Ink-jet head, ink jet printer, and its driving method
US6474784B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Aug 7, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/14314
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink-jet head ejects an ink droplet from an ink nozzle by the charging and discharging between a counter electrode and vibrating plates. The counter electrode comprises a main electrode and an auxiliary electrode, which is provided on the ink-nozzle's side in common with the vibrating plates. Auxiliary charging between the auxiliary electrode and the vibrating plates is effected to vibrate a meniscus in the ink nozzle without ejecting a useless droplet. Consequently, the ink is prevented from forming a film on the meniscus, and an increase of the viscosity of the ink due to evaporation of the ink solvent is prevented by diffusing the ink in the ink passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.