Electronic component module

An electronic component module is provided that includes a substrate, an electronic component, a heat dissipating member, and a sealing resin. The electronic component is mounted on the substrate. The heat dissipating member includes a flat plate and columnar bodies. The sealing resin covers a side of a first main surface of the substrate and the electronic component. Moreover, the heat dissipating member, except for a top surface of the flat plate, is covered with the sealing resin. The columnar bodies are disposed at an outer peripheral of the flat plate, and have a shape protruding from a bottom surface of the flat plate. The columnar bodies include a root connected to the flat plate, and a tip connected to the substrate. In a plan view of the electronic component module, the tip is not outside the root.

TECHNICAL FIELD

The present invention relates to an electronic component module including a heat generating component.

BACKGROUND

Patent Literatures 1 to 3 (identified below) disclose a heat dissipation structure of an IC mounted on a substrate. In the configuration of Patent Literatures 1 to 3, the IC is sealed with a sealing member or a resin. The configuration of the structured described in Patent Literatures 1 to 3 includes a heat dissipation plate that dissipates heat from the IC.

More particularly, Patent Literature 1 discloses a configuration in which the heat dissipation plate is in contact with a top surface of the IC, and a portion of an outer periphery of the heat dissipation plate is curved toward the substrate and bonded to the substrate. Patent Literature 2 discloses a configuration in which the heat dissipation plate is disposed to face the top surface of the IC through a sealing member. Patent Literature 3 discloses a configuration in which the heat dissipation plate is adhered to the top surface of the IC by an adhesive agent. In the configuration of Patent Literatures 1 to 3, the top surface (i.e., a surface opposite to the IC) of the heat dissipation plate is exposed to the outside of a sealing resin.

However, in the configuration disclosed in Patent Literatures 1 to 3, the heat dissipation plate and the sealing resin may be separated due to a difference in linear expansion coefficients between the heat dissipation plate and the sealing resin. As a result, a gap is generated between the heat dissipation plate and the sealing resin, and thus reliability is reduced.

SUMMARY OF THE INVENTION

In view of the above, exemplary embodiments of the present invention are provided to significantly reduce or prevent generation of a gap between a heat dissipation plate and a sealing resin and to also improve reliability.

Accordingly, an electronic component module of the present invention is provided that includes a substrate, a first electronic component, a heat dissipating member, and a first sealing resin. The substrate includes a first main surface and a second main surface that face each other. The first electronic component is mounted on the first main surface of the substrate, and is a heat generating component. Moreover, the heat dissipating member is disposed so as to overlap the first electronic component in a plan view of the first main surface of the substrate. The first sealing resin is disposed near the first main surface of the substrate, covers the first main surface and the first electronic component, and includes a portion in contact with the heat dissipating member.

Moreover, in an exemplary aspect, the heat dissipating member includes a main body portion and an auxiliary portion. The main body portion is disposed opposite to the substrate with respect to the first electronic component. The auxiliary portion is connected to the outer peripheral portion of the main body portion and protrudes from the main body portion toward the substrate. In addition, the auxiliary portion includes a root portion connected to the main body portion, and a tip portion on an opposite side of the root portion. At least a portion of the tip portion of the auxiliary portion is connected to the substrate. Furthermore, the auxiliary portion, in a plan view of the main body portion, tilts so that a position of at least a portion of the tip portion is more inside the main body portion than a position of the root portion.

With this configuration, contraction of the main body portion is significantly reduced or prevented by the auxiliary portion. As a result, separation of an adhesive surface between the heat dissipating member and the first sealing resin is significantly reduced or prevented.

According to the exemplary embodiment of the present invention, generation of a gap between a heat dissipation plate and a sealing resin is significantly reduced or prevented, and reliability is improved.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

First Exemplary Embodiment

An electronic component module according to a first exemplary embodiment will be described with reference to drawings.FIG.1Ais a side cross-sectional view showing a configuration of an electronic component module according to the first exemplary embodiment.FIG.1Bis a side cross-sectional view of the electronic component module according to the first exemplary embodiment from which a sealing resin and a shield member are omitted.FIG.1Cis a plan view of the electronic component module according to the first exemplary embodiment from which the shield member is omitted.

