Spraying process for an electrically conducting liquid and a continuous ink jet printing device using this process
US6273559A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/105
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
One or several jets (14) of an electrically conducting liquid such as ink, are emitted at a given speed V.sub.j and are stimulated so as to form drops (22, 24) at a frequency F, at two break off points (C, L) separated by a distance .DELTA.D less than the wavelength .lambda. of the jet, defined by the relation .lambda.=V.sub.j /F. Two contiguous areas are created (20) in the vicinity of these two break off points (C, L), and the potential of these two areas is brought up to constant electrical potentials with opposite signs (V1, V2). Different quantities of electric charge are thus applied on the drops (22, 24), which are relatively constant even if the break off points should vary. A deflection device (30) then deviates the drops to be recycled (24) and the drops to be printed (22) depending on their charge, which depends on their break off point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.