Patent Publication Number: US-2022238455-A1

Title: Module

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This is a continuation of International Application No. PCT/JP2020/039690 filed on Oct. 22, 2020 which claims priority from Japanese Patent Application No. 2019-202480 filed on Nov. 7, 2019. The contents of these applications are incorporated herein by reference in their entireties. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     Field of the Disclosure 
     The present disclosure relates to a module. 
     Description of the Related Art 
     International Patent Publication No. 2018/101384 (PTL 1) discloses a high frequency module having a configuration in which a plurality of components is mounted on an upper surface and a lower surface of a wiring substrate. In this high frequency module, a first sealing resin layer is provided to cover the upper surface of the wiring substrate, and a second sealing resin layer is provided to cover the lower surface the wiring substrate. A shield film is provided to cover a side surface of the second sealing resin layer, a side surface of the wiring substrate, and a side surface and an upper surface of the first sealing resin layer. Further, a shield electrode is disposed to cover a part of a lower surface of the second sealing resin layer. A shield wall is formed to surround one of the plurality of components mounted on the lower surface of the wiring substrate, and a lower end of the shield wall is connected to the shield electrode. 
     PTL 1: International Patent Publication No. 2018/101384 
     BRIEF SUMMARY OF THE DISCLOSURE 
     In the high frequency module disclosed in PTL 1, ground connection to the film-shaped shield electrode disposed to cover a part of the lower surface of the second sealing resin layer is performed from the wiring substrate through the shield wall. A conductive paste is used as a material of the shield wall and, in this case, a resistance value in a ground connection path increases. Thus, there is a possibility that a sufficient ground potential is not obtained. 
     In addition, considering that the module is mounted on a mother substrate or the like, it is preferable that ground connection can be performed from a counterpart ground terminal to be mounted, but it is difficult to perform ground connection with a shield film having a film shape. 
     Therefore, an object of the present disclosure is to provide a module that allows ground connection to be sufficiently performed. 
     In order to achieve the above object, a module of the present disclosure includes a substrate having a first surface, a first component and a second component that are mounted on the first surface, a first conductive material mounted between the first component and the second component on the first surface, a first sealing resin provided on the first surface to cover the first component, the second component, and the first conductive material, and a first shield film that covers a surface, of the first sealing resin, farther from the substrate. The first sealing resin has a recess to expose at least a part of the first conductive material. The first shield film extends along an inner surface of the recess and is, thereby, electrically connected to the first conductive material. Furthermore, the first shield film is provided with an opening in the recess. A metal bump is disposed inside the recess. The metal bump is electrically connected to the first conductive material through the opening. 
     In the present disclosure, the metal bump is disposed inside the recess provided in the first sealing resin, and when the module is mounted on a mother substrate or the like, the metal bump can secure electrical connection. Therefore, the ground connection of the module can be sufficiently performed. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a perspective view of a module according to a first embodiment of the present disclosure. 
         FIG. 2  is a bottom view of the module according to the first embodiment of the present disclosure. 
         FIG. 3  is a sectional view taken along line III-III in  FIG. 2  as viewed in a direction of arrows. 
         FIG. 4  is a partially enlarged sectional view of a vicinity of a first conductive material of the module according to the first embodiment of the present disclosure. 
         FIG. 5  is a partially enlarged sectional view of a vicinity of a first conductive material of a modification of the module according to the first embodiment of the present disclosure. 
         FIG. 6  is a sectional view of a module according to a second embodiment of the present disclosure. 
         FIG. 7  is a sectional view of a module according to a third embodiment of the present disclosure. 
         FIG. 8  is a sectional view of a module according to a fourth embodiment of the present disclosure. 
         FIG. 9  is a partially enlarged sectional view of a vicinity of a first conductive material of the module according to the fourth embodiment of the present disclosure. 
         FIG. 10  is a sectional view of a module according to a fifth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     The dimensional ratios illustrated in the drawings do not necessarily represent the actual dimensional ratios, and the dimensional ratios may be exaggerated for convenience of description. In the following description, when referring to a generic or specific concept, it does not necessarily mean absolutely generic or specific, but may mean relatively generic or specific in the illustrated posture. 
