MODULE

It is to provide to a module and a method of manufacturing the module in which parasitic capacitance generated between two shield films is reduced without hindering reduction in height of a module. The module includes, a substrate, a component mounted on an upper surface that is one main surface of the substrate, a first shield film provided on an upper surface of the component, sealing resin provided on an upper surface of the substrate so as to seal the component, a second shield film provided on an upper surface or an upper side of the sealing resin, and a low dielectric member arranged between the first shield film and the second shield film and having a dielectric constant lower than a dielectric constant of the sealing resin.

BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

The present disclosure relates to a module in which an electronic component is mounted on a substrate.

Description of the Related Art

Conventionally, as this type of module, for example, a module described in Patent Document 1 (U.S. Pat. No. 10217711) is known. Patent Document 1 discloses a module in which a shielded component covered with a shield film that shields electromagnetic waves and other components are mounted on one main surface of a substrate, and all components are sealed with sealing resin.

BRIEF SUMMARY OF THE DISCLOSURE

Based on the configuration of Patent Document 1, the present inventors have developed a module including an additional shield film that covers the sealing resin in order to prevent an external electromagnetic wave from affecting the other components. In such a module, in a case where potential of a ground point is different between an existing shield film and an additional shield film, parasitic capacitance is generated between the two shield films. The parasitic capacitance may cause malfunction of the module. The parasitic capacitance may be reduced as a distance between the two shield films is increased, but reduction in height of the module is hindered. From this point of view, there is still room for improvement in the configuration of the module.

Therefore, a possible benefit of the present disclosure is to solve the above problem, and to provide a module in which parasitic capacitance generated between two shield films is reduced without hindering reduction in height of the module.

To achieve the possible benefit, a module according to an aspect of the present disclosure includes:a substrate;a component mounted on an upper surface that is one main surface of the substrate;a first shield film provided on an upper surface of the component;sealing resin provided on an upper surface of the substrate so as to seal the component;a second shield film provided on an upper surface or an upper side of the sealing resin; anda low dielectric member arranged between the first shield film and the second shield film and having a dielectric constant lower than a dielectric constant of the sealing resin.

Further, a method of manufacturing a module according to one aspect of the present disclosure includes the steps of:preparing a substrate on which a component having a first shield film is mounted on an upper surface which is one main surface;providing sealing resin on an upper surface of the substrate to seal the component;removing a part of the sealing resin from an upper surface of the sealing resin toward the first shield film;providing a low dielectric member having a dielectric constant lower than a dielectric constant of the sealing resin in a space formed by removing a part of the sealing resin; andforming a second shield film on an upper side or an upper surface of the low dielectric member and another part of the sealing resin.

According to the present disclosure, it is possible to reduce parasitic capacitance generated between two shield films without hindering reduction in height of a module.

DETAILED DESCRIPTION OF THE DISCLOSURE

According to an aspect of the present disclosure, there is provided a module including:a substrate;a component mounted on an upper surface that is one main surface of the substrate;a first shield film provided on an upper surface of the component;sealing resin provided on an upper surface of the substrate so as to seal the component;a second shield film provided on an upper surface or an upper side of the sealing resin; anda low dielectric member arranged between the first shield film and the second shield film and having a dielectric constant lower than a dielectric constant of the sealing resin.

According to a second aspect of the present disclosure, there is provided the module according to the first aspect, in which

the low dielectric member is formed in a tapered shape such that an area of an upper surface on the second shield film side is larger than an area of a lower surface on the first shield film side.

According to a third aspect of the present disclosure, there is provided the module according to the first or second aspect, in whichthe first shield film is further provided on a side surface of the component, andsurface roughness of the first shield film provided on an upper surface of the component is greater than surface roughness of the first shield film provided on a side surface of the component.

According to a fourth aspect of the present disclosure, there is provided the module according to any one of the first to third aspects, in which

at least one of the first shield film and the second shield film is in contact with the low dielectric member.

According to a fifth aspect of the present disclosure, there is provided the module according to the fourth aspect, in which

the second shield film in contact with the low dielectric member is formed of metal that is passive metal and transition metal or an alloy containing the metal, and a surface of the low dielectric member in contact with the metal or the alloy containing the metal has a nitrogen functional group.

