Apparatus for keying in electron beams
US4169229A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1978 |
| Grant date | Sep 25, 1979 |
| Priority date | — |
| Expiry date | Aug 10, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J37/045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an illustrative embodiment an electron beam is keyed into an operative scanning path through a small aperture by applying keying signals of opposite polarity to respective symmetrically arranged meander conductors. The keying signals produce respective traveling waves which periodically come into proximity to the beam electrons (in synchronism with beam velocity) at successive points along the beam path. The opposite potentials of the meander conductors except during keying operations produce transverse fields at the interaction points which progressively deflect the beam out of its operative path. During key-in, the effective deflection field on a beam electron packet is abruptly decreased in magnitude at each successive interaction point while the symmetrical arrangement of the meander conductors along the beam axis avoids the production of a longitudinal field component which would provide an adverse defocussing effect on the beam electrons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.