     First Embodiment 
     With reference to  FIGS. 1 to 4 , a module according to a first embodiment of the present disclosure will be described.  FIG. 1  illustrates a module  101  according to the present embodiment as viewed obliquely from below. Module  101  has a substantially rectangular parallelepiped shape as a whole. Module  101  includes a shield film  70  formed to cover a side surface. Module  101  includes a first shield film  71  formed to cover a part of a lower surface.  FIG. 2  illustrates a bottom view of module  101 . A first sealing resin  61  is exposed at a part of the lower surface not covered with first shield film  71 . A plurality of connection terminals  9  are provided at a part where first sealing resin  61  is exposed. The plurality of connection terminals  9  are aligned near an outer edge of the lower surface of module  101 . Shield film  70  may have a multilayer structure. First shield film  71  may also have a multilayer structure. For example, first shield film  71  may be formed by an adhesion layer formed on a surface of first sealing resin  61  or the like, a conductive layer laminated on the adhesion layer, and a protective layer laminated on the conductive layer. The adhesion layer is provided to increase a degree of adhesion between the conductive layer and first sealing resin  61 , and can be formed of, for example, a metal such as Ti, Cr, or SUS. The conductive layer is a layer having a substantial shielding function of first shield film  71 , and can be formed of, for example, a metal such as Cu, Ag, or Al. The protective layer is provided to prevent corrosion or the like of the conductive layer, and can be formed of, for example, a metal such as Ti, Cr, or SUS.  FIG. 3  is a sectional view taken along line III-III in  FIG. 2  as viewed in line III-III. 
     Module  101  includes a substrate  1  having a first surface  1   a , a component  3   a  as a first component and a component  3   b  as a second component mounted on first surface  1   a , a first conductive material  51  mounted between the first component and the second component on the first surface  1   a , first sealing resin  61  provided on the first surface to cover the first component, the second component, and the first conductive material, and first shield film  71  that covers a surface, of first sealing resin  61 , farther from substrate  1 . A ground conductor pattern  7  is disposed inside substrate  1 . First conductive material  51  is electrically connected to ground conductor pattern  7 . Further, first conductive material  51  has a first joint surface  51   a  having higher solder wettability than first shield film  71 , on the surface farther from substrate  1 . First sealing resin  61  has a recess  10  to expose at least a part of first conductive material  51 . An inner surface of recess  10  is tapered. In recess  10 , an opening  13  is provided in first shield film  71 . An antenna electrode  4  is disposed on first surface  1   a . Antenna electrode  4  may be an aggregate of a plurality of separated electrodes, or may be a connected and integrated electrode. A position, shape, size, and arrangement of antenna electrode  4  illustrated in  FIG. 3  are merely examples, and are not limited to those illustrated here. 
       FIG. 4  is an enlarged view of a vicinity of first conductive material  51 . In  FIG. 4 , antenna electrode  4  is not illustrated. First shield film  71  is electrically connected to first conductive material  51  by extending along the inner surface of recess  10 . A metal bump is disposed inside recess  10 . The metal bump is electrically connected to first conductive material  51  through opening  13 . In the example shown here, the metal bump is a solder bump  12 . That is, solder bump  12  is disposed inside recess  10 . Solder bump  12  is electrically connected to first joint surface  51   a . Solder bump  12  protrudes from the surface, of first sealing resin  61 , farther from substrate  1 . First shield film  71  includes a part  71   a  covering a slope of recess  10  and a part  71   b  covering a bottom surface of recess  10 . Part  71   b  is provided with an opening  13 . Solder bump  12  is electrically connected to first joint surface  51   a  through opening  13 . Opening  13  can be formed, for example, by performing laser processing on first shield film  71 . Here, in a case where the shield film has a multilayer structure, it is desirable that the protective layer of first shield film  71  has low solder wettability. As a result, in part  71   a  covering the slope of recess  10  of first shield film  71 , solder bump  12  does not wet or spread over, a bump shape is maintained, and electrical connection with a mother substrate can be reliably achieved. 
