WO2018211883A1

WO2018211883A1 - Method for manufacturing resin multilayer substrate, resin multilayer substrate, and mounting structure of resin multilayer substrate

Info

Publication number: WO2018211883A1
Application number: PCT/JP2018/015688
Authority: WO
Inventors: 伊藤　慎悟; 邦明用水
Original assignee: 株式会社村田製作所
Priority date: 2017-05-18
Filing date: 2018-04-16
Publication date: 2018-11-22

Abstract

A method for manufacturing a resin multilayer substrate (101) includes a conductor forming step, a laminate forming step, and a cutting step. In the conductor forming step, inner conductor patterns (31, 32, 33) and mounting electrodes (P1, P2) are formed on a plurality of insulating base material layers (11, 12, 13) made mainly of a resin material. In the laminate forming step, after the conductor forming step, the laminated plurality of insulating base material layers (11, 12, 13) are heated and pressurized, the mounting electrodes (P1, P2) are arranged on the surface of the laminate, and the inner conductor patterns (31, 32, 33) are arranged inside of the laminate. In the cutting step, after the laminate forming step, a portion, in which the mounting electrodes (P1, P2) and the inner conductor patterns (31, 32, 33) overlap each other when viewed from the lamination direction (Z axis direction) of the plurality of insulating base material layers (11, 12, 13), is cut with a laser to form reattachment films (AF1, AF2) of the resin material on end faces (SS1, SS2) of the cut laminate (10).

Description

Manufacturing method of resin multilayer substrate, resin multilayer substrate, and mounting structure of resin multilayer substrate

The present invention relates to a resin multilayer substrate, and more particularly to a method for manufacturing a resin multilayer substrate in which a conductor pattern is formed on a laminate, a resin multilayer substrate obtained by the manufacturing method, and a mounting structure for the resin multilayer substrate.

Conventionally, it has been generally performed by cutting a mother substrate with a dicer or the like and cutting a large number of electronic components from the mother substrate (Patent Document 1).

JP-A-5-335194

6A is a cross-sectional view showing a state in which the resin multilayer substrate is being cut into individual pieces from the laminated body 10M which is a mother substrate, and FIG. 6B is a diagram illustrating the cut resin multilayer substrate 100 as a mounting substrate 200. It is sectional drawing which shows the mounted state.

When the laminated body 10M which is a mother substrate is cut from the first main surface VS1 toward the second main surface VS2 by the dicer blade DB or the like together with the mounting electrodes P1A and P2A formed on the first main surface VS1, the mounting electrodes P1A and P2A may be deformed and wrap around the end surface (cut surface) of the resin multilayer substrate (cut-out laminated body 10A). When this resin multilayer substrate 100 is mounted on the mounting substrate 200 via the solder 4A, the solder spreads along the mounting electrode P1A deformed so as to wrap around, and reaches the conductor pattern 33A exposed on the end surface of the multilayer body 10A. Solder 4A may reach. Therefore, a short circuit may occur between the conductor pattern 33A exposed on the end face of the multilayer body 10A and the mounting electrode P1A.

The object of the present invention is to provide a short circuit between the mounting electrode formed on the surface of the multilayer body and the internal conductor pattern exposed on the surface of the multilayer body when mounted on a mounting substrate or the like via a conductive bonding material. It is providing the resin multilayer substrate which can be suppressed.

(1) The method for producing the resin multilayer substrate of the present invention comprises:
A conductor forming step of forming an internal conductor pattern and mounting electrodes on a plurality of insulating base layers mainly composed of a resin material;
After the conductor forming step, the plurality of laminated insulating base layers are heated and pressurized, the mounting electrodes are arranged on the surface of the multilayer body, and the internal conductor patterns are arranged inside the multilayer body. Body formation process,
After the laminated body forming step, as seen from the laminating direction of the plurality of insulating base material layers, a portion where the mounting electrode and the internal conductor pattern overlap is cut with a laser, and the resin material is applied to the cut end face of the laminated body A cutting process for forming a reattachment film of
It is characterized by providing.

