Abstract:
An electronic circuit device comprising an attaching material between an electronic component and a circuit board is disclosed. A bonding resin is situated on a side of an electronic component and flowed between the electronic component and a circuit board. The flow action may be facilitated by thermoplasticity and capillary action.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2008-327979, filed on Dec. 24, 2008, entitled “CIRCUIT DEVICE AND ELECTRONIC DEVICE”. The content of which is incorporated by reference herein in its entirety. 
       FIELD 
       [0002]    Embodiments of the present disclosure generally relate to circuit devices, and more particularly relate to circuit devices comprising a circuit board and an electronic component mounted on the circuit board with a fixing material. 
       BACKGROUND 
       [0003]    Various electronic devices such as personal digital assistances (PDA) and personal computers (PC) comprise circuit devices in which electronic components are mounted on circuit boards. Recently, Ball Grid Arrays (BGA) and Chip Size/Scale Packages (CSP) have been used for mounting electronic component on circuit boards in order to improve bonding and miniaturization. A BGA generally directly bonds an integrated circuit chip to a circuit board using an array of on-chip bond pads that are directly soldered to an array of circuit board bond pads. A CSP is generally a chip package with an area not greater than about 1.2 times that of the chip and is generally a single-chip direct-surface-mountable package. 
         [0004]    An electric component using a BGA or a CSP is attached to a circuit board using a sealing resin referred to as an underfill material which is used as an attaching material and is placed between the BGA or the CSP and a circuit board. In some of circuit devices, a shielding member is placed around the electronic component in order to protect the electronic component from noise. In order to increase miniaturization of the circuit devices, the shielding member is brought close to the electronic component. 
         [0005]    In such circuit devices, it is necessary for the attaching material to be appropriately situated between the electronic component and the circuit board to properly attach the electronic component to the circuit board. Therefore, there is a need for improved methods of forming and placement of attaching material between an electronic component and a circuit board. 
       SUMMARY 
       [0006]    An electronic circuit device comprising an attaching material between an electronic component and a circuit board is disclosed. A bonding resin is situated on a side of an electronic component and flowed between the electronic component and a circuit board. The flow action may be facilitated by thermoplasticity and capillary action. 
         [0007]    An embodiment comprises a circuit device. The circuit device comprises a circuit board and an electronic component coupled to the circuit board. The circuit device further comprises an attaching material attaching the electronic component to the circuit board. The attaching material is operable to attach the electronic component to the circuit board. The attaching material comprises a first portion located substantially between the electronic component and the circuit board, and a second portion substantially located outside the first portion. The circuit device also comprises a shielding member located substantially around the electronic component and comprising at least one opening in a region substantially closest to and adjacent to the second portion. 
         [0008]    An embodiment comprises a circuit device. The circuit device comprises a circuit board and an electronic component on the circuit board. The circuit device further comprises a shielding member substantially around the electronic component. The circuit device also comprises an attaching material having flowability and operable to attach the electronic component to the circuit board. The shielding member comprises at least one opening located adjacent to a region of the circuit board where the attaching material flows out toward the shielding member. 
         [0009]    An embodiment comprises an electronic device. The electronic device comprises a circuit board and an electronic component on the circuit board. The electronic device further comprises attaching material operable to attach the electronic component to the circuit board. The attaching material comprises a first portion located substantially between the electronic component and the circuit board, and a second portion substantially located outside the first portion. The electronic device also comprises shielding member located substantially around the electronic component and comprising at least one opening in a region substantially closest to and adjacent to the second portion. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    Embodiments of the present disclosure are hereinafter described in conjunction with the following figures, wherein like numerals denote like elements. The figures are provided for illustration and depict exemplary embodiments of the disclosure. The figures are provided to facilitate understanding of the disclosure without limiting the breadth, scope, scale, or applicability of the disclosure. The drawings are not necessarily made to scale. 
           [0011]      FIG. 1  is an illustration of an overall view of an exemplary electronic device comprising a circuit device according to an embodiment of the disclosure. 
           [0012]      FIG. 2  is an illustration of an exploded perspective view of components incorporated in a manipulation-side casing according to an embodiment of the disclosure. 
           [0013]      FIG. 3  is an illustration of a plan view of an exemplary circuit board incorporated in the manipulation-side casing of  FIG. 3  according to an embodiment of the disclosure. 
           [0014]      FIG. 4  is an illustration of exemplary states of an electronic component and a circuit board before an attaching material is applied. 
