Abstract:
In electronic devices, as a result of miniaturization, the distance between a mounting board and an upper board or a shield case and the like, or the distance between the mounting board and other electronic components mounted adjacent thereto has become smaller. An electronic component is provided with: an element body internally containing a circuit element; and a terminal formed on the element body. The terminal is formed over an end surface of the element body and a surface adjacent to the end surface. An insulating film covering the terminal is formed on the element body. The terminal is exposed from the insulating film at least at a mounting surface of the element body, and a plating film containing tin is formed on a portion of the terminal exposed from the insulating film.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims benefit of priority to Japanese Patent Application 2014-249622 filed Dec. 10, 2014, and to International patent application Ser. No. PCT/JP2015/084060 filed Dec. 3, 2015, the entire content of which is incorporated herein by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The present disclosure relates to an electronic component including an element body having a circuit element therein and a terminal formed on the element body. 
       BACKGROUND 
       [0003]    In some conventional electronic components, an element body having a circuit element therein is formed by laminating an insulator layer and a conductor pattern or by disposing a wound conductive wire inside, and a terminal is formed over an end surface and four surfaces adjacent to the end surface of the element body. 
         [0004]    In an electronic device on which this kind of electronic component is mounted, distance from a mounting substrate to an upper substrate thereof, a shielding case, or the like, and a distance to another adjacently mounted electronic component are reduced in association with miniaturization. Mounting a conventional electronic component on a mounting substrate of such an electronic device has a problem such that a terminal formed on an upper surface of the electronic component comes into contact with the upper substrate or the shielding case, and causes a short circuit with the upper substrate or the shielding case, or such that terminals of adjacent electronic components come into contact with each other and cause a short circuit between the electronic parts. 
         [0005]    To solve such a problem, some electronic components have terminals  132  formed only on a bottom surface of an element body  131  as shown in  FIG. 13  (see, e.g., Japanese Laid-Open Patent Publication No. 2014-138168) or have terminals  142  formed over a bottom surface and side surfaces of an element body  141  as shown in  FIG. 14  (see, e.g., Japanese Laid-Open Patent Publication No. 2013-153009). 
         [0006]    Since the conventional electronic component shown in  FIG. 13  has an end portion of a conductor pattern led out to the bottom surface of the element body  131  through a conductor V in a through-hole provided in an insulator layer and the conductor V is connected to the terminals  132  on the bottom surface of the element body  131 , a structure inside the element body is complicated and the characteristics cannot be improved because of a space for forming the conductor V. 
         [0007]    Since the conventional electronic component shown in  FIG. 14  must have a winding axis of a coil made parallel to the mounting surface of the element body, it is difficult to reduce the height. 
         [0008]    To solve such problems, as shown in  FIG. 15 , a conductive material is applied over end surfaces and four surfaces adjacent to the end surfaces of an element body  151 , baked, and plated with tin or a tin alloy to form terminals  152 , and this element body  151  is covered with a resin film  153  except a bottom surface in some electronic components (see, e.g., Japanese Laid-Open Patent Publication Nos. 2013-26392 and 2013-58558). 
         [0009]    Since an end portion of the resin film covering the element body formed in this way tends to be thin and the terminals are covered with a tin or tin alloy plating, solder enters inside through a gap between a terminal and an insulating film as well as through the tin or tin alloy plating at the time of connection to a wiring pattern of a mounting substrate, and thereby causing a problem of a destruction of the insulating film and a deterioration in insulation. 
       SUMMARY 
       [0010]    It is an object of one or more embodiments of the present disclosure to provide an electronic component capable of preventing a short circuit with an upper substrate or a shielding case and a short circuit between electronic components, and capable of preventing a destruction of an insulating film and a deterioration in insulation. 
         [0011]    One or more embodiments of the present disclosure provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body, wherein an insulating film covering the terminal is formed on the element body, wherein the terminal is exposed from the insulating film at least on a mounting surface of the element body, and wherein a plating film containing tin is formed only on a portion of the terminal exposed from the insulating film. 
         [0012]    One or more embodiments of the present disclosure also provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body, wherein an insulating film covering the terminal is formed on the element body, wherein the insulating film has a removed part formed at least on a mounting surface of the element body, and wherein a plating film is formed in the removed part. 
         [0013]    One or more embodiments of the present disclosure further provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body and has a surface on which a first plating film is formed with a second plating film formed on a portion of the first plating film, and wherein an insulating film is formed on a location on the element body other than a portion on which the second plating film of the terminal is formed. 
