| 摘要 |
A humidity indicator includes a first film (F 1 ) covering a surface of a humidity-determining plate (B), and a second film (F 2 ) covering a back of the humidity-determining plate (B). A flat air layer (Au) is formed at least between the first film (F 1 ) and the surface of the humidity-determining plate (B), so that the entire surfaces of humidity-determining faces (M 1 to M 4 ), to which cobalt chloride (CO) is exposed, face to the air layer (Au), and a plurality of small holes (H) are formed at distances from one another in the first film (F 1 ) to permit the direct communication of the air layer (Au) with the atmosphere. Therefore, even if an operator picks, with his or her hand, a humidity indicator for determining humidity by the discoloration of cobalt chloride, the cobalt chloride on a humidity-determining face is prevented effectively from adhering to the operator's hand and thus, entering into his or her body. In addition, even if fine dust is generated from a base paper sheet of the humidity indicator, it is hard for the dust to be diffused to the surroundings, thereby effectively preventing the influence of the dust to electronic parts.
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