초록 ▼

It is a metal filter 1 including a fine filtering layer 3 and a supporting member 2 sintered to be porous and having a covering surface 4 to integrate the fine filtering layer 3 into a laminate to maintain its shape. The average pore diameter of the fine filtering layer 3 is set to be smaller than a

It is a metal filter 1 including a fine filtering layer 3 and a supporting member 2 sintered to be porous and having a covering surface 4 to integrate the fine filtering layer 3 into a laminate to maintain its shape. The average pore diameter of the fine filtering layer 3 is set to be smaller than an average pore diameter of the supporting member 2. The covering surface 4 is formed in an uneven shape so as to allow a filtering surface of the fine filtering layer 3 to be an undulating filtering surface 3A such that the area ratio S1/S0 of its real filtration area S1 to the standard filtration area S0 of the case where it is not formed in an uneven shape, is larger than or equal to 1.3. The average thickness of the fine filtering layer 3 at valley portions 6 of the uneven shape is set to be larger than the average thickness of the fine filtering layer 3 at the crest portions 5 of the uneven shape, and the undulating filtering surface 3A is formed in a smoothly curved surface shape.

대표청구항 ▼

1. A metal filter comprising:a fine filtering layer, said fine filtering layer having a thickness that cannot, by itself, maintain its shape against filtration pressure, and a supporting member sintered to be porous and having a covering surface which integrates with the fine filtering layer as a la

1. A metal filter comprising:a fine filtering layer, said fine filtering layer having a thickness that cannot, by itself, maintain its shape against filtration pressure, and a supporting member sintered to be porous and having a covering surface which integrates with the fine filtering layer as a laminate to maintain its shape, wherein an average pore diameter of pores of said fine filtering layer is set to be smaller than an average pore diameter of pores of said supporting member, and said covering surface of said supporting member is formed in an uneven shape having crest portions so as to allow a filtering surface of the fine filtering layer to be an undulating filtering surface such that an area ratio S1/S0, where S1 is the actual filtration area and S0 is the standard filtration area in the case where the supporting member is not formed in an uneven shape, is larger than or equal to 1.3, and wherein an average thickness of said fine filtering layer at valley portions between said crest portions is set to be larger than an average thickness of said fine filtering layer at the crest portions, and the filtering surface of said fine filtering layer is formed in a smoothly curved surface shape.