Module

A module (101) is provided with a substrate including a principal surface (1u), a plurality of electronic components (41, 42, and 43) arranged on the principal surface (1u), a sealing resin (3) covering the principal surface (1u), a ground electrode arranged on the principal surface (1u), a conductive layer (6) covering the sealing resin (3), and a magnetic member (5). The conductive layer (6) is electrically connected to the ground electrode by a plurality of connecting conductors (62) arranged so as to penetrate the sealing resin (3), and the magnetic member (5) includes a magnetic member plate-shaped portion arranged so as to cover the sealing resin (3) and a magnetic member wall-shaped portion (52) arranged in a wall shape in the sealing resin (3). The magnetic member wall-shaped portion (52) is longer than each of the connecting conductors (62).

BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

The present disclosure relates to a module.

Description of the Related Art

Japanese Patent Application Laid-Open No. 2013-222829 (Patent Document 1) describes that, in a module in which a plurality of electronic components are arranged, a shielding member containing a metal material is provided so that a mounting surface on which the electronic components are mounted is separated into a plurality of regions.Patent Document 1: Japanese Patent Application Laid-Open No. 2013-222829

BRIEF SUMMARY OF THE DISCLOSURE

In recent years, in a module for use as a communication device, components constituting circuits of a power supply system as well as components for wireless communication are mounted with high density to meet the demand for size reduction. In this case, as the mounting density of the components in the module increases, it is necessary not only to strengthen an electromagnetic shield for suppressing an influence of an electromagnetic wave but also to strengthen a magnetic shield, and therefore a shielding structure satisfying both the electromagnetic shield and the magnetic shield is required. The shielding member described in Patent Document 1 is either a “metal member” functioning as the electromagnetic shield or an “electromagnetic wave absorber containing a soft magnetic material” functioning as the magnetic shield and has only one of the functions.

Therefore, an object of the present disclosure is to provide a module satisfying both an electromagnetic shield and a magnetic shield while securing a mounting area.

In order to achieve the above object, a module according to the present disclosure is provided with a substrate including a principal surface, a plurality of electronic components arranged on the principal surface, a sealing resin covering the principal surface and the plurality of electronic components, a ground electrode arranged on the principal surface, a conductive layer covering the sealing resin, and a magnetic member. The conductive layer is electrically connected to the ground electrode by a plurality of connecting conductors arranged so as to penetrate the sealing resin. The magnetic member includes a magnetic member plate-shaped portion arranged so as to cover the sealing resin and a single magnetic member wall-shaped portion arranged in a wall shape between any of the plurality of electronic components in the sealing resin or a plurality of magnetic member wall-shaped portions intermittently arranged in a wall shape between any of the plurality of electronic components in the sealing resin. When viewed in a direction perpendicular to the principal surface, each of the plurality of connecting conductors includes a portion arranged so as to at least partially overlap with a strip-shaped region virtualized on an extension of the single magnetic member wall-shaped portion or the plurality of magnetic member wall-shaped portions. A length of the single magnetic member wall-shaped portion or any one of the plurality of magnetic member wall-shaped portions is longer than a length of each of the connecting conductors.

According to the present disclosure, it is possible to satisfy both an electromagnetic shield and a magnetic shield while securing a mounting area.

DETAILED DESCRIPTION OF THE DISCLOSURE

The dimensional ratios illustrated in the drawings do not necessarily represent an accurate and actual situation, and the dimensional ratios may be exaggerated for convenience of description. In the following description, in a case in which a concept of an upper or lower side is referred to, the upper or lower side does not necessarily mean an absolute upper or lower side and may mean a relative upper or lower side in the illustrated posture.

A module according to Embodiment 1 based on the present disclosure will be described with reference toFIGS.1to5. An external view of a module101according to the present embodiment is illustrated inFIG.1. An upper surface and a side surface of the module101are covered with a conductive layer6. The module101inFIG.1as viewed obliquely from a lower side is illustrated inFIG.2. A lower surface of the module101is not covered with the conductive layer6and has a substrate1exposed therefrom. A lower surface of the substrate1is provided with one or more external connection electrodes11. The number, size, and arrangement of the external connection electrodes11illustrated inFIG.2are illustrative only. The substrate1may be provided with wires on the surface or inside. The substrate1may be a resin substrate or a ceramic substrate. The substrate1may be a multilayer substrate. A plan view of the module101is illustrated inFIG.3.FIG.3corresponds to a view, viewed from an upper side, of a state in which an upper surface of the conductive layer6of the module101is removed. A sectional view taken along the line IV-IV inFIG.3is illustrated inFIG.4. Electronic components41,42, and43are mounted on a principal surface1uof the substrate1. The electronic components41,42, and43are covered with a mold resin3. The electronic components41and42may be integrated circuits (ICs), for example. A sectional view taken along the line V-V inFIG.3is illustrated inFIG.5. While, inFIG.3, the state in which the upper surface of the conductive layer6is removed is viewed,FIGS.4and5are sectional views of a state in which the upper surface of the conductive layer6is present. Each of the external connection electrodes11is electrically connected to an internal conductor pattern13with a conductor via12provided so as to penetrate an insulating layer2interposed therebetween. As illustrated inFIG.4, the substrate1is a lamination of the plurality of insulating layers2. The configuration of the substrate1illustrated here is illustrative only and is not always the case.

The module101according to the present embodiment is provided with the substrate1including the principal surface1u, the plurality of electronic components arranged on the principal surface1u, the sealing resin3covering the principal surface1uand the plurality of electronic components, a ground electrode14arranged on the principal surface1u, the conductive layer6covering the sealing resin3, and a magnetic member5. The conductive layer6is electrically connected to the ground electrode14by a plurality of connecting conductors62arranged so as to penetrate the sealing resin3. The magnetic member5includes a magnetic member plate-shaped portion51arranged so as to cover the sealing resin3and “a single magnetic member wall-shaped portion arranged in a wall shape in the sealing resin3or a plurality of magnetic member wall-shaped portions intermittently arranged in a wall shape in the sealing resin3”. “The single magnetic member wall-shaped portion arranged in a wall shape in the sealing resin3or the plurality of magnetic member wall-shaped portions intermittently arranged in a wall shape in the sealing resin3” is hereinbelow referred to as “a magnetic member wall-shaped portion or the like”. InFIG.3, as an example of the magnetic member wall-shaped portion or the like, the module101is provided with a plurality of magnetic shield wall-shaped portions52intermittently arranged in a wall shape. The plurality of magnetic member wall-shaped portions52are arranged in a wall shape between any of the plurality of electronic components. Each of the magnetic member wall-shaped portion52may be formed by filling a trench formed in the sealing resin3with a magnetic material. The magnetic material to be filled in the trench may be an alloy such as an Fe—Co-based alloy and an Fe—Ni-based alloy or a ferrite material such as NiZn and MnZn, for example. Alternatively, the magnetic material may be made by permalloy plating. The term “permalloy plating” as used herein means plating containing an Ni—Fe alloy. The conductive layer6preferably contains metal. The conductive layer6preferably contains copper, aluminum, gold, or an alloy containing any of these, for example.

Here, when viewed in a direction perpendicular to the principal surface1u, each of the plurality of connecting conductors62includes a portion arranged so as to at least partially overlap with a strip-shaped region virtualized on an extension of the magnetic member wall-shaped portion or the like. Actually, inFIG.3, the connecting conductors62are arranged so as to almost overlap with the whole strip-shaped region virtualized on an extension of the magnetic member wall-shaped portion52. The concept of the “strip-shaped region” mentioned here will be described in detail below.

Also, a length of the “single magnetic member wall-shaped portion” or the “any one of the plurality of magnetic member wall-shaped portions” along a longitudinal direction of the strip-shaped region is longer than a length of the adjacent connecting conductor along the longitudinal direction of the strip-shaped region.

That is, in a case in which a dimension in a direction parallel to the principal surface of the substrate is defined as a “length”, the length of the magnetic member wall-shaped portion is longer than the length of the connecting conductor.

In the present embodiment, the conductive layer6serves as an electromagnetic shield shielding an electromagnetic wave, and the magnetic member5serves as a magnetic shield shielding magnetism.

In the present embodiment, since each of the connecting conductors62includes a portion arranged so as to at least partially overlap with the virtual strip-shaped region, it is possible to prevent the magnetic member5and the conductive layer6from being arranged as parallel separate wall-shaped members on the principal surface1u.

Accordingly, in the present embodiment, it is possible to satisfy both an electromagnetic shield and a magnetic shield while securing a mounting area.

By arranging the plurality of magnetic member wall-shaped portions52and the plurality of connecting conductors62in the above manner, the plurality of magnetic member wall-shaped portions52and the plurality of connecting conductors62can be arranged along a desired shape. Therefore, an electromagnetic shield and a magnetic shield for a specific component can be strengthened, for example.

Also, in the present embodiment, by intermittently arranging the magnetic member wall-shaped portions52and the connecting conductors62, it is possible to avoid a structure in which the sealing resin3is fully divided, which enables a problem caused by warpage at the time of curing and shrinkage of the sealing resin3or warpage due to thermal expansion at the time of use to be suppressed.

InFIG.3, although each of the connecting conductors62is illustrated as a square, the shape of the connecting conductor62is not limited to the square and may be another shape. Each of the connecting conductors62may be in a linear shape in a similar manner to each of the magnetic member wall-shaped portions52. However, in a case in which attention is focused on the relationship in length along the longitudinal direction of the strip-shaped region, the length of the shortest one out of the plurality of magnetic member wall-shaped portions52is longer than the length of the longest one out of the plurality of connecting conductors62.

Also, since the length of each of the magnetic member wall-shaped portions is longer than the length of each of the connecting conductors, an influence of magnetism can be suppressed more efficiently while an influence of an electromagnetic wave is suppressed.

InFIG.4, although a conductor pattern18is connected to a lower end of the magnetic member wall-shaped portion52, the lower end of the magnetic member wall-shaped portion52is not required to be connected to a certain conductor pattern. Although the conductive layer6is preferably electrically connected to the ground electrode14, the magnetic member5is not required to be electrically connected to the ground electrode14. In order to serve as a magnetic shield, the magnetic member wall-shaped portion52is not necessarily required to fully separate the sealing resin3from the upper end to the lower end of the sealing resin3but is merely required to exist as a wall having a certain area. For example, the lower end of the magnetic member wall-shaped portion52may be located slightly above the lower end of the sealing resin3. That is, there may be a gap between the lower end of the magnetic member wall-shaped portion52and the principal surface1uof the substrate1.

The reason for this is that the magnetic material functions as a magnetic shield in a mechanism of absorbing magnetism and converting the magnetism into heat. The conductor pattern18illustrated immediately below the magnetic member wall-shaped portion52inFIG.4may not exist.

A method for manufacturing the module according to the present embodiment is substantially similar to a method for manufacturing a module102described below in Embodiment 2. The module101can be obtained by appropriately changing the arrangement of the magnetic member wall-shaped portions52and the connecting conductors62in the manufacturing method described in Embodiment 2.

A module according to Embodiment 2 based on the present disclosure will be described with reference toFIG.6. A plan view of a module102according to the present embodiment is illustrated inFIG.6.FIG.6corresponds to a view, viewed from an upper side, of a state in which an upper surface of the conductive layer6of the module102is removed. The configuration of the module102is basically similar to that of the module101described in Embodiment 1 but differs in the following points.

In the module102, the sealing resin3includes a sealing resin side surface3s.

A set of all the side surfaces on the outer periphery of the sealing resin3corresponds to the sealing resin side surface3s. At least one of the plurality of magnetic member wall-shaped portions52is exposed from the sealing resin3at a first portion3s1of the sealing resin side surface3s. At least one of the plurality of connecting conductors62is exposed from the sealing resin3at a second portion3s2of the sealing resin side surface3s. The plurality of connecting conductors62include at least two types of connecting conductors. That is, the plurality of connecting conductors62include one or more connecting conductors62aand one or more connecting conductors62b. As illustrated inFIG.6, the connecting conductor62bis connected to a portion63of the electromagnetic shield. The connecting conductor62bmay extend in a wall shape as illustrated inFIG.6.

In the present embodiment as well, a similar effect to that of Embodiment 1 can be obtained. Also, in the present embodiment, the magnetic member wall-shaped portion52and the connecting conductor62are arranged so as to reach the sealing resin side surface3sat certain positions, the magnetic member wall-shaped portion52is connected to a portion53of the magnetic shield covering the side surface of the sealing resin3and the side surface of the substrate1, and the connecting conductor62is connected to the portion63of the electromagnetic shield covering the side surface of the sealing resin3. Accordingly, the shielding property can be improved.

The module102according to the present embodiment can be manufactured in the following manner. As illustrated inFIG.7, the electronic components41and42are mounted on the principal surface1uof the substrate1. As illustrated inFIG.8, the electronic components41and42are sealed by the sealing resin3. As illustrated inFIG.9, a trench16for a magnetic shield is formed in the sealing resin3. To form the trench16, laser processing may be used, for example.

As illustrated inFIG.10, the trench16is filled with a paste of a magnetic material. In this manner, the magnetic member wall-shaped portion52is formed. A sectional view taken along the line XI-XI inFIG.10is illustrated inFIG.11. The magnetic member plate-shaped portion51is arranged on the upper surface of this structure. The portion53is arranged so as to cover the side surface of this structure. The magnetic member plate-shaped portion51and the portion53are formed with use of a magnetic material. The magnetic member plate-shaped portion51and the portion53may be formed integrally. This state is illustrated inFIG.12.

A sectional view taken along the line XIII-XIII inFIG.12is illustrated inFIG.13.

A trench for an electromagnetic shield is formed in the sealing resin3. This trench is formed to be shorter than the trench16for the magnetic shield. One end of the trench for the electromagnetic shield is formed so as to be exposed to the sealing resin side surface3s.

Further, one end of the trench for the electromagnetic shield is formed so as to pass through the portion53of the magnetic member5and be exposed to the outer side surface thereof. The trench for the electromagnetic shield is filled with a paste of a conductive material. A state in which the processes to this point have been completed is illustrated inFIG.14. Subsequently, a film of a conductive material is attached so as to cover the whole top surface and side surface by a method such as sputtering. That is, a portion61and the portion63are formed. In this manner, the portion61, the connecting conductor62, and the portion63are combined to cause the conductive layer6to be formed. The conductive layer6serves as the electromagnetic shield. In this manner, the module102illustrated inFIG.6is obtained.

A module according to Embodiment 3 based on the present disclosure will be described with reference toFIGS.15to17. A plan view of a module103according to the present embodiment is illustrated inFIG.15.FIG.15corresponds to a view, viewed from an upper side, of a state in which an upper surface of the conductive layer6of the module103is removed. A sectional view taken along the line XVI-XVI inFIG.15is illustrated inFIG.16. While, inFIG.15, the state in which the upper surface of the conductive layer6is removed is viewed,FIG.16is a sectional view of a state in which the upper surface of the conductive layer6is present. A state in which the magnetic member plate-shaped portion51is removed inFIG.15is illustrated inFIG.17. The configuration of the module103is basically similar to that of the module101described in Embodiment 1 but differs in the following points.

The magnetic member plate-shaped portion51covers only a small range as compared with the portion61of the conductive layer6. The magnetic member plate-shaped portion51covers a region corresponding to the electronic component41. The size of the magnetic member plate-shaped portion51is slightly larger than the size of the electronic component41. The magnetic member wall-shaped portions52are arranged so as to surround the electronic component41. The magnetic member wall-shaped portions52are spaced from the electronic component41. The upper ends of the magnetic member wall-shaped portions52are connected to the magnetic member plate-shaped portion51in the vicinity of the outer periphery of the magnetic member plate-shaped portion51.

The configuration of the module103according to the present embodiment can be summarized and expressed in the following manner.

In the module103, the magnetic member plate-shaped portion51is interposed between the conductive layer6and the sealing resin3. Also, when viewed in a direction perpendicular to the principal surface1u, the area of the magnetic member plate-shaped portion51is smaller than the area of the conductive layer6, and, in a first region surrounded by the conductive layer6, a second region smaller than the first region and surrounded by the magnetic member5exists. The “first region” mentioned here refers to a whole region surrounded by the conductive layer6further on the upper side than the principal surface1uof the substrate1inFIG.16. The “second region” refers to a region surrounded by the magnetic member5further on the upper side than the principal surface1uof the substrate1inFIG.16. The configuration of the module103according to the present embodiment can also be regarded as a configuration in which a magnetically shielded small room is provided inside an electromagnetically shielded large room.

In this configuration as well, it can be stated that the plurality of magnetic member wall-shaped portions52and the plurality of connecting conductors62satisfy the conditions described in Embodiment 1. In the present embodiment as well, the length of any one of the magnetic member wall-shaped portions52is longer than the length of the adjacent connecting conductor62.

In the present embodiment as well as in Embodiment 1, it is possible to satisfy both an electromagnetic shield and a magnetic shield while securing a mounting area. In the present embodiment, the electromagnetic shield in the first region can be achieved, and only a desired region which is a part of the first region can magnetically be shielded. In this manner, it is also possible to shield intensively and magnetically only a specific component.

A module according to Embodiment 4 based on the present disclosure will be described with reference toFIGS.18to20. A plan view of a module104according to the present embodiment is illustrated inFIG.18.FIG.18corresponds to a view, viewed from an upper side, of a state in which an upper surface of the conductive layer6of the module104is removed. A sectional view taken along the line XIX-XIX inFIG.18is illustrated inFIG.19. While, inFIG.18, the state in which the upper surface of the conductive layer6is removed is viewed,FIG.19is a sectional view of a state in which the upper surface of the conductive layer6is present. A state in which the magnetic member plate-shaped portion51is removed inFIG.18is illustrated inFIG.20. The configuration of the module104is basically similar to that of the module103described in Embodiment 3 but differs in the following points.

In the module104according to the present embodiment, the magnetic member5surrounds the whole upper surface of the electronic component41and about half of the side surface. As illustrated inFIG.19, on the upper side of the electronic component41, the magnetic member plate-shaped portion51and the portion61overlap with each other. That is, both an electromagnetic shield and a magnetic shield are provided on the upper surface of the electronic component41. As illustrated inFIG.20, on about the left half of the outer periphery of the electronic component41in a planar view, the connecting conductors62are arranged along the outer periphery of the electronic component41. On about the other half, that is, on about the right half, the magnetic member wall-shaped portion52is arranged along the outer periphery of the electronic component41. Therefore, it can be stated that a magnetic shield between the electronic component41and the outside is secured on the right half of the electronic component41inFIG.20.

The configuration of the module104according to the present embodiment can also be regarded as a configuration in which an eave for a magnetic shield is provided inside an electromagnetically shielded large room.

In the present embodiment as well as in Embodiment 1, it is possible to satisfy both an electromagnetic shield and a magnetic shield while securing a mounting area. In the present embodiment, the electromagnetic shield in a first region can be achieved, and a desired portion of the electronic component41arranged in the first region can magnetically be shielded. In this manner, it is also possible to shield each desired portion intensively and magnetically shield in a specific component instead of each component.

InFIG.20, for example, in a case in which it is not necessary to provide a magnetic shield that surrounds the whole electronic component41, but in which it is desired to provide a magnetic shield between the electronic component41and the electronic components42and44, providing the magnetic member wall-shaped portion52as illustrated inFIG.20can save waste and is preferable.

The concept of the virtual “strip-shaped region” described in the above embodiments will be described further in detail. For example, the strip-shaped region as illustrated inFIG.21is raised as a simple example. InFIG.21, the magnetic member wall-shaped portions52exist on the upper and lower sides, respectively. Each of the magnetic member wall-shaped portions52has a certain width. A region extending with the same width from either the upper or lower magnetic member wall-shaped portion52is assumed. In other words, extension lines are drawn in the longitudinal direction from the left-hand side and the right-hand side of the magnetic member wall-shaped portion52. That is, two extension lines as illustrated by the dashed-dotted lines are assumed. The region residing between the two dashed-dotted lines is the strip-shaped region. In the example illustrated inFIG.21, the connecting conductor62is arranged so as to fit exactly in the strip-shaped region.

The connecting conductor62does not necessarily fit in the strip-shaped region properly as illustrated inFIG.21and may be located at a slightly displaced position. For example, the example illustrated inFIG.22may be employed. InFIG.22, the connecting conductor62protrudes from the strip-shaped region but does not fully deviate, and a part of the connecting conductor62overlaps with the strip-shaped region. Such arrangement may be employed.

AlthoughFIGS.21and22illustrate examples in which two magnetic member wall-shaped portions52are arranged in a straight line, the two magnetic member wall-shaped portions52may not be arranged in a straight line but may be arranged in a curved line. In this case, the extension lines may be assumed to be curved lines.

The two magnetic member wall-shaped portions52may extend in different directions.FIG.23illustrates an example in which the two magnetic member wall-shaped portions52extend in directions perpendicular to each other. As illustrated by the dashed-dotted lines, extension lines extend from each of the two magnetic member wall-shaped portions52. As a result, one pair consisting of two dashed-dotted lines intersects with the other pair consisting of two dashed-dotted lines at right angles. A region surrounded by the four dashed-dotted lines appears as a substantially square region. This substantially square region is hereinbelow referred to as an “overlapping region”. In the example illustrated inFIG.23, the connecting conductor62is arranged so as to exactly coincide with the overlapping region. InFIG.23, the strip-shaped region includes a portion extending downward from the upper magnetic member wall-shaped portion52to reach the overlapping region and a portion extending from the overlapping region toward the right side. That is, the strip-shaped region is virtualized as an L-shaped figure with the overlapping region as the apex. InFIG.23, a region further on the left side than the overlapping region and a region further on the lower side than the overlapping region are not included in the strip-shaped region.FIG.24illustrates an example in which the connecting conductor62is slightly displaced. Even in such arrangement, a part of the connecting conductor62overlaps with the overlapping region. That is, a part of the connecting conductor62overlaps with the strip-shaped region. The positional relationship as illustrated inFIG.24may be employed.

A module according to Embodiment 5 based on the present disclosure will be described with reference toFIG.25. A sectional view of a module105according to the present embodiment is illustrated inFIG.25. The module105according to the present embodiment is similar to the module101described in Embodiment 1 in terms of the basic configuration but has the following configuration.

The module105has a double-sided mounting structure. That is, in the module105, the substrate1includes a principal surface1aand a second principal surface1bas a surface opposite to the principal surface1a. The module105is provided with a second electronic component arranged on the second principal surface1b. That is, in the module105, electronic components45and46are mounted on the second principal surface1b, for example. As the “second electronic component”, at least one electronic component may be arranged. The electronic components41and42are sealed with a sealing resin3a. The electronic components45and46are sealed with a second sealing resin3b. The electronic components45and46may be exposed from the second sealing resin3b. The module105is provided with a columnar conductor23as an external terminal provided on the second principal surface1b. The columnar conductor23penetrates the second sealing resin3b. In the example illustrated here, the lower surface of the columnar conductor23is exposed to the outside. The columnar conductor23may be either a convexity electrode or a metal pin. The columnar conductor23may be formed by plating. A solder bump may be connected to the lower end of the columnar conductor23.

The configuration of the external terminal illustrated here is illustrative only and is not always the case. For example, a solder bump may be used instead of the columnar conductor23.

Note that some of the above-described embodiments may appropriately be combined and employed. For example, in any of the configurations in Embodiments 2 to 4, a double-sided mounting structure as in Embodiment 5 may be employed.

Note that the embodiments disclosed here are illustrative only and are not limitative in all respects. The scope of the present disclosure is defined by the claims, and the present disclosure includes any modifications within the meaning and scope equivalent to those of the claims.1: Substrate1a,1u: Principal surface1b: Second principal surface2: Insulating layer3,3a: Sealing resin3b: Second sealing resin3s: Sealing resin side surface3s1: First portion3s2: Second portion5: Magnetic member6: Conductive layer11: External connection electrode12: Conductor via13: Internal conductor pattern14: Ground electrode16: Trench18: Conductor pattern23: Columnar conductor41,42,43,45,46: Electronic component51: Magnetic member plate-shaped portion52: Magnetic member wall-shaped portion53: Portion (of magnetic member covering side surface of sealing resin and side surface of substrate)61: Portion (of conductive layer covering upper surface of sealing resin)62,62a,62b: Connecting conductor63: Portion (of conductive layer covering side surface of sealing resin)101,102,103,104: Module