JP2015170784A - Wiring board, manufacturing method thereof, and wiring board member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring board having a base layer capable of attaining significant cost reduction.SOLUTION: A wiring board includes: a base layer which is made from an inorganic material and is provided with a plurality of holes passing through from a first surface to a second surface; vertical-direction conductors disposed inside each of holes of the base layer so as to have lower surfaces and upper surfaces; first and second insulation layers provided on the first surface and the second surface, respectively; a plurality of first insulation layer through conductors which pass through the first insulation layer to come into contact with each lower surface of the partial vertical-direction conductors of the vertical-direction conductors and are provided not to come into contact with the lower surfaces of the vertical-direction conductors other than the partial vertical-direction conductors; a plurality of second insulation layer through conductors which pass through the second insulation layer to come into contact with each of the upper surfaces of the partial vertical-direction conductors of the vertical-direction conductors and are provided not to come into contact with the upper surfaces of the vertical-direction conductors other than the partial vertical-direction conductors; and first and second wiring patterns provided on each of the first and second insulation layers to come into contact with each of the first and second insulation through conductors.

Description

  The present invention relates to a wiring board for mounting an electronic device, a manufacturing method thereof, and a wiring board member that is a member thereof, and more particularly to a wiring board having an inorganic material layer as a base layer, a manufacturing method thereof, and a wiring board member. .

  In recent years, the use of an inorganic material as a wiring board has been expanded in place of a general material in which a substrate material is an organic material such as an epoxy resin. One example is an interposer that converts terminal arrangements to a coarse pitch, which is used to simplify the mounting of semiconductor chip components on a large wiring board (such as a mother board).

  The interposer is mounted with a semiconductor chip as an electronic device on its surface, and in that form, the interposer is further mounted via a wiring board larger than the interposer, or this form of the interposer is directly mounted on a large wiring board. The interposer also has an action to relieve stress caused by the difference in thermal expansion coefficient between the semiconductor chip itself and the wiring substrate, and it is advantageous to use an inorganic material for the plate material.

  As an example of an interposer, there is a substrate material using silicon similar to a semiconductor chip. In the case of silicon, there is utility that can utilize the technology cultivated in the semiconductor manufacturing process from the viewpoint of forming fine wiring. Another example of an interposer is one that uses glass, which is also an inorganic material, as a substrate material. Although it is not possible to use the processing technology for semiconductors as it is for glass, it is very cheap and promising in terms of cost compared to silicon as a material.

  In general, a wiring board including an interposer requires a custom design with respect to a wiring pattern in a horizontal direction and a vertical direction and a layout arrangement of conductors according to components and circuit configurations mounted thereon. This is very cost-effective. Therefore, it is a great advantage if such an increase in cost can be reduced as much as possible.

JP-A-10-308565

  The present invention relates to a wiring board having an inorganic material layer as at least a base layer for mounting an electronic device, a manufacturing method thereof, and a wiring board capable of achieving a large cost reduction as a base layer in the wiring board member as the member. It aims at providing the manufacturing method and the wiring board member which is the member.

  In order to solve the above problems, a wiring board according to an aspect of the present invention has a first surface and a second surface opposite to the first surface, and the first surface extends to the second surface. The hole of the base layer having a base layer made of an inorganic material provided with a plurality of through-holes, a lower surface continuous with the first surface of the base layer, and an upper surface continuous with the second surface of the base layer A longitudinal conductor disposed inside each of the longitudinal conductors, a first insulating layer provided on the first surface of the base layer, and the first insulating layer; A plurality of first insulating layer penetrating conductors that are in contact with the lower surface of some of the vertical conductors, respectively, but not in contact with the lower surface of the vertical conductors excluding the part And the first insulating layer on the side opposite to the side facing the base layer so as to contact the first insulating layer penetrating conductor. A first wiring pattern provided on the edge layer, a second insulating layer provided on the second surface of the base layer, and the second insulating layer penetrating the second conductor. A plurality of second insulating layer penetrating portions that are in contact with the upper surface of some of the vertical conductors, but are not in contact with the upper surface of the vertical conductors excluding the portion. A conductor and a second wiring pattern provided on the second insulating layer on the side opposite to the side facing the base layer so as to contact the second insulating layer penetrating conductor.

  That is, in this wiring board, the vertical conductor is provided so as to penetrate the base layer. The first insulating layer penetrating conductor and the second insulating layer, which are necessarily different conductors for all the vertical conductors, are provided. It is not configured that the through conductors come into contact. As a result, some vertical conductors provided in the base layer are electrically isolated or dummy. From this point, the configuration of the base layer is a configuration in which the arrangement of the vertical conductors can be set (standardized) in advance without making a custom design. Therefore, it is possible to achieve a significant cost reduction by eliminating the need for custom design for the longitudinal conductor as the base layer.

  Further, in the method for manufacturing a wiring board according to another aspect of the present invention, a step of forming a plurality of through holes in a base layer made of an inorganic material having a first surface and a second surface opposite to the first surface. A plurality of through-holes in the base layer filled with a conductive composition, and a bottom surface that is continuous with the first surface of the base layer and a top surface that is continuous with the second surface of the base layer A step of forming a plurality of directional conductors, a step of laminating a first insulating layer on the first surface of the base layer on which the vertical conductors are formed, and a conductor penetrating the first insulating layer. Forming a plurality of first insulating layer penetrating conductors so as to contact each of the lower surfaces of only a part of the longitudinal conductors, and contacting the first insulating layer penetrating conductors; As described above, the first wiring pattern is formed on the first insulating layer on the side opposite to the side facing the base layer. A step of laminating a second insulating layer on the second surface of the base layer on which the longitudinal conductor is formed, and a second conductor that is a conductor penetrating the second insulating layer. Forming a plurality of insulating layer through conductors in contact with each of the upper surfaces of only a part of the longitudinal conductors, and contacting the second insulating layer through conductors; Forming a second wiring pattern on the second insulating layer on the side opposite to the side facing the base layer.

  This manufacturing method is one aspect for manufacturing the wiring board.

  Moreover, the wiring board member which is another aspect of this invention has a 1st surface and the 2nd surface on the opposite side to this 1st surface, The area | region of at least one part of this 1st, 2nd surface A base layer made of an inorganic material in which a plurality of holes penetrating from the first surface to the second surface have the same diameter in a lattice dot or staggered arrangement, and a bottom surface that is continuous with the first surface of the base layer And a vertical conductor disposed inside each of the holes of the base layer so as to have an upper surface continuous with the second surface of the base layer, and a first provided on the first surface of the base layer And a second insulating layer provided on the second surface of the base layer.

  Such regular provision of the longitudinal conductors in the base layer is typically suitable for universalization (standardization) as the base layer, and as a result, a significant cost reduction can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the big cost reduction as a base layer can be achieved in the wiring board which has an inorganic material layer as a base layer for mounting an electronic device, its manufacturing method, and the wiring board member which is the member.

Sectional drawing which shows typically the structure in the case of an interposer as an example of the wiring board which is one Embodiment. The top view which shows an example of the glass base layer 11 shown in FIG. The top view which shows another example of the glass base layer 11 shown in FIG. Process drawing which shows the process in which the interposer shown in FIG. FIG. 5 is a continuation diagram of FIG. 4, and a process diagram schematically showing a process of manufacturing the interposer shown in FIG. 1. FIG. 6 is a continuation diagram of FIG. 5, and is a process diagram schematically illustrating a process of manufacturing the interposer illustrated in FIG. 1. The top view which shows the modification of the glass base layer shown in FIG. 2, FIG. The top view which shows another modification of the glass base layer shown in FIG. 2, FIG.

  As an embodiment of the present invention, the base layer may be made of glass. As an inorganic material, glass is very inexpensive and is advantageous in that respect compared to silicon, which is the same inorganic material.

  Further, as an embodiment, the longitudinal conductor can be made of a conductive composition. By using the conductive composition, it can be formed by screen printing, for example, and the production efficiency is improved. Instead of the conductive composition, for example, a vertical conductor made of copper grown by plating can be used.

  As an embodiment, a plurality of the vertical conductors may be provided in the lattice layer or staggered arrangement with the same diameter in at least a part of the base layer. The regular provision of the longitudinal conductors in the base layer as described above is typically suitable for universalization (standardization) as the base layer.

