Process for the manufacture of thick layer varistors on a hybrid circuit substrate
US4460624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1982 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Aug 31, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/06546
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a process for the manufacture of non-linear resistors (varistors) from thick-layer ceramic material, in particular on a hybrid circuit substrate, or any other device requiring that a predetermined temperature should not be exceeded during its manufacture. According to the invention, after crushing a ceramic material in order to obtain a very fine powder of varistor material, a powder is produced of conductive or semiconductive material able to assume the pasty state at a temperature lower than 850.degree. C. and a binder is incorporated therein to obtain a screen printing paste. The layer deposited by screen printing on a substrate such as glass, is dried and then heat treated so as to assure cohesion of the layer. This layer is either inserted between a previously deposited electrode and another electrode, or covered by two separate electrodes. The invention is particularly applicable to matrix access display screens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.