Ink jet printer with satellite droplet control
US4734705A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Aug 11, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An externally stimulated continuous stream ink jet printer which suppresses or controls the formation of satellite droplets so that they are not charged differently from the main droplets. Thus, when the two are merged, indeterminate charges are not produced which would impact the print quality of the printer. The satellites are suppressed by impressing on the printer ink streams a combination of time-varying pressures. In one embodiment, the time-varying pressures are generated by two time-varying voltages applied to the EHD electrodes. One pressure has a fundamental frequency with the second pressure having a second harmonic frequency, these two pressures having a predetermined phase and amplitudes with respect to each other. The fundamental frequency is selected for a required drop spacing to stream diameter ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.