Electrostatic inkjet head having spaced electrodes
US6322198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Apr 2, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/14314
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An electrostatic inkjet head has first and second electrodes. The first electrode is supported on a substrate and the second electrode is on a diaphragm so that a gap is formed between the first and second electrodes. A drive circuit is connected to the first and second electrodes to apply a voltage or pulse between the electrodes. When a voltage is applied between the electrodes, an electrostatic attraction force is generated between the electrodes. The attraction force displaces the diaphragm toward the substrate. This displacement of the diaphragm is used for the ejection of ink. Also, when the voltage is turned off, opposing central portions of the first and second electrodes define a gap that is greater than that defined by opposing end portions of the first and second electrodes. On the other hand, when the voltage is turned on, the opposing central portions of the first and second electrodes define another gap that is substantially equal to that defined by the opposing end portions of the first and second electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.