Ink jet printhead with ink viscosity control
US5502467A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Mar 7, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/04581
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the embodiments described in the specification, an ink jet system includes an ink jet head with an ink reservoir and a passage supplying ink from the reservoir to a plurality of pressure chambers from which ink drops are ejected through a corresponding plurality of orifices, along with a viscosity-detecting arrangement for detecting the viscosity of the ink supplied to the pressure chambers and a control system for controlling a heater so as to control the temperature of the ink in order to maintain viscosity at a desired level. In a particular embodiment, the ink-viscosity detector consists of four fluidic elements having different fluidic resistance and inertance values connected in a bridge circuit which is arranged to be balanced when the ink has the desired viscosity value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.