LAMINATED CERAMIC CAPACITOR

Abstract

A laminated ceramic capacitor includes a body having an inner layer portion and an outer layer portion and a plurality of terminal electrodes spaced apart from each other in a length direction of the body. The inner layer portion has a plurality of internal electrodes stacked in a height direction of the body. The internal electrodes have led-out portions led out to a side face of the body. The outer layer portion is disposed on one of opposite faces of the inner layer portion in the height direction. Each terminal electrode extends along the height direction to cover corresponding one of the led-out portions and is provided with an intermediate portion and an end portion. The intermediate portion has a larger electrode width than the led-out portion. The end portion has a smaller electrode width at an edge of the side face than the intermediate portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a laminated ceramic capacitor according to one embodiment of the present invention;

FIG. 2 is a side view of the laminated ceramic capacitor shown in FIG. 1;

FIG. 3 is a plan view of the laminated ceramic capacitor shown in FIG. 1;

FIG. 4 is an exploded perspective view showing a layered structure of an inner layer portion of the laminated ceramic capacitor shown in FIGS. 1 to 3;

FIG. 5 is a side view, with parts omitted, showing an electronic device with a laminated ceramic capacitor according to one embodiment of the present invention;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 5;

FIG. 7 is a diagram showing experimental data on the electronic device shown in FIGS. 5 and 6;

FIG. 8 is a perspective view of a laminated ceramic capacitor according to another embodiment of the present invention;

FIG. 9 is a side view of the laminated ceramic capacitor shown in FIG. 8;

FIG. 10 is a plan view of the laminated ceramic capacitor shown in FIG. 8;

FIG. 11 is a perspective view of a laminated ceramic capacitor according to still another embodiment of the present invention;

FIG. 12 is a side view of the laminated ceramic capacitor shown in FIG. 11;

FIG. 13 is a plan view of the laminated ceramic capacitor shown in FIG. 11; and

FIG. 14 is an exploded perspective view showing a layered structure of an inner layer portion of the laminated ceramic capacitor shown in FIG. 11.

Claims

1. A laminated ceramic capacitor comprising a body and a plurality of terminal electrodes, wherein said body has an inner layer portion and an outer layer portion,said inner layer portion has a plurality of internal electrodes stacked in a height direction of said body,said internal electrodes have led-out portions led out to a side face of said body,said outer layer portion is disposed on at least one of opposite faces of said inner layer portion in said height direction,said terminal electrodes are spaced apart from each other in a length direction of said body perpendicular to said height direction and each extend along said height direction to cover corresponding one of said led-out portions,at least outermost ones of said terminal electrodes in said length direction are each provided with an intermediate portion and an end portion,said intermediate portion has a larger electrode width than said led-out portion, andsaid end portion has a smaller electrode width at an edge of said side face than said intermediate portion.

2. The laminated ceramic capacitor of claim 1, wherein said end portion has an electrode width equal to or larger than an electrode width of said led-out portion.

3. The laminated ceramic capacitor of claim 1, wherein said outermost terminal electrode has a tapered-shape whose electrode width gradually decreases from said intermediate portion toward said end portion.

4. The laminated ceramic capacitor of claim 2, wherein said outermost terminal electrode has a tapered-shape whose electrode width gradually decreases from said intermediate portion toward said end portion.

5. The laminated ceramic capacitor of claim 1, wherein all said terminal electrodes are each provided with said intermediate portion and said end portion.

6. The laminated ceramic capacitor of claim 2, wherein all said terminal electrodes are each provided with said intermediate portion and said end portion.

7. The laminated ceramic capacitor of claim 1, which satisfies: 1.10≦D21/D22≦1.50,where D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

8. The laminated ceramic capacitor of claim 2, which satisfies: 1.10≦D21/D22≦1.50,where D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

9. The laminated ceramic capacitor of claim 1, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

10. The laminated ceramic capacitor of claim 2, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

11. The laminated ceramic capacitor of claim 3, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

12. The laminated ceramic capacitor of claim 4, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

13. The laminated ceramic capacitor of claim 7, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

14. The laminated ceramic capacitor of claim 8, wherein said outermost terminal electrode is further provided with a grounding portion disposed on one face of said body and electrically connected to said end portion at said edge of said side face.

15. The laminated ceramic capacitor of claim 9, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion, andwhere in D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

16. The laminated ceramic capacitor of claim 10, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion, andwhere in D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

17. The laminated ceramic capacitor of claim 11, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion, andwhere in D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

18. The laminated ceramic capacitor of claim 12, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion, andwhere in D21 represents a maximum electrode width of said intermediate portion, and D22 represents an electrode width of said end portion.

19. The laminated ceramic capacitor of claim 13, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion.

20. The laminated ceramic capacitor of claim 14, which satisfies: D22<D23<D21,where D23 represents a maximum electrode width of said grounding portion.