JP5835732B2 - Wiring board - Google Patents

Description

  The present invention relates to a wiring board used for mounting electronic components such as semiconductor elements.

  Conventionally, as shown in FIG. 3, a wiring board used for mounting an electronic component such as a semiconductor element is a build-up layer made of a core insulating layer 11a made of, for example, a glass-epoxy plate, and an epoxy resin. A plurality of wiring conductor layers 12 made of a conductor layer such as a copper foil or a copper plating film are provided on the surface of each insulating layer 11a, 11b of an insulating substrate 11 formed by laminating a plurality of insulating layers 11b, and an insulating layer for a core The upper and lower wiring conductor layers 12 are connected by a through conductor (hereinafter referred to as a through-hole conductor) 13 penetrating 11a and a through conductor (hereinafter referred to as a via conductor) 14 penetrating each build-up insulating layer 11b.

  In such a wiring substrate, a part of the wiring conductor layer 12 provided on the surface of the outermost insulating layer 11b on the upper surface side of the insulating substrate 11 is connected to the electrode T of the electronic component E such as a semiconductor element via the solder bump B1. In addition, a part of the wiring conductor layer 12 provided on the surface of the outermost insulating layer 11b on the lower surface side of the insulating substrate 11 is formed on the external electric circuit board (non-electrical circuit board). The external connection pads 16 that are electrically connected via the solder balls B2 are formed in the figure), and these electronic component connection pads 15 and the external connection pads 16 are provided between the upper and lower surfaces of the insulating substrate 11. The wiring conductor layer 12, the through-hole conductor 13, and the via conductor 14 are electrically connected to each other. A solder resist layer 17 that exposes the electronic component connection pads 15 and the external connection pads 16 in a predetermined shape and size is laminated on the surface of the outermost insulating layer 11b.

  In this wiring board, the electrode T of the electronic component E is electrically connected to the electronic component connection pad 15 via the solder bump B1, and then the external connection pad 16 is connected to the external electric circuit board (not-used) via the solder ball B2. By connecting to the wiring conductor (shown), the electronic component E to be mounted is electrically connected to the external electric circuit.

  By the way, the wiring conductor layer 12 in such a wiring board is functionalized into a signal wiring conductor 12 (S), a ground wiring conductor 12 (G), and a power wiring conductor 12 (P) depending on applications. ing. Among these, the signal wiring conductor 12 (S) functions as a conductive path for propagating an electric signal between the electronic component E such as a semiconductor element and the external electric circuit board, and has a thin strip-shaped conductor pattern. ing. Further, the ground wiring conductor 12 (G) and the power wiring conductor 12 (P) have functions as supply paths for supplying a ground potential and a power supply potential to the electronic components E mounted on the wiring board, respectively. In addition, it has an electromagnetic shielding function and a characteristic impedance adjustment function for the signal wiring conductor 12 (S).

  The electronic component connection pad 15 and the external connection pad 16 connected to these signal, grounding and power supply wiring conductors 12 (S), 12 (G), 12 (P) correspond to the corresponding signals. , Grounding and power supply electronic component connection pads 15 (S), 15 (G), 15 (P) and signal, grounding and power supply external connection pads 16 (S), 16 (G), 16 ( P). These electronic component connection pads 15 (S), 15 (G), 15 (P) and external connection pads 16 (S), 16 (G), 16 (P) are provided on the surface of the outermost insulating layer 11b. Each of the wiring conductor layers 12 is formed by being exposed from the solder resist layer 17. The ground wiring conductor 12 (G) and the power wiring conductor 12 (P) are arranged, for example, with a wide area pattern that occupies a predetermined area in the wiring conductor layer 12 on the lower surface side of the insulating substrate 11. In many cases, a plurality of ground external connection pads 16 (G) and power supply external connection pads 16 (P) corresponding to the ground are formed immediately below and in the vicinity of the large area pattern. Often done.

  FIG. 4 shows a grounding wiring conductor 12 (G) and a grounding external connection pad 16 (G) connected thereto and a power supply wiring conductor 12 (P) and a power supply wiring conductor 12 (P) in the conventional wiring board. It is a principal part disassembled perspective view which shows the example of the external connection pad 16 (P) for power supplies. 4 shows a part of the wiring conductor layer 12 on the lower surface side of the insulating substrate 11 shown in FIG. 3 and through-hole conductors 13 and via conductors 14 connected thereto, and the broken-line arrows indicate the lower layer. The connection position of the via conductor 14 from the wiring conductor layer 12 is shown.

