| 摘要 |
A switchable optical unit, capable of controlling a beam of radiation (b) passing through an optically active portion ( 8 ) of the unit, comprises a fluid chamber ( 10 ) including an electrically conductive liquid ( 18 ), which chamber comprises a pair of first electrodes ( 20,22 ) fixed to the chamber inner walls ( 12,14 ) at the position of the optically active portion and second electrode means ( 24 ) fixed to inner walls of the chamber outside the optically active portion and a third electrode ( 28 ) connected to the conductive liquid. By applying a voltage (V) to the first electrodes and the second electrode means, respectively the conductive liquid can be moved in and out the optically active portion so that the unit ( 1 ) is switched between a least two discrete states.
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