Abstract: An image display apparatus comprises an envelope internally provided with at least an electron emitting source, a fluorescent material member that emits light upon irradiation with an electron beam emitted from the electron emitting source and a getter that maintains the vacuum inside the envelope, and a vacuum exhaust tube that forms a vacuum inside the envelope, wherein the inside of the envelope is partitioned with a substrate into a first space having at least the electron emitting source and the fluorescent material member and a second space containing at least the getter, and the substrate has a path that communicates both the spaces.

Abstract: An image-forming apparatus comprising an envelope formed of a plurality of members, an electron source arranged within the envelope and an image forming member for forming images by irradiation of electron beams from the electron source is manufactured by heating the plurality of members to bond them together to produce the envelope in an atmosphere containing at least a gas selected from reducing gases, inert gases and non-reducing and non-oxidizing gases or in a vacuum. The electron source comprises preferably an electron-emitting element having a thin film for electron emission arranged between a pair of electrodes.

Abstract: An image-forming apparatus is comprised of a substrate, an electron-emitting device which is provided on the substrate and includes an electron-emitting region between electrodes and emits electrons on application of voltage between the electrodes, and an image-forming member which forms an image on irradiation of an electron beam. A diameter S.sub.1 of the electron beam on the image-forming member in direction of application of the voltage between the electrodes is given by Equation (I):S.sub.1 =K.sub.1 .multidot.2d(V.sub.f /V.sub.a).sup.1/2 (I)where K.sub.1 is a constant and 0.8.ltoreq.K.sub.1 .ltoreq.1.0, d is a distance between the substrate and the image-forming member, V.sub.f is a voltage applied between the electrodes, and V.sub.a is a voltage applied to the image-forming member. A method for designing a diameter of an electron beam at an image-forming member face of the image-forming apparatus is comprised of a diameter S.sub.

Abstract: A color picture tube apparatus comprises a color picture tube including an envelope having a phosphor screen excited by a plurality of electron beams, and deflection means generating horizontal deflection field and barrel type vertical deflection field for the beams, including non-linear magnetic field correction means generating an additional pin-cushion type magnetic field in the vertical field to have preferably convergence characteristics such that vertical direction coma errors can be appropriately corrected throughout every portion of the vertical axis on the screen, whereby high-definition color images can be obtained thereon.