Abstract:
A composite shaped article with uneven configuration junction face, comprising a resin member and a plate member composed of topside and underside arranged surface layer base materials integrated with a core layer base material interposed therebetween, the plate member and the resin member joined together with an uneven configuration at the side end faces facing each other. In the composite shaped article, the length of actual junction line formed along the unevenness of the uneven configuration is 1.05 mm or greater per mm of a protrusion passage line consisting of a continuity of line segment linking neighboring protrusion tops with each other in the uneven configuration drawn by the surface layer base materials.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a molded composite article and a production process thereof. A molded composite article according to one embodiment of the invention comprises a plate member and a resin member, wherein the plate member and the resin member are integrally bonded to each other at side end faces thereof facing each other. A molded composite article according to one embodiment of the invention can be preferably used as a material for forming parts of mobile electric and electronic devices such as portable personal computers and cell phones which are required to have a light weight, high strength, high stiffness and thin wall. A molded composite article according to one embodiment of the invention can be especially preferably used as a material for forming the housings of these devices. 
       BACKGROUND OF THE INVENTION 
       [0002]    Electric and electronic devices such as personal computers and telephone sets are increasingly provided as mobile devices. The parts constituting these devices are required to have a small size, light weight and thin wall and such mechanical properties as high strength and high stiffness. It is especially necessary that the housings of these devices do not bend at least partially to contact inside parts for breaking the inside parts or to break themselves in the case where external loads act on the housings. 
         [0003]    JP 2006-044259 A (Patent Literature 1) proposes a molded article for forming a housing. This molded article is an integrally molded article that uses a laminated member comprising numerous continuous reinforcing fibers arranged in one direction and a thermosetting resin (plate member) as a ceiling plate of the housing, wherein the ceiling plate is integrally bonded onto the top faces of the side frames formed of a thermoplastic resin including reinforcing fibers (resin member) of the housing by a thermoplastic resin composition (adhesive). This integrally molded article has an advantage that sufficient adhesion can be obtained between the ceiling plate and the side frames. However, the joints between the ceiling plate and the side frames are positioned on the top faces of the side frames, that is, the ceiling plate overlaps on the side frames, to form the joints. Therefore, the thickness of the ceiling plate at the joints prevents the housing from having a thin wall. 
         [0004]    JP 2007-038519 A (Patent Literature 2) proposes a molded composite article for forming a housing. The molded composite article comprises a plate member and a resin member, wherein the plate member and the resin member are integrally bonded to each other at side end faces thereof facing each other. The plate member has a three-layer structure comprising an upper layer, a lower layer and a core layer positioned between the upper and lower layers. That is, in this case, the molded composite article has a sandwich structure in which the core layer is kept between the upper and lower layers. The core layer is a soft member (for example, a foamed material), and the upper and lower layers are hard members (for example, a resin including reinforcing fibers). This molded composite article is produced by injection-molding a resin forming the resin member toward a side end face of the plate member. The resin injected by the injection molding partially penetrates like a projection into the core layer from the side end face of the core layer, to bond the plate member and the resin member to each other. 
         [0005]    This molded composite article is free from joint at which the plate member and the resin member overlap on each other, and the joint between both the members are positioned between side end faces of both the members, to allow the wall thickness of the housing to be reduced. However, in the case where the resin flowability is low during injection molding or in the case where a high injection pressure is not available, the projection-like penetration of the resin member into the core layer is insufficient, and it is difficult to obtain a sufficient bonding strength between the plate member and the resin member. Further, in this publicly known housing, the joint line between the side end face of the plate member and the side end face of the resin member are straight lines. Therefore, stress concentration is likely to occur at the joint, and for this reason, it is difficult to obtain a sufficient bonding strength. 
         [0006]    As described above, there still remains a demand for a technique that allows a wall thickness of a housing to be reduced and that can achieve a sufficient bonding strength between both the members. 
       Patent Literature 1: JP 2006-044259 A 
     Patent Literature 2: JP 2007-038519 A 
     SUMMARY OF INVENTION 
       [0007]    The invention provides a molded composite article having a light weight, high strength, high stiffness and thin wall. Further, the invention is intended to provide a molded composite article excellent in the bonding strength between a plate member and a resin member. The invention also provides a process for producing such a molded composite article. 
         [0008]    A molded composite article according to an embodiment of the invention is as described below. 
         [0009]    A molded composite article comprising a plate member and a resin member and having a bonding interface at which the plate member and the resin member are bonded to each other at side end faces thereof facing each other, in which the plate member comprises surface layer base materials positioned on the upper surface side and the lower surface side of the plate member and a core layer base material positioned between the both surface layer base materials; and the respective surface layer base materials are formed of a fiber-reinforced resin, while the core layer base material is formed of a soft material softer than the fiber-reinforced resin forming the respective surface layer base materials, wherein at least a partial bonding interface of the bonding interface is an undulating bonding interface at which undulating side end faces of the respective surface layer base materials and an undulating side end face of the resin member are bonded to each other; a length of an actual bonding line formed along an undulation of the undulating bonding interface is 1.05 mm or more per 1 mm length of a projection-connecting line consisting of straight line segments connecting crests of the respective projections adjacent to each other in an undulation form of the respective surface layer base materials; and at the undulating bonding interface, the resin member has a resin member penetrating tip portion that penetrates into a region between both the surface layer base materials. 
         [0010]    In the molded composite article of an embodiment of the invention, it is preferred that at least at the undulating bonding interface, the side end face of the resin member is formed to be flat excluding the resin member penetrating tip portion. 
         [0011]    In the molded composite article of an embodiment of the invention, it is preferred that at least at the undulating bonding interface, the thickness of the plate member is substantially equal to the thickness of the resin member. 
         [0012]    In the molded composite article of an embodiment of the invention, it is preferred that the thickness of the plate member is 0.7 to 1.5 mm. 
         [0013]    In the molded composite article of an embodiment of the invention, it is preferred that at the undulating bonding interface, the number of the projections in the undulation form of the respective surface layer base materials is 1 to 100 per 100 mm length of the projection-connecting line. 
         [0014]    In the molded composite article of an embodiment of the invention, it is preferred that at the undulating bonding interface, if the distance from the projection-connecting line to a recess bottom of each of the recesses Pn in the undulation form of the respective surface layer base materials is a recess depth Ln, and the distance between both the ends of a recess opening line of the recess Pn formed as a line segment of the projection-connecting line within a form of the recess is a recess opening width Fn, then the recess depth Ln is 0.1 to 10 times the recess opening width Fn. 
         [0015]    In the molded composite article of an embodiment of the invention, the recess Pn may contain a roundish line segment in the profile line of the recess form. 
         [0016]    In the molded composite article of an embodiment of the invention, the recess Pn may have a portion wider than the recess opening width Fn. 
         [0017]    In the molded composite article of an embodiment of the invention, the form of the recess Pn may also be substantially polygonal. 
         [0018]    In the molded composite article of an embodiment of the invention, it is preferred that reinforcing fibers in the fiber-reinforced resin forming the respective surface layer base materials are carbon fibers. 
         [0019]    In the molded composite article of an embodiment of the invention, it is preferred that a matrix resin in the fiber-reinforced resin forming the respective surface layer base materials is a resin containing a thermosetting resin. 
         [0020]    In the molded composite article of an embodiment of the invention, it is preferred that the soft material forming the core layer base material is at least one material selected from the group consisting of foams, honeycomb materials, fiber sheets and resin sheets. 
         [0021]    In the molded composite article of an embodiment of the invention, it is preferred that the resin member is formed of a fiber-reinforced resin. 
         [0022]    In the molded composite article of an embodiment of the invention, it is preferred that reinforcing fibers in the fiber-reinforced resin forming the resin member are glass fibers or carbon fibers. 
         [0023]    A process for producing a molded composite article according to one embodiment of the invention is as follows. 
         [0024]    A process for producing a molded composite article according to one aspect of the invention comprises the steps of: 
         [0025]    (a) preparing a plate member having an undulation form formed at one side end face of a plate-like body comprising surface layer base materials formed of a fiber-reinforced resin and positioned on the upper surface side and the lower surface side and a core layer base material formed of a material softer than the fiber-reinforced resin and positioned between both the surface layer base materials, by forming multiple grooves at the end face inward into the surface layer base materials, 
         [0026]    (b) accommodating the prepared plate member in a mold of an injection molding machine, and 
         [0027]    (c) injecting a resin at least toward the end face having an undulation form of the plate member in the injection molding machine having the plate member accommodated in the mold, to ensure that the resin can be bonded to the end face having the undulation form of the plate member and that the resin can penetrate into a region between both the surface layer base materials. 
         [0028]    In the process for producing a molded composite article in an embodiment of the invention, it is preferred that in the injecting step, the resin is injected to ensure that the thickness of the plate member and the thickness of the resin member can be substantially equal to each other after completion of molding at least at a joint having the undulation form between the plate member and the resin bonded thereto. 
         [0029]    In aspects of a molded composite article according to the invention, a plate member and a resin member as components of the molded composite article are bonded to each other via an undulation form at least at a partial bonding interface of a bonding interface between the members. Therefore, the molded composite article can have a thinner wall, lighter weight, higher stiffness and higher strength. The molded composite article can be suitably used as members for forming housings of mobile electric and electronic devices such as portable personal computers and cell phones. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0030]      FIG. 1  is a perspective sectional view showing an embodiment of the molded composite article of the invention. 
           [0031]      FIG. 2  is a perspective sectional view showing the plate member of the molded composite article shown in  FIG. 1 . 
           [0032]      FIG. 3  is an exploded perspective view showing an example of plate-like base materials used for forming the plate member of the molded composite article shown in  FIG. 1 . 
           [0033]      FIG. 4  is a perspective sectional view showing an example of the conventional molded composite article. 
           [0034]      FIG. 5  is a perspective sectional view showing another example of the conventional molded composite article. 
           [0035]      FIG. 6  is a plan view showing an example of the undulating bonding interface in the molded composite article of the invention. 
           [0036]      FIG. 7  is a plan view showing another example of the undulating bonding interface in the molded composite article of the invention. 
           [0037]      FIG. 8  is a plan view showing a further example of the undulating bonding interface in the molded composite article of the invention. 
           [0038]      FIG. 9  is a plan view showing a still further example of the undulating bonding interface in the molded composite article of the invention. 
           [0039]      FIG. 10  is plan views showing seven form examples of each recess in the undulating bonding interface of the molded composite article of the invention. 
       