           [0015]      FIG. 5  is an illustration of a schematic view of an exemplary technique of injecting an attaching material between the circuit board and the electronic component surrounded by a shielding member according to an embodiment of the disclosure. 
           [0016]      FIG. 6  is an illustration of a perspective view of an exemplary circuit device according to an embodiment of the disclosure. 
           [0017]      FIG. 7A  is an illustration of a plan view of an exemplary circuit device when an attaching material is applied according to an embodiment of the disclosure. 
           [0018]      FIG. 7B  is an illustration of a plan view of an exemplary circuit device when an attaching material is cured according to an embodiment of the disclosure. 
           [0019]      FIG. 8  is an illustration of a sectional view taken along a line VIII-VIII of  FIG. 7A . 
           [0020]      FIG. 9  is an illustration of an exemplary state in which a cap is attached to the circuit device of  FIG. 8 . 
           [0021]      FIG. 10  is an illustration of a side view of a shielding member comprised in the circuit device according to an embodiment of the disclosure. 
           [0022]      FIG. 11  is an illustration of a side view of an exemplary circuit device according to an embodiment of the disclosure. 
           [0023]      FIG. 12  is an illustration of a perspective view of an exemplary circuit device according to an embodiment of the disclosure. 
           [0024]      FIG. 13A  is an illustration of an enlarged view of  FIG. 12  illustrating an opening in a shielding member comprised in the circuit device according to an embodiment of the disclosure. 
           [0025]      FIG. 13B  is an illustration of an enlarged view illustrating an opening in a shielding member comprised in the circuit device according to an embodiment of the disclosure. 
           [0026]      FIG. 14  is an illustration of a sectional view of an exemplary structure of a cap according to an embodiment of the disclosure. 
           [0027]      FIG. 15  is an illustration of a side view of an exemplary structure of a cap according to an embodiment of the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0028]    The following description is presented to enable a person of ordinary skill in the art to make and use the embodiments of the disclosure. The following detailed description is exemplary in nature and is not intended to limit the disclosure or the application and uses of the embodiments of the disclosure. Descriptions of specific devices, techniques, and applications are provided only as examples. Modifications to the examples described herein will be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other examples and applications without departing from the spirit and scope of the disclosure. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. The present disclosure should be accorded scope consistent with the claims, and not limited to the examples described and shown herein. 
         [0029]    Embodiments of the disclosure are described herein in the context of one practical non-limiting application, namely, a cell phone. Embodiments of the disclosure, however, are not limited to such cell phone devices and the techniques described herein may also be utilized in other applications. For example, embodiments may be applicable to optical devices such as digital cameras, PCs, personal handy phone system (PHS), PDA, portable navigation device, notebook computer, game machine, and the like. 
         [0030]    As would be apparent to one of ordinary skill in the art after reading this description, these are merely examples and the embodiments of the disclosure are not limited to operating in accordance with these examples. Other embodiments may be utilized and structural changes may be made without departing from the scope of the exemplary embodiments of the present disclosure. 
         [0031]      FIG. 1  is an illustration of an overall view of an exemplary electronic device such as a cell phone  1  comprising a circuit device (not shown in  FIG. 1  see  100  in  FIG. 6 ) according to an embodiment of the disclosure. The cell phone  1  may be a foldable cell phone comprising a casing  1 C. The casing  1 C comprises a display-side casing  1 CA and a manipulation-side casing  1 CB. The cell phone  1  can be opened and closed by the display-side casing  1 CA and the manipulation-side casing  1 CB. 
         [0032]    A display  2 M and a speaker  6  are located in the display-side casing  1 CA. An idle image is displayed on the display  2 M when the cell phone  1  is in a standby state, and a menu image is displayed on the display  2 M in order to assist the manipulation of the cell phone  1 . Sounds come out from the speaker  6 , for example, during a call using the cell phone  1 . 
         [0033]    The manipulation-side casing  1 CB comprises, a plurality of manipulation keys  3 , a direction and determination key  4 , an antenna (not shown), and a microphone  5 . The manipulation key  3  is used to, for example, to input a telephone number of a callee, characters for composing an email or a text message, and the like. The direction and determination key  4  is used to facilitate selection and determination of the menu displayed on the display  2 M and scrolling of the screen. The antenna is located in the manipulation-side casing  1 CB, and is used to perform transmission and reception between the cell phone  1  and a base station. The microphone  5  receives a sound during a call using the cell phone  1 . 
