Ink jet print head
US4595938A · 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 primaryB41J2/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The head is provided for a conductive ink (16) and comprises a container (14) having a capillary nozzle (18) where the ink is in contact with a pair of electrodes facing each other across the nozzle, in such a way as to be covered by a predetermined depth of ink between the electrodes and the meniscus (52) at the front end of the nozzle. Printing is effected by vaporization of a portion of ink in a section of the nozzle between the electrodes, which expels the said depth of ink. The container is closed by an insulating plate (30) over which extends a metal strip (37) of smaller width than the diameter of the nozzle. The nozzle is formed by means of a single hole through the plate and the strip, whereby the strip is separated into two electrodes. The metal strip may be disposed between the plate and a front dielectric layer 43. The latter may also be covered by a second insulating layer having a front part of the nozzle therethrough, while the first dielectric layer may have a hole which is larger in diameter than the nozzle so as to create a reserve of ink for the frequent dots. For a multi-nozzle head, the nozzles are produced through an insulating plate over which extend the stri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.