According to this manufacturing method, it is difficult for the cut mounting electrode to be deformed so as to wrap around the end face of the laminate. Therefore, when the resin multilayer substrate is mounted on the mounting substrate via the conductive bonding material, the conductive bonding material is suppressed from spreading along the end surface, and a short circuit between the mounting electrode and the internal conductor pattern is prevented. A suppressed resin multilayer substrate can be obtained.

According to this manufacturing method, the insulating reattachment film is formed on the end face so as to cover at least one of the part reaching the end face of the mounting electrode or the part reaching the end face of the internal conductor pattern. Therefore, even when the conductive bonding material spreads along the end surface when mounted on the mounting substrate via the conductive bonding material, the resin multilayer that further suppresses the short circuit between the mounting electrode and the internal conductor pattern A substrate can be obtained.

(2) In the above (1), a plating formation step in which a metal film that is less oxidizable than the internal conductor pattern is formed on the surface of the mounting electrode between the multilayer body formation step and the cutting step. It is preferable to provide. With this manufacturing method, the plating film formed on the surface of the mounting electrode is difficult to oxidize when cut with a laser. Therefore, the mountability of the manufactured resin multilayer substrate is improved as compared with the case where the plating film is not provided.

(3) The resin multilayer substrate of the present invention is
A laminate having a mounting surface and an end surface formed by laminating a plurality of insulating base layers mainly composed of a resin material;
A mounting electrode that is formed on the mounting surface of the laminate and is exposed to extend to reach the end surface;
An internal conductor pattern that is formed inside the laminate and is exposed to extend to reach the end face;
A reattachment film of the resin material formed on the end surface so as to cover at least one of the portion reaching the end surface of the mounting electrode or the portion reaching the end surface of the internal conductor pattern;
It is characterized by providing.

Due to this configuration, even when the conductive bonding material wets and spreads along the end surface when mounted on the mounting substrate via the conductive bonding material, the occurrence of a short circuit between the mounting electrode and the internal conductor pattern is suppressed. A resin multilayer substrate can be realized.

(4) In the above (3), it is preferable that a portion reaching the end face of the inner conductor pattern is an oxide film of the inner conductor pattern. With this configuration, the insulating property of the internal conductor pattern at the end face of the multilayer body is enhanced as compared with the case where the oxide film is not formed. Therefore, it is possible to further suppress the occurrence of a short circuit between the mounting electrode and the internal conductor pattern when mounted on the mounting substrate via the conductive bonding material.

(5) In the above (3) or (4), it is preferable that a portion reaching the end face of the mounting electrode is an oxide film of the mounting electrode. With this configuration, the insulating property of the mounting electrode at the end face of the stacked body is enhanced as compared with the case where the oxide film is not formed. Therefore, it is possible to further suppress the occurrence of a short circuit between the mounting electrode and the internal conductor pattern when mounted on the mounting substrate via the conductive bonding material.

(6) In the above (5), at least one of the mounting electrode or the internal conductor pattern may be a pattern made of copper foil. When at least one of the mounting electrode or the internal conductor pattern is a pattern made of copper foil, it has high conductivity and is easily oxidized.

(7) In the above (5) or (6), it is preferable that a metal plating film that covers the surface of the mounting electrode and is less oxidizable than the mounting electrode is provided. The plating film formed on the surface of the mounting electrode is less susceptible to oxidation than the mounting electrode. Therefore, the mounting property of the resin multilayer substrate is improved as compared with the case where the plating film is not provided.

(8) In the above (7), the plating film may be a gold plating film.

(9) In any one of the above (3) to (8), the thickness of the mounting electrode or the thickness of the internal conductor pattern is formed on the end surface of the mounting electrode and the end surface of the internal conductor pattern. It is preferable that it is below the thickness in the lamination direction of the said insulating base material layer between the parts which reach. With this configuration, it is possible to realize a resin multilayer substrate in which the thickness of the resin material reattachment film is large.

(10) The mounting structure of the resin multilayer substrate of the present invention is as follows:
Any one of the resin multilayer substrates of (3) to (9) above;
A mounting substrate on which the resin multilayer substrate is mounted and having external electrodes;
With
The mounting electrode is connected to the external electrode through a conductive bonding material.

