Lamination inductor

Abstract

Outer terminal electrodes form exposed surfaces that extend in the form of a substantially L shape while at least part thereof are embedded in a component main-body. A loop conductor layer of the coil conductor has a lower side portion, lateral side portions, oblique side portions, and an upper side portion. The lower side portion has a length shorter than a gap between outer terminal electrodes, and is positioned within a range of the gap.

What is claimed is: 
     
       1. A lamination inductor comprising:
 a component main-body that is formed in a rectangular parallelepiped shape including an upper surface and a lower surface opposing each other, first and second side surfaces opposing each other and connecting the upper surface and the lower surface, and first and second end surfaces opposing each other and also connecting the upper surface and the lower surface, and that has a lamination structure in which a plurality of insulator layers are laminated in a direction perpendicular to the side surfaces; 
 a coil conductor that is disposed inside the component main-body, is constituted of a plurality of loop conductor layers each extending so as to form part of a circular path along an interface between the insulator layers and a plurality of via hole conductors passing through the insulator layers in a thickness direction of the insulator layers, and has a shape that is helically extended by alternately connecting the loop conductor layers and the via hole conductors; 
 first outer terminal electrode and second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and 
 first extended conductor layer and second extended conductor layer that are formed along an interface between the insulator layers, and connect the one end and the other end of the coil conductor with the first outer terminal electrode and second outer terminal electrode, respectively, 
 wherein the first outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the first end surface to a midway portion of the lower surface in a state where at least part of the first outer terminal electrode is embedded in the component main-body, 
 the second outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the second end surface to a midway portion of the lower surface while leaving a gap from the first outer terminal electrode on the lower surface in a state where at least part of the second outer terminal electrode is embedded in the component main-body, 
 the loop conductor layer includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along an upper half portion of the first end surface and an upper half portion of the second end surface, respectively; a first oblique side portion connecting an end portion of the lower side portion on the first end surface side and a lower end portion of the first lateral side portion in an oblique direction relative to the lower surface; and a second oblique side portion connecting an end portion of the lower side portion on the second end surface side and a lower end portion of the second lateral side portion in an oblique direction relative to the lower surface, 
 the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and 
 inner edges of the first and second lateral side portions do not overlap with the first and second outer terminal electrodes in a direction along the first and second end surfaces when viewed in a direction perpendicular to the first and second end surfaces and parallel to the first and second side surfaces, 
 wherein both a length B1 of a perpendicular line drawn from a first nearest portion, that is the nearest portion to the first oblique side portion in an extending section along the lower surface of the first outer terminal electrode, to the outer edge of the first oblique side portion and a length B2 of a perpendicular line drawn from a second nearest portion, that is the nearest portion to the second oblique side portion in an extending section along the lower surface of the second outer terminal electrode, to the outer edge of the second oblique side portion are no less than 10 μm and no more than 50 μm. 
 
     
     
       2. A lamination inductor comprising:
 a component main-body that is formed in a rectangular parallelepiped shape including an upper surface and a lower surface opposing each other, first and second side surfaces opposing each other and connecting the upper surface and the lower surface, and first and second end surfaces opposing each other and also connecting the upper surface and the lower surface, and that has a lamination structure in which a plurality of insulator layers are laminated in a direction perpendicular to the side surfaces; 
 a coil conductor that is disposed inside the component main-body, is constituted of a plurality of loop conductor layers each extending so as to form part of a circular path along an interface between the insulator layers and a plurality of via hole conductors passing through the insulator layers in a thickness direction of the insulator layers, and has a shape that is helically extended by alternately connecting the loop conductor layers and the via hole conductors; 
 first outer terminal electrode and second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and 
 first extended conductor layer and second extended conductor layer that are formed along an interface between the insulator layers, and connect the one end and the other end of the coil conductor with the first outer terminal electrode and second outer terminal electrode, respectively, 
 wherein the first outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the first end surface to a midway portion of the lower surface in a state where at least part of the first outer terminal electrode is embedded in the component main-body, 
 the second outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the second end surface to a midway portion of the lower surface while leaving a gap from the first outer terminal electrode on the lower surface in a state where at least part of the second outer terminal electrode is embedded in the component main-body, 
 the loop conductor layer includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along an upper half portion of the first end surface and an upper half portion of the second end surface, respectively; a first oblique side portion connecting an end portion of the lower side portion on the first end surface side and a lower end portion of the first lateral side portion in an oblique direction relative to the lower surface; and a second oblique side portion connecting an end portion of the lower side portion on the second end surface side and a lower end portion of the second lateral side portion in an oblique direction relative to the lower surface, and 
 the lower side portion has a length shorter than the gap and is positioned within a range of the gap, 
 wherein both a length A l of a perpendicular line drawn from an L-shaped internal corner portion of the first outer terminal electrode to an outer edge of the first oblique side portion and a length A 2  of a perpendicular line drawn from an L-shaped internal corner portion of the second outer terminal electrode to an outer edge of the second oblique side portion, are equal to or larger than 80 μm. 
 
     
     
       3. The lamination inductor according to  claim 2 ,
 wherein the length A 1  and the length A 2  are equal to each other. 
 
     
     
       4. A lamination inductor comprising:
 a component main-body that is formed in a rectangular parallelepiped shape including an upper surface and a lower surface opposing each other, first and second side surfaces opposing each other and connecting the upper surface and the lower surface, and first and second end surfaces opposing each other and also connecting the upper surface and the lower surface, and that has a lamination structure in which a plurality of insulator layers are laminated in a direction perpendicular to the side surfaces; 
 a coil conductor that is disposed inside the component main-body, is constituted of a plurality of loop conductor layers each extending so as to form part of a circular path along an interface between the insulator layers and a plurality of via hole conductors passing through the insulator layers in a thickness direction of the insulator layers, and has a shape that is helically extended by alternately connecting the loop conductor layers and the via hole conductors; 
 first outer terminal electrode and second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and 
 first extended conductor layer and second extended conductor layer that are formed along an interface between the insulator layers, and connect the one end and the other end of the coil conductor with the first outer terminal electrode and second outer terminal electrode, respectively, 
 wherein the first outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the first end surface to a midway portion of the lower surface in a state where at least part of the first outer terminal electrode is embedded in the component main-body, 
 the second outer terminal electrode is so provided as to form an exposed surface that extends in an L shape form from a lower half portion of the second end surface to a midway portion of the lower surface while leaving a gap from the first outer terminal electrode on the lower surface in a state where at least part of the second outer terminal electrode is embedded in the component main-body, 
 the loop conductor layer includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along an upper half portion of the first end surface and an upper half portion of the second end surface, respectively; a first oblique side portion connecting an end portion of the lower side portion on the first end surface side and a lower end portion of the first lateral side portion in an oblique direction relative to the lower surface; and a second oblique side portion connecting an end portion of the lower side portion on the second end surface side and a lower end portion of the second lateral side portion in an oblique direction relative to the lower surface, and 
 the lower side portion has a length shorter than the gap and is positioned within a range of the gap, 
 wherein both a length B 1  of a perpendicular line drawn from a first nearest portion, that is the nearest portion to the first oblique side portion in an extending section along the lower surface of the first outer terminal electrode, to the outer edge of the first oblique side portion and a length B 2  of a perpendicular line drawn from a second nearest portion, that is the nearest portion to the second oblique side portion in an extending section along the lower surface of the second outer terminal electrode, to the outer edge of the second oblique side portion are no less than 10 μm and no more than 50 μm. 
 
     
     
       5. The lamination inductor according to  claim 4 ,
 wherein the length B 1  and the length B 2  are equal to each other. 
 
     
     
       6. A lamination inductor comprising:
 a component main-body that is formed in a rectangular parallelepiped shape including an upper surface and a lower surface opposing each other, first and second side surfaces opposing each other and connecting the upper surface and the lower surface, and first and second end surfaces opposing each other and also connecting the upper surface and the lower surface, and that has a lamination structure in which a plurality of insulator layers are laminated in a direction perpendicular to the side surfaces;   a coil conductor that is disposed inside the component main-body, is constituted of a plurality of loop conductor layers each extending so as to form part of a circular path along an interface between the insulator layers and a plurality of via hole conductors passing through the insulator layers in a thickness direction of the insulator layers, and has a shape that is helically extended by alternately connecting the loop conductor layers and the via hole conductors;   first outer terminal electrode and second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and   first extended conductor layer and second extended conductor layer that are formed along an interface between the insulator layers, and connect the one end and the other end of the coil conductor with the first outer terminal electrode and second outer terminal electrode, respectively,   wherein:   the first outer terminal electrode is so provided as to form an exposed surface that extends in a substantially L shape form from a lower half portion of the first end surface to a midway portion of the lower surface in a state where at least part of the first outer terminal electrode is embedded in the component main-body,   the second outer terminal electrode is so provided as to form an exposed surface that extends in a substantially L shape form from a lower half portion of the second end surface to a midway portion of the lower surface while leaving a gap from the first outer terminal electrode on the lower surface in a state where at least part of the second outer terminal electrode is embedded in the component main-body,   the loop conductor layer includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along an upper half portion of the first end surface and an upper half portion of the second end surface, respectively; a first oblique side portion connecting an end portion of the lower side portion on the first end surface side and a lower end portion of the first lateral side portion in an oblique direction relative to the lower surface; and a second oblique side portion connecting an end portion of the lower side portion on the second end surface side and a lower end portion of the second lateral side portion in an oblique direction relative to the lower surface,   the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and   both a length A1 of a perpendicular line drawn from a substantially L-shaped internal corner portion of the first outer terminal electrode to an outer edge of the first oblique side portion and a length A2 of a perpendicular line drawn from a substantially L-shaped internal corner portion of the second outer terminal electrode to an outer edge of the second oblique side portion, are equal to or larger than 80 μm.   
     
     
       7. The lamination inductor according to  claim 6 , wherein the length A1 and the length A2 are equal to each other. 
     
     
       8. The lamination inductor according to  claim 6 , wherein the length A1 and the length A2 are equal to 81.6 μm. 
     
     
       9. The lamination inductor according to  claim 6 , wherein the length A1 and the length A2 are between 81.6 μm and 155.2 μm. 
     
     
       10. The lamination inductor according to  claim 6 , wherein a first end of the coil conductor is connected to an uppermost edge of the first outer terminal electrode. 
     
     
       11. The lamination inductor according to  claim 10 , wherein a second end of the coil conductor is connected to an uppermost edge of the second outer terminal electrode. 
     
     
       12. The lamination inductor according to  claim 1 , wherein a first end of the coil conductor is connected to an uppermost edge of the first outer terminal electrode. 
     
     
       13. The lamination inductor according to  claim 12 , wherein a second end of the coil conductor is connected to an uppermost edge of the second outer terminal electrode.