WO2015129600A1 - 多層基板の製造方法、及び多層基板 - Google Patents
多層基板の製造方法、及び多層基板 Download PDFInfo
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- WO2015129600A1 WO2015129600A1 PCT/JP2015/054939 JP2015054939W WO2015129600A1 WO 2015129600 A1 WO2015129600 A1 WO 2015129600A1 JP 2015054939 W JP2015054939 W JP 2015054939W WO 2015129600 A1 WO2015129600 A1 WO 2015129600A1
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- base material
- thermoplastic resin
- material layer
- conductor patterns
- multilayer substrate
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- 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
- H05K3/4632—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating thermoplastic or uncured resin sheets comprising printed circuits without added adhesive materials between the sheets
-
- 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
- H05K1/0296—Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295
- H05K1/0298—Multilayer circuits
-
- 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
- H05K1/0296—Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295
-
- 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
- H05K1/0313—Organic insulating material
-
- 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
- H05K1/14—Structural association of two or more printed circuits
- H05K1/144—Stacked arrangements of planar printed circuit boards
-
- 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
- H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
-
- 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
- H05K2201/09372—Pads and lands
- H05K2201/09472—Recessed pad for surface mounting; Recessed electrode of component
Definitions
- the present invention relates to a method for producing a multilayer substrate in which a plurality of thermoplastic resin base materials having conductor patterns formed thereon are laminated, and a multilayer substrate.
- Patent Document 1 a flat upper surface and a flat lower surface of a laminate in which an insulator layer of a flexible material is laminated are connected to an external electrode and a mother substrate for mounting electronic components, respectively.
- a circuit board provided with external electrodes is disclosed.
- Patent Document 1 it is difficult to place the electronic component at an accurate position with respect to the external electrode on the upper surface of the circuit board. It is also difficult to place. For this reason, there is a possibility that the mounting position of the electronic component is shifted with respect to the circuit board, or the mounting position of the circuit board is shifted with respect to the mother board.
- an object of the present invention is to provide a method for manufacturing a multilayer substrate and a multilayer substrate capable of suppressing a shift in mounting position.
- the present invention relates to a method for producing a multilayer substrate in which a plurality of thermoplastic resin substrates including a thermoplastic resin substrate on which a conductor pattern is formed are laminated and formed by thermocompression bonding.
- a thermocompression bonding process in which an elastic member is pressed against a portion of the outermost surface on which the mounting electrodes are formed with respect to the plurality of thermoplastic resin substrates, and in the laminating process, the thermoplasticity Regarding the occupancy ratio in the laminating direction of the low-fluidity member having a lower fluidity than the thermoplastic resin base material at the temperature at the time of thermocompression bonding of the resin base material, the occupancy ratio of the region overlapping the mounting electrode in the laminating direction is , Heavy on the mounting electrode So as to
- the portion with a low occupation ratio of the low-fluidity member is recessed inward in the stacking direction, so that a recess is formed in the portion of the surface of the multilayer substrate where the mounting electrode is formed.
- the multilayer substrate can be arranged so that the mounting electrode of the circuit board fits into the recess. Accurate alignment with respect to the mounting electrode.
- the solder when the multilayer board is mounted on the circuit board by solder, the solder accumulates in the formed recess, and the amount of solder protruding from the multilayer board can be reduced. As a result, it is possible to suppress problems such as short circuit with other circuits due to the protruding solder. In addition, since the spread of the solder is suppressed, the effect of self-alignment is enhanced, and the displacement of the mounting position can be suppressed.
- the low-fluidity member preferably includes the conductor pattern.
- the multilayer substrate can be reduced in height.
- the plurality of thermoplastic resin base materials are laminated so that the number of the conductive patterns laminated in the region overlapping the mounting electrode when viewed in the laminating direction is smaller than the region surrounding the region.
- the occupation ratio of the conductor pattern in the area overlapping the mounting area can be reduced.
- the conductor pattern formed on the thermoplastic resin base material constitutes a coil having a winding direction as a winding axis, and in the laminating step, the mounting electrode is arranged in an inner region of the coil as viewed in the laminating direction. It is preferable to laminate the plurality of thermoplastic resin substrates.
- the coil pattern can function as a low-fluidity member, a separately provided low-fluidity member can be eliminated or reduced.
- mounting electrodes are formed on the main surfaces of the different thermoplastic resin substrates, and in the laminating step, the main surfaces of the different thermoplastic resin substrates are the outermost surfaces opposite to each other. It is preferable that the thermoplastic resin base material is laminated, and in the thermocompression bonding step, an elastic member is pressed against the outermost surfaces on both sides on which the mounting electrodes are formed to perform thermocompression bonding.
- a concave portion recessed inward in the stacking direction is formed with respect to the main surface of the multilayer substrate opposite to the main surface on the side mounted on the circuit board.
- Other electronic components can be mounted on the multilayer substrate in which the recesses are formed.
- the mounting electrode on the electronic component side can be disposed so as to fit into the recess, so that the electronic component can be accurately aligned with the multilayer substrate.
- solder when electronic components are mounted on a multilayer board by solder, the solder accumulates in the formed recess, and the amount of solder protruding from the multilayer board can be reduced. As a result, it is possible to suppress problems such as short circuit with other circuits due to the protruding solder. In addition, since the spread of the solder is suppressed, the effect of self-alignment is enhanced, and the displacement of the mounting position can be suppressed.
- the present invention when a multilayer board is mounted, alignment can be performed with high accuracy. In addition, it is possible to suppress problems such as short-circuiting with other circuits due to the solder used for mounting the multilayer substrate. Furthermore, by suppressing the spread of the solder, the effect of self-alignment is enhanced, and displacement of the mounting position can be suppressed.
- FIG. 1 is an exploded perspective view of a multilayer substrate according to Embodiment 1.
- FIG. Sectional view taken along line II-II shown in FIG. The figure which shows the state which carried out the thermocompression bonding of the laminated body Sectional view showing the state where the multilayer board is mounted on the circuit board Sectional view showing the state where the multilayer board is mounted on the circuit board
- the exploded perspective view of the multilayer substrate concerning Embodiment 2 Sectional view taken along line VII-VII shown in FIG.
- Sectional drawing which shows the state which mounted the multilayer substrate 3 in the circuit board 4 is an exploded perspective view of a multilayer substrate according to Embodiment 4.
- FIG. 1 is an exploded perspective view of a multilayer substrate 1 according to the first embodiment.
- 2 is a cross-sectional view taken along line II-II shown in FIG.
- the multilayer substrate 1 is formed by thermocompression-bonding a laminate 10 in which a plurality of thermoplastic resins are laminated.
- FIG. 1 is an exploded perspective view of the multilayer substrate 1 before thermocompression bonding, and FIG. It is sectional drawing of the multilayer substrate 1 after pressure bonding.