         [0034]    The display-side casing  1 CA and the manipulation-side casing  1 CB are coupled by a hinge mechanism  9 . Therefore, the display-side casing  1 CA and the manipulation-side casing  1 CB can turn about the hinge mechanism  9  in both of directions; in which the display-side casing  1 CA and the manipulation-side casing  1 CB move away from each other, and in which the display-side casing  1 CA and the manipulation-side casing  1 CB move close to each other. The cell phone  1  is opened when the display-side casing  1 CA and the manipulation-side casing  1 CB turn in the direction in which the display-side casing  1 CA and the manipulation-side casing  1 CB move away from each other by a substantially maximum range of motion, and the cell phone  1  is closed when the display-side casing  1 CA and the manipulation-side casing  1 CB turn in the direction in which the display-side casing  1 CA and the manipulation-side casing  1 CB move toward each other by a substantially maximum range of motion. 
         [0035]      FIG. 2  is an illustration of an exploded perspective view of components incorporated in the manipulation-side casing  1 CB according to an embodiment of the disclosure. A circuit board  12  on which an electronic component  30  ( FIG. 3 ) is mounted is located in the manipulation-side casing  1 CB. As illustrated in  FIG. 2 , a key sheet  10 , a flexible wiring circuit board  11 , and a circuit board  12  are located in the manipulation-side casing  1 CB in a laminated manner. The key sheet  10  comprises the manipulation key  3  and the direction and determination key  4 . The circuit board  12  comprises various electronic components, comprising a reference potential pattern layer and a cell phone Radio Frequency (RF) module. A circuit board for the display  2 M is also located in the display-side casing  1 CA. 
         [0036]      FIG. 3  is an illustration of a plan view of an exemplary circuit board  12  incorporated in the manipulation-side casing  1 CB of  FIG. 3  according to an embodiment of the disclosure.  FIG. 4  is an illustration of exemplary states of the electronic component  30  and the circuit board  12  before an attaching material such as an underfill material  40  ( FIG. 5 ) is applied.  FIG. 5  is an illustration of a schematic view of an exemplary technique of injecting the underfill material  40  between the circuit board  12  and the electronic component  30  surrounded by a shielding member  20  according to an embodiment of the disclosure. 
         [0037]    As shown in  FIG. 3 , the electronic component  30  is mounted on the circuit board  12 , and may comprise a BGA, however, the electronic component may comprise, for example and without limitation, a CSP, and the like. The shielding member  20  is located around the electronic component  30 . 
         [0038]    As shown in  FIG. 4 , the electronic component  30  comprises solder balls  31  so as to be connected to an electrode on the circuit board  12 . After the electronic component  30  is coupled to the circuit board  12 , the underfill material  40  is injected between the electronic component  30  and the circuit board  12 , on a bottom side of  32  of the electronic component  30  to improve mounting strength of the electronic component  30 . 
         [0039]    The shielding member  20  is made of a conductive material, for example but without limitation, a metal, and like, to protect the electronic component  30  from an electromagnetic wave such as a high-frequency noise. A predetermined distance L is provided between the electronic component  30  and the shielding member  20 . The distance L may be shortened as much as possible to allow the miniaturization of the electronic device. The distance L may be, for example but without limitation, about 0.5 mm, and the like. 
         [0040]    The shielding member  20  and the electronic component  30  are mounted on the circuit board  12  by the following procedure. First the shielding member  20  and the electronic component  30  are located at predetermined locations on the circuit board  12 . The circuit board  12  is subjected to a heat treatment. Therefore, the solder balls  31  of the electronic component  30  are melted to tentatively attach the electronic component  30  to the circuit board  12 . Then, the underfill material  40  is injected between the electronic component  30  and the circuit board  12  to heat the underfill material  40 . In this manner, the electronic component  30  is attached to the circuit board  12  by the underfill material  40  cured between the circuit board  12  and the electronic component  30 , and thus connection reliability improves between the electronic component  30  and the circuit board  12 . 
         [0041]    The underfill material  40  may be, for example but without limitation, a sealing resin which has thermoplasticity. The underfill material  40  may be a one-component curing epoxy resin. The underfill material  40  has flowability before curing, and penetrates between the electronic component  30  and the circuit board  12  by capillarity when applied around the electronic component  30 . Specifically, the underfill material  40  penetrates into a space located between the solder balls  31 . 