As shown inFIG.1A,FIG.1B, andFIG.1C, an electronic component module10includes a substrate20, an electronic component31, a plurality of electronic components32, a heat dissipating member40, a sealing resin50, and a shield member60. For purposes of this disclosure, the electronic component31corresponds to a “first electronic component”, and the electronic component32corresponds to a “second electronic component”. Moreover, the sealing resin50corresponds to a “first sealing resin”. It is noted that the number of electronic components31and electronic components32is not limited to what is shown in the present exemplary embodiment.

As shown, the substrate20includes a first main surface21, a second main surface22, and a side surface. A main body of the substrate20is an insulator. Moreover, a predetermined electrode pattern is provided on the insulator. The first main surface21and the second main surface22face (i.e., oppose) each other. The substrate20, although being a ceramic substrate, may be a resin substrate in another exemplary aspect. In addition, the substrate20may be a multilayer substrate. The substrate20includes a plurality of electronic component electrodes231, a plurality of electronic component electrodes232, a plurality of heat dissipating member electrodes240, and a plurality of external connection electrodes250. The plurality of electronic component electrodes231, the plurality of electronic component electrodes232, and the plurality of heat dissipating member electrodes240are provided on the first main surface21. The plurality of external connection electrodes250are provided on the second main surface22. The plurality of electronic component electrodes231, the plurality of electronic component electrodes232, the plurality of heat dissipating member electrodes240, and the plurality of external connection electrodes250are connected by an electrode pattern provided on the substrate20. In such a case, the electrode pattern is provided so that a circuit configuration of the electronic component module10may be achieved. The plurality of electronic component electrodes231are disposed inside an area surrounded by the plurality of heat dissipating member electrodes240. The plurality of electronic component electrodes232are disposed outside the area surrounded by the plurality of heat dissipating member electrodes240.

According to an exemplary aspect, the electronic component31is a heat generating component having a high heat generation property. For example, the electronic component31may be an IC using a semiconductor substrate, or an elastic wave filter using a piezoelectric substrate. The electronic component31has a flat plate shape, for example, and includes a mounting surface, and a top surface opposite to the mounting surface. A function portion of the electronic component31is provided near the mounting surface. The electronic component is mounted on the plurality of electronic component electrodes231by use of using solder or the like.

Moreover, a plurality of electronic components32are electronic components having a low heat generation property, as compared with the electronic component31. For example, the electronic component32can be a chip-type mounted component such as a resistance element, an inductor element, and/or a capacitor element. The electronic component32is mounted on the plurality of electronic component electrodes232by use of solder or the like.

The heat dissipating member40includes a flat plate portion41(or simply referred to as a flat plate) and a plurality of columnar bodies42. The flat plate portion41corresponds to a “main body portion” or “main body” of the present disclosure, and the columnar body42corresponds to the “auxiliary portion” of the present disclosure. In an exemplary aspect, the heat dissipating member40is made of a material with high thermal conductivity, and made of copper (Cu), for example. The flat plate portion41and the plurality of columnar bodies42are integrally formed.

The flat plate portion41, in a plan view of the first main surface21and the second main surface22of the substrate20, overlaps the electronic component31, and does not overlap the plurality of electronic components32. The flat plate portion41includes a top surface411and a bottom surface412. The bottom surface412is adjacent to a top surface of the electronic component31and is disposed substantially parallel to the top surface.

The plurality of columnar bodies42have a shape protruding from the bottom surface412(e.g., a flat plate surface) of the flat plate portion41. The plurality of columnar bodies42are disposed with a distance along an outer periphery of the flat plate portion41. The plurality of columnar bodies are mounted on the plurality of heat dissipating member electrodes240by use of a bonding material490, for example.

According to this configuration, the top surface and side surface of the electronic component31are surrounded by the heat dissipating member40. In such a case, the top surface of the electronic component31and the flat plate portion41of the heat dissipating member40are opposed to each other over a predetermined area, and adjacent to each other. Therefore, heat generated in the electronic component31is efficiently propagated to the flat plate portion41of the heat dissipating member40. It is noted that a more specific shape of the heat dissipating member40will be described later.

In the exemplary aspect, the sealing resin50is made of an insulating resin. The sealing resin50covers a side of the first main surface21of the substrate20. More specifically, the sealing resin50covers the first main surface21of the substrate20, the electronic component31, and the plurality of electronic components32.

