Abstract:
An electrical connection box includes a plurality of circuit components at least partially overlapped one above the other and substantially parallel with each other each circuit component having a substrate including a switching member and an electric power conducting path; and a supporting member that retains the circuit components. The switching member capable of attaching and detaching is arrayed on an upper plane of an upper substrate. The electric power conducting path of a lower circuit component is provided with a terminal connectable by extending above the upper substrate with the switching member.

Description:
BACKGROUND OF THE INVETION 
   1. Field of the Invetion 
   The present invention relates to an electrical connection box. 
   2. Description of the Related Art 
   In JP-A-2003-164039, known is an electrical connection box constructed with a control circuit substrate, a switching member arrayed on the surface of the control circuit substrate and controlled by the control circuit substrate and an electric power conducting path arrayed on the back of the control circuit substrate and connected with a power source. 
   SUMMARY OF THE INVETION 
   Since a relatively large electric current flows through an electric power conducting path in this type of electrical connection box, it must be structured to occupy a larger installation space such as broader metal plates. Therefore, a larger number of branch circuits and poles used in the electric power conducting path will inevitably require a greater space for installing electric power conducting paths, resulting in a larger-sized control circuit substrate. 
   The present invention has been made on the basis of the above circumstances. It is an object of the invention to make an electrical connection box smaller. 
   According to one aspect of the invention, there is provided with an electrical connection box includes a plurality of circuit components at least partially overlapped one above the other and substantially parallel with each other each circuit component having a substrate including a switching member and an electric power conducting path; and a supporting member that retains the circuit components. The switching member capable of attaching and detaching to the substrate is arrayed on an upper plane of an upper substrate. The electric power conducting path of a lower circuit component is provided with a terminal connectable to the switching member by extending above the upper substrate. 
   One sheet of a substrate can be made smaller because the substrate is divided into plural pieces so that they can be overlapped one above the other, thereby making the electrical connection box smaller as a whole. In addition, since the electric power conducting path of the lower circuit component is provided with a terminal extending above the upper substrate and attachable and detachable switching members are arrayed in a concentrated manner on the upper plane of the upper substrate, the switching members can be easily attached or detached. 
   According to another aspect of the invention, the upper substrate has a positioning hole that allows the terminal to penetrate. 
   By thus configuration, a terminal is allowed to penetrate through the positioning hole, by which the terminal can be positioned in relation to the upper substrate and the attachable and detachable switching members. 
   According to another aspect of the invention, the supporting member has through-holes that allow a plurality of the terminals to penetrate individually. 
   By thus configuration, plural terminals are individually accommodated into the through-hole, thus making it possible to avoid accidental short-circuits of terminals even when the terminals are adjacent to each other. 

   
     BRIEF DESCIRPTION OF THE DRAWINGS 
       FIG. 1  is an exploded perspective view. 
       FIG. 2  is a perspective view of the first circuit component. 
       FIG. 3  is a perspective view of the frame of the case. 
       FIG. 4  is a perspective view of the second circuit component. 
       FIG. 5  is a sectional view. 
       FIG. 6  is a perspective view showing the tuning-fork shaped terminal. 
       FIG. 7  is a perspective view showing the positioning part. 
       FIG. 8  is a perspective view showing the tab terminal. 
       FIG. 9  is a enlarged sectional view showing a state that the tuning-fork shaped terminal is fitted into the tab terminal. 
       FIG. 10  is a partially-enlarged sectional view of the structure where the first circuit component is adhered to the insulating plate. 
       FIG. 11  is a partially-enlarged sectional view of the structure where the second circuit component is adhered to the radiator plate. 
       FIG. 12  is a plain view of the upper cover. 
       FIG. 13  is a plain view of the frame. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Embodiment 1 
   Hereinafter, the Embodiment 1 of the present invention will be explained by referring to  FIG. 1  through  FIG. 13 . The electrical connection box of the present embodiment is structured so that the first circuit component  10  (an upper circuit component) and the second circuit component  30  (a lower circuit component) are overlapped one above the other in a horizontal manner and accommodated into the case  40 . 
