Electron multiplier and methods and apparatus for processing the same
US5990601A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1971 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Feb 22, 1991 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J43/246
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A channel-type electron multiplier and a method and apparatus for rounding off the sharp circular edges, fissures and protrusions at the ends of the holes in the glass plate. In order to do this a temperature gradient is produced through the plate so that only a small portion is heated above the glass softening temperature. The plate thus does not collapse or melt. The said rounded edges improve performance by reducing field emission, noise and photocathode contamination. An electrically heated nichrome wire provides heat pulses at regular intervals. An alternative method utilizes an optical lap after core glass in the plate holes has been partially etched out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.