Patent ID: 12255151

DETAILED DESCRIPTION OF THE DISCLOSURE

The dimension ratio illustrated in the drawings does not always exactly correspond to the real one, and the dimension ratio is exaggerated in some cases for the sake of convenience of description. The notion “upper” and “lower” referred to in the following description does not always mean the absolutely upper and lower positions and may mean relatively upper and lower positions in an attitude illustrated in the drawings.

First Embodiment

Referring toFIG.1andFIG.2, a module in a first embodiment based on the present disclosure will be described. A module101in the present embodiment is shown inFIG.1. A cross-sectional view as viewed from the arrow II-II inFIG.1is shown inFIG.2.

Module101in the present embodiment includes a substrate1, a first component31, a first sealing resin6a, and a heat dissipation portion5. Substrate1is a multi-layer substrate formed by laminating a plurality of insulating layers2. Insulating layers2are ceramic layers but not limited thereto and may be, for example, resin layers. First component31is, for example, a semiconductor device such as an IC. Substrate1has a first main surface1a. Substrate1includes wiring. In the example described here, the wiring includes internal wiring13. On first main surface1a, components3aand3bare mounted in addition to first component31. First component31has a circuit surface31a. Circuit surface31ais a portion through which electricity flows and may heat during the operation of first component31. First component31is mounted on first main surface1asuch that circuit surface31afaces first main surface1a. First component31has a ground terminal10on circuit surface31a. First sealing resin6ais disposed to cover first main surface1aand first component31. Heat dissipation portion5is provided along the upper surface of first sealing resin6a. As used herein “provided along the upper surface” is not limited to being provided in direct contact. In other words, heat dissipation portion5is not necessarily in direct contact with the upper surface of first sealing resin6a. Another layer may be interposed between heat dissipation portion5and the upper surface of first sealing resin6a. In the example described here, a shield film8is formed to cover first sealing resin6a. Heat dissipation portion5is disposed on the upper side of shield film8. In other words, shield film8is interposed between heat dissipation portion5and the upper surface of first sealing resin6a. The wiring of substrate1is connected to ground terminal10. Module101further includes a heat conducting member7connecting the wiring and heat dissipation portion5. In other words, heat conducting member7is disposed to transmit the heat from the wiring to heat dissipation portion5.

Module101is configured such that the heat generated in first component31is transmitted from ground terminal10on circuit surface31aof first component31to heat conducting member7via internal wiring13and further transmitted to heat dissipation portion5. Heat conducting member7is, for example, a pillar-shaped conductor. Heat conducting member7may be, for example, a metal pin. Heat conducting member7may be formed by filling a depression with a conductive paste. Heat conducting member7may be formed by plating growth. The upper end of heat conducting member7is in contact with shield film8. The heat transmitted to the upper end of heat conducting member7is transmitted to heat dissipation portion5via shield film8. Although an example having shield film8has been described here, the presence of shield film8is not essential.

Substrate1has a second main surface1bas a surface on the opposite side to first main surface1a. An external connection terminal15is disposed on second main surface1b. A conductor via16is connected to external connection terminal15. Conductor via16penetrates insulating layer2included in substrate1in a thickness direction. Substrate1includes a conductor pattern14in its inside.

In the present embodiment, the wiring of substrate1is connected to ground terminal10of first component31, and heat conducting member7is disposed such that the heat is transmitted from the wiring to heat dissipation portion5. Thus, since the heat is dissipated through a shorter path from the circuit portion that is a heating section, the heat generated in first component31can be transmitted efficiently to heat dissipation portion5via heat conducting member7. The heat dissipation from a component in the module thus can be enhanced.

As described in the present embodiment, heat conducting member7is preferably a pillar-shaped conductor. With this configuration, the heat can be transmitted efficiently.

As described in the present embodiment, heat dissipation portion5is preferably a heat dissipation member disposed on the upper side of first sealing resin6a. The heat dissipation member may be a member provided as a separate portion from heat conducting member7. The heat dissipation member may be various materials. The heat dissipation member may be, for example, a plate formed of a metal having excellent heat dissipation characteristics, such as aluminum. In terms of preventing peeling of the heat dissipation member due to a difference in thermal expansion coefficient between the heat dissipation member and the mold resin, the heat dissipation member may be a copper-aluminum cladding material.

As described in the present embodiment, it is preferable that shield film8at least covering first sealing resin6ais provided, and the heat dissipation member is disposed outside of shield film8. With this configuration, the module less affected by the outside can be formed.

As described in the present embodiment, the wiring may include internal wiring13provided within substrate1. This configuration can prevent the displacement of heat conducting member7due to the solder flow between the electrodes for connecting ground terminal10and heat conducting member7.

Second Embodiment

Referring toFIG.3, a module in a second embodiment based on the present disclosure will be described. A module102in the present embodiment is shown inFIG.3. Double-sided mounting is performed in module102. More specifically, in module102, substrate1has second main surface1bon the opposite side to first main surface1a, and a second component32is mounted on second main surface1b. Second component32is disposed in a region A in which first component31is projected onto second main surface1b. On second main surface1b, components3cand3dare mounted in addition to second component32. The other configuration is similar to module101described in the first embodiment.

