Electrical components such as capacitors having electrodes with an insulating edge

• US 5,548,474 A
• Filed: 03/01/1994
• Issued: 08/20/1996
• Est. Priority Date: 03/01/1994
• Status: Expired due to Fees

• Current Assignee: AVX Corporation (Kyocera Corporation)
• Original Assignee: AVX Corporation (Kyocera Corporation)
• Inventors: Chen, Chorng-Jeou, Ladew, Richard, Mevissen, Jeffrey, Qiu, Yong-Jian
• Primary Examiner(s): Ledynh, Bot L.
• Application Number:
  US08/204,003
• Time in Patent Office: 903 Days
• Field of Search: 361/303-305, 361/311-313, 361/321.1, 361/321.2, 361/321.3, 361/321.4, 361/321.5, 29/25.42
• US Class Current: 361/313
• CPC Class Codes: H01G 4/30 Stacked capacitors H01G4/33 takes precedence

Abstract

A marginless electrical component, such as a capacitor, is fabricated by providing a multilayer body of electrodes and dielectric with an insulating layer on alternate electrodes on each terminated surface.

Claims

1. An electronic device having opposite facing top and bottom surfaces, opposite facing front and back surfaces, and opposite facing first and second side surfaces, comprising:

a marginless multilayer structure of electrode and dielectric layers, each layer having opposite facing top and bottom surfaces, opposite facing front and back edges, and opposite facing first and second sides, and

each electrode layer having an insulative coating on one of its front and back edges and being free of the insulative coating on the other of its front and back edges;

wherein alternate electrode layers have the insulating coating on the same edge.

2. A device as defined in claim 1, wherein, the insulative coating is anodized electrode material.

3. A device as defined in claim 2, wherein at least one of the top, first side, and second side surfaces of the electronic device is coated with a passivating layer.

4. A device as defined in claim 1, further comprising:

a first termination on the front surface of the device, the first termination electrically contacting the front edge of alternate electrodes, wherein the front edge of the alternate electrodes is free of the insulative coating;

a second termination on the back surface of the device, the second termination electrically contacting the back edge of alternate electrodes free of the insulative coating, wherein the back edge of the alternate electrodes is free of the insulative coating.

5. A device as defined in claim 1, wherein the device is a thin film capacitor comprising a substrate material disposed below the layers of electrode and dielectric.

6. A device as defined in claim 1, wherein the device is an electronic component selected from the group of a thin film capacitor, thick film capacitor, actuator, varistor, and a sensor.

10. A device as in claim 1, wherein the first and second edges of each dielectric layer are free of the insulative coating on the electrode layers.

7. A electronic device having a multilayer structure and including opposing top and bottom surfaces, opposing front and back surfaces, and opposing first and second side surfaces, comprising:

non-metal layers,

metal electrode layers, wherein each electrode layer has edges located at the front and back surfaces;

a marginless structure wherein the non-metal layers and electrode layers have substantially the same top and bottom surface area;

an oxide coating on one of the front and back edges of each electrode layer, with alternate electrode layers having the oxide coating on the same edge;

a first termination which electrically connects alternate electrode layers on the front surface of the device; and

a second termination which electrically connects alternate electrode layers on the back surface of the device.

8. A device as defined in claim 7, wherein the insulating coating is anodized electrode metal.

9. An electronic device as defined in claim 8, wherein the device is an electronic component selected from one of the group of a thin film capacitor, thick film capacitor, actuator, varistor, and a sensor.

11. A device as defined in claim 7, wherein a polymer passivation layer is deposited onto at least one of the top, first side, and second side surfaces of the electronic device.

12. A device as defined in claim 7, wherein the device is a thin film capacitor comprising a substrate material, the substrate material supporting the layers of electrode and dielectric.

13. A device as defined in claim 7, wherein the device is an electronic component selected from the group of a thin film capacitor, thick film capacitor, actuator, varistor, and a sensor.

14. A multilayer electrical device having adjacent electrode and non-electrode layers, the electrode layers having opposing first and second edges, the device comprising:

a set of first alternate electrode layers;

a set of second alternate electrode layers;

each first alternate electrode layer including an anodization coating on the first edge of the layer and an absence of anodization coating on the opposing second edge of the layer;

each second alternate electrode layer including an anodization coating on the second edge of the layer and an absence of anodization coating on the opposing first edge of the layer;

a first termination electrically connecting the first set of alternate electrode layers, the first termination contacting the first set of alternate electrode layers on the second edge of each layer; and

a second termination connecting the second set of alternate electrode layers, the second termination contacting the second set of alternate electrode layers on the first edge of each layer.

15. A device as in claim 14, further comprising a substrate material supporting the electrode and non-electrode layers.

16. A device as in claim 14, wherein the electrode layers and non-electrode layers are sized to create a marginless device.

17. A device according to claim 14, the device including opposing top and bottom surfaces, opposing front and back surfaces, and opposing side surfaces;

and

a passivation coating disposed on at least one surface of the device.

18. A device as defined in claim 14, wherein the device is an electronic component selected from the group of a thin film capacitor, thick film capacitor, actuator, varistor, and a sensor.

19. A multilayer capacitor having alternating layers of electrodes and dielectric material, the capacitor defining opposite facing first and second surfaces, the capacitor including terminations disposed on the first and second surfaces, the capacitor comprising:

anodizable electrodes extending from the first surface to the second surface of the capacitor; and

each electrode including an anodized portion on one of the first and second surfaces, the anodized portion insulating the electrode from the adjacent termination.