High-frequency drop-on-demand ink jet system
US5757391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Apr 26, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/14201
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the high-frequency drop-on-demand ink jet system described in the specification, a variable impedance characteristic of an ink jet orifice is utilized to provide maximum drop ejection rates exceeding the maximum rates possible with constant orifice impedance characteristics. In one embodiment, successive negative, positive and negative pulses are applied to eject each drop in order to utilize a nonlinear orifice impedance characteristic, permitting maximum ink drop ejection rates exceeding 10-20 kHz and up to 150-200 kHz, and, in another embodiment, the ink jet orifice is designed with a bellmouth shape arranged to enhance the variable impedance characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.