Patent Publication Number: US-2021174997-A1

Title: Laminated electronic component

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Divisional of U.S. patent application Ser. No. 15/711,388 filed on Sep. 21, 2017, which claims priority to Japanese Patent Application No. 2016-187242, filed on Sep. 26, 2016, the disclosure of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a laminated electronic component having a coil formed in a laminated body. 
     BACKGROUND 
     As shown in  FIGS. 6 and 7 , conventional laminated electronic components include a component having a coil formed in a laminated body by laminating magnetic material layers  61 A to  61 F and conductor patterns  62 A to  62 E and by spirally connecting the conductor patterns  62 A to  62 E between the magnetic material layers with lead-out ends of the coil led out to longitudinal-direction side surfaces of the laminated body so that the coil is connected between external terminals  65 ,  66  formed on the longitudinal-direction side surfaces of the laminated body and four surfaces adjacent to these side surfaces. 
     In recent years, because of miniaturization and higher functionality of mobile devices on which this kind of electronic components is mounted, the number of electronic circuits required for these devices has increased and an area of a mounting board has become smaller. Accordingly, electronic components used for these devices are required to be reduced in size and thickness. Additionally, lower voltages are increasingly used in these devices, so that inductors used in these devices are required to be further improved in DC superposition characteristics. Furthermore, minimization of land patterns for mounting and minimization of distance between adjacent electronic components are performed on mounting boards of these devices so as to mount the electronic components at higher density, and inductors to be mounted on the mounting boards of these devices must be mounted at high density. 
     One method of improving DC superimposition characteristics of an inductor is to use a material with a high maximum magnetic flux density for a magnetic material constituting an element body of the inductor. Although the conventional laminated electronic components typically have a laminated body made of ferrite, the maximum magnetic flux density of ferrite is as low as about 0.4 T. Therefore, the conventional laminated electronic components have a problem that magnetic saturation easily occurs when a large current is applied. To solve such a problem, the material of the laminated body is switched from ferrite to a metal magnetic material having a high saturation magnetic flux density so as to improve the DC superimposition characteristics (see, e.g., Japanese Laid-Open Patent Publication No. 2013-45985). 
     However, a metal magnetic material has a lower volume resistivity of material and a lower withstand voltage as compared to ferrite. Therefore, to ensure the insulation and the withstand voltage of the inductor in the conventional laminated electronic components, it is necessary to ensure a sufficient distance between external terminals and to ensure a sufficient distance between positions causing a potential difference, so that it is difficult to achieve sufficient miniaturization. To solve such a problem, the volume resistivity and the withstand voltage are improved by covering a surface of a laminated body having a coil formed therein with ceramics etc. having a high withstand voltage (see, e.g., Japanese Patent No. 5190331). 
     The conventional laminated electronic components have external terminals formed on the longitudinal-direction side surfaces of the laminated body and four surfaces adjacent to these side surfaces and therefore have a problem that a solder bridge is formed between the external terminals of adjacent electronic components due to a solder fillet at the time of mounting and soldering on a mounting board, a positional displacement of a mounting position at the time of mounting on the mounting board, etc., causing a short circuit. Therefore, it is difficult to mount the electronic components on a mounting board on which the components are mounted at a high density as described above. To solve such a problem, a laminated electronic component having external terminals formed on the longitudinal-direction side surfaces of the laminated body and four surfaces adjacent to these side surfaces is covered with an insulator film except a bottom surface (see, e.g., Japanese Laid-Open Patent Publication No. 2012-256758). 
     On the other hand, as shown in  FIGS. 8 and 9 , magnetic material layers  81 A to  81 E are provided with conductor patterns  82 A to  82 E and conductors  83 ,  84  penetrating the magnetic material layers, and a coil is formed in a laminated body by laminating the magnetic material layers  81 A to  81 F and the conductor patterns  82 A to  82 E and by spirally connecting the conductor patterns  82 A to  82 E between the magnetic material layers in the laminated body provided with the conductors  83 ,  84  such that both ends of the coil are led out by the conductors  83 ,  84  to a bottom surface of the laminated body and connected to external terminals  85 ,  86  formed on the bottom surface of the laminated body (see, e.g., Japanese Examined Patent Application Publication No. 62-29886). 
