Thermal drop-on-demand ink jet print head
US4870433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Jul 28, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/14387
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An array of resistive heater elements, each of which is connected in an electrical circuit between a common electrode and one of the control electrodes. Each of the resistive heater elements comprises a plurality of portions arranged so that a small elongated opening in provided at the middle of the heater element where no resistive material is present. Each of the resistive heater elements, when energized, has a bubble formed at each of the plurality of portions. All of the bubbles coalesce to form a single pillow-shaped bubble which causes a drop of ink to be ejected from the associated nozzle. During collapse of the bubble, the bubble collapses inwardly so that cavitational shock impacts the heater element at the opening and little or no damage to the resistive heater is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.