- the multilayer substrate 1 includes a laminate 10 in which a coil is formed.
- the first base material layer 11, the second base material layer 12, the third base material layer 13, the fourth base material layer 14, and the fifth base material layer 15 are sequentially laminated and thermocompression bonded. It is formed.
- Each of the base material layers 11 to 15 has a rectangular shape having a long side and a short side, and the laminate 10 has a substantially rectangular parallelepiped shape.
- the base material layers 11 to 15 are formed using an insulating thermoplastic resin such as an LCP resin (liquid crystal polymer resin) as a base material.
- thermoplastic resin examples include PEEK (polyether ether ketone), PEI (polyether imide), PPS (poniphenylene sulfide), PI (polyimide), and these may be used instead of the liquid crystal polymer resin. .
- Rectangular conductor patterns 11A and 11B are formed on one main surface (the upper surface in FIG. 1) of the first base material layer 11.
- the conductor patterns 11A and 11B are examples of the “mounting electrode” according to the present invention, and are also examples of the “low fluidity member”.
- the first base material layer 11 is the outermost layer of the laminate 10, and the multilayer substrate 1 is mounted on a circuit board or the like with the main surface of the first base material layer 11 on which the conductor patterns 11A and 11B are formed as a mounting surface.
- the conductor patterns 11A and 11B are used as mounting electrodes of the multilayer substrate 1.
- interlayer connection conductors 11C and 11D are formed on the first base material layer 11 at positions overlapping the conductor patterns 11A and 11B in plan view.
- the interlayer connection conductors 11C and 11D are examples of the “low fluidity member” according to the present invention.
- regions that surround the conductor patterns 11A and 11B and overlap this region in the stacking direction of the stacked body 10 are denoted by P1 and P2.
- Conductor patterns 12A and 12B are independently formed on one main surface (the upper surface in FIG. 1) of the second base material layer 12.
- the second base material layer 12 is laminated on the first base material layer 11 with the main surface on which the conductor patterns 12A and 12B are formed facing the first base material layer 11 side.
- the conductor patterns 12A and 12B are belt-shaped, have one ends in the regions P1 and P2, are drawn from the position, and are wound so as to surround the regions P1 and P2.
- One end of each of the conductor patterns 12A and 12B located in the regions P1 and P2 is electrically connected to the conductor patterns 11A and 11B via the interlayer connection conductors 11C and 11D formed on the first base material layer 11.
- the conductor patterns 12A and 12B are an example of the “low fluidity member” according to the present invention.
- the conductor patterns 12A and 12B are members having lower fluidity than the base material layers 11 to 15 at the temperature (for example, 250 ° C. to 350 ° C.) when the laminated body 10 is thermocompression bonded.
- Conductor patterns 13A and 13B are independently formed on one main surface (the upper surface in FIG. 1) of the third base material layer 13.
- the conductor patterns 13A and 13B are examples of the “low-fluidity member” according to the present invention.
- the third base material layer 13 is laminated on the second base material layer 12 with the main surface on which the conductor patterns 13A and 13B are formed facing the second base material layer 12 side.
- the conductor patterns 13A and 13B are belt-shaped and are wound so as to surround the regions P1 and P2.
- the conductor patterns 13A and 13B do not have a portion overlapping the regions P1 and P2.
- One end of each of the conductor patterns 13A and 13B is connected to one end of each of the conductor patterns 12A and 12B via an interlayer connection conductor (not shown) formed on the second base material layer 12.
- Conductor patterns 14A and 14B are independently formed on one main surface (the upper surface in FIG. 1) of the fourth base material layer 14.
- the conductor patterns 14A and 14B are examples of the “low-fluidity member” according to the present invention.
- the fourth base material layer 14 is laminated on the third base material layer 13 with the main surface on which the conductor patterns 14A and 14B are formed facing the third base material layer 13 side.
- the conductor patterns 14A and 14B are belt-shaped and are wound so as to surround the regions P1 and P2.
- the conductor patterns 14A and 14B have no portion overlapping the regions P1 and P2.
- One end of each of the conductor patterns 14A and 14B is connected to one end of each of the conductor patterns 13A and 13B via an interlayer connection conductor (not shown) formed on the third base material layer 13.
- a conductor pattern 15A is formed on one main surface (the upper surface in FIG. 1) of the fifth base material layer 15.
- the conductor pattern 15A is an example of the “low fluidity member” according to the present invention.
- the fifth base material layer 15 is laminated on the fourth base material layer 14 with the main surface on which the conductor pattern 15A is formed facing the fourth base material layer 14 side.
- the conductor pattern 15A has a strip shape and is wound so as to surround the regions P1 and P2.
- the conductor pattern 15A has no portion overlapping the regions P1 and P2.
- One end and the other end of the conductor pattern 15 ⁇ / b> A are connected to one end of the conductor patterns 14 ⁇ / b> A and 14 ⁇ / b> B via an interlayer connection conductor (not shown) formed on the fourth base material layer 14.
- interlayer connection conductor formed in each layer is an example of the “low fluidity member” according to the present invention.
- Each conductor pattern formed on the laminate 10 forms one coil with the conductor patterns 11A and 11B as input / output ends and the winding axis as the lamination direction.
- the conductor patterns 12A, 13A, and 14A are wound in the same direction to form one coil with the winding axis as the stacking direction
- the conductor patterns 12B, 13B, and 14B are wound in the same direction
- the winding axis is One coil is formed in the stacking direction.
- these two coils are connected by the conductor pattern 15A, and one coil is formed.
- each conductor pattern formed on the base material layers 12 to 15 is wound so as to surround the regions P1 and P2. More specifically, some of the conductor patterns 12A and 12B formed on the second base material layer 12 are located in the regions P1 and P2, and the other conductor patterns are located in regions surrounding the regions P1 and P2. . Therefore, the number of conductor patterns stacked in the regions P1 and P2 is smaller than the number of conductor patterns stacked in the regions surrounding the regions P1 and P2. In other words, the occupation rate of the conductor pattern in the regions P1 and P2 is lower than the occupation rate of the conductor pattern in the region surrounding the regions P1 and P2.
- the multilayer substrate 1 is formed by forming each conductor pattern on each base material layer 11 to 15, laminating each base material layer 11 to 15, and thermocompression bonding each base material layer 11 to 15 in the stacking direction.
- the FIG. 3 is a view showing a state in which the laminate 10 is thermocompression bonded.
- the metal rigid body 100 is pressed from the fifth base material layer 15 side, and the elastic body 101 is pressed from the first base material layer 11 side.
- the elastic body 101 is, for example, silicon resin or silicon rubber.
- the occupancy rate of the conductor pattern in the regions P1 and P2 overlapping the conductor patterns 11A and 11B of the first base material layer 11 in the stacking direction is lower than the occupancy rate of the conductor pattern in the region surrounding the regions P1 and P2. Therefore, the fluidity in the stacking direction of the regions P1 and P2 is high, and the fluidity in the stacking direction of the other regions is low.
- the elastic body 101 is pressed in the laminating direction from the first base material layer 11 side with respect to the laminate 10 having different fluidity, the elastic body 101 is deformed in the regions surrounding the regions P1 and P2 having low fluidity. In the regions P1 and P2 having high fluidity, the regions P1 and P2 are deformed in the stacking direction.
- the regions with low fluidity other than the regions P1 and P2 are not easily dented even when pressed by the elastic body 101.
- the areas P1 and P2 having high fluidity are pressed by the elastic body 101, the pressed portions are recessed inward along the stacking direction.
- the conductor patterns 11A and 11B formed in the regions P1 and P2 are pushed inward along the stacking direction, and the conductor patterns 11A and 11B are positioned on the inner side of the surface of the stacked body 10.
- the recessed part 10A, 10B recessed inside the surface of the laminated body 10 is formed around the conductor patterns 11A, 11B. That is, the conductor patterns 11A and 11B are located at the bottoms of the recesses 10A and 10B formed on the surface of the multilayer body 10.
- the elastic body 101 is made of silicon resin, silicon rubber, or the like, and has an elastic modulus that deforms according to the level of fluidity as described above when pressing the base material layers 11 to 15 during thermocompression bonding. A member is preferred.
- FIG. 4 and 5 are cross-sectional views showing a state in which the multilayer board 1 is mounted on the circuit board 200.
- the circuit board 200 is, for example, a mother board.
- the conductor patterns 11A and 11B which are mounting electrodes of the multilayer substrate 1 are positioned at the bottoms of the recesses 10A and 10B formed on the surface of the multilayer body 10, so that the multilayer substrate 1 is mounted on the mounting electrodes 200A and 200B of the circuit substrate 200.
- the mounting electrodes 200A and 200B can be disposed so as to fit into the recesses 10A and 10B when mounting, the multilayer substrate 1 can be accurately aligned with the mounting electrodes 200A and 200B.
- solders 201A and 201B for mounting the conductor patterns 11A and 11B on the mounting electrodes 200A and 200B are accumulated in the recesses 10A and 10B, so that the amount of the solder 201A and 201B protruding from the multilayer substrate 1 can be reduced. As a result, it is possible to suppress problems such as short circuit with other circuits due to the protruding solder. In addition, since the spread of the solders 201A and 201B is suppressed, the effect of self-alignment is enhanced, and the displacement of the mounting position of the multilayer substrate 1 can be suppressed.
- convex portions 210 and 211 are formed on a part of the circuit board 200 on which the mounting electrodes 200 ⁇ / b> A and 200 ⁇ / b> B are formed. Since it can arrange
- a copper foil is affixed to one main surface of a thermoplastic resin sheet, or a single-sided copper affixed sheet is prepared. And according to the conductor pattern to form, a resist film is patterned on copper foil. Etching is performed to form a conductor pattern, and the resist film is removed. From the other side of the resin sheet (the side where the copper foil is not attached), each part (the part where the copper foil is removed by the above etching) is irradiated with laser light to make a hole, and this hole (via hole) Fill with conductive paste. These steps correspond to the “mounting electrode forming step” according to the present invention.
- each of the conductor patterns is formed in each of the base patterns 11A and 11B formed on the first base material layer 11 serving as the mounting electrode in the regions P1 and P2 that overlap in the stacking direction so that the conductor pattern is reduced. Formed on material layers 12-15. Specifically, the conductor pattern is formed on each of the base material layers 12 to 15 so that the occupation ratio of the conductor pattern in the areas P1 and P2 is lower than the occupation ratio of the conductor pattern in the areas surrounding the areas P1 and P2. Thereby, in the stacking direction, the fluidity of the regions P1 and P2 is higher than the fluidity of the regions surrounding the regions P1 and P2.
- the conductor pattern formed on each of the base material layers 12 to 15 is a low fluidity member having lower fluidity than the base material layers 11 to 15 at the temperature at the time of thermocompression bonding.
- the base material layers 11 to 15 are sequentially stacked so that one main surface of the first base material layer 11 on which the conductor patterns 11A and 11B are formed becomes the outermost surface (lamination step). At this time, alignment is performed in consideration of the positional relationship between the interlayer connection conductor formed on the base material layer and the conductor pattern. In this way, the base material layers 11 to 15 are laminated to form the laminate 10. And the laminated body 10 is thermocompression-bonded by pressing the metal rigid body 100 from the 5th base material layer 15 side, and pressing the elastic body 101 from the 1st base material layer 11 side (thermocompression-bonding process).
- the regions P1 and P2 having high fluidity are pushed inward in the stacking direction, the recesses 10A and 10B are formed on the surface of the multilayer body 10, and the conductor patterns 11A and 11B are on the inner side of the surface of the multilayer body 10 Will come to be located. Further, in the present embodiment, since the via hole is filled with the conductive paste, it is easier to be deformed at the time of thermocompression bonding than the through hole formed by plating or the like, and the laminated body 10 is easily recessed.
- the resin sheet is thermoplastic as described above, it is not necessary to use an adhesive. Further, during this heating and pressurizing treatment, the interlayer connection conductor and the corresponding conductor are joined. Thus, the multilayer substrate 1 shown in FIG. 2 can be manufactured by a simple process.
- the multilayer substrate 1 has the recesses 10A and 10B, and the conductor patterns 11A and 11B, which are mounting electrodes, are formed on the bottoms of the recesses 10A and 10B. Alignment can be performed accurately with respect to 200A and 200B. Further, since the solders 201A and 201B are accumulated in the recesses 10A and 10B, the amount of protrusion of the solders 201A and 201B from the multilayer substrate 1 can be reduced. As a result, it is possible to suppress a problem that the solder 201A and 201B that protrudes causes a short circuit with another circuit. In addition, since the spread of the solders 201A and 201B is suppressed, the effect of self-alignment is enhanced, and the displacement of the mounting position can be suppressed.
- the recesses 10A and 10B are formed by reducing the occupation ratio of the conductor pattern in the regions P1 and P2 and crimping with the elastic body 101, the manufacturing is easy. And since it is not necessary to provide another exclusive member in the laminated body 10 in order to form the recessed part 10A, 10B, the low profile of the multilayer substrate 1 is realizable. Furthermore, since the multilayer substrate 1 is an inductor element having a built-in coil, it is possible to realize an inductor element capable of suppressing a shift in mounting position.