     SUMMARY 
     The present disclosure provides a laminated electronic component having a coil formed in a laminated body of pluralities of alternately laminated magnetic material layers and conductor patterns by electrically connecting the conductor patterns adjacent to each other via the magnetic material layers. The magnetic material layers contain a metal magnetic material. The coil has a first end portion close to a bottom surface of the laminated body and a second end portion distant from the bottom surface of the laminated body. The first end portion is electrically connected to a first external terminal disposed on the bottom surface of the laminated body. The second end portion is electrically connected to a second external terminal disposed on the bottom surface of the laminated body via an electrode disposed on a side surface of the laminated body. The electrode is covered with an insulator film. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a first embodiment of a laminated electronic component of the present disclosure. 
         FIG. 2  is a perspective view of the first embodiment of the laminated electronic component of the present disclosure. 
         FIG. 3  is an exploded perspective view of a second embodiment of the laminated electronic component of the present disclosure. 
         FIG. 4A  is a perspective view for explaining a manufacturing method of the second embodiment of the laminated electronic component of the present disclosure. 
         FIG. 4B  is a perspective view for explaining a manufacturing method of the second embodiment of the laminated electronic component of the present disclosure. 
         FIG. 4C  is a perspective view for explaining a manufacturing method of the second embodiment of the laminated electronic component of the present disclosure. 
         FIG. 5  is an exploded perspective view of a third embodiment of the laminated electronic component of the present disclosure. 
         FIG. 6  is an exploded perspective view of a conventional laminated electronic component. 
         FIG. 7  is a perspective view of the conventional laminated electronic component. 
         FIG. 8  is an exploded perspective view of another conventional laminated electronic component. 
         FIG. 9  is a perspective view of the other conventional laminated electronic component. 
     
    
    
     DETAILED DESCRIPTION 
     However, in the laminated electronic component described in Japanese Laid-Open Patent Publication No. 2012-256758, since the thickness of the insulator film is added to the element dimension, the shape of the laminated body must be made smaller by the thickness of the insulator film, and the component has a problem that the desired inductance and DC superimposition characteristics are difficult to ensure. In the laminated electronic component described in Japanese Examined Patent Application Publication No. 62-29886, a sufficient distance must be ensured between the coil and the conductors so as to ensure insulation and withstand voltage in the laminated body, and the component has a problem that the desired inductance and DC superimposition characteristics are difficult to ensure. Furthermore, since such a conventional laminated electronic component has the conductors disposed in the laminated body such that both ends of the coil are connected to the external electrodes, it is difficult to ensure a sufficient magnetic flux passing area in the laminated body as compared to the conventional laminated electronic component shown in  FIGS. 6 and 7 , and the component has a problem that a desired inductance is not acquired or, even if the desired inductance is acquired, it is difficult to ensure the DC superimposition characteristics without increasing the resistance value of the coil. 
     It is an object of the present disclosure to solve these problems and to provide a laminated electronic component using a metal magnetic material, having excellent DC superimposition characteristics and higher insulation and withstand voltage characteristics, and suitable for high-density mounting. 
     The present disclosure provides a laminated electronic component having a coil formed in a laminated body by laminating pluralities of magnetic material layers and conductor patterns and by connecting the conductor patterns between the magnetic material layers. The magnetic material layers are made of a metal magnetic material. The coil has a lead-out end (first end portion) close to a bottom surface of the laminated body led out to the bottom surface of the laminated body and a lead-out end (second end portion) distant from the bottom surface of the laminated body led out to a side surface of the laminated body. The first end portion is connected to a first external terminal disposed on the bottom surface of the laminated body. The second end portion is connected to a second external terminal disposed on the bottom surface of the laminated body via an electrode disposed on the side surface of the laminated body. The electrode disposed on the side surface of the laminated body is covered with an insulator film. 
     In other words, the present disclosure provides a laminated electronic component which includes a coil and a laminated body. The coil is formed in the laminated body of pluralities of alternately laminated magnetic material layers and conductor patterns by electrically connecting the conductor patterns adjacent to each other via the magnetic material layers. The magnetic material layers contain a metal magnetic material, wherein the coil has a first end portion close to a bottom surface of the laminated body and a second end portion distant from the bottom surface of the laminated body. The first end portion is electrically connected to a first external terminal disposed on the bottom surface of the laminated body. The second end portion is electrically connected to a second external terminal disposed on the bottom surface of the laminated body via an electrode disposed on a side surface of the laminated body. The electrode is covered with an insulator film. 