  As shown in FIG. 4, the uppermost wiring conductor layer 12 on the lower surface side of the insulating substrate 11 includes a large area grounding conductor 12 (G) and a large area power supply conductor 12 ( P) adjacent to each other. A plurality of corresponding through-hole conductors 13 are connected to the grounding wiring conductor 12 (G) and the power supply wiring conductor 12 (P), respectively.

  In the wiring conductor layer 12 located in the lower layer, a large area of the wiring conductor 12 (G) for grounding occupies most. In this region of this layer, the power supply wiring conductor 12 (P) has only a small circular land pattern for connecting the via conductor 14. The land pattern of the power wiring conductor 12 (P) and the ground wiring conductor 12 (G) are obtained by changing the land pattern of the power wiring conductor 12 (P) to the ground wiring conductor 12 (G). They are electrically insulated from each other by openings formed to surround them. The ground wiring conductor 12 (G) and the power wiring conductor 12 (P) correspond to the corresponding upper wiring conductor 12 (G) or power wiring conductor via the via conductors 14. 12 (P).

  In the lowermost wiring conductor layer 12, the wiring conductor 12 (P) for power supply having a large area occupies most of the wiring conductor layer 12. The power supply wiring conductor 12 (P) includes a plurality of power supply external connection pads 16 (P) in an arrangement in which the portions are gathered together. In this region of this layer, only the grounding external connection pad 16 (G) exists as the grounding wiring conductor 12 (G). The grounding external connection pad 16 (G) and the power supply wiring conductor 12 (P) are formed to surround the grounding external connection pad 16 (G) in the power supply wiring conductor 12 (P). The openings are electrically insulated from one another. The grounding external connection pads 16 (G) and the power supply wiring conductors 12 (P) are respectively connected to the corresponding upper-layer grounding wiring conductors 12 (G) or power supply wirings via the via conductors 14. It is connected to the conductor 12 (P). Note that some of the external connection pads 16 (P) for power supply are not provided with the power supply wiring conductor 12 (P) having a large area above the power supply wiring pad 12 (P). ) Is connected to the wiring conductor 12 (P) for the upper layer power supply only through the).

  By the way, in order to operate the electronic component E such as a semiconductor element mounted on the wiring board satisfactorily, from the electronic component connection pad 15 (P) for power supply to the external connection pad 16 (P) for power supply and for grounding. The loop impedance between the electronic component connection pad 15 (G) and the ground external connection pad 16 (G) is required to be low. However, according to the analysis of the present inventor, as shown in FIG. 4, for example, a wide area power supply wiring conductor 12 (P) is arranged above a part of the external connection pads 16 (P) for power supply. However, some of the external connection pads 16 (P) for power supply are connected to the upper power supply wiring conductor 12 (P) only through the lowermost power supply wiring conductor 12 (P). The power supply electronic component connection pad 15 (P) to the power supply external connection pad 16 (P) and the grounding electronic component connection pad 15 (G) to the grounding external connection pad 16 (G). It was found that the loop impedance during the period cannot be made sufficiently low.

JP-A-8-172141

  The present invention is mounted with a sufficiently low loop impedance between the power supply electronic component connection pad and the power supply external connection pad and the grounding electronic component connection pad and the grounding external connection pad. It is an object of the present invention to provide a wiring board capable of favorably operating an electronic component such as a semiconductor element.

The wiring board of the present invention is formed on the lower surface of the core insulating layer of the insulating substrate formed by laminating a plurality of build-up insulating layers on the upper and lower surfaces of the core insulating layer. A plurality of first and second grounding or power supply wiring conductors having different large areas, and a plurality of first grounding or power supply wiring conductors electrically connected to the upper surface of the insulating substrate . One grounding or power supply electronic component connection pad and a plurality of second grounding or power supply electronic component connection pads electrically connected to the second grounding or power supply wiring conductor and the insulation A plurality of first grounding or power supply external connection pads electrically connected to the first grounding or power supply wiring conductor on the lower surface of the substrate and the second grounding or power supply wiring conductor Electrically connected to Having a plurality of second external connection pads for ground or power, wherein the first plurality is or power for the first and second grounding of the external connection pads for grounding or power A wiring board formed by being assembled and arranged across a region below the wiring conductor of the first and the builds above all of the first grounding or power supply external connection pads arranged together together with the third wiring conductors for ground or power large area that is connected to the grounding or the wiring conductor of the power supply the first insulating interlayer for up are arranged, disposed to set the first external connection pads for grounding or for power source and the wiring conductors of the said located above the third for grounding or for power source, the first being arranged to set for ground or power Each of the external connection pads And it is characterized in that it is electrically connected to each other via a conductor.