    
    
     REFERENCE SIGNS LIST 
       [0000]    
       
         
           
               10 : molded composite article of the invention 
               10 E: left side edge 
               10 E 2 : right side edge 
               10 E 3 : upper side edge 
               11 : plate member 
               11 SF: side end face of plate member 
               11 A: crude base material of plate member 
               11 Aa,  11 Ab,  11 Ba,  11 Bb: continuous reinforcing fiber sheet 
               12 : resin member 
               12 SF: side end face of resin member 
               13 JF,  13 JF 2 ,  13 JF 3 : bonding end face 
               13 JL,  13 JL 2 ,  13 JL 3 : bonding line 
               13 PL: projection-connecting line 
               15   a ,  15   b : surface layer base material 
               15   a A: surface layer base material of upper surface side 
               15   b A: surface layer base material of lower surface side 
               16 : core layer base material 
               16 A: core layer base material 
               18 : tip portion of resin member 
               19 : vertical wall of resin member 
               31 Aa,  31 Ab,  31 Ba,  31 Bb: continuous reinforcing fibers 
               40 : conventional molded composite article 
               50 : conventional molded composite article 
               101 : plate member 
               101 SF: side end face of plate member 
               101 T: thickness of plate member 
               102 : resin member 
               102 SF: side end face of resin member 
               102 T: thickness of resin member 
               103 JF: bonding interface 
               103 JL: bonding line 
               104 SE 1 : one side of molded composite article 
               105   a ,  105   b : surface layer base material 
               106 : core layer base material 
               107 : bonding projection 
               108 : tip portion of resin member 
             Fn: recess opening width 
             JL: bonding line 
             Ln: recess depth 
             PAn: projection of surface layer base material 
             PL: projection-connecting line 
             Pn: recess of surface layer base material 
           
         
       