     The present disclosure also provides a laminated electronic component having a coil formed in a laminated body by laminating pluralities of magnetic material layers and conductor patterns and by connecting the conductor patterns between the magnetic material layers. The magnetic material layers are made of a metal magnetic material. The coil has a lead-out end (first end portion) close to a bottom surface of the laminated body led out to the bottom surface of the laminated body and a lead-out end (second end portion) distant from the bottom surface of the laminated body led out to a side surface of the laminated body. The lead-out end (first end portion) of the coil close to the bottom surface of the laminated body is connected to a first external terminal formed on the bottom surface of the laminated body. The lead-out end (second end portion) of the coil distant from the bottom surface of the laminated body is connected to a second external terminal formed on the bottom surface of the laminated body via a conductor having a surface partially exposed on the side surface of the laminated body. The conductor exposed on the side surface of the laminated body is covered with an insulator film. 
     In other words, the present disclosure also provides a laminated electronic component including a coil and a laminated body. The coil is formed in the laminated body of pluralities of alternately laminated magnetic material layers and conductor patterns by electrically connecting the conductor patterns adjacent to each other via the magnetic material layers. The magnetic material layers contain a metal magnetic material, wherein the first end portion is connected to a first external terminal disposed on a bottom surface of the laminated body. The second end portion is connected to a second external terminal disposed on the bottom surface of the laminated body via a conductor embedded in a side surface of the laminated body with a surface thereof partially exposed. The exposed surface of the conductor is covered with an insulator film. 
     The laminated electronic component of the present disclosure has a coil formed in a laminated body by laminating magnetic material layers and conductor patterns and by connecting the conductor patterns between the magnetic material layers. The magnetic material layers are made of a metal magnetic material. The coil has a first end portion led out to a bottom surface of the laminated body and a second end portion led out to a side surface of the laminated body. The first end portion is connected to a first external terminal formed on the bottom surface of the laminated body. The second end portion of the coil is connected to a second external terminal formed on the bottom surface of the laminated body via an electrode formed on the side surface of the laminated body. The electrode formed on the side surface of the laminated body is covered with an insulator film. Therefore, the laminated electronic component has excellent DC superimposition characteristics and high insulation and withstand voltage characteristics and can be mounted at high density on a mounting board. 
     The laminated electronic component of the present disclosure has a coil formed in a laminated body by laminating magnetic material layers and conductor patterns and by connecting the conductor patterns between the magnetic material layers. The magnetic material layers are made of a metal magnetic material. The coil has a first end portion led out to a bottom surface of the laminated body and a second end portion led out to a side surface of the laminated body. The first end portion of the coil is connected to a first external terminal formed on the bottom surface of the laminated body. The second end portion of the coil is connected to a second external terminal formed on the bottom surface of the laminated body via a conductor having a surface partially exposed on the side surface of the laminated body. The conductor exposed on the side surface of the laminated body is covered with an insulator film. Therefore, the laminated electronic component has excellent DC superimposition characteristics and high insulation and withstand voltage characteristics and can be mounted at high density on a mounting board. 
     A laminated electronic component of the present disclosure has a coil formed in a laminated body by laminating magnetic material layers made of a metal magnetic material and conductor patterns and by connecting the conductor patterns between the magnetic material layers. The laminated body has a bottom surface orthogonal to a lamination direction and having an external terminal disposed thereon and a side surface adjacent to the bottom surface and parallel to the lamination direction. In the coil, a lead-out end (first end portion) close to the bottom surface of the laminated body is led out to the bottom surface of the laminated body, and a lead-out end (second end portion) distant from the bottom surface of the laminated body is led out to the side surface of the laminated body. The lead-out end of the coil close to the bottom surface of the laminated body is connected to a first external terminal formed on the bottom surface of the laminated body, and the lead-out end of the coil distant from the bottom surface of the laminated body is connected to a second external terminal formed on the bottom surface of the laminated body via an electrode formed on the side surface of the laminated body or a conductor embedded in the side surface with a surface thereof partially exposed on the side surface of the laminated body. The electrode formed on the side surface of the laminated body or the conductor having the surface partially exposed on the side surface of the laminated body is covered with an insulator film. 
     Therefore, the laminated electronic component of the present disclosure has no external terminal on the side surface of the laminated body, so that no solder fillet is formed on the side surface at the time of soldering to a mounting board. 