  According to the wiring board of the present invention, above all grounding or power supply external connection pads arranged together on the lower surface of the insulating substrate, the grounding that occupies a part of the insulating layer in the insulating substrate or The wiring conductor for power supply is arranged, and both are electrically connected to each other via via conductors connected to each of the external connection pads. Current paths through via conductors between the external connection pads and the ground or power supply wiring conductors disposed above the external connection pads increase. Therefore, the loop impedance between the electronic component connection pad for power supply and the external connection pad for power supply and from the electronic component connection pad for grounding to the external connection pad for grounding is low, and thereby the semiconductor element to be mounted It is possible to provide a wiring board capable of favorably operating electronic components such as the above.

FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of a wiring board according to the present invention. 2 is an exploded perspective view of a main part of the wiring board shown in FIG. FIG. 3 is a schematic cross-sectional view showing a conventional wiring board. 4 is an exploded perspective view of a main part of 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 is a schematic sectional view showing an example of an embodiment of a wiring board according to the present invention. In FIG. 1, 1 is an insulating substrate, 2 is a wiring conductor layer, 3 and 4 are through conductors, 5 is an electronic component connection pad, and 6 is an external connection pad. These components mainly mount an electronic component E such as a semiconductor element. A wiring board is configured for this purpose.

  The insulating substrate 1 is made of, for example, epoxy resin or bismaleimide triazine on the upper and lower surfaces of a core insulating layer 1a formed by impregnating a glass fabric in which glass fibers are woven vertically and horizontally with a thermosetting resin such as epoxy resin or bismaleimide triazine resin. A plurality of build-up insulating layers 1b made of a thermosetting resin such as a resin are laminated, and a plurality of wirings made of a conductor layer such as a copper foil or a copper plating film on the surface of each insulating layer 1a, 1b A conductor layer 2 is formed, and penetrates through a core insulating layer 1a and penetrates through conductors (hereinafter referred to as through-hole conductors) 3 and build-up insulating layers 1b. 4) is formed.

  The core insulating layer 1a constituting the insulating substrate 1 has a thickness of about 0.2 to 1.5 mm and a plurality of through holes (hereinafter referred to as through holes) having a diameter of about 75 to 300 μm from the upper surface to the lower surface. 7. And the wiring conductor layer 2 is attached to the upper and lower surfaces, and the through-hole conductor 3 is attached to the inner surface of each through-hole 7, and the wiring conductor layers 2 on the upper and lower surfaces of the insulating layer 1a are formed. They are electrically connected through the through-hole conductor 3.

  Such an insulating layer 1a is manufactured by thermally curing a sheet in which a glass fabric is impregnated with an uncured thermosetting resin, and then drilling the sheet from the upper surface to the lower surface. In addition, the wiring conductor layer 2 on the upper and lower surfaces of the insulating layer 1a has a copper foil having a thickness of about 5 to 50 μm attached to the entire upper and lower surfaces of the sheet for the insulating layer 1a, and the copper foil is etched after the sheet is cured. A predetermined pattern is formed by processing. The through-hole conductor 3 on the inner surface of the through-hole 7 is provided with a copper plating film having a thickness of about 5 to 50 μm by electroless plating and electrolytic plating on the inner surface of the through-hole 7 after providing the through-hole 7 in the insulating layer 1a. It is formed by precipitating.

  Further, the insulating layer 1 a is filled with a hole filling resin 8 made of a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin in the through hole 7. The hole-filling resin 8 is for making it possible to form a build-up insulating layer 1b directly above and below the through-hole 7 by closing the through-hole 7, and an uncured paste-like thermosetting resin is used. The through hole 7 is formed by filling the through hole 7 by screen printing and thermally curing it, and then polishing the upper and lower surfaces thereof substantially flatly. The insulating layer 1b is laminated on the upper and lower surfaces of the insulating layer 1a including the hole filling resin 8.