     
       DETAILED DESCRIPTION OF THE INVENTION 
       [0082]    Embodiments of conventional molded composite articles and embodiments of molded composite articles according to the invention are explained below in reference to the drawings. 
         [0083]      FIGS. 4 and 5  are perspective sectional views showing respectively different embodiments of the conventional molded composite articles. Since the embodiments are similar to each other, the same components are given the same symbols in  FIGS. 4 and 5 . 
         [0084]    In  FIGS. 4 and 5 , a molded composite article  40  or  50  comprises a plate member  101  and a resin member  102 . The plate member  101  and the resin member  102  are bonded to each other at a side end face  101 SF of the plate member  101  and a side end face  102 SF of the resin member  102  facing each other, to form a bonding interface  103 JF. The bonding interface  103 JF is shown as a bonding line  103 JL on a surface of the molded composite article  40  or  50 . The bonding line  103 JL is a straight line. The direction of the straight line is usually in parallel to the direction of one side  104 SE 1  of the molded composite article  40  or  50 . Owing to this constitution, in case of indicating a length on the bonding line  103 JL, a wording of a parallel direction length may be used. 
         [0085]    The plate member  101  comprises surface layer base materials  105   a  and  105   b  positioned on the upper surface side and the lower surface side, and a core layer base material  106  positioned between these surface layer base materials  105   a  and  105   b . The respective surface layer base materials  105   a  and  105   b  are formed of a fiber-reinforced resin. The fiber-reinforced resin comprises numerous continuous reinforcing fibers arranged in one direction and a matrix resin. The core layer base material  106  is formed of a soft material softer than the fiber-reinforced resin forming the respective surface layer base materials  105   a  and  105   b . As the soft material, foam is used. The soft material of the core layer base material  106  is used to ensure that when a resin for forming the resin member  102  is injection-molded toward the plate member  101 , the resin for forming the resin member  102  can compress the core layer base material  106  and penetrate into a region between both the surface layer base materials  105   a  and  105   b.    
         [0086]    In the molded composite article  40  of  FIG. 4 , at the bonding interface  103 JF, the side end face  102 SF of the resin member  102  does not penetrate into the region between both the surface layer base materials  105   a  and  105   b . As a result, for the purpose of reinforcing the bonding strength between the plate member  101  and the resin member  102  at the bonding interface  103 JF, a bonding projection  107  for supporting the plate member  101  from below is provided for the side end face  102 SF of the resin member  102  at the region of the bonding interface  103 JF. For this reason, in the molded composite article  40 , the thickness  102 T of the resin member  102  is larger than the thickness  101 T of the plate member  101 . As a result, the molded composite article  40  is disadvantageous in view of weight reduction. 
         [0087]    In the molded composite article  50  of  FIG. 5 , at the bonding interface  103 JF, the side end face  102 SF of the resin member  102  penetrates into a region between both the surface layer base materials  105   a  and  105   b . The penetration of the resin member  102  causes a tip portion  108  of the resin member  102  to be positioned in a space formed by the core layer base material  106  receding in the penetration direction. That is, the tip portion  108  of the resin member  102  is positioned between both the surface layer base materials  105   a  and  105   b . As a result, a certain bonding strength can be secured between the plate member  101  and the resin member  102  at the bonding interface  103 JF. However, in the molded composite article  50 , since the bonding line  103 JL is a straight line, the penetration of the resin member  101  into the plate member  102  occurs only in the core layer base material  106 , and it cannot be expected that the bonding strength between the plate member  101  and the resin member  102  is further enhanced. 
         [0088]    An embodiment of the molded composite article of the invention is explained below in reference to  FIGS. 1 and 2 . 
         [0089]      FIG. 1  is a perspective sectional view showing an embodiment of the molded composite article of the invention.  FIG. 2  is a perspective sectional view showing the plate member used in the molded composite article of  FIG. 1 . 
         [0090]    In  FIG. 1 , a molded composite article  10  of the invention comprises a plate member  11  and a resin member  12 . The plate member  11  and the resin member  12  are bonded to each other between an undulating side end face  11  SF of the plate member  11  and an undulating side end face  12 SF of the resin member  12  facing each other, to form a bonding interface  13 JF as an undulating bonding interface. The bonding interface  13 JF appears as a bonding line  13 JL on a surface of the molded composite article  10 . Since the bonding interface  13 JF has an undulation form, the bonding line  13 JL is an undulating curve. 
         [0091]    The plate member  11  comprises a surface layer base material  15   a  positioned on the upper surface side, a surface layer base material  15   b  positioned on the lower surface side and a core layer base material  16  positioned between these surface layer base materials  15   a  and  15   b . The respective surface layer base materials  15   a  and  15   b  are formed of a fiber-reinforced resin. The core layer base material  16  is formed of a soft material softer than the fiber-reinforced resin forming the respective surface layer base materials  15   a  and  15   b . The soft material of the core layer base material  16  is used to ensure that when a resin for forming the resin member  12  is injection-molded toward the plate member  11 , the resin for forming the resin member  12  can compress the core layer base material  16  and penetrate into a region between both the surface layer base materials  15   a  and  15   b . That is, a tip portion  18  of the resin member  12  is positioned between both the surface layer base materials  15   a  and  15   b  of the plate member  11 . 
         [0092]    The molded composite article  10  has bonding interfaces  13 JF 2 ,  13 JF 3  and  13 JF 4  in addition to the bonding interface  13 JF between the plate member  11  and the resin member  12 . However, the bonding interface  13 JF 4  does not appear in  FIG. 1 , since  FIG. 1  is a sectional view. The respective bonding interfaces appear as bonding lines  13 JL 2 ,  13 JL 3  and  13 JL 4  in addition to the bonding line  13 JL on the surface of the molded composite article  10 . However, the bonding line  13 JL 4  does not appear in  FIG. 1 , since  FIG. 1  is a sectional view. The molded composite article  10  has a left side edge  10 E, right side edge  10 E 2 , upper side edge  10 E 3  and lower side edge  10 E 4  in  FIG. 1 . However, the lower side edge  10 E 4  does not appear in  FIG. 1 , since  FIG. 1  is a sectional view. 
         [0093]    The direction of the left side edge  10 E and the direction of the right side edge  10 E 2  are parallel to each other, and further, the direction of the upper side edge  10 E 3  and the direction of the lower side edge  10 E 4  are parallel to each other. The direction of the bonding line  13 JL 2  and the direction of the right side edge  10 E 2  are parallel to each other, and the direction of the bonding line  13 JL 3  and the direction of the upper side edge  10 E 3  are parallel to each other. The direction of the bonding line  13 JL 4  and the direction of the lower side edge  10 E 4  are parallel to each other. The bonding line  13 JL having an undulating form progresses with undulation and the progress direction is parallel to the direction of the left side edge  10 E. Owing to this constitution, in case of indicating a length on the bonding line, a wording of a parallel direction length may be used. 
         [0094]    In the molded composite article  10 , a length JL of the actual bonding line formed along the undulation of the undulation form of the undulating bonding interface  13 JF, i.e., a length of the bonding line  13 JL is 1.05 mm or more per 1 mm length of a projection-connecting line  13 PL consisting of straight line segments connecting crests of the respective projections adjacent to each other in the undulation form of the respective surface layer base materials  15   a  and  15   b . This value indicates the degree of undulation. 
