Filing Information

Inventor(s)	Hidenori Uchi · Masakazu Furukawa · Tadao Fujihira · Ichizo Tsukuda · Eizo Isoyama ·
Assignee(s)	KDK Corporation · Showa Aluminum Corporation ·  View assignee updates
Primary Examiner	Kristine Kincaid ·
Assistant Examiner	Eric W. Thomas ·
Application Number	US8995967
Filing date	12/22/1997
Issue date	03/14/2000
Predicted expiration date	12/22/2017
U.S. Classifications	361/509  · 361/500  ·
International Classifications	H01G 904  ·
Kind Code	A
International Classifications	361500;502;503;508;509;523;525;528;529;532 ·
Foreign Priority	JP8359898 - 12/25/1996 ·

Patent Family

Abstract

An aluminum electrode foil for an electrolytic capacitor has a sponge-like etching layer formed on at least one of the surfaces thereof, and the sponge-like etching layer is reduced in a direction of thickness. The aluminum density of the reduced sponge-like etching layer `d2` is set from 0.8 to 2.2 g/cm.sup.3.

Independent Claims | See all claims (23)

1. 1. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, and aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3.
2. 12. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is set at 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, and aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3.
3. 13. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and a ratio `d2/d1` of the aluminum density of said sponge-like etching layer after reduction `d2` to that of said layer before reduction `d1` is from 1.2 to 3.7.
4. 14. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and a ratio `d2/d1` of aluminum density of said sponge-like etching layer after reduction `d2` to that of said layer before reduction `d1` is from 1.2 to 3.7.
5. 15. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and annealing is carried out at a temperature from 200 to 500.degree. C. after reduction.
6. 16. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and annealing is carried out at a temperature from 200 to 500.degree. C. after reduction.
7. 17. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, a ratio `d2/d1` of aluminum density of said sponge-like etching layer after reduction `d2` to that of the layer before reduction `d1` is from 1.2 to 3.7, and annealing is carried out after reduction at a temperature from 200 to 500.degree. C.
8. 18. An aluminum electrode foil for an electrolytic capacitor characterized in that a sponge-like etching layer is formed on at least one surface of said foil, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, a ratio `d2/d1` of aluminum density of said sponge-like etching layer after reduction `d2` to that of said layer before reduction `d1` is from 1.2 to 3.7, and annealing is carried out at a temperature of 200 to 500.degree. C. after reduction.
9. 20. An electrolytic capacitor using an aluminum foil as an electrode material, wherein said aluminum foil has a sponge-like etching layer formed on at least one surface thereof, said sponge-like etching layer is reduced in the direction of thickness and aluminum density of said sponge-like etching layer after reduction `d2` is set form 0.8 to 2.2 g/cm.sup.3.
10. 21. An electrolytic capacitor using an aluminum roil as an electrode material, wherein said aluminum foil has a sponge-like etching layer formed on at least one surface thereof, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, and aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3.
11. 22. An electrolytic capacitor using an aluminum foil as an electrode material, wherein said aluminum foil has a sponge-like etching layer formed on at least one surface thereof, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and a ratio `d2/d1` of aluminum density of said sponge-like etching layer after reduction `d2` to that of said layer before reduction `d1` is from 1.2 to 3.7.
12. 23.23. An electrolytic capacitor using an aluminum foil as an electrode material, wherein said aluminum foil has a sponge-like etching layer formed on at least one surface thereof, said sponge-like etching layer is reduced in the direction of thickness, aluminum density of said sponge-like etching layer before reduction `d1` is 0.6 g/cm.sup.3 to 1.0 g/cm.sup.3, aluminum density of said sponge-like etching layer after reduction `d2` is set from 0.8 to 2.2 g/cm.sup.3, and a ratio `d2/d1` of aluminum density of said sponge-like etching layer after reduction `d2` to that of said layer before reduction `d1` is from 1.2 to 3.7.