Patent ID: 8814330
Filing Date: 2014-08-26
Classification: B41J

Abstract:
1. A directivity detection device for detection of trajectories of drops issuing from a liquid jet, the drops being charged electrically, the device comprising: an electrostatic sensor comprising an electrically sensitive portion configured to detect an electrical charge, the electrically sensitive portion made of an electrically conductive material, the sensitive portion surrounded by an insulating portion made of electrically insulating material, the insulating portion being surrounded by an electric shielding portion made of electrically conductive material and connected to ground; each zone of the sensor having at least one continuous surface, the sensitive zone of the sensor comprising at least four edges including an upstream edge and a downstream edge connected to one another by two lateral edges, the arrangement of the sensor being such that: a signal-processing unit configured to process the electrical signal generated by the electrical charges of the drops through movement detected by the sensor, the signal processing unit being configured to: