JP2011249735A - Wiring board and method of manufacturing same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring board in which a probe for electrical inspection can be properly contacted to a semiconductor element connection pad, an electrode of a semiconductor element can be properly connected to the semiconductor element connection pad, and a wiring conductor tightly fits to a resin layer for protection, with both of them effectively prevented from peeling from each other.SOLUTION: In the wiring board, a wiring conductor 3 containing a plurality of semiconductor element connection pads 6 is embedded into the upper surface of an insulation substrate 1, and a resin layer 4 for exposing the semiconductor element connection pad 6 and an insulation substrate 1 arranged therearound is coated on the upper surface on the insulation substrate 1 and on the wiring conductor 3. The wiring conductor 3 is coated on the surface of the insulation substrate 1 side of the resin layer 4 by a semi-additive method. A part of the resin layer 4 and an insulating layer 2 arranged thereunder are removed down to a position lower than the upper surface of the semiconductor element connection pad 6, so that the semiconductor element connection pad 6 and the insulation substrate 1 arranged therearound are exposed.

Description

  The present invention relates to a method of manufacturing a wiring board used for mounting a semiconductor element or the like.

  Conventionally, as a method of manufacturing a wiring board for mounting a semiconductor element, a metal foil is releasably supported on a rigid flat support substrate, and insulating layers and conductor layers are alternately laminated on the metal foil. After forming a laminate for a wiring board including a metal foil, the laminate is separated from the support substrate by peeling between the support substrate and the metal foil, and then the metal foil is etched by a subtractive method. Forming a wiring conductor including a semiconductor element connection pad connected to the electrode of the semiconductor element, and finally a solder resist layer which is a protective resin layer having an opening exposing the semiconductor element connection pad on the surface of the laminate A method of manufacturing a multilayer and thin wiring board by depositing is known. Alternatively, a wiring conductor including a semiconductor element connection pad connected to the electrode of the semiconductor element is formed on the surface of the metal foil supported on the support substrate by a semi-additive method, and then an insulating layer and a conductor layer are formed thereon. After alternately laminating to form a laminate including a metal foil, the laminate is separated from the support substrate by peeling between the support substrate and the metal foil, and then the metal foil is entirely etched away, and finally A method of manufacturing a multilayer and thin wiring substrate by depositing a solder resist layer, which is a protective resin layer having an opening exposing a semiconductor element connection pad on the surface of the laminate, is known.

  However, according to the method described at the beginning, since the wiring conductor including the semiconductor element connection pads is formed by the subtractive method, for example, the wiring conductor including the fine semiconductor element connection pads having a width and interval of 30 μm or less is formed. Is difficult. Further, according to the method described later, since the wiring conductor including the semiconductor element connection pads is formed by the semi-additive method, the wiring conductor including the fine semiconductor element connection pads having a width and interval of, for example, 20 μm or less is formed. However, when the copper foil is removed by etching, the underlying wiring conductor is also etched, so that the wiring conductor including the semiconductor element connection pad is recessed from the surface of the surrounding insulating layer and the wiring conductor is not uniform. As a result, the semiconductor element connection pads vary in height. If the semiconductor element connection pad is recessed from the surface of the insulating layer, for example, it becomes difficult to bring a probe for electrical inspection into contact with the semiconductor element connection pad. In addition, if the height of the semiconductor element connection pad varies, it becomes difficult to connect the semiconductor element connection pad and the electrode of the semiconductor element. Furthermore, the adhesion between the wiring conductor and the solder resist layer is maintained by an anchor effect in which the resin of the solder resist layer meshes with fine irregularities on the surface of the wiring conductor. If the meshing between the two is not sufficient, for example, a semiconductor element is mounted. In some cases, when solder is used to bond the electrode of the semiconductor element and the semiconductor element connection pad using a flux, the flux may infiltrate between the solder resist layer and the wiring conductor, causing peeling between the two.

JP 2008-218450 A

  An object of the present invention is that, for example, a wiring including a fine semiconductor element connection pad having a width and interval of 20 μm or less is embedded in the surface of the insulating layer at a uniform height without being recessed from the surface of the insulating layer. It is possible to satisfactorily connect the probe for the semiconductor element to the semiconductor element connection pad, and it is possible to satisfactorily connect the electrode of the semiconductor element and the semiconductor element connection pad, and the wiring conductor and the protective resin layer It is an object to provide a wiring board that is firmly adhered to each other and effectively prevents peeling between the two.