- the conductor patterns 12A and 12B are positioned in the areas P1 and P2, but the other conductor patterns 13A, 13B, 14A, 14B, and 15A are in the areas P1, P2. You may make it locate in. In this case, the conductor pattern occupancy in the regions P1 and P2 only needs to be lower than the conductor pattern occupancy in the other regions. Further, by positioning the conductor patterns 13A, 13B, 14A, 14B, and 15A in the regions P1 and P2, the size (the amount of pressing) of the recesses 10A and 10B can be adjusted when the recesses 10A and 10B are formed.
- the recesses 10A and 10B can be formed small. If the occupancy ratio of the conductor pattern in the regions P1 and P2 is lowered, the amount of pressing of the regions P1 and P2 by the elastic body 101 increases, and the recesses 10A and 10B can be formed larger.
- FIG. 6 is an exploded perspective view of the multilayer substrate 2 according to the second embodiment.
- 7 is a cross-sectional view taken along line VII-VII shown in FIG.
- the concave portions 10A and 10B are formed in the multilayer body 10 by using the conductor pattern forming the coil, whereas in the present embodiment, the dummy patterns 23A, 23B, 24A, and 24B are used.
- the recesses 20A and 20B are formed in the laminate 20.
- the dummy patterns 23A, 23B, 24A, and 24B are electrically independent patterns irrespective of circuit wiring, and are members having lower fluidity than the thermoplastic resin at the temperature when the thermoplastic resin is crimped. If it is.
- the dummy patterns 23A, 23B, 24A, and 24B may be conductors or non-conductors such as ceramics.
- the multilayer substrate 2 includes a laminate 20.
- the first base material layer 21, the second base material layer 22, the third base material layer 23, the fourth base material layer 24, and the fifth base material layer 25 are sequentially laminated and thermocompression bonded. It is formed.
- Each of the base material layers 11 to 15 has a rectangular shape having a long side and a short side, and the laminate 10 has a substantially rectangular parallelepiped shape.
- the base material layers 11 to 15 are formed using an insulating thermoplastic resin such as an LCP resin (liquid crystal polymer resin) as a base material.
- Rectangular conductor patterns 21A and 21B are formed on one main surface (the upper surface in FIG. 6) of the first base material layer 21.
- the conductor patterns 21A and 21B are an example of a “mounting electrode” according to the present invention and an example of a “low fluidity member”.
- the first base material layer 21 is the outermost layer of the laminate 20, and the multilayer substrate 2 is mounted on a circuit board or the like with the main surface of the first base material layer 21 on which the conductor patterns 21A and 21B are formed as a mounting surface.
- the conductor patterns 21A and 21B are used as mounting electrodes of the multilayer substrate 1.
- interlayer connection conductors 21C and 21D are formed on the first base material layer 21 at positions overlapping the conductor patterns 21A and 21B in plan view.
- the interlayer connection conductors 21 ⁇ / b> C and 21 ⁇ / b> D are examples of the “low fluidity member” according to the present invention.
- the regions surrounding the conductor patterns 21A and 21B and overlapping with the regions in the stacking direction of the stacked body 20 are denoted by P1 and P2.
- Conductor patterns 22A and 22B are independently formed on one main surface (the upper surface in FIG. 6) of the second base material layer 22.
- the second base material layer 22 is laminated on the first base material layer 21 with the main surface on which the conductor patterns 22A and 22B are formed facing the first base material layer 21 side.
- the conductor patterns 22A and 22B are belt-shaped, have one ends in the regions P1 and P2, and are drawn from the position to the outside of the regions P1 and P2.
- One end of each of the conductor patterns 22A and 22B located in the regions P1 and P2 is electrically connected to the conductor patterns 21A and 21B via the interlayer connection conductors 21C and 21D formed on the first base material layer 21.
- Dummy patterns 23A and 23B are independently formed on the third base material layer 23.
- the dummy patterns 23A and 23B are examples of the “low-fluidity member” according to the present invention.
- the third base material layer 23 is laminated on the second base material layer 22 with the main surface on which the dummy patterns 23A and 23B are formed facing the second base material layer 22 side.
- the dummy patterns 23A and 23B are belt-like and are wound so as to surround the regions P1 and P2.
- the dummy patterns 23A and 23B are independent of the conductor patterns formed on the other base material layers 21, 22, 24, and 25.
- Dummy patterns 24A and 24B are independently formed on the fourth base material layer 24.
- the dummy patterns 24A and 24B are examples of the “low fluidity member” according to the present invention.
- the fourth base material layer 24 is laminated on the third base material layer 23 with the main surface on which the dummy patterns 24A and 24B are formed facing the third base material layer 23 side.
- the dummy patterns 24A and 24B are belt-shaped and are wound so as to surround the regions P1 and P2.
- the dummy patterns 24A and 24B are independent of the conductor patterns formed on the other base material layers 21 to 23 and 25.
- conductor patterns 25A and 25B are formed outside the regions P1 and P2.
- the conductor patterns 25A and 25B are examples of the “low-fluidity member” according to the present invention.
- the fifth base material layer 25 is laminated on the fourth base material layer 24 with the main surface on which the conductor patterns 25A and 25B are formed facing the fourth base material layer 24 side.
- the conductor patterns 25A and 25B are electrically connected to the conductor patterns 22A and 22B of the second base material layer 22 through interlayer connection conductors (not shown) of the third base material layer 23 and the fourth base material layer 24.
- the fifth base material layer 25 is formed by laminating a plurality of thermoplastic resins having a conductor pattern formed on the surface, and a coil is formed inside.
- the conductor patterns 25A and 25B formed on one main surface of the fifth base material layer 25 are connected to the ends of the underlying coils. That is, the coil existing in the fifth base material layer 25 of the multilayer substrate 2 has the conductor patterns 21A and 21B as input / output ends, and is electrically connected to the conductor patterns 21A and 21B via the conductor patterns 22A, 22B, 25A, and 25B. is doing.
- a coil is formed in a region overlapping the regions P1 and P2 so that the occupation ratio of the conductor pattern is low.
- the occupation rate of the conductor pattern in the regions P1 and P2 is lower than the occupation rate of the conductor pattern in the region surrounding the regions P1 and P2.
- the respective base material layers 21 to 25 are laminated, a metal rigid body is pressed from the fifth base material layer 25 side, an elastic body is pressed from the first base material layer 21 side, and thermocompression bonding is performed on the surface.
- the multilayer substrate 2 in which the recesses 20A and 20B are formed is manufactured. By forming the recesses 20A and 20B and positioning the conductor patterns 21A and 21B, which are mounting electrodes, on the inner side of the surface, the multilayer substrate 2 can be accurately aligned with the mounting electrodes of the circuit board.