Furthermore, the sealing resin50covers a portion of the heat dissipating member40except for the top surface. More specifically, the sealing resin50covers a side surface and bottom surface of the flat plate portion41of the heat dissipating member40, and the auxiliary portion (i.e., the plurality of columnar bodies42). Then, the top surface of the sealing resin50and the top surface of the flat plate portion41are flush with each other.

Herein, as described above, the heat dissipating member40includes a configuration in which the plurality of columnar bodies42are disposed with a distance. As a result, the sealing resin50easily enters from the outside to inside of the heat dissipating member40. Therefore, a shape to cover the electronic component31is easily achieved by the sealing resin50, and the sealing resin50also easily enters in between the electronic component31and the flat plate portion41. As a result, the reliability of the electronic component module10is improved. Furthermore, the heat from the electronic component31to the flat plate portion41of the heat dissipating member40is efficiently propagated.

Moreover, according to the exemplary aspect, the shield member60is made of a film having conductivity. The shield member60is a metal film, for example, and is made of a material that blocks electromagnetic waves. It is noted that the shield member60, although being able to be omitted, is preferably provided.

The shield member60contacts the top surface of the sealing resin50, and the top surface411of the flat plate portion41. In addition, the shield member60contacts the side surface of the sealing resin50, and the side surface of the substrate20. In other words, the shield member60covers the side of the first main surface21of the substrate20in the electronic component module10, and the side surface of the substrate20.

With such a configuration, the electronic component module10efficiently propagates heat generated by the electronic component31, to the heat dissipating member40, and thus dissipates the heat of the electronic component31. In such a case, the top surface of the flat plate portion41is exposed to the outside of the sealing resin50. As a result, the heat propagated to the flat plate portion41is propagated to the outside of the sealing resin50, and is then dissipated.

Furthermore, the top surface411of the flat plate portion41is surface-connected to the shield member60. As a result, the shield member60is also configured for heat dissipation. Therefore, the heat propagated to the flat plate portion41is further more effectively dissipated.

In addition, the plurality of columnar bodies42of the heat dissipating member40are mounted on the substrate20. As a result, the heat is also propagated to the substrate20through the plurality of columnar bodies42and is dissipated. Therefore, the heat dissipation property of the electronic component module10is further improved.

While having the above high heat dissipation property, the electronic component module10also has high reliability according to the structure of the heat dissipating member40that is specifically shown below.

Configuration of Heat Dissipating Member40

FIG.2Ais a plan view of the heat dissipating member according to the first exemplary embodiment, andFIG.2Bis a first side view of the heat dissipating member.FIG.2Cis a second side view of the heat dissipating member, andFIG.2Dis an A-A cross-sectional view of the heat dissipating member.FIG.2Eis an enlarged plan view showing a portion of the heat dissipating member.FIG.3is an enlarged view of a bonded portion between the heat dissipating member and a substrate.

As described usingFIG.1AtoFIG.1C, and shown inFIG.2AtoFIG.2E, the heat dissipating member40includes a flat plate portion41and a plurality of columnar bodies42. The flat plate portion41and the plurality of columnar bodies42are integrally formed.

The flat plate portion41includes a top surface411, the bottom surface412, and the side surface413. The flat plate portion41has a rectangular shape in a plan view. An area of the flat plate portion41, that is, an area of the top surface411and the bottom surface412, is larger than an area of the electronic component31in a plan view.

The plurality of columnar bodies42are substantially circular cylinders in the exemplary embodiment. The plurality of columnar bodies42are connected to the bottom surface412of the flat plate portion41. The plurality of columnar bodies42each have a root portion421(or simply referred to as a root) and a tip portion422(or simply referred to as a tip). The root portion421is a portion at which the columnar body42is connected to the bottom surface412of the flat plate portion41. The tip portion422, in a direction in which the columnar body42extends, is an end portion opposite to the root portion421.

The plurality of columnar bodies42are disposed at the outer peripheral portion410of the flat plate portion41. The outer peripheral portion410is a frame-shaped portion with a constant width along an outer periphery. The width of the outer peripheral portion410is larger than a width (i.e., a diameter) of the columnar body42, for example, and is a size in which the electronic component31is accommodated in an area surrounded by the outer peripheral portion410in a plan view.

