Patent ID: 8186790
Filing Date: 2012-05-29
Classification: B41J

Abstract:
1. A method for expelling a drop of a fluid from an orifice, comprising: providing a dispenser including a reservoir for a fluid, the reservoir having an internal volume that is electrically actuable between a smaller volume and a larger volume, the dispenser defining an orifice of a predetermined internal radius R, the orifice being provided the fluid from the reservoir; providing a fluid to the dispenser, the fluid and orifice being characterized with an Ohnesorge number less than about 0.1, the fluid having a density ρ and a surface tension σ; providing an electronic controller to actuate the reservoir with a control signal at a predetermined frequency, the value of the frequency satisfying the following relationships: actuating the reservoir with the control signal; and expelling a drop of the fluid from the orifice by said actuating.