         [0042]    As illustrated in  FIGS. 4 and 5 , the shielding member  20  comprises an upper opening  22 ; therefore, the underfill material  40  can be injected between the electronic component  30  and the circuit board  12  from the upper opening  22 . That is, as illustrated in  FIG. 5 , for example, a syringe  50  is put in from the upper opening  22  of the shielding member  20  to apply the underfill material  40  to a part of circumference of the electronic component  30 . When the underfill material  40  is cured to attach the electronic component  30  to the circuit board  12 , the upper opening  22  is closed by a conductive material, for example, the same material as the shielding member  20 . 
         [0043]      FIG. 6  is an illustration of a perspective view of an exemplary circuit device  100  according to an embodiment of the disclosure.  FIG. 7A  is an illustration of a plan view of an exemplary circuit device  100  when an attaching material is applied according to an embodiment of the disclosure.  FIG. 7B  is an illustration of a plan view of an exemplary circuit device  100  when an attaching material is cured according to an embodiment of the disclosure.  FIG. 8  is an illustration of a sectional view taken along a line VIII-VIII of  FIG. 7A .  FIG. 9  is an illustration of an exemplary state in which a cap  25  is attached to the circuit device  100 .  FIG. 10  is an illustration of a side view of a shielding member  20  comprised in the circuit device  100  according to an embodiment of the disclosure.  FIG. 11  is an illustration of a side view of an exemplary circuit device  100  according to an embodiment of the disclosure. The circuit device  100  of the embodiment is mounted on the cell phone  1  illustrated in  FIGS. 1 and 2 . 
         [0044]    The circuit device  100  comprises the electronic component  30 , the shielding member  20 , and the underfill material  40  (attaching material). The shielding member  20  comprises an opening  23 . As illustrated in  FIGS. 6 and 7A , the electronic component  30  is mounted on the circuit board  12 . The shielding member  20  is located around the electronic component  30 . As mentioned above, the underfill material  40  has the thermoplasticity, and the underfill material  40  is cured between the circuit board  12  and the electronic component  30  to attach the electronic component  30  to the circuit board  12 . The opening  23  is provided as a part of the shielding member  20 , which faces a region where the underfill material  40  flows out toward the shielding member  20 . In the embodiment shown in  FIGS. 7A and 7B , the shielding member  20  comprises two openings  23 . However, the number of the opening in the shielding member  20  is not limited to two and can be selected in accordance with a shape of the electronic component  30  and a shape of the shielding member  20  and so on. 
         [0045]    According to an embodiment, the electronic component  30  has a substantially rectangular shape. The shielding member  20  around the electronic component  30  comprises four walls  21 A,  21 B,  21 L, and  21 R that are substantially perpendicular to the circuit board  12 . Accordingly, the electronic component  30  is surrounded by the four walls  21 A,  21 B,  21 L, and  21 R of the shielding member  20 . 
         [0046]    As illustrated in  FIG. 7A , the underfill material  40  is applied to a part of the circumference of the electronic component  30  in the circuit board  12 . In the embodiment shown in  FIG. 7A , because the electronic component  30  has a substantially rectangular shape, the underfill material  40  is applied to a side  30 A ( FIG. 7B ) facing the wall  21 A of the shielding member  20  of the electronic component  30 . Thus, a route for air to pass through can be provided by applying the underfill material  40  to a part (as compared to a whole) of the circumference of the electronic component  30 . In this manner, production of air bubbles in the underfill material  40  injected between the circuit board  12  and the electronic component  30  is reduced. 
         [0047]    In an embodiment shown in  FIG. 7B , the electronic component  30  comprises four sides. A side  30 A is located near a region where the underfill material  40  is applied. A side  30 B is opposite to the first side  30 A. A side  30 L and a side  30 R are substantially perpendicular to the side  30 A and the side  30 B. A distance LA is a length between the side  30 A of the electronic component  30  and the wall  21 A of the shielding member  20  to which the underfill material  40  is applied. A distance LB is a length between the side  30 B of the electronic component  30  and the wall  21 B of the shielding member  20  to which the underfill material  40  is not applied. In the embodiment shown in  FIG. 7B , the distance LA is longer than the distance LB. In this manner, a compact circuit board such as the circuit board  12  can be provided while the underfill material  40  is easily applied to the electronic component  30  substantially surrounded by the shielding member  20 . 