  In addition, as an embodiment, the vertical conductor in contact with the first insulating layer penetrating conductor is limited to any one of the vertical conductors provided in a latticed or staggered arrangement, The vertical conductors in contact with the second insulating layer penetrating conductors may be limited to any one of the vertical conductors provided in a latticed or staggered arrangement.

  In this aspect, since the longitudinal conductors of the base layer used electrically are selected from those provided in a latticed or zigzag arrangement, a custom design for the arrangement of the longitudinal conductors is required. The advantage of not being thorough. That is, even if there are longitudinal conductors that are not provided in a grid or staggered arrangement, they are not used electrically and lose the meaning of custom design.

  Further, as an embodiment, the vertical conductor is arranged so that the first insulating layer penetrating conductor does not cover a part of the lower surface of the vertical conductor that the first insulating layer penetrating conductor contacts. The vertical conductor so that the second insulating layer penetrating conductor does not cover a part of the upper surface of the vertical conductor that the second insulating layer penetrating conductor contacts. It can be said that it is touching.

  This is because the material of the base layer, which is the penetration layer, is an inorganic material instead of a resin while the longitudinal conductor is formed of a conductive composition, so that release of moisture and gas from the conductive composition as a source. This is a mode corresponding to the fact that the base layer does not function as a route. For this reason, the first and second insulating layer penetrating conductors are provided so as not to cover a part of the upper and lower surfaces of the vertical conductor. Therefore, moisture and gas using the conductive composition as a source can be released from a region that is not covered with at least the first and second insulating layer penetrating conductors, thereby improving reliability.

  Based on the above, embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing the configuration of an interposer as an example of a wiring board according to an embodiment.

  As shown in the figure, this interposer includes a glass base layer 11, a resin layer (interlayer insulating layer) 12, 13, 14, 15, via-hole plated via 21a (first insulating layer through conductor), via-hole plated via. 21c, via hole plating via 22a (second insulating layer through conductor), via hole plating via 22c, wiring patterns 21b, 21d, 22b, 22d, nickel gold plating layers 21e, 22e, longitudinal conductor (through conductor) 31, Wiring cover films (solder resist films) 41 and 42 and solder balls 51 are provided.

  As an outline, in this interposer, a semiconductor chip (not shown) is mounted by, for example, flip chip bonding using a portion of the nickel gold plating layer 22e on the upper surface in the drawing as a connection land, while the solder ball 51 on the lower surface in the drawing is shown. The entire structure can be surface-mounted on another larger resin wiring board (not shown). The arrangement pitch of the lands having the nickel gold plating layer 22e is a narrow pitch corresponding to the terminals of the semiconductor chip (not shown), and the solder balls 51 are arranged at a wider pitch.

  The interposer simplifies the mounting of semiconductor chip components with a narrow terminal pitch on a large wiring board (such as a mother board). In addition, the nickel gold plating layer 22e is not formed, but a form in which copper metal bumps are formed on the wiring pattern 22d instead is also conceivable. In this case, this metal bump is connected to another metal bump (terminal) provided on the surface of the semiconductor chip for mounting a semiconductor chip (not shown).

  The connection land having the nickel gold plating layer 22e is electrically connected to the wiring pattern 22d, the via hole plating via 22c, the wiring pattern 22b, the via hole plating via 22a, the vertical conductor 31, the via hole plating via 21a, and the wiring pattern 21b. The via hole plating via 21c, the wiring pattern 21d, and the nickel gold plating layer 21e are electrically connected to the solder ball 51.

  While the above-described longitudinal and lateral conductor portions are present, the glass base layer 11, the resin layers 12, 13, 14, 15 and the wiring cover films 41 and 42 are insulators. Can be arranged (or protected) as desired as shown. Among the insulators, the glass base layer 11 is a layer corresponding to a core layer using glass as the name suggests, and since the coefficient of thermal expansion is considerably smaller than that of a resin material, a semiconductor chip (non-conductive) attached to the interposer is used. It is possible to greatly reduce the stress caused by the difference in coefficient of thermal expansion from that shown in the figure.

