Abstract: The invention provides an improved vibration damper for use in a tension mask assembly of a CRT. The improved vibration damper is provided along edges of a tension mask which is attached to a support frame. The vibration damper consists of an elongated strip member having first and second ends mounted to a surface of the tension mask along its borders. A substantial portion of the elongated strip member located between the first and second ends lies in frictional contact with the tension mask to receive vibrations induced in the mask.

Abstract: A cathode ray tube includes a panel with an inner phosphor screen, and a funnel sealed to the panel while facing the phosphor screen. The funnel is externally mounted with a deflection yoke. A neck is sealed to the rear of the funnel while mounting an electron gun to emit electron beams therein. A shadow mask is placed within the panel. The shadow mask has a hole-formation portion with a plurality of beam-guide holes, a non-holed portion externally surrounding the hole-formation portion while being shaped with a rectangular frame, and a skirt bent from the outer periphery of the non-holed portion to the rear of the panel. The skirt has a basic etching portion half-etched at a predetermined roughness. The components of the shadow mask are integrated into one body. A welding portion is formed at the bottom of the skirt with a plurality of welding points. A mask frame is internally suspension-fitted to the panel while being welded to the skirt to support the shadow mask.

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: Notches formed in a skirt portion of a shadow mask include a plurality of first notches formed at long side and short side skirt portions and respectively forming first tongue portions at substantially central portions of the respective long side and short side skirt portions, and second notches formed as pairs so as to sandwich respective corner portions of the skirt portion and respectively forming second tongue portions. At the respective corner portions of the skirt portion, assuming that a length from a peripheral edge of a mask surface to welding points of the respective second tongue portions is Lwd, and a length from the peripheral edge of the mask surface to a distal end of at least one second notch is Lcd, Lcd and Lwd have a relationship of Lcd≦Lwd≦2Lcd.

Abstract: The invention provides a color cathode ray tube using a shadow mask capable of avoiding ruptures or cracks during press-working. The shadow mask has an apertured region having color selecting apertures, and an unapertured region which surrounds the apertured region. A skirt portion is bent from the unapertured region in the direction of the tube axis. The shadow mask has at least two inclined surfaces in a boundary portion between the unapertured region and the skirt portion.

Abstract: The present invention relates to a color cathode ray tube having a spring structure capable of compensating for the displacement of a shadow mask frame, thereby suppressing the degradation of the color purity according to the mislanding of electron beams. The spring according to the present invention includes a stud pin coupling part, a frame welding part and an inclined part as an elastic support body having a predetermined inclination angle between the stud pin coupling part and the frame welding part. Further, the spring is bonded to a plurality of metal members that have different thermal expansion coefficients, while being separated from each other in a length direction of the spring relative to a tube shaft.

Abstract: A cathode ray tube includes a panel having a front screen portion on which a phosphor screen is formed and a panel flange formed on an edge of the front screen portion; a funnel connected to the panel flange; a deflection yoke disposed around the funnel; a neck connected to the funnel, an electron gun disposed in the neck; a color selection apparatus for selecting electron beams emitted from the electron gun and allowing the selected electron beams to land on corresponding phosphors, the color selection apparatus including a frame having a pair of supporting members disposed at a predetermined distance from each other in parallel and a pair of elastic members fixed on both ends of the supporting members to correspond to the lateral sides of the mask; and a shield apparatus for shielding geomagnetism, the shield apparatus being mounted on a circumference of the frame of the color selection apparatus and extended toward the neck.

Abstract: A cathode-ray tube having a luminescent screen on a faceplate panel and a tension mask assembly, wherein the assembly comprises