         [0048]    In an embodiment, the wall  21 B is located opposite to the wall  21 A, and the wall  21 L is located opposite to the wall  21 R. A distance LL is a length between the wall  30 L of the electronic component  30  and the wall  21 L of the shielding member  20 . A distance LR is a length between the wall  30 R of the electronic component  30  and the wall  21 R of the shielding member  20 . In the embodiment shown in  FIG. 7B , the distance LL is equal to the distance LR (LL=LR). The distance LL and the distance LR are shorter than the distance LA and longer than the distance LB (LB&lt;LL&lt;LA and LB&lt;LR&lt;LA). 
         [0049]    As described above, the underfill material  40  has the thermoplastic, and the underfill material  40  has the flowability before heat treatment. Therefore, when the underfill material  40  is applied to part of the circumference of the electronic component  30 , the underfill material  40  partially penetrates between the circuit board  12  and the electronic component  30  by the capillarity. Part of the applied underfill material  40  does not penetrate between the circuit board  12  and the electronic component  30 , but flows on the circuit board  12  toward the shielding member  20  ( FIG. 7B ). Part of the underfill material  40  penetrating between the circuit board  12  and the electronic component  30  flows out from a gap between the circuit board  12  and the electronic component  30  and flows on the circuit board  12  toward the shielding member  20  ( FIG. 7B ). Thus, part of the underfill material  40  applied to part of the circumference of the electronic component  30  flows out toward the shielding member  20  via a flow region F ( FIG. 7A ). 
         [0050]    The opening  23  is provided in a part of the shielding member  20 , which is adjacent to the flow region F. In the embodiment shown in  FIG. 7A , the opening  23  is provided in walls  21 L and  21 R of the shielding member  20  that is located substantially closest to the region in which the underfill material  40  is applied. In this example embodiment, since the shielding member  20  comprises two walls  21 L and  21 R located substantially closest to the region in which the underfill material  40  is applied, the shielding member  20  comprises two openings  23 . 
         [0051]    Specifically, as shown  FIGS. 7B and 8 , the underfill material  40  comprise a first portion  40 A and a second portion  40 B. The first portion  40 A is located substantially between the electronic component  30  and the circuit board  12 . The second portion  40 B is located outside the first portion  40 A. The opening  23  is located in a neighboring region comprising a substantially closest region to the second portion  40 B in the shielding member  20 . 
         [0052]    In the circuit device  100 , because the underfill material  40  flowing toward the shielding member  20  flows out from the opening  23  in the shielding member  20 , the amount of underfill material  40  adhering to the shielding member  20  by the capillarity can be reduced as illustrated in  FIG. 8  even in the small distances LL and LR between the electronic component  30  and the walls  21 L and  21 R of the shielding member  20 . Therefore, a necessary amount of underfill material  40  can be disposed between the circuit board  12  and the electronic component  30 , so that the electronic component  30  can properly be attached to the circuit board  12  by the underfill material  40  with sufficient mounting strength. Further, the adhesion of the underfill material  40  to the shielding member  20  can effectively be reduced by the opening  23  in the wall of the shielding member  20 , which is located substantially closest to the portion in which the underfill material  40  is applied. When the underfill material  40  between the circuit board  12  and the electronic component  30  is cured by the heat treatment after the application of the underfill material  40 , a cap  25  ( FIG. 9 ) is attached to the upper opening  22  of the shielding member  20  to complete the circuit device  100 . 
         [0053]    In an embodiment, a water-repellent material may be applied to an inner surface of the shielding member  20  in the circuit device  100 . Therefore, the adhesion of the underfill material  40  to the shielding member  20  can further be reduced. As a result, the circuit device  100  can further have sufficient mounting strength of the electronic component  30 , and the electronic component  30  can properly be attached to the circuit board  12  by the underfill material  40 . The water-repellent material may be applied to at least part of the inner surface of the shielding member  20 . For example, the water-repellent material may be applied to a region close to the flow region F in the inner surface of the shielding member  20 . Alternatively, the water-repellent material may be applied to the neighboring region comprising a region substantially closest to the second portion  40 B in the shielding member  20 . 
