| 摘要 |
An aroma-generating unit adapted to periodically discharge into the atmosphere bursts of aromatic vapor, the non-aromatic intervals between the bursts having a duration sufficient to avoid desensitizing the olfactory response of those exposed to the unit. The unit includes a hollow case whose upper wall has a vent therein and whose side wall has a slot to receive a replaceable cartridge provided with a porous mat impregnated with an aromatic liquid. When fully inserted, the cartridge is disposed below the vent and serves to define an air-confined chamber within the case. Disposed in this chamber is an electrical heater that is periodically energized by power pulses to heat and expand the confined air and to produce a positive pressure in the chamber forcing the heated air through the impregnated mat to rapidly volatilize the liquid and to produce bursts of aroma which are discharged into the atmosphere through the vent, which bursts are separated by relatively long, non-aromatic intervals. |