With this configuration, when a resin multilayer board is mounted on a mounting board via a conductive bonding material, a short circuit between the mounting electrode formed on the surface of the multilayer body and the internal conductor pattern exposed on the surface of the multilayer body Can be suppressed.

According to the present invention, when mounting on a mounting substrate or the like via a conductive bonding material, a short circuit between the mounting electrode formed on the surface of the multilayer body and the internal conductor pattern exposed on the surface of the multilayer body is prevented. A resin multilayer substrate that can be suppressed can be realized.

FIG. 1 is a sectional view of a resin multilayer substrate 101 according to the present invention. 2A is an enlarged cross-sectional view of the first end surface portion SP1 in FIG. 1, and FIG. 2B is an enlarged cross-sectional view of the second end surface portion SP2 in FIG. FIG. 3 is a cross-sectional view showing a main part of the electronic device 301 according to the present invention. FIG. 4 is a cross-sectional view sequentially illustrating the manufacturing steps of the resin multilayer substrate 101. FIG. 5 is a cross-sectional view sequentially illustrating the manufacturing steps of the resin multilayer substrate 101. 6A is a cross-sectional view showing a state in which the resin multilayer substrate is being cut into individual pieces from the laminated body 10M which is a mother substrate, and FIG. 6B is a diagram illustrating the cut resin multilayer substrate 100 as a mounting substrate 200. It is sectional drawing which shows the mounted state.

Hereinafter, a specific example will be given with reference to the drawings to show embodiments for carrying out the present invention. FIG. 1 is a sectional view of a resin multilayer substrate 101 according to the present invention. 2A is an enlarged cross-sectional view of the first end surface portion SP1 in FIG. 1, and FIG. 2B is an enlarged cross-sectional view of the second end surface portion SP2 in FIG.

The resin multilayer substrate 101 includes a laminate 10, mounting electrodes P1, P2,

internal conductor patterns

31, 32, 33, and redeposition films AF1, AF2.

The laminate 10 is formed by laminating a plurality of insulating base material layers 11, 12, and 13 whose main component is a resin material (thermoplastic resin), and a first main surface VS1 and a second main surface VS2 facing each other. , A rectangular parallelepiped insulator having end faces SS1 and SS2. In the present invention, the first main surface VS1 corresponds to a “mounting surface”. The plurality of insulating base layers 11, 12, and 13 are sheets mainly made of a liquid crystal polymer, for example.

The mounting electrode P1 is a conductor that is formed on the first main surface VS1 of the multilayer body 10 and extends and exposed so as to reach the end surface SS1. The mounting electrode P1 is a conductor formed on the first main surface VS1 of the multilayer body 10. As shown in FIG. 2A, the portion of the mounting electrode P1 that reaches the end surface SS1 is an oxide film P1X of the mounting electrode P1. The surface of the mounting electrode P1 is covered with a plating film PL1. The plating film PL1 is a metal plating film that is less likely to be oxidized than the mounting electrode P1. The mounting electrode P1 is a conductor pattern such as a Cu foil, for example, and the plating film PL1 is a Ni / Au plating film whose base is Ni and whose surface is Au, for example.

The mounting electrode P2 is a conductor that is formed on the first main surface VS1 of the multilayer body 10, and is extended and exposed so as to reach the end surface SS2. The mounting electrode P2 is a conductor formed on the first main surface VS1 of the multilayer body 10. As shown in FIG. 2B, the portion of the mounting electrode P2 that reaches the end surface SS2 is the oxide film P2X of the mounting electrode P2. The surface of the mounting electrode P2 is covered with a plating film PL2. The plating film PL2 is a metal plating film that is less likely to be oxidized than the mounting electrode P2. The mounting electrode P2 is a conductor pattern such as a Cu foil, for example, and the plating film PL2 is a Ni / Au plating film whose base is Ni and whose surface is Au, for example.