         [0054]    As illustrated in  FIG. 10 , in the circuit device  100 , the opening  23  is a notch on the side of the wall  21 R/ 21 L of the shielding member  20  of the circuit board  12 . The opening  23 /notch is provided in part of a attaching portion  21 T of the shielding member  20  coming into contact with the wall  21 R/ 21 L. In the embodiment shown in  FIG. 10 , the opening  23 /notch is opened to the circuit board  12 . Therefore, the underfill material  40  on the circuit board  12  passes easily through the opening  23 . As a result, the necessary amount of underfill material  40  can be disposed between the circuit board  12  and the electronic component  30  while the adhesion of the underfill material  40  to the shielding member  20  is effectively reduced. 
         [0055]    In an embodiment, the opening  23  may have, for example but without limitation, a rectangular shape, a semi-spherical shape, a triangular shape, a polygonal shape, and the like. 
         [0056]    As illustrated in  FIG. 11 , in the circuit device  100 , a width L 2  of the opening  23  may be smaller than a width L 1  of the electronic component  30  in a portion facing the opening  23  (L 2 &lt;L 1 ). Therefore, because a decrease in area of the shielding member  20  is reduced, lowering of the strength of the shielding member  20  and degradation of the shielding effect can be reduced. The width L 2  of the opening  23  is a size of the opening  23  along a surface of the circuit board  12  when viewed from the top. The width L 1  of the electronic component  30  is a length of the electronic component  30  facing the opening  23  along the surface of the circuit board  12  when viewed from the top. 
         [0057]    A height h 23  (from the circuit board  12 ) of the opening  23  may be substantially a minimum within a range where the underfill material  40  does not adhere to the opening  23 . In this case, lowering of the strength of the shielding member  20  and the degradation of the shielding effect can more effectively be reduced. The height h 23  of the opening  23  is a size of the opening  23  along the direction substantially perpendicular to the surface of the circuit board  12 . 
         [0058]    As illustrated in  FIG. 11 , in the circuit device  100 , the opening  23  in the wall  21 R ( 21 L) of the shielding member  20  is opened to the side of the portion to which the underfill material  40  is applied beyond a first end  30 U of the electronic component  30  on the first side  30 A to which the underfill material  40  is applied. Specifically, as illustrated in  FIG. 11 , the wall  21 R comprises a first region  21   x  adjacent to the region to which the underfill material  40  is applied and a second region  21   y  adjacent to the electronic component  30 . The opening  23  is located over the first region  21   x  and the second region  21   y  of the wall  21 R. That is, in a direction along the surface of the circuit board  12  when viewed from side, the end  30 U of the electronic component  30  is located between a first end  23 S of the opening  23  and a second end  23 T of the opening  23 . Therefore, the underfill material  40  flowing toward the shielding member  20  from the portion to which the underfill material  40  is applied passes properly through the opening  23 . As a result, the necessary amount of underfill material  40  can be disposed between the circuit board  12  and the electronic component  30  while the adhesion of the underfill material  40  to the shielding member  20  is reduced. 
         [0059]      FIG. 12  is an illustration of a perspective view of an exemplary circuit device  100   b  according to an embodiment of the disclosure.  FIG. 13A  is an illustration of an enlarged view of  FIG. 12  illustrating an opening  23   b  in a shielding member  20   b  comprised in the circuit device  100   b  according to an embodiment of the disclosure. 
         [0060]      FIG. 13A  illustrates the opening  23   b  when the opening  23   b  is viewed from a direction of an arrow A in  FIG. 12 . As illustrated in  FIG. 12 , in the circuit device  100   b , the opening  23   b  is located in the walls  21 R and  21 L of the shielding member  20   b , which are adjacent the electronic component  30  and closest to the region in the circuit board  12  to which the underfill material  40  is applied. A corner portion  24  of the opening  23   b  comprises an R-chamfer (radial chamfer). Therefore, in the circuit device  100   b , lowering of the strength of the shielding member  20   b  can effectively be reduced. 
         [0061]      FIG. 13B  is an illustration of an enlarged view of illustrating an opening  23   c  in a shielding member  20   c  comprised in a circuit device  200   b  (not shown) according to an embodiment of the disclosure.  FIG. 13B  illustrates the opening  23   c  when the opening  23   c  is viewed from the same direction in the circuit device  200   b  as the direction of an arrow A in  FIG. 12 . As illustrated in  FIG. 13B , a height of the opening  23   c  is increased toward the first region. That is, the height of the opening  23   c  at the second end  23 T is higher than the height of the opening  23   c  at the first end  23 S. Therefore, in the circuit device  200   b , the adhesion of the underfill material  40  to the shielding member  20  can effectively be reduced. 