         [0095]    The projection-connecting line  13 PL is usually a straight line. Further, in the case where the projection-connecting line  13 PL is a straight line, the direction of the projection-connecting line  13 PL is usually the same as the direction of the left side edge  10 E. That is, the projection-connecting line  13 PL is a straight line parallel to the left side edge  10 E. Since the bonding line  103 JL of the molded composite article  40  shown in  FIG. 4  or of the molded composite article  50  shown in  FIG. 5  is not a curve of undulation, but a straight line, the length of the actual bonding line and the length of the bonding line  103 JL are equal to each other. 
         [0096]    In the molded composite article  10 , since the bonding interface  13 JF has such an undulation form, the bonding strength at the bonding interface is remarkably higher than that of the molded composite article  40  or  50  shown in  FIG. 4  or  5  in which the bonding interface is a flat face. In the molded composite article  10 , other bonding interfaces  13 JF 2 ,  13 JF 3  and  13 JF 4  can also be undulating bonding interfaces like the bonding interface  13 JF as required. 
         [0097]    The size of the core layer base material  16  formed of a soft material can also be adjusted to ensure that the side end face of the core layer base material  16  may be positioned somewhat inside compared with the positions of the side end faces of the respective surface layer base materials  15   a  and  15   b . In this constitution, the size of the tip portion  18  of the resin member  12  can be adjusted in response to the softness of the core layer base material  16 , the injection pressure and the resin used to form the resin member  12 . 
         [0098]      FIG. 3  is an exploded perspective view showing a crude laminate used to prepare the plate member  11  of the molded composite article  10  of  FIG. 1 . In  FIG. 3 , a crude laminate  11 A comprises a core layer base material  16 A formed of foam as a soft material, a continuous reinforcing fiber sheet  11 Aa with numerous fibers arranged in parallel in one direction disposed on the upper surface of the core layer base material  16 A, a continuous reinforcing fiber sheet  11 Ab with numerous fibers arranged in parallel in one direction disposed on the lower surface of the core layer base material  16 A, a continuous reinforcing fiber sheet  11 Ba with numerous fibers arranged in parallel in one direction disposed on the upper surface of the continuous reinforcing fiber sheet  11 Aa, and furthermore a continuous reinforcing fiber sheet  11 Bb with numerous fibers arranged in parallel in one direction disposed on the lower surface of the continuous reinforcing fiber sheet  11 Ab. 
         [0099]    The direction in which continuous reinforcing fibers  31 Aa are arranged in the continuous reinforcing fiber sheet  11 Aa is perpendicular to the direction in which continuous reinforcing fibers  31 Ba are arranged in the continuous reinforcing fiber sheet  11 Ba. These continuous reinforcing fiber sheets form a surface layer base material  15   a A on the upper surface side. Further, the direction in which continuous reinforcing fibers  31 Ab are arranged in the continuous reinforcing fiber sheet  11 Ab is perpendicular to the direction in which continuous reinforcing fibers  31 Bb are arranged in the continuous reinforcing fiber sheet  31 Bb. These continuous reinforcing fiber sheets form a surface layer base material  15   b A on the lower surface side. 
         [0100]    The method for bonding both the surface layer base materials  15   a A and  15   b A to the core layer base material  16 A is not especially limited. For example, a method of holding an adhesive nonwoven fabric or film between each of both the surface layer base materials  15   a A and  15   b A and the core layer base material  16 A and press-molding can be suitably used. Otherwise, for example, a method of applying an adhesive between each of both the surface layer base materials  15   a A and  15   b A and the core layer base material  16 A can also be used. 
         [0101]    The method for producing the plate member  11  using the crude laminate  11 A of the plate member is not especially limited. For example, a press molding method, hand lay-up molding method, spray-up molding method, vacuum bag molding method, pressure molding method, autoclave molding method, transfer molding method, etc. respectively using a thermosetting resin can be used. Furthermore, for example, a press molding method or stamping method respectively using a thermoplastic resin can also be used. Above all, in view of processability and mechanical properties, a vacuum bag molding method, press molding method and transfer molding method can be suitably used. 
         [0102]    The method for bonding the resin member  12  to the plate member  11  is not especially limited. However, a method comprising the steps of setting the plate member  11  in a mold of an injection molding machine, clamping the mold and injection-molding a resin for forming the resin member  12  can be suitably used. Otherwise, for example, a method of preparing the plate member  11  and the resin member  12  respectively separately and bonding them to each other using an adhesive can also be used. 
         [0103]    In the molded composite article  10 , the length of the bonding line  13 JL is 1.05 mm or more per 1 mm length of the projection-connecting line  13 PL consisting of straight line segments connecting the crests of the respective projections adjacent to each other in the undulation form of the respective surface layer base materials  15   a  and  15   b . In the case where the length of the bonding line  13 JL is 1.05 mm or more per 1 mm length of the projection-connecting line  13 PL at the bonding interface  13 JF, the load acting on the bonding interface  13 JF, if any, can be dispersed to remarkably enhance the bonding strength compared with the case where the length of the bonding line  13 JL is less than 1.05 mm. 
         [0104]    It is preferred that the length of the bonding line  13 JL per 1 mm length of the projection-connecting line  13 PL is 1.10 mm or more, and more preferred is 1.15 mm or more. Meanwhile, if the length of the bonding line  13 JL is longer, the bonding strength tends to be higher. However, even if the length is elongated to more than required, there is a limit to the enhancement of bonding strength and the processing of the plate member or the processing of the respective surface layer base materials becomes difficult. Considering these matters, it is preferred that the length of the bonding line  13 JL per 1 mm length of the projection-connecting line  13 PL is 5 mm or less. More preferred is 4 mm or less. 
         [0105]    The method for preparing the undulation form at the side end face  11 SF of the plate member or the respective surface layer base materials is not especially limited. However, a numerically controlled end mill or milling cutter or the like can be used for processing even a complicated undulation form. 
         [0106]    It is preferred that the number of projections PAn in the undulation form of the respective surface layer base materials  15   a  and  15   b  at the bonding interface  13 JF is 1 to 100 per 100 mm length of the projection-connecting line  13 PL. In this case, if the distance from the projection-connecting line  13 PL to the recess bottom of each recess Pn formed between the respectively adjacent projections is a recess depth Ln, it is preferred that the recess depth Ln is 0.5 to 100 mm. 
         [0107]    It is more preferred that the number of projections PAn is 3 to 80 per 100 mm length of the projection-connecting line  13 PL. In this case, it is more preferred that the recess depth Ln is 1 to 80 mm. 
         [0108]    It is further more preferred that the number of projections PAn is 5 to 60 per 100 mm length of the projection-connecting line  13 PL. In this case, it is further more preferred that the recess depth Ln is 2 to 60 mm. 
         [0109]    If the number of projections PAn is less than 1 per 100 mm length of the projection-connecting line  13 PL and the recess depth Ln is less than 0.5 mm, then in the case where the bonding length is short and where a load acts on the bonding interface  13 JF, the bonding strength may be insufficient since the load cannot be dispersed. Further, if the number of projections PAn is more than 100 per 100 mm length of the projection-connecting line  13 PL and the recess depth Ln is more than 100 mm, it may be difficult to process the plate member  11  or the surface layer base materials  15   a  and  15   b , or processing time and cost may increase. 