- the solder since the solder accumulates in the recesses 20A and 20B, the amount of solder protruding from the multilayer substrate 2 can be reduced. As a result, it is possible to suppress problems such as short circuit with other circuits due to the protruding solder. In addition, since the spread of the solder is suppressed, the effect of self-alignment is enhanced, and the displacement of the mounting position can be suppressed.
- the dummy patterns 23A, 23B, 24A, and 24B it is possible to increase the occupation ratio of the conductor pattern in the region surrounding the regions P1 and P2 as compared with the case where the dummy patterns 23A, 23B, 24A, and 24B are not formed. For this reason, when it presses with the elastic body from the 1st base material layer 21 side, it becomes easy to form recessed part 20A, 20B in area
- FIG. 8 is a cross-sectional view of the multilayer substrate 3 according to the third embodiment.
- FIG. 9 is an exploded view of the multilayer substrate 3 according to the third embodiment.
- the concave portion is formed only on one main surface of the multilayer body, whereas in the present embodiment, the concave portions are formed on both main surfaces of the multilayer body 30.
- two coils are independently formed in the multilayer body 30.
- a laminated body 30 in which the first base material layer 31, the second base material layer 32, the third base material layer 33, the fourth base material layer 34, and the fifth base material layer 35 are laminated is thermocompression bonded. Formed.
- Rectangular conductor patterns 31A and 31B are formed on one main surface of the first base material layer 31 (upper surface in FIG. 9).
- the conductor patterns 31 ⁇ / b> A and 31 ⁇ / b> B are examples of “mounting electrodes” according to the present invention and also examples of “low fluidity members”.
- the first base material layer 31 is the outermost layer of the stacked body 30.
- regions that surround the conductor patterns 31A and 31B and that overlap with the regions in the stacking direction of the stacked body 30 are denoted by P1 and P2.
- Conductor patterns 32A and 32B are independently formed on one main surface (the upper surface in FIG. 9) of the second base material layer 32.
- the second base material layer 32 is laminated on the first base material layer 31 with the main surface on which the conductor patterns 32A and 32B are formed facing the first base material layer 31 side.
- the conductor patterns 32A and 32B have a belt-like shape as in the first embodiment, have one ends in the regions P1 and P2, and are routed from the position to bring the regions P1 and P2 inward. It is wound to surround.
- One end of each of the conductor patterns 32A and 32B located in the regions P1 and P2 is electrically connected to the conductor patterns 31A and 31B via an interlayer connection conductor (not shown) formed on the first base material layer 31.
- the conductor patterns 32A and 32B are examples of the “low-fluidity member” according to the present invention.
- the conductor patterns 32A and 32B are members having lower fluidity than the base material layers 31 to 35 at the temperature when the laminated body 10 is thermocompression bonded.
- Conductor patterns 33A and 33B are independently formed on one main surface (the lower surface in FIG. 9) of the third base material layer 33.
- the conductor patterns 33A and 33B are examples of the “low-fluidity member” according to the present invention.
- the third base material layer 33 is formed on the second base material layer 32 with the main surface (the upper surface in FIG. 9) opposite to the main surface on which the conductor patterns 33A and 33B are formed facing the second base material layer 32.
- the conductor patterns 33A and 33B are belt-like and are wound so as to surround the regions P1 and P2.
- One end of each of the conductor patterns 33A and 33B is connected to one end of each of the conductor patterns 32A and 32B via an interlayer connection conductor (not shown) formed on the second base material layer 32 and the third base material layer 33.
- Conductor patterns 34A and 34B are independently formed on one main surface (lower surface in FIG. 9) of the fourth base material layer 34.
- the conductor patterns 34A and 34B are examples of the “low-fluidity member” according to the present invention.
- the fourth base material layer 34 is formed on the third base material layer 33 with the main surface (upper surface in FIG. 9) opposite to the main surface on which the conductor patterns 34A and 34B are formed facing the third base material layer 33.
- the conductor patterns 34A and 34B are belt-shaped and are wound so as to surround the regions P1 and P2.
- One end of each of the conductor patterns 34A and 34B is connected to one end of each of the conductor patterns 33A and 33B via an interlayer connection conductor (not shown) formed on the fourth base material layer 34.
- Conductor patterns 35 ⁇ / b> A and 35 ⁇ / b> B are formed on one main surface (the lower surface in FIG. 9) of the fifth base material layer 35.
- the conductor patterns 35A and 35B are formed at positions that substantially overlap the conductor patterns 31A and 31B in the stacking direction.
- the fifth base material layer 35 is the outermost layer of the stacked body 30.
- the fifth base material layer 35 is formed on the fourth base material layer 34 with the main surface (upper surface in FIG. 9) opposite to the main surface on which the conductor patterns 35A and 35B are formed facing the fourth base material layer 34.
- the conductor patterns 35A and 35B are connected to one ends of the conductor patterns 34A and 34B via interlayer connection conductors and the like formed on the fifth base material layer 35.
- the conductor patterns 31A, 32A, 33A, 34A, and 35A formed on the base material layers 31 to 35 of the laminate 30 form one coil with the conductor patterns 31A and 35A as input / output ends.
- the conductor patterns 31B, 32B, 33B, 34B, and 35B formed on the base material layers 31 to 35 form one coil with the conductor patterns 31B and 35B as input / output ends. That is, two independent coils having the winding direction as the winding axis are formed in the laminate 30.
- the occupation ratio of the conductor pattern in the areas P1 and P2 is lower than the occupation ratio of the conductor pattern in the area surrounding the areas P1 and P2. Then, by laminating the respective base material layers 31 to 35 and pressing the elastic bodies 101A and 101B from both the first base material layer 31 and the fifth base material layer 35 and thermocompression bonding, the concave portions 30A, The multilayer substrate 3 on which 30B, 30C, and 30D are formed is manufactured.
- FIG. 10 is a cross-sectional view showing a state in which the multilayer board 3 is mounted on the circuit board 200.
- another electronic component 300 is mounted on the main surface of the multilayer body 30 on the side where the conductor patterns 31A and 31B are formed.
- the electrodes 300A and 300B of the electronic component 300 are mounted on the conductor patterns 31A and 31B with the solders 201C and 201D.
- the multilayer substrate 3 is mounted on the circuit board 200 with the main surface of the layer body 30 on the side where the conductor patterns 35A and 35B are formed as a mounting surface.
- the conductor patterns 35A and 35B are mounted on the mounting electrodes 200A and 200B of the circuit board 200 by the solders 201A and 201B.
- the multilayer substrate 3 can be accurately compared to the mounting electrodes 200A and 200B of the circuit board 200 Can be aligned. Further, since the solders 201A and 201B accumulate in the recesses 30A and 30B, the amount of the solder 201A and 201B protruding from the multilayer substrate 3 can be reduced, and the solder 201A and 201B that protrudes causes a short circuit with other circuits. Can be suppressed.
