MODULE

A module comprises: a substrate having a first surface; a first component that is mounted on the first surface; a first sealing resin that covers the first surface and at least a portion of the first component that is connected to the first surface; a first conductor pattern that is disposed on a surface of the first sealing resin that is farther from the first surface; and a wire that serves as a plurality of connecting conductors each electrically interconnecting the first surface and the first conductor pattern, wherein when viewed in a direction perpendicular to the first surface, the plurality of connecting conductors are disposed so as to surround the first component, and the first conductor pattern includes a frame-shaped portion that electrically interconnects the plurality of connecting conductors outside the first component successively.

BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

The present disclosure relates to a module.

Description of the Related Art

U.S. Patent Application Publication No. US2018/0323170A1 (PTL 1) discloses a semiconductor package comprising a compartment shield structure (see PTL 1, FIG. 9A and paragraph 0098). In this semiconductor package, electronic components are mounted on opposite surfaces of a substrate, and these electronic components are sealed on upper and lower sides of the substrate by a sealing material. A shield film convers upper and side surfaces of the sealing material located on the upper side of the substrate. The compartment shield structure is implemented so as to surround the electronic component mounted on the lower surface of the substrate, and a portion thereof forming a lower surface is exposed at a lower surface of the sealing material. While a portion of the lower surface of the sealing material on the lower side of the substrate is covered with the shield film, the remaining portion thereof is exposed without being covered with the shield film. An external connection terminal is provided at a peripheral edge of the lower surface of the substrate. At the location where the external connection terminal is disposed, a through hole is provided through the sealing material located on the lower side of the substrate, and the external connection terminal is disposed so as to project downward from the sealing material.(PTL 1) U.S. Patent Application Publication No. US2018/0323170A1

BRIEF SUMMARY OF THE DISCLOSURE

While According to PTL 1 the compartment shield is implemented by disposing on the lower surface of the sealing material a conductive film having a size larger than that of the component mounted on the lower surface of the substrate, a conductive film having a further larger area will be required when a larger number of components are mounded or the component is increased in size.

When a conductive film having a large area is disposed on the lower surface of the sealing material in order to implement the compartment shield, the conductive film is more likely to peel off the sealing material as they have different coefficients of thermal expansion.

Accordingly, an object of the present disclosure is to provide a module that implements a compartment shield for a component mounted on a lower surface of a substrate while suppressing a possibility of peeling.

In order to achieve the above object, a module according to the present disclosure comprises: a substrate having a first surface; a first component that is mounted on the first surface; a first sealing resin that covers the first surface and at least a portion of the first component that is connected to the first surface; a first conductor pattern disposed on a surface of the first sealing resin that is farther from the first surface; and a wire that serves as a plurality of connecting conductors each electrically interconnecting the first surface and the first conductor pattern. When viewed in a direction perpendicular to the first surface, the plurality of connecting conductors are disposed so as to surround the first component, and the first conductor pattern includes a frame-shaped portion that electrically interconnects the plurality of connecting conductors outside the first component successively.

According to the present disclosure, a compartment shield is formed by surrounding a first component by a plurality of connecting conductors and a first conductor pattern. And rather than disposing a conductor pattern of a large area on a surface of a first sealing resin farther from a first surface, a frame-shaped portion of the first conductor pattern is disposed on the surface of the first sealing resin farther from the first surface, and a problem of peeling due to a difference between coefficients of thermal expansion is thus less likely to occur, and as a result, a module that implements a compartment shield for a component mounted on a lower surface of a substrate while suppressing a possibility of peeling can be implemented.

DETAILED DESCRIPTION OF THE DISCLOSURE

The figures indicate a dimensional ratio, which does not necessarily provide a representation which is faithful to reality, and may be exaggerated for the sake of illustration. In the following description, when referring to a concept of being upper or lower, it does not necessarily mean being absolutely upper or lower and may instead mean being relatively upper or lower in a position shown in a figure.

First Embodiment

A module according to a first embodiment of the present disclosure will now be described with reference toFIGS. 1 to 5.FIG. 1is a perspective view of a module101according to the present embodiment.FIG. 2is a plan view of module101.FIG. 3is a cross section taken along a line III-III indicated inFIG. 2.FIG. 4is a bottom view of module101. Note that, for the sake of illustration,FIG. 3also shows components having a positional relationship which should not allow the components to appear together in the same cross section. This also applies to other cross sections described below.

Module101comprises: a substrate1having a first surface1a; a first component3athat is mounted on first surface1a; a first sealing resin6athat covers first surface1aand at least a portion of first component3athat is connected to first surface1a; a first conductor pattern10that is disposed on a surface of first sealing resin6athat is farther from first surface1a; and a wire16that serves as a plurality of connecting conductors each electrically interconnecting first surface1aand first conductor pattern10. When viewed in a direction perpendicular to first surface1a, the plurality of connecting conductors are disposed so as to surround first component3a, and first conductor pattern10includes a frame-shaped portion10fthat electrically interconnects the plurality of connecting conductors outside first component3asuccessively.

Substrate1has a second surface1bon a side opposite to first surface1a. Module101comprises a second component3bmounted on second surface1b, and a second sealing resin6bthat covers second surface1band second component3b.

In the example indicated herein, in addition to second component3b, a component3dand a component3eare mounted on second surface1bof substrate1. Second sealing resin6bis formed so as to cover all of the components mounted on second surface1b. On first surface1aof substrate1, a component3cis mounted in addition to first component3a. First sealing resin6ais formed so as to cover component3c. A surface of a portion of first component3ais exposed from first sealing resin6a.

As shown inFIG. 3, a shield film8is formed so as to cover upper and side surfaces of second sealing resin6b, a side surface of substrate1, and a side surface of first sealing resin6a. Shield film8is a conductive film. Shield film8is, for example, a metal film. Shield film8may be formed by sputtering, for example. As shown inFIG. 3, shield film8is electrically connected to conductor pattern7disposed in substrate1. Conductor pattern7is a ground electrode. Conductor pattern7is exposed on a side surface of substrate1.

FIG. 5shows a structure of a portion in which wire16as a plurality of connecting conductors electrically interconnects first surface1aand first conductor pattern10. A pad electrode17is formed on first surface1a, and wire16has ends each connected to pad electrode17.

As shown inFIG. 3, a columnar conductor15is disposed on a peripheral edge portion of first surface1aof substrate1. Columnar conductor15penetrates through first sealing resin6a. An end face of columnar conductor15located on a side further from first surface1ais exposed from first sealing resin6aand serves as an external connection terminal9. As shown inFIG. 4, at the lower surface of module101, external connection terminal9is arranged along the peripheral edge portion. While a plurality of external connection terminals9are mainly terminals provided for a signal line, some of the plurality of external connection terminals9may be a ground terminal.

In the present embodiment, a compartment shield can be implemented since first component3ais surrounded by the plurality of connecting conductors and first conductor pattern10. In particular, rather than disposing a conductor pattern of a large area on a surface of first sealing resin6afarther from first surface1a, frame-shaped portion10fof first conductor pattern10is disposed on the surface of first sealing resin6afarther from first surface1a, and a problem of peeling due to a difference between the coefficient of thermal expansion of the conductive film and that of the sealing material is also less likely to occur. Therefore, in the present embodiment, a compartment shield for a component mounted on a lower surface of a substrate can be implemented while suppressing a possibility of peeling.

As indicated in the present embodiment, it is preferable that the surface of first component3afarther from first surface1abe exposed from first sealing resin6a. By adopting this configuration, heat radiation from first component3acan be promoted. Further, first sealing resin6adoes not need to cover first component3a, and first sealing resin6acan be reduced in thickness on the side of first surface1a, thereby contributing to reduction in height of the entire module.

As indicated in the present embodiment, it is preferable to comprise shield film8disposed so as to cover a surface of second sealing resin6bfarther from second surface1band a side surface of second sealing resin6b, a side surface of substrate1, and a side surface of first sealing resin6a. By adopting this configuration, an external electromagnetic wave can be shielded.

The structure shown inFIG. 5may be such that, as shown inFIG. 6, wire16is disposed in the form of an arch interconnecting two pad electrodes17, and sealed with first sealing resin6a, and thereafter, as shown inFIG. 7, first sealing resin6ahas a surface polished to thereby remove an apex of the arch of wire16. In this way, wire16forming a single arch will be right and left, separated wires16. Thereafter forming first conductor pattern10allows theFIG. 5structure to be formed. As shown inFIG. 5, it is preferable that the connecting conductor be wire16that has opposite ends each connected to first surface1aand is also disposed so as to rise from first surface1ain the form of an arch, and has removed a portion thereof located farther from first surface1a. As a portion of wire16is polished or the like and thus removed, a flat surface of wire16is formed, and a large contact area between first conductor pattern10and wire16can be ensured.

Second Embodiment

A module according to a second embodiment of the present disclosure will now be described with reference toFIGS. 8 to 10.FIG. 8is a plan view of a module102in the present embodiment.FIG. 9is a cross section taken along a line IX-IX indicated inFIG. 8.FIG. 10is a bottom view of module102. While module102has a basic configuration similar to that of module101described in the first embodiment, the former has the following configuration.

In module102, first conductor pattern10includes a land-shaped portion10nthat projects from frame-shaped portion10fin a direction parallel to first surface1a.

As has been indicated in the present embodiment, as first conductor pattern10includes land-shaped portion10n, module102can be grounded using land-shaped portion10n. It is also preferable to expose at least a portion of land-shaped portion10nfrom a resist film (not shown) when the resist film covers a major portion of the lower surface of the module. When the module is to be mounted on a mother board, and frame-shaped portion10fis too narrow to be electrically connected, land-shaped portion10nthat ensures a large area can be used to facilitate electrical connection to first conductor pattern10. Electrical connection as referred to herein is, for example, connection to a ground terminal prepared on the side of the mother board.

Third Embodiment

A module according to a third embodiment of the present disclosure will now be described with reference toFIGS. 11 to 13.FIG. 11is a plan view of a module103according to the present embodiment.FIG. 12is a cross section taken along a line XII-XII indicated inFIG. 11.FIG. 13is a bottom view of module103. While module103has a basic configuration similar to that of module101described in the first embodiment, the former has the following configuration.

Module103comprises: a substrate1having a first surface1a; a first component3athat is mounted on first surface1a; a first sealing resin6athat covers first surface1aand first component3a; a first conductor pattern10that is disposed on a surface of first sealing resin6athat is farther from first surface1a; and a wire16that serves as a plurality of connecting conductors each electrically interconnecting first surface1aand first conductor pattern10. When viewed in a direction perpendicular to first surface1a, the plurality of connecting conductors are disposed to surround first component3a, and first conductor pattern10includes a plurality of tile-shaped portions10edisposed to cover a region overlapping first component3aand the plurality of connecting conductors.

Substrate1has a second surface1bon a side opposite to first surface1a. Module103comprises a second component3bmounted on second surface1b, and a second sealing resin6bthat covers second surface1band second component3b.

In the present embodiment, rather than disposing a conductor pattern of a large area on a surface of first sealing resin6afarther from first surface1a, the plurality of tile-shaped portions10eare disposed to implement the compartment shield, and individual tile-shaped portion10ecan have a small area. Thus, a problem of peeling due to a difference between the coefficient of thermal expansion of the conductive film and that of the sealing material is less likely to occur, and in the present embodiment, the compartment shield can be implemented while suppressing a possibility of peeling.

As has been indicated in the present embodiment, it is preferable that at least some of the plurality of tile-shaped portions10ebe interconnected.

As in a module104shown inFIG. 14, the plurality of tile-shaped portions10emay not be interconnected and may instead be disposed as separate conductor patterns. In this case as well, one or more wires16are electrically connected to each tile-shaped portion10e.

Fourth Embodiment

A module according to a fourth embodiment of the present disclosure will now be described with reference toFIGS. 16 and 17.FIG. 16is a cross section of a module106in the present embodiment.FIG. 17is a bottom view of module106.

While module106has a basic configuration similar to that of module101described in the first embodiment, the former has the following configuration.

In module106, first conductor pattern10includes a plurality of tile-shaped portions10einside frame-shaped portion10f. The plurality of tile-shaped portions10eare connected to frame-shaped portion10f.

The present embodiment can also achieve an effect similar to that described in the first and third embodiments.

Each embodiment described above has been described by referring to an example in which the plurality of connecting conductors electrically interconnecting first surface1aand first conductor pattern10are wire16. The connecting conductor may be in a form other than a wire. The connecting conductor is preferably any one of a wire, a pin, a metal block, and a plating film. For example,FIG. 18is a partial cross section in a vicinity of a connecting conductor when the connecting conductor is a pin18. Pin18is made of metal. Pin18is disposed so as to penetrate through first sealing resin6a. Pad electrode17is formed on first surface1aof substrate1. An end of pin18that is closer to substrate1is connected to pad electrode17.

While each embodiment described above has been described by referring to a module having a double-sided mounting structure by way of example, the module according to the present disclosure may be a module having a single-sided mounting structure. For example, the module may have a configuration in which no second component is mounted on second surface1bof substrate1and the second sealing resin is not disposed.

Note that a plurality of the above embodiments may be combined as appropriate and employed.