The

inner conductor patterns

31, 32, and 33 are conductors that are formed inside the multilayer body 10 and are exposed by extending so as to reach the end surface SS1 or the end surface SS2. The

internal conductor patterns

31, 32, 33 constitute a part of a circuit (coil, capacitor, wiring, etc.) formed in the multilayer body 10. As shown in FIG. 2A, the portions reaching the end surface SS1 of the

internal conductor patterns

31, 33 are the

oxide films

31X, 33X of the

internal conductor patterns

31, 33. As shown in FIG. 2B, the portion reaching the end surface SS2 of the internal conductor pattern 32 is an oxide film 32X of the internal conductor pattern 32. The

internal conductor patterns

31, 32, 33 are, for example, Cu foil conductor patterns.

The redeposition film AF1 is an insulating film formed on the end surface SS1 so as to cover a portion reaching the end surface SS1 of the mounting electrode P1 and a portion reaching the end surface SS1 of the

internal conductor patterns

31 and 33. The redeposition film AF2 is an insulating film formed on the end surface SS2 so as to cover a portion reaching the end surface SS2 of the mounting electrode P2 and a portion reaching the end surface of the internal conductor pattern 32. As will be described in detail later, the reattachment films AF1 and AF2 are obtained by evaporating or vaporizing the resin material of the insulating base layers 11, 12, and 13 when the laminate 10 is cut out by a high-power laser. 10 is a film attached to the end faces SS1 and SS2.

As shown in FIG. 2A, the thickness A1 of the mounting electrode P1 and the thickness A2 of the

internal conductor patterns

31, 33 reach the end surface SS1 of the mounting electrode P1 and the end surface SS1 of the

internal conductor patterns

31, 33. It is below thickness B1, B2 in the lamination direction (Z-axis direction) of the insulating base material layer between the parts (A1 ≦ B1, A1 ≦ B2, A2 ≦ B1, A2 ≦ B2).

Further, as shown in FIG. 2B, the thickness A1 of the mounting electrode P2 and the thickness A2 of the internal conductor pattern 32 are a part reaching the end surface SS2 of the mounting electrode P2, and a part reaching the end surface SS2 of the internal conductor pattern 32. It is below thickness B3 in the Z-axis direction of insulating base material layers 12 and 13 between (A1 ≦ B3, A2 ≦ B3).

Next, a mounting structure in which the resin multilayer substrate 101 is mounted on a mounting substrate or the like via a conductive bonding material will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing a main part of the electronic device 301 according to the present invention.

The electronic device 301 includes a resin multilayer substrate 101, a mounting substrate 201, and the like. The mounting board 201 is, for example, a printed wiring board. The resin multilayer substrate 101 is mounted on the main surface of the mounting substrate 201. In addition, although electronic components other than the resin multilayer substrate 101 are mounted on the main surface of the mounting substrate 201, illustration is omitted.

External electrodes

41, 42, etc. are formed on the main surface of the mounting substrate 201. Although other conductors are formed on the main surface or inside of the mounting substrate 201, the illustration is omitted.

The mounting electrodes P1 and P2 of the resin multilayer substrate 101 are connected to the

external electrodes

41 and 42 through the conductive bonding material 4, respectively. The conductive bonding material 4 is, for example, solder.

The resin multilayer substrate 101 of the present invention is manufactured, for example, by the following process. 4 and 5 are cross-sectional views sequentially showing the manufacturing process of the resin multilayer substrate 101.

First, as shown in (1) in FIG. 4, first, a plurality of insulating base material layers 11, 12, and 13 in a collective substrate state using a resin material as a main material are prepared. The insulating base layers 11, 12, and 13 are sheets mainly made of a liquid crystal polymer, for example.

Next, the

inner conductor patterns

31C and 32C are formed on the surface of the insulating base material layer 11, the inner conductor pattern 33C is formed on the surface of the insulating base material layer 12, and the mounting electrodes P1C and P2C are formed on the surface of the insulating base material layer 13. Form. Specifically, the

inner conductor patterns

31C and 32C are formed by laminating a metal foil (for example, Cu foil) on one main surface of the insulating base layer 11, and patterning the metal foil by photolithography. An inner conductor pattern 33C is formed by laminating a metal foil (for example, Cu foil) on one side main surface of the insulating base material layer 12, and patterning the metal foil by photolithography. In addition, the mounting electrodes P1C and P2C are formed by laminating a metal foil (for example, Cu foil) on one main surface of the insulating base layer 13 and patterning the metal foil by photolithography.