   The first circuit component  10  is provided with the approximately rectangular supporting substrate  11  (as the upper substrate), the first electric power conducting path  12  arrayed along the supporting substrate  11  and the relay  22  (attachable and detachable switching member) attached to the upper cover  41  which will be explained later. As illustrated in  FIG. 10 , the supporting substrate  11  is divided into two layers above and below. In addition, the first electric power conducting path  12  is composed of a plurality of bus bars made with a thick metal sheet punched out into a predetermined shape and divided into three layers above and below. The first electric power conducting path  12  (top layer) is adhered to the upper plane (surface) of the upper supporting substrate  11 , and the first electric power conducting path  12  (intermediate layer) and the first electric power conducting path  12  (bottom layer) are respectively adhered to both the upper and the lower planes (surface and back) of the lower supporting substrate  11 . Plural relay terminals  13  penetrating through the supporting substrate  11  and projecting to the upper plane (surface) at an approximately right angle, plural fuse terminals  14  penetrating through the supporting substrate  11  and projecting to the upper plane (surface) at an approximately right angle and plural tuning-fork shaped terminals  15  projecting downward from the lower plane of the supporting substrate  11  at an approximately right angle, are formed in a integrated manner in the first electric power conducting path  12 . 
   The tuning-fork shaped terminal  15  is in a vertically-long band plate form (tab shape) as a whole and arrayed in a line at a predetermined pitch back and forth along the left edge on the peripheral edge of the supporting substrate  11 . The tuning-fork shaped terminal  15  is provided with the notch part  16  which is notched upward from the lower facing toward the longitudinal direction (in parallel in the direction that it is fitted into the tab terminal  36 ). A longitudinal-direction opening of this notch part  16  is made gradually wider from the top to the bottom, except for the lower end part, and made narrower at the admission part  17  on the lower end of the notch part  16 . In other words, parts on both the right and the left sides of the notch part  16  at the tuning-fork shaped terminal  15  are a pair of holding strips  18  extended out downward in a cantilevered form. The side edge on the notch part  16  at the lower end part of each holding strip  18  is the guidance part  19  extended out (projected) to the opposite holding strip  18  in a circular form, and the pair of the guidance parts  19  constitute the admission part  17  of the notch part  16 . 
   The insulating plate  20 , one piece of a plate covering a whole dimension of the supporting substrate  11 , is adhered to the lower plane of the supporting substrate  11 , or the lower plane of the first electric power conducting path  12  (bottom layer) in a state of being closely overlapped by the use of an adhesive agent (not illustrated here). This insulating plate  20  is provided for regulating heat conduction between the upper first circuit component  10  and the lower second circuit component  30 , and constituting a wall partitioning the sealed space  61  to be explained later. The insulating plate  20  is made with materials lower in heat conductivity, for example, synthetic resins mainly composed of high-polymer materials such as polyethylene. Said insulating plate  20  is also electrically insulative. The insulating plate  20  is also provided with plural through-holes  21 , through which the tuning-fork shaped terminals  15  penetrate, in a horizontal deflection being regulated. In other words, the tuning-fork shaped terminals  15  project downward from the insulating plate  20 . 
   The supporting substrate  11  is penetrated vertically by a plurality of slit-line positioning holes  11 H in such a way that they are arrayed in a line along the front edge and the left edge of the supporting substrate. These positioning holes  11 H are holes for allowing the relay terminal  34  of the second circuit component  30  to be explained later to penetrate in a case where the terminal is positioned firmly. The positioning holes  20 H for allowing the relay terminal  34  of the second circuit component  30  to penetrate in a case where the terminal is positioned firmly are also formed on the insulating plate  20  in such a way that they are arrayed in a line in correspondence with the positioning holes  11 H of the supporting substrate  11  and also attaining a vertical penetration. 
