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.   
     
     
       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  1  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 substantially 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 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;   a first outer terminal electrode and a second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and   a first extended conductor layer and a 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 a first exposed surface that extends in a substantially L-shaped form along a portion of the first end surface to a 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,   wherein a width of the first outer terminal electrode is wider than a width of the coil conductor,   wherein the second outer terminal electrode is so provided as to form a second exposed surface that extends in a substantially L-shaped form along a portion of the second end surface to a 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,   wherein the plurality of the loop conductor layers collectively includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along the first end surface and the second end surface, respectively; a first oblique side portion connecting a first end portion of the lower side portion to a first end portion of the first lateral side portion, the first oblique side portion oriented in a first oblique direction relative to the lower surface; and a second oblique side portion connecting a second end portion of the lower side portion to a first end portion of the second lateral side portion, the second oblique side portion oriented in a second oblique direction relative to the lower surface,   wherein the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and   wherein 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.    
     
     
       7. A lamination inductor comprising:
 a component main-body that is formed in a substantially 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 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;   a first outer terminal electrode and a second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and   a first extended conductor layer and a 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 a first exposed surface that extends in a substantially L-shaped form along a portion of the first end surface to a 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,   wherein the second outer terminal electrode is so provided as to form a second exposed surface that extends in a substantially L-shaped form along a portion of the second end surface to a 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,   wherein the plurality of the loop conductor layers collectively includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along the first end surface and the second end surface, respectively; a first oblique side portion connecting a first end portion of the lower side portion to a first end portion of the first lateral side portion, the first oblique side portion oriented in a first oblique direction relative to the lower surface; and a second oblique side portion connecting a second end portion of the lower side portion to a first end portion of the second lateral side portion, the second oblique side portion oriented in a second oblique direction relative to the lower surface,   wherein the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and   wherein 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.    
     
     
       8. The lamination inductor according to  claim 7 , wherein the length A1 and the length A2 are equal to each other.  
     
     
       9. A lamination inductor comprising:
 a component main-body that is formed in a substantially 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 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;   a first outer terminal electrode and a second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and   a first extended conductor layer and a 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 a first exposed surface that extends in a substantially L-shaped form along a portion of the first end surface to a 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,   wherein the second outer terminal electrode is so provided as to form a second exposed surface that extends in a substantially L-shaped form along a portion of the second end surface to a 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,   wherein the plurality of the loop conductor layers collectively includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along the first end surface and the second end surface, respectively; a first oblique side portion connecting a first end portion of the lower side portion to a first end portion of the first lateral side portion, the first oblique side portion oriented in a first oblique direction relative to the lower surface; and a second oblique side portion connecting a second end portion of the lower side portion to a first end portion of the second lateral side portion, the second oblique side portion oriented in a second oblique direction relative to the lower surface,   wherein the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and   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.    
     
     
       10. The lamination inductor according to  claim 9 , wherein the length B1 and the length B2 are equal to each other.  
     
     
       11. The lamination inductor according to  claim 9 , wherein the first outer electrode or the second outer electrode do not protrude out from the component main-body.  
     
     
       12. The lamination inductor according to  claim 9 , wherein the lower side portion linearly extends in parallel to the lower surface.  
     
     
       13. The lamination inductor according to  claim 9 , wherein the first lateral side portion or the second lateral side portion linearly extend in parallel to the first end surface.  
     
     
       14. The lamination inductor according to  claim 9 , wherein the plurality of the loop conductor layers collectively includes an upper side portion, and the upper side portion linearly extend in parallel to the upper surface.  
     
     
       15. The lamination inductor according to  claim 14 , wherein the upper side portion is connected to the first lateral side portion or the second lateral side portion at a right angle.  
     
     
       16. The lamination inductor according to  claim 9 , wherein the first oblique side portion or the second oblique side portion are linear.  
     
     
       17. The lamination inductor according to  claim 9 , wherein in a view normal to a plane containing one of the plurality of loop conductor layers:
 in a portion of the first outer terminal electrode that extends in a direction of the first end surface, a first location that is nearest the first oblique side portion defines a first point,   in a portion of the first outer terminal electrode that extends in a direction of the lower surface, a second location that is nearest the first oblique side portion defines a second point,   a first imaginary line contains the first point and the second point, and   the first imaginary line does not intersect the first oblique side portion.    
     
     
       18. The lamination inductor according to  claim 9 , wherein in a view normal to a plane containing one of the plurality of loop conductor layers:
 in a portion of the first exposed surface that extends in a direction of the first end surface, a first location that is farthest from the lower surface defines a first point,   in a portion of the first exposed surface that extends in a direction of the lower surface, a second location that is farthest from the first end surface defines a second point,   a first imaginary line contains the first point and the second point, and   the first imaginary line does not intersect the first oblique side portion.    
     
     
       19. The lamination inductor according to  claim 9 , wherein the first extended conductor layer has a width no larger than double a width of the loop conductor layer to which the first extended conductor layer connects.  
     
     
       20. The lamination inductor according to  claim 9 , further including a first plating film formed on the first exposed surface and a second plating film formed on the second exposed surface.  
     
     
       21. The lamination inductor according to  claim 9 , wherein a self-resonant frequency of the lamination inductor exceeds 1000 MHz.  
     
     
       22. A lamination inductor comprising:
 a component main-body that is formed in a substantially 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 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;   a first outer terminal electrode and a second outer terminal electrode that are electrically connected to one end and the other end of the coil conductor, respectively; and   a first extended conductor layer and a 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 a first exposed surface that extends in a substantially L-shaped form along a portion of the first end surface to a 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,   wherein the second outer terminal electrode is so provided as to form a second exposed surface that extends in a substantially L-shaped form along a portion of the second end surface to a 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,   wherein the plurality of the loop conductor layers collectively includes a lower side portion extending along the lower surface; a first lateral side portion and a second lateral side portion extending along the first end surface and the second end surface, respectively; a first oblique side portion connecting a first end portion of the lower side portion to a first end portion of the first lateral side portion, the first oblique side portion oriented in a first oblique direction relative to the lower surface; and a second oblique side portion connecting a second end portion of the lower side portion to a first end portion of the second lateral side portion, the second oblique side portion oriented in a second oblique direction relative to the lower surface,   wherein the lower side portion has a length shorter than the gap and is positioned within a range of the gap, and   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,   wherein one of the plurality of loop conductor layers extends more than one turn in a spiral form.