JP2015012250A - Module and portable device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a module capable of efficiently releasing heat of a heating component to a motherboard when the module is accommodated within a housing and disposed proximately to one wall surface of the housing while being packaged on the motherboard.SOLUTION: A second resin layer 15 formed from a resin material of which the heat conductivity is lower than that of a resin material of a first resin layer 14 is disposed more approximately to one wall surface 2a of a housing 2 than the first resin layer 14. Therefore, when a module 10 is accommodated within the housing 2 and disposed proximately to the one wall surface 2a of the housing 2 while being packaged on a motherboard 3, heat of a heating member such as an IC 2 is transferred in a direction away from the one wall surface 2a of the housing 2 within the module 10. Thus, heat of the heating component can be prevented from being radiated from the module 10 closer to the one wall surface 2a of the housing 2, and heat of the heating component can be efficiently released to the motherboard 3.

Description

  The present invention relates to a module that is housed in a housing in a state of being mounted on a motherboard and is disposed in the vicinity of one wall surface of the housing, and a portable device including the module.

  As shown in FIG. 9, a resin layer 503 is formed by sealing a whole including an outer lead 502 of a heat generating component 501 such as a package IC mounted on a substrate 500 with a resin material having good thermal conductivity. The heat generated from the heat generating component 501 included in the module is radiated (for example, Patent Document 1). That is, the module is cooled by the heat of the heat generating component 501 being diffused throughout the resin layer 503 and soaking. Further, the cooling efficiency of the module is improved by the cooling fins 504 formed in the resin layer 503. In addition, FIG. 9 is a figure which shows the module provided with the conventional heat-emitting component.

Japanese Patent Laid-Open No. 8-204669 (paragraphs 0009, 0010, FIG. 1, abstract, etc.)

  As described above, the module is housed in the casing of the portable device in a state where the entire heat generating component 501 including the outer lead 502 is covered with the resin layer 503. However, in recent years, portable devices such as mobile phones, tablets, portable music players, digital cameras, car navigation systems, and the like have been rapidly reduced in size and thickness, and the following problems may occur. In other words, a module including the heat generating component 501 is disposed adjacent to one wall surface of a casing of a portable device that has been reduced in size and thickness. Therefore, the casing becomes hot due to the radiant heat of the heat-generating component 501 from the surface of the resin layer 503, and the casing cannot be directly held by hand, and may not be used as a portable device.

  The present invention has been made in view of the above-described problems, and when the heat sink is mounted on the motherboard and stored in the casing and disposed close to one wall surface of the casing, the heat of the heat-generating component is transferred to the motherboard. An object of the present invention is to provide a module that can be efficiently released and to provide a portable device including the module.

  In order to achieve the above-described object, a module of the present invention is a module that is housed in a housing in a state of being mounted on a motherboard, and is disposed close to one wall surface of the housing. A heat generating component mounted on one main surface, a first resin layer formed by coating the one main surface of the main substrate and the heat generating component with a resin material, and a resin material of the first resin layer And a second resin layer made of a resin material having a low thermal conductivity, and the second resin layer is disposed closer to the one wall surface of the housing than the first resin layer. It is characterized by.

  In the invention configured as described above, the heat generating component is mounted on one main surface of the main substrate, and the first resin layer is formed by covering the one main surface of the main substrate and the heat generating component with the resin material. In addition, a second resin layer made of a resin material having a lower thermal conductivity than the resin material of the first resin layer is disposed closer to one wall surface of the housing than the first resin layer. Therefore, when the module is mounted on the motherboard and stored in the housing and placed close to one wall surface of the housing, the thermal conductivity in the module increases as the distance from the wall surface of the housing increases. As shown, a gradient occurs in the distribution of thermal conductivity in the module. Accordingly, the heat of the heat generating component is transferred in the direction away from the one wall surface of the housing in the module, so that the heat of the heat generating component can be suppressed from being radiated from the one wall surface side of the module housing. The heat of the components can be efficiently released to the motherboard.

  The main board may be disposed on the mother board side, and the second resin layer may cover the first resin layer.

  If comprised in this way, the heat | fever of the heat-emitting component coat | covered with the 1st resin layer will be heat-transferred to the main board | substrate arrange | positioned on the opposite side to the 2nd resin layer. Therefore, since the main board is arranged on the mother board side, the heat of the heat generating component can be released to the mother board more efficiently.