According to a sixth aspect of the present disclosure, there is provided a method of manufacturing a module, the method including the steps of:preparing a substrate on which a component having a first shield film is mounted on an upper surface which is one main surface;providing sealing resin on an upper surface of the substrate to seal the component;removing a part of the sealing resin from an upper surface of the sealing resin toward the first shield film provided on an upper surface of the component;providing a low dielectric member having a dielectric constant lower than a dielectric constant of the sealing resin in a space formed by removing a part of the sealing resin; andforming a second shield film on an upper side or an upper surface of the low dielectric member and another part of the sealing resin.

According to a seventh aspect of the present disclosure, there is provided a method of manufacturing a module, the method including the steps of:preparing a substrate on which a component having a first shield film is mounted on an upper surface which is one main surface;providing a dielectric member on an upper surface of the first shield film provided on an upper surface of the component;providing sealing resin on an upper surface of the substrate so as to seal the component and the dielectric member; andforming a second shield film on an upper surface of the sealing resin and an upper side of the dielectric member, whereinthe dielectric member is a low dielectric member having a dielectric constant lower than a dielectric constant of the sealing resin.

According to an eighth aspect of the present disclosure, there is provided the method of manufacturing a module according to the seventh aspect, the method further including the step of:exposing an upper surface of the dielectric member by removing a part of the sealing resin after the step of providing the sealing resin, whereinthe step of forming the second shield film includes forming the second shield film on the exposed upper surface of the dielectric member and an upper surface of another part of the sealing resin.

Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the embodiment below. Further, in the drawings, substantially the same members are denoted by the same reference numerals, and omitted from description.

Further, hereinafter, terms indicating directions such as “upper surface”, “lower surface”, and “side surface” are used for convenience of description. However, these terms do not mean to limit a use state or the like of the module according to the present disclosure.

Embodiment

A module according to an embodiment of the present disclosure will be described with reference toFIGS.1and2.FIG.1is a top view schematically illustrating a module according to the embodiment of the present disclosure.FIG.2is a cross-sectional view of the module ofFIG.1taken along line A1-A1.

A module1according to the present embodiment includes a substrate2and components31and32mounted on an upper surface2awhich is one main surface of the substrate2. An internal shield film5, which is an example of a first shield film, is provided on an upper surface31aof the component31. In the present embodiment, the internal shield film5is also provided on a side surface31bof the component31. Surface roughness of the internal shield film5provided on the upper surface31aof the component31is greater than surface roughness of the internal shield film5provided on a side surface of the component31. The surface roughness in the present embodiment is measured as an arithmetic mean roughness (Ra) in accordance with JIS (Japanese Industrial Standards) B0601 (2013) (corresponding International Standard: ISO 4287:1997). For measurement of the surface roughness, for example, a stylus type surface roughness measuring instrument or a non-contact type surface roughness measuring instrument can be used. The stylus type surface roughness measuring instrument scans a surface of an object to be measured with a needle, and measures an uneven shape. The non-contact type surface roughness measuring instrument irradiates a surface of an object to be measured with laser or light to perform scanning, and measures an uneven shape. As the non-contact type surface roughness measuring instrument, for example, a laser type VK-120 (model number) manufactured by KEYENCE CORPORATION or an optical type VR-3000 (model number) manufactured by KEYENCE CORPORATION can be used.

Further, the module1includes sealing resin4provided on the upper surface2aof the substrate2so as to seal the components31and32. An external shield film7, which is an example of a second shield film, is provided on an upper surface4aof the sealing resin4. A low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4is provided between the internal shield film5and the external shield film7. Hereinafter, a dielectric constant in the present embodiment is measured as a relative dielectric constant (εr) in accordance with JIS (Japanese Industrial Standards) C2138 (2007) (corresponding International Standard: IEC 60250:1969). An upper surface6aof the low dielectric member6and the external shield film7face each other. A lower surface6cof the low dielectric member6and the internal shield film5face each other. A side surface6bof the low dielectric member6is covered with the sealing resin4.

As illustrated inFIG.2, the substrate2has the upper surface2aas one main surface, a lower surface2cas the other main surface, and a side surface2bconnecting outer peripheral portions of the upper surface2aand the lower surface2c. The substrate2may be either a single-layer substrate or a multilayer substrate. The substrate2is made from, for example, glass epoxy resin, low-temperature co-fired ceramic, or high-temperature co-fired ceramic.

A mounting electrode (not illustrated) is provided on the upper surface2aof the substrate2. The components31and32are mounted on the mounting electrode via a solder bump21. The components31and32are, for example, resistors, capacitors, inductors, filters, or semiconductor elements such as integrated circuits or power amplifiers. The filter is a surface acoustic wave filter, a bulk acoustic wave filter, a ceramic LC filter, or the like. In the present embodiment, a plurality of types of the components32are provided.

The mounting electrode is made from, for example, a conductive material of copper (Cu), silver (Ag), aluminum (Al), or a compound of these types of metal. The mounting electrode may be plated with nickel (Ni)/gold (Au).

The upper surface31aand the side surface31bof the component31are covered with the internal shield film5. The internal shield film5is formed of metal which is passive metal and transition metal or an alloy containing the metal, and shields an electromagnetic wave.

The internal shield film5is formed by, for example, a sputtering method or a vapor deposition method. A film thickness of the internal shield film5is, for example, 2 µm or more and less than 5 µm.

The internal shield film5shields an electromagnetic wave radiated from the outside or from the component32. For this reason, the component31is hardly affected by an electromagnetic wave radiated from the outside or from the component32. Therefore, malfunction of the component31may be prevented. Further, the internal shield film5also shields an electromagnetic wave radiated by the component31. For this reason, the component32is hardly affected by an electromagnetic wave radiated by the component31. Therefore, malfunction of the component32may also be prevented.

The components31and32are sealed with the sealing resin4provided on the upper surface2aof the substrate2. The sealing resin4has an abutting surface4cabutting on the upper surface2aof the substrate2, the upper surface4afacing the abutting surface4c, and a side surface4bconnecting the upper surface4aand an outer peripheral portion of the abutting surface.

The sealing resin4is made from, for example, epoxy resin. Further, the sealing resin4may contain, for example, a silica filler or an alumina filler. A value of a dielectric constant of the sealing resin4is 3.5 or more and 4.0 or less.

The low dielectric member6is made from, for example, polytetrafluoroethylene (PTFE), thermosetting low dielectric resin, or a liquid crystal polymer (LCP). The low dielectric member6has a dielectric constant lower than a dielectric constant of the sealing resin4. For example, a dielectric constant of PTFE is 2.1. A dielectric constant of “SLK series” manufactured by Shin-Etsu Chemical Co., Ltd. as an example of thermosetting low dielectric resin is 2.3. A dielectric constant of an LCP is 3.0. Note that the low dielectric member6may contain a silica filler or a filler of alumina in order to secure strength of the member itself. In order to obtain a low dielectric constant, a content of the filler is desirably smaller than that of the sealing resin4.

The external shield film7is formed by, for example, a sputtering method or a vapor deposition method. A film thickness of the external shield film7may be, for example, 2 µm or more and less than 5 µm.

The external shield film7shields an electromagnetic wave radiated from the outside. For this reason, the components31and32are less likely to be affected by an electromagnetic wave radiated from the outside. Therefore, malfunction of the components31and32is prevented. Further, the external shield film7also shields an electromagnetic wave radiated by the components31and32. For this reason, the components31and32are less likely to affect the outside with an electromagnetic wave. Therefore, for example, when the module1is mounted on a mother board, malfunction of other electronic components mounted on the mother board may also be prevented.

The internal shield film5and the external shield film7may have a multilayer structure. For example, the external shield film7includes an adhesive film stacked on the low dielectric member6, a conductive film stacked on the adhesive film, and a protective film stacked on the conductive film. The adhesion film is provided to enhance adhesion between the low dielectric member6and the conductive film, and is made from, for example, stainless steel (SUS) . The conductive film has a function of shielding an electromagnetic wave, and is made from, for example, copper (Cu), silver (Ag), or aluminum (Al). The protective film is provided to protect the conductive film from corrosion, damage, or the like, and is made from, for example, stainless steel (SUS). The internal shield film5may have a similar configuration.