     In the laminated electronic component of the present disclosure, the distance between positions causing a potential difference and the magnetic flux passing area in the laminated body can be made larger than those of the conventional laminated electronic component shown in  FIGS. 8 and 9 . 
     Furthermore, since the laminated electronic component of the present disclosure has no external terminal formed on the side surface, the volume of the laminated body can be made larger than that of the conventional laminated electronic component shown in  FIGS. 6 and 7  by the volume of the external terminal and the insulator film on the side surface, which reduces the magnetic flux density per unit volume, so that the characteristics can be improved. 
     Additionally, the laminated electronic component may have an insulator part between the coil and the conductor. By providing the insulator part, better and higher insulation and withstand voltage characteristics can be achieved. 
     Embodiments 
     Embodiments of the laminated electronic component of the present disclosure will now be described with reference to  FIGS. 1 to 5 . 
       FIG. 1  is an exploded perspective view of a first embodiment of the laminated electronic component of the present disclosure. 
     In  FIG. 1 , reference numerals  10 ,  11 A to  11 G, and  12 A to  12 E denote a laminated body, magnetic material layers, and conductor patterns, respectively. 
     The laminated body  10  is formed by laminating the magnetic material layers  11 A to  11 G formed into a rectangular shape and the conductor patterns  12 A to  12 E. The laminated body  10  has a bottom surface orthogonal to a lamination direction and having an external terminal disposed thereon, and four side surfaces adjacent to the bottom surface and parallel to the lamination direction. The four side surfaces are two longitudinal-direction side surfaces perpendicular to the longitudinal direction of the rectangular magnetic material layers and two lateral-direction side surfaces parallel to the longitudinal direction of the magnetic material layers. The magnetic material layers  11 A to  11 G are made of a metal magnetic material such as metal magnetic powder of Fe, Si, Fe-Si-Cr, Fe-Si-Al, Fe-Ni-Al, Fe-Cr-Al, amorphous, etc. The conductor patterns  12 A to  12 E are made of a conductor paste that is a metal material such as silver, silver-based material, gold, gold-based material, copper, copper-based material, etc. made into a paste form. 
     The magnetic material layer  11 A is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 A described later. A conductor  13  having the same thickness as the magnetic material layer  11 A is formed in the through-hole of the magnetic material layer  11 A. The conductor  13  is formed by printing using the same material as the material forming the conductor patterns described later. 
     The magnetic material layer  11 B is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 A formed on an upper surface that is the surface on the side opposite to the bottom surface of the laminated body  10 . In the through-hole, a conductor having the same thickness as the magnetic material layer  11 B is formed by printing using the same material as the material forming the conductor pattern  12 A. The conductor pattern  12 A is formed for less than one turn and has one end connected to the conductor  13  via the conductor in the through-hole formed in the magnetic material layer  11 B. 
     The magnetic material layer  11 C is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 B formed on the upper surface. In the through-hole, a conductor having the same thickness as the magnetic material layer  11 C is formed by printing using the same material as the material forming the conductor pattern  12 B. The conductor pattern  12 B is formed for less than one turn and has one end connected to the other end of the conductor pattern  12 A via the conductor in the through-hole formed in the magnetic material layer  11 C. 
     The magnetic material layer  11 D is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 C formed on the upper surface. In the through-hole, a conductor having the same thickness as the magnetic material layer  11 D is formed by printing using the same material as the material forming the conductor pattern  12 C. The conductor pattern  12 C is formed for less than one turn and has one end connected to the other end of the conductor pattern  12 B via the conductor in the through-hole formed in the magnetic material layer  11 D. 
     The magnetic material layer  11 E is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 D formed on the upper surface. In the through-hole, a conductor having the same thickness as the magnetic material layer  11 E is formed by printing using the same material as the material forming the conductor pattern  12 D. The conductor pattern  12 D is formed for less than one turn and has one end connected to the other end of the conductor pattern  12 C via the conductor in the through-hole formed in the magnetic material layer  11 E. 
     The magnetic material layer  11 F is formed into a rectangular sheet shape and has a through-hole formed at a position corresponding to one end of the conductor pattern  12 E formed on the upper surface. In the through-hole, a conductor having the same thickness as the magnetic material layer  11 F is formed by printing using the same material as the material forming the conductor pattern  12 E. The conductor pattern  12 E is formed for less than one turn and has one end connected to the other end of the conductor pattern  12 D via the conductor in the through-hole formed in the magnetic material layer  11 F and the other end led out to the longitudinal-direction side surface. 
