Electron-beam apparatus and image forming apparatus
US6294876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2000 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Feb 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention stabilizes the electron emission amount and displays an image on the entire display screen with a luminance faithful to an original image signal, while preventing characteristic degradation and destruction of an electron source. In an apparatus according to this invention, a V/I converter (108) includes n independent constant current sources in correspondence with n column-direction wirings. Each constant current source (108) is made up of an operational amplifier, transistor, and resistor. A voltage limiting circuit (209) uses a diode (D). A limit value setting circuit (110) is constituted by, e.g., a D/A converter and buffer amplifier or a potentiometer and buffer amplifier connected to a power supply. A spike current absorbing means (211) uses a capacitor (C). As the capacitance increases, the wiring voltage rise (.DELTA.Vs) decreases. Thus, the necessary capacitance of the capacitor (C) of the spike current absorbing means (211) is desirably 0.1 .mu.F or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.