This step of forming internal conductor patterns and mounting electrodes on a plurality of insulating base layers mainly composed of a resin material is an example of the “conductor forming step” in the present invention.

In addition, although not shown in the drawing, interlayer connection conductors may be formed on the plurality of insulating base material layers 11, 12, and 13. The interlayer connection conductor is provided with a through-hole using a laser or the like, and then a conductive paste containing one or more of Cu, Sn, or the like, or an alloy thereof is disposed, followed by heating and pressurization (the “laminated body formation” of the present invention). Provided by curing in step ")".

Next, a plurality of insulating base material layers on which the

internal conductor patterns

31C, 32C, and 33C and the mounting electrodes P1C and P2C are formed are stacked, and heated and pressed (collectively) from the direction of the white arrow shown in (1) in FIG. The laminated body 10C in the aggregate substrate state shown in (2) in FIG. 4 is formed by pressing. Thus, the mounting electrodes P1C and P2C are disposed on the surface of the multilayer body 10C, and the

internal conductor patterns

31C, 32C, and 33C are disposed inside the multilayer body 10C.

After the "conductor formation process", a laminated body is formed by heating and pressing a plurality of laminated insulating base layers, mounting electrodes are placed on the surface of the laminated body, and an internal conductor pattern is placed inside the laminated body This process is an example of the “laminated body forming process” in the present invention.

Next, as shown in (3) in FIG. 4, a metal film that is less oxidizable than the mounting electrodes P1C and P2C is formed on the surface of the mounting electrodes P1C and P2C by plating. The metal film to be plated is, for example, a Ni / Au plating film in which the base is Ni and the surface is Au.

Then, the laminated body 10C in the aggregate substrate state is separated into individual pieces along the separation line DL shown in (3) in FIG. Specifically, as shown in (4) in FIG. 4 and (5) and (6) in FIG. 5, a high-power laser from the first main surface VS1 to the second main surface VS2 of the laminated body 10C. By irradiating LR, the laminated body 10C is cut together with the mounting electrodes P1C and P2C and the

internal conductor patterns

31C, 32C and 33C. That is, as viewed from the Z-axis direction, portions where the mounting electrodes P1C, P2C and the

internal conductor patterns

31C, 32C, 33C overlap are cut by the high-power laser LR. The laser LR is, for example, a 60 W UV laser.

When cutting the laminated body 10C with the laser LR, the portion of the mounting electrodes P1 and P2 that reaches the cut surface of the laminated body 10C (end surfaces SS1 and SS2 of the subsequent laminated body 10) is heated by the heat received from the laser LR. Oxide films P1X and P2X of the mounting electrodes P1 and P2 are formed. Further, of the

internal conductor patterns

31, 32, 33, portions reaching the cut surface of the multilayer body 10C (end faces SS1, SS2 of the subsequent multilayer body 10) are heated by the heat received from the laser LR. , 33

oxide films

31X, 32X, 33X are formed.

Further, when the laminated body 10C is cut by the laser LR, the resin material of the insulating base layers 11, 12, and 13 is evaporated as shown in (4) in FIG. 4 and (5) and (6) in FIG. Alternatively, the vaporized material reattaches to the cut surface of the laminated body 10C (see the reattachment film AF shown in (4) in FIG. 4 and (5) and (6) in FIG. 5). Thereby, in the resin multilayer substrate 101 shown in (7) in FIG. 5, the portions reaching the end faces SS1, SS2 of the mounting electrodes P1, P2 and the portions reaching the end faces SS1, SS2 of the

internal conductor patterns

31, 32, 33 are formed. Reattachment films AF1 and AF2 of a resin material are formed on the end surfaces SS1 and SS2 of the cut laminate 10 so as to cover them.

After the “laminated body forming process”, the part where the mounting electrode and the internal conductor pattern overlap is cut with a laser when viewed from the stacking direction of the plurality of insulating base layers, and the resin material is reattached to the end face of the cut stack. This step of forming a film is an example of the “cutting step” in the present invention.