         [0014]    One or more embodiments of the present disclosure further provides a method of manufacturing an electronic component including an element body having a circuit element therein and a terminal formed on the element body, the method comprising the steps of forming an element body having a circuit element therein and forming a terminal on the element body; forming an insulating film on the element body to cover the terminal; removing the insulating film to form a removed part in which the terminal is exposed on a bottom surface; and applying plating to form a plating film on the removed part. 
         [0015]    One or more embodiments of the present disclosure further provides a method of manufacturing an electronic component including an element body having a circuit element therein and a terminal formed on the element body, the method comprising the steps of forming an element body having a circuit element therein, forming a terminal on the element body, and forming a first plating film on the terminal; forming an insulating film on the element body; and forming a second plating film on the first plating film of the terminal exposed from the insulating film. 
         [0016]    Since one or more embodiments of the present disclosure provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body, wherein an insulating film covering the terminal is formed on the element body, wherein the terminal is exposed from the insulating film at least on a mounting surface of the element body, and wherein a plating film containing tin is formed only on a portion of the terminal exposed from the insulating film, a short circuit with an upper substrate or a shielding case and a short circuit between electronic components may be prevented, and the destruction of the insulating film and the deterioration in insulation may be prevented. 
         [0017]    Since one or more embodiments of the present disclosure also provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body, wherein an insulating film covering the terminal is formed on the element body, wherein the insulating film has a removed part formed at least on a mounting surface of the element body, and wherein a plating film is formed in the removed part, a short circuit with an upper substrate or a shielding case and a short circuit between electronic components may be prevented, and the destruction of the insulating film and the deterioration in insulation may be prevented. 
         [0018]    Since one or more embodiments of the present disclosure further provides an electronic component comprising an element body having a circuit element therein; and a terminal formed on the element body, wherein the terminal is formed over an end surface and a surface adjacent to the end surface of the element body and has a surface on which a first plating film is formed with a second plating film formed on a portion of the first plating film, and wherein an insulating film is formed on a location on the element body other than a portion on which the second plating film of the terminal is formed, a short circuit with an object around the electronic component may be prevented, and the destruction of the insulating film and the deterioration in insulation may be prevented. 
         [0019]    Since one or more embodiments of the present disclosure further provides a method of manufacturing an electronic component including an element body having a circuit element therein and a terminal formed on the element body, the method comprising the steps of forming an element body having a circuit element therein and forming a terminal on the element body; forming an insulating film on the element body to cover the terminal; removing the insulating film to form a removed part in which the terminal is exposed on a bottom surface; and applying plating to form a plating film on the removed part, a short circuit with an upper substrate or a shielding case and a short circuit between electronic components may be prevented, and the destruction of the insulating film and the deterioration in insulation may be prevented. 
         [0020]    Since one or more embodiments of the present disclosure further provides a method of manufacturing an electronic component including an element body having a circuit element therein and a terminal formed on the element body, the method comprising the steps of forming an element body having a circuit element therein, forming a terminal on the element body, and forming a first plating film on the terminal; forming an insulating film on the element body; and forming a second plating film on the first plating film of the terminal exposed from the insulating film, a short circuit with an object around the electronic component may be prevented, and the destruction of the insulating film and the deterioration in insulation may be prevented. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a partial cross-sectional view of a first embodiment of an electronic component of the present disclosure. 
           [0022]      FIGS. 2(A), 2(B), 2(C) and 2(D)  are partial cross-sectional views for explaining a manufacturing method of the first embodiment of the electronic component of the present disclosure. 
           [0023]      FIGS. 3(A) and 3(B)  are partial cross-sectional views for explaining a second embodiment of the electronic component of the present disclosure and a manufacturing method thereof. 
           [0024]      FIG. 4  is a partial cross-sectional view of a third embodiment of the electronic component of the present disclosure. 
           [0025]      FIG. 5  is a partial cross-sectional view of a fourth embodiment of the electronic component of the present disclosure. 
           [0026]      FIG. 6  is a partial cross-sectional view of a fifth embodiment of the electronic component of the present disclosure. 
           [0027]      FIGS. 7(A), 7(B), 7(C), 7(D) and 7(E)  are partial cross-sectional views for explaining a manufacturing method of the fifth embodiment of the electronic component of the present disclosure. 