         [0110]      FIGS. 6 through 9  are plan views showing some undulating bonding interfaces with respectively different undulations to be formed at the side end faces of the surface layer base materials. In  FIGS. 6 through 9 , symbol JL denotes a bonding line at which the resin member bonds. Symbol PAn and Symbol PAn+1 denote projections adjacent to each other. Symbol Pn denotes a recess formed between the projections PAn and PAn+1 adjacent to each other. Symbol PL denotes the projection-connecting line consisting of straight line segments connecting the crests of the projections PAn and PAn+1 respectively adjacent to each other. Symbol Ln denotes the distance from the projection-connecting line PL to the recess bottom of each recess Pn, i.e., recess depth. Symbol Fn is the distance between both the ends of the recess opening line formed as a line segment of the projection-connecting line PL within the form of each recess Pn, i.e., the recess opening width. 
         [0111]    It is preferred that the recess depth Ln is 0.1 to 10 times the recess opening width Fn. A more preferred range is 0.5 to 8 times, and a further more preferred range is 1 to 5 times. If the recess depth Ln is less than 0.1 time the recess opening width Fn, the bonding strength may be insufficient since the load is unlikely to be dispersed in the case where the load in parallel to the bonding interface acts on the bonding interface. Meanwhile, it is assumed that the abovementioned relationship between the recess depth Ln and the recess opening width Fn is satisfied by at least 90% or more of all the number N (n=1, 2, 3, . . . N) of projections. 
         [0112]    It is preferred that the profile line of the recess form of each recess Pn partially contains a roundish line segment. If each recess Pn contains a roundish line segment, the length of the actual bonding line JL can be elongated, and the stress concentration likely to occur in the case where there is a sharp portion can be prevented. 
         [0113]    Each recess Pn may have a portion wider than the recess opening width Fn. In the case of the recess Pn shown in  FIG. 9 , the right bonding line segment JL and the left bonding line segment JL of the recess Pn become distant from each other as they extend toward the bottom of the recess Pn. That is, the recess Pn of  FIG. 9  has a portion wider than the recess opening width Fn. If the recess Pn has a portion wider than the recess opening width Fn, in the case where a tensile force acts in the direction perpendicular to the bonding interface JF, an anchor effect can be enlarged. 
         [0114]    Plan views of other seven examples of the recess Pn having a portion wider than the recess opening width Fn are shown in  FIG. 10(   a ) through ( g ). The form of the recess Pn of  FIG. 10(   a ) is a liquid drop form. The form of the recess Pn of  FIG. 10(   b ) is a musical note form. The form of the recess Pn of  FIG. 10(   c ) is a pendulum form. The form of the recess Pn of  FIG. 10(   d ) is a dovetail groove form or T letter form. The form of the recess Pn of  FIG. 10(   e ) is key-like form or L letter form. The form of the recess Pn of  FIG. 10(   f ) is a tail form or J letter form. The form of the recess Pn of  FIG. 10(   g ) is a polygonal form typified by a diamond or kite. 
         [0115]    The surface layer base materials  15   a  and  15   b  of the plate member  11  are formed of a fiber-reinforced resin, and a resin used therein, i.e., a matrix resin is a thermoplastic resin or thermosetting resin. 
         [0116]    Examples of the thermoplastic resin include polyolefins such as polyethylene (PE), polypropylene (PP) and polybutylene, styrene-based resins such as polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS) and acrylonitrile-styrene copolymer (AS), polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN) and liquid crystal polyesters, polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyphenylene ether (PPE), modified PPE, thermoplastic polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU), modified PSU, polyethersulfone (PES), polyketone (PK), polyetherketone (PEK), polyetheretherketone (PEEK), polyether ketone ketone (PEKK), polyarylate (PAR), polyether nitrile (PEN), thermoplastic phenol-based resins, phenoxy resin, fluorine resins such as polytetrafluoroethylene (PTFE), further, polystyrene-based, polyolefin-based, polyurethane-based, polyester-based, polyamide-based, polybutadiene-based, polyisoprene-based and fluorine-based thermoplastic elastomers, copolymers and modification products thereof, blends and polymer alloys comprising two or more of the foregoing, etc. 
         [0117]    Examples of the thermosetting resin include unsaturated polyester, vinyl ester, epoxy, phenol (resol type), urea-melamine, polyimide, etc., copolymers and modification products thereof, and polymer alloys consisting of at least two of the foregoing. 
         [0118]    As the matrix resin, a thermosetting resin excellent in stiffness and strength is preferred, and a thermosetting resin mainly composed of an epoxy resin is more preferred in view of the mechanical properties of the molded article. For further higher impact resistance, a thermoplastic resin and/or any other elastomer or rubber component can also be added to the thermosetting resin. 
         [0119]    Examples of the reinforcing fibers used include inorganic fibers, for example, metal fibers such as aluminum fibers, brass fibers and stainless steel fibers, carbon fibers such as polyacrylonitrile-based, rayon-based, lignin-based and pitch-based carbon fibers, graphite fibers, glass fibers, silicon carbide fibers and silicon nitride fibers, and organic fibers such as aramid fibers, polypara-phenylene-benzobisoxazole (PBO) fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers and polyethylene fibers. Any one type of these reinforcing fibers can be used or two or more types can also be used together. 
         [0120]    In view of the balance among specific strength, specific stiffness and light weight, carbon fibers are preferred as the reinforcing fibers, and in view of excellent specific strength and specific modulus, it is preferred to contain at least polyacrylonitrile-based carbon fibers. 
         [0121]    The reinforcing fibers of the respective surface layer base materials  15   a  and  15   b  can also be a reinforcing fiber sheet comprising multiple layers containing reinforcing fibers. It is preferred that the reinforcing fibers are continuous reinforcing fibers, since higher strength and higher stiffness can be obtained. The length of the continuous reinforcing fibers in a reinforcing fiber sheet containing the continuous reinforcing fibers is only required to be 10 mm or more. However, it is not necessarily required that the reinforcing fibers are continuous throughout the entire reinforcing fiber sheet and can also remain cut intermediately. The mode of the continuous reinforcing fibers can be, for example, cloth, unidirectional fiber sheet or braid. In view of processability, cloth or unidirectional fiber sheet can be suitably used. Any one of these modes can be used alone or two or more of them can also be used together. Above all, a sheet with multifilaments arranged in parallel in one direction is preferred, since strength and stiffness can be obtained more efficiently. 
         [0122]    In the case where a sheet containing reinforcing fibers is used as a surface layer base material, it is preferred that the rate of the reinforcing fibers is 20 to 90 vol % in view of moldability and mechanical properties. A more preferred range is 30 to 80 vol %. Meanwhile, in the case where the matrix is a resin, the vol % is measured according to the method described in JIS K 7075-1991 (Fiber Content and Void Content Testing Methods for Carbon Fiber Reinforced Plastics). 
         [0123]    The resin used in the resin member  12  is not especially limited, but a thermoplastic resin can be preferably used in view of the preparation of the bonding form by using injection molding, etc. 
         [0124]    As the thermoplastic resin used for forming the resin member, any of the abovementioned thermoplastic resins used for forming the plate member can be used. Among them, especially in view of heat resistance and chemicals resistance, polyphenylene sulfide (PPS) can be preferably used, and in view of the appearance and dimensional stability of the molded article, polycarbonate (PC) and polyphenylene ether (PPE) or styrene-based resin can be preferably used. Further, in view of the strength and impact resistance of the molded article, polyamide (PA) can be preferably used. 