  Further, another component mounted on the other main surface of the main substrate, and a third component formed by coating the other main surface of the main substrate and the other component with the same resin material as the first resin layer. The resin layer and the third resin layer, one end is connected to the other main surface of the main substrate, and the other end is exposed on the surface of the third resin layer and connected to the motherboard The connection conductor may be further provided.

  In this way, other components are mounted on the other main surface of the main substrate, and the other main surface and other components of the main substrate are covered with the same resin material as the first resin layer to form the third resin layer. Has been. In addition, a columnar connection conductor is provided in the third resin layer, one end of the connection conductor is connected to the other main surface of the main substrate, and the other end of the connection conductor is exposed on the surface of the third resin layer to be connected to the motherboard. Connected. Accordingly, the heat of the heat generating component is transferred in the module in a direction away from the one wall surface of the housing, and the heat of the heat generating component can be more efficiently released to the mother board through the connection conductor connected to the mother board. Further, the mounting density of the module can be improved by mounting other components on the other main surface of the main board.

  The heat generating component may include a sub-board on which an active component and a passive component are mounted, and the sub-board and one main surface of the main board may be connected.

  With this configuration, the heat generating component formed by mounting the active component and the passive component on the sub-board is mounted on the one main surface of the main substrate, so that the module mounting density can be improved.

  In addition, at least one of the active component and the passive component includes a component mounted on a main surface of the sub-substrate facing the main surface of the main substrate and having a plurality of external terminals. One main surface of the main substrate may be connected via the external terminals.

  If comprised in this way, at least any one of an active component and a passive component contains what is mounted in the main surface facing the one main surface of the main board of a subboard | substrate, and has a some external terminal. It is possible to provide a module having a practical configuration in which the main surface of the main board is connected to one main surface of the main board via each external terminal.

  The first resin layer may be disposed on the mother board side, and the second resin layer may cover the other main surface of the main substrate.

  If comprised in this way, the heat | fever of the heat-emitting component coat | covered with the 1st resin layer will be heat-transferred to the surface side of the 1st resin layer on the opposite side to a 2nd resin layer. Therefore, since the first resin layer is disposed on the motherboard side, the heat of the heat generating component can be released to the motherboard side more efficiently.

  The heat generating component may include a semiconductor element for power control.

  In this way, it is possible to provide a power control module having a practical configuration that can efficiently release the heat of the power control semiconductor element to the mother board.

  According to another aspect of the present invention, there is provided a portable device comprising the module according to any one of claims 1 to 7, wherein the housing is the housing of the device.

  According to the invention configured as described above, it is possible to provide a portable device in which the heat of the module mounted on the mother board in the housing is released to the mother board, thereby preventing the housing from being heated by the heat of the module. .

  According to the present invention, the second resin layer made of a resin material having a lower thermal conductivity than the resin material of the first resin layer is disposed closer to one wall surface of the housing than the first resin layer. In this way, when the module is housed in the housing in a state where it is mounted on the mother board and placed close to one wall surface of the housing, the heat of the heat generating component is separated from the one wall surface of the housing in the module. Therefore, the heat of the heat generating component can be suppressed from being radiated from the one wall surface side of the module housing, and the heat of the heat generating component can be efficiently released to the motherboard.

It is a principal part enlarged view of a portable apparatus provided with the module concerning 1st Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 2nd Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 3rd Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 4th Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 5th Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 6th Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 7th Embodiment of this invention. It is a principal part enlarged view of a portable apparatus provided with the module concerning 8th Embodiment of this invention. It is a figure which shows the module provided with the conventional heat-emitting component.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an enlarged view of a main part of a portable device including a module according to the first embodiment of the present invention.

  As shown in FIG. 1, a portable device 1 such as a mobile phone, a tablet, a portable music player, a digital camera, or a car navigation system includes a housing 2 formed of resin or metal, a motherboard 3, and a module 10. The module 10 is housed in the housing 2 in a state of being mounted on the mother board 3, and is disposed close to the one wall surface 2 a in the housing 2. The mother board 3 is formed of a general substrate forming material such as a resin material such as a glass epoxy resin or a liquid crystal polymer, or a ceramic material.

  The module 10 includes a main substrate 11, an IC 12 including a semiconductor element such as a power control MOSFET (corresponding to “semiconductor element”, “heat generating component”, and “active component” of the present invention), a chip inductor, a chip capacitor, and a chip register. For example, the module 10 is configured as a switching regulator for supplying power to a portable device or charging a battery.