           [0028]      FIG. 8  is a partial cross-sectional view of a sixth embodiment of the electronic component of the present disclosure. 
           [0029]      FIG. 9  is a partial cross-sectional view of a seventh embodiment of the electronic component of the present disclosure. 
           [0030]      FIG. 10  is a partial cross-sectional view of an eighth embodiment of the electronic component of the present disclosure. 
           [0031]      FIGS. 11(A), 11(B) and 11(C)  are partial cross-sectional views for explaining a manufacturing method of the eighth embodiment of the electronic component of the present disclosure. 
           [0032]      FIGS. 12(A), 12(B) and 12(C)  are partially enlarged cross-sectional views for explaining another embodiment of the electronic component of the present disclosure. 
           [0033]      FIG. 13  is a cross-sectional view of a conventional electronic component. 
           [0034]      FIG. 14  is a cross-sectional view of another conventional electronic component. 
           [0035]      FIG. 15  is a cross-sectional view of yet another conventional electronic component. 
       
    
    
     DETAILED DESCRIPTION 
       [0036]    One or more embodiments of the present disclosure includes an element body having a circuit element therein and a terminal formed on the element body. The terminal is formed over an end surface and four surfaces adjacent to the end surface of the element body. On the element body on which the terminal is formed, an insulating film is formed to cover the terminal. The terminal is exposed from the insulating film at least on a mounting surface of the element body. This insulating film has a removed part formed on at least the mounting surface of the element body in which the terminal is exposed on the bottom surface. A plating film is formed on the terminal exposed from this insulating film. An external terminal is formed of the terminal covered with this insulating film and the plating film. 
         [0037]    Therefore, in one or more embodiments of the present disclosure, since the terminal formed on the element body is covered with the insulating film, the terminal may electrically be insulated from the surrounding by the insulating film and may be connected to a wiring pattern of a mounting substrate by the plating film formed in the removed part of the insulating film. Additionally, in one or more embodiments of the present disclosure, since it is not necessary to make the shape of the circuit element built in the element body into a special structure, a conventional electronic component before improvement as shown in  FIGS. 13 and 14  may be utilized without a change, and the characteristics of the circuit element may be improved by effectively utilizing a space inside the element body. Furthermore, in one or more embodiments of the present disclosure, since the terminal is exposed on the bottom surface of the removed part of the insulating film on the mounting surface of the element body and the plating film is formed on the removed part, the thickness of the end portion of the insulating film may be increased as compared to a conventional thickness, and the plating film for blocking entry of solder may be included, so that the entry of solder between the terminal and the insulating film can be prevented at the time of connection to the wiring pattern of the mounting substrate. Moreover, by applying a base plating and a tin or tin alloy plating onto the terminal exposed on the removed part, the solder leaching of the terminal may be prevented and the solder wettability may be made better. Furthermore, in the case of using an element body of ferrite or the like tending to cause elongation of plating, since the terminal is covered with the insulating film except a portion on which a plating film is formed, the terminal may be prevented from varying in width due to occurrence of the elongation of plating in a contact portion between the element body and the terminal when the plating is applied. In the case of using an element body with low density to form the electronic component with the element body entirely covered with a resin, it is not necessary to impregnate the element body with the resin. Moreover, the electronic component of the present disclosure may have a shape of an external terminal formed into various shapes depending on a shape of the removed part. 
         [0038]    Preferred embodiments for carrying out the present disclosure will hereinafter be described with reference to  FIGS. 1 to 12 . 
         [0039]      FIG. 1  is a partial cross-sectional view of a first embodiment of the electronic component of the present disclosure, and  11  and  12  denote an element body and a terminal, respectively. 
         [0040]    An element body  11  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material and has a circuit element formed therein. The circuit element is formed inside the element body by laminating insulator layers and conductor patterns and helically connecting the conductor patterns between the insulator layers to form a coil, by laminating insulator layers and conductor patterns and acquiring a capacitance between the conductor patterns to form a capacitor, by integrally forming the coil and the capacitor to form an LC circuit, or by disposing a coil of wound conductive wires inside. 
         [0041]    The terminals  12  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  11 . The terminals  12  are formed by forming electrodes by using a technique such as dip coating of a material containing a conductor such as silver, palladium, and copper. 