     In the present embodiment, solder bump  12  is disposed inside recess  10  provided in first sealing resin  61 , and opening  13  provided in the shield film secures electric connection between the solder bump and first conductive material  51  constituting an inter-component shield. Thus, when module  101  is mounted on a mother substrate or the like, solder bump  12  can secure electrical connection. Therefore, ground connection can be sufficiently performed to the shield film (first shield film  71  corresponds to the “shield film” herein) formed to cover the lower surface of module  101 . 
     In a configuration in which a shield wall is formed to have a shielding function as in the related art, a groove serving as the shield wall is formed using a laser at a time of forming the shield wall. However, there is also a problem that the substrate is damaged by a laser light. In the present embodiment, the conductive material is used instead of the shield wall, and it is thus not necessary to process the substrate using a laser. Therefore, the substrate is not damaged. 
     As illustrated in the present embodiment, the first conductive material has the first joint surface having higher solder wettability than the first shield film on the surface farther from the substrate, and the metal bump is preferably a solder bump. The configuration adopted herein can achieve electrical connection with the mother substrate more reliably. 
     First conductive material  51  preferably includes a first metal block  41 . In the example illustrated in  FIG. 4 , first conductive material  51  as a whole is first metal block  41 . The configuration adopted herein can achieve first conductive material  51  with a simple configuration. First metal block  41  is preferably a copper block. The configuration adopted herein can suppress electric resistance of first conductive material  51  to be low. First metal block  41  may be a block formed of a metal other than copper. 
     Instead of the configuration illustrated in  FIG. 4 , a solder wet layer  8  may be provided as illustrated in  FIG. 5 . In the example shown in  FIG. 5 , first conductive material  51  includes first metal block  41  and solder wet layer  8 . First conductive material  51  includes first metal block  41 , and preferably includes solder wet layer  8  having higher solder wettability than a material of first metal block  41 , so that first conductive material  51  is exposed as first joint surface  51   a . The configuration adopted herein can increase a degree of freedom in selecting the material of first metal block  41 . Solder wet layer  8  may be, for example, Au/Ni plating. When first metal block  41  is, for example, a copper block, solder wet layer  8  can be formed by applying Ni plating to an upper surface of the copper block and further applying Au plating to the upper surface. 
     As described in the present embodiment, first surface  1   a  is preferably a mounting surface of module  101 . The configuration adopted herein can reliably ensure the electrical connection at a time of mounting the module by the metal bump disposed inside the recess. 
     Second Embodiment 
     With reference to  FIG. 6 , a module according to a second embodiment of the present disclosure will be described.  FIG. 6  is a sectional view of a module  102  according to the present embodiment. Module  102  has a so-called double-sided mounting structure. In module  102 , substrate  1  has a second surface  1   b  as a surface opposite to first surface  1   a . Electronic components  3   c  and  3   d  are mounted on second surface  1   b . Second surface  1   b  and the electronic components are covered with a second sealing resin  62 . The structure on first surface  1   a  of substrate  1  of module  102  is similar to that of module  101  described in the first embodiment. 
     In the present embodiment, since solder bump  12  is disposed inside recess  10  provided in first sealing resin  61 , such an effect as described in the first embodiment can be obtained. Furthermore, in the present embodiment, the double-sided mounting structure allows more components to be mounted on one substrate  1 . 
     Third Embodiment 
     With reference to  FIG. 7 , a module according to a third embodiment of the present disclosure will be described.  FIG. 7  is a sectional view of a module  103  according to the present embodiment. 
     In module  103 , second conductive material  52  is mounted on second surface  1   b . Second sealing resin  62  has a thickness more than a height of second conductive material  52 . A surface, of second sealing resin  62 , farther from substrate  1  is covered with second shield film  72 . Second conductive material  52  is disposed between the plurality of electronic components  3   c  and  3   d  mounted on second surface  1   b . Second conductive material  52  includes a second metal block. The second metal block is, for example, a copper block. Second sealing resin  62  has a recess  11  at a position corresponding to second conductive material  52 . Second shield film  72  extends along an inner surface of recess  11 . Second shield film  72  is electrically connected to second conductive material  52  at a bottom of recess  11 . 