Further, in the present embodiment, the external shield film7is formed of metal which is passive metal and transition metal or an alloy containing the metal. The “passive metal” mentioned here means metal that easily forms a passive state. That is, a material of an adhesion layer and oxygen are bonded for oxidation to form a passive state. Examples of the metal which is passive metal and transition metal include titanium (Ti), chromium (Cr), nickel (Ni), and molybdenum (Mo). Further, examples of the alloy containing the metal include stainless steel (SUS).

As illustrated inFIG.3, for example, a surface of the low dielectric member6in contact with the external shield film7can contain a nitrogen functional group. The nitrogen functional group is as illustrated inFIG.4. InFIG.3, the external shield film7includes an adhesive film70a, a conductive film70b, and a protective film70c. The adhesive film70ais in contact with the low dielectric member6. A nitrogen functional group is formed near a boundary surface between the adhesive film70aand the low dielectric member6. The mark “X” in the diagram means an atom of metal which is passive metal and transition metal. The mark “0” in the diagram means an oxygen atom. Note that “0” bonded to “X” is present in a filler contained in the low dielectric member6.

In the present embodiment, an adhesion layer is formed of metal which is passive metal and transition metal or an alloy containing the metal. By forming a nitrogen functional group on a surface of the low dielectric member6before forming the adhesion layer, transition metal of the adhesion layer can be brought into close contact with the nitrogen functional group by a coordinate bond. As a method of forming a nitrogen functional group on a surface of the low dielectric member6, for example, there is a method of irradiating with nitrogen ions. By irradiating with nitrogen ions, a surface of the low dielectric member6is modified and a nitrogen functional group is generated. The adhesion layer is also in close contact with a filler contained in the low dielectric member6due to property of passive metal. By irradiating with nitrogen ions, a surface of the low dielectric member6is etched. As a result, a filler contained in the low dielectric member6is exposed on the surface of the low dielectric member6after being irradiated with nitrogen ions. Since oxygen that is easily bonded to passive metal of the adhesion layer exists in the filler, passive metal of the adhesion layer is bonded to oxygen of the exposed filler, and the adhesion layer is also in close contact with the filler. When irradiation with nitrogen ions is performed, for example, it is desirable to increase a nitrogen introduction amount, lower ion acceleration voltage, and set a nitrogen functional group generation rate to be higher than an etching rate.

In a direction orthogonal to the upper surface2aof the substrate2, the internal shield film5and the external shield film7are arranged at close intervals of, for example, 100 µm. Parasitic capacitance is generated between these two shield films.

Assuming that a dielectric constant of a member provided between the two shield films is ε, a distance between the two shield films is d, and an area of an upper surface of the internal shield film5is S, a value C of the parasitic capacitance can be expressed by C = εS / d [F]. That is, the parasitic capacitance generated between the two shield films can be reduced by reducing a value of the dielectric constant of the member provided between the two shield films or widening a distance between the two shield films.

First Embodiment

Next, a method of manufacturing a module according to an embodiment of the present disclosure will be described.FIGS.5to9are cross-sectional views schematically illustrating each step in the first embodiment which is an example of the method of manufacturing a module according to the embodiment of the present disclosure.

First, as illustrated inFIG.5, the substrate2on which the component31having the internal shield film5is mounted on the upper surface2ais prepared. The internal shield film5is provided on the upper surface31aof the component31. Further, the internal shield film5is also provided on the side surface31bof the component31. The component32is also mounted on the upper surface2aof the substrate2. The components31and32are mounted on the mounting electrode provided on the upper surface2aof the substrate2via the solder bump21.

Next, as illustrated inFIG.6, the sealing resin4is provided on the upper surface2aof the substrate2so as to seal the components31and32. At this time, the sealing resin4seals the components31and32and the internal shield film5.

Next, as illustrated inFIG.7, a part of the sealing resin4is removed to form a space. Specifically, a part of the sealing resin4sealing the upper side of the internal shield film5is removed. A part of the sealing resin4is removed by, for example, a laser so as to be dug from the upper surface4aof a part of the sealing resin4sealing the upper side of the internal shield film5toward an upper surface of the internal shield film5provided on the upper surface31aof the component31.

