Patent Number: 6,294,876

Title: Electron-beam apparatus and image forming apparatus

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.

Inventors: Ando; Muneki (Atsugi, JP), Shino; Kenji (Yokohama, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G09G 3/04 (20060101); G09G 3/10 (20060101); G09G 3/20 (20060101); G09G 3/22 (20060101); G09G 003/10 ()

Expiration Date: 09/25/2018