1 As shown in FIG. 11 (a), a ceramic multilayer substrate having a printed electrode 22 of 0.3 mm X O. was made.
- the same conductive paste as that used for the via-hole conductor in Example 1 (sample No. 24) and glass for improving the electrode strength were used.
- a sample using the added conductive paste (Sample No. 25) was prepared.
- the resistivity of the conductive paste with glass added is 10 compared to the conductive paste used for the via-hole conductor in Example 1 above. / o getting taller.
- This terminal electrode is the same as that of Comparative Example 1-1 (sample number 11 or 12) shown in FIG. 7 (a) described in Example 1 above.
- Example No. 26 As shown in FIG. 11 (b), the configuration of the connection conductor 4 composed of the first and second via hole conductors 1 and 2 is the same as that of Example 2-1
- a ceramic multilayer substrate having a terminal electrode 11 which is the same as the terminal electrode 11 in FIG.
- Comparative Example 2-3 As Comparative Example 2-3 (Sample No. 27), as shown in Fig. 11 (c), the same as the terminal electrode 11 of Fig. 8 (b) of Example 2-2, provided with a stud conductor 5.
- a ceramic multilayer substrate having a substrate electrode 11 was prepared.
- Example No. 28 As Comparative Example 2_4 (Sample No. 28), as shown in FIG. 11 (d), it is the same as the terminal electrode 11 of FIG. 8 (c) of Example 2_3, and the stud conductor 5 is provided. A ceramic multilayer substrate having terminal electrodes 11 was prepared.
- the mounting board After mounting these ceramic multilayer boards on the mounting board (print board) by solder reflow processing, the mounting board is dropped from heights of 1.2 m, 1.5 m, and 1.8 m. The influence on the ceramic multilayer substrate was investigated.
- Comparative Example 2_2 to 2_5 (Sample Nos. 26 to 29) were compared to the case where the terminal electrode was formed only with the printed electrodes as in Comparative Example 2-1 (Sample Nos. 24 and 25). However, the drop strength tended to be higher when the terminal electrode was formed from the via-hole conductor or from the via-hole conductor and the stud conductor.
- Comparative Example 2_5 (Sample No. 29) has concave and convex portions on the side surface of the via-hole conductor that is the connecting conductor 4, and the first via-hole conductor 1 faces the first main surface of the ceramic laminate 10. Therefore, it was confirmed that the drop strength was low because it had a shape that would increase the planar area.
- Example 2-- !! 2-3 of the present invention and Modification 2-1 (Sample No. 23) within the scope of the present invention from the first main surface 10a of the ceramic laminate 10 It is confirmed that the drop strength is increased because it has a connection conductor made of a via hole conductor having a portion whose plane area increases continuously or stepwise toward the inner layer side of the ceramic laminate 10. It was.
- the via-hole conductor is formed into a truncated cone shape and is combined in a predetermined direction so that the first main surface 10a of the ceramic laminate 10 is directed to the inner layer side of the ceramic laminate 10. Therefore, it is possible to reliably form a connection conductor made of a via-hole conductor having a portion where the planar area increases continuously or stepwise, and mounting reliability with a large drop strength is the same as in the case of Example 1. It was confirmed that an excellent ceramic multilayer circuit board can be obtained.
- FIG. 12 and FIG. 13 are diagrams showing the main configuration (mainly the configuration of the terminal electrode) of the ceramic multilayer substrate that works on another embodiment (embodiment 3) of the present invention.
- the terminal electrode shown in FIG. 12 (configuration of Example 3-1; sample number 30) was formed by printing a conductive paste between the first via-hole conductor 1 and the stud conductor 5.
- the configuration of the terminal electrode of Example 1 is the same.
- the terminal electrode (configuration of Example 3_2, sample number 31) shown in FIG. 13 was formed by printing a conductive paste between the first via hole conductor 1 and the stud conductor 5.
- the first via-hole conductor 1 has a larger planar area than the first via-hole conductor 1 and has a (0.4 mm X O. 6 mm) printed electrode (catch pad) 23 and the stud conductor 5 has a first via-hole conductor having a planar area. Except that the one smaller than 1 (planar area 0.2 mm X O. 3 mm) is used, it has the same configuration as that of the terminal electrode of Example 1 of the present invention shown in FIG. 1 (b). I'm going.
- the mounting board (printed circuit board) by solder reflow processing
- the mounting board is 1.2 m, 1.5 m, 1. Dropping from heights of 8m and 2.lm, the effect on the ceramic multilayer substrate was investigated. The results are shown in Table 3.
- Example 3-1 and Example 3-2 As shown in Table 3, in the configurations of Example 3-1 and Example 3-2, it can be seen that the drop strength is improved by the effect of the printed electrode (catch pad) 23.
- Example 3 by disposing the printed electrode (catch pad) 23 between the stud conductor and the via-hole conductor, the drop strength can be further improved, and the ceramic is more reliable. A multilayer substrate can be obtained.
