Laminated inductor

Abstract

A laminated inductor includes a component body that provides a mounting surface on one of its faces, and at least a pair of external electrodes are formed on the mounting surface, wherein the component body has a laminate constituted by multiple insulator layers, a spiral coil conductor formed in the laminate, and leader parts that electrically connect the coil conductor and external electrodes; the coil conductor comprises conductor patterns formed in the insulator layers and via hole conductors that penetrate through the insulator layers and electrically connect the multiple conductor patterns, and also has a coil axis running roughly in parallel with the mounting surface and a turn unit having one or more sides running roughly in parallel with the mounting surface; and the via hole conductors are formed only on the side farthest away from the mounting surface among the one or more sides.

We claim: 
     
       1. A laminated inductor having a component body that provides a mounting surface on one face of the component body, and at least a pair of external electrodes formed on the mounting surface, wherein:
 the component body has a laminate constituted by multiple insulator layers, a spiral coil conductor formed in the laminate, and leader parts that electrically connect the coil conductor and the external electrodes, respectively; 
 the coil conductor comprises multiple conductor patterns formed in the insulator layers and via hole conductors that penetrate through the insulator layers and electrically connect the multiple conductor patterns in a direction parallel to the mounting surface, constituting turn units, wherein a coil axis runs roughly in parallel with the mounting surface and roughly perpendicularly to the turn units, said turn units having sides roughly in parallel with and perpendicular to the mounting surface, respectively; and 
 all of the via hole conductors are formed only on a side one of the sides of the turn units, which is farthest away from the mounting surface among the sides of the turn units, 
 wherein the conductor pattern comprises a combination of a C-shaped pattern constituted by a polygonal shape having three or more apexes and having a part of one side missing, and a bar-shaped pattern constituted by (i) a roughly straight line shape when the C-shaped pattern is a roughly polygonal pattern having three or more apexes and having a part of one side missing, or (ii) a curved line that constitutes a part of an elliptical shape when the bar-shaped pattern and the C-shaped pattern constitute the elliptical shape, the bar-shaped pattern is longer than a length of the missing part of the C-shaped pattern, and the bar-shaped pattern constitutes at least a part of the side farthest away from the mounting surface. 
 
     
     
       2. A laminated inductor according to  claim 1 , wherein the pair of external electrodes are formed on the mounting surface apart from each other via an insulation region, where at least some via hole conductors are formed such that their vertically projected shapes on the mounting surface are positioned within the insulation region. 
     
     
       3. A laminated inductor according to  claim 1 , wherein the pair of external electrodes are formed on the mounting surface and a maximum distance between two points of vertically projected shapes of all via hole conductors per turn unit on the mounting surface is shorter than an interval between the pair of external electrodes. 
     
     
       4. A laminated inductor according to  claim 1 , wherein the laminated inductor is constituted wherein a center axis of the coil conductor passes farther away from the mounting surface than a plane running in parallel with the mounting surface and passing a midpoint between the mounting surface and the farthest part of the component body from the mounting surface. 
     
     
       5. A laminated inductor according to  claim 1 , wherein the laminated inductor is constituted such that vertically projected shapes of the leader parts on the mounting surface are positioned on an outer side of a vertically projected shape of the coil conductor on the mounting surface. 
     
     
       6. A laminated inductor according to  claim 1 , wherein the external electrodes are formed on the mounting surface and also over a section of at least one face of the component body connecting the mounting surface. 
     
     
       7. A laminated inductor according to  claim 2 , wherein the external electrodes are formed on the mounting surface and also over a section of at least one face of the component body connecting the mounting surface. 
     
     
       8. A laminated inductor according to  claim 3 , wherein the external electrodes are formed on the mounting surface and also over a section of at least one face of the component body connecting the mounting surface. 
     
     
       9. A laminated inductor according to  claim 4 , wherein the external electrodes are formed on the mounting surface and also over a section of at least one face of the component body connecting the mounting surface. 
     
     
       10. A laminated inductor according to  claim 5 , wherein the external electrodes are formed on the mounting surface and also over a section of at least one face of the component body connecting the mounting surface.