The present embodiment also achieves an effect similar to that in the first embodiment. In particular, when second component32is provided in region A in this way, it is difficult to provide a conductor pillar for the heat dissipation from first component31so as to penetrate substrate1. However, module102has heat conducting member7disposed to transmit the heat from the wiring to heat dissipation portion5and thus avoids the problem of region A difficult to use for the heat dissipation, so that the heat can be dissipated efficiently via heat conducting member7. Furthermore, second component32can be less affected by the heat. In addition, since a through conductor for the heat dissipation need not be provided in substrate1that is a wiring board, the flexibility in design in the wiring board is increased.

Third Embodiment

Referring toFIG.4andFIG.5, a module in a third embodiment based on the present disclosure will be described. A module103in the present embodiment is shown inFIG.4. A cross-sectional view as viewed from the arrow V-V inFIG.4is shown inFIG.5.

In module103, the heat dissipation portion is provided not on the upper side but on the lower side of shield film8. Here, a heat dissipation portion5iis provided as the heat dissipation portion. Heat dissipation portion5icovers not the whole but only a part of the upper surface of first sealing resin6a. Module103includes shield film8at least covering first sealing resin6a. The heat dissipation member as heat dissipation portion5iis disposed on the lower side of shield film8, first component31and components3aand3bare mounted as a plurality of components on first main surface1a, and the heat dissipation member extends to a position lower than the upper surface of the highest component3bamong the components.

Heat dissipation portion5ican be formed by forming first sealing resin6a, first, and then performing removal processing on the upper surface of first sealing resin6ato form a depression, and inserting the heat dissipation member in the depression.

With this configuration, when first component31heating most is a component different from the highest component, the lower end of the heat dissipation member can be disposed closer to first component31. The heat dissipation from first component31therefore can be performed efficiently. Since heat dissipation portion5iis disposed so as not to overlap with component3b, the height of the entire module103can be reduced.

As another modification, a module104shown inFIG.6can be contemplated. Module104includes the heat dissipation member as a heat dissipation portion5j. First component31heating most has a height smaller than component3b. The heat dissipation member extends to a position lower than the upper surface of component3b. The lower surface of the heat dissipation member is affixed to the upper surface of first component31by adhesive11. Adhesive11does not necessarily serve a function as a heat dissipation path. Heat dissipation from first component31to heat dissipation portion5jis mainly performed via heat conducting member7. Heat dissipation portion5jis disposed to cover a region corresponding to first component31. Heat dissipation portion5jis disposed to encompass a region in which first component31is projected upward.

To form heat dissipation portion5j, any heat dissipation member is mounted on the upper surface of first component31through adhesive11before forming first sealing resin6a. In doing so, the heat dissipation member is disposed in contact with the upper end of heat conducting member7. First sealing resin6ais formed to fill the periphery of the heat dissipation member after the heat dissipation member is mounted.

Fourth Embodiment

Referring toFIG.7andFIG.8, a module in a fourth embodiment based on the present disclosure will be described. A module105in the present embodiment is shown inFIG.7. A cross-sectional view as viewed from the arrow VIII-VIII inFIG.7is shown inFIG.8.

In module101described in the first embodiment, the heat dissipation path from ground terminal10of first component31to heat conducting member7passes through internal wiring13. However, in module105described in the present embodiment, the heat dissipation path from ground terminal10of first component31to heat conducting member7passes through surface layer wiring12.

The present embodiment also achieves an effect similar to that in the first embodiment. Since the heat dissipation path passes through surface layer wiring12, the heat dissipation path can connect to the heat dissipation member with the shortest distance from the heating first component31. However, in this configuration, the land electrode is large only on the periphery of the ground terminal10on a surface of substrate1. In order to prevent an undesired flow of solder, therefore, the upper surface of the land electrode may be covered with a resist film to interrupt a flow of solder. In other words, in order to prevent the solder from flowing along the upper surface of surface layer wiring12, a resist film may be placed to cover at least a part of the upper surface of surface layer wiring12, more specifically, a portion between a connection section of ground terminal10of first component31and a connection section of heat conducting member7. The resist film thus provided can serve a function like a dam to stop a flow of the solder.

It should be noted that, compared with when internal wiring13is used as the heat dissipation path, when surface layer wiring12is used, the area for routing the wiring is smaller due to the presence of mounted components, and the width of a conductor pattern tends to be short. As long as a sufficient width of the conductor pattern is ensured by using internal wiring13as the heat dissipation path, compared with using the surface layer wiring12, it is preferable to use internal wiring13as the heat dissipation path rather than using surface layer wiring12. On the other hand, when there are fewer mounted components and the area for wiring is ensured, it is preferable to use surface layer wiring12that can connect the heat dissipation path with the shortest distance.

As described in the present embodiment, the wiring may include surface layer wiring12disposed on a surface of substrate1.