   The second circuit component  30  is provided with the approximately rectangular control circuit substrate  31 , the second electric power conducting path  32  arrayed along the lower plane of the control circuit substrate  31  and the semiconductor switching element  33  (as switching member) projected on the upper plane (surface) of the control circuit substrate  31 . The second electric power conducting path  32  consists of plural bus bars made with a thick metal sheet punched out into a predetermined shape. As illustrated in  FIG. 11 , it is electrically insulative to the lower plane of the control circuit substrate  31  and adhered so as to contact with the plane through an adhesive agent or a thin adhesive sheet  37  high in heat conductivity and in close proximity thereto. Plural relay terminal  34  projecting at an approximately right angle to the upper plane (surface) along the front edge and the left edge on the peripheral edge of the control circuit substrate  31 , plural fuse terminals  35  projecting at an approximately right angle to the upper plane (surface) along the back edge on the peripheral edge of the control circuit substrate  31  and plural tab terminals  36  projecting at an approximately right angle to the upper plane (surface) along the left edge on the peripheral edge of the control circuit substrate  31  are formed in an integrated manner in the second electric power conducting path  32 . 
   The tab terminal  36  is in a vertically-long band plate form (tab shape) and arrayed in a line at a predetermined pitch back and forth along the left edge on the peripheral edge of the control circuit substrate  31 , that is in a form corresponding to the tuning-fork shaped terminal  15 . The upper edge of the tab terminal  36  faces the back and forth direction so as to give a right angle to the lower edge of the tuning-fork shaped terminal  15 . Further, the plate thickness dimension of the tab terminal  36  is to be equal to or slightly larger than an opening width (namely, a pitch between the guidance parts  19  of the holding strip  18 ) of the admission part  17  at the notch part  16  of the tuning-fork shaped terminal  15 . 
   As with the tab terminal  36 , the relay terminal  34  is in a vertically-long band plate form (tab shape) and arrayed in a line at a predetermined pitch back and forth along the front edge and the left edge on the peripheral edge of the control circuit substrate  31 . 
   The case  40  is structurally provided with the upper cover  41 , the frame  48  (as supporting member) and the radiator plate  60 . 
   The upper cover  41  is made with a synthetic resin, consisting of the approximately rectangular encircling wall  42  which encircles all the circumference of the first circuit component  10  and the second circuit component  30  and the upper plane plate  43  which covers the first circuit component  10  from the top, with the inner space of the upper cover  41  opened downward. The upper plane plate  43  is provided with plural relay fixing parts  44  which are formed in a rectangular tubular form and pointed upward. The relays  22  which are formed in a block are individually fitted into the relay fixing parts  44  in a detachable manner. In addition, the relay terminal  13  of the first electric power conducting path  12  and the relay terminal  34  of the second electric power conducting path  32  approach inside the relay fixing part  44 , penetrating the through-hole  44 H at the bottom, and the relays  22  attached to the relay fixing part  44  are connected to the relay terminals  13  and  34 . 
   In addition, the upper plane plate  43  is provided with plural fuse fixing parts  45  arrayed in a concave manner along the back edge. The fuse terminal  14  of the first electric power conducting path  12  approaches inside the fuse fixing part  45 , penetrating through the bottom, and the fuse (not illustrated here) attached to the fuse fixing part  45  is connected to the fuse terminal  14 . The upper plane plate  43  is also provided with the tubular fitting part  47  corresponding to the wire harness connector  46  to be explained later. 
   The frame  48  is made with a synthetic resin, available in an approximately rectangular form which encircles the circumference of the second circuit component  30 , with both the upper and lower planes opened (vertically penetrated structure). Of frame parts in all directions constituting the frame  48 , the front edge frame part  49  and the left edge frame part  50  of the frame  48  are provided with the through-holes  51  for allowing the relay terminals  34  of the second circuit component  30  to penetrate in a case where the relay terminals are positioned individually and fixed without rattle. Further, the back edge frame part  52  of the frame  48  is provided with the through-holes  53  for allowing the fuse terminals  35  of the second circuit component  30  to penetrate. 