     The magnetic material layer  11 G for protecting the conductor pattern is formed on the magnetic material layer  11 F having the conductor pattern  12 E formed thereon. 
     By spirally connecting the conductor patterns  12 A to  12 E between the magnetic material layers in this way, a coil pattern is formed in the laminated body. In this coil pattern, a lead-out end (first end portion) close to the bottom surface of the laminated body  10  is connected to the conductor  13  and exposed on the bottom surface of the laminated body  10 , and a lead-out end (second end portion) of the coil pattern distant from the bottom surface of the laminated body  10  is exposed on the longitudinal-direction side surface of the laminated body  10 . As shown in  FIG. 2 , a first external terminal  15  and a second external terminal  16  are formed on the bottom surface of the laminated body  10 , and an electrode  17  connected to the second external terminal  16  is formed on the longitudinal-direction side surface on which the lead-out end (second end portion) of the coil pattern is exposed. The electrode  17  is covered with an insulator film  18  formed on the longitudinal-direction side surface of the laminated body  10 . The insulator film  18  is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the laminated body  10 . 
     The first end portion of the coil is connected to the first external terminal  15  via the conductor  13  and the second end portion of the coil is connected to the second external portion  16  via the electrode  17  formed on the longitudinal-direction side surface of the laminated body  10 , so that the coil is connected between the first external terminal  15  and the second external terminal  16 . 
       FIG. 3  is an exploded perspective view of a second embodiment of the laminated electronic component of the present disclosure. In the second embodiment, instead of providing the electrode on the side surface, a conductor is embedded in the side surface with a surface partially exposed. 
     A magnetic material layer  31 A is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of a conductor pattern  32 A described later. A conductor  33  having the same thickness as the magnetic material layer  31 A is formed in the through-hole of the magnetic material layer  31 A. A conductor  34 A having the same thickness as the magnetic material layer  31 A is formed in the cutout formed in the magnetic material layer  31 A. The conductor  33  and the conductor  34 A are formed by printing using the same material as the material forming the conductor pattern. 
     The magnetic material layer  31 B is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of the conductor pattern  32 A described later. In the through-hole, a conductor having the same thickness as the magnetic material layer  31 B is formed by printing using the same material as the material forming the conductor pattern  32 A. The conductor pattern  32 A is formed on the upper surface of the magnetic material layer  31 B. This conductor pattern  32 A is formed for less than one turn and has one end connected to the conductor  33  via the conductor in the through-hole formed in the magnetic material layer  31 B. A conductor  34 B having the same thickness as the magnetic material layer  31 B is formed in the cutout formed in the magnetic material layer  31 B. The conductor  34 B is formed by printing using the same material as the conductor pattern  32 A. 
     A magnetic material layer  31 C is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of a conductor pattern  32 B described later. In the through-hole, a conductor having the same thickness as the magnetic material layer  31 C is formed by printing using the same material as the material forming the conductor pattern  32 B. The conductor pattern  32 B is formed on the upper surface of the magnetic material layer  31 C. This conductor pattern  32 B is formed for less than one turn and has one end connected to the other end of the conductor pattern  32 A via the conductor in the through-hole formed in the magnetic material layer  31 C. A conductor  34 C having the same thickness as the magnetic material layer  31 C is formed in the cutout of the magnetic material layer  31 C. The conductor  34 C is formed by printing using the same material as the conductor pattern  32 B. 
     A magnetic material layer  31 D is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of a conductor pattern  32 C described later. In the through-hole, a conductor having the same thickness as the magnetic material layer  31 D is formed by printing using the same material as the material forming the conductor pattern  32 C. The conductor pattern  32 C is formed on the upper surface of the magnetic material layer  31 D. This conductor pattern  32 C is formed for less than one turn and has one end connected to the other end of the conductor pattern  32 B via the conductor in the through-hole formed in the magnetic material layer  31 D. A conductor  34 D having the same thickness as the magnetic material layer  31 D is formed in the cutout of the magnetic material layer  31 D. The conductor  34 D is formed by printing using the same material as the conductor pattern  32 C. 
