Abstract: The thickness of a face panel is greater at a peripheral edge portion than at a center portion. At the inner surface of the face panel, a curvature radius in a short axis direction on a long axis is set to decrease from the center of the face panel toward a long axis end and, with L representing a distance from the center of the face panel to the long axis end, has a minimal value at a position spaced from the center of the face panel more toward the long axis end than L/2. A phosphor screen on the face panel has phosphor layers and non-emitting black layers and a percentage of the non-emitting black layers per unit area at least in the neighborhood of a diagonal axis end of the face panel is equal to or smaller than that at the center portion of the face panel.

Abstract: In a color cathode ray tube in which the external surface of an effective portion of a panel has a flat surface or a slight curvature, the shadow mask is set such that the layout distance between electron beam through hole array near the long side of an effective surface of the shadow mask is larger in the vicinity of the short axis than the layout distance at the center of the effective surface. Further, the layout distance becomes gradually smaller in direction away from the short axis, and thereafter, the layout distance changes to an increase. In the vicinity of the short side of the effective surface, the layout distance becomes equal to or larger than the layout distance near the short axis. Therefore, the curvature of the shadow mask and the electron beam through hole array are set in proper condition, and mislanding of beam landing due to deformation or oscillation of the shadow mask can be reduced. At the same time, howling of the phosphor screen can be minimized.

Abstract: A shadow mask of a color cathode-ray tube has a substantially rectangular mask main body and a substantially rectangular mask frame fixed to a skirt portion of the mask main body. The mask main body has a curved effective surface formed with a large number of electron-beam passage apertures and opposing the phosphor screen, a non-aperture portion surrounding the outer periphery of this effective surface, and a skirt portion formed in a bent on the outer periphery of the non-aperture portion. The mask main body has a long axis extending in a horizontal direction and crossing with a tube axis, and a short axis extending in a vertical direction and crossing with both the tube axis and the long axis. The effective surface and the non-aperture portion of the mask main body are formed in a curved surface having a radius of curvature in the short axis direction.

Abstract: The outer surface of an effective portion of a panel is a substantially flat surface or a curved surface having some curvature.

Abstract: A shadow body includes an effective area having minor and major axes that extend perpendicularly to each other. Each of electron beam passage apertures formed in the effective area is a communication hole that connects a larger hole opening in one surface of the effective area and a smaller hole opening in the other surface of the effective area. A joint portion between the larger and smaller holes of each electron beam passage apertures in the central portion of the effective area is situated in the thickness-direction central portion of the mask body. A joint portion between the larger and smaller holes of each electron beam passage aperture in the peripheral portion of the effective area is situated closer to the one surface side of the effective area than the thickness-direction central portion is, the larger hole being offset against the smaller hole in the direction of the major axis.

Abstract: A shadow mask includes a substantially rectangular effective region formed having a number of electron beam passage apertures and opposed to a phosphor screen and a substantially rectangular skirt portion provided around the effective region and extending in the direction of a tube axis. The skirt portion has a pair of long sides extending substantially parallel to a major axis and a pair of short sides extending substantially parallel to a minor axis, the long and short sides being welded to the inner surface of a substantially rectangular mask frame. A distance a from an extending end of the skirt portion on each long side to the weld spot is longer than a distance b from an extending end of the skirt portion on each short side to the weld spot.

Abstract: An electron gun assembly of a color cathode ray tube emits at least one electron beam having an oblong cross-sectional shape extending substantially in the horizontal direction, and emits three electron beams in a substantially non-convergent state toward the central portion of a phosphor screen. A deflection device comprises an auxiliary magnetic field generator for generating a quadrupole magnetic field component which focuses the electron beam with an oblong cross section more heavily in the horizontal direction than in the vertical direction. The auxiliary magnetic field generator is located in a given region in a tube-axis direction in which the horizontally deflecting coil is located.

Abstract: A shadow mask includes a shadow mask body opposed to a phosphor screen, and its peripheral portion is fixed to a mask frame. The shadow mask body includes a rectangular effective portion that is formed having a large number of electron beam passage apertures. The effective portion has a major axis and a minor axis that pass through its center and extends at right angles to each other. The shadow mask comprises an auxiliary mask fixed to a region that contains the minor axis of the effective portion of the shadow mask body. The auxiliary mask is in the form of a strip that extends long in the direction of the minor axis and has a large number of electron beam passage apertures that communicate individually with the electron beam passage apertures of the effective portion.

Abstract: A main body 34 of a shadow mask is opposed to a phosphor screen and is formed in a substantially rectangular shape. The main body 34 has a main surface portion 31 where a number of electron beam apertures are formed, and a skirt portion 33 provided around the main surface portion with a non-aperture portion 32 interposed between the skirt portion and the main surface portion. A plurality of rectangular openings 38a extending in the long axis direction (or X-direction) of the mask body are formed at the skirt portion. Concave portions 47 extending in the long axis direction (X-direction) of the mask body are formed at the non-aperture portion. The openings and concave portions are provided within a range of about ¼ of the length W of the mask body in the long axis direction, with respect to a center of the range defined at a position distant from the short axis Y by about ⅓ of the length W of the long axis direction of the mask body.

Abstract: The thickness of a face panel is greater at a peripheral edge portion than at a center portion. At the inner surface of the face panel, a curvature radius in a short axis direction on a long axis is set to decrease from the center of the face panel toward a long axis end and, with L representing a distance from the center of the face panel to the long axis end, has a minimal value at a position spaced from the center of the face panel more toward the long axis end than L/2. A phosphor screen on the face panel has phosphor layers and non-emitting black layers and a percentage of the non-emitting black layers per unit area at least in the neighborhood of a diagonal axis end of the face panel is equal to or smaller than that at the center portion of the face panel.

Abstract: A skirt portion of a mask body includes cut portions. The width of the cut portions along the minor or major axis ranges from 0.10×L to 0.45×L, where L is the distance from an end of the minor or major axis to a diagonal end, and the height of the cut portions along the tube axis is equal to 5% to 40% of the height of the skirt portion along the tube axis in a region near the minor or major axis.

Abstract: A color cathode ray tube having a reinforcing band, which constricts the outer periphery of a skirt portion of a vacuum envelope, arranged so as to fulfill a relation, b≧2.0a, where a is the distance between first and second planes along a tube axis, the first plane intersecting an end edge of the skirt portion and extending perpendicular to the tube axis, the second plane containing the central axis of stud pins supporting a shadow mask and extending perpendicular to the tube axis, and b is the distance between the first plane and a third plane along the tube axis, the third plane intersecting a side edge of the reinforcing band facing a vacuum envelope funnel.

Abstract: A deflection yoke of a cathode ray tube apparatus comprises a pair of saddle-type horizontal deflection coils located symmetrically with respect to a central axis and substantially in the shape of a truncated pyramid. A magnetic core substantially in the shape of a truncated cone is located coaxially around the horizontal deflection coils, and a pair of vertical deflection coils are wound on the magnetic core. A relation between a space vf between a large-diameter end portion of the magnetic core and each of the horizontal deflection coils and a space vr between a small-diameter end portion of the magnetic core and each of the horizontal deflection coils, with respect to the direction of a vertical axis perpendicular to the central axis, is given by vf≧vr.

Abstract: A panel is provided with a substantially rectangular effective portion that has a substantially flat outer surface, and a phosphor screen is formed on the inner surface of the effective portion. A shadow mask that is opposed to the phosphor screen includes a substantially rectangular mask body formed having a large number of electron beam holes and a mask frame supporting the peripheral edge portion of the mask body. The interval between the electron beam holes in the direction of the major axis of the mask body increases from the center of the mask body toward the major axis end so that the rate of change of the interval has a maximum value in the region between the center of the mask body and the major axis end.

Abstract: Provided is a color cathode ray tube, which comprises a panel including a substantially rectangular effective portion, of which the outer surface is a flat surface or a slightly curved surface, and a shadow mask having an effective surface opposite the inner surface of the effective portion of the panel. In this color cathode ray tube, the inner surface of the effective portion of the panel is a curved surface having a substantially infinite curvature radius RXp1 in the major-axis direction on the major axis thereof near the center, a predetermined curvature radius RXp2 in the major-axis direction near peripheral portions on the major axis, and another predetermined curvature radius in the minor-axis direction on the minor axis thereof. This color cathode ray tube, with its panel having the substantially flat outer surface, enjoys improved visibility and higher strength for the maintenance of the curved surface of the shadow mask.

Abstract: A shadow mask has a mask body and a substantially rectangular mask frame attached to a peripheral portion of the mask body. The mask body has a substantially rectangular curved effective surface opposed to a phosphor screen formed on an inner surface of a panel. The effective surface has a number of electron beam passage apertures. The effective surface of the mask body has a curvature in a direction of the long axis, which is set within a range of about 0 to 2×10−4 (1/mm) over an area from a center of the effective surface to a middle portion of the effective surface in the direction of the long axis. A curvature at a peripheral portion in the direction of the long axis is set to be greater than that at the middle portion. A curvature on the short axis in the direction of the short axis successively increases over a distance equal to at least two thirds of a distance between the center and an effective end of the short axis.

Abstract: A color cathode ray tube has a shadow mask. The shadow mask is composed of an almost rectangular mask body and an almost rectangular mask frame. The mask body has an effective surface facing a fluorescent screen, a non-aperture section surrounding the effective surface, and a bent skirt section formed on the periphery of the non-aperture section. The mask frame has a sidewall section provided on the skirt section of the mask body. In the shadow mask of such a configuration, a step section having a step in the direction perpendicular to the skirt section of the mask body is formed. With this configuration, the strength with which the curved surface of the effective surface of the shadow mask is enhanced, which prevents the color purity from deteriorating due to deformation and facilitates the formation of the shadow mask.

Abstract: A color cathode ray tube is provided with a shadow mask having a mask body including a substantially rectangular effective surface in which a large number of electron beam passage apertures are formed.

Abstract: A substantially rectangular shadow mask is arranged opposite to a phosphor screen formed on an inner surface of a panel. The shadow mask has a mask body and a mask frame to which a peripheral portion of the mask body is attached. The shadow mask has a rectangular form having a center through which a tube axis passes, and a long axis and a short axis passing through the center and perpendicular to each other. The mask frame has a pair of long side walls extending parallel to the long axis and a pair of short side walls extending parallel to the short axis. The height of each long side wall at a central portion along the tube axis is lower than the height of each short side wall at a central portion along the tube axis.

Abstract: A shadow mask of a color cathode-ray tube includes a substantially rectangular mask main body and a rectangular mask frame attached an outer periphery of the mask main body. The mask main body has a substantially rectangular main surface portion formed of a curved face having a large number of electron beam passage apertures, the main surface portion having a longer axis and a shorter axis perpendicular to the longer axis, and a skirt portion raised in peripheral edges of the main surface portion. The skirt portion has a pair of longer side walls extending substantially in parallel to the longer axis, and a pair of shorter side walls extending substantially in parallel to the shorter axis. Each of the longer side walls includes a pressing portion located near the shorter axis so as to protrude toward the mask frame and pressing the mask frame.