Abstract:
A semiconductor device includes: a substrate on which a first contact portion is formed; a lower shield plate provided above the substrate to avoid the first contact portion and including a magnetic substance; a semiconductor chip provided above the lower shield plate and including a second contact portion electrically connected to the first contact portion, and a connection member that electrically connects the first contact portion and the second contact portion; and an upper shield plate provided above the semiconductor chip to avoid the second contact portion and the connection member and including a magnetic substance. An end of at least one of the lower shield plate and the upper shield plate is bent toward the other one of the lower shield plate and the upper shield plate so have a side wall portion whose tip is connected to the other one of the lower shield plate and the upper shield plate.

Description:
TECHNICAL FIELD 
       [0001]    The embodiments described herein relate to a semiconductor device and a method for producing the same. 
       BACKGROUND ART 
       [0002]    Some semiconductor devices are susceptible to an external magnetic field. Such semiconductor devices that are susceptible to a magnetic field can be suitably operated by reducing the influence of an external magnetic field by using a magnetic shield. An example of a known magnetic shield used for a semiconductor device is an electromagnetic wave absorption mold resin that contains a high-magnetic-permeability material as a filler and that covers an upper surface and a side surface of a semiconductor chip so as to reduce the influence of an external magnetic field on the semiconductor device. 
       CITATION LIST 
     Patent Literature 
       [0003]    Patent Literature 1: JP 2005-217221 A 
       SUMMARY OF INVENTION 
     Problem to be Solved by the Invention 
       [0004]    The embodiments described herein provide a semiconductor device that has an enhanced magnetic shield effect, and a method for producing the same. 
       MEANS FOR SOLVING THE PROBLEM 
       [0005]    A semiconductor device according to the embodiments includes a substrate on which a first contact portion is formed, and a lower shield plate that is provided above the substrate so as to avoid the first contact portion and includes a magnetic substance. Furthermore, the semiconductor device includes a semiconductor chip that is provided above the lower shield plate and has a second contact portion electrically connected to the first contact portion, and a connection member that electrically connects the first contact portion and the second contact portion. Furthermore, the semiconductor device includes an upper shield plate that is provided above the semiconductor chip so as to avoid the second contact portion and the connection member and includes a magnetic substance. An end of at least one of the lower shield plate and the upper shield plate is bent toward the other one of the lower shield plate and the upper shield plate so as to have a side wall portion whose tip is connected to the other one of the lower shield plate and the upper shield plate. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0006]      FIG. 1  is a plan view schematically illustrating a semiconductor device according to first embodiment. 
           [0007]      FIG. 2  is side views schematically illustrating the semiconductor device. 
           [0008]      FIG. 3  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0009]      FIG. 4  is side views schematically illustrating a method for producing the semiconductor device. 
           [0010]      FIG. 5  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0011]      FIG. 6  is side views schematically illustrating a method for producing the semiconductor device. 
           [0012]      FIG. 7  is side views schematically illustrating a method for producing the semiconductor device. 
           [0013]      FIG. 8  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0014]      FIG. 9  is side views schematically illustrating a method for producing the semiconductor device. 
           [0015]      FIG. 10  is a plan view schematically illustrating a semiconductor device according to second embodiment. 
           [0016]      FIG. 11  is side views schematically illustrating the semiconductor device. 
           [0017]      FIG. 12  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0018]      FIG. 13  is side views schematically illustrating a method for producing the semiconductor device. 
           [0019]      FIG. 14  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0020]      FIG. 15  is side views schematically illustrating a method for producing the semiconductor device. 
           [0021]      FIG. 16  is side views schematically illustrating a method for producing the semiconductor device. 
           [0022]      FIG. 17  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0023]      FIG. 18  is side views schematically illustrating a method for producing the semiconductor device. 
           [0024]      FIG. 19  is a side view schematically illustrating a semiconductor device according to third embodiment. 
           [0025]      FIG. 20  is side views schematically illustrating the semiconductor device. 
           [0026]      FIG. 21  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0027]      FIG. 22  is side views schematically illustrating a method for producing the semiconductor device. 
           [0028]      FIG. 23  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0029]      FIG. 24  is side views schematically illustrating a method for producing the semiconductor device. 
           [0030]      FIG. 25  is side views schematically illustrating a method for producing the semiconductor device. 
           [0031]      FIG. 26  is a plan view schematically illustrating a method for producing the semiconductor device. 
           [0032]      FIG. 27  is side views schematically illustrating a method for producing the semiconductor device. 
