| 摘要 |
The present application relates to the prevention of electrochemical corrosion at charging contacts, in particular at charging contacts of a battery-powered handpiece and its charger device of a dental curing light, especially in the presence of electrically conductive fluids, such as disinfectants. This object is achieved by providing a battery-powered handpiece comprising means for allowing charging current to flow but preventing current flow in the opposite direction, or comprising means for sensing current flow due to fluids present at the contacts, and/or by providing a charger comprising detection means for detecting the presence or absence of a handpiece together with switching means to respond to such detection means, or comprising means for sensing current flow due to fluids present at the contacts. <IMAGE> |