- the recesses 30C and 30D are formed, and the conductive patterns 31A and 31B as mounting electrodes are positioned on the inner side of the surface of the multilayer body 30, whereby the electronic component 300 can be accurately aligned with the multilayer substrate 3. .
- the solders 201C and 201D accumulate in the recesses 30C and 30D, the amount of the solder 201C and 201D protruding from the multilayer substrate 3 can be reduced, and the protruding solder 201C and 201D causes a short circuit with other circuits. Defects can be suppressed.
- FIG. 11 is an exploded perspective view of the multilayer substrate 4 according to the fourth embodiment.
- 12 is a cross-sectional view of the multilayer substrate 4 taken along line XII-XII shown in FIG.
- conductor patterns 41A and 41B serving as mounting electrodes are formed on one main surface of the laminate 40 of the multilayer substrate 4, and conductor patterns 45A and 45B are formed on the other main surface. Yes. Furthermore, the conductor patterns 41A and 45A and the conductor patterns 41B and 45B are respectively formed at different positions in the stacking direction.
- the laminated body 40 is formed by laminating a first base material layer 41, a second base material layer 42, a third base material layer 43, a fourth base material layer 44, and a fifth base material layer 45, and thermocompression bonding. Is done.
- Rectangular conductor patterns 41A and 41B are formed on one main surface (the upper surface in FIG. 11) of the first base material layer 41. Moreover, rectangular conductor patterns 45A and 45B different from the conductor patterns 41A and 41B in the stacking direction are formed on one main surface (the lower surface in FIG. 11) of the fifth base material layer 45.
- the first base material layer 41 and the fifth base material layer 45 are the outermost layers of the stacked body 40.
- the conductor patterns 41A and 41B and the conductor patterns 45A and 45B are examples of “mounting electrodes” according to the present invention, and are also examples of “low fluidity members”.
- regions that surround the conductor patterns 41A and 41B and that overlap with the regions in the stacking direction of the stacked body 40 are denoted by P1 and P2.
- regions that surround the conductor patterns 45A and 45B and that overlap with the regions in the stacking direction of the stacked body 40 are denoted by P3 and P4.
- Conductor patterns 42A and 42B are independently formed on one main surface (the upper surface in FIG. 11) of the second base material layer 42.
- the conductor patterns 42A and 42B are examples of the “low-fluidity member” according to the present invention.
- the second base material layer 42 is laminated on the first base material layer 41 with the main surface on which the conductor patterns 42A and 42B are formed facing the first base material layer 41 side.
- the conductor pattern 42A has a belt-like shape, and has a portion wound so as to surround the region P1 and a portion wound so as to surround the region P3, and these two portions are conductive. is doing.
- the part wound so as to surround the region P1 is partly located in the region P1, and a part of the conductor pattern 41A is interposed via the interlayer connection conductor 41C formed in the first base material layer 41. And continuity.
- the conductor pattern 42B has a strip shape, and has a portion wound so as to surround the region P2 and a portion wound so as to surround the region P4, and these two portions are electrically connected. is doing.
- the part wound so as to surround the region P2 is partially located in the region P2, and a part of the conductor pattern 41B is interposed via the interlayer connection conductor 41D formed on the first base material layer 41. And continuity.
- Interlayer connection conductors 41C and 41D are examples of the “low fluidity member” according to the present invention.
- Conductor patterns 43A, 43B, 43C, and 43D are independently formed on one main surface (the upper surface in FIG. 11) of the third base material layer 43.
- the conductor patterns 43A, 43B, 43C, and 43D are examples of the “low fluidity member” according to the present invention.
- the third base material layer 43 is laminated on the second base material layer 42 with the main surface on which the respective conductor patterns 43A, 43B, 43C, 43D are formed facing the second base material layer 42 side.
- the conductor pattern 43A has a strip shape and is wound so as to surround the region P3.
- the conductor pattern 43A is electrically connected to the conductor pattern 42A via an interlayer connection conductor (not shown) formed on the second base material layer 42.
- the conductor pattern 43B has a strip shape and is wound so as to surround the region P1.
- the conductor pattern 43B is electrically connected to the conductor pattern 42A via an interlayer connection conductor (not shown) formed on the second base material layer 42.
- the conductor pattern 43C has a strip shape and is wound so as to surround the region P2.
- the conductor pattern 43C is electrically connected to the conductor pattern 42B via an interlayer connection conductor (not shown) formed on the second base material layer 42.
- the conductor pattern 43D has a band shape and is wound so as to surround the region P4.
- the conductor pattern 43D is electrically connected to the conductor pattern 42B via an interlayer connection conductor (not shown) formed on the second base material layer 42.
- Conductor patterns 44A, 44B, and 44C are independently formed on one main surface (the upper surface in FIG. 11) of the fourth base material layer 44.
- the conductor patterns 44A, 44B, and 44C are examples of the “low-fluidity member” according to the present invention.
- the fourth base material layer 44 is laminated on the third base material layer 43 with the main surface on which the conductor patterns 44A, 44B, and 44C are formed facing the third base material layer 43 side.
- the conductor pattern 44A has a belt shape and is wound so as to surround the region P3.
- the conductor pattern 44A is electrically connected to the conductor pattern 43A via an interlayer connection conductor (not shown) formed in the third base material layer 43.
- the conductive pattern 44B has a belt-like shape, and has a portion wound so as to surround the region P1 and a portion wound so as to surround the region P2, and these two portions are conductive. is doing.
- a portion wound so as to surround the region P ⁇ b> 1 is electrically connected to the conductor pattern 43 ⁇ / b> B through an interlayer connection conductor (not shown) formed in the first base material layer 43.
- a portion wound so as to surround the region P ⁇ b> 2 is electrically connected to the conductor pattern 43 ⁇ / b> C via an interlayer connection conductor (not shown) formed in the first base material layer 43.
- the conductor pattern 44C has a band shape and is wound so as to surround the region P4.
- the conductor pattern 44C is electrically connected to the conductor pattern 43D through an interlayer connection conductor (not shown) formed on the third base material layer 43.
- Dummy patterns 451, 452, 453, and 454 of thermosetting resin are formed on the other main surface (the upper surface in FIG. 11) of the fifth base material layer 45. Since the dummy patterns 451, 452, 453, and 454 are cured by heating, the fluidity is lower than that of the base material layers 41 to 45 at the time of thermocompression bonding.
- the dummy patterns 451, 452, 453, and 454 are examples of the “low fluidity member” according to the present invention.
- the fifth base material layer 45 is laminated on the fourth base material layer 44 with the main surface on which the dummy patterns 451, 452, 453, 454 are formed facing the fourth base material layer 44.
- the dummy patterns 451 and 452 are wound so as to surround the regions P3 and P4.