           [0033]      FIG. 28  is side views schematically illustrating a semiconductor device according to another embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0034]    Embodiments of a semiconductor storage device are described below with reference to the drawings. 
         [0035]    Configuration of Semiconductor Device According to First Embodiment 
         [0036]    First, a configuration of a semiconductor device according to first embodiment is described with reference to  FIGS. 1 and 2 .  FIG. 1  is a plan view schematically illustrating a semiconductor device according to first embodiment.  FIG. 2( a )  is a cross-sectional view taken along the line I-I′ in  FIG. 1 , and  FIG. 2( b )  is a cross-sectional view taken along the line II-II′ in  FIG. 1 . 
         [0037]    As illustrated in  FIGS. 1 and 2 , the semiconductor device according to the present embodiment includes a substrate  1 , a lower shield plate  3  attached onto the substrate  1  with an insulating first adhesive  2  sandwiched therebetween, a semiconductor chip  5  mounted on the lower shield plate  3  with an insulating second adhesive  4  sandwiched therebetween, a first insulating resin  6  that covers an upper surface and some side surfaces of the semiconductor chip  5 , and an upper shield plate  7  attached onto an upper surface of the first insulating resin  6 . The lower shield plate  3  has a side wall portion  32  extending in a direction in which these members are stacked, and the side wall portion  32  is in contact with a lower surface of the upper shield plate  7 . These members are embedded in a second insulating resin  9 . In  FIG. 1 , the illustration omits the second insulating resin  9  for explanation. 
         [0038]    In the present embodiment, insulating materials such as ceramics, a resin, or silicon (Si) whose surface has been oxidized is used as the substrate  1 . Wires (not illustrated) and contact portions  11  (first contact portions) that are connected to the wires are provided on a surface of the substrate  1 . The wires and the contact portions  11  are formed by printing, vapor deposition, or another method by using a metal such as copper. The contact portions  11  are bonding pads connected to the semiconductor chip  5  and are aligned at predetermined intervals along both side surfaces of the lower shield plate  3  in a direction (hereinafter referred to as a “first direction”) in which the lower shield plate  3  extends. 
         [0039]    The lower shield plate  3  is a rectangle whose longitudinal direction is the first direction, and the first adhesive  2  is attached onto a lower surface thereof. The length of the lower shield plate  3  in the first direction is longer than that of the semiconductor chip  5  in the first direction. The width of the lower shield plate  3  in a direction (hereinafter referred to as a “second direction”) orthogonal to the first direction is smaller than an interval between the contact portions  11  in the second direction and is almost the same as the width of the semiconductor chip  5  in the second direction. A high-magnetic-permeability material is used as the lower shield plate  3 . In the present embodiment, a magnetic alloy containing iron such as PC permalloy (Ni—Mo, Cu—Fe) is used. Note that in the present embodiment, the thickness of the lower shield plate  3  is approximately from 50 μm to 150 μm. 
         [0040]    In the present embodiment, the lower shield plate  3  has the side wall portion  32 . In the present embodiment, the side wall portion  32  is formed by bending a plate made of a magnetic alloy. Accordingly, in the present embodiment, the thickness of the lower shield plate  3  is almost the same as that of the side wall portion  32 . 
         [0041]    The semiconductor chip  5  includes an integrated circuit. In the present embodiment, a storage device in which a plurality of data are magnetically stored is mounted as the semiconductor chip  5 . The storage device may be, for example, one in which data is written by spin injection and the written data is discriminated on the basis of a change of resistance caused by a tunnel magneto resistance effect. Note that a different storage device may be mounted as the semiconductor chip  5  or a configuration other than a storage device may be mounted as the semiconductor chip  5 . 
         [0042]    The second adhesive  4  is attached onto a lower surface of the semiconductor chip  5 , and contact portions  12  (second contact portions) are provided on an upper surface of the semiconductor chip  5  on both sides in the second direction. The contact portions  12  are electrically connected to the contact portions  11  via bonding wires  51  that are a plurality of connection members. 
         [0043]    The upper shield plate  7  is a rectangle whose longitudinal direction is the first direction, and the first insulating resin  6  is attached onto a lower surface thereof. The width of the upper shield plate  7  in the second direction is smaller than that of the contact portions  12  in the second direction. The length of the upper shield plate  7  in the first direction is almost the same as that of the lower shield plate  3  in the first direction. A high-magnetic-permeability material is used as the upper shield plate  7  as with the lower shield plate  3 . In the present embodiment, a magnetic alloy containing iron such as PC permalloy (Ni—Mo, Cu—Fe) is used. In the present embodiment, the thickness of the upper shield plate  7  is approximately from 50 μm to 150 μm. 