When the sealing resin4sealing the upper side of the internal shield film5is removed by a laser, a material forming the internal shield film5is less likely to transmit the laser. That is, even if the internal shield film5is irradiated with a laser, the component31is less likely to be damaged, so that the sealing resin4on the upper side of the internal shield film5can be reliably removed.

When a part of the sealing resin4sealing the upper side of the internal shield film5is removed by a laser, as illustrated inFIG.7, a recess4dwhich is a space formed by the sealing resin4and the internal shield film5is formed. The recess4dthat is formed expands in a tapered shape in a manner that an area of an opening portion of the recess4dis larger than an area of an upper surface5aof the internal shield film5. At this time, since the sealing resin4is removed deeper than the upper surface5aoutside the upper surface5aof the internal shield film5, a part of a side surface5bof the internal shield film5may be exposed from the sealing resin4.

Next, as illustrated inFIG.8, the low dielectric member6is formed in the recess4d. In other words, the low dielectric member6is formed in a space formed by removing a part of the sealing resin4. That is, the low dielectric member6is formed in a tapered shape such that an area of the upper surface6aon the external shield film7side is larger than an area of the lower surface6con the internal shield film5side.

Next, as illustrated inFIG.9, the external shield film7is formed on the upper surface4aof another part of the sealing resin4and the upper surface6aof the low dielectric member6. Further, the external shield film7is formed on the side surface4bof the sealing resin4and the side surface2bof the substrate2. At this time, the low dielectric member6is arranged between the internal shield film5and the external shield film7in a direction orthogonal to the upper surface2aof the substrate2. In this manner, the module1illustrated inFIG.9can be obtained.

Note that, on order to improve adhesion when the internal shield film5and the low dielectric member6are in contact with each other, surface treatment may be performed on a surface of the internal shield film5or a surface of the low dielectric member6.

For example, plasma may be applied to the internal shield film5while argon gas is allowed to flow, so that the residue of the sealing resin4is removed and the upper surface5aof the internal shield film5is roughened. By applying plasma to the internal shield film5while allowing argon gas to flow, the upper surface5aside of the internal shield film5is roughened more than the side surface5b, and adhesion between the upper surface5aof the internal shield film5and the low dielectric member6can be improved.

Second Embodiment

Next, another example of the method of manufacturing a module according to the present disclosure will be described.FIGS.5and10to12are cross-sectional views schematically illustrating each step in a second embodiment which is an example of the method of manufacturing a module according to the embodiment of the present disclosure.

First, a step of preparing the substrate2on which the component31having the internal shield film5is mounted on the upper surface2ais the same as that in the first embodiment as illustrated inFIG.5, and thus is omitted from detailed description. Next, as illustrated inFIG.10, the low dielectric member6is provided on the upper surface5aof the internal shield film5. The low dielectric member6is fixed to the upper surface5aof the internal shield film5via an adhesive.

Next, as illustrated inFIG.11, the sealing resin4is provided on the upper surface2aof the substrate2so as to seal the components31and32and the low dielectric member6. The sealing resin4also seals the internal shield film5. At this time, since the low dielectric member6is fixed to the upper surface5aof the internal shield film5with an adhesive, it is possible to prevent displacement when the sealing resin4is provided.

Next, as illustrated inFIG.12, the external shield film7is formed on the upper surface4aof the sealing resin4and the upper side of the low dielectric member6. Further, the external shield film7is formed on the side surface2bof the substrate2and the side surface4bof the sealing resin4. At this time, the low dielectric member6is arranged between the internal shield film5and the external shield film7in a direction orthogonal to the upper surface2aof the substrate2. In this manner, the module1illustrated inFIG.12can be obtained.

Third Embodiment

Next, still another example of the method of manufacturing a module according to the present disclosure will be described.FIGS.5to6and13to15are cross-sectional views schematically illustrating each step in a third embodiment which is an example of the method of manufacturing a module according to the embodiment of the present disclosure.