In this way, by separating the laminated body 10C in the aggregate substrate state, the resin multilayer substrate 101 shown in (7) in FIG. 5 is obtained.

The following effects can be obtained by manufacturing the resin multilayer substrate 101 by the above manufacturing method.

(A) According to the above manufacturing method, the cut mounting electrodes P1 and P2 are not easily deformed so as to go around the end surfaces SS1 and SS2 of the multilayer body 10. Therefore, when the resin multilayer substrate 101 obtained by the above manufacturing method is mounted on the mounting substrate 201 via the conductive bonding material 4 as shown in FIG. Wetting and spreading along the end surfaces SS1, SS2 is suppressed. Therefore, occurrence of a short circuit between the mounting electrodes P1 and P2 and the internal conductor pattern is suppressed.

(B) According to the manufacturing method, the end surface SS1 is formed so as to cover the portions reaching the end surfaces SS1, SS2 of the mounting electrodes P1, P2 and the portions reaching the end surfaces SS1, SS2 of the

internal conductor patterns

31, 32, 33. , SS2 are formed with insulating redeposition films AF1 and AF2. With this configuration, even when the resin multilayer substrate 101 is mounted on the mounting substrate 201 via the conductive bonding material 4, even if the conductive bonding material 4 wets and spreads along the end surfaces SS1, SS2, the mounting electrodes P1, P2 And short circuit between the inner conductor pattern and the inner conductor pattern are further suppressed.

(C) Furthermore, according to the above manufacturing method, when cutting with the laser LR, the setting of the output of the laser LR and the like is changed between the conductor portion (mounting electrode and internal conductor pattern) and the insulating base material layer portion. The resin multilayer substrate 101 can be obtained without any problem. That is, according to the manufacturing method, the resin multilayer substrate 101 of the present invention can be easily obtained without fine adjustment of the laser LR.

(D) In the above manufacturing method, as shown in (3) in FIG. 4, before cutting with the laser LR, a metal film that is less likely to be oxidized than the mounting electrodes P1C and P2C is formed on the surface of the mounting electrodes P1C and P2C. Plating is formed. When cutting with the laser LR, the plating film formed on the surfaces of the mounting electrodes P1 and P2 is difficult to oxidize. Therefore, by manufacturing the resin multilayer substrate 101 by the above manufacturing method, the mountability of the resin multilayer substrate 101 is improved as compared with the case where the plating films PL1 and P2 are not provided.

(E) Further, in the resin multilayer substrate 101 of the present invention, as shown in FIGS. 2A and 2B, the thickness (A1) of the mounting electrodes P1 and P2 and the

inner conductor patterns

31, 32, and 33 The thickness (A2) in the Z-axis direction of the insulating base material layer between the part reaching the end faces SS1, SS2 of the mounting electrodes P1, P2 and the part reaching the end faces SS1, SS2 of the

internal conductor patterns

31, 32, 33 It is below thickness (B1, B2, B3). In this configuration, since the thickness of the insulating base layer is larger than the thicknesses of the mounting electrodes P1, P2 and the

internal conductor patterns

31, 32, 33, the reattachment films AF1, AF2 of the resin material are used as the end faces when cutting with the laser LR. Easy to form in SS1 and SS2.

(F) In the resin multilayer substrate 101 of the present invention, portions reaching the end faces SS1, SS2 of the

internal conductor patterns

31, 32, 33 are the

oxide films

31X, 32X, 33X of the

internal conductor patterns

31, 32, 33. With this configuration, compared to the case where the

oxide films

31X and 32X are not formed, the insulating properties of the

internal conductor patterns

31, 32, and 33 at the end surfaces SS1 and SS2 of the multilayer body 10 are enhanced. Therefore, the occurrence of a short circuit between the mounting electrodes P1 and P2 and the internal conductor pattern when the resin multilayer substrate 101 is mounted on the mounting substrate 201 via the conductive bonding material 4 can be further suppressed.

