| US 7,601,295 B2 | ||
| Filter, liquid discharge head utilizing the same, and producing method therefor | ||
| Yoshiaki Tomari, Yokohama (Japan); Katsunori Heishi, Fukushima (Japan); and Setsuo Fukuda, Ushiku (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jan. 17, 2006, as Appl. No. 11/275,587. | ||
| Claims priority of application No. 2005-012758 (JP), filed on Jan. 20, 2005. | ||
| Prior Publication US 2006/0157541 A1, Jul. 20, 2006 | ||
| Int. Cl. B22F 3/11 (2006.01) | ||
| U.S. Cl. 419—2 [228/190; 228/193; 228/199; 228/201; 228/202; 428/292.1; 428/304.4] | 13 Claims |
| 1. A method for producing a filter comprising a sintered sheet of a non-woven cloth of a metal fiber to be installed in a
liquid passage, the method comprising steps of:
preparing the sintered sheet with a web-shaped laminated structure, the sintered sheet comprising a first non-woven layer
constituted of a first metal fiber with a predetermined average wire diameter inside the sintered sheet and second non-woven
layers constituted of a second metal fiber with an average wire diameter greater than the predetermined average wire diameter
and forming both surfaces of the sintered sheet, wherein the first non-woven layer and the second non-woven layer are directly
bonded with each other;
rolling the sintered sheet after preparing the sintered sheet; and
electrolytic polishing the sintered sheet after said rolling step, with the sintered sheet serving as an anode, by arranging
two electrodes serving as a cathode at positions opposed to the second non-woven layers so that an etching rate of the first
metal fiber is less than that of the second metal fiber.
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