Photomultiplier
US5438191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1993 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Aug 6, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J43/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention pertains to a photomultiplier of head-on type that has a transparent tubular glass bulb and a principal photocathode formed on the internal surface of a closed end of the glass bulb, that is, on the internal surface of a light entrance window. In addition, this photomultiplier has a side photocathode formed on the entire internal surface of side wall of the glass bulb in the region adjacent to the principal photocathode. A reflection film is formed on the outer surface of side wall of the glass bulb and opposes to the side photocathode. Some light entering the peripheral portion of the light entrance window of the glass bulb and traveling toward the outer surface of side wall is reflected inwardly by the reflection film and reaches the side photocathode, where the light is to be converted into photoelectrons. The photoelectrons are guided to the electron multiplying unit in glass bulb, where the photoelectrons are multiplied and detected by an anode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.