  In the wiring board of the present invention, a wiring conductor including a plurality of semiconductor element connection pads connected to the electrodes of a semiconductor element is embedded in the upper surface of an insulating substrate made of a single layer or a multilayer insulating layer containing a resin. A wiring board in which the semiconductor element connection pad and a resin layer that exposes the insulating substrate between the semiconductor element connection pads are deposited on the upper surface of the insulating substrate and the wiring conductor, the wiring conductor being the resin A layer is deposited on the surface of the insulating substrate by a semi-additive method, and the resin layer and a part of the insulating layer therebelow are removed to a position lower than the upper surface of the semiconductor element connection pad. The semiconductor element connection pads and the insulating substrate between the semiconductor element connection pads are exposed.

  The method for manufacturing a wiring board according to the present invention includes a step of preparing a resin layer, and depositing a wiring conductor including a semiconductor element connection pad connected to an electrode of a semiconductor element on one main surface of the resin layer by a semi-additive method. A step of forming, a step of laminating a single-layer or multilayer insulating layer containing a resin on the one main surface and the wiring conductor, and a part of the resin layer from the other main surface side of the resin layer. And a step of exposing a part of the wiring conductor including the semiconductor element connection pad by removing by blasting or laser processing.

  According to the wiring board of the present invention, since the wiring conductor including the semiconductor element connection pad is formed by the semi-additive method, for example, a fine semiconductor element connection pad having a width and an interval of 20 μm or less can be formed. In addition, since the resin layer deposited on the upper surface of the wiring board and the wiring conductor is removed to a position lower than the upper surface of the semiconductor element connection pad, the semiconductor element connection pad and the insulating substrate therebetween are exposed. Since the connection pad protrudes to a high position from the surface of the surrounding insulating layer, the probe for electrical inspection can be satisfactorily brought into contact with the semiconductor element connection pad. Further, since the heights of the semiconductor element connection pads are uniform, the electrodes of the semiconductor elements and the semiconductor element connection pads can be connected well. Further, since the wiring conductor including the semiconductor element connection pad is deposited on the surface of the insulating layer side of the resin layer on the insulating substrate by the semi-additive method, the wiring conductor adheres firmly to the resin layer and is between the resin layer. There will be no peeling.

  According to the method for manufacturing a wiring board of the present invention, since the wiring conductor including the semiconductor element connection pads is formed by a semi-additive method, for example, fine semiconductor element connection pads having a width and interval of 20 μm or less are formed. be able to. In addition, since a part of the resin layer is removed by blasting or laser processing to expose a part of the wiring conductor including the semiconductor element connection pad, the semiconductor element connection pad is positioned higher than the surface of the surrounding insulating layer. Protruding state. Therefore, it is possible to provide a wiring board capable of satisfactorily bringing the probe for electrical inspection into contact with the semiconductor element connection pad. Further, since the heights of the semiconductor element connection pads are uniform, it is possible to provide a wiring board that can satisfactorily connect the electrodes of the semiconductor elements and the semiconductor element connection pads. Further, since the wiring conductor including the semiconductor element connection pad is deposited on the surface of the insulating layer side of the resin layer on the insulating substrate by the semi-additive method, the wiring conductor adheres firmly to the resin layer and is between the resin layer. There will be no peeling.

FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of a wiring board according to the present invention. FIG. 2 is a top view of an essential part of the wiring board shown in FIG. FIG. 3 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 4 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 5 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. 6 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 7 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 8 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 9 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 10 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 11 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 12 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 13 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 14 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 15 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 16 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 17 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 18 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring substrate shown in FIG. FIG. 19 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 20 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 21 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 22 is a schematic cross-sectional view for explaining the manufacturing method for manufacturing the wiring board shown in FIG. 23 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 24 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG. FIG. 25 is a schematic cross-sectional view for explaining a manufacturing method for manufacturing the wiring board shown in FIG.

  Next, an example of an embodiment of a wiring board according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an example of a wiring board according to the present invention, wherein 1 is an insulating substrate, 2 is an insulating layer, 3 is a wiring conductor, and 4 is a resin layer. The insulating substrate 1 is formed by laminating a plurality of insulating layers 2.