A module106shown inFIG.9can be contemplated as a modification of the present embodiment. Module106differs from module105in that it employs double-sided mounting.

Fifth Embodiment

Referring toFIG.10andFIG.11, a module in a fifth embodiment based on the present disclosure will be described. A module107in the present embodiment is shown inFIG.10. A cross-sectional view as viewed from the arrow XI-XI inFIG.10is shown inFIG.11.

In module107, surface layer wiring12is used as the heat dissipation path. In module107, heat dissipation portion5iis used. Heat dissipation portion5iis disposed on the lower side of shield film8. Heat dissipation portion5ioverlaps with a part of the lower surface of shield film8. The lower surface of heat dissipation portion5iis at a position lower than the upper surface of component3b.

The present embodiment also achieves an effect similar to that of module103described in the third embodiment. Since heat dissipation portion5iis disposed so as not to overlap with component3b, the height of the entire module107can be reduced.

Sixth Embodiment

Referring toFIG.12andFIG.13, a module in a sixth embodiment based on the present disclosure will be described. A module108in the present embodiment is shown inFIG.12. A cross-sectional view as viewed from the arrow XIII-XIII inFIG.12is shown inFIG.13.

Module108includes a heat dissipation portion5k. Heat dissipation portion5kdoes not have a constant thickness, and the thickness varies with sections. Heat dissipation portion5kis thick immediately above first component31. In this section, the lower surface of heat dissipation portion5kis close to the upper surface of first component31. Component3ahas a height more than first component31. Heat dissipation portion5kis thin immediately above component3a. The upper surface of heat dissipation portion5kis at a constant height. The upper surface of heat dissipation portion5kis in contact with the lower surface of shield film8.

The present embodiment also achieves a similar effect. In module108, not only heat conducting member7electrically and thermally connected to ground terminal10of first component31but also heat conducting member7not connected to first component31are disposed. Heat conducting member7on the right side inFIG.12applies to this. With such a configuration, a certain effect can be achieved because even the heat conducting member7that is not connected to first component31contributes to the transmission of the heat emitted from first component31to the periphery to heat dissipation portion5k, to some degree.

(Variations of Heat Dissipation Portion and Heat Conducting Member)

Variations of the heat dissipation portion and the heat conducting member can be contemplated. As shown inFIG.14, a heat dissipation portion7amay be provided, which extends to the side along the upper surface of first sealing resin6aon the lower side of shield film8. Here, heat dissipation portion7aconnects to heat conducting member7. Heat conducting member7is a pillar-shaped conductor. Heat dissipation portion7ais in contact with the lower surface of shield film8. In the example shown inFIG.14, the heat dissipation portion is continuous to the upper end of the pillar-shaped conductor.

As shown inFIG.15, heat dissipation portion7bmay extend in the shape of an umbrella along the upper surface of first sealing resin6aon the lower side of shield film8. The pillar-shaped conductor as heat conducting member7connects to heat dissipation portion7bfrom a certain section on the underside. In this way, it is preferable that the heat dissipation portion includes a portion extending in a direction parallel to first main surface1a.

The presence of shield film8is not essential, and as shown inFIG.16andFIG.17, shield film8may be absent.

As shown inFIG.18, a heat dissipation portion7cmay be provided. Heat dissipation portion7chas a shape covering the upper surface of first sealing resin6a. Heat dissipation portion7chas the shape of a flat dome.

As shown inFIG.19, a heat dissipation portion7dmay be provided. Heat dissipation portion7dhas a tapered shape having a wider upper portion.

In the examples shown inFIG.14toFIG.19, the heat dissipation portion is integrated with a pillar-shaped conductor as the heat conducting member7. The heat dissipation portion is formed of the same material as heat conducting member7. In this way, it is preferable that the heat dissipation portion is integrated with the pillar-shaped conductor.

(Heat Dissipation Fin)

As a modification of the module, a configuration such as a module109shown inFIG.20can be contemplated. In module109, heat dissipation portion5rests on the upper side of shield film8. Heat dissipation portion5has heat dissipation fins18. The internal structure of module109may be similar to that of module101described in the first embodiment. The heat dissipation member preferably includes heat dissipation fins18. With such a configuration, the heat can be released to the surrounding air through heat dissipation fins18, thereby efficiently dissipating the heat.

Some of the foregoing embodiments may be employed in combination. The embodiments disclosed here are intended to be illustrative only and not limitative in all respects. The scope of the present disclosure is shown in the claims, and it is intended that all modifications that come within the meaning and range of equivalence to the claims are embraced here.1substrate,1afirst main surface,1bsecond main surface,2insulating layer,3a,3bcomponent,5,5i,5j,5kheat dissipation portion,6afirst sealing resin,6bsecond sealing resin,7heat conducting member,7a,7b,7cheat dissipation portion,8shield film,10ground terminal,11adhesive,12surface layer wiring,13internal wiring,14conductor pattern,15external connection terminal,16conductor via,17pillar-shaped conductor,18heat dissipation fin,31first component,31acircuit surface, 32 second component,101,102,103,104,105,106,107,108,109module.