  More specifically with respect to the resin layer, the resin layer 12 (13) fills the space between the plurality of via-hole plated vias 21a (22a) that are in convex contact with the lower surface (upper surface) of the longitudinal conductor 31. It is a resin layer that functions. A wiring pattern 21b (22b) is formed on the resin layer 12 (13). Vias 21c (22c) are formed through the resin layer 14 (15) provided on the resin layer 12 (13) and the wiring patterns 21b (22b), and further, a wiring pattern 21d (22d) is provided thereon. It is done.

  The longitudinal conductors 31 provided through the glass base layer 11 are conductors made of a conductive composition disposed in via holes 11 a formed through the glass base layer 11, and are provided on both surfaces of the glass base layer 11. The upper surface and the lower surface are connected. By using a conductive composition as the vertical conductor 31, it can be formed by screen printing, for example, and the production efficiency can be improved. As shown in the figure, the longitudinal conductor 31 is not necessarily configured to be in contact with via-hole plated vias 21a and 22a which are different conductors.

  In other words, the vertical conductor 31 includes one that is actually used electrically and one that is electrically isolated or dummy. In other words, only the longitudinal conductor 31 that is actually used electrically is brought into contact with the via-hole plated vias 21a and 22a and functions electrically. “Electrically isolated” means the case of a vertical conductor in which the plating vias are not in contact with both the upper and lower surfaces, and “dummy” means plating only one of the upper and lower surfaces. It means the case of a longitudinal conductor in contact with a via.

  FIG. 2 is a plan view showing an example of the glass base layer 11 shown in FIG. In FIG. 2, the same components as those shown in FIG. As shown in FIG. 2, the glass base layer 11 is provided with a plurality of via holes 11a having the same diameter so as to penetrate the base layer 11 and have a plurality of rows and columns of via holes 11a.

  With such a configuration of the base layer 11, it can be said that the arrangement of the vertical conductors 31 is universalized, and a custom design relating to the arrangement of the vertical conductors 31 as the base layer 11 is completely unnecessary. That is, various types of interposers can be flexibly manufactured using the base layer 11 as a common member. In that case, custom design as an interposer is performed exclusively at the arrangement positions of the plating vias 21a and 22a in the via holes. According to this, the construction period can be shortened, and an interposer in which the cost reduction is achieved as the base layer 11 is obtained.

  FIG. 3 is a plan view showing another example of the glass base layer 11 shown in FIG. In FIG. 3, the same components as those shown in FIG. As shown in FIG. 3, the glass base layer 11 is provided with a plurality of via holes 11a having the same diameter in a staggered arrangement through the base layer 11. Such a configuration of the base layer 11 also provides the same effect as that of the base layer 11 shown in FIG.

  Note that the staggered arrangement shown in FIG. 3 has an advantage that the arrangement density of the via holes 11a can be increased as compared with the lattice point arrangement shown in FIG. The difference in arrangement density will be described below. In the lattice point arrangement shown in FIG. 2, the arrangement pitches of the via holes 11a in the vertical and horizontal directions are set according to a fixed rule. This is also applied when viewed through the nearest 2 × 2 via holes 11a (arranged to form a square vertex).

  On the other hand, in the zigzag arrangement shown in FIG. 3, when the horizontal arrangement pitch is the same as in the arrangement shown in FIG. 2, when viewing the via hole 11a arranged at the apex of the nearest equilateral triangle, the equilateral triangle Is smaller than the arrangement pitch in the vertical direction in FIG. This can be easily understood by comparing the above square with this equilateral triangle. Thereby, in the staggered arrangement shown in FIG. 3, the number of rows of the plurality of via holes 11a arranged can be increased as compared with the lattice point arrangement shown in FIG. Specifically, in the lattice point arrangement shown in FIG. 2, the number of rows is 15, whereas in the staggered arrangement shown in FIG. 3, the number of rows is 17. In terms of the number of via holes 11a, the arrangement density is increased by 225 in FIG. 2 and 247 in FIG.

