Patent ID: 8603398

Claim:
A fragrance delivery system, comprising: a control unit configured to control a release mechanism to release at least one selected fragrance, said control unit comprising a selection unit configured to select said selected fragrance from at least two fragrances and said control unit controlling said release mechanism to release said selected fragrance, and a switching element configured to switch said release mechanism between a first release state and a second release state or vice versa, wherein said release mechanism releases said selected fragrance from said fragrance delivery system to a space in said first release state and in said second release state, and wherein said release mechanism releases said selected fragrance at a higher rate in said first release state than in said second release state, and wherein said switching element is further configured to switch said release mechanism between said first release state and said release second state during a first period of time, and to switch said release mechanism between said first release state and said second release state during a second period of time, wherein said first period of time is longer in duration than said second period of time, a timer configured to measure a measured period of said first state in the range of from 100 to 200 seconds and a measured period of said second state is in the range of from 20 to 100 seconds, a memory element in which at least one desired value of a period of the first and/or second state may be stored, and a comparator configured to compare said measured period of said first and/or second state with said desired value and output a switching signal to said switching element, wherein said switching element is arranged to change said release mechanism between said first state and said second state in response to said switching signal.