| 摘要 |
A device for diffusion of an active volatile substance into ambient air or closed spaces comprising a solid casing or housing and a solid carrier containing said volatile substance. The solid carrier is arranged in at least one recess formed in the housing, said recess having a depth and a width which are chosen in relation to the composition of the solid carrier so that the ratio of the evaporation surface of the solid carrier to the mass of the solid carrier is such that a substantially constant vapor release rate and total evaporation of said active volatile substance during the active lifetime of the device is obtained. The recesses can be of various geometrical shapes in order to give a pleasant appearance. The active volatile substance can be a perfuming, deodorizing, sanitizing composition or an insect repellent.</PTEXT>
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