  Incidentally, in general, the staggered arrangement includes not only a regular triangle but also an isosceles triangle as an arrangement at the apex of the nearest triangle. In that case, the arrangement density is slightly inferior to the case of the staggered arrangement in which equilateral triangle arrangements are gathered. In other words, the set of equilateral triangle arrangements is a close-packed arrangement that maintains a certain distance from the adjacent one. The higher the arrangement density of the via holes 11a, the greater the degree of freedom for custom designing the arrangement positions of the via-hole plated vias 21a and 22a.

  Although one embodiment has been described above, supplementary explanation will be given below. The structure of the resin layers 12 to 15 which are wiring interlayer insulation layers, and conductors that are in contact with or electrically connected to the longitudinal conductor 31 (via-hole plating vias 21a, wiring patterns 21b, via-hole plating vias 21c, wiring patterns 21d, via holes For the configuration of the inner plating via 22a, the wiring pattern 22b, the via hole inner plating via 22c, and the wiring pattern 22d), various known configurations can be used. The number of insulating layers and wiring patterns can be arbitrarily selected as necessary.

  For example, the via-hole plated via may be replaced with a via made of a conductive composition. For the wiring pattern, in addition to subtractive formation by etching a metal foil (for example, copper foil), additive formation such as application of a conductive paste (for example, metal nanopaste) or formation by plating can be employed. Various known materials can be used for the specific material of the resin layer and the specific material of each conductor.

  In addition, with respect to the via hole 11a, a metal (for example, copper) plating layer is formed on the inner wall surface, in addition to the longitudinal conductor 31 made of the conductive composition facing the glass material of the inner wall surface as it is. Alternatively, the longitudinal conductor 31 may be formed by filling the conductive composition. In this way, a lower resistance can be formed as the longitudinal conductor. In this case, since the vertical conductor is increased in size in the horizontal direction by the formation thickness of the plating layer, the plating layer is formed thinner to prevent the arrangement density of the vertical conductors 31 from being lowered. pay attention to.

  Further, when the longitudinal conductor 31 is formed of a conductive composition, the material of the glass base layer 11 that is the penetration layer is not a resin but an inorganic material. The glass base layer 11 does not function as a discharge path. Therefore, the via-hole plated vias 21a and 22a are preferably provided so as not to cover a part of the upper and lower surfaces of the vertical conductor 31 as shown in the drawing. As a result, moisture and gas originating from the conductive composition can be released through the resin layers 12 and 13 from at least the regions not covered with the via-hole plated vias 21a and 22a, and their retention can be reduced. This can improve the reliability.

  Further, regarding the longitudinal conductor 31, in addition to using a conductive composition as the material, it is also conceivable that the material is copper grown in the via hole 11a by plating, for example.

  Further, the via-hole plated via 21a (22a) and the longitudinal conductor 31 may be configured such that one electrical node is constituted by the plurality of longitudinal conductors 31. Specifically, a plurality of vias 21a (22a) are provided in contact with the wiring pattern 21b (22b), and a plurality of vertical conductors 31 exist so as to contact the plurality of vias 21a (22a). is there. With such a configuration, the defect rate as one node becomes a value obtained by multiplying the defect rates of the individual vertical conductors 31 themselves by a plurality of the failure rates, so that it can be greatly improved.

  Moreover, about the raw material of the glass base layer 11, it is preferable to use glass like this form from the viewpoint of low cost. Glass can be easily made large, and if an enlarged base layer is used, a large number of interposers can be efficiently manufactured with multiple faces. However, not only glass but other inorganic materials, for example, a semiconductor plate such as silicon may be used. In the case of using silicon, for example, after forming a via hole 11a in the silicon base layer, this silicon base layer is subjected to a thermal oxidation process, and a thermal oxide film (= insulation) is formed on the entire surface including the inner wall surface of the via hole 11a. If a film is formed, insulation between the conductors can be secured even if conductors are positioned in the via holes 11a.

  Next, an outline of a procedure for manufacturing the interposer shown in FIG. 1 will be described with reference to FIGS. In these drawings, the same or equivalent parts as shown in FIG. First, a glass base layer 11 before processing (assumed thickness is 50 μm to 1000 μm, for example, typically 500 μm) is prepared, and a via hole 11a is formed at a predetermined location by, for example, laser processing (FIG. 4A). )). The diameter of the via hole 11a is, for example, 60 μm. In addition to the laser processing, the pore diameter may be enlarged or the inner wall of the hole may be smoothed with hydrofluoric acid. Moreover, if photoreactive glass is used as the glass base layer 11, the drilling process becomes easier.