         [0042]    The element body  11  with the terminals  12  formed thereon is entirely covered with an insulating film  13 . The insulating film  13  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass. Removed parts in which the terminals  12  are exposed on bottom surfaces are formed in portions corresponding to the terminals  12  on a mounting surface of the element body  11 , and plating films  14  connected to the terminals  12  are formed in these removed parts. The plating films  14  are formed by forming base plating films  14 A made of a conductive material such as copper and nickel on surfaces of the terminals  12  and forming plating films  14 B made of tin or a tin alloy on surfaces of the base plating films  14 A. External terminals are formed of the terminals  12  covered with the insulating film  13  and the plating films  14 . 
         [0043]    For the electronic component formed in this way, first, an element body is formed with a circuit element formed therein by laminating insulator layers and conductor patterns and helically connecting the conductor patterns between the insulator layers to form a coil, by laminating insulator layers and conductor patterns and acquiring a capacitance between the conductor patterns to form a capacitor, by integrally forming the coil and the capacitor to form an LC circuit, or by disposing a coil of wound conductive wires on the inside. As shown in  FIG. 2(A) , this element body has terminals  22  each formed over an end surface and four surfaces adjacent to the end surface of an element body  21 . The terminals are formed by sintering a conductive paste containing a conductive material such as silver, palladium, and copper applied through coating or the like to the element body  21 , or by curing or sintering a conductive paste containing a conductive material such as silver, palladium, and copper and a resin applied through coating or the like to the element body  21 . 
         [0044]    Subsequently, the element body  21  having the terminals  22  formed thereon is entirely coated by applying a resin such as an epoxy resin, a silicone resin, and an acrylic resin or an insulator having an insulating property such as glass so that, as shown in  FIG. 2(B) , the element body  21  having the terminals  22  formed thereon is entirely covered with an insulating film  23 . The insulating film  23  preferably has a thickness of 2 to 30 μm. A method of the coating may be various methods such as application by dipping or spraying, electrodeposition coating, drum type rotary coating or the like. 
         [0045]    Subsequently, portions of the insulating film  23  corresponding to the terminals  22  on a mounting surface of the element body  21  are exfoliated and removed by heating with a laser device or a heat source device or by a mechanical method such as sandblasting and polishing so as to form removed parts  23 A with surfaces of the terminals  22  exposed on bottom surfaces thereof as shown in  FIG. 2(C) . 
         [0046]    Base plating films  24 A made of a conductive material such as copper and nickel are further formed on the surfaces of the terminals  22  exposed on the bottom surfaces of the removed parts  23 A, and plating films  24 B made of tin or a tin alloy are formed on surfaces of the base plating films  24 A, and thereby forming plating films  24  connected to the terminals  22  in the removed parts as shown in  FIG. 2(D) . 
         [0047]      FIG. 3  is a partial cross-sectional view for explaining a second embodiment of the electronic component of the present disclosure and a manufacturing method thereof. 
         [0048]    In the present embodiment, the structures of the removed parts and the external terminals are different from those of the first embodiment. First, with regard to the removed parts, as shown in  FIG. 3(A) , at a position corresponding to each of terminals  32 , a plurality of removed parts extending in the width direction of an element body  31  are arranged and formed in the length direction of the element body  31 . 
         [0049]    Subsequently, as shown in  FIG. 3(B) , base plating films  34 A made of a conductive material such as copper and nickel are formed on surfaces of the terminals  32  exposed on bottom surfaces of a plurality of removed parts  33 A 1 ,  33 A 2 , and plating films  34 B made of tin or a tin alloy are formed on surfaces of the base plating films  34 A, and thereby forming plating films  34  connected to the terminals  32  on the removed parts. 
         [0050]    When the electronic component is formed in this way, a plurality of plating films extending in the width direction of the element body are formed on each of the terminals and, therefore, at the time of connection to a wiring pattern of a mounting substrate by solder, a solder fillet may be allowed to enter between the plating films so that the mounting on the mounting substrate may be made stable. 
         [0051]      FIG. 4  is a partial cross-sectional view of a third embodiment of the electronic component of the present disclosure. 
         [0052]    An element body  41  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material and has a circuit element formed therein. 
         [0053]    Terminals  42  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  41 . The terminals  42  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. 