  The insulating layer 1b laminated on the upper and lower surfaces of the insulating layer 1a has a thickness of about 20 to 50 μm and a plurality of through holes (hereinafter referred to as via holes) 9 having a diameter of about 30 to 100 μm from the upper surface to the lower surface of each layer. have. These insulating layers 1b are provided to provide an insulating interval for wiring the plurality of wiring conductor layers 2 with high density, and the insulating layer 1b has vias in the wiring conductor layers 2 and via holes 9 on the surface thereof. A conductor 4 is formed. The upper wiring conductor layer 2 and the lower wiring conductor layer 2 are electrically connected via the via conductor 4 in the via hole 9 so that a high-density wiring can be formed in three dimensions.

  Such an insulating layer 1b is obtained by sticking an uncured thermosetting resin film having a thickness of about 20 to 50 μm to the upper and lower surfaces of the insulating layer 1a, thermosetting it, and drilling the via hole 9 by laser processing, Further, the next insulating layer 1b is sequentially stacked thereon in the same manner. The wiring conductor layer 2 formed on the surface of each insulating layer 1b and the via conductor 4 formed in the via hole 9 are added to the surface of each insulating layer 1b and the via hole 9 every time each insulating layer 1b is formed. It is formed by depositing a copper plating film having a thickness of about 50 μm in a predetermined pattern by a known pattern forming method such as a semi-additive method or a subtractive method.

  Further, in this example, the solder resist layer 10 is deposited on the outermost insulating layer 1b. The solder resist layer 10 is made of an insulating material in which an inorganic powder filler such as silica or talc is dispersed in an acrylic-modified epoxy resin, for example, and has an electrical insulation reliability between the outermost wiring conductor layers 2. It works to increase.

  Such a solder resist layer 10 has a thickness of about 10 to 50 μm, and an uncured resin paste for the solder resist layer 10 having photosensitivity is applied to the outermost insulating layer by using a roll coater method or a screen printing method. It is formed by applying on 1b and drying it, then performing exposure and development processes to form openings for exposing the electronic component connection pads 5 and external connection pads 6, and then thermally curing them. Alternatively, after an uncured resin film for the solder resist layer 10 is stuck on the uppermost insulating layer 1b, this is thermally cured, and then the positions corresponding to the electronic component connection pads 5 and the external connection pads 6 Are formed so as to have openings for exposing the electronic component connection pads 5 and the external connection pads 6 by partially removing the cured resin film.

  The wiring conductor layer 2 formed on the surfaces of the insulating layers 1a and 1b of the insulating substrate 1 is used to connect each electrode T (signal, grounding and power supply electrode) of the electronic component E such as a semiconductor element to an external electric circuit board (non-conductive circuit board). It functions as a conductive path for electrical connection to the figure), corresponding to each electrode T of the electronic component E, signal wiring conductor 2 (S), grounding wiring conductor 2 (G), power supply Each has a wiring conductor 2 (P). A part of the wiring conductor layer 2 provided on the surface of the outermost insulating layer 1b on the upper surface side of the insulating substrate 1 is electrically connected to the electrode T of the electronic component E such as a semiconductor element via the solder bump B1. A part provided on the surface of the outermost insulating layer 1b on the lower surface side of the insulating substrate 1 is formed on the external electric circuit substrate (not shown) via the solder balls B2. Thus, the external connection pads 6 to be electrically connected are formed. These electronic component connection pads 5 and external connection pads 6 are electrically connected to each other via a wiring conductor layer 2, a through-hole conductor 3 and a via conductor 4 provided between the upper and lower surfaces of the insulating substrate 1. . The electronic component connection pad 5 and the external connection pad 6 also correspond to the wiring conductor layer 2 connected to them, and the signal electronic component connection pad 5 (S) and the grounding electronic component connection pad 5 (G). And an electronic component connection pad 5 (P) for power supply, an external connection pad 6 (S) for signal, an external connection pad 6 (G) for grounding, and an external connection pad 6 (P) for power supply ing.

  The signal wiring conductor 2 (S) has a thin belt-like pattern for propagating a high-speed electric signal having a frequency of about 100 M to 10 GHz between the electronic component E to be mounted and an external electric circuit board (not shown). For example, it is provided between the outermost insulating layer 1 b and the next insulating layer 1 b on the upper surface side of the insulating substrate 1. One end of the belt-like pattern is connected to a signal electronic component connection pad 5 provided on the surface of the outermost insulating layer 1b through a via conductor 4 penetrating the outermost insulating layer 1b on the upper surface side of the insulating substrate 1. The other end is connected to the lower surface side of the insulating substrate 1 via the via conductor 4 provided in the insulating layer 1b below the band-like pattern and the through-hole conductor 3 provided in the insulating layer 1a. It is electrically connected to a signal external connection pad 6 (S) provided on the surface of the outermost insulating layer 1b.

