Amorphous silicon electrographic writing head assembly with protective cover
US5337080A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Apr 27, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/395
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An amorphous silicon electrographic writing head assembly which reduces the voltage drift in the high voltage driving transistor. The writing head including a substrate having a first surface and a second surface, the first surface having thin film elements fabricated thereon, the first surface having a first region, a second region, and a third region, the first region including an array of writing electrodes, the second region including an array of high voltage transistors, and the third region including interconnecting circuitry for connecting the thin film elements to a connector. The head also includes a first cover glass fixed to the first surface of the array covering the first region and a second cover glass fixed to the first surface of the array covering the third region. Also included are a first side glass fixed to the second surface of the array and a second side glass fixed to the first cover glass and the second cover glass whereby a channel is formed over the second region of the array where the high voltage driving transistor is located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.