   The front edge frame part  49  of the frame  48  is provided with the positioning rib  23  for regulating a relative deflection of the frame  48  toward the front of the first circuit component  10  by allowing the supporting substrate  11  of the first circuit component  10  to contact from the back. Further, the back edge frame part  52  of the frame  48  is provided with the positioning rib  24  for regulating a relative deflection of the frame  48  toward the back and the right or left direction of the first circuit component  10  by allowing the supporting substrate  11  of the first circuit component  10  to contact from the front as well as from both the right and left directions. 
   The left edge frame part  50  of the frame  48  is provided with plural positioning parts  55  for accommodating the tab terminal  36  and the tuning-fork shaped terminal  15 . These positioning parts  55  are in a hole shape of penetrating through the right edge frame part  50  vertically or in parallel with the direction that the tuning-fork shaped terminal  15  is fitted into the tab terminal  36 , and an inner part of each positioning part  55  is an accommodating space  56 . The accommodating space  56  of each positioning part  55  is connected in a non-communicative manner with the accommodating space  56  of other positioning spaces  55 , and the accommodating spaces  56  adjacent in the back and forth direction are, therefore, partitioned by a wall constituting the right edge frame part  50 . 
   These accommodating spaces  56  are individually available in a cross-like figure, when viewed from the direction that the terminal  15  is fitted into the terminal  36 , in other words, the first space  57  formed in a slit shape in the back and forth direction and the second space  58  formed in a slit shape in the longitudinal direction are intersected in an approximately right angle. Of these accommodating spaces  56 , the tuning-fork shaped terminal  15  is fitted from above into the first space  57  formed in the longitudinal direction, and the thus fitted tuning-fork shaped terminal  15  is regulated for the deflection made in the back and forth direction or in the longitudinal direction in relation to the frame  48  by contacting with the inner wall of the first space  57 , and the notch part  16  of the tuning-fork shaped terminal  15  corresponds with the space in the back and forth direction. Further, the tab terminal  36  is fitted from below into the second space  58  in the back and forth direction in the accommodating space  56 , and the thus fitted tab terminal  36  is regulated for the deflection made in the back and forth direction or in the longitudinal direction in relation to the frame  48  by contacting with the inner wall of the second space  58 . Inside the accommodating space  56  (positioning part  55 ), the upper end part of the tab terminal  36  is closely fitted into the notch part  16  of the tuning-fork shaped terminal, by which the first electric power conducting path  12  and the second electric power conducting path  32  are communicatively connected. 
   The taper-shaped guiding plane  59  is formed on opening edges of upper and lower ends of the accommodating space  56 . Thus, even if the terminals  15  and  36  are placed into the accommodating space  56  at a slightly deviated position when the tuning-fork shaped terminal  15  and the tab terminal  36  are fitted into the accommodating space  56 , the terminals  15  and  36  make contact with the guiding plane  59 , by which the deviated position of the terminals  15  and  36  in the frame  48  can be corrected and the terminals  15  and  36  are guided into the accommodating space  56  without fail. 
   The wire harness connector  46  is fixed from above to the both right and left ends of the front edge frame part  49  of the frame  48 , and the lower end part of the terminal fitting  46   a  of the connector  46  is connected to the control circuit substrate  31  of the second circuit component  30 . The upper end part of the terminal fitting  46   a  of the connector  46  approaches into the tubular fitting part  47  of the upper cover  41  in preparation for connecting with the wire harness connector (not illustrated) and the terminal fitting (not illustrated). 
   The radiator plate  60  is made with an approximately rectangular metal plate (for example, aluminum), completely closing an opening on the lower part of the frame  48 . As illustrated in  FIG. 11 , the radiator plate  60  is electrically insulative to the lower plane of the second electric power conducting path  32  of the second circuit component  30  and adhered so as to contact with the plane through an adhesive agent or a thin adhesive sheet  38  high in heat conductivity and in close proximity thereto. Thus, heat generated at the semiconductor switching element  33  when electricity is distributed to the second electric power conducting path  32  is effectively conducted to the radiator plate  60  through the adhesive agent or adhesive sheets  37  and  38  and the second electric power conducting path  32  and released outside (downward) the case  40 . 
