Patent ID: 12224249

DETAILED DESCRIPTION OF EMBODIMENTS

It is generally noted that components in the drawings may not be drawn to scale, and may be exaggerated for the convenience of explanation. In the following description, when an upper position or a lower position is mentioned, it does not necessarily mean an absolutely upper or lower position, and it may mean a relatively upper or lower position in the illustrated pose.

First Exemplary Embodiment

A module according to a first exemplary embodiment will be described with reference toFIGS.1to2.FIG.1is a cross-sectional view illustrating a module101according to the present embodiment.

As shown, the module101includes a substrate1having a first main surface1a, a first component3amounted on the first main surface1a, a first sealing resin6adisposed so as to cover the first main surface1aand the first component3a, a marking film7covering at least an upper surface of the first sealing resin6a, and a shield film8covering the marking film7. An upper surface of the marking film7is locally formed with a first recess12. The upper surface of the shield film8is preferably formed with a second recess13corresponding to the first recess12.

In an exemplary aspect, the substrate1is a wiring substrate. A GND electrode10is formed by a conductor pattern inside the substrate1. The GND electrode10is exposed from a side surface of the substrate1. In addition to the first component3a, a component3bis mounted on the first main surface1aof the substrate1. The first component3amay be, for example, an integrated circuit (IC). The component3bmay be, for example, an inductor, a capacitor or the like. The first sealing resin6ais formed so as to cover all the components mounted on the first main surface1a.

The substrate1has a second main surface1bopposite to the first main surface1a. The second main surface1bis provided with external terminals15. The external terminals15are solder balls, for example.

FIG.2is an enlarged view illustrating a portion Z1inFIG.1. As shown, the shield film8includes a conductive layer25and a protective layer covering the conductive layer25. In the example illustrated in the drawings, the protective layer is preferably a rustproof layer26. Moreover, the conductive layer25is preferably formed of a material having high conductivity, such as Cu, for example. The rustproof layer26may be formed of, for example, Ni, Cr, Ti, or an alloy of two or more metals selected from Ni, Cr and Ti. The alloy may be, for example, stainless steel (SUS).

The marking film7includes a first layer31and a second layer32covering the first layer31. The first recess12is formed by locally removing the second layer32so as to expose the first layer31. The first layer31is formed of a material which is hard to be removed by laser irradiation, and the second layer32is formed of a material which is easy to be removed by laser irradiation. That is, the second layer32is formed from a material easier to be removed by laser irradiation than the first layer31.

The shield film8includes a first adhesion layer81. In exemplary aspects, the thickness of the first adhesion layer81may be, for example, about 50 nm. The thickness of the conductive layer25may be, for example, 6 μm. The thickness of the rustproof layer26may be, for example, 2 μm.

The marking film7includes a second adhesion layer82. In exemplary aspects, the thickness of the second adhesion layer82may be, for example, about 50 nm. The thickness of the first layer31may be, for example, 6 μm. The thickness of the second layer32may be, for example, 2 μm. The thickness of the marking film7may be the same as or different from the thickness of the shield film8.

In the present embodiment, the upper surface of the marking film7is locally formed with a first recess12, and the upper surface of the shield film8is formed with a second recess13corresponding to the first recess12. In the exemplary aspect, the type or the like of the module101can be identified by visually recognizing the second recess13that is configured as a mark. Advantageously, this mark may be formed without removing the first sealing resin6a. Therefore, the components sealed by the first sealing resin6awill not be affected. According to the present embodiment, the module is constructed to prevent the components mounted thereon from being affected by the printing of a mark and to prevent the layout of the mark from being restricted by the arrangement of the components mounted thereon.

As illustrated in the present embodiment, the marking film7preferably includes the first layer31and the second layer32covering the first layer31, and the first recess12preferably is formed by locally removing the second layer32so as to expose the first layer31. Thus, it is possible to easily perform the step of forming the first recess12, and it is possible to prevent any component under the marking layer7from being affected by laser irradiation.

The first layer31is preferably formed of the same material as the conductive layer25, and the second layer32is preferably formed of the same material as the protective layer. Thus, the marking film7and the shield film8can be formed by using the same or similar manufacturing equipment, which is efficient. For example, a three-layer structure with the same combination may be repeatedly formed twice, and the lower three-layer structure may be used as the marking film7, and the upper three-layer structure may be used as the shield film8.

As illustrated in the present embodiment, the marking film7preferably covers only the upper surface of the first sealing resin6a. Thus, as to be described later, it is possible to employ such a manufacturing method that after a marking film7is formed on the collective substrate, the collective substrate is cut into individual products, which makes it possible to manufacture the products efficiently.

As illustrated in the present embodiment, the shield film8preferably covers the upper surface of the marking film7, the side surface of the marking film7, the side surface of the first sealing resin6a, and the side surface of the substrate1. Thus, the shielding may be performed more reliably.

As illustrated in the present embodiment, a surface of the shield film8closer to the marking film7is preferably formed with a first adhesion layer81. Thus, the shield film8may be more strongly adhered to the marking film7.

As illustrated in the present embodiment, a surface of the marking film7closer to the first sealing resin6ais preferably formed with a second adhesion layer82. Thus, the marking film7may be more strongly adhered to the first sealing resin6a.

Second Exemplary Embodiment

A module according to a second exemplary embodiment will be described with reference toFIG.3.FIG.3is a partial cross-sectional view illustrating a module102according to the present embodiment.

As shown, the module102includes a substrate1having a first main surface1a, a first component3amounted on the first main surface1a, a first sealing resin6adisposed so as to cover the first main surface1aand the first component3a, a marking film7rcovering at least an upper surface of the first sealing resin6a, and a shield film8covering the marking film7r. The upper surface of the marking film7ris locally formed with a first recess12and the upper surface of the shield film8is formed with a second recess13corresponding to the first recess12.

The marking film7ris formed of a material that may be removed, but may not be penetrated by laser irradiation. The marking film7rmay or may not have conductivity and, for example, can be formed of a resin.

Also in the present embodiment, since a mark may be formed without removing the first sealing resin6a, the same effect as that described in the first embodiment may be obtained.

Third Exemplary Embodiment

A module according to a third exemplary embodiment will be described with reference toFIG.4.FIG.4is a cross-sectional view illustrating a module103according to the present embodiment.

In the module103, the marking film7not only covers the upper surface of the first sealing resin6a, but also covers the upper surface of the first sealing resin6a, the side surface of the first sealing resin6a, and the side surface of the substrate1. Also in the present embodiment, the same effect as that described in the first embodiment may be obtained.

Fourth Exemplary Embodiment

A module according to a fourth exemplary embodiment will be described with reference toFIG.5.FIG.5is a cross-sectional view illustrating a module104according to the present embodiment.

As shown, the module104includes a substrate1having a first main surface1a, a first component3amounted on the first main surface1a, a first sealing resin6adisposed so as to cover the first main surface1aand the first component3a, a marking film7covering at least an upper surface of the first sealing resin6a, and a shield film8covering the marking film7. The upper surface of the marking film7ris locally formed with a first recess12and the upper surface of the shield film8is formed with a second recess13corresponding to the first recess12. An enlarged view of a portion Z2inFIG.5is the same as that illustrated inFIG.2.

The substrate1has a second main surface1bopposite to the first main surface1a. A second component3eis mounted on the second main surface1b. A second sealing resin6bis disposed so as to cover the second main surface1band the second component3e. The shield film8covers the side surface of the second sealing resin6b.

In addition to the first component3a, components3band3care mounted on the first main surface1a. Similar to the first component3a, the components3band3care also sealed by the first sealing resin6a. In addition to the second component3e, components3dand3fare mounted on the second main surface1b. A columnar conductor29is provided upright on the second main surface1b. The columnar conductor29penetrates the second sealing resin6b. The columnar conductor29is used as an external electrode of the module104after the module104is mounted on a mother substrate or the like. Again, in the present embodiment, the same effect as that described in the first embodiment may be obtained.

Fifth Exemplary Embodiment

A method of manufacturing a module according to a fifth exemplary embodiment will be described with reference toFIGS.6to10.FIG.6is a flowchart illustrating the method of manufacturing a module according to the present embodiment.

The method of manufacturing a module according to the present embodiment includes a step S1of preparing a collective substrate, a step S2of mounting a first component on a first main surface of the collective substrate, a step S3of disposing a first sealing resin so as to cover the first main surface and the first component, a step S4of forming a marking film so as to cover an upper surface of the first sealing resin, a step S5of forming a first recess by irradiating an upper surface of the marking film with a laser beam, a step S6of cutting the collective substrate into a plurality of module blanks, and a step S7of forming a shield film on each of the plurality of module blanks so as to cover an upper surface and a side surface thereof. Each step will be described below with reference to the drawings.

First, in step S1, as illustrated inFIG.7, a collective substrate400is prepared. The collective substrate400includes a substrate1. The substrate1has a first main surface1aand a second main surface1b. In step S2, as illustrated inFIG.8, a first component3ais mounted on the first main surface1aof the collective substrate400, and a component3bis also mounted on the first main surface1a. In step S3, as illustrated inFIG.9, a first sealing resin6ais disposed so as to cover the first main surface1aand the first component3a. Thus, a collective substrate401is obtained in which the upper surface of the first sealing resin6ais exposed.

Next, in step S4, as illustrated inFIG.10, a marking film7is formed so as to cover the upper surface of the first sealing resin6a. Thus, a collective substrate402is obtained. The marking film7is the same as that described in detail in the first embodiment.

In step S5, as illustrated inFIG.11, a first recess12is formed by laser irradiation. The first recess12is a cavity formed on the upper surface of the first sealing resin6a. Thus, a collective substrate403is obtained.

In step S6, as illustrated inFIG.12, the collective substrate403is cut into a plurality of module blanks404. InFIG.12, the cutting line is indicated by a dashed line. The plurality of module blanks404may be cut by dicing or the like.

In step S7, as illustrated inFIG.13, a shield film8is formed on each module blank404. Thus, a plurality of modules405are obtained. The shield film8covers the upper surface of the marking film7, the side surface of the marking film7, the side surface of the first sealing resin6a, and the side surface of the substrate1. According to exemplary aspects, the shield film8can be formed by any film forming method such as sputtering, vapor deposition, plating, or the like after the second main surface1bof each module blank404is masked. The recesses in the shield film8are formed to correspond to the recesses in the marking film7when the shield film8is formed on each module blank404since the recesses on the marking film7are already formed therein in step S5.

According to the present embodiment, a module is provided that is constructed to prevent a component mounted thereon from being affected by the printing of a mark and to prevent the layout of the mark from being restricted by the arrangement of the component mounted thereon.

The marking film7preferably includes a first layer and a second layer covering the first layer, and in the step S2of forming the first recess12, the first layer is preferably exposed by locally removing the second layer. It is noted that the reason therefore is the same as that described in the first embodiment.

Moreover, it is noted that the marking film7is not necessarily limited to a film including a combination of plural layers. The marking film7may be a single layer film. The marking film7may be any film as long as it may be formed with a recess by laser irradiation and may not be penetrated by the laser beam.

The step S2of forming the first recess12is performed on the collective substrate401. Thus, since the target by laser irradiation is the collective substrate, the first recess12can be formed simultaneously or sequentially on a plurality of module blanks, which makes it possible to perform step S2efficiently.

Instead of performing the step S2on the collective substrate401, the step S2of forming the first recess12can be performed on each individual module blank402after the step S3of cutting the collective substrate401into a plurality of individual module blanks402.

In general, it is noted that the embodiments described above may be appropriately combined. Moreover, the embodiments disclosed herein are illustrative and non-restrictive in all respects.

REFERENCE SIGNS LIST

1: substrate;1a: first main surface;1b: second main surface;3a: first component;3b,3c,3d,3f: component;3e: second component;7,7r: marking film;8: shield film;10: GND electrode;12: first recess;13: second recess;15: external terminal;25: conductive layer;26: rustproof layer;29: columnar conductor;31: first layer;32: second layer;81: first adhesion layer;82: second adhesion layer;101,102,103,104: module;400,401,402,403: collective substrate;404: module blank;405: module