         [0044]    The upper shield plate  7  is in contact with the lower shield plate via the side wall portion  32 . Accordingly, the upper shield plate  7  forms a magnetic shield that protects the semiconductor device  5  from an external magnetic field together with the lower shield plate  3 . 
         [0045]    In the semiconductor device according to the present embodiment, the lower surface of the semiconductor chip  5  is covered with the lower shield plate  3 , the upper surface of the semiconductor chip  5  is covered with the upper shield plate  7 , and the side surface of the semiconductor chip  5  is covered with the side wall portion  32 . Furthermore, the width of the lower shield plate  3  in the second direction is almost the same as that of the semiconductor chip  5  in the second direction, and although the width of the upper shield plate  7  in the second direction is slightly smaller than that of the semiconductor chip  5  in the second direction, a main portion of the semiconductor chip  5  is suitably protected from an external magnetic field. The width of the lower shield plate  3  and the width of the upper shield plate  7  are set to ones that can prevent the lower shield plate  3  and the upper shield plate  7  from making contact with the bonding wires  51  drawn out from the semiconductor chip  5  and the contact portions  11  and  12 . With the arrangement, the lower surface of the semiconductor device  5  can also be protected from an external magnetic field, thereby allowing the semiconductor device according to the present embodiment to operate well. Note that the width of the lower shield plate  3  in the second direction may be almost the same as that of the upper shield plate  7  in the second direction, as long as a main portion of the semiconductor chip  5  is protected. 
       Method for Producing Semiconductor Device According to First Embodiment 
       [0046]    Next, a method for producing the semiconductor device according to the present embodiment is described.  FIGS. 3, 5, and 8  are plan views schematically illustrating a method for producing the semiconductor device according to the present embodiment,  FIGS. 4( a ), 6( a ), and 9( a )  are cross-sectional views taken along the line I-I′ in  FIGS. 3, 5, and 8 , respectively, and  FIGS. 4( b ), 6( b ), and 9( b )  are cross-sectional views taken along the line II-II′ in  FIGS. 3, 5, and 8 , respectively.  FIG. 7  is cross-sectional views illustrating the method for producing the semiconductor device according to the present embodiment. 
         [0047]    In the method for producing the semiconductor device according to the present embodiment, first, the substrate  1  on which the wires (not illustrated) and the contact portions  11  are provided is prepared as illustrated in  FIGS. 3 and 4 . The substrate  1  is a rectangle whose longitudinal direction is the first direction and whose width direction is the second direction. The contact portions  11  are provided along the longitudinal direction so that a predetermined space is formed in the width direction. The lower shield plate  3  extending in the first direction is placed in two spaces formed between the contact portions  11  of the substrate  1  in the width direction and are then adhered by using the first adhesive  2 . 
         [0048]    In the present embodiment, the lower shield plate  3  is placed on the substrate  1  in a state where the first adhesive  2  is attached or applied onto a rear surface of the lower shield plate  3 . However, for example, the first adhesive  2  may be applied to the substrate  1  side. 
         [0049]    Next, as illustrated in  FIGS. 5 and 6 , the semiconductor chip  5  is mounted on the lower shield plate  3 . The semiconductor chip  5  is placed on the lower shield plate  3  so that the contact portions  12  provided on the upper surface of the semiconductor chip  5  correspond to the contact portions  11  provided on the substrate  1 . In the present embodiment, the second adhesive  4  is attached or applied onto the lower surface of the semiconductor chip  5 , and then semiconductor chip  5  is placed on the lower shield plate  3 . However, for example, the semiconductor chip  5  may be placed on the lower shield plate  3  onto which the second adhesive  4  has been attached or applied. 
         [0050]    Next, the contact portions  12  of the semiconductor chip  5  and the contact portions  11  of the substrate  1  are electrically connected to each other via the bonding wires  51 . In the present embodiment, the width of the semiconductor chip  5  in the second direction is almost the same as that of the lower shield plate  3  in the second direction. This makes it possible to prevent contact between the bonding wires  51  drawn out from the semiconductor chip  5  and the lower shield plate  3 . 
         [0051]    Next, as illustrated in  FIG. 7 , the first insulating resin  6  that has a predetermined thickness and includes a thermosetting resin is formed on one surface of the upper shield plate  7 . In the present embodiment, a thermosetting acrylic resin is used as the first insulating resin  6 , but various materials having plasticity such as ultraviolet curable resin can be used. 
