Ink jet print head
US4595937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Jun 6, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The head is provided for a conductive ink in contact with an electrode (34) and comprises a container (14) having a capillary nozzle (18, 53) and a counterelectrode (54) set into the nozzle that predetermined thickness of ink is in the front part (53) of the nozzle between the meniscus (52) and the inner part of the nozzle wherein a vaporizing current flows between the electrode and the counterelectrode, thereby to expel the said thickness of ink. For that purpose, the container is closed by an insulating plate (30, 31) on which the counterelectrode (54) is disposed, the counterelectrode in turn being covered by a dielectric layer (56). The nozzle is formed by means of a single hole through the plate, the counterelectrode may be of the same thickness as the said thickness of ink, so that the front part of the nozzle is all through the counterelectrode. The dielectric layer may be a first layer covered by a second layer with a hole in the first layer which is larger in diameter than the nozzle, thereby to create a reserve of ink for the frequent dots. For a multi-nozzle head, the nozzles are produced by grooving a portion of the container and then closing over the grooves by an insu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.