| 摘要 |
PROBLEM TO BE SOLVED: To provide a breather filter having a structure, wherein a high-function breather filter is made thin by a high mass-production method. SOLUTION: This filter 1 is fixed in a hole 3 provided in the cover 2 of a hard disk drive(HDD). This filter 1 is constructed in such a manner that a first sheet 11 having a diffusion tube 12 formed in a position corresponding to the hole 3 provided in the cover 2 of the HDD, a second sheet 21 having an opening part 22 formed in a position corresponding to the diffusion tube 12 of the first sheet 11, a third sheet 31 having an adsorbing material layer 32 in a position corresponding to the opening part 22 of the second sheet 21, and a fourth sheet 41 composed of a filter layer for covering the adsorbing material layer 32 of the third sheet 31 are respectively prepared, and the prepared first to fourth sheets are laminated.
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