  The insulating substrate 1 is formed by laminating three insulating layers 2 in this example. Each insulating layer 2 is made of an electrically insulating material in which an inorganic insulating filler such as silicon oxide powder is dispersed in a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin. Alternatively, an electrically insulating material in which a glass cloth is impregnated with a thermosetting resin may be used. Each insulating layer 2 has a thickness of about 25 to 60 μm. A via hole 5 is formed in each insulating layer 2. The diameter of the via hole 5 is, for example, about 30 to 100 μm.

  The wiring conductor 3 is attached to the surfaces of the insulating layer 2 and the resin layer 4 by a semi-additive method. The wiring conductor 3 is formed of an electroless plating layer 3a and an electrolytic plating layer 3b, and the thickness thereof is about 5 to 20 μm. In the semi-additive method, an electroless plating layer 3a having a thickness of about 0.1 to 1 μm is deposited on the surface of the insulating layer 2 or the resin layer 4, and then the surface of the electroless plating layer 3a corresponds to the wiring conductor 3 Then, an electroplating layer 3b having a thickness of about 5 to 20 μm is deposited on the electroless plating layer 3a exposed in the opening pattern of the plating resist layer. In this method, the wiring conductor 3 is formed by removing the electroless plating layer 3a exposed from the electrolytic plating layer 3b after removing the plating resist layer. In the semi-additive method, since the wiring conductor 3 can be formed by etching and removing the electroless plating layer 3a having a thickness of about 0.1 to 1 μm, the pattern of the wiring conductor 3 itself is not greatly etched, for example, 20 μm. Wiring conductors 3 having the following line widths and intervals can be formed. As the electroless plating layer 3a and the electrolytic plating layer 3b, a copper plating layer is preferably employed.

  A resin layer 4 is deposited on the upper surface of the insulating substrate 1 and the wiring conductor 3 deposited on the upper surface. The thickness of the resin layer 4 is about 5 to 10 μm. The resin layer 4 includes a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin, and is made of an electrically insulating material that does not include a glass cloth or a photosensitive agent. In the resin layer 4, an opening 4 a that exposes a part of the wiring conductor 3 is formed. The wiring conductor 3 exposed from the opening 4a forms a semiconductor element connection pad 6 connected to the electrode of the semiconductor element. As shown in FIG. 2, many semiconductor element connection pads 6 are formed side by side with a width and interval of 20 μm or less. The opening 4a is opened to expose the plurality of semiconductor element connection pads 6 and the insulating substrate 1 therebetween. The opening 4a is formed by removing a part of the resin layer 4 by blasting or laser processing.

  Further, a solder resist layer 7 is deposited on the upper surface of the resin layer 4 and the lower surface of the insulating substrate 1. The solder resist layer 7 is made of an electrically insulating material in which an inorganic insulating filler such as silicon oxide powder is dispersed in a photosensitive thermosetting resin such as an acrylic-modified epoxy resin. The thickness of the solder resist layer 7 is about 10 to 30 μm. In the solder resist layer 7 on the resin layer 4, an opening 7a corresponding to the opening 4a is formed. In the solder resist layer 7 on the lower surface side, an opening 7b is formed to expose a part of the wiring conductor 3 deposited on the lower surface of the insulating substrate 1. The wiring conductor 3 exposed from the opening 7b forms an external connection pad 8 connected to the external electric circuit board. The external connection pads 8 have a diameter of about 250 to 500 μm, and many are formed side by side in a grid-like arrangement.

  In the wiring board of this example, the wiring conductor 3 formed on the upper surface of the insulating substrate 1 is formed by a semi-additive method on the surface of the resin layer 4 on the insulating substrate 1 side. Therefore, the wiring conductor 3 formed on the upper surface of the insulating substrate 1 is electrochemically and firmly attached to the resin layer 4. Further, since the resin layer 4 does not contain a photosensitive agent or the like, the adhesion with the wiring conductor 3 is strong. Therefore, for example, even when a semiconductor element is mounted by soldering the electrode of the semiconductor element and the semiconductor element connection pad 6 using a flux, the flux penetrates between the resin layer 4 and the wiring conductor 3 and the gap between the two. There will be no peeling.

  Furthermore, the wiring conductor 3 formed on the upper surface of the insulating substrate 1 is embedded in the surface of the uppermost insulating layer 2. Thus, the wiring conductor 3 formed on the upper surface of the insulating substrate 1 is filled with the insulating layer 2 between them, and the electrical insulation reliability between the adjacent semiconductor element connection pads 6 is high. .