     In the present embodiment, such an effect as described in the second embodiment can be obtained. Furthermore, in the present embodiment, since second conductive material  52  is mounted on second surface  1   b  of substrate  1  to achieve a compartment shield, the components mounted on second surface  1   b  can be operated more reliably. 
     Fourth Embodiment 
     With reference to  FIGS. 8 and 9 , a module according to a fourth embodiment of the present disclosure will be described.  FIG. 8  is a sectional view of a module  104  according to the present embodiment. 
     In module  104 , a first conductive material  51   i  is mounted on first surface  1   a  of substrate  1 . First conductive material  51   i  is electrically connected to ground conductor pattern  7 . First conductive material  51   i  is an electronic component  3   f  including a ground terminal  3   f   1 .  FIG. 9  is an enlarged view of a vicinity of first conductive material  51   i . First conductive material  51   i  has a first joint surface  51   ia . First joint surface  51   ia  is a part of ground terminal  3   fl . Ground terminal  3   f   1  is preferably disposed across a surface of electronic component  3   f  facing substrate  1  and a surface facing an opposite side of substrate  1 . 
     In the present embodiment, electronic component  3   f  as one of the mounted components is used as first conductive material  51   i . In the present embodiment, since it is not necessary to mount a new metal block or the like, space on a surface of substrate  1  can be saved. 
     Fifth Embodiment 
     With reference to  FIG. 10 , a module according to a fifth embodiment of the present disclosure will be described.  FIG. 10  is a sectional view of a module  105  according to the present embodiment. In module  105 , first conductive material  51  and first conductive material  51   i  are both mounted on first surface  1   a  of substrate  1 . First conductive material  51  has first joint surface  51   a . First conductive material  51  includes solder wet layer  8 . First joint surface  51   a  is a surface of solder wet layer  8 . First conductive material  51   i  has a first joint surface  51   ia.    
     Recesses  10  are formed separately and respectively corresponding to first conductive material  51  and first conductive material  51   i . Solder bump  12  is disposed inside each of recesses  10 . That is, one solder bump  12  is electrically connected to first conductive material  51 , and another solder bump  12  is electrically connected to first conductive material  51   i.    
     A ground conductor pattern  7  is disposed inside substrate  1 . Ground conductor pattern  7  and first conductor material  51  are electrically connected at first joint surface  51   a . Ground conductor pattern  7  and first conductor material  51   i  are electrically connected at first joint surface  51   ia . Ground conductor pattern  7  and second shield film  72  are electrically connected to each other at the bottom of recess  11 . 
     In the present embodiment, when module  105  is mounted on a mother substrate or the like, solder bump  12  secures electrical connection at a plurality of locations. Therefore, ground connection can be sufficiently performed to the shield film formed to cover the lower surface of module  105 . 
     Note that a plurality of the above embodiments may be appropriately combined and adopted. 
     It should be understood that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, and includes meanings equivalent to the claims and all modifications within the scope. 
       1 : substrate,  1   a : first surface,  1   b : second surface,  3   a ,  3   b : component,  3   c ,  3   d,    3   f : electronic component,  3   f   1 : ground terminal,  4 : antenna electrode,  7 : ground conductor pattern,  8 : solder wet layer,  9 : connection terminal,  10 : opening (of first sealing resin),  11 : recess,  12 : solder bump,  13 : opening (of first shield film),  41 : first metal block,  51 ,  51   i : first conductive material,  51   a ,  51   ia : first joint surface,  52 : second conductive material,  61 : first sealing resin,  62 : second sealing resin,  70 : shield film,  71 : first shield film,  71   a : part (covering slope),  71   b : part (covering bottom surface),  72 : second shield film, and  101 ,  102 ,  103 ,  104 ,  105 : module.