Drop-on-demand ink jet print head
US5087930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An extremely compact ink jet print head has an array of closely spaced nozzles which are supplied from densely packed ink pressure chambers by way of offset channels. The ink supply inlets leading to the pressure chambers and the offset channels are designed to provide uniform operating characteristics to the ink jet nozzles of the array. To enhance the packing density of the pressure chambers, the ink supply channels leading to the pressure chambers and offset channels are positioned in planes between the pressure chambers and nozzles. An optional ink purging pathway is provided for purging bubbles and other contaminants from the chamber side of the nozzles. The ink jet print head may be assembled from plural plates with features in all but the nozzle defining plate being formed by photo-patterning and etching processes without requiring machining or other metal working.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.