The plurality of columnar bodies42are disposed with a distance P42along the outer periphery of the flat plate portion41. For example, as shown inFIG.2AtoFIG.2E, the plurality of columnar bodies42are disposed at four corner portions of the flat plate portion41, and are also disposed with the distance P42along a side that connects each corner portion.

Furthermore, as shown inFIG.2AtoFIG.2E, the plurality of columnar bodies42are disposed in a shape tilted inside, in a plan view (i.e., in a plan view of the flat plate portion41) of the heat dissipating member40. In other words, in the plurality of columnar bodies42, the position of the tip portion422is closer to the center than the outer periphery of the flat plate portion41, with respect to the position of the root portion421. In other words, in a plan view of the flat plate portion41of the heat dissipating member40, the position of the tip portion422is not more outside than the position of the root portion421and the tip portions422tilt inwards.

According to such a configuration, the plurality of columnar bodies42significantly reduce or prevent deformation (e.g., contraction due to thermal history, for example) of the flat plate portion41in a direction parallel to the top surface411and the bottom surface412. In other words, the plurality of columnar bodies42have an anchor effect against the deformation of the flat plate portion41in the direction parallel to the top surface411and the bottom surface412.

Therefore, even when the thermal history is applied while the sealing resin50is in contact with the side surface413of the flat plate portion41, the deformation of the flat plate portion41is significantly reduced or prevented, and separation on a contact surface with the sealing resin50is significantly reduced or prevented. As a result, the electronic component module10achieves high reliability. However, it is noted that while in the present embodiment, all the columnar bodies are formed so as to be tilted to the inside, at least one columnar body may be tilted to the inside in a refinement of the exemplary embodiment.

It is also noted that, in a plan view, the position of the tip portion422may overlap the position of the root portion421. In other words, the direction in which the columnar body42extends may be perpendicular to the bottom surface412of the flat plate portion41. However, as described above, the plurality of columnar bodies42have a shape tilted to the inside of the flat plate portion41, so that the anchor effect is better produced and is more suitable. In addition, the plurality of columnar bodies42may have a mixture of a configuration that tilts inside and a configuration that is perpendicular to the bottom surface412.

Furthermore, the plurality of columnar bodies42are bonded to the substrate20. As a result, the anchor effect against the deformation of the flat plate portion41by the plurality of columnar bodies42is improved. Therefore, the reliability of the electronic component module10is further improved.

In addition, the width (i.e., the diameter) W42of the plurality of columnar bodies42is preferably larger than the thickness D41of the flat plate portion41. As a result, the anchor effect against the deformation of the flat plate portion41by the plurality of columnar bodies42is improved. Therefore, the reliability of the electronic component module10is further improved. In addition, the length of the plurality of columnar bodies42is preferably larger than the thickness D41of the flat plate portion41. As a result, the anchor effect against the deformation of the flat plate portion41by the plurality of columnar bodies42is improved. Therefore, the reliability of the electronic component module10is further improved. Then, as with the above, by reducing the thickness D41of the flat plate portion41, the height of the electronic component module10is reduced. In other words, this configuration achieves a low-profile electronic component module10.

In addition, the distance P42between adjacent columnar bodies42is preferably less than or equal to half (½) a wavelength of electromagnetic wave noise generated from the electronic component31, for example. In the exemplary aspect, the plurality of columnar bodies42are made of metal, so that this configuration is able to significantly reduce or prevent the electromagnetic wave noise generated by the electronic component31from affecting other components or the outside. In addition, the distance P42, for example, is preferably less than or equal to half (½) a wavelength of electromagnetic wave noise from the outside that affects the electronic component31. With this configuration, the influence of the electromagnetic wave noise from the outside to the electronic component31is significantly reduced or prevented.

In addition, as shown inFIG.2AtoFIG.2EandFIG.3, the tip portion422of the plurality of columnar bodies42has a tapered shape4220. As a result, as shown inFIG.3, between the heat dissipating member electrode240and the tip portion422of the columnar body42, a central area with a small gap height and a peripheral area that surrounds the central area and has the height of a gap that is increased gradually toward the outside, are provided.

According to such a configuration, the bonding material490(e.g., as shown inFIG.3) easily flows in between the heat dissipating member electrode240and the tip portion422. Therefore, it is unlikely that a void generated inside the bonding material490between the tip portion422and the heat dissipating member electrode240. As a result, the reliability of bonding between the heat dissipating member40and the heat dissipating member electrode240is improved, and then the reliability of the electronic component module10is improved.

In addition, in the above configuration, the heat dissipating member40, as one type of mounted components, is mounted on the substrate20with the electronic component31and the electronic component32. As a result, the heat dissipating member40is positioned and mounted with high accuracy with respect to the electronic component31.

It is noted that a specific manufacturing method of the electronic component module10is as follows, for example. First, the electronic component31and the electronic component32are attached to the substrate20by use of cream solder or the like. Subsequently, the heat dissipating member40is attached to the substrate20by use of cream solder or the like. Then, the substrate20to which the electronic component31, the electronic component32, and the heat dissipating member40are attached is subjected to a reflow treatment. As a result, the electronic component31, the electronic component32, and the heat dissipating member40are bonded (e.g., mounted) to the substrate20.

Then, after a cleaning process or the like, the sealing resin50is applied to a side of the first main surface21of the substrate20, and the sealing resin50is cured. Subsequently, the sealing resin50is ground from the top surface to expose the flat plate portion41of the heat dissipating member40. In such a case, a portion of the flat plate portion41may be ground. Accordingly, the flat plate portion41is able to be formed to be thin. Subsequently, the shield member60is provided so as to cover the flat plate portion41, the sealing resin50, and the side surface of the substrate20.

Derived Example of Heat Dissipating Member

FIG.4A,FIG.4B, andFIG.4Care views each showing a derived example of the heat dissipating member. The basic configuration of each heat dissipating member is the same as the configuration of the heat dissipating member40, and, hereinafter, only differences from the heat dissipating member40will be described.

A heat dissipating member40XA shown inFIG.4Aincludes a flat plate portion41and a plurality of columnar bodies42A. In this exemplary aspect, the plurality of columnar bodies42A are elliptical columns. In other words, a cross-section of the plurality of columnar bodies42A has an elliptical shape. The major axis of a columnar body42A is parallel to a direction from the outside to the center of the flat plate portion41. The minor axis of the columnar body42A is perpendicular to the major axis, and thus is perpendicular to the direction from the outside to the center of the flat plate portion41.

According to such a configuration, the plurality of columnar bodies42A, that is, the auxiliary portion has a large cross-sectional area. As a result, the deformation of the flat plate portion41is significantly reduced or prevented, and the reliability of the electronic component module10is improved. Furthermore, with this configuration, a reduction in the distance between adjacent columnar bodies42is significantly reduced or prevented. Therefore, the sealing resin50is significantly reduced or prevented from being difficult to enter the periphery of the electronic component31.

A heat dissipating member40XB shown inFIG.4Bincludes a flat plate portion41, a plurality of columnar bodies42B1, and a plurality of columnar bodies42B2. The shape of the plurality of columnar bodies42B1is the same as the shape of the plurality of columnar bodies42. The arrangement pattern of the plurality of columnar bodies42B1is the same as the arrangement pattern of the plurality of columnar bodies42. The shape of the plurality of columnar bodies42B2is the same as the shape of the plurality of columnar bodies42. The plurality of columnar bodies42B2are disposed closer to the center than the plurality of columnar bodies42B1with respect to the flat plate portion41. At this time, the plurality of columnar bodies42B are also disposed with a distance along the outer periphery of the flat plate portion41. In other words, the plurality of columnar bodies42B1and the plurality of columnar bodies42B2are disposed in two rows (e.g., two or more rows). Furthermore, the plurality of columnar bodies42B2are disposed not to completely overlap the plurality of columnar bodies42B1, in a side view of the heat dissipating member40XB in a direction perpendicular to each side. In other words, the plurality of columnar bodies42B1and the plurality of columnar bodies42B2are arranged in a so-called staggered manner.

According to such a configuration, the auxiliary portion configured by the plurality of columnar bodies42B1and the plurality of columnar bodies42B2has a large cross-sectional area. As a result, the deformation of the flat plate portion41is significantly reduced or prevented, and the reliability of the electronic component module10is improved. Furthermore, with this configuration, a reduction in the distance between adjacent columnar bodies42B1and the distance between adjacent columnar bodies42B2is significantly reduced or prevented. Therefore, the sealing resin50is significantly reduced or prevented from being difficult to enter the periphery of the electronic component31.

A heat dissipating member40XC shown inFIG.4Cincludes a flat plate portion41, a plurality of columnar bodies42C1, and a plurality of columnar bodies42C2. The shape of the plurality of columnar bodies42C1is the same as the shape of the plurality of columnar bodies42. The shape of the plurality of columnar bodies42C2is the same as the shape of the plurality of columnar bodies42, except for a cross-sectional area. The cross-sectional area of the plurality of columnar bodies42C2is larger than the cross-sectional area of the plurality of columnar bodies42C1. The plurality of columnar bodies42C1and the plurality of columnar bodies42C2are arranged in a predetermined pattern, for example, in the staggered pattern as described above. In such a case, a distance between adjacent columnar bodies in the plurality of columnar bodies42C1and the plurality of columnar bodies42C2, as described above, is set to such an extent that a significant reduction in a flow of the sealing resin50does not occur.

According to such a configuration, the auxiliary portion configured by the plurality of columnar bodies42C1and the plurality of columnar bodies42C2has a large cross-sectional area. As a result, the deformation of the flat plate portion41is significantly reduced or prevented, and the reliability of the electronic component module10is improved. Furthermore, with this configuration, a reduction in the distance between adjacent columnar bodies42C1and the distance between adjacent columnar bodies42C2is significantly reduced or prevented. Therefore, the sealing resin50is significantly reduced or prevented from being difficult to enter the periphery of the electronic component31.

It is noted that the derived configurations can also be appropriately combined. In addition, a cross-section of a columnar body may be a polygonal shape such as a rectangle or columnar bodies having a plurality of types of cross-sectional shapes may be mixed. In addition, the arrangement position and the distance of the columnar bodies, although being shown in a regularly symmetrical state in the figure, may be in an asymmetrical state in which the arrangement position and the distance are changed, depending on places.

Second Exemplary Embodiment

An electronic component module according to a second exemplary embodiment will be described with reference to drawings.FIG.5is a side cross-sectional view showing a configuration of the electronic component module according to the second exemplary embodiment.FIG.6Ais a plan view of a heat dissipating member according to the second exemplary embodiment,FIG.6Bis a first side view of the heat dissipating member, andFIG.6Cis a second side view of the heat dissipating member.

As shown inFIG.5,FIG.6A,FIG.6B, andFIG.6C, an electronic component module10A according to the second exemplary embodiment is different in a configuration of a heat dissipating member40A from the electronic component module10according to the first exemplary embodiment. Other configurations of the electronic component module10A are the same as or similar to the configurations of the electronic component module10, and a description of the same or similar configuration will be omitted.

The electronic component module10A includes a heat dissipating member40A that includes a flat plate portion41and a plurality of columnar bodies42. A plurality of concave portions401are provided on the bottom surface412of the flat plate portion41. The plurality of concave portions401are provided in a grid shape with respect to the bottom surface412.

The sealing resin50also enters the concave portion401while contacting the bottom surface412. As a result, a bonded area between the sealing resin50and the flat plate portion41is increased, and the bonding strength between the sealing resin50and the flat plate portion41is increased. Therefore, the deformation of the flat plate portion41is further reduced or prevented, and the reliability of the electronic component module10A is further improved.

Third Exemplary Embodiment

An electronic component module according to a third exemplary embodiment of the present invention will be described with reference to drawings.FIG.7is a side view showing a configuration of a heat dissipating member according to the third exemplary embodiment.

As shown inFIG.7, an electronic component module according to the third exemplary embodiment is different in a shape of a heat dissipating member40B from the electronic component module10according to the first exemplary embodiment. Other configurations of the electronic component module according to the third exemplary embodiment are the same as or similar to the configurations of the electronic component module10, and a description of the same or similar configuration will be omitted.

The heat dissipating member40B includes a flat plate portion41and a plurality of columnar bodies42B. A cross-sectional area of a root portion421B of a columnar body42B is larger than a cross-sectional area of other portions of the columnar body42B. According to this configuration, a bonded area between the columnar body42B and the flat plate portion41is increased.

In a case in which the flat plate portion41deforms, the columnar body42B receives the most stress in the root portion421B bonded to the flat plate portion41. However, with this configuration, the heat dissipating member40B increases strength against the stress. Therefore, the reliability against breakage of the heat dissipating member40B is improved, and the reliability of an electronic component module is improved.

Furthermore, in this configuration, a cross-sectional area of a portion into which the sealing resin50mainly flows, that is, a portion other than the root portion421B in the columnar body42B, is not increased. Therefore, the sealing resin50easily enters the periphery of the electronic component31.

Fourth Exemplary Embodiment

An electronic component module according to a fourth exemplary embodiment will be described with reference to drawings.FIG.8is a side cross-sectional view showing a configuration of the electronic component module according to the fourth exemplary embodiment.FIG.9Ais a plan view of a heat dissipating member according to the fourth exemplary embodiment,FIG.9Bis a first side view of the heat dissipating member, andFIG.9Cis a second side view of the heat dissipating member.

As shown inFIG.8,FIG.9A,FIG.9B, andFIG.9C, an electronic component module10C according to the fourth exemplary embodiment is different in a configuration of a heat dissipating member40C from the electronic component module10according to the first exemplary embodiment. Other configurations of the electronic component module10C are the same as or similar to the configurations of the electronic component module10, and a description of the same or similar configuration will be omitted.

The electronic component module10C includes a heat dissipating member40C. The heat dissipating member40C includes a flat plate portion41, a plurality of columnar bodies42, and a plurality of columnar bodies43. The plurality of columnar bodies42and the plurality of columnar bodies43configure the “auxiliary portion” of the present disclosure.

The plurality of columnar bodies42are disposed at corner portions of the flat plate portion41. The plurality of columnar bodies42correspond to a “first columnar body” of the present disclosure. The plurality of columnar bodies42are bonded to the heat dissipating member electrode240by use of the bonding material490.

Moreover, the plurality of columnar bodies43are disposed along a side of the flat plate portion41, and are disposed between the plurality of columnar bodies42. The plurality of columnar bodies43correspond to a “second columnar body” of the present disclosure. A length of the plurality of columnar bodies43is smaller than a length of the plurality of columnar bodies42. In this configuration, the plurality of columnar bodies43are disposed only up to an intermediate position in a thickness direction of the electronic component31. Therefore, when the electronic component module10C is viewed in a direction perpendicular to each side, the plurality of columnar bodies43do not overlap a portion on a side of the mounting surface in the electronic component31. Therefore, the sealing resin50more easily enters the periphery of the electronic component31.

Fifth Exemplary Embodiment

An electronic component module according to a fifth exemplary embodiment of the present invention will be described with reference to drawings.FIG.10Ais a plan view of a heat dissipating member according to the fifth exemplary embodiment,FIG.10Bis a first side view of the heat dissipating member, andFIG.10Cis a second side view of the heat dissipating member.

As shown inFIG.10A,FIG.10B, andFIG.10C, an electronic component module according to the fifth exemplary embodiment is different in a configuration of a heat dissipating member40D from the electronic component module10according to the first exemplary embodiment. Other configurations of the electronic component module according to the fifth exemplary embodiment are the same as or similar to the configurations of the electronic component module10, and a description of the same or similar configuration will be omitted.

The heat dissipating member40D includes a flat plate portion41, a plurality of columnar bodies42, and a frame body44. The plurality of columnar bodies42and the frame body44configure the “auxiliary portion” of the present disclosure.

As shown, the plurality of columnar bodies42are disposed at corner portions of the flat plate portion41. The plurality of columnar bodies42are bonded to the heat dissipating member electrode240by use of the bonding material490.

The frame body44is disposed so as to extend along a side of the flat plate portion41. The frame body44is connected to each of the plurality of columnar bodies42. A height (i.e., a length in a direction perpendicular to the bottom surface412of the flat plate portion41) of the frame body44is smaller than the length of the plurality of columnar bodies42. In this configuration, the frame body44is disposed only up to an intermediate position in the thickness direction of the electronic component31. Therefore, when the electronic component module10C is viewed in a direction perpendicular to each side, the frame body44does not overlap a portion on a side of the mounting surface in the electronic component31. Therefore, the sealing resin50more easily enters the periphery of the electronic component31.

In this manner, the auxiliary portion is not limited to a columnar body and may also include a frame body.

Sixth Exemplary Embodiment

An electronic component module according to a sixth exemplary embodiment of the present invention will be described with reference to drawings.FIG.11is a side cross-sectional view showing a configuration of an electronic component module10E according to the sixth exemplary embodiment of the present invention.

As shown inFIG.11, the electronic component module10E according to the sixth exemplary embodiment is different from the electronic component module10according to the first exemplary embodiment in that a substrate20is double-sided mounted. A description of a same portion in the electronic component module10E as the portion of the electronic component module10will be omitted.

The electronic component module10E includes a substrate20, an electronic component31, a plurality of electronic components32, a heat dissipating member40, a sealing resin51, a sealing resin52, a shield member60E, and a plurality of post conductors70. The plurality of electronic components32in the present exemplary embodiment correspond to a “third electronic component” of the present disclosure, the sealing resin51corresponds to a “first sealing resin” of the present disclosure, and the sealing resin52corresponds to a “second sealing resin” of the present disclosure.

The electronic component31is mounted on the first main surface21of the substrate20. The plurality of electronic components32are mounted on the second main surface22of the substrate20. The heat dissipating member40is mounted on the first main surface21of the substrate20. The flat plate portion41of the heat dissipating member40is close to the electronic component31. The plurality of post conductors70are disposed near the first main surface21of the substrate20, and are connected to an electrode pattern of the substrate20.

The sealing resin51covers a side of the first main surface21of the substrate20. The sealing resin51covers the electronic component31, the heat dissipating member40, and the post conductor70. However, a main surface of the flat plate portion41of the heat dissipating member40opposite to the electronic component31, and the end surface of the plurality of post conductors70opposite to a connection portion to the substrate20are exposed from the sealing resin51to the outside.

The sealing resin52covers a side of the second main surface22of the substrate20. Moreover, the sealing resin52covers the plurality of electronic components32.

A shield member60E covers a side surface of the substrate20, the sealing resin51, and the sealing resin52. In such a case, the shield member60E does not cover an externally exposed surface of the flat plate portion41of the heat dissipating member40or an externally exposed surface of the post conductor70.

The electronic component module10E of such a configuration is mounted on an external circuit board90. The external circuit board90includes an electrode91and a plurality of electrodes92. The flat plate portion41of the heat dissipating member40in the electronic component module10E is bonded to the electrode91by use of a bonding material900. The plurality of post conductors70are bonded to the plurality of electrodes92by use of the bonding material900.

In such a manner, a shape of the heat dissipating member is also applicable to the double-sided mounting type electronic component module10E. Then, in this configuration, heat generated by the electronic component31and propagated to the heat dissipating member40is propagated to the external circuit board90. As a result, the heat dissipation property of the electronic component module10E is improved.

A modification of the sixth preferred embodiment may be shown inFIG.12andFIG.13.FIG.12andFIG.13are side cross-sectional views showing a configuration of a modification of the electronic component module according to the sixth exemplary embodiment. It is noted that a shield member60F of an electronic component module10F and a shield member60G of an electronic component module10G have the same configuration as the shield member60E of the electronic component module10E.

As shown inFIG.12, in the electronic component module10F, the electronic components31and the heat dissipating member40are disposed near the first main surface of the substrate20, and the plurality of electronic components32are disposed on the second main surface22of the substrate20. The plurality of post conductors70are disposed near the second main surface22of the substrate20. In other words, the second main surface of the substrate20is a mounting surface to the external circuit board90, for example. In addition, as shown inFIG.13, in the electronic component module10G, the electronic component31and the heat dissipating member are disposed on both surfaces of the substrate20, respectively.

It is also that the cross-sectional shape of the columnar body configuring the auxiliary portion is not limited to an ellipse. The columnar body configuring the auxiliary portion may have a prism-like shape, a plate-like shape, or any other suitable shape, for example. In addition, the configurations of the above-described exemplary embodiments are able to be appropriately combined, and the advantageous functions and effects according to each combination are able to be obtained.

REFERENCE SIGNS LIST