   The lower plane of the frame  48  is adhered to the upper plane of the radiator plate  60  through a water-proof seal layer (not illustrated here) in a state where the case  40  is assembled and the second circuit component  30  (including the switching element  33 ) is accommodated into the sealed space  61  constituted with the frame  48  and the radiator plate  60 . Then, the peripheral edge part of the insulating plate  20  of the first circuit component  10  is placed on the upper plane of the frame  48  (sealed space  61 ), by which the second circuit component  30  inside the sealed space  61  or the sealed space  61  can be protected from water, dust and others coming outside. 
   The first circuit component  10  is positioned by the positioning ribs  23  and  24  in such a way that a relative deflection toward the back and forth direction or the right and left direction is regulated. The above placement and the positioning structure make it possible that the supporting substrate  11  of the first circuit component  10  is overlapped one above the other with the control circuit substrate  31  of the second circuit component  30  at a predetermined space and mutually in a parallel form, interference of the switching element  33  with the supporting substrate  11  (insulating plate  20 ) is avoided and the tuning-fork shaped terminal  15  is connected to the tab terminal  36  at a normal position. 
   Further, the lower relay terminals  34  are, respectively, through the through-hole  51  of the frame  48 , the positioning hole  20 H of the insulating plate  20 , the positioning hole  11 H of the supporting substrate  11  and the through-hole  44 H of the relay fixing part  44 , approaching inside the relay fixing part  44 . When the relay  22  is attached to the relay fixing part  44 , the relay terminal  34  is connected to the relay  22 . An inner wall of the encircling wall  42  of the upper cover  41  is fitted into an outer circumference of the frame  48  almost in a firmly adhered manner. The upper cover  41  is covered above by protective cover (not illustrated here) for protecting the relays  22 , fuses and connectors. 
   As explained above, in this embodiment, the first circuit component  10  in which the supporting substrate  11  is provided with the relay  22  and the first electric power conducting path  12  and the second circuit component  30  in which the control circuit substrate  31  is provided with the second electric power conducting path  32  and the switching element  33  are kept by the frame  48  of the case  40  so that they can be overlapped one above the other and mutually in a parallel form. A substrate is divided into plural pieces to be overlapped one above the other, and one sheet of the substrate (supporting substrate  11  and control circuit substrate  31 ) can be made smaller (smaller in area), thus making it possible to reduce a whole dimension of the electric connection box. Further, the supporting substrate  11  and the control circuit substrate  31  are kept mutually in an approximately parallel form and at a predetermined space, by which the electric power conducting path  12  and the electric power conducting path  32  can be connected stably with their respective counterparts. 
   The relay  22 , a switching member fixed to the substrate in an attachable and detachable manner, is arrayed on the upper plane of the upper supporting substrate  11 , and the relay terminal  34  connected by extending above the upper supporting substrate  11  to the attachable and detachable relay  22  is provided on the second electric power conducting path  32  of the lower second circuit component  30 . Such constitution makes it possible that the attachable and detachable switching member (relay  22 ) is arrayed in a concentrated manner on the upper plane of the supporting substrate  11  and the relay  22  is attached or detached easily. 
   Further, since the upper supporting substrate  11  is provided with the positioning hole  11 H for allowing the relay terminal  24  to penetrate in such a way that the terminal can be firmly fixed, the relay terminal  34  is penetrated through the positioning hole  11 H, thus making it possible to give positioning to the relay terminal  34  in relation to the supporting substrate  11  and the relay  22 . 
   In addition, the frame  48  is provided with through-holes  51  for allowing plural relay terminals  34  to penetrate individually, and plural relay terminals  34  are individually accommodated into the through-holes  51 , thus making it possible to avoid accidental short-circuits between the relay terminals  34 , even when these relay terminals  34  are mutually adjacent. 
   What is more, in this embodiment, the sealed space  61  is formed in the case  40 , and among the two circuit components  10  and  30 , the second circuit component  30  in which a switching member is constituted with the semiconductor switching elements  33  (semiconductor elements) is accommodated in the sealed space  61 , thereby preventing attachment of foreign substances such as water and dust on the surface of the control circuit substrate  31  and also preventing short-circuits in a circuit of the control circuit substrate  31  due to the attachment of foreign substances. 