     A magnetic material layer  31 E is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of a conductor pattern  32 D described later. In the through-hole, a conductor having the same thickness as the magnetic material layer  31 E is formed by printing using the same material as the material forming the conductor pattern  32 D. The conductor pattern  32 D is formed on the upper surface of the magnetic material layer  31 E. This conductor pattern  32 D is formed for less than one turn and has one end connected to the other end of the conductor pattern  32 C via the conductor in the through-hole formed in the magnetic material layer  31 E. A conductor  34 E having the same thickness as the magnetic material layer  31 E is formed in the cutout of the magnetic material layer  31 E. The conductor  34 E is formed by printing using the same material as the conductor pattern  32 D. 
     A magnetic material layer  31 F is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces and a through-hole formed at a position corresponding to one end of a conductor pattern  32 E described later. In the through-hole, a conductor having the same thickness as the magnetic material layer  31 F is formed by printing using the same material as the material forming the conductor pattern  32 E. In the conductor pattern  32 E less than one turn is formed on the upper surface of the magnetic material layer  31 F. A conductor  34 F having the same thickness as the magnetic material layer  31 F is formed in the cutout of the magnetic material layer  31 F. The conductor  34 F is formed by printing using the same material as the conductor pattern  32 E. The conductor pattern  32 E has one end connected to the other end of the conductor pattern  32 D via the conductor in the through-hole formed in the magnetic material layer  31 F and the other end led out to the longitudinal-direction side surface of the magnetic material layer  31 F. 
     A magnetic material layer  31 G for protecting the conductor pattern is formed on the magnetic material layer  31 F having the conductor pattern  32 E formed thereon. 
     By spirally connecting the conductor patterns  32 A to  32 E between the magnetic material layers in this way, a coil pattern is formed in a laminated body. In this laminated body  30 , a portion of a surface of a conductor connected to the lead-out end (the first end portion) of the coil pattern is exposed on the bottom surface, and the second end portion of the coil pattern is exposed on the longitudinal-direction side surface of the laminated body  30  together with a portion of a surface of a conductor connected to the second end portion and embedded in the longitudinal-direction side surface. In this case, the conductor extends in the lamination direction of the magnetic material layers between the bottom surface of the laminated body  30  and the second end portion. This laminated body  30  has a pair of external terminals, that is a first external terminal and a second external terminal, formed on the bottom surface, and the lead-out ends of the coil pattern are respectively connected via the conductors so that a coil is connected between the paired external terminals. Furthermore, the surface of the conductor embedded with the surface partially exposed on the longitudinal-direction side surface of the laminated body  30  is covered with an insulator film formed on the longitudinal-direction side surface of the laminated body  30 . The insulator film is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the laminated body. 
     The laminated electronic component as described above is manufactured as follows. First, the magnetic material layers and the conductor patterns are laminated and the conductor patterns between the magnetic material layers are spirally connected to form the laminated body having the coil formed therein. The coil has the first end portion led out to the bottom surface of the laminated body and the second end portion led out to a longitudinal-direction side surface of the laminated body and, as shown in  FIG. 4A , the second end portion of the coil is led out to the bottom surface of the laminated body  30  via a conductor  34  having a surface partially exposed on the side surface of the laminated body. 
     As shown in  FIG. 4B , a first external terminal  35  and a second external terminal  36  are then formed on the bottom surface of the laminated body  30 , and the first end portion of the coil is connected via a conductor (not shown) to the first external terminal  35  while the second end portion of the coil is connected via the conductor  34  to the second external terminal  36  formed on the bottom surface of the laminated body. 
     Subsequently, as shown in  FIG. 4C , an insulator film  38  is formed on the side surface of the laminated body  30  in the longitudinal direction of the laminated body of the coil so as to cover the conductor  34  connecting the second end portion and the second external terminal  36 . 
       FIG. 5  is an exploded perspective view of a third embodiment of the laminated electronic component of the present disclosure. In the third embodiment, an insulator part is disposed between a conductor disposed on a side surface and a coil. 
     A magnetic material layer  51 A is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of a conductor pattern  52 A described later, and a second through-hole formed between the cutout and a portion close to the cutout at a position corresponding to the conductor pattern  52 A described later. A conductor  53  having the same thickness as the magnetic material layer  51 A is formed in the first through-hole at the position corresponding to the one end of the conductor pattern of the magnetic material layer  51 A. A conductor  54 A having the same thickness as the magnetic material layer  51 A is formed in the cutout formed in the magnetic material layer  51 A. The conductor  53  and the conductor  54 A are formed by printing using the same material as the material forming the conductor pattern. Additionally, an insulator part  59 A is formed in the second through-hole formed between the cutout and the portion close to the cutout at the position corresponding to the conductor pattern. The insulator part  59 A is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 A. 
