Photoelectron emitting member
US5060805A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1990 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Jun 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/3425
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoelectron emitting member having a multiplex structure comprises a matrix and a protective film. The matrix being selected from the group consisting of elements, inorganic compounds, alloys, mixtures thereof and composites thereof which emit photoelectrons upon exposure to uv rays and other forms of radiation, the protective film comprising at least one material selected from the group consisting of metals, metallic compounds, plastics, polycyclic aromatic hydrocarbon, derivatives thereof or a mixture thereof which is film-forming and not thicker than 0.2 .mu.m. The member can be used in a consistent way over a prolonged period as well as being capable of effective emission of photoelectrons. Fine particles electrically charged with photoelectrons which are emitted upon applying uv rays and/or other forms of radiation to the photoelectron emitting member, can be used in various applications such as (a) separation and classification of fine particles, as well as modifying their surfaces and controlling an electrically charged amount thereof; (b) the measurement of the concentration and size of fine particles in gases such as air and waste gases by using electrically charged fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.