- FIG. 14 is a cross-sectional view showing a ceramic multi-layer substrate according to still another embodiment (embodiment 4) of the present invention
- FIG. 15 is a plan view thereof.
- the same reference numerals as those in FIGS. 1 and 5 indicate the same or corresponding parts.
- the ceramic multilayer substrate of Example 4 includes a plurality of terminal electrodes 11 protruding from the first main surface 10a at the peripheral edge of the first main surface 10a of the ceramic laminate 10.
- a connection conductor 4 composed of a first via-hole conductor 1, a second via-hole conductor 2, and a third via-hole conductor 3 and a terminal electrode 11 composed of a stud conductor 5 are provided.
- a wire bonded semiconductor IC 30 is mounted in a region R surrounded by the plurality of stud conductors 5 is a cavity structure portion in which the electronic component (the semiconductor IC 30 in the fourth embodiment) is accommodated.
- the ceramic of the terminal electrode 11 (the connecting conductor 4 constituting the terminal electrode 11)
- the planar area of the second via-hole conductor 2 is configured to be smaller than the planar areas of the first via-hole conductor 1 and the third via-hole conductor 3 so that the bonding strength to the multilayer body 10 is increased.
- a semiconductor IC 30 is mounted on the region (cavity structure portion) R surrounded by the plurality of stud conductors 5 by means of bonding, and is sealed with a resin 20.
- the sealing resin 20 covers the entire first main surface 10a side of the ceramic laminate 10 except for the lower end portion of the stud conductor 5 exposed for connection to the outside.
- the semiconductor IC 30 and the stud conductor 5 are integrally covered with the resin 20 as a whole.
- the 20 integrally covers the plurality of stud conductors 5 and the semiconductor IC 30 mounted in the region R surrounded by the stud conductors 5 as a whole, so that the stud conductor 5, the cavity structure portion, the wire bonding portion of the semiconductor IC 30, etc. It is possible to significantly improve the strength of the entire structure portion on the first main surface 10a side of the ceramic laminate 10 including the above, and obtain a ceramic multilayer substrate A having high density and high reliability.
- one type of resin may be used as the sealing resin, and a plurality of stud conductors and components such as semiconductor ICs may be integrally sealed with this resin.
- the resin provided in the resin and the resin covering the electronic component may be different types of resins.
- a resin for reinforcing the stud conductor (a resin having a relatively high viscosity) is used as the former resin, and a resin having a relatively low viscosity is used as the latter resin. It is possible to select the most suitable resin.
- the former resin to be a cavity wall first and then providing the latter resin, the former resin becomes a dam for the latter resin, and undesired overhanging of the latter resin is caused. Can be prevented.
- FIG. 16 is a cross-sectional view showing a modification of the ceramic multilayer substrate according to Example 4 of the present invention.
- the parts denoted by the same reference numerals as those in FIGS. 1 and 5 indicate the same or corresponding parts.
- the second via-hole conductor 2 formed from a plurality of conductors 2a is configured to have a smaller planar area than the other via-hole conductors.
- the predetermined first via-hole conductor 1 and second via-hole conductor 2 are composed of a plurality of conductors la and 2a as in this modification, the first via-hole conductor 1 and the second via-hole conductor 2 , It is possible to greatly improve the bonding strength of the terminal electrode 11 consisting of the third via-hole conductor 3 and stud conductor 5 to the ceramic laminate 10 and to sufficiently improve the reliability of the cavity structure. Become.
- the height of the stud conductors 5 is in the range of 100 to 1000 / im. I prefer to do it.
- the height of the stud conductor 5 is preferably in the range of 200 to 800 111.
- the height of the stud conductor is lower than 100 / m, the upper end of the mounted electronic component will protrude significantly from the upper end of the stud conductor, that is, the electronic component cannot be accommodated in the cavity structure. Therefore, there may be a problem that the mounting structure of the ceramic multilayer substrate on the mother substrate is restricted.
- the strength of the stud conductor may decrease, which may cause problems.
- the present invention is not limited to the above-described embodiments.
- the type of ceramic powder constituting the ceramic green sheet, the manufacturing conditions of the ceramic multilayer substrate, and the specifics of the terminal electrodes It is possible to add various applications and modifications within the scope of the invention with respect to a typical configuration.
- the bonding strength (connection strength) between the terminal electrode and the ceramic laminate constituting the ceramic multilayer substrate is large, and the mounting substrate on which the ceramic multilayer substrate is mounted is stagnant. Even when this occurs, it is possible to obtain a ceramic multilayer substrate having high internal reliability because stress is applied to the ceramic multilayer substrate, causing damage or dropout of the ceramic multilayer substrate.
- the present invention can be widely applied to ceramic multilayer substrates that are widely used in various electronic devices and the field of manufacturing ceramic multilayer substrates.
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Abstract
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