         [0052]    Next, as illustrated in  FIGS. 8 and 9 , the upper shield plate  7  is pressed against the semiconductor device  5  so that the surface on which the first insulating resin  6  is formed faces the semiconductor device  5  and so that the upper shield plate  7  avoids the contact portions  12  and the bonding wires  51 . The lower shield plate  3  and the upper shield plate  7  are made in contact with each other via the side wall portion  32  extending from the lower shield plate  3  to the upper shield plate  7 . In this step, the upper shield plate  7  is placed in a space between the contact portions  12  on the upper surface of the semiconductor chip  5 . As a result of this step, the upper surface of the lower shield plate  3 , both side surfaces of the side wall portion  32 , and the semiconductor chip  5  are embedded in the first insulating resin  6 . 
         [0053]    The first insulating resin  6  is within a region directly below the upper shield plate  7  in  FIGS. 9( a ) and 9( b ) , but it is estimated that actually, the first insulating resin  6  is pushed out from side surfaces of the upper shield plate  7  and expands onto the upper surface of the semiconductor chip  5  and the like. In view of this, it is possible that the thickness of the first insulating resin  6  be set equal to or smaller than a distance between the upper surface of the lower shield plate  3  and an upper end of the side wall portion  32 . Furthermore, it is possible that part of the first insulating resin  6  that has expanded be removed, and it is possible that a difference in height be created in advance between a portion that makes contact with the upper surface of the semiconductor chip  5  and a portion that makes contact with the upper surface of the lower shield plate  3 . 
         [0054]    Next, the first insulating resin  6  is cured by heat or the like. Furthermore, all of these members are embedded in the second insulating resin  9 . As a result, the semiconductor device according to the present embodiment is produced as illustrated in  FIGS. 1 and 2 . 
         [0055]    In the present embodiment, the width of the upper shield plate  7  in the second direction is smaller than that of the semiconductor device  5  in the second direction and that of the lower shield plate  3  in the second direction. This makes it possible to suitably prevent contact between the bonding wires  51  and the upper shield plate  7 . 
         [0056]    According to the method for producing the semiconductor device according to the present embodiment, the upper shield plate  7  having, on the rear surface thereof, the first insulating resin  6  that has a predetermined thickness and is made of a thermosetting resin is pressed against the semiconductor chip  5 , so that the rear surface faces the semiconductor chip  5 , and the lower shield plate  3  and the upper shield plate  7  are made in contact with each other via the side wall portion  32  extending from the lower shield plate  3  to the upper shield plate  7 . Therefore, it is considered that the upper shield plate  7  and the lower shield plate  3  can be made in contact with each other better than, for example, in a case where the upper shield plate  7  having an adhesive layer formed on the rear surface thereof is adhered to the side wall portion  32  of the lower shield plate  3 . 
         [0057]    Furthermore, in this step, the upper surface of the lower shield plate  3 , both side surfaces of the side wall portion  32 , and the semiconductor chip  5  are embedded in the first insulating resin  6 . Accordingly, it is considered that filling of a resin is easier than, for example, in a case where the upper surface of the lower shield plate  3 , both side surfaces of the side wall portion  32 , and the semiconductor chip  5  are embedded after the upper shield plate  7  is adhered to the side wall portion  32  and the semiconductor chip  5 . Furthermore, the number of steps can be reduced as compared with such a method. 
         [0058]    Furthermore, in the present embodiment, the lower shield plate  3  has the side wall portion  32 , and the upper shield plate  7  has no side wall portion. Accordingly, the first insulating resin  6  can be easily formed on the lower surface of the upper shield plate  7 . However, for example, the upper shield plate  7  may have a side wall portion, or both of the lower shield plate  3  and the upper shield plate  7  may have a side wall portion. Furthermore, for example, it is possible that a contact area between the lower shield plate  3  and the upper shield plate  7  be increased by bending the upper end of the side wall portion  32 . 
       Semiconductor Device According to Second Embodiment 
       [0059]    Next, a configuration of a semiconductor device according to second embodiment is described.  FIG. 10  is a plan view schematically illustrating the semiconductor device according to first embodiment.  FIG. 11( a )  is a cross-sectional view taken along the line I-I′ in  FIG. 10 , and  FIG. 11( b )  is a cross-sectional view taken along the line II-II′ in  FIG. 10 . 
