Drop dispenser

Abstract

A liquid dispenser for dispensing drops including a housing, a liquid reservoir, a discharge opening through which liquid can be discharged from the liquid reservoir, and a drop formation surface surrounding the discharge opening, at which surface the liquid accumulates in order to be discharged from the drop formation surface as a drop. The drop formation surface has an outer limiting contour, the shape of which deviates from a circular shape. The dispenser is used to prevent contamination of the liquid to be dispensed.

1 . A liquid dispenser for dispensing drops comprising
 a housing,   a liquid reservoir,   a discharge opening through which liquid from the liquid reservoir can be discharged, and   a drop formation surface surrounding the discharge opening, where the liquid accumulates in order to be discharged as a drop from the drop formation surface,   
       wherein 
       the drop formation surface has an outer limiting contour, the shape of which deviates from a circular shape. 
     
     
         2 . The liquid dispenser according to  claim 1 ,
 wherein   the limiting contour of the drop formation surface is formed by a limiting edge having a curvature radius of less than 0.1 mm.   
     
     
         3 . The liquid dispenser according to  claim 1 ,
 wherein   the limiting contour of the drop formation surface is formed in that within the limiting contour,  the drop formation surface is formed more hydrophilic than the surrounding external faces of the housing outside of the limiting contour.   
     
     
         4 . The liquid dispenser according to  claim 1 ,
 wherein   the part of the limiting contour at maximum distance to a discharge axis defined by the discharge opening is more distant from the discharge axis at least by a factor 1.2 than the part of the limiting contour at minimum distance.   
     
     
         5 . The liquid dispenser according to  claim 1 ,
 wherein   all partial sections of the limiting contour are formed either straight or curved with outward convexity.   
     
     
         6 . The liquid dispenser according to  claim 1 ,
 wherein   at least partial sections of the limiting contour form notches, which are curved with inward concavity.   
     
     
         7 . The liquid dispenser according to  claim 6 ,
 wherein   a plurality of notches is provided.   
     
     
         8 . The liquid dispenser according to  claim 7 ,
 wherein
 the plurality of notches are distributed uniformly over the circumference of the drop formation surface and/or 
 at least three notches are provided. 
   
     
     
         9 . The liquid dispenser according to  claim 1 ,
 wherein   the drop formation surface is formed concavely or convexly.