         [0125]    For obtaining a molded composite article having higher strength and higher stiffness, it is also preferred to use a resin containing reinforcing fibers as the resin of the resin member  12 . As the reinforcing fibers, the abovementioned reinforcing fibers can be enumerated. In the case where the resin member  12  requires radio wave transmission, it is also preferred to use non-conductive glass fibers as the reinforcing fibers. 
         [0126]    As the soft material forming the core layer base material  16  of the plate member  11 , for example, a porous material such as foam or honeycomb material, fiber sheet or resin sheet can be used. If foam and/or a honeycomb material is used, a plate member  11  having a lighter weight can be obtained. 
         [0127]    The material of the soft material is not especially limited. In the case where the soft material is a thermoplastic resin, any of the abovementioned thermoplastic resins used for forming the plate member can be used. Among them, especially in view of lighter weight, a polyolefin-based resin such as polypropylene (PP) or polyethylene (PE) can be preferably used, and in view of the adhesion between the respective surface layer base materials  15   a  and  15   b  and the resin member  12 , a polyamide-based resin, polyester-based resin, polyvinyl alcohol-based resin, modified polyolefin, or a copolymer or polymer alloy thereof can be preferably used. 
         [0128]    In the case where it is desired to let the core layer base material  16  have some stiffness, the soft material may also contain reinforcing fibers such as glass fibers or carbon fibers. 
         [0129]    The method for bonding the respective surface layer base materials  15   a  and  15   b  and the core layer base material  16  to each other is not especially limited. An adhesive nonwoven fabric, film or the like may be interposed between each of the surface layer base materials and the core layer base material, for bonding, or either or both of the base materials may also be coated with an adhesive for bonding. 
         [0130]    The molded composite article of the invention can be applied, for example, to the components of the housings of electric and electronic devices such as personal computers, displays, OA devices, cell phones, portable information terminals, facsimiles, compact disc players, portable MD players, portable radio cassettes, PDA (portable information terminals such as electronic organizers), digital video cameras, digital still cameras, optical devices, audio devices, air conditioners, illumination devices, amusement articles, toys and other household electric appliances. Further, it can also be applied to components of trays, chassis and cases, components of various mechanical parts, and components of electric equipment members and internal parts of automobiles and aircraft. 
         [0131]    Above all, the molded composite article of the invention can be suitably used as the components of the housings of electric and electronic devices since the molded composite article has a light weight, high strength, high stiffness and thin wall. Further, it can be suitably used as the components of the housings of notebook personal computers and portable information terminals requiring thin-walled wide displays. 
         [0132]    Depending on applications, it is preferred that the molded composite article of the invention has flame retardancy. It is preferred that the flame retardancy of the plate member  11  and the resin member  12  in a vertical flame test based on UL-94 standard is V-1 or V-0 when a specimen having a thickness of 0.1 to 3.0 mm is used. More preferred is V-1 or V-0 when a specimen having a thickness of 0.1 to 1.0 mm is used. 
         [0133]    It is preferred that the plate member  11  and/or the resin member  12  contains a flame retarder. Examples of the flame retarder include halogen compounds, antimony compounds, phosphorus compounds, nitrogen compounds, silicone compounds, fluorine compounds, phenol compounds and metal hydroxides. Among them, in view of inhibiting environmental load, a phosphorus-based flame retarder is preferred. Examples of the phosphorus-based flame retarder include phosphorus-containing compounds such as phosphoric esters, condensed phosphoric acid esters and phosphaphenanthrene-based compounds, and red phosphorus. Among them, since red phosphorus is large in the phosphorus atom content functioning to impart flame retardancy, the amount of red phosphorus added as a flame retarder for obtaining a sufficient flame retardant effect can be small. 
         [0134]    Further, the resin used for the plate member  11  and the resin member  12  may also contain a filler and other additives to such an extent that the object of the invention is not impaired. Examples of the filler and other additives include an inorganic filler, electrically conducting agent, crystal nucleating agent, ultraviolet light absorber, antioxidant, vibration damper, antimicrobial agent, insecticide, deodorant, coloration preventive, thermal stabilizer, releasing agent, antistatic agent, hydrophilizing agent, plasticizer, lubricant, colorant, pigment, dye, foaming agent, foam stabilizer and coupling agent. 
       EXAMPLES 
       [0135]    Particular examples of the invention are explained below. 
         [0136]    Methods for evaluating the properties in the examples: 
         [0137]    (1) Tensile Cracking Load 
         [0138]    A test was performed using the following tester and specimens under the following conditions. 
         [0139]    Name of tester: Precision universal tester (Autograph produced by Shimadzu Corporation) 
         [0140]    Specimens: 40 mm wide×50 mm long specimens were cut out of the joint between the plate member  11  and the resin member  12 . 
         [0141]    Inter-chuck interval: 30 mm 
         [0142]    Cross-head speed: 1.6 mm/min 
         [0143]    (2) Joint Warping 
         [0144]    To the region from the vertical wall  19  (see  FIG. 1 ) of the resin member  12  to the joint with the plate member  11 , an L-square rule of stainless steel was applied at right angles, and a thickness gauge was inserted into the clearance between the stainless steel rule and the surface of the joint, to confirm whether or not there was a clearance and to measure the dimension of the clearance, i.e., the joint warping. The value of the largest warping among samples was employed as joint warping. 
         [0145]    (3) Length of the Actual Bonding Line Per 1 Mm of Projection-Connecting Line 
         [0146]    The length of the recurring undulation units at the undulating bonding interface of the molded composite article  10  obtained by injection molding was obtained by measuring using a rule and by calculation. In the case where there was a roundish line segment in the profile line of the undulation form, the radius or diameter of the roundness was measured, and the formula for obtaining the circumference from the value was used to calculate the length of the actual bonding line. The total of the lengths of the recurring undulation units of the bonding line was divided by the length of the straight projection-connecting line, i.e., by the parallel direction length, to obtain the length of the actual bonding line per 1 mm length of the projection-connecting line, i.e., per 1 mm parallel direction length. 
         [0147]    (4) Number of Projections Per 100 Mm Length of Projection-Connecting Line 
         [0148]    The length of the recurring undulation units at the undulating bonding interface of the molded composite article  10  obtained by injection molding was obtained by measuring using a rule and by calculation. In the case where there was a roundish line segment in of the profile line of the undulation form, the radius or diameter of the roundness was measured, and the formula for obtaining the circumference from the value was used to calculate the length of the actual bonding line. Since one projection existed every recurring undulation unit, the length of the projection-connecting line per recurring unit was measured using a rule, and 100 mm was divided by the length of the projection-connecting line per recurring unit, to obtain the number of projections per 100 mm length of the projection-connecting line. 
         [0149]    (5) Recess Depth Ln 
         [0150]    The depth of a recess of the molded composite article  10  obtained by injection molding was measured using a rule. 
         [0151]    (6) Recess Opening Width Fn 
         [0152]    The opening width of a recess of the molded composite article  10  obtained by injection molding was measured using a rule. 
         [0153]    (7) Value of Ln/Fn 
         [0154]    This value was obtained by calculation from the abovementioned measured values of (5) and (6). 
       Example 1 
       [0155]    As the surface layer base materials of the plate member  11 , two laminates, each comprising two unidirectional carbon fiber prepreg sheets (UD PP) P3052S-12 [carbon fiber T700S (strength 4900 MPa, elastic modulus 230 GPa, carbon fiber weight content 67 wt %, base resin: epoxy resin) produced by Toray Industries, Inc.] laminated on each other with their fiber directions kept perpendicular to each other, were prepared, and one of the laminates was used as the surface layer base material  15   a  of the upper surface side, while the other laminate was used as the surface layer base material  15   b  of the lower surface side. As the core layer base material  16 , foam [product number RC2010 of EFSEL, registered trademark, produced by Furukawa Electric Co., Ltd.] (twice-expanded polypropylene) was prepared. 
         [0156]    On each of the upper and lower surfaces of the prepared core layer base material  16 , an adhesive polyolefin nonwoven fabric (melting point 150° C., unit weight per area 15 g/m 2  produced by Japan Vilene Company) was placed, and further on the upper and lower surfaces of the laminate, the prepared surface layer base materials  15   a  and  15   b  were placed. The laminate was then press-molded (mold temperature 160° C., pressure 6 MPa, preheating time 5 minutes, curing time 30 minutes), to obtain a plate-like body. The obtained plate-like body was processed to have a size of 300 mm×230 mm and NC-machined to form the undulating bonding interface shown in Example 1 of Table 1 and  FIG. 6  at the side end of the obtained plate-like body, to prepare a plate member  11 . 
         [0157]    The plate member  11  was set in an injection molding mold, and the mold was clamped. Fiber-reinforced copolymerized polyamide resin CM3511-G60 (glass fiber content 60 wt %, produced by Toray Industries, Inc.) as the resin to be formed into a resin member  12  was injection-molded to produce a molded composite article  10  as shown in  FIG. 1 , in which the side end on the side opposite to the vertical wall  19  of the resin member  12  having the vertical wall  19  penetrated into the undulation form of the plate member  11 , to ensure that the resin member  12  might be bonded to the plate member  11  via the undulating boding interface  13 JF. In the molded composite article  10 , the thickness of the resin member  12  in the region from the vertical wall  19  to the undulating bonding interface  13 JF was 1.5 mm, and the width of the resin member  12  along the left edge  10 E was 30 mm. 
       Example 2 
       [0158]    A molded composite article was prepared according to the same method as described in Example 1, except that the undulating bonding interface shown in Example 2 of Table 1 and  FIG. 7  was formed by NC machining in the plate-like body of Example 1. 
       Example 3 
       [0159]    A molded composite article was prepared according to the same method as described in Example 1, except that the undulating bonding interface shown in Example 3 of Table 1 and  FIG. 7  was formed by NC machining in the plate-like body of Example 1. 
       Example 4 
       [0160]    A molded composite article was prepared according to the same method as described in Example 1, except that the undulating bonding interface shown in Example 4 of Table 2 and  FIG. 8  was formed by NC machining in the plate-like body of Example 1. 
       Example 5 
       [0161]    A molded composite article was prepared according to the same method as described in Example 1, except that the undulating bonding interface shown in Example 5 of Table 2 and  FIG. 9  was formed by NC machining in the plate-like body of Example 1. 
       Comparative Example 1 
       [0162]    A molded composite article  50  shown in  FIG. 5  was prepared according to the same method as described in Example 1, except that the straight bonding interface shown in Comparative Example 1 of Table 3 was formed by NC machining in the plate-like body of Example 1. 
       Comparative Example 2 
       [0163]    As the surface layer boards of the plate member  101  (see  FIG. 4 ), two laminates, each comprising two unidirectional carbon fiber prepreg sheets (UD PP) P3052S-12 [carbon fiber T700S (strength 4900 MPa, elastic modulus 230 GPa, carbon fiber weight content 67 wt %, base resin: epoxy resin) produced by Toray Industries, Inc.] laminated on each other with their fiber directions kept perpendicular to each other, were prepared, and one of the laminates was used as the surface layer base material  105   a  of the upper surface side, while the other laminate was used as the surface layer base material  105   b  of the lower surface side. As the core layer base material  106 , foam [product number RC2010 of EFSEL, registered trademark, produced by Furukawa Electric Co., Ltd.] was prepared. 
         [0164]    On each of the upper and lower surfaces of the prepared core layer base material  106 , an adhesive polyolefin nonwoven fabric (melting point 150° C., unit weight per area 15 g/m 2  produced by Japan Vilene Company) was placed, and further on the upper and lower surfaces of the laminate, the prepared surface layer base materials  105   a  and  105   b  were placed, to prepare a crude laminate destined to be a plate member  101 . 
         [0165]    Further, separately, a molded resin article destined to be a resin member  102  was prepared. The molded resin article had an overlapping portion (bonding projection  107 ) (3 mm wide, 1 mm thick) to be mounted with the end of the plate member  101 . 
         [0166]    On the upper surface of the overlapping portion, an adhesive copolymerized nylon nonwoven fabric (melting point 150° C., unit weight per area 40 g/m 2  produced by Japan Vilene Company) was placed, and the crude laminate and the molded resin article were press-molded (mold temperature 160° C., pressure 6 MPa, preheating time 5 minutes, curing time 30 minutes), to produce a molded composite article. A molded composite article  40  shown in  FIG. 4  was prepared according to the same method as in Example 1, except that the molded composite article was processed to have a size of 300 mm×230 mm and NC-machined to form a straight bonding interface shown in Comparative Example 2 of Table 3. 
         [0167]    The tensile cracking loads of the molded composite articles of Examples 1 through 5 were measured, and it was confirmed that sufficient bonding strengths were obtained. The molded composite articles did not have a joint at which the plate member and the resin member overlapped on each other, and therefore could have a thinner wall accordingly. On the other hand, in the molded composite article of Comparative Example 1, a sufficient tensile cracking load could not be obtained, and the joint warping was also large. In the molded composite article of Comparative Example 2, the tensile cracking load was sufficient, but owing to the existence of the overlapping portion, a thin wall could not be achieved. 
         [0168]    Meanings of the respective items in Tables 1 through 3: 
         [0169]    Item 1: Material of fibers 
         [0170]    Item 2: Base resin 
         [0171]    Item 3: Material of foam 
         [0172]    Item 4: Material of fibers 
         [0173]    Item 5: Base resin 
         [0174]    Item 6: Form of recess Pn 
         [0175]    Item 7: Whether or not a roundish line segment existed in a profile line of the recess form of recess Pn 
         [0176]    Item 8: Length of the actual bonding line per 1 mm length of projection-connecting line PL (in mm) 
         [0177]    Item 9: Number of projections per 100 mm length of projection-connecting line PL 
         [0178]    Item 10: Recess depth Ln (in mm) 
         [0179]    Item 11: Recess opening width Fn (in mm) 
         [0180]    Item 12: Value of Ln/Fn 
         [0181]    Item 13: Whether or not there was an overlapping portion between the plate member and the resin member 
         [0182]    Item 14: Tensile cracking load (in N) 
         [0183]    Item 15: Value of joint warping (in mm) 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                 Example 1 
                 Example 2 
                 Example 3 
               
