| 摘要 |
An interchangeable vessel 2 containing a substance and constructed to be inserted into apparatus which uses the substance, comprises a tank 4 formed of acoustically conductive material and a piezo electric film element 12 affixed to the outer surface of the vessel and serving as a level sensor for the substance contained in the tank of the vessel. The piezo electric film element 12 includes electrical contacts 24,26 interconnected to active signal and ground electrodes 14-22 formed as part of the piezo electric film element, with contact pads 24,26 constructed so as to be electrically coupled with electronics contained within the apparatus for driving the piezo electric element, when the vessel is inserted into the apparatus.
|