  Next, the formed via hole 11a is filled with a conductive composition to be the longitudinal conductor 31 by using, for example, screen printing. The screen plate used at this time is provided with printing holes (pits) at positions corresponding to the positions of the via holes 11a. The conductive composition to be printed is a well-known composition having fine metal particles (for example, silver particles) dispersed in a thermosetting resin and having conductivity as a whole.

  Once the via hole 11a is filled with the conductive composition, the conductive composition is then dried and further thermally cured. When the conductive composition is dried and cured, the vertical conductor 31 is formed (see FIG. 4B). The manufacturing process related to the glass base layer 11 has been described above. Thereafter, as will be described below, the resin layers 12 to 15 and the wiring layer portion including each conductor can be formed using a known process. In addition, when forming a longitudinal direction conductor with plating quality instead of a conductive composition, it replaces with screen printing and performs a plating process. In the case of performing the plating process, a certain process is required as a pre-stage and a post-stage in accordance with a known method.

  It is the following about formation of the wiring layer part containing the resin layers 12-15 and each conductor which is the next step. First, the resin layers 12 and 13 are laminated and formed on the upper and lower surfaces of the glass base layer 11 after the conductive composition is through-filled (see FIG. 4C). The resin layers 12 and 13 can be formed by, for example, using a thermosetting resin and laminating the uncured state at the beginning and curing it by heating and pressing. Alternatively, it may be formed by applying a liquid resin and then heat-curing it. If the resin layers 12 and 13 have photosensitivity (for example, photosensitive polyimide resin), this can be utilized in the next step.

  After the resin layers 12 and 13 are formed, next, via holes 21h and 22h are formed in the resin layers 12 and 13 corresponding to the positions of the via-hole plated vias 21a and 22a to be formed, for example, by laser processing (see FIG. 5 (a)). Here, when a resin layer having photosensitivity is used as the resin layers 12 and 13, the via holes 21h and 22h can be formed by a pattern to be exposed. After forming the via holes 21h and 22h, a plating process is performed so as to fill the via holes 21h and 22h and form the wiring patterns 21b and 22b (see FIG. 5B).

  The wiring patterns 21b and 22b can be provided by a process or method different from that of the vias 21a and 22a. That is, for example, (1) metal foil (copper foil) is stacked and etched, (2) metal (copper) pattern is formed using processes such as sputtering, vapor deposition, and plating, (3) conductivity A conductive pattern can be formed by applying a paste (for example, a metal nanopaste) or the like.

  After the formation of the wiring patterns 21b and 22b, the laminated formation of the resin layers 14 and 15, the formation of the via holes 21g and 22g for the vias 21c and 22c (see FIG. 6A), and the vias 21c and 22c are sequentially performed. Then, the wiring patterns 21d and 22d are formed (see FIG. 6B). These points are the same as those described for the formation of the resin layers 12 and 13, the formation of the via holes 21h and 22h for the vias 21a and 22a, and the formation of the vias 21a and 22a and the wiring patterns 21b and 22b, respectively. .

  After the formation of the wiring patterns 21d and 22d is completed, the wiring cover films 41 and 42 are formed, and then the nickel gold plating layers 21e and 22e are formed. From the above, the interposer shown in FIG. 1 can be manufactured. The solder ball 51 is actually attached in many cases after the semiconductor chip is mounted on the connection land on which the nickel gold plating layer 22e is formed.

  By the way, as a special point in the manufacturing process, the wiring board member, which is an intermediate member in the process of manufacturing shown in FIG. 4C, can be used as a common member for flexibly manufacturing various types of interposers. ing. Therefore, it is considered useful to distribute this as an intermediate product. If this intermediate member is provided with an alignment mark for guiding the position of the longitudinal conductor 31 arranged buried in the resin layers 12 and 13, it is easy to handle thereafter. The alignment mark can be provided so as to reflect and align the position of the longitudinal conductor 31 on the surface of the resin layers 12 and 13, for example. In the case where the resin layers 12 and 13 are transparent (for example, polyimide is used) and are thin (for example, about 5 μm thick), an alignment mark may be provided on the surface of the glass base layer 11.

  Next, a modified example of the interposer shown in FIG. 1 will be described below. FIG. 7 is a plan view showing a modification of the glass base layer shown in FIGS. 2 and 3. In the interposer shown in FIG. 1, a glass base layer 11 having a structure as shown in FIG. 7 may be incorporated in place of the glass base layer 11 shown in FIGS.

  In the glass base layer 11, via holes 11 a arranged in a lattice point form exist, while via holes 11 a arranged so as not to follow the regular arrangement exist in some regions. The latter via hole 11a can be arranged by custom design. Even in the case of such a configuration, in the region where the via holes 11a arranged in lattice points are present, universalization is realized as described above. In comparison, the base layer 11 has an advantage that cost reduction is achieved.

  Of course, all the via holes 11a that do not follow the regular arrangement can be provided on the premise that they are for the longitudinal conductors 31 that actually function electrically. However, the vertical conductor 31 provided in a part thereof does not cause any functional inconvenience even if it is electrically isolated or dummy. Furthermore, regarding the via holes 11a that do not follow the regular arrangement, even if all the vertical conductors 31 are electrically isolated or dummy, no functional inconvenience is caused.

  If all the longitudinal conductors 31 provided in the via holes 11a arranged in a non-regular arrangement are electrically isolated or dummy, the via holes 11a are no longer customized. It can be said that the meaning of arranging is lost, and the arrangement is seemingly a custom design, but it is not actually a custom design.

  Next, FIG. 8 is a plan view showing another modification of the glass base layer shown in FIGS. In the interposer shown in FIG. 1, a glass base layer 11 having a structure as shown in FIG. 8 may be incorporated in place of the glass base layer 11 shown in FIGS.

  In the glass base layer 11, via holes 11 a arranged in lattice points are present, but the via holes 11 a are not provided in some regions. In general, the region where the via hole 11a exists and the region where the via hole 11a does not exist can be distributed and arranged in any way by a kind of custom design. In this example, the via hole 11a is not particularly provided in the central portion of the base layer 11 because the arrangement position of the semiconductor chip (not shown) to be attached is taken into consideration.

  When the semiconductor chip is attached corresponding to the central portion of the glass base layer 11, the base layer 11 having via holes 11a arranged as shown in FIG. 8 is advantageous. This is because the effective lateral expansion coefficient of the glass base layer 11 in the region where the semiconductor chip should be located does not change from the expansion coefficient of the glass material itself, while the effective lateral expansion in other regions. This is because the rate increases so as to approach the expansion coefficient of the vertical conductor 31 according to the material of the vertical conductor 31.

  In other words, this allows the expansion coefficient in the lateral direction of the semiconductor chip (not shown) and the interposer to be locally aligned while the interposer and the wiring board (not shown; made of resin) on which the interposer itself is mounted. It can comprise so that the expansion coefficient of a horizontal direction may be arranged more. In particular, when the arrangement density of the vertical conductors 31 is high, the equivalent expansion coefficient of the glass base layer 11 approaches that of the resin wiring board. That is, in terms of the coefficient of thermal expansion, it is possible to provide a glass interposer that has a higher ability to relieve stress between a semiconductor chip (not shown) and a resin wiring board (not shown) and produces good buffering properties.

  Even in the case of the configuration having the glass base layer 11 shown in FIG. 8, of course, the universalization is realized as described above in the region where the via holes 11 a arranged in the lattice points are present. As an advantage, cost reduction can be achieved.

  In the above description of the embodiment, the case of an interposer is given as an example. However, as described above, a large cost reduction as a base layer can be achieved even in the case of a general wiring board as well as the interposer. The point of the effect does not change.

  DESCRIPTION OF SYMBOLS 11 ... Glass base layer, 11a ... Via hole, 12, 13, 14, 15 ... Resin layer (wiring interlayer insulation layer), 21a, 21c, 22a, 22c ... Plating via in a via hole, 21b, 21d, 22b, 22d ... Wiring pattern 21e, 22e ... nickel gold plating layer, 21h, 21g, 22h, 22g ... via hole, 31 ... longitudinal conductor, 41, 42 ... wiring cover film (solder resist film), 51 ... solder ball.