  As described above, the opening 4a exposing the semiconductor element connection pad 6 is formed by removing a part of the resin layer 4 by blasting or laser processing. In blasting or laser processing, the insulating layer 2 made of an electrically insulating material containing resin is removed more than the wiring conductor 3 made of metal. As a result, the insulating layer 2 around the semiconductor element connection pad 6 is removed to a position lower than the upper surface of the semiconductor element connection pad 6. Therefore, since the semiconductor element connection pad 6 protrudes to a high position from the surface of the surrounding insulating layer 2, the probe for electrical inspection can be satisfactorily brought into contact with the semiconductor element connection pad 6. Further, in the blast processing or laser processing, the surface of the wiring conductor 3 can be evenly cut, so that there is no great variation in the height of the semiconductor element connection pads 6. Therefore, the electrode of the semiconductor element and the semiconductor element connection pad 6 can be connected well.

  Next, a method for manufacturing a wiring board according to the present invention will be described taking as an example the case of manufacturing the wiring board described above.

  First, as shown in FIG. 3, the support substrate 11, the prepreg 12, the copper foil 13 with a carrier, and the copper foil 14 with a resin layer are prepared. The support substrate 11, the prepreg 12, and the copper foil with resin 14 are the same size in plan view, and the copper foil with carrier 13 is smaller than that.

  The support substrate 11 is a plate-like body that is cured by impregnating a glass cloth with a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin. The thickness of the support substrate 11 is about 0.2 to 0.8 mm. Other materials can be used for the support substrate 11 as long as it has necessary rigidity and thermal expansion coefficient.

  The prepreg 12 is a plate-like body that is semi-cured by impregnating a glass cloth with a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin. The thickness of the prepreg 12 is about 70 to 200 μm.

  The copper foil 13 with a carrier is obtained by laminating a copper foil 13b with a thickness of about 2 to 18 μm so as to be peelable between both sides of a carrier sheet 13a made of a resin film or a copper foil with a thickness of about 20 to 100 μm. .

  The copper foil 14 with a resin layer is obtained by depositing a resin layer 4 called a primer resin on one surface of a copper foil 14a having a thickness of about 2 to 18 μm. The resin layer 4 is a semi-cured electrically insulating material that includes a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin and does not include a glass cloth or a photosensitive agent. The resin layer 4 is preferably selected from a material whose surface can be finely roughened with a roughening solution containing sodium permanganate or the like.

  Next, as shown in FIG. 4, the support substrate 11, the prepreg 12, the copper foil 13 with carrier, and the copper foil 14 with resin layer are stacked and heated while pressing from above and below to thermally cure the prepreg 12 and the resin layer 4. By stacking and integrating.

  Next, as shown in FIG. 5, the central portion of the copper foil 14a is removed by etching. Thereby, the center part of the resin layer 4 is exposed.

  Next, as shown in FIG. 6, an electroless plating layer 3 a is deposited on the exposed surface of the resin layer 4. The thickness of the electroless plating layer 3a is about 0.1 to 1 μm. As the electroless plating layer 3a, an electroless copper plating layer is preferably used. In addition, it is preferable to roughen the exposed surface of the resin layer 4 using, for example, a roughening solution containing potassium permanganate before depositing the electroless plating layer 3a. By roughening, the adhesion between the electroless plating layer 3a and the resin layer 4 can be made extremely strong by physical and electrochemical bonding.

  Next, as shown in FIG. 7, a plating resist layer 15 having an opening having a pattern corresponding to the uppermost wiring conductor 3 including the semiconductor element connection pads 6 is formed on the surface of the electroless plating layer 3a. The thickness of the plating resist layer 15 is about 10 to 30 μm.

  Next, as shown in FIG. 8, the electrolytic plating layer 3 b is deposited on the surface of the electroless plating layer 3 a exposed from the plating resist 15. The thickness of the electrolytic plating layer 3b is about 5 to 20 μm. As the electrolytic plating layer 3b, an electrolytic copper plating layer is preferably used.

  Next, as shown in FIG. 9, the plating resist layer 15 is peeled and removed. Thereby, the electroless plating layer 3a other than the part used as the wiring conductor 3 is exposed from the electrolytic plating layer 3b.