         [0062]      FIGS. 14 and 15  are illustrations of a sectional view and a side view of a cap according to an embodiment of the disclosure.  FIG. 15  illustrates a cap  25   a  when the cap  25   a  is viewed from the side of the opening  23  of the shielding member  20  of  FIG. 14 . As illustrated in  FIG. 14 , a height h 25  (from the circuit board  12 ) of a side face  25 Wa of the cap  25   a  attached to the shielding member  20  is larger than a height h 20  (from the circuit board  12 ) of the shielding member  20 . Therefore, as illustrated in  FIG. 15 , the opening  23  in the shielding member  20  can be closed by the cap  25   a  by attaching the cap  25   a  to the shielding member  20 . As a result, the degradation of the electromagnetic wave shielding effect of the shielding member  20  can be reduced. The h 25  of the side face  25 Wa is a size of the cap  25   a  along the direction substantially perpendicular to the surface of the circuit board  12 . The h 20  of the shielding member  20  is a size of the shielding member  20  along the direction perpendicular to the surface of the circuit board  12 . 
         [0063]    As illustrated in  FIG. 14 , the side face  25 Wa (particularly, the side of the circuit board  12 ) of the cap  25   a  is inclined away from the shielding member  20  as the side face  25 Wa approaches the circuit board  12 . The side face  25 Wa of the cap  25   a , at least the portion facing the opening  23 , that is, in the portion on the side of the circuit board  12  the cap comprises a slope portion  25 F. The slope portion  25 F is inclined such that the slope portion is bent away from the shielding member  20  as the slope portion  25 F approaches the circuit board  12 . In the cap  25   a , the portion that comes into contact with the circuit board  12  is away from the shielding member  20 . Therefore, the contact between the underfill material  40  and the cap  25   a  can properly be reduced when the underfill material  40  passes through the opening  23  of  FIG. 15 . From the viewpoint of the easy production of the cap  25   a , in the side face  25 Wa of the cap  25   a , portions except for the portion facing the opening  23  may be inclined such that the portion is away from the shielding member  20  as the portion approaches the circuit board  12 . 
         [0064]    While at least one exemplary embodiment has been presented in the foregoing detailed description, the present disclosure is not limited to the above-described embodiment or embodiments. Variations may be apparent to those skilled in the art. In carrying out the present disclosure, various modifications, combinations, sub-combinations and alterations may occur in regard to the elements of the above-described embodiment insofar as they are within the technical scope of the present disclosure or the equivalents thereof. The exemplary embodiment or exemplary embodiments are examples, and are not intended to limit the scope, applicability, or configuration of the disclosure in any way. Rather, the foregoing detailed description will provide those skilled in the art with a template for implementing the exemplary embodiment or exemplary embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope of the disclosure as set forth in the appended claims and the legal equivalents thereof. Furthermore, although embodiments of the present disclosure have been described with reference to the accompanying drawings, it is to be noted that changes and modifications may be apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of the present disclosure as defined by the claims. 
         [0065]    Terms and phrases used in this document, and variations hereof, unless otherwise expressly stated, should be construed as open ended as opposed to limiting. As examples of the foregoing: the term “including” should be read as mean “including, without limitation” or the like; the term “example” is used to provide exemplary instances of the item in discussion, not an exhaustive or limiting list thereof; and adjectives such as “conventional,” “traditional,” “normal,” “standard,” “known” and terms of similar meaning should not be construed as limiting the item described to a given time period or to an item available as of a given time, but instead should be read to encompass conventional, traditional, normal, or standard technologies that may be available or known now or at any time in the future. Likewise, a group of items linked with the conjunction “and” should not be read as requiring that each and every one of those items be present in the grouping, but rather should be read as “and/or” unless expressly stated otherwise. Similarly, a group of items linked with the conjunction “or” should not be read as requiring mutual exclusivity among that group, but rather should also be read as “and/or” unless expressly stated otherwise. Furthermore, although items, elements or components of the disclosure may be described or claimed in the singular, the plural is contemplated to be within the scope thereof unless limitation to the singular is explicitly stated. The presence of broadening words and phrases such as “one or more,” “at least,” “but not limited to” or other like phrases in some instances shall not be read to mean that the narrower case is intended or required in instances where such broadening phrases may be absent. The term “about” when referring to a numerical value or range is intended to encompass values resulting from experimental error that can occur when taking measurements.