  The main substrate 11 is configured by a general substrate such as a resin substrate such as a glass epoxy resin or a liquid crystal polymer, a ceramic (LTCC) substrate, or a glass substrate. Depending on the intended use of the module 10, the main substrate 11 may be formed on either a single layer substrate or a multilayer substrate. Further, a mounting electrode 11c for mounting components such as the IC 12 and the chip component 13 is formed on one main surface 11a of the main substrate 11, and the module 10 is connected to the mother board 3 on the other main surface 11b. The connecting electrode 11d is formed. Each mounting electrode 11c and each connection electrode 11d are a wiring pattern (not shown) or via conductor (not shown) provided in the main substrate 11 by a conductive material containing Ag, Cu, Au, Al, or the like. ) Or the like.

  The IC 12 and the chip component 13 are surface-mounted on the one main surface 11a of the main substrate 11 using a general surface mounting technique using solder, ultrasonic vibration, or the like. Further, the first main surface 11a of the main substrate 11, the IC 12 and the chip component 13 are covered with a general molding resin such as an epoxy resin to form the first resin layer. A second resin layer 15 made of a resin material having a lower thermal conductivity than the resin material of the first resin layer 14 is formed so as to cover the first resin layer 14. Further, the main board 11 is disposed on the mother board 3 side, and the connection electrodes 11 d on the other main surface 11 b of the main board 11 are connected to the mother board 3, whereby the module 10 is mounted on the mother board 3. The second resin layer 15 is disposed closer to the one wall surface 2 a of the housing 2 than the first resin layer 14.

  As described above, in this embodiment, the IC 12 and the chip component 13 including the semiconductor element for power control are mounted on the one main surface 11a of the main substrate 11, and the one main surface 11a of the main substrate 11, the IC 12 and the chip component are mounted. 13 is covered with a resin material to form a first resin layer 14. In addition, the second resin layer 15 made of a resin material having a lower thermal conductivity than the resin material of the first resin layer 14 is disposed closer to the one wall surface 2a of the housing 2 than the first resin layer 14 is. Has been.

  Therefore, when the module 10 is mounted on the mother board 3 and stored in the housing 2 and disposed close to one wall surface 2a of the housing 2, the thermal conductivity in the module 10 is The distance increases as the distance from the wall surface 2a increases. That is, a gradient occurs in the thermal conductivity distribution in the module 10. Accordingly, since the heat of the IC 12 is transferred in the direction away from the one wall surface 2a of the housing 2 in the module 10, the heat of the IC 12 is suppressed from being radiated from the surface of the module 10 on the one wall surface 2a side. The heat of the IC 12 can be efficiently released to the mother board 3 via the main board 11.

  Further, the main substrate 11 is disposed on the mother board 3 side, and the first resin layer 14 is formed by a second resin layer 15 formed of a resin material having a lower thermal conductivity than the resin material of the first resin layer 14. It is covered. Therefore, the heat of the heat generating component such as the IC 12 covered with the first resin layer 14 is arranged on the side opposite to the second resin layer and is in contact with the main substrate 11 in contact with the first resin layer 14. Heat is transferred through the resin layer 14. Therefore, it is possible to efficiently suppress the heat of the heat generating component from being radiated from the surface of the second resin layer 15 on the side of the one wall surface 2a of the housing 2 of the module 10. Further, since the main board 11 is disposed on the mother board 3 side, the heat of the IC 12 can be released to the mother board 3 more efficiently.

  As described above, it is possible to provide the power control module 10 having a practical configuration capable of efficiently releasing the heat of the IC 12 including the power control semiconductor element to the mother board 3. Further, when the module 10 is configured for power control, a passive component that generates heat, such as a power inductor, may be mounted on the one main surface 11 a of the main substrate 11 as the chip component 13. In this case, the heat of the chip component 13 can be released to the mother board 3 as efficiently as the heat of the IC 12.

  Then, it is possible to provide the mobile device 1 in which the heat of the module 10 mounted on the mother board 3 in the housing 2 is released to the mother board 3, thereby preventing the housing 2 from being heated by the heat of the module 10. it can.

Second Embodiment
A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is an enlarged view of a main part of a portable device including a module according to the second embodiment of the present invention.

  The module 10a of this embodiment is different from the module 10 of FIG. 1 in that, as shown in FIG. 2, the mounting electrode 11c on the other main surface 11b of the main substrate 11 is a chip component as the “other component” of the present invention. 13 is further mounted. Hereinafter, differences from the above-described first embodiment will be described, and other configurations will be denoted by the same reference numerals, and description of the configurations will be omitted.

  In the module 10 a of FIG. 2, the other main surface 11 b of the main substrate 11 and each chip component 13 are covered with the same resin material as the first resin layer 14 to form a third resin layer 16. Note that an IC 12 (active component) that is a heat generating component may be further mounted on the other main surface 11b of the main substrate 11 as the “other component” of the present invention. Further, a chip component 13 (passive component) that generates heat, such as a power inductor, may be further mounted on the other main surface 11 b of the main substrate 11 as “another component” of the present invention.

  The third resin layer 16 is provided with columnar connection conductors 17. One end of the connection conductor 17 is connected to the mounting electrode 11 c on the other main surface 11 b of the main substrate 11, and the other end is exposed on the surface of the third resin layer 16 and formed on the surface of the third resin layer 16. It is connected to the connection electrode 11d. The connection electrode 11d is connected to the mother board 3. The connection conductor 17 is configured by mounting a metal pin such as Cu, Au, Ag, Al or the like on the mounting electrode 11 c on the other main surface 11 b of the main substrate 11, or formed on the third resin layer 16. The formed via hole is filled with a conductive paste containing Cu, Au, Ag, Al or the like, or is formed by performing via fill plating.

  As described above, in this embodiment, the same effects as those in the first embodiment described above can be obtained, and the following effects can be obtained. That is, the chip component 13 is mounted on the other main surface 11 b of the main substrate 11, and the other main surface 11 b of the main substrate 11 and each chip component 13 are covered with the same resin material as that of the first resin layer 14. Layer 16 is formed. Further, a columnar connection conductor 17 is provided on the third resin layer 16, one end of the connection conductor 17 is connected to the other main surface 11 b of the main substrate 11, and the other end of the connection conductor 17 is the third resin layer 16. It is exposed on the surface and connected to the mother board 3 through the connection electrode 11d.

  Therefore, the heat of the heat generating component such as the IC 12 is transferred in the module 10a in the direction away from the one wall surface 2a of the housing 2, and the heat of the heat generating component is more efficiently transmitted through the connection conductor 17 connected to the mother board 3. It can escape to the mother board 3. Further, by mounting other components such as the chip component 3 on the other main surface 11b of the main substrate 11, the mounting density of the module 10a can be improved.

<Third Embodiment>
A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is an enlarged view of a main part of a portable device including a module according to the third embodiment of the present invention.

  The module 10b of this embodiment is different from the module 10 of FIG. 1 in that the heat generating component 100 is mounted on the mounting electrode 11c on the one main surface 11a of the main substrate 11 as shown in FIG. . Hereinafter, differences from the above-described first embodiment will be described, and other configurations will be denoted by the same reference numerals, and description of the configurations will be omitted.

  The heat generating component 100 includes a sub-board 101 on which an IC 12 (active component) and a chip component 13 are mounted. Similar to the main substrate 11, the sub-substrate 101 is configured by a general substrate such as a resin substrate such as a glass epoxy resin or a liquid crystal polymer, a ceramic (LTCC) substrate, or a glass substrate. In addition, the sub-board 101 may be formed on either a single-layer board or a multi-layer board depending on the configuration of the heat generating component 100 required depending on the purpose of use of the module 10b. Further, on both main surfaces of the sub-board 101, mounting electrodes for surface mounting components such as the IC 12 and the chip component 13 by a general surface mounting technique using solder, ultrasonic vibration or the like are formed. Yes. The mounting electrodes formed on both main surfaces of the sub-board 101 are wiring patterns (not shown) or via conductors provided in the sub-board 101 with a conductive material containing Ag, Cu, Au, Al, or the like. It is electrically connected via (not shown) or the like.

  In addition, the mounting electrode formed on the main surface of the sub-board 101 facing the one main surface of the main substrate 11 and the mounting electrode 11 c formed on the one main surface 11 a of the main substrate 11 are connected by the connection conductor 17. By being connected, the sub-board 101 and the one main surface 11a of the main board 11 are connected.

  As described above, in this embodiment, the same effects as those in the first embodiment described above can be obtained, and the following effects can be obtained. That is, the mounting density of the module 10b can be improved by mounting the heat generating component 100 formed by mounting the IC 12 and the chip component 13 on the sub-board 100 on the one main surface 11a of the main board 11.

  Further, the heat of the heat generating component 100 including a heat generating element such as the IC 12 in the module 10b is transferred in a direction away from the one wall surface 2a of the housing 2, and the heat generating component is connected via the connecting conductor 17 connected to the main board 11. 100 heat can be efficiently released to the mother board 3.