               
                   
               
             
             
               
                 Surface 
                 Item 1 
                 Carbon fibers 
                 Carbon fibers 
                 Carbon fibers 
               
               
                 layer base 
                 Item 2 
                 Epoxy-based 
                 Epoxy-based 
                 Epoxy-based 
               
               
                 material 
                   
                   
                   
                   
               
               
                 Core layer 
                 Item 3 
                 Polypropylene 
                 Polypropylene 
                 Polypropylene 
               
               
                 base 
                   
                   
                   
                   
               
               
                 material 
                   
                   
                   
                   
               
               
                 Resin 
                 Item 4 
                 Glass fibers 
                 Glass fibers 
                 Glass fibers 
               
               
                 member 
                 Item 5 
                 Polyamide- 
                 Polyamide- 
                 Polyamide- 
               
               
                   
                   
                 based 
                 based 
                 based 
               
               
                   
                 Item 6 
                 FIG. 6 
                 FIG. 7 
                 FIG. 7 
               
               
                   
                 Item 7 
                 Yes 
                 Yes 
                 Yes 
               
               
                   
                 Item 8 
                 1.97 
                 1.57 
                 1.57 
               
               
                   
                 Item 9 
                 7.7 
                 50.0 
                 5.0 
               
               
                   
                 Item 10 
                 8.0 
                 1.0 
                 10.0 
               
               
                   
                 Item 11 
                 8.0 
                 2.0 
                 20.0 
               
               
                   
                 Item 12 
                 1.0 
                 0.5 
                 0.5 
               
               
                   
                 Item 13 
                 No 
                 No 
                 No 
               
               
                 Mechanical 
                 Item 14 
                 1,300 
                 700 
                 1,250 
               
               
                 strength 
                   
                   
                   
                   
               
               
                 Joint 
                 Item 15 
                 0.1 
                 0.1 
                 0.2 
               
               
                 warping 
                   
                   
                   
                   
               
               
                   
                 Item 12 
                 1.0 
                 0.5 
                 0.5 
               
               
                   
                 Item 13 
                 No 
                 No 
                 No 
               
               
                 Mechanical  
                 Item 14 
                 1,300 
                 700 
                 1,250 
               
               
                 strength 
                   
                   
                   
                   
               
               
                 Joint 
                 Item 15 
                 0.1 
                 0.1 
                 0.2 
               
               
                 warping 
                   
                   
                   
                   
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                   
                   
                 Example 4 
                 Example 5 
               
               
                   
               
             
             
               
                 Surface layer base  
                 Item 1 
                 Carbon fibers 
                 Carbon fibers 
               
               
                 material 
                 Item 2 
                 Epoxy-based 
                 Epoxy-based 
               
               
                 Core layer base 
                 Item 3 
                 Polypropylene 
                 Polypropylene 
               
               
                 material 
                   
                   
                   
               
               
                 Resin member 
                 Item 4 
                 Glass fibers 
                 Glass fibers 
               
               
                   
                 Item 5 
                 Polyamide-based 
                 Polyamide-based 
               
               
                   
                 Item 6 
                 FIG. 8 
                 FIG. 9 
               
               
                   
                 Item 7 
                 No 
                 Yes 
               
               
                   
                 Item 8 
                 1.10 
                 2.09 
               
               
                   
                 Item 9 
                 5.0 
                 7.7 
               
               
                   
                 Item 10 
                 1.0 
                 8.0 
               
               
                   
                 Item 11 
                 1.0 
                 8.0 
               
               
                   
                 Item 12 
                 1.0 
                 1.0 
               
               
                   
                 Item 13 
                 No 
                 No 
               
               
                 Mechanical 
                 Item 14 
                 750 
                 1,800 
               
               
                 strength 
                   
                   
                   
               
               
                 Joint warping 
                 Item 15 
                 0.1 
                 0.1 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
               
               
               
             
           
               
                 TABLE 3 
               
               
                   
               
               
                   
                   
                 Comparative 
                 Comparative 
               
               
                   
                   
                 Example 1 
                 Example 2 
               
               
                   
               
             
             
               
                 Surface layer base 
                 Item 1 
                 Carbon fibers 
                 Carbon fibers 
               
               
                 material 
                 Item 2 
                 Epoxy-based 
                 Epoxy-based 
               
               
                 Core layer base 
                 Item 3 
                 Polypropylene 
                 Polypropylene 
               
               
                 material 
                   
                   
                   
               
               
                 Resin member 
                 Item 4 
                 Glass fibers 
                 Glass fibers 
               
               
                   
                 Item 5 
                 Polyamide-based 
                 Polyamide-based 
               
               
                   
                 Item 6 
                 Straight line 
                 Straight line 
               
               
                   
                 Item 7 
                 — 
                 — 
               
               
                   
                 Item 8 
                 1.00 
                 1.00 
               
               
                   
                 Item 9 
                 0 
                 0 
               
               
                   
                 Item 10 
                 0 
                 0 
               
               
                   
                 Item 11 
                 — 
                 — 
               
               
                   
                 Item 12 
                 — 
                 — 
               
               
                   
                 Item 13 
                 No 
                 Yes 
               
               
                 Mechanical 
                 Item 14 
                 400 
                 1,200 
               
               
                 strength 
                   
                   
                   
               
               
                 Joint warping 
                 Item 15 
                 0.6 
                 0 
               
               
                   
               
             
          
         
       
     
         [0184]    The molded composite article in one aspect of the invention can be suitably used as components of the housings of electric and electronic devices such as notebook personal computers and cell phones, and further suitably used also as components of automobile parts since the molded composite article has a light weight, high strength, high stiffness and thin wall.