  The grounding wiring conductor 2 (G) has a function of supplying a ground potential to the mounted electronic component E and electromagnetically sealing the signal wiring conductor 2 (S) and adjusting a characteristic impedance. Yes. Among these, a part of the grounding wiring conductor 2 (G) formed on the surface of the outermost insulating layer 1 b on the upper surface side of the insulating substrate 1 is exposed from the solder resist layer 10 and is connected to the grounding electronic component connection pad. 5 (G) is formed, and a part of the ground wiring conductor 2 (G) formed on the surface of the outermost insulating layer 1 b on the lower surface side of the insulating substrate 1 is exposed from the solder resist layer 10. An external connection pad 6 (G) for grounding is formed. Further, another part of the grounding wiring conductor 2 (G) formed on the surface or inside of the insulating substrate 1 is two-dimensionally so as to occupy a predetermined region in the wiring conductor layer 2 on the upper surface side or the lower surface side. It has a wide area pattern extending with a wide spread. These grounding wiring conductors 2 (G) are electrically connected to each other via a through-hole conductor 3 provided in the insulating layer 1a and a via conductor 4 provided in the insulating layer 1b.

  The power supply wiring conductor 2 (P) has a function of supplying a power supply potential to the mounted electronic component E and electromagnetically sealing the signal wiring conductor 2 (S) and adjusting a characteristic impedance. Yes. Among these, a part of the wiring conductor 2 (P) for power supply formed on the surface of the outermost insulating layer 1 b on the upper surface side of the insulating substrate 1 is exposed from the solder resist layer 10 and is an electronic component connection pad for power supply. 5 (P) is formed, and a part of the power supply wiring conductor 2 (P) formed on the surface of the outermost insulating layer 1 b on the lower surface side of the insulating substrate 1 is exposed from the solder resist layer 10. An external connection pad 6 (P) for power supply is formed. In addition, another part of the power supply wiring conductor 2 (P) formed on the surface or inside of the insulating substrate 1 is two-dimensional so as to occupy a predetermined region in the wiring conductor layer 2 on the upper surface side or the lower surface side. It has a wide area pattern extending with a wide spread. These power supply wiring conductors 2 (P) are electrically connected to each other through a through-hole conductor 3 provided in the insulating layer 1a and a via conductor 4 provided in the insulating layer 1b.

  Here, the ground wiring conductor 2 (G) and the ground external connection pad 6 (G) connected to the ground wiring conductor 2 (P) and the power supply wiring conductor 2 (P) and the power source connected to the ground wiring conductor 2 (G) in this example An example of the external connection pad 6 (P) is shown in FIG. 2 shows a part of the wiring conductor layer 2 on the lower surface side of the insulating substrate 1 shown in FIG. 1 and the through-hole conductors 3 and via conductors 4 connected to them. The connection position of the via conductor 4 from the wiring conductor layer 2 is shown.

  As shown in FIG. 2, the uppermost wiring conductor layer 2 on the lower surface side of the insulating substrate 1 includes a large area grounding wiring conductor 2 (G) and a large area power supply wiring conductor 2 ( P) adjacent to each other. A plurality of corresponding through-hole conductors 3 are connected to the ground wiring conductor 2 (G) and the power supply wiring conductor 2 (P), respectively.

  In the wiring conductor layer 2 located in the lower layer, the wiring conductor 2 (P) for power supply having a large area occupies most of the wiring conductor layer 2. In this region of this layer, the ground wiring conductor 2 (G) has only a small circular land pattern for connecting the via conductor 4. The land pattern of the power supply wiring conductor 2 (P) and the grounding wiring conductor 2 (G) is obtained by changing the land pattern of the grounding wiring conductor 2 (G) to the power supply wiring conductor 2 (P). They are electrically insulated from each other by openings formed to surround them. The ground wiring conductor 2 (G) and the power wiring conductor 2 (P) correspond to the corresponding upper ground wiring conductor 2 (G) or power wiring conductor via the via conductor 4. 2 (P).