         [0060]    The semiconductor device according to second embodiment has a configuration that is basically almost the same as the semiconductor device according to first embodiment. However, the semiconductor device according to second embodiment is different from the semiconductor device according to first embodiment in that both ends of a lower shield plate  3  in the first direction are bent as illustrated in  FIGS. 10 and 11 . In other words, in the present embodiment, the lower shield plate  3  has two side wall portions  32 . These side wall portions  32  are in contact with a lower surface of the upper shield plate  7 . 
         [0061]    In the present embodiment, the lower shield plate  3  and the upper shield plate  7  function as a box-shaped magnetic shield that has no wall on sides facing each other (sides from which the bonding wires  51  are drawn out). In the semiconductor device according to the present embodiment, more pathways through which a magnetic field received by the lower shield plate  3  is transmitted to the upper shield plate  7  or a magnetic field received by the upper shield plate  7  is transmitted to the lower shield plate  3  are provided. This can make shielding performance higher than that in the semiconductor device according to first embodiment. 
         [0062]    Although the lower shield plate  3  has the two side wall portions  32  in the present embodiment, it is possible that the upper shield plate  7  have two side wall portions or it is, for example, possible that the lower shield plate  3  have a single side wall portion and the upper shield plate  7  have a single side wall portion. 
         [0063]    Next, a method for producing the semiconductor device according to second embodiment is described.  FIGS. 12, 14 , and  17  are plan views schematically illustrating a method for producing the semiconductor device according to the present embodiment,  FIGS. 13( a ), 15( a ), and 18( a )  are cross-sectional views taken along the line I-I′ in  FIGS. 12, 14, and 17 , respectively, and  FIGS. 13( b ), 15( b ), and 18( b )  are cross-sectional views taken along the line II-II′ in  FIGS. 12, 14, and 17 , respectively.  FIG. 16  is cross-sectional views illustrating the method for producing the semiconductor device according to the present embodiment. 
         [0064]    In the method for producing the semiconductor device according to the present embodiment, the lower shield plate  3  is placed on the substrate  1  and is then adhered by using a first adhesive  2  as in first embodiment as illustrated in  FIGS. 12 and 13 . The lower shield plate  3  according to the present embodiment is basically similar to the lower shield plate  3  according to first embodiment, but is different from the lower shield plate  3  according to first embodiment in that the lower shield plate  3  has two side wall portions  32 . 
         [0065]    Next, as illustrated in  FIGS. 14 and 15 , a semiconductor chip  5  is mounted on the lower shield plate  3  as in first embodiment. Next, contact portions  12  of the semiconductor chip  5  and contact portions  11  of the substrate  1  are electrically connected via the bonding wires  51  as in first embodiment. This makes it possible to prevent contact between the bonding wires  51  drawn out from the semiconductor chip  5  and the lower shield plate  3  as in first embodiment. 
         [0066]    Next, as illustrated in  FIG. 16 , a first insulating resin  6  is formed on one surface of the upper shield plate  7  as in first embodiment. Next, as illustrated in  FIGS. 17 and 18 , the upper shield plate  7  is pressed against the semiconductor device  5 , and the lower shield plate  3  and the upper shield plate  7  are made in contact with each other via the side wall portions  32  extending from the lower shield plate  3  to the upper shield plate  7  as in first embodiment. 
         [0067]    Next, the first insulating resin  6  is cured by heat or the like, and all the members are embedded in a second insulating resin  9  as in first embodiment. As a result of the above steps, the semiconductor device according to the present embodiment is produced as illustrated in  FIGS. 10 and 11 . 
         [0068]    In the present embodiment, the lower shield plate  3  has two side wall portions  32 . Accordingly, even if one of the side wall portions  32  is not in contact with the upper shield plate  7 , it is considered that the other one of the side wall portions  32  can be made in contact with the upper shield plate  7 . It is therefore possible to improve yield of magnetic shields. 
       Semiconductor Device According to Third Embodiment 
       [0069]    Next, a configuration of a semiconductor device according to third embodiment is described.  FIG. 19  is a plan view schematically illustrating a semiconductor device according to first embodiment.  FIG. 20( a )  is a cross-sectional view taken along the line I-I′ in  FIG. 19 , and  FIG. 20( b )  is a cross-sectional view taken along the line II-II′ in  FIG. 19 . 