- the conductor patterns 45A and 45B formed on one main surface of the fifth base material layer 45 are formed on the interlayer connection conductors 44D and 44E formed on the fourth base material layer 44 and the fifth base material layer 45. It is connected to conductor patterns 44A and 44C via interlayer connection conductors 45C and 45D.
- the dummy patterns 453 and 454 are wound so as to surround the areas P1 and P2.
- Each conductor pattern formed in the laminate 40 forms three coils with the conductor patterns 41A, 41B, 45A, 45B as input / output ends. Specifically, with the conductor patterns 41A and 45A as input / output ends, the conductor patterns 43A and 44A, and the conductor pattern 42A, which are wound in the same direction so as to surround the region P3, are wound in the same direction. A first coil having the winding direction as the winding axis is formed.
- the conductor patterns 41A and 41B are used as input / output ends, and the conductor pattern 42A is a portion that is wound so as to surround the region P1, the conductor pattern 42B, and the conductor pattern 44B, and includes the region P1.
- a coil is formed by winding the conductor pattern 42C and the conductor pattern 42B in such a manner that a portion wound so as to surround the region P2 is wound in the same direction.
- These two coils have a winding direction as a winding axis, and the two coils are connected in the conductor pattern 44B to form a second coil.
- the conductor patterns 44C and 43D and the conductor pattern 42B which are wound so as to surround the region P4, are wound in the same direction, and laminated.
- a third coil whose direction is the winding axis is formed.
- the occupation ratio of the conductor pattern in the regions P1, P2, P3, and P4 is It is lower than the occupation rate of the conductor pattern in the region surrounding the regions P1, P2, P3 and P4.
- the dummy patterns 451, 452, 453, and 454 formed in the regions surrounding the regions P1, P2, P3, and P4 are thermosetting resins and flow more than the base material layers 31 to 35 at the temperature at the time of thermocompression bonding. It is a member with low properties. For this reason, the dummy patterns 451, 452, 453, and 454 act in the same manner as other conductor patterns during thermocompression bonding.
- the base material layers 41 to 45 are laminated, the elastic body is pressed from both the first base material layer 41 and the fifth base material layer 45, and thermocompression bonding is performed.
- the multilayer substrate 4 having the recesses 40A, 40B, 40C, and 40D formed thereon is manufactured.
- FIG. 13 is an exploded view when the laminated body 40 is thermocompression bonded.
- FIG. 14 is a view showing a state in which the laminate 40 is thermocompression bonded.
- the multilayer substrate 4 is formed by forming each conductor pattern on each base material layer 41 to 45, then laminating each base material layer 41 to 45, and thermocompression bonding each base material layer 41 to 45 in the stacking direction.
- The When thermocompression bonding is performed, in the regions P1 and P2 where the recesses 40C and 40D are formed, the elastic body 101C is pressed from the first base material layer 41 side, and the metal rigid body 100B is pressed from the fifth base material layer 45 side. In the regions P3 and P4 where the recesses 40A and 40B are formed, the elastic bodies 101D and 101E are pressed from the fifth base layer 45 side, and the metal rigid body 100A is pressed from the first base layer 41 side.
- the occupation ratio of the conductor pattern in the areas P1, P2, P3, P4 is lower than the occupation ratio of the conductor pattern in the area surrounding the areas P1, P2, P3, P4. Therefore, when the regions P1 and P2 are pressed by the elastic body 101C from the first base material layer 41 side, the pressed portions are recessed inward along the stacking direction. Therefore, the conductor patterns 41A and 41B formed in the regions P1 and P2 are pushed inward along the stacking direction, and the conductor patterns 41A and 41B are positioned on the inner side of the surface of the stacked body 40. Then, around the conductor patterns 41A and 41B, recesses 40C and 40D that are recessed inward from the surface of the multilayer body 40 are formed.
- the regions P3 and P4 are pressed by the elastic bodies 101D and 101E from the fifth base material layer 45 side, the pressed portions are recessed inward along the stacking direction. For this reason, the conductor patterns 45A and 45B formed in the regions P3 and P4 are pushed inward along the stacking direction, and the conductor patterns 45A and 45B are positioned on the inner side of the surface of the stacked body 40. Then, around the conductor patterns 45A and 45B, recesses 40A and 40B that are recessed inward from the surface of the multilayer body 40 are formed.
- FIG. 15 is a cross-sectional view showing a state in which the multilayer board 4 is mounted on the circuit board 200.
- other electronic components 300 are mounted on the main surface of the multilayer body 40 on the side where the conductor patterns 41A and 41B are formed.
- the mounting electrodes 300A and 300B of the electronic component 300 are mounted on the conductor patterns 41A and 41B by the solders 201C and 201D.
- the multilayer board 4 is mounted on the circuit board 200 with the main surface of the multilayer body 40 on the side where the conductor patterns 45A and 45B are formed as a mounting surface.
- the conductor patterns 45A and 45B are mounted on the mounting electrodes 200A and 200B of the circuit board 200 by the solders 201A and 201B.
- the multilayer substrate 4 can be accurately aligned with the mounting electrodes of the circuit board. . Further, even if a deviation occurs during alignment, the position is restored to a normal position during reflow, so that the positional deviation during mounting can be reduced. Furthermore, by making the solder 201A, 201B accumulate in the recesses 40A, 40B, the amount of the solder 201A, 201B protruding from the multilayer substrate 4 can be reduced, and the protruding solder 201A, 201B becomes a solder ball and peels off. The problem of short-circuiting with other circuits can be suppressed.
- the electronic component 300 can be accurately aligned with the multilayer substrate 4. . Further, even if a deviation occurs during alignment, the position is restored to a normal position during reflow, so that the positional deviation during mounting can be reduced. Further, by allowing the solders 201C and 201D to collect in the recesses 40C and 40D, the amount of the solder 201C and 201D protruding from the multilayer substrate 4 can be reduced, and the protruding solder 201C and 201D peels off as solder balls. The problem of short-circuiting with other circuits can be suppressed.
- the number of base material layers is described as being less than the actual number of layers (for example, 10 layers). For this reason, regarding the occupancy ratio of the low-fluidity member in the stacking direction, the difference between the occupancy ratio of the region that overlaps the mounting electrode and the occupancy ratio of the region that surrounds the region overlapping the mounting electrode appears small in the drawing in the stacking direction. .
- the actual number of stacked layers is larger than the illustrated number of stacked layers, and the number of stacked low fluidity members located in the region surrounding the region overlapping the mounting electrode is larger than the illustrated number of stacked layers. For this reason, actually, the difference between the occupancy rate of the region overlapping the mounting electrode and the occupancy rate of the region surrounding the region overlapping the mounting electrode is more conspicuous when viewed in the stacking direction.
- Interlayer connection conductors 23A, 23B, 24A, 24B ... Dummy patterns 30A, 30B, 30C, 30D ... Recesses 31A, 31B, 32A, 32B, 33A, 33B, 34A, 34B, 35A, 35B ... Body patterns 40A, 40B, 40C, 40D ... concave portions 41A, 41B, 42A, 42B, 42C, 43A, 43B, 43C, 43D, 44A, 44B, 44C, 45A, 45B ... conductor patterns 41C, 41D, 44D, 44E ... interlayer Connection conductors 45C, 45D ... interlayer connection conductors 100, 100A, 100B ...
- metal rigid bodies 101, 101A, 101B, 101C, 101D, 101E elastic bodies (elastic members) 200 ... Circuit boards 200A, 200B ... Mounting electrodes 201A, 201B, 201C, 201D ... Solders 23A, 23B, 24A, 24B ... Dummy patterns 210, 211 ... Convex portions 300 ... Electronic components 300A, 300B ... Mounting electrodes 451, 452, 453 , 454 ... Dummy pattern
Abstract
Description
図1は、実施形態1に係る多層基板1の分解斜視図である。図2は、図1に示すII-II線の断面図である。なお、多層基板1は、複数の熱可塑性樹脂が積層された積層体10が熱圧着されて形成されるが、図1は熱圧着前の多層基板1の分解斜視図であり、図2は熱圧着後の多層基板1の断面図である。
図6は、実施形態2に係る多層基板2の分解斜視図である。図7は、図6に示すVII-VII線の断面図である。
図8は、実施形態3に係る多層基板3の断面図である。図9は、実施形態3に係る多層基板3の分解図である。実施形態1,2では、積層体の一方主面にのみ凹部を形成しているのに対し、本実施形態では、積層体30の両方の主面に凹部を形成している。また、本実施形態に係る多層基板3では、積層体30に2つのコイルが独立して形成されている。
図11は、実施形態4に係る多層基板4の分解斜視図である。図12は、図11に示すXII-XII線における多層基板4の断面図である。本実施形態では、実施形態3と同様に、多層基板4の積層体40の一方主面に実装電極となる導体パターン41A,41Bが形成され、他方主面に導体パターン45A,45Bが形成されている。さらに、導体パターン41A,45A、及び、導体パターン41B,45Bはそれぞれ、積層方向に異なる位置に形成されている。
1,2,3,4…多層基板
10,20,30,40…積層体
10A,10B…凹部
11,21,31,41…第1基材層
11A,11B…導体パターン
11C,11D…層間接続導体
12,22,32,42…第2基材層
12A,12B,13A,13B,14A,14B,15A…導体パターン
13,23,33,43…第3基材層
14,24,34,44…第4基材層
15,25,35,45…第5基材層
20A,20B…凹部
21A,21B,22A,22B,25A,25B…導体パターン
21C,21D…層間接続導体
23A,23B,24A,24B…ダミーパターン
30A,30B,30C,30D…凹部
31A,31B,32A,32B,33A,33B,34A,34B,35A,35B…導体パターン
40A,40B,40C,40D…凹部
41A,41B,42A,42B,42C,43A,43B,43C,43D,44A,44B,44C,45A,45B…導体パターン
41C,41D,44D,44E…層間接続導体
45C,45D…層間接続導体
100,100A,100B…金属剛体
101,101A,101B,101C,101D,101E…弾性体(弾性部材)
200…回路基板
200A,200B…実装電極
201A,201B,201C,201D…半田
23A,23B,24A,24B…ダミーパターン
210,211…凸部
300…電子部品
300A,300B…実装電極
451,452,453,454…ダミーパターン
Claims (7)
- 導体パターンが形成された熱可塑性樹脂基材を含む複数の熱可塑性樹脂基材を積層し、熱圧着して形成する多層基板の製造方法において、
熱可塑性樹脂基材の主面に実装電極を形成する実装電極形成工程と、
前記実装電極が形成された熱可塑性樹脂基材の主面が最外面となるように前記複数の熱可塑性樹脂基材を積層する積層工程と、
積層した前記複数の熱可塑性樹脂基材に対して、前記最外面の前記実装電極が形成された部分に弾性部材を押し当てて熱圧着する熱圧着工程と、
を備え、
前記積層工程では、
前記熱可塑性樹脂基材の熱圧着時の温度において前記熱可塑性樹脂基材よりも流動性の低い低流動性部材の積層方向における占有率について、積層方向に視て、前記実装電極に重なる領域の占有率が、前記実装電極に重なる領域を囲む領域の占有率より低くなるよう、前記複数の熱可塑性樹脂基材を積層する、
多層基板の製造方法。 - 前記低流動性部材は前記導体パターンを含む、
請求項1に記載の多層基板の製造方法。 - 前記積層工程では、
積層方向に視て前記実装電極に重なる領域における前記導体パターンの積層数が、前記実装電極に重なる領域を囲む領域より少なくなるよう、前記複数の熱可塑性樹脂基材を積層する、
請求項2に記載の多層基板の製造方法。 - 前記熱可塑性樹脂基材に形成された導体パターンは、積層方向を巻回軸とするコイルを構成しており、
前記積層工程では、
積層方向に視て前記コイルの内側領域に前記実装電極が配置されるよう、前記複数の熱可塑性樹脂基材を積層する、
請求項3に記載の多層基板の製造方法。 - 前記実装電極形成工程では、異なる熱可塑性樹脂基材それぞれの主面に実装電極を形成し、
前記積層工程では、前記異なる熱可塑性樹脂基材の主面が互いに反対側の最外面となるように前記熱可塑性樹脂基材を積層し、
前記熱圧着工程は、
前記実装電極が形成された両側の前記最外面に弾性部材を押し当てて熱圧着する、
請求項1から4の何れかに記載の多層基板の製造方法。 - 導体パターンが形成された熱可塑性樹脂基材を含む複数の熱可塑性樹脂基材を積層し、熱圧着して形成する多層基板において、
複数の熱可塑性樹脂基材が積層された積層体と、
前記積層体の主面に形成された実装電極と、
を備え、
前記積層体は、
前記実装電極が形成された部分に積層方向において内側に凹んだ凹部を有しており、かつ、前記熱可塑性樹脂基材の熱圧着時の温度において前記熱可塑性樹脂基材よりも流動性の低い低流動性部材の積層方向における占有率について、積層方向に視て、前記実装電極に重なる領域が、前記実装電極に重なる領域を囲む領域の占有率より低くなるように前記低流動性部材が配置されている、
多層基板。 - 電極が形成された凸部を有する回路基板に対して、前記積層体の前記凹部が前記回路基板の前記凸部に嵌合するように配置され、前記実装電極が半田により前記回路基板の前記電極に接続される、請求項6に記載の多層基板。
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