     A magnetic material layer  51 B is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of the conductor pattern  52 A described later, and a second through-hole formed between the cutout and a portion of the conductor pattern  52 A described later close to the cutout. In the cutout formed in the magnetic material layer  51 B, a conductor  54 B having the same thickness as the magnetic material layer  51 B is formed by printing using the same material as the conductor pattern  52 A. A conductor is also formed in the first through-hole in the same way. In the conductor pattern  52 A less than one turn is formed on the upper surface of the magnetic material layer  51 B and has one end connected to the conductor  53  via the conductor in the first through-hole formed in the magnetic material layer  51 B. In the second through-hole formed between the cutout and the portion of the conductor pattern  52 A close to the cutout, an insulator part  59 B is formed having a thickness that is the sum of the thickness of the magnetic material layer  51 B and the thickness of the conductor pattern  52 A. The insulator part  59 B is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 B. 
     A magnetic material layer  51 C is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of a conductor pattern  52 B described later, and a second through-hole formed between the cutout and a portion close to the cutout at a position corresponding to a conductor pattern  52 C described later. In the cutout of the magnetic material layer  51 C, a conductor  54 C having the same thickness as the magnetic material layer  51 C is formed by printing using the same material as the conductor pattern  52 B. A conductor is also formed in the first through-hole in the same way. In the conductor pattern  52 B less than one turn is formed on the upper surface of the magnetic material layer  51 C and has one end connected to the other end of the conductor pattern  52 A via the conductor in the first through-hole formed in the magnetic material layer  51 C. In the second through-hole formed between the cutout and the portion close to the cutout at the position corresponding to the conductor pattern  52 C, an insulator part  59 C is formed having a thickness that is the sum of the thickness of the magnetic material layer  51 C and the thickness of the conductor pattern  52 B. The insulator part  59 C is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 C. 
     A magnetic material layer  51 D is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of the conductor pattern  52 C described later, and a second through-hole formed between the cutout and a portion of the conductor pattern  52 C described later close to the cutout. In the cutout of the magnetic material layer  51 D, a conductor  54 D having the same thickness as the magnetic material layer  51 D is formed by printing using the same material as the conductor pattern  52 C. A conductor is also formed in the first through-hole in the same way. In the conductor pattern  52 C less than one turn is formed on the upper surface of the magnetic material layer  51 D and has one end connected to the other end of the conductor pattern  52 B via the conductor in the first through-hole formed in the magnetic material layer  51 D. In the second through-hole formed between the cutout and the portion of the conductor pattern  52 C close to the cutout, an insulator part  59 D is formed having a thickness that is the sum of the thickness of the magnetic material layer  51 D and the thickness of the conductor pattern  52 C. The insulator part  59 D is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 D. 
     A magnetic material layer  51 E is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of a conductor pattern  52 D described later, and a second through-hole formed between the cutout and a portion close to the cutout at a position corresponding to the conductor pattern  52 C. In the cutout of the magnetic material layer  51 E, a conductor  54 E having the same thickness as the magnetic material layer  51 E is formed by printing using the same material as the conductor pattern  52 D. A conductor is also formed in the first through-hole in the same way. In the conductor pattern  52 D less than one turn is formed on the upper surface of the magnetic material layer  51 E and has one end connected to the other end of the conductor pattern  52 C via the conductor in the first through-hole formed in the magnetic material layer  51 E. In the second through-hole formed between the cutout and the portion close to the cutout at the position corresponding to the conductor pattern  52 C, an insulator part  59 E is formed having a thickness that is the sum of the thickness of the magnetic material layer  51 E and the thickness of the conductor pattern  52 D. The insulator part  59 E is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 E. 