         [0070]    The semiconductor device according to third embodiment has a configuration that is basically almost the same as the semiconductor device according to first embodiment. However, the semiconductor device according to the present embodiment is different from the semiconductor device according to first embodiment in that contact portions  11  are also provided in a portion of the substrate  1  that is exposed from the lower shield plate  3  in the first direction, and bonding wires  51  are also drawn out from a semiconductor chip  5  in the first direction and are connected to the contact portions  11  provided in the exposed portion. In the semiconductor device according to the present embodiment, even if the number of bonding wires  51  drawn out from the semiconductor chip  5  increases to a certain number or more, contact can be easily made. 
         [0071]    Next, a method for producing the semiconductor device according to third embodiment is described.  FIGS. 21, 23 , and  26  are plan views schematically illustrating a method for producing the semiconductor device according to the present embodiment,  FIGS. 22( a ), 24( a ), and 27( a )  are cross-sectional views taken along the line I-I′ in  FIGS. 21, 23, and 26 , respectively, and  FIGS. 22( b ), 24( b ), and 27( b )  are cross-sectional views taken along the line II-II′ in  FIGS. 21, 23, and 26 , respectively.  FIG. 25  is cross-sectional views illustrating the method for producing the semiconductor device according to the present embodiment. 
         [0072]    In the method for producing the semiconductor device according to the present embodiment, first the substrate  1  on which wires (not illustrated) and the contact portions  11  are provided is prepared as illustrated in  FIGS. 21 and 22 . The substrate  1  is almost the same as the substrate  1  according to first embodiment, but is different from the substrate  1  according to first embodiment in that the contact portions  11  are also provided in a portion exposed from the lower shield plate  3  in the first direction. The lower shield plate  3  is placed in a space surrounded on three sides by the contact portions  11  of the substrate  1  and is then adhered by using a first adhesive  2  as in first embodiment. 
         [0073]    Next, as illustrated in  FIGS. 23 and 24 , the semiconductor chip  5  is mounted on the lower shield plate  3 . The semiconductor chip  5  is placed on the lower shield plate  3  so that contact portions  12  provided on the upper surface of the semiconductor chip  5  correspond to the contact portions  11  provided on the substrate  1 . The semiconductor chip  5  according to the present embodiment is produced in almost the same manner as the semiconductor chip  5  according to first embodiment, but is different from the semiconductor chip  5  according to first embodiment in that the contact portions  12  are also formed in a portion of the upper surface that is in the vicinity of the exposed portion. Next, the contact portions  12  of the semiconductor chip  5  and the contact portions  11  of the substrate  1  are electrically connected to each other via the bonding wires  51 . 
         [0074]    Next, as illustrated in  FIG. 25 , a first insulating resin  6  is formed on one surface of the upper shield plate  7  as in first embodiment. Next, as illustrated in  FIGS. 26 and 27 , the upper shield plate  7  is pressed against the semiconductor device  5 , and the lower shield plate  3  and the upper shield plate  7  are made in contact with each other via a side wall portion  32  extending from the lower shield plate  3  to the upper shield plate  7  as in first embodiment. In this step, the upper shield plate  7  is placed in a space surrounded on three sides by the contact portions  12  on the upper surface of the semiconductor chip  5 . 
         [0075]    Next, the first insulating resin  6  is cured by heat or the like, and all the members are embedded in a second insulating resin  9  as in first embodiment. As a result of the above steps, the semiconductor device according to the present embodiment is produced as illustrated in  FIGS. 19 and 20 . 
       Semiconductor Storage Device According to Another Embodiment 
       [0076]    In each of the above embodiments, an upper end of the side wall portion  32  is substantially perpendicular to the upper shield plate  7 . However, for example, the upper end of the side wall portion  32  may be formed so as to form a surface substantially parallel with the upper shield plate  7  as illustrated in  FIG. 28 . Such a configuration can be easily accomplished just by bending a plate made of a magnetic substance when forming the lower shield plate  3 . According to such a configuration, it is possible to increase a contact area between the lower shield plate  3  and the upper shield plate  7 , thereby reducing magnetic resistance on a contact surface and increasing shield performance. 
         [0077]    Some embodiments of the present invention have been described above, but these embodiments are presented as examples and do not limit the scope of the present invention. These embodiments can be carried out in other various forms, and various kinds of omission, substitution, change can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope of the invention and included in the scope of the invention described in the claims and equivalents thereof. 
       REFERENCE SIGNS LIST 
       [0078]      1  . . . substrate,  2  . . . first adhesive,  3  . . . lower shieldplate,  4  . . . second adhesive,  5  . . . semiconductor device,  6  . . . first insulating resin,  7  . . . upper shieldplate,  9  . . . second insulating resin,  11 ,  12  . . . contact portions,  32  . . . side wall portion