   Where the second circuit component  30  is accommodated into the sealed space  61 , there is a concern that heat generated at the semiconductor switching element  33  may be kept inside the sealed space  61 . However, in this embodiment, since an outer wall (lower plane wall) of the case  40  constituting the sealed space  61  is made with the radiator plate  60  high in heat conductivity, heat inside the sealed space  61  can be effectively released outside. 
   Further, inside the sealed space  61 , the semiconductor switching element  33  is arrayed on the surface of the control circuit substrate  31 , the second electric power conducting path  32  is arrayed on the back plane of the control circuit substrate  31 , and the second electric power conducting path  32  is overlapped with the radiator plate  60  so as to contact on the surface. Thus, heat generated at the semiconductor switching element  33  is effectively conducted via the second electric power conducting path  32  to the radiator plate  60  and radiated outside the sealed space  61  (outside the case  40 ) significantly. Further, the second electric power conducting path  32  and the radiator plate  60  are adhered via an adhesive agent or adhesive sheets  37  and  38 , thereby increasing the heat conductivity from the second electric power conducting path  32  to the radiator plate  60 . 
   Where these two circuit components  10  and  30  are arrayed in a mutually overlapping manner, there is a concern that heat generated at the semiconductor switching element  33  of the lower second circuit component  30  is conducted to the upper first circuit component  10 , thus resulting in an overheated condition at the first circuit component  10 . In this embodiment, however, since the insulating plate  20  capable of preventing heat conduction between the first circuit component  10  and the second circuit component  30  is provided between these circuit components, there will be no overheat at the upper first circuit component  10 . 
   Further, since the insulating plate  20  is available in a plate form, composing a wall for partitioning the sealed space  61 , it is fewer in the number of parts and simplified in structure as compared with a structure in which overlapped are insulating plates separated from a wall constituting a sealed space. 
   When the electric power conducting path  12  with the channel  32  are connected, the tuning-fork shaped terminal  15  is provided on the upper first electric power conducting path  12 , the tab terminal  36  is also provided on the lower second electric power conducting path  32 , and the positioning part  55  for positioning the two terminals  15  and  36  at a normal connecting site is provided on the frame  48 . Therefore, since the frame  48  positions the terminals  15  and  36 , the structure can be simplified as compared with a case where a special positioning member is provided in addition to the frame  48 . 
   The tuning-fork shaped terminal  15  and the tab terminal  36 , which connects the electric power conducting paths  12  and  32 , are provided so as to be adjacent to each other in a plural number. Plural tuning-fork shaped terminals  15  are individually accommodated into plural accommodating spaces  56  made in the frame  48 , and plural tab terminals  36  are also individually accommodated into plural accommodating spaces  56 , thereby making it possible to prevent short-circuits between the tuning-fork shaped terminals  15  and also short-circuits between adjacent tab terminals  36 . 
   In the first embodiment, the first circuit component  10  in which the first electric power conducting path  12  is arrayed along the supporting substrate  11  and the second circuit component  30  in which the second circuit component  30  is arrayed along the control circuit substrate  31  are overlapped one above the other and mutually in an approximately parallel form and accommodated into the case  40 , and the tuning-fork shaped terminals  15  of the first electric power conducting path  12  are fitted into the tab terminals  36  of the second electric power conducting path  32  one above the other so that they can be connected. Further, the frame  48  of the case  40  is provided with the positioning part  55  for regulating deflection of the terminals  15  and  36  on both the first and second circuit components toward the direction (back and forth or right and left direction) intersecting in the vertical direction (direction that the terminals  15  and the terminals  36  are fitted into their respective counterparts). Such provision of the positioning part  55  makes it possible to give positioning to plural tuning-fork shaped terminals  15  and plural tab terminals  36  all together and also to fit plural tuning-fork shaped terminals  15  into plural tab terminals  36  at the same time (all together). Further, the positioning part  55  is provided in the case  40  for accommodating the circuit components  10  and  30 , thereby eliminating the necessity for the special positioning member  55 . 