Further, in the resin multilayer substrate 101,

oxide films

31X and 32X having a surface roughness larger than that of the

internal conductor patterns

31, 32 and 33 are formed in portions reaching the end faces SS1 and SS2 of the multilayer body 10. Therefore, at the time of cutting with the laser LR, the resin material of the insulating base layers 11, 12, and 13 is evaporated or vaporized as compared with the case where the oxide film is not formed in the portion reaching the end faces SS 1 and SS 2 of the stacked body 10. Things easily adhere to the portions reaching the end faces SS1, SS2 of the

internal conductor patterns

31, 32, 33.

Furthermore, in the resin multilayer substrate 101, since the

internal conductor patterns

31, 32, and 33 are conductor patterns of Cu foil, the conductivity is high and it is easily oxidized. Therefore, it is easy to form the

oxide films

31X, 32X, and 33X in the portion reaching the end faces SS1 and SS2 of the stacked body 10.

(G) In the resin multilayer substrate 101 of the present invention, the portions reaching the end faces SS1, SS2 of the mounting electrodes P1, P2 are the oxide films P1X, P2X of the mounting electrodes P1, P2. With this configuration, the insulating properties of the mounting electrodes P1 and P2 on the end surfaces SS1 and SS2 of the stacked body 10 are enhanced as compared with the case where the oxide films P1X and P2X are not formed. Therefore, the occurrence of a short circuit between the mounting electrodes P1 and P2 and the internal conductor pattern when the resin multilayer substrate 101 is mounted on the mounting substrate 201 via the conductive bonding material 4 can be further suppressed.

Further, in the resin multilayer substrate 101, oxide films P1X and P2X whose surface roughness is larger than that of the mounting electrodes P1 and P2 are formed at portions reaching the end faces SS1 and SS2 of the laminate 10. Therefore, at the time of cutting with the laser LR, the resin material of the insulating base layers 11, 12, and 13 is evaporated or vaporized as compared with the case where the oxide film is not formed in the portion reaching the end faces SS 1 and SS 2 of the stacked body 10. Things easily adhere to the portions reaching the end faces SS1, SS2 of the mounting electrodes P1, P2.

Furthermore, in the resin multilayer substrate 101, since the mounting electrodes P1 and P2 are Cu foil conductor patterns, they have high conductivity and are easily oxidized. Therefore, it is easy to form the oxide films P1X and P2X in the portion reaching the end faces SS1 and SS2 of the stacked body 10.

In the above-described resin multilayer substrate 101, an example in which the laminated body 10 has a rectangular parallelepiped shape has been shown, but the present invention is not limited to this configuration. The shape of the laminated body 10 can be changed as appropriate within the scope of the effects of the present invention. For example, the laminated body 10 may be a cube, a polygonal column, a cylinder, an elliptical column, or the like. It may be a shape, a T shape, a Y shape, or the like.

Further, the above-described resin multilayer substrate 101 has a configuration including the laminate 10 formed by laminating the three insulating base layers 11, 12, and 13, but is not limited thereto. The number of insulating base material layers forming the laminate 10 can be changed as appropriate within the range where the effects of the present invention are exhibited. Moreover, the laminated body 10 is not limited to the structure formed by laminating | stacking the some insulating base material layers 11, 12, and 13 which use a thermoplastic resin as a main material. The laminated body 10 may have a configuration formed by laminating a plurality of insulating base layers mainly composed of a thermosetting resin such as an epoxy resin.

In the resin multilayer substrate 101 described above, the reattachment films AF1 and AF2 reach the end faces SS1 and SS2 of the mounting electrodes P1 and P2 and the end faces SS1 and SS2 of the

internal conductor patterns

31, 32, and 33. Although the example formed in end surface SS1, SS2 was shown so that both of parts may be covered, it is not limited to this structure. The reattachment films AF1 and AF2 are formed so that the end surfaces SS1 and SS2 cover the portions of the mounting electrodes P1 and P2 that reach the end surfaces SS1 and SS2 or at least one of the end surfaces SS1 and SS2 of the

internal conductor patterns

31, 32, and 33. If it is formed in SS2, the effects of the present invention are exhibited.