         [0054]    The element body  41  with the terminals  42  formed thereon is entirely covered with an insulating film  43 . The insulating film  43  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass, and removed parts formed in which the terminals  42  are exposed on bottom surfaces are formed in portions corresponding to the terminals  42  on a mounting surface and respective surfaces adjacent to the mounting surface of the element body  41 , and plating films  44  connected to the terminals  42  are formed in these removed parts. The plating films  44  are formed by forming base plating films  44 A made of a conductive material such as copper and nickel on surfaces of the terminals  42  and forming plating films  44 B made of tin or a tin alloy on surfaces of the base plating films  44 A. External terminals are formed of the terminals  42  covered with the insulating film  43  and the plating films  44 . The external terminals are each formed into an L shape over the mounting surface and a surface adjacent to the mounting surface of the electronic component. The shape of the external terminals may be changed in accordance with the shape of the removed parts and may be extended to the surface opposite to the mounting surface, and thereby forming the U-shaped external terminals. 
         [0055]      FIG. 5  is a partial cross-sectional view of a fourth embodiment of the electronic component of the present disclosure. 
         [0056]    An element body  51  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material. 
         [0057]    Terminals  52  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  51 . The terminals  52  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. 
         [0058]    The element body  51  with the terminals  52  formed thereon has respective insulating films  53  formed on both end portions of the element body  52  with the terminals  52  formed thereon such that the terminals  52  are covered. Each of the insulating films  53  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass, and a removed part in which the terminal is exposed on a bottom surface is formed in a portion corresponding to the terminal  52  on a mounting surface of the element body  51 , and a plating film  54  connected to the terminal  52  is formed in this removed part. The removed part is formed to be smaller than the area of the insulating film  53  on the mounting surface. The plating film  54  is formed by forming a base plating film  54 A made of a conductive material such as copper and nickel on a surface of the terminals  52  and forming a plating film  54 B made of tin or a tin alloy on a surface of the base plating film  54 A. External terminals are formed of the terminals  52  covered with the insulating films  53  and the plating films  54 . 
         [0059]    Even if the electronic component is formed in this way, solder may be prevented from entering between a terminal and an insulating film and the insulating material of the insulating films may be saved. 
         [0060]      FIG. 6  is a partial cross-sectional view of a fifth embodiment of the electronic component of the present disclosure. 
         [0061]    An element body  61  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material and has a circuit element formed therein. 
         [0062]    Terminals  62  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  61 . The terminals  62  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. Base plating films  64 A are formed on surfaces of the terminals  62 . The base plating films  64 A are made of a conductive material such as copper and nickel and each have a thickness made larger in a portion corresponding to a mounting surface of the element body  61  than the thickness of the other portion. 
         [0063]    This element body  61  is entirely covered with an insulating film  63  such that the surfaces of the thicker portions of the base plating films  64 A are exposed in removed parts. The insulating film  63  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass. Plating films  64 B made of tin or a tin alloy are formed on the surfaces of the thicker portions of the base plating films  64 A exposed in the removed parts. Plating films  64  are formed of the base plating films  64 A and the plating films  64 B made of tin or a tin alloy, and external terminals are formed of the plating films  64  and the terminals  62 . 
         [0064]    For the electronic component formed in this way, first, an element body is formed with a circuit element formed therein. As shown in  FIG. 7(A) , this element body has terminals  72  each formed over an end surface and four surfaces adjacent to the end surface of an element body  71 . The terminals  72  are formed by curing or sintering a conductive paste containing a conductive material such as silver, palladium, and copper and a resin applied through coating or the like to the element body  71 . 
         [0065]    As shown in  FIG. 7(B) , base plating films  74 A 1  made of a conductive material such as copper and nickel are formed on surfaces of the terminals  72 . 
         [0066]    Subsequently, the element body  71  is entirely coated by applying a resin such as an epoxy resin, a silicone resin, and an acrylic resin or an insulator having an insulating property such as glass so that, as shown in  FIG. 7(C) , the element body  71  is entirely covered with an insulating film  73 . The insulating film  73  preferably has a thickness of 2 to 30μm. A method of the coating may be various methods such as application by dipping or spraying, electrodeposition coating, and drum type rotary coating. 
         [0067]    Portions of the insulating film  73  corresponding to the terminals  72  on a mounting surface of the element body  71  are exfoliated and removed by heating with a laser device or a heat source device or by a mechanical method such as sandblasting and polishing, and thereby forming removed parts  73 A with surfaces of the base plating films  74 A 1  exposed on bottom surfaces thereof as shown in  FIG. 7(D) . 
         [0068]    Subsequently, base plating films  74 A 2  made of a conductive material such as copper and nickel are formed on the surfaces of the base plating films  74 A 1  exposed on the bottom surfaces of the removed parts  73 A, and plating films  74 B made of tin or a tin alloy are formed on surfaces of the base plating films  74 A 2  and thereby forming plating films  74  connected to the terminals  72  in the removed parts as shown in  FIG. 7(E) . In this case, the base plating films  74 A 1  and the base plating films  74 A 2  may be made of the same material or may be made of different materials. Alternatively, the plating films  74 B made of tin or a tin alloy may be formed on the surfaces of the base plating films  74 A 1  to form the plating films  74  connected to the terminals  72  in the removed parts. 
         [0069]    In the case of the electronic component formed in this way, even if the base plating films  74 A 2  formed in the removed parts  73 A and the plating films  74 B made of tin or a tin alloy are insufficiently formed so that a gap from a resin film is generated, the solder leaching of the terminals may be prevented since the terminals are covered with the base plating films  74 A 1 . 
         [0070]      FIG. 8  is a partial cross-sectional view of a sixth embodiment of the electronic component of the present disclosure. 
         [0071]    An element body  81  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material and has a circuit element formed therein. 
         [0072]    Terminals  82  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  81 . The terminals  82  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. Base plating films  84 A are formed on surfaces of the terminals  82 . The base plating films  84 A are made of a conductive material such as copper and nickel and each have a thickness made larger in a portion corresponding to a mounting surface and a surface adjacent to the mounting surface of the element body  81  than the thickness of the other portion. 
         [0073]    This element body  81  is entirely covered with an insulating film  83  such that the surfaces of the thicker portions of the base plating films  84 A are exposed in removed parts. The insulating film  83  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass. The removed parts are formed in the portions corresponding to the terminals  82  on the mounting surface and the respective surfaces adjacent to the mounting surface of the element body  81 . Plating films  84 B made of tin or a tin alloy are formed on the surfaces of the thicker portions of the base plating films  84 A exposed in the removed parts. Plating films  84  are formed of the base plating films  84 A and the plating films  84 B made of tin or a tin alloy, and external terminals are formed of the plating films  84  and the terminals  82 . The external terminals are each formed into an L shape over the mounting surface and a surface adjacent to the mounting surface of the electronic component. The shape of the external terminals may be changed in accordance with the shape of the removed parts and may be extended to the surface opposite to the mounting surface and thereby forming the U-shaped external terminals. 
         [0074]      FIG. 9  is a partial cross-sectional view of a seventh embodiment of the electronic component of the present disclosure. 
         [0075]    An element body  91  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material. 
         [0076]    Terminals  92  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  91 . The terminals  92  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. Base plating films  94 A are formed on surfaces of the terminals  92 . The base plating films  94 A are made of a conductive material such as copper and nickel and each have a thickness made larger in a portion corresponding to a mounting surface and a surface adjacent to the mounting surface of the element body  91  than the thickness of the other portion. 
         [0077]    This element body  91  has insulating films  93  formed on portions of the terminals  92  on both end portions of the element body  91  such that the surfaces of the thicker portions of the base plating films  94 A are exposed in removed parts. Each of the insulating films  93  is made of a resin such as an epoxy resin, a silicone resin, and an acrylic resin, or an insulator having an insulating property such as glass. The removed parts are formed such that the insulating film  93  partially remains on the mounting surface of the element body  91 . Plating films  94 B made of tin or a tin alloy are formed on the surfaces of the thicker portions of the base plating films  94 A. Plating films  94  are formed of the base plating films  94 A and the plating films  94 B made of tin or a tin alloy, and external terminals are formed of the plating films  94  and the terminals  92 . 
         [0078]      FIG. 10  is a partial cross-sectional view of an eighth embodiment of the electronic component of the present disclosure. 
         [0079]    An element body  101  is made of a magnetic material such as ferrite, a metallic magnetic material, and an insulator such as a dielectric material. 
         [0080]    Terminals  102  are each formed over an end surface and four surfaces adjacent to the end surface of the element body  101 . The terminals  102  are formed by forming electrodes by using a material containing a conductor such as silver, palladium, and copper. Base plating films  104 A are formed on surfaces of the terminals  102 . The base plating films  104 A are made of a conductive material such as copper and nickel and each have a thickness made larger in a lower portion of the element body  101  than the thickness of the other portion. 