First, a step of preparing the substrate2on which the component31having the internal shield film5is mounted on the upper surface2awhich is one main surface is similar to that in the first and second embodiments, as illustrated inFIG.5. Next, a step of providing the sealing resin4on the upper surface2aof the substrate2so as to seal the components31and32is similar to that in the first embodiment, as illustrated inFIG.6. For this reason, detailed description of these will be omitted. Next, as illustrated inFIG.13, a part of the sealing resin4is removed from the upper surface4aof the sealing resin4toward the internal shield film5so that the components31and32are not exposed. That is, the sealing resin4remains on an upper surface of the internal shield film5without being removed. As an example, a part of the sealing resin4is removed as the entire upper surface4aof the sealing resin4is polished from a state illustrated inFIG.6to a state illustrated inFIG.13.

Next, as illustrated inFIG.14, the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4is provided in a space formed by removing a part of the sealing resin4. That is, as illustrated inFIG.14, the low dielectric member6is provided over the entire upper surface4aof the sealing resin4. In order to improve adhesion between the low dielectric member6and the sealing resin4, for example, the low dielectric member6can be pressed so as to eliminate a gap between the low dielectric member6and the upper surface4aof the sealing resin4generated by air.

Next, as illustrated inFIG.15, the external shield film7is formed on the upper side of another part of the sealing resin4and on the upper surface6aof the low dielectric member6. Further, the external shield film7is formed on the side surface4bof the sealing resin4and the side surface2bof the substrate2. That is, the low dielectric member6is arranged between the internal shield film5and the external shield film7in a direction orthogonal to the upper surface2aof the substrate2. In this manner, the module1illustrated inFIG.15can be obtained. According to such a method, since the low dielectric member6is also provided on the upper side of the component32not covered with the internal shield film5, parasitic capacitance can be reduced as a whole of the module1.

The module according to the present embodiment includes the substrate2, the components31and32mounted on the upper surface2awhich is one main surface of the substrate2, the internal shield film5provided on an upper surface of the component31, and the sealing resin4provided on the upper surface2aof the substrate2so as to seal the component31. Further, the external shield film7provided on the upper surface4aor the upper side of the sealing resin4, and the low dielectric member6arranged between the internal shield film5and the external shield film7and having a dielectric constant lower than a dielectric constant of the sealing resin4are provided.

According to such a configuration, the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4is provided between the internal shield film5and the external shield film7. As a result, parasitic capacitance generated between the internal shield film5and the external shield film7can be reduced without hindering reduction in height of the module1.

Further, according to the module according to the present embodiment, the low dielectric member6is formed in a tapered shape such that an area of an upper surface on the external shield film7side is larger than an area of a lower surface on the internal shield film5side. According to such a configuration, an area of a contact surface between the external shield film7and the low dielectric member6is further expanded. As a result, the external shield film7and the low dielectric member6can be less likely to be peeled from each other.

Further, according to the module according to the present embodiment, the internal shield film5is further provided on a side surface of the component31, and surface roughness of the internal shield film5provided on the upper surface31aof the component31is greater than surface roughness of the internal shield film5provided on a side surface of the component31. According to such a configuration, the low dielectric member6is brought into closer contact with the internal shield film5provided on the upper surface31aof the component31. As a result, parasitic capacitance generated between the internal shield film5and the external shield film7can be more reliably reduced without hindering reduction in height of the module1.

Further, according to the module according to the present embodiment, at least one of the internal shield film5and the external shield film7is in contact with the low dielectric member6. According to such a configuration, the low dielectric member6and at least one of the internal shield film5and the external shield film7are brought into contact with each other without the sealing resin4interposed between them. As a result, parasitic capacitance generated between the internal shield film5and the external shield film7can be more reliably reduced without hindering reduction in height of the module1.

Further, according to the module according to the present embodiment, the external shield film7in contact with the low dielectric member6is formed of metal which is passive metal and transition metal or an alloy containing the metal. Further, a surface of the low dielectric member6in contact with the metal or the alloy containing the metal has a nitrogen functional group. According to such a configuration, by utilizing property as passive metal of an adhesion layer of the external shield film7, a material of the adhesion layer and oxygen are bonded and oxidized to form a passive state. Further, by utilizing property as transition metal of the adhesion layer of the external shield film7, a material of the adhesion layer and the nitrogen functional group formed on a surface of the low dielectric member6are coordinate-bonded. For this reason, the low dielectric member6can be brought into closer contact with the external shield film7. As a result, parasitic capacitance generated between the internal shield film5and the external shield film7can be reduced without hindering reduction in height of the module1.