Claims (8)

A base layer made of an inorganic material having a first surface and a second surface opposite to the first surface, and a plurality of holes penetrating from the first surface to the second surface;
A longitudinal conductor disposed inside each of the holes of the base layer to have a lower surface continuous to the first surface of the base layer and an upper surface continuous to the second surface of the base layer;
A first insulating layer provided on the first surface of the base layer;
While penetrating the first insulating layer and contacting the lower surface of some of the vertical conductors, respectively, the lower surface of the vertical conductor excluding the part A plurality of first insulating layer through conductors provided without contact with each other;
A first wiring pattern provided on the first insulating layer on the side opposite to the side facing the base layer so as to contact the first insulating layer through conductor;
A second insulating layer provided on the second surface of the base layer;
While penetrating the second insulating layer and contacting each of the upper surfaces of some of the vertical conductors, the upper surfaces of the vertical conductors excluding the portion of the vertical conductors A plurality of second insulating layer through conductors provided without contact with each other;
A wiring board comprising: a second wiring pattern provided on the second insulating layer on the side opposite to the side facing the base layer so as to contact the second insulating layer penetrating conductor.   The wiring board according to claim 1, wherein the base layer is made of glass.   The wiring board according to claim 1, wherein the longitudinal conductor is made of a conductive composition.   2. The wiring board according to claim 1, wherein a plurality of the longitudinal conductors are provided with the same diameter in a lattice-point shape or a staggered arrangement in at least a partial region of the base layer. The longitudinal conductor that the first insulating layer through conductor contacts is limited to one of the longitudinal conductors provided in a latticed or staggered arrangement,
The wiring board according to claim 4, wherein the vertical conductors in contact with the second insulating layer penetrating conductors are limited to any one of the vertical conductors provided in a latticed pattern or a staggered arrangement. The first insulating layer penetrating conductor is in contact with the vertical conductor so as not to cover a part of the lower surface of the vertical conductor that the first insulating layer penetrating conductor contacts;
The second insulating layer through conductor is in contact with the vertical conductor so as not to cover a part of the upper surface of the vertical conductor with which the second insulating layer through conductor is in contact. Item 4. The wiring board according to Item 3. Forming a plurality of through holes in a base layer made of an inorganic material having a first surface and a second surface opposite to the first surface;
The conductive layer is filled in the plurality of through holes of the base layer with a conductive composition, and has a lower surface continuous with the first surface of the base layer and an upper surface conductive with the second surface of the base layer. Forming a plurality of bodies;
Laminating a first insulating layer on the first surface of the base layer on which the longitudinal conductor is formed;
Forming a plurality of first insulating layer through conductors, which are conductors penetrating the first insulating layer, so as to contact each of the lower surfaces of only a part of the longitudinal conductors of the longitudinal conductors; When,
Forming a first wiring pattern on the first insulating layer on the side opposite to the side facing the base layer so as to contact the first insulating layer through conductor;
Laminating a second insulating layer on the second surface of the base layer on which the longitudinal conductor is formed;
Forming a plurality of second insulating layer penetrating conductors that are conductors penetrating the second insulating layer so as to be in contact with each of the upper surfaces of only a part of the longitudinal conductors of the longitudinal conductors; When,
Forming a second wiring pattern on the second insulating layer on the side opposite to the side facing the base layer so as to be in contact with the second insulating layer penetrating conductor. Method. A hole having a first surface and a second surface opposite to the first surface, and a hole penetrating from the first surface to the second surface in at least a part of the first and second surfaces is a lattice. A base layer made of an inorganic material having a plurality of dots or staggered arrangements having the same diameter;
A longitudinal conductor disposed inside each of the holes of the base layer to have a lower surface continuous to the first surface of the base layer and an upper surface continuous to the second surface of the base layer;
A first insulating layer provided on the first surface of the base layer;
A wiring board member comprising: a second insulating layer provided on the second surface of the base layer.

Images