  In the lowermost wiring conductor layer 2, a large area of the grounding wiring conductor 2 (G) occupies the majority. The grounding wiring conductor 2 (G) includes a portion as the grounding external connection pad 6 (G). In this region of this layer, only the power supply external connection pad 6 (P) exists as the power supply wiring conductor 2 (G). A plurality of these external connection pads 6 (P) for power supply are arranged in a collective manner. The external connection pad 6 (P) for power supply and the wiring conductor 2 (G) for grounding are formed so as to surround the external connection pad 6 (P) for power supply in the wiring conductor 2 (G) for grounding. The openings are electrically insulated from one another. The grounding wiring conductor 2 (G) and the power supply external connection pad 6 (P) are connected to the corresponding grounding wiring conductor 2 (G) or power supply wiring via the via conductor 4. It is connected to the conductor 2 (P).

  In the present invention, the power supply wiring conductors 2 (P) are disposed above all the power supply external connection pads 6 (P) arranged together, and the power supply external connection pads 6 are arranged. (P) and the wiring conductor 2 (P) for power supply thereabove are electrically connected to each other through via conductors 4 connected to each of the external connection pads 6 (P) for power supply. With such an arrangement, a current path via the via conductor 4 between the power supply external connection pad 6 (P) and the power supply wiring conductor 2 (P) disposed above the power supply external connection pad 6 (P) is gathered. Many can be secured. As a result, from the electronic component connection pad 5 (P) for power supply to the external connection pad 6 (P) for power supply and from the electronic component connection pad 5 (G) for grounding to the external connection pad 6 (G) for grounding. Therefore, it is possible to provide a wiring board capable of favorably operating the electronic component E such as a semiconductor element to be mounted.

According to the result of the electromagnetic field analysis using the electromagnetic field simulator by the inventor, the analysis model corresponding to the present invention shown in FIG. 2 and the analysis model corresponding to the prior art shown in FIG. As a result, the loop impedance in the analysis model corresponding to the above was reduced by about 5 to 15% from the loop impedance in the analysis model corresponding to the conventional technique.

  In addition, this invention is not limited to an example of above-mentioned embodiment, A various change is possible if it is a range which does not deviate from the summary of this invention. For example, in the above-described example, the case where the external connection pads 6 (P) for power supply are collectively arranged has been described. However, the case where the external connection pads 6 (G) for grounding are collectively arranged is also naturally understood. In this case, the grounding wiring conductor 2 (G) is disposed above all the grounding external connection pads 6 (G) arranged together, and the grounding external connection pads 6 (G Needless to say, the wiring conductor 2 (G) for grounding is electrically connected to each other via the via conductor 4 connected to each of the external connection pads 6 (G) for grounding.

DESCRIPTION OF SYMBOLS 1 Insulating board 1a, 1b Insulating layer 2 (G) Grounding conductor 2 (P) Power source wiring conductor 4 Via conductor 5 (G) Grounding electronic component connection pad 5 (P) Power source electronic component connection Pad 6 (G) External connection pad for grounding 6 (P) External connection pad for power supply

Claims (1)

First and second wide areas different from each other formed adjacent to each other on the lower surface of the core insulating layer of the insulating substrate formed by laminating a plurality of build-up insulating layers on the upper and lower surfaces of the core insulating layer. second and has a wiring conductor for ground or power, the insulating substrate top surface to said first plurality of first grounding or power source electrically connected to the wiring conductor for ground or power Electronic component connection pads, a plurality of second grounding or power supply electronic component connection pads electrically connected to the second grounding or power supply wiring conductor, and the first surface on the lower surface of the insulating substrate . It is electrically connected to the grounding or external connection pad and the second wiring conductor for ground or power electrically connected to the plurality of first grounding or for power supply wiring conductors for power supply Multiple second grounds Or having an external connection pads for power supply, to the lower region of the printed conductors of the plurality is the first and second ground or power of the first external connection pads for grounding or power A wiring board that is assembled and arranged across each other, and is arranged between the build-up insulating layers above all of the first grounding or power supply external connection pads arranged together . A third grounding or power supply wiring conductor having a large area connected to one grounding or power supply wiring conductor is disposed, and the first grounding or power supply arranged in a collective manner. External connection pads and the third grounding or power supply wiring conductors disposed above the external connection pads are connected to the first grounding or power supply external connection pads arranged together. Via each other via conductors Wiring board, characterized in that it is gas-connected.

Images