     A magnetic material layer  51 F is formed into a rectangular sheet shape and has a cutout formed in one of the longitudinal-direction side surfaces, a first through-hole formed at a position corresponding to one end of a conductor pattern  52 E described later, and a second through-hole formed between the cutout and a portion close to the cutout at a position corresponding to the conductor pattern  52 C. In the cutout, a conductor  54 F having the same thickness as the magnetic material layer  51 F is formed by printing using the same material as the conductor pattern  52 E described later. A conductor is also formed in the first through-hole in the same way. In the conductor pattern  52 E less than one turn is formed on the upper surface of the magnetic material layer  51 F and has one end connected to the other end of the conductor pattern  52 D via the conductor in the first through-hole formed in the magnetic material layer  51 F and the other end led out to a side surface of the magnetic material layer  51 F perpendicular to the longitudinal direction and connected to the conductor  54 F. In the second through-hole formed between the cutout and the portion close to the cutout at the position corresponding to the conductor pattern  52 C, an insulator part  59 F is formed having the same thickness as the thickness of the magnetic material layer  51 F. The insulator part  59 F is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the magnetic material layer  51 F. 
     A magnetic material layer  51 G for protecting the conductor pattern is formed on the magnetic material layer  51 F having the conductor pattern  52 E formed thereon. 
     By spirally connecting the conductor patterns  52 A to  52 E between the magnetic material layers in this way, a coil pattern is formed in a laminated body. In this laminated body  50 , a portion of a surface of a conductor connected to the lead-out end (the first end portion) of the coil pattern is exposed on the bottom surface, and the second end portion of the coil pattern is exposed on the longitudinal-direction side surface of the laminated body  50  together with a portion of a surface of a conductor connected to the second end portion and embedded in the longitudinal-direction side surface. In this case, the conductor extends in the lamination direction of the magnetic material layers between the bottom surface of the laminated body  50  and the second end portion. This laminated body  50  has a pair of external terminals that is the first external terminal and the second external terminal, formed on the bottom surface, and the lead-out ends of the coil pattern are respectively connected via the conductors so that a coil is connected between the paired external terminals. Furthermore, the surface of the conductor embedded with the surface partially exposed on the longitudinal-direction side surface of the laminated body  50  is covered with an insulator film formed on the longitudinal-direction side surface of the laminated body  50 . The insulator film is made of an insulating material, for example, a dielectric material such as glass and glass ceramics, a magnetic material such as ferrite, or a nonmagnetic material, and is particularly made of a material higher in volume resistivity and withstand voltage than the material constituting the laminated body  50 . 
     In this laminated body  50 , an insulator part extending in the lamination direction of the magnetic material layers is formed between the conductor connected to the second end portion of the laminated body  50  and the coil pattern. 
     The laminated electronic component formed in this way has a core cross-sectional area of 0.37 mm 2 , an inductance of 0.105 μH, a DC resistance value (Rdc) of 23.1 mΩ, and a rated current (Isat) of 7.1 A as the current value at −30% inductance relative to the inductance without a load when DC superimposition characteristics of an inductor are measured. Since the conventional laminated electronic component shown in  FIGS. 6 and 7  has the values of 0.36 mm 2 , 0.105 μH, 22.8 mil, and 6.9 A, respectively, and the conventional laminated electronic component shown in  FIGS. 8 and 9  has the values of 0.35 mm 2 , 0.104 μH, 22.6 mil, and 6.6 A, respectively, the laminated electronic component of the present disclosure has excellent DC superimposition characteristics and high insulation and withstand voltage characteristics as compared to the conventional components. 
     The inductance and the DC superimposition characteristics were measured by using LCR Meter 4285A, and the DC resistance value was measured by using Milliohm Meter 4338B. 
     Although the embodiments of the laminated electronic component of the present disclosure have been described, the present disclosure is not limited to the embodiments. For example, in the embodiments, the external terminals are formed on the bottom surface of the laminated body such that the terminals are visible from the side surfaces; however, the external terminals may be formed on the bottom surface of the laminated body away from the sides adjacent to the side surfaces such that the terminals are invisible from the side surfaces. In the first embodiment, an insulator part may be disposed between the electrode formed on the side surface of the laminated body to which the second end portion of the coil is led out and the coil pattern. In the first embodiment, the second end portion of the coil pattern may further be connected via a conductor to the second external terminal formed on the bottom surface of the laminated body. 
     In the second and third embodiments, an electrode may further be formed on the longitudinal-direction side surface of the laminated body to which the second end portion of the coil is led out. 
     It is to be understood that although the present disclosure has been described with regard to preferred embodiments thereof, various other embodiments and variants may occur to those skilled in the art, which are within the scope and spirit of the disclosure, and such other embodiments and variants are intended to be covered by the following claims. 
     All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference.