Faceplate for an electrostatic printing tube and method of making same
US4282456A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1978 |
| Grant date | Aug 4, 1981 |
| Priority date | — |
| Expiry date | Sep 8, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for making a faceplate for an electrostatic printing tube involves the positioning of the faceplate at an angle with respect to a collimated light source so that the pins embedded within the faceplate act as a mask to provide shadowed areas which prevent positive photoresist on a transparent conductive coating adhered to a surface of the faceplate from being exposed to light. The photoresist exposed to light is removed and the conductive coating is etched except where the nonexposed photoresist is located thereby forming elongated conductive pads electrically connected to respective pins. The nonexposed photoresist is removed and the conductive pads are plated with a suitable secondary electron emissive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.