CERAMIC CAPACITOR AND ELECTRONIC COMPONENT INCLUDING THE SAME

• US 20100123995A1
• Filed: 11/13/2009
• Published: 05/20/2010
• Est. Priority Date: 11/17/2008
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: YOSHIDA, Kazuhiro, OTSUKA, Hideki
• Granted Patent: US 8,233,265 B2
• Time in Patent Office: Days
• US Class Current: 361/308.100
• CPC Class Codes: H01G 2/06 specially adapted for mounting on a printed-circuit support
• CPC Class Codes: H01G 4/228 Terminals
• CPC Class Codes: H01G 4/232 electrically connecting two or more layers of a stacked or rolled capacitor
• CPC Class Codes: H01G 4/30 Stacked capacitors H01G4/33 takes precedence
• CPC Class Codes: H05K 2201/10636 Leadless chip, e.g. chip capacitor or resistor
• CPC Class Codes: H05K 2201/10946 Leads attached onto leadless component after manufacturing the component
• CPC Class Codes: H05K 3/3426 characterised by the leads
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

In a ceramic capacitor, first and second electrode terminals each include a bonded-to-substrate portion, a first bonded-to-electrode portion bonded to a first edge of one of first and second external electrodes, a second bonded-to-electrode portion bonded to a second edge of the one of first and second external electrodes and disposed at a distance from the first bonded-to-electrode portion in the first directions, and a connecting portion connecting the first and second bonded-to-electrode portions and the bonded-to-substrate portion. W₁/W₀ is about 0.3 or more, and h/L is about 0.1 or more.

Claims

1. A ceramic capacitor for mounting on a substrate, the ceramic capacitor comprising:

a capacitor body substantially made of a dielectric material, the capacitor having a substantially rectangular parallelepiped shape and including first and second end surfaces, first and second side surfaces, and first and second main surfaces, the first and second end surfaces extending along vertical directions and first directions perpendicular or substantially perpendicular to the vertical directions, the first and second side surfaces extending along second directions and the vertical directions, the second directions being perpendicular or substantially perpendicular to the first directions and the vertical directions, the first and second main surfaces extending along the first directions and the second directions;

first and second internal electrodes disposed at an interval inside the capacitor body;

a first external electrode disposed on the first end surface and electrically connected to the first internal electrode;

a second external electrode disposed on the second end surface and electrically connected to the second internal electrode;

a first electrode terminal having a first edge bonded to the first external electrode and electrically connected to the first external electrode and having a second edge bonded to the substrate; and

a second electrode terminal having a first edge bonded to the second external electrode and electrically connected to the second external electrode and having a second edge bonded to the substrate;

wherein

the capacitor body is supported by the first and second electrode terminals at a distance from the substrate;

each of the first and second electrode terminals includes;

a bonded-to-substrate portion bonded to the substrate;

a first bonded-to-electrode portion bonded to an edge in one of the first directions, of one of the first and second external electrodes;

a second bonded-to-electrode portion bonded to an edge in the other of the first directions, of the one of the first and second external electrodes, the second bonded-to-electrode portion being disposed at a distance from the first bonded-to-electrode portion in the first directions; and

a connecting portion arranged to connect the first and second bonded-to-electrode portions and the bonded-to-substrate portion;

if a width along the first directions, of a portion of the ceramic capacitor except for the first and second electrode terminals is represented by W₀ and a distance along the first directions between the first and second bonded-to-electrode portions is represented by W₁, a ratio of W₁ to W₀ is about 0.3 or more, and

if a length along the second directions, of a portion of the ceramic capacitor except for the first and second electrode terminals is represented by L and a distance along the vertical directions between the capacitor body and the substrate is represented by h, a ratio of h to L is about 0.1 or more.

2. The ceramic capacitor according to claim 1, wherein the ratio of W₁ to W₀ is about 0.5 or less.

3. The ceramic capacitor according to claim 1, wherein the ratio of h to L is about 0.35 or less.

4. The ceramic capacitor according to claim 1, wherein the first internal electrode and the second internal electrode are opposed to each other in the vertical directions.

5. The ceramic capacitor according to claim 1, wherein the first and second bonded-to-electrode portions are each bonded to an upper portion and a lower portion of one of the first and second external electrodes rather than to a central portion in the vertical directions, of the one of the first and second external electrodes.

6. The ceramic capacitor according to claim 1, wherein a protrusion protruding toward one of the first and second external electrodes is provided on portions of the first and second bonded-to-electrode portions, the portions being each bonded to the one of the first and second external electrodes.

7. The ceramic capacitor according to claim 1, wherein a bend that is bent so as to protrude toward one or the other of the second directions is provided in the connecting portion.

8. The ceramic capacitor according to claim 1, wherein none of the first and second bonded-to-electrode portions is bonded to a central portion along the first directions, of one of the first and second external electrodes, and the smaller of a distance between a center in the first directions, of one of the first and second external electrodes and an edge in one of the first directions, of the one of the first and second external electrodes and a distance between the center and an edge in the other of the first directions, of the one of the first and second external electrodes is about 0.15 times or more W₀.

9. An electronic component comprising:

a substrate;

the ceramic capacitor according to claim 1 mounted on the substrate.