The method of manufacturing a module according to the present embodiment includes a step of preparing the substrate2on which the component31having the internal shield film5is mounted on the upper surface2aas one main surface and a step of providing the sealing resin4on the upper surface2aof the substrate2so as to seal the component31. Further, a step of removing a part of the sealing resin4from the upper surface4aof the sealing resin4toward the internal shield film5provided on the upper surface31aof the component31is included. Further, a step of providing the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4in a space formed by removing a part of the sealing resin4is included. Further, a step of forming the external shield film7on the upper side or the upper surface6aof the low dielectric member6and another part of the sealing resin4is included. According to such a method, the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4is provided between the internal shield film5and the external shield film7. As a result, parasitic capacitance generated between the internal shield film5and the external shield film7can be reduced without hindering reduction in height of the module1.

Further, the method of manufacturing a module according to the present embodiment includes a step of preparing the substrate2on which the component31having the internal shield film5is mounted on the upper surface2athat is one main surface. Further, a step of providing a dielectric member on the upper surface5aof the internal shield film5provided on the upper surface31aof the component31is included. Further, a step of providing the sealing resin4on the upper surface2aof the substrate2so as to seal the component31and the dielectric member, and a step of forming a second shield film on the upper side of the dielectric member and the upper surface4aof the sealing resin4are included. Furthermore, the dielectric member is the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4. According to such a method, the low dielectric member6having a dielectric constant lower than a dielectric constant of the sealing resin4is provided between the internal shield film5and the external shield film7. As a result, parasitic capacitance generated between the two shield films can be reduced without hindering reduction in height of the module.

Note that the present disclosure is not limited to the above embodiment and example, and can be implemented in other various modes. For example, in the above description, the component31is a resistor, a capacitor, an inductor, a filter, or a semiconductor element such as an integrated circuit or a power amplifier, but the present disclosure is not limited to this configuration. The component31may be a submodule that includes a substrate, a component, sealing resin, and a shield film, and is mounted on the upper surface2aof the substrate2.

Further, in the above description, a part of the sealing resin4is removed by a laser in order to provide a recess for forming the low dielectric member6in a tapered shape, but the present disclosure is not limited to this configuration. For example, when the sealing resin4is made from photosensitive resin, a recess for forming the low dielectric member6in a tapered shape may be provided by removing a part of the sealing resin4by wet etching.

Further, in the above description, the components31and32are mounted on a mounting electrode via the solder bump21, but the present disclosure is not limited to this configuration. For example, the components31and32may be mounted on the mounting electrode via a conductive adhesive or conductive paste.

Further, in the above description, the external shield film7and the low dielectric member6can be brought into close contact with each other by a nitrogen functional group provided on a surface of the low dielectric member6, but the present disclosure is not limited to this configuration. For example, the sealing resin4and the low dielectric member6may be brought into close contact with each other by a nitrogen functional group provided on a surface of the low dielectric member6.

In the second embodiment, the sealing resin4is provided on the upper surface2aof the substrate2so as to seal the components31and32and the low dielectric member6, and then the external shield film7is formed on the upper surface4aof the sealing resin4and the upper side of the low dielectric member6, but the present disclosure is not limited to this configuration. For example, after a step of providing the sealing resin4, a step of removing a part of the sealing resin4to expose the upper surface6aof the low dielectric member6may be further included. Further, in the step of forming the external shield film7subsequent to the step of exposing the upper surface6aof the low dielectric member6, the external shield film7may be formed on the exposed upper surface6aof the low dielectric member6and the upper surface4aof another part of the sealing resin4. According to such a method, the sealing resin4entering between the internal shield film5and the external shield film7is removed. Further, when the sealing resin4is removed, a part of the low dielectric member6is also removed, a surface of the low dielectric member6becomes rough, and adhesion between the low dielectric member6and the external shield film7can be improved. As a result, it is possible to more reliably reduce parasitic capacitance generated between the two shield films without hindering reduction in height of the module.

According to the module according to the present disclosure, since parasitic capacitance generated between two shield films can be reduced without hindering reduction in height of the module, it is useful, for example, for a module including two or more shield films overlapping in a thickness direction of a substrate.