# US 8,274,778 B2 · Capacitor

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- Number: US 8,274,778 B2
- Document ID: US8274778B2
- Status: Granted
- Kind: B2
- Application number: 12/740,842
- Filed: 2008-10-17
- Published: 2010-11-25
- Granted: 2012-09-25
- Earliest claimed: 2008-01-17
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Fumitaka Yoshinaga; Naoyoshi Takamatsu
- Web page: https://patentgrep.com/patent/US8274778B2

## CPC

- H01G 4/32: Wound capacitors
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

A capacitor formed by winding a multilayer film in which an insulation film, a cathode, electrode, an insulation film and an anode electrode are serially multilayered, wherein at least one of first insulation film and second insulation film is formed so that an end portion of insulation film on an inward side of the capacitor has a thickness larger than a thickness of an end portion thereof on an outward side of the capacitor.

## Claims

### Claim 1

A capacitor formed by winding a multilayer film in which a first insulation film, a first electrode, a second insulation film and a second electrode are serially multilayered, wherein
at least one of said first insulation film and said second insulation film is formed so that an end portion thereof on an inward side of said capacitor has a thickness larger than a thickness of an end portion thereof on an outward side of said capacitor, and
said first electrode and said second electrode are formed as far as said inward-side end portion formed to be thicker.

### Claim 2 (depends on 1)

The capacitor according to claim 1, wherein
a material having a dielectric constant higher than dielectric constants of said first and second insulation films is added to the end portion of said first insulation film on the outward side of said capacitor and the end portion of the said second insulation film on the outward side of said capacitor.

### Claim 3

A capacitor formed by winding a multilayer film in which a first insulation film, a first electrode, a second insulation film and a second electrode are serially multilayered, wherein
at least one of said first insulation film and said second insulation film is formed so that an end portion thereof on an inward side of said capacitor has a thickness larger than a thickness of an end portion thereof on an outward side of said capacitor,
said first insulation film is formed so that an end portion thereof on the inward side of said capacitor has a thickness larger than a thickness of an end portion thereof on the outward side of said capacitor, and
said second insulation film is formed so that an end portion thereof on the inward side of said capacitor has a thickness larger than a thickness of an end portion thereof on the outward side of said capacitor.

### Claim 4 (depends on 3)

The capacitor according to claim 3, wherein
said first insulation film is formed so as to have a thickness progressively larger from the end portion of said first insulation film on the outward side of said capacitor toward the end portion thereof on the inward side of said capacitor, and
said second insulation film is formed so as to have a thickness progressively larger from the end portion of said second insulation film on the outward side of said capacitor toward the end portion thereof on the inward side of said capacitor.

### Claim 5 (depends on 4)

The capacitor according to claim 4, wherein
said first insulation film includes a first split insulation film disposed on the outward side of said capacitor, and a second split insulation film disposed more inward in said capacitor than said first split insulation film and formed to be thicker than said first split insulation film, and
said second insulation film includes a third split insulation film disposed on the outward side of said capacitor, and a fourth split insulation film disposed more inward in said capacitor than said third split insulation film and formed to be thicker than said third split insulation film.

### Claim 6 (depends on 5)

The capacitor according to claim 5, wherein
said first electrode includes a first split electrode formed on said first split insulation film, an end portion of said first split electrode on the inward side of said capacitor being disposed more outward in said capacitor than an end portion of said first split insulation film on the inward side of said capacitor, and
a second split electrode formed on said second split insulation film, an end portion of said second split electrode on the outward side of said capacitor being disposed more inward in said capacitor than an end portion of said second split insulation film on the outward side of said capacitor, and
said second electrode includes a third split electrode formed on said third split insulation film, an end portion of said third split electrode on the inward side of said capacitor being disposed more outward in said capacitor than an end portion of said third split insulation film on the inward side of said capacitor, and a fourth split electrode formed on said fourth split insulation film, an end portion of said fourth split electrode on the outward side of said capacitor being disposed more inward in said capacitor than an end portion of said fourth split insulation film on the outward side of said capacitor.