| 摘要 |
A cylindrical filter having an enlarged filtering space is provided to miniaturize the product relating to the unit amount and to increase the filtering efficiency. The filter body is curved with many times so that the plural crests are formed. In the filter body(10), the crests(12) with the short length as compared with the basic length are formed between the other crests(11). The two or more crests are also formed between the other crests. That is, in plural crests, the crests with long and short length are alternately formed. The length of the crest with the short length is nearly 1/2 in comparison with that of the other crest with the long length.
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