| 摘要 |
PROBLEM TO BE SOLVED: To provide a humidity sensor capable of detecting the relative humidity with high reliability, even in an atmosphere where many miniscule molecules, such as tobacco molecules, float. SOLUTION: The humidity sensor 10 has a photocatalyst filter 40, which is obtained by spraying a photocatalyst comprising, for example, titanium oxide (TiO<SB>2</SB>) on a porous filter to coat the porous filter, provided to a case opening 11a so as to cover the case opening 11a. Furthermore, a case 11 housing a humidity detection element 20 is constituted so as to form a recess 12 to the peripheral edge of the case opening 11a, and the photocatalyst filter 40 has a frame member 41, having a protrusion 42 corresponding to the recess 12 of the case 11. The photocatalyst filter 40 is fixed to the case 11, by having the protrusion 42 of the frame member 41 press-fit engagingly in the recess 12 of the case 11. COPYRIGHT: (C)2008,JPO&INPIT
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