  Next, as shown in FIG. 10, the electroless plating layer 3a exposed from the electrolytic plating layer 3b is removed by etching. Thereby, the wiring conductor 3 composed of the electroless plating layer 3 a and the electrolytic plating layer 3 b is formed on the resin layer 4. This method is a so-called semi-additive method for forming a wiring conductor. In the case of this method, when the electroless plating layer 3a is removed by etching, the surface of the electroplating layer 3b is also etched at the same time, but the time required for removing the thin electroless plating layer 3a having a thickness of about 0.1 to 1 μm. Since the etching only needs to be performed, the pattern of the wiring conductor 3 is not greatly etched. Therefore, for example, the wiring conductor 3 having a line width and interval of 20 μm or less can be formed.

  Next, as shown in FIG. 11, the insulating layer 2 with the copper foil 16 is laminated so as to cover the resin layer 4 and the wiring conductor 3. As described above, the insulating layer 2 is made of an electrically insulating material in which an inorganic insulating filler such as silicon oxide powder is dispersed in a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin. Alternatively, an electrically insulating material in which a glass cloth is impregnated with a thermosetting resin may be used. The thickness of the insulating layer 2 is about 25 to 60 μm. The thickness of the copper foil 16 is about 2 to 18 μm. In order to laminate the insulating layer 2 with the copper foil 16, a semi-cured insulating sheet for the insulating layer 2 having the copper foil 16 attached to one side is covered with the resin layer 4 and the wiring conductor 3. A method is employed in which the insulating sheet is heated and cured while being pressed from above and below while being stacked.

  Next, as shown in FIG. 12, as in the case of the copper foil 14a, the central portion of the copper foil 16 is removed by etching. Thereby, the center part of the insulating layer 2 is exposed. At this time, unevenness corresponding to the unevenness of the surface on the insulating layer 2 side of the copper foil 16 remains on the exposed surface of the insulating layer 2. Therefore, if fine irregularities are provided on the surface of the copper foil 16 on the insulating layer 2 side, fine irregularities can be formed on the exposed surface of the insulating layer 2. When fine irregularities are formed on the exposed surface of the insulating layer 2, the electroless plating layer 3a can be very strongly deposited on the surface.

  Next, as shown in FIG. 13, a via hole 5 is formed in the insulating layer 2. The via hole 5 has a diameter of about 30 to 100 μm and is formed by laser processing. After the via hole 5 is formed, desmear treatment is preferably performed.

  Next, as shown in FIG. 14, an electroless plating layer 3 a is deposited on the exposed surface of the insulating layer 2. The thickness of the electroless plating layer 3a is about 0.1 to 1 μm. As the electroless plating layer 3a, an electroless copper plating layer is preferably used.

  Next, as shown in FIG. 15, a plating resist layer 17 having an opening having a pattern corresponding to the wiring conductor 3 of the next layer is formed on the surface of the electroless plating layer 3a. The thickness of the plating resist layer 17 is about 10 to 30 μm.

  Next, as shown in FIG. 16, the electroplating layer 3 b is deposited on the surface of the electroless plating layer 3 a exposed from the plating resist 17 so as to fill the via hole 5. The thickness of the electrolytic plating layer 3b is about 5 to 20 μm. As the electrolytic plating layer 3b, an electrolytic copper plating layer is preferably used.

  Next, after removing the plating resist layer 17 as shown in FIG. 17, the electroless plating layer 3a exposed from the electrolytic plating layer 3b is removed by etching as shown in FIG. Thereby, the next wiring conductor 3 composed of the electroless plating layer 3 a and the electrolytic plating layer 3 b is formed on the insulating layer 2.

  Thereafter, the insulating layer 2 and the wiring conductor 3 are alternately and repeatedly formed in the same manner, thereby forming the wiring board laminate 10 including the copper foil 13b on both surfaces of the support board 11, as shown in FIG.

  Next, as shown in FIG. 20, the region 10 a to be the wiring board of the stacked body 10 is cut out while being supported by the support 11.

  Next, as shown in FIG. 21, the region 10 a serving as the wiring board of the laminate 10 is peeled off between the carrier sheet 13 a and the copper foil 13 b and separated from the support 11.

  Next, as shown in FIG. 22, the copper foil 13b that has been in close contact with the resin layer 4 is removed by etching. Thereby, the resin layer 4 is exposed.

  Next, as shown in FIG. 23, a resist layer 18 is deposited on the surface of the resin layer 4. An opening 18 a is formed in the resist layer 18 in a region corresponding to the semiconductor element connection pad 6 in the wiring conductor 3 below the resin layer 4. At this time, it is preferable that the resist layer 18 is also deposited on the surface opposite to the resin layer 4.

  Next, as shown in FIG. 24, the resin layer 4 exposed from the opening 18a of the resist layer 18 is removed by blasting to expose the semiconductor element connection pads 6. At this time, the insulating layer 2 around the semiconductor element connection pad 6 exposed in the opening 18 a is removed to a position lower than the upper surface of the semiconductor element connection pad 6. Therefore, the semiconductor element connection pad 6 protrudes from the surface of the surrounding insulating layer 2 to a position higher by about 1 to 3 μm. In the blasting process, the surface of the wiring conductor 3 can be evenly cut, so that there is no great variation in the height of the semiconductor element connection pads 6. Therefore, in the wiring board manufactured according to the present invention, the probe for electrical inspection can be satisfactorily brought into contact with the semiconductor element connection pad 6. Furthermore, the electrode of the semiconductor element and the semiconductor element connection pad 6 can be connected well. Furthermore, since the wiring conductor 3 including the semiconductor element connection pads 6 is physically and electrochemically adhered to the resin layer 4 and the resin layer 4 does not contain a photosensitive agent, the wiring conductor 3 The close contact with is strong. Therefore, for example, even when a semiconductor element is mounted by soldering the electrode of the semiconductor element and the semiconductor element connection pad 6 using a flux, the flux penetrates between the resin layer 4 and the wiring conductor 3 and the gap between the two. Thus, it is possible to provide a wiring board in which peeling does not occur. The semiconductor element connection pad 6 may be exposed by using laser processing instead of blast processing. In this case, the same effect can be obtained.

  Next, as shown in FIG. 25, after removing the resist layer 18 from the surface of the resin layer 4, the solder resist layer 7 is formed, thereby completing the wiring substrate shown in FIG. In this example, the solder resist layer 7 is formed on the resin layer 4, but the solder resist layer 7 on the resin layer 4 may not be formed. In this case, the resin layer 4 functions alone as a protective resin layer.

  The present invention is not limited to an example of the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described example, the insulating layer with the copper foil 16 is possible. 2, the via hole 5 was formed and the electroless plating layer 3a was deposited, but the formation of the via hole 5 and the electroless plating layer 3a were left with the copper foil 16 left. After depositing and depositing the electroplating layer 3b on the pattern corresponding to the wiring conductor 3, the electroless plating layer 3a and the copper foil 16 exposed from the electroplating layer 3b are removed by etching. You may make it form the wiring conductor 3 which consists of the copper foil 16, the electroless-plating layer on it, and the electroplating layer on it.

DESCRIPTION OF SYMBOLS 1 Insulation board | substrate 2 Insulation layer 3 Wiring conductor 4 Resin layer 6 Semiconductor element connection pad 10 Laminated body 11 Support board

Claims (3)

  A wiring conductor including a plurality of semiconductor element connection pads connected to electrodes of a semiconductor element is embedded in an upper surface of an insulating substrate made of a single-layer or multilayer insulating layer containing a resin, and the upper surface of the insulating substrate and the A wiring board formed by depositing the semiconductor element connection pad and a resin layer exposing the insulating substrate between the semiconductor element connection pads on the wiring conductor, the wiring conductor on the insulating substrate side of the resin layer The resin layer and a part of the insulating layer thereunder are removed to a position lower than the upper surface of the semiconductor element connection pad, and the semiconductor element connection pad and the semiconductor layer A wiring substrate, wherein the insulating substrate between semiconductor element connection pads is exposed.   A step of preparing a resin layer, a step of depositing a wiring conductor including a semiconductor element connection pad connected to an electrode of a semiconductor element on one main surface of the resin layer by a semi-additive method, and the one main surface And a step of laminating a single-layer or multi-layer insulating layer containing a resin on the wiring conductor, and removing a part of the resin layer from the other main surface side of the resin layer by blasting or laser processing. And a step of exposing a part of the wiring conductor including the semiconductor element connection pad.   The said resin layer is prepared in the state by which the said other main surface side was supported on the support substrate, and is isolate | separated from the said support substrate before performing the said blasting or laser processing. A method for manufacturing a wiring board.

Images