  The heat generating component 100 may be formed by mounting a passive component such as a power inductor on the sub-board 100 as the chip component 13.

<Fourth embodiment>
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged view of a main part of a portable device including a module according to the fourth embodiment of the present invention.

  The module 10c of this embodiment is different from the module 10b of FIG. 3 in that the chip component 13 mounted on the main surface of the sub substrate 101 facing the one main surface 11a of the main substrate 11 is different from the module 10b of FIG. The sub-board 101 and the one main surface 11a of the main board 11 are connected through a plurality of external terminals 13a. Specifically, a mounting electrode formed on the main surface of the sub-substrate 101 facing the one main surface 11a of the main substrate 11 and a mounting electrode 11c formed on the one main surface 11a of the main substrate 11 are: The sub-board 101 and the one main surface 11a of the main substrate 11 are connected by being connected via the external terminals 13a of the chip component 13 mounted on the surface of the sub-board 101 facing the one main surface 11a of the main substrate 11. It is connected. Since other configurations are the same as the configurations of the third embodiment described above, description of the configurations will be omitted by attaching the same reference numerals.

    As described above, in this embodiment, the same effects as those of the third embodiment described above can be obtained. Further, when the chip component 13 that connects the sub-board 101 and the one main surface 11 a of the main board 11 is a heat generating component such as a power inductor, the heat of the chip component 13 is directly released to the motherboard 3 through the main board 11. be able to.

  When external terminals are formed on both the upper surface and the lower surface of the IC 12, the sub substrate 101 and the one main surface 11 a of the main substrate 11 may be connected via the external terminal of the IC 12.

<Fifth Embodiment>
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged view of a main part of a portable device including a module according to a fifth embodiment of the present invention.

  The module 10d of this embodiment differs from the module 10 of FIG. 1 in that the first resin layer 14 is disposed on the mother board 3 side and the second resin layer 15 is the main board 11 as shown in FIG. The other main surface 11b is covered. Hereinafter, differences from the above-described first embodiment will be described, and other configurations will be denoted by the same reference numerals, and description of the configurations will be omitted.

  A connection conductor 17 is provided on the first resin layer 14 that covers the IC 12 and the chip component 13. One end of the connection conductor 17 is connected to the mounting electrode 11 c on the one main surface 11 a of the main substrate 11, and the other end is exposed on the surface of the first resin layer 14 and formed on the surface of the first resin layer 14. It is connected to the connection electrode 11d. The connection electrode 11d is connected to the mother board 3.

  As described above, in this embodiment, similarly to the first embodiment described above, the heat of the heat generating component such as the IC 12 or the chip component 13 covered with the first resin layer 14 is opposite to that of the second resin layer 15. Heat is transferred to the surface side of the first resin layer 14 on the side. Therefore, since the first resin layer 14 is arranged on the mother board 3 side, the heat of the heat generating component can be released to the mother board 3 side more efficiently. Further, the heat of the heat generating component can be released to the mother board 3 more efficiently through the connection conductor 17 connected to the mother board 3.

<Sixth Embodiment>
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged view of a main part of a portable device including a module according to a sixth embodiment of the present invention.

  The module 10e of this embodiment differs from the module 10d of FIG. 5 in that, as shown in FIG. 6, heat generation is provided with a sub-board 101 on which the IC 12 and the chip component 13 are mounted on one main surface 11a of the main board 11. The component 100 is mounted. In addition, the sub-board 101 and the one main surface 11a of the main substrate 11 are connected to each other through a plurality of external terminals 13a included in the chip component 13 mounted on the main surface of the main substrate 11 facing the one main surface 11a. Is connected. Since other configurations are the same as the configurations of the fifth embodiment described above, description of the configurations will be omitted by attaching the same reference numerals.

  As described above, in this embodiment, the same effects as in the fourth and fifth embodiments described above can be achieved.

<Seventh embodiment>
A seventh embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged view of a main part of a portable device including a module according to a seventh embodiment of the present invention.

  The module 10f of this embodiment is different from the module 10e of FIG. 6 in that, as shown in FIG. 7, the mounting electrode formed on the main surface of the sub substrate 101 facing the one main surface 11a of the main substrate 11 The mounting electrode 11c formed on the one main surface 11a of the main substrate 11 is connected by the connection conductor 17 so that the sub substrate 101 and the one main surface 11a of the main substrate 11 are connected. is there. Since other configurations are the same as the configurations of the sixth embodiment described above, the description of the configurations is omitted by giving the same reference numerals.