         [0081]    This element body  101  has an insulating film  103  formed on an upper portion of the element body  101  such that the surfaces of the thicker portions of the base plating films  104 A are exposed in the lower portion of the element body  101 , and plating films  104  are formed with plating films  104 B made of tin or a tin alloy on the surfaces of the thicker portions of the base plating films  104 A. The plating films  104  are formed of the base plating films  104 A and the plating films  104 B made of tin or a tin alloy, and external terminals are formed of the plating films  104  and the terminals  102 . 
         [0082]    For the electronic component formed in this way, first, an element body is formed with a circuit element formed therein. As shown in  FIG. 11(A) , this element body has terminals  112  each formed over an end surface and four surfaces adjacent to the end surface of an element body  111 . The terminals  112  are formed by curing or sintering a conductive paste containing a conductive material such as silver, palladium, and copper and a resin applied through coating or the like to the element body  111 . Base plating films  114 A 1  made of a conductive material such as copper and nickel are formed on surfaces of the terminals  112 . 
         [0083]    Next, an upper side of the element body  111  is then coated by applying a resin such as an epoxy resin, a silicone resin, and an acrylic resin or an insulator having an insulating property such as glass so that, as shown in  FIG. 11(B) , an upper portion of the element body  111  is covered with an insulating film  113 . The insulating film  113  preferably has a thickness of 2 to 30 μm. A method of the coating may be various methods such as application by dipping or spraying, electrodeposition coating, and drum type rotary coating. 
         [0084]    Subsequently, base plating films  114 A 2  made of a conductive material such as copper and nickel are formed on the surfaces of the base plating films  114 A 1  exposed on a lower portion of the element body  111 , and plating films  114 B made of tin or a tin alloy are formed on surfaces of the base plating films  114 A 2  and thereby forming plating films  114  connected to the terminals  112  as shown in  FIG. 11(C) . In this case, the base plating films  114 A 1  and the base plating films  114 A 2  may be made of the same material or may be made of different materials. If the base plating films  114 A 1  and the base plating films  114 A 2  are made of the same material, as shown in  FIG. 10 , thicker portions are formed in the base plating films, and the thicker portions of the base plating films are exposed from the insulating film  113 . Alternatively, if the base plating films  114 A 1  and the base plating films  114 A 2  are made of different materials, the base plating films  114 A 1  may preferably be made of copper and the base plating films  114 A 2  may be made of nickel. 
         [0085]    Plating films  114 B made of tin or a tin alloy are further formed on the surfaces of the base plating films  114 A 1  and thereby forming plating films  114  connected to the terminals  112 . 
         [0086]    In the case of the electronic component formed in this way, the insulating film is formed on the element body after the base plating is formed on the entire terminals and, therefore, even if a gap exists between the insulating film  113  and each of the base plating films  114 A 2  and the plating films  114 B made of a tin alloy, solder does not reach the terminals at the time of connection to the wiring pattern of the mounting board, and no solder leaching occurs in the terminals. Since the base plating films are formed again after forming the insulating film so that the plating films made of tin or a tin alloy are formed, the solder wettability may also be improved. 
         [0087]    Although the embodiments of the electronic component and the method of manufacturing the same according to the present disclosure have been described, the present disclosure is not limited to the embodiments. For example, in the first to seventh embodiments, a plating film formed in a removed part of an insulating film may be formed such that a surface of a plating film  124  is at the same level as a surface of an insulating film  123  as shown in  FIG. 12(A) , such that the surface of the plating film  124  is formed in a removed part  123 A as shown in  FIG. 12(B) , or such that the surface of the plating film  124  projects from the surface of the plating film  123  as shown in  FIG. 12(C) . If the surface of the plating film  124  projects from the surface of the insulating film  123 , the area of the surface may be formed larger than that of the removed part, or a portion of the plating film projecting from the surface of the insulating film may be formed of a plating film made of tin or a tin alloy. 
         [0088]    In the first to fourth embodiments, the base plating films  14 A,  34 A,  44 A,  54 A may be formed to extend between the terminals and the insulating film so as to cover the terminals. 
         [0089]    In the eighth embodiment, the plating films  114 B made of tin or a tin alloy may be formed on the surfaces of the base plating films  114 A 1 . 
         [0090]    For the terminals, metal plates may each be processed to cover an end surface and four surfaces adjacent to the end surface of an element body and may be attached to both ends of the element body, or electrodes or the like may each be formed over an end surface and at least one surface adjacent to the end surface of the element body to form various shapes such as an L shape and a U shape.