Abstract: Even if an output voltage from a high-voltage power source includes a ripple, this invention reduces the influence on a luminance output and suppresses the capacitances of a high-voltage power source transformer and smoothing capacitor. An electron-beam apparatus adopts line-sequential driving of allowing a plurality of electron-emitting devices to simultaneously emit electrons in an arrangement in which an accelerating potential for accelerating electrons includes a ripple. At the same time, sets of devices allowed to simultaneously emit electrons are sequentially switched. The frequency of the ripple is synchronized with the selection frequency of line-sequential driving.

Abstract: Even if an output voltage from a high-voltage power source includes a ripple, this invention reduces the influence on a luminance output and suppresses the capacitances of a high-voltage power source transformer and smoothing capacitor. An electron-beam apparatus adopts line-sequential driving of allowing a plurality of electron-emitting devices to simultaneously emit electrons in an arrangement in which an accelerating potential for accelerating electrons includes a ripple. At the same time, sets of devices allowed to simultaneously emit electrons are sequentially switched. The frequency of the ripple is synchronized with the selection frequency of line-sequential driving.

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 (&Dgr;Vs) decreases. Thus, the necessary capacitance of the capacitor (C) of the spike current absorbing means (211) is desirably 0.1 &mgr;F or more.

Abstract: A ceramic firing method particularly suitable for the fabrication of metallic oxide varistor bodies containing a major proportion of zinc oxide and a minor proportion of antimony oxide. Should moldings of this composition be fired in direct contact with a conventional molding stand, antimony oxide would diffuse readily into the stand, with the consequent creation of varistor bodies that are unsatisfactory in their surge withstanding capability. Therefore, in order to avoid such effluence of antimony oxide or like diffusible metallic oxide, the moldings are fired on a diffusion retarder which preferably is of substantially the same composition as the moldings, only with a higher proportion of the diffusible substance. The diffusion retarder may take the form of either flat overlays or loose particles of sintered ceramic material, both placed on the conventional molding stand.

Abstract: An electrically resistive body best suited for providing varistors of high surge withstanding capability and high nonlinearity coefficient over a wide range of current magnitudes. The resistive body is composed of a major proportion of metallic oxides including zinc oxide, bismuth trioxide, antimony trioxide, cobaltous oxide, magnesium oxide, manganous oxide, and boric oxide. To these major ingredients there are added minor proportions of boric oxide and aluminum oxide, or of boric oxide and spinel. For the fabrication of such resistive bodies, the mixture of the noted ingredients in finely divided form are molded into desired shape and size, and the moldings are sintered.