Furthermore, in the resin multilayer substrate 101 described above, the example in which the surface of the mounting electrode P1 is coated with the plating film PL1 and the surface of the mounting electrode P2 is coated with the plating film PL2 is shown, but the present invention is not limited to this configuration. Absent. The plating films PL1 and PL2 are not essential components.

Moreover, although the example provided with the three

internal conductor patterns

31, 32, and 33 is shown in the above-mentioned resin multilayer substrate 101, it is not limited to this configuration. The shape, quantity, and the like of the internal conductor pattern can be changed as appropriate within the range where the effects of the present invention are exhibited.

Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

AF, AF1, AF2 ... redeposition film DB ... dicer blade DL ... separation line LR ... lasers P1, P1A, P1C, P2, P2A, P2C ... mounting electrodes P1X, P2X ... mounting electrode oxide films PL1, PL2 ... plating film SS1 , SS2 ... end face VS1 of the laminated body ... first main surface (mounting surface) of the laminated body
VS2 ... Second main surface 4 of laminated body 4 ... Conductive bonding material 4A ...

Solders

10, 10A, 10C, 10M ...

Laminated bodies

11, 12, 13 ... Insulating base material layers 31, 31C, 32, 32C, 33, 33C ...

Internal conductor patterns

31X, 32X, 33X ... Oxide film 33A of internal conductor pattern ...

Conductor patterns

41, 42 ...

External electrodes

100, 101 ...

Resin multilayer substrate

200, 201 ... Mounting substrate 301 ... Electronic equipment

Claims

A conductor forming step of forming an internal conductor pattern and mounting electrodes on a plurality of insulating base layers mainly composed of a resin material;
After the conductor forming step, the plurality of laminated insulating base layers are heated and pressurized, the mounting electrodes are arranged on the surface of the multilayer body, and the internal conductor patterns are arranged inside the multilayer body. Body formation process,
After the laminated body forming step, as seen from the laminating direction of the plurality of insulating base material layers, a portion where the mounting electrode and the internal conductor pattern overlap is cut with a laser, and the resin material is applied to the cut end face of the laminated body A cutting process for forming a reattachment film of
A method for producing a resin multilayer substrate.
2. The resin according to claim 1, further comprising a plating forming step of forming a metal film that is less oxidizable than the internal conductor pattern on the surface of the mounting electrode between the laminate forming step and the cutting step. A method for producing a multilayer substrate.
A laminate having a mounting surface and an end surface formed by laminating a plurality of insulating base layers mainly composed of a resin material;
A mounting electrode that is formed on the mounting surface of the laminate and is exposed to extend to reach the end surface;
An internal conductor pattern that is formed inside the laminate and is exposed to extend to reach the end face;
A reattachment film of the resin material formed on the end surface so as to cover at least one of the portion reaching the end surface of the mounting electrode or the portion reaching the end surface of the internal conductor pattern;
A resin multilayer substrate.
The resin multilayer substrate according to claim 3, wherein a portion reaching the end face of the inner conductor pattern is an oxide film of the inner conductor pattern.
The resin multilayer substrate according to claim 3 or 4, wherein a portion reaching the end face of the mounting electrode is an oxide film of the mounting electrode.
The resin multilayer substrate according to claim 5, wherein at least one of the mounting electrode or the internal conductor pattern is a pattern made of copper foil.
The resin multilayer substrate according to claim 5 or 6, further comprising a metal plating film that is coated on a surface of the mounting electrode and is less likely to be oxidized than the mounting electrode.
The resin multilayer substrate according to claim 7, wherein the plating film is a gold plating film.
The thickness of the mounting electrode and the thickness of the internal conductor pattern are equal to or less than the thickness in the stacking direction of the insulating base layer between the portion reaching the end surface of the mounting electrode and the portion reaching the end surface of the internal conductor pattern. The resin multilayer substrate according to any one of claims 3 to 8, wherein
The resin multilayer substrate according to any one of claims 3 to 9,
A mounting substrate on which the resin multilayer substrate is mounted and having external electrodes;
With
The mounting structure of the resin multilayer substrate, wherein the mounting electrode is connected to the external electrode via a conductive bonding material.