   In addition, both of the tuning-fork shaped terminal  15  and the tab terminal  36  are in a plate form (tab shape), and the tab terminal  36  is fitted into the notch part  16  formed on the tuning-fork shaped terminal  15  so that these terminals can be connected. The respective terminals  15  and  36  are available in a plate form and, therefore, simplified in structure. Further, one of the terminals (tuning-fork shaped terminal  15 ) is provided with the notch part  16 , into which another terminal (tab terminal  36 ) is fitted, thereby resulting in a simplified structure where the terminals  15  and  36  are fitted respectively into their counterparts. 
   A plurality of the tuning-fork shaped terminals  15  and a plurality of the tab terminals  36  are adjacently arrayed in a line in the back and forth direction. In this embodiment, a wall partitioning each hole-like space  56  constituting the positioning part  55  is structured to exist between the terminals, thus making it possible to avoid short-circuits between the terminals, without providing a special short-circuit preventive member. Further, short-circuits between the terminals can be prevented more assuredly because a part at which the tuning-fork shaped terminal  15  is fitted into the tab terminal  36  is accommodated into the hole-like space  56  of the positioning part  55 . 
   Other Embodiments 
   The present invention shall not be restricted to the embodiment described with reference to the above description and figures, but, for example, includes the following embodiments in the technical field of the invention. In addition, the invention can be executed in various modifications other than the examples shown below without deviating from the scope of the present invention. 
   (1) In the above embodiment, only one circuit component is accommodated into the sealed space. However, the present invention shall not be restricted to the above embodiment, but a plurality of circuit components may be accommodated into the sealed space. 
   (2) In the above embodiment, an explanation is made about a case where the number of the circuit components is 2. However, the above-embodiment of the present invention is also applicable to an electrical connection box where three or more circuit components are overlapped. 
   (3) In the above embodiment, the insulating member is adhered to the lower plane of the substrate on the upper circuit component. However, the embodiment of the invention includes a structure where the insulating member may be separated from the substrate. 
   (4) In the above embodiment, the electric power conducting path inside the sealed space is overlapped with the radiator plate so as to contact on the surface. However, the above-embodiment of the present invention may include a case where the electric power conducting path inside the sealed space may be separated from the radiator plate. 
   (5) In the above embodiment, only the lower plane of the sealed space is constituted with the radiator plate. However, the above-embodiment of the present invention may include a case where an area corresponding to the frame may be constituted with the radiator plate. 
   (6) In the above embodiment, the frame is provided with the positioning part to give positioning to the tuning-fork shaped terminal of the upper electric power conducting path and the tab terminal of the lower electric power conducting path. However, the embodiment of the present invention may include a case where the positioning part may be independently separated from the frame. 
   (7) In the above embodiment, the tuning-fork shaped terminal is connected with the tab terminal inside the frame. However, the embodiment of the present invention may include a case where these terminals may be connected outside the frame. 
   (8) In the above embodiment, the terminals of the lower circuit component are formed with the electric power conducting path in an integrated manner. However, the above-embodiment of the present invention may include a case where the terminals may be apart separated from the electric power conducting path. 
   (9) In the above embodiment, the positioning hole is provided on upper supporting substrate. However, the above-embodiment of the present invention may include a structure where no positioning hole is provided (structure where terminals of the lower electric power conducting path are not penetrated through the upper supporting substrate). 
   (10) In the above embodiment, through-holes are provided on the frame. However, the above-embodiment of the present invention may include a structure where terminals may not be penetrated through the frame. 
   (11) In the above embodiment, a moisture proof agent may be applied to a narrow pitch part on the substrate or a potting agent may be injected into the substrate. 
   (12) In the above embodiment, the substrates  11 ,  31  are configured by a printed circuit board. 
   (13) In the above embodiment, the radiator plate  60  may be a heat radiating panel, heat spreader panel, and a heat transfer panel.