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1. US20090021892 - Aluminum plate for aluminum electrolytic capacitor electrode, aluminum electrolytic capacitor, and method for manufacturing aluminum electrolytic capacitor

Office United States of America
Application Number 11816979
Application Date 13.03.2006
Publication Number 20090021892
Publication Date 22.01.2009
Grant Number 7612986
Grant Date 03.11.2009
Publication Kind B2
IPC
H01G 9/00
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
9Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
CPC
C25D 11/04
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
11Electrolytic coating by surface reaction, i.e. forming conversion layers
02Anodisation
04of aluminium or alloys based thereon
C25F 3/04
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
3Electrolytic etching or polishing
02Etching
04of light metals
H01G 9/045
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
9Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
004Details
04Electrodes ; or formation of dielectric layers thereon
042characterised by the material
045based on aluminium
H01G 9/055
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
9Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
004Details
04Electrodes ; or formation of dielectric layers thereon
048characterised by their structure
055Etched foil electrodes
Applicants Nippon Light Metal Company, Ltd.
Inventors Katano Masahiko
Isobe Masashi
Arai Shinichi
Agents Buchanan Ingersoll &; Rooney PC
Priority Data 2005084108 23.03.2005 JP
Title
(EN) Aluminum plate for aluminum electrolytic capacitor electrode, aluminum electrolytic capacitor, and method for manufacturing aluminum electrolytic capacitor
Abstract
(EN)

An aluminum plate having an aluminum purity of not less than 99.98% by mass and an Fe content of 5 to 50 ppm with the balance consisting of unavoidable impurities is used to realize increased capacitance of an aluminum electrolytic capacitor, reduced height, and improved high frequency characteristics. In this aluminum plate, the total content of Fe in crystal/precipitate is 1 to 50% based on the original content, and the thickness of the aluminum plate 0.2 to 1 mm. In the formation of a capacitor anode, the aluminum plate is subjected to alternate current etching so as to leave a core part having an average thickness of 50 to 150 μm in the center part in the thickness-wise direction to increase the surface area, followed by anodic oxidation.