  As described above, in this embodiment, the same effects as those of the third and fifth embodiments described above can be achieved.

<Eighth Embodiment>
A seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is an enlarged view of a main part of a portable device including a module according to the eighth embodiment of the present invention.

  The module 10g of this embodiment differs from the module 10d of FIG. 5 in that the chip component 13 is mounted on the mounting electrode 11c formed on the other main surface 11b of the main substrate 11, as shown in FIG. Is a point. The other main surface 11 b of the main substrate 11 and the chip component 13 are covered with a second resin layer 15. Since other configurations are the same as the configurations of the above-described eighth embodiment, the description of the configurations is omitted by giving the same reference numerals.

  As described above, in this embodiment, the same effects as those of the fifth embodiment described above can be obtained, and the following effects can be obtained. That is, the mounting density of the module 10g can be improved by mounting components such as the chip component 13 on the other main surface 11b of the main substrate 11.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention. By providing a heat-generating component formed by a so-called power semiconductor element that generates heat, such as a bipolar transistor, a rectifier diode, an insulated gate bipolar transistor (IGBT), a thyristor, a gate turn-off thyristor (GTO), a triac, etc. Various modules can be provided.

  The first and third resin layers and the second resin layer can be formed of a general resin material for molding. For example, the first and third resin layers are heated. It is preferable to form the second resin layer from a resin material having a conductivity of about 10 W / (m · k), and to form the second resin layer from a resin material having a thermal conductivity of about 0.1 W / (m · k). Also, by making the thermal conductivity of the resin material of the first resin layer different from the thermal conductivity of the resin material of the third resin layer, the thermal conductivity in the module is directed from the housing side to the motherboard side. You may make it become high in steps. Specifically, in the module 10a of FIG. 2, the thermal conductivity of the resin material of the third resin layer may be higher than the thermal conductivity of the resin material of the first resin layer. That is, by appropriately setting the thermal conductivity of the resin material of each resin layer, the direction of the gradient of thermal conductivity in the module can be adjusted, so that the heat of the heat generating component is released in a predetermined direction outside the module. Can do.

  The present invention can be widely applied to a module that is housed in a housing in a state of being mounted on a motherboard and is disposed in the vicinity of one wall surface of the housing, and a portable device including the module.

DESCRIPTION OF SYMBOLS 1 Portable apparatus 2 Case 2a One wall surface 3 Mother board 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g Module 11 Main board 11a One main surface 11b The other main surface 12 Semiconductor IC (semiconductor element, heat generating component, active component) )
13 Chip parts (other parts, passive parts)
13a External terminal 14 First resin layer 15 Second resin layer 16 Third resin layer 17 Connection conductor 100 Heat-generating component 101 Sub-board

Claims (8)

In a module that is housed in a housing in a state of being mounted on a motherboard and is arranged close to one wall surface of the housing,
A main board;
A heat generating component mounted on one main surface of the main substrate;
A first resin layer formed by coating one main surface of the main substrate and the heat generating component with a resin material;
A second resin layer made of a resin material having a lower thermal conductivity than the resin material of the first resin layer,
The module, wherein the second resin layer is arranged closer to the one wall surface of the housing than the first resin layer. The main board is disposed on the motherboard side;
The module according to claim 1, wherein the second resin layer covers the first resin layer. Other components mounted on the other main surface of the main board,
A third resin layer formed by coating the other main surface of the main substrate and the other components with the same resin material as the first resin layer;
A columnar connection conductor provided on the third resin layer, having one end connected to the other main surface of the main substrate and the other end exposed on the surface of the third resin layer and connected to the motherboard; The module according to claim 1, further comprising:   4. The heat generating component includes a sub-board on which an active component and a passive component are mounted, and the sub-board and one main surface of the main board are connected to each other. The listed module.   At least one of the active component and the passive component includes a sub-board and the main board that include a plurality of external terminals mounted on a main surface of the sub-board that faces the one main surface of the main board. 5. The module according to claim 4, wherein one main surface of the module is connected to each other through the external terminals. The first resin layer is disposed on the motherboard side;
The module according to claim 1, wherein the second resin layer covers the other main surface of the main substrate.   The module according to claim 1, wherein the heat generating component includes a semiconductor element for power control. In a portable apparatus provided with the module in any one of Claims 1 thru | or 7,
A portable device, wherein the housing is a housing of the device.

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