Electron-emitting device with electron blocking layer, electron source, and image-forming apparatus
US7276843B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2002 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Jul 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J3/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to enhance a converging property of an electron beam in an electron-emitting device in which a cathode electrode, an insulating layer, and a gate electrode are laminated and a through hole is formed by partially removing the gate electrode so as to obtain an exposed portion of the cathode electrode. In such an,electron-emitting device in which the cathode electrode, the insulating layer, and the gate electrode are laminated and the through hole is formed by partially removing the gate electrode so as to obtain the exposed portion of the cathode electrode, only a central region of the electron-emitting layer on the cathode electrode is connected to the cathode electrode. With this structure, it becomes possible to generate an electron beam only from the central region of the electron-emitting layer connected to the cathode electrode and to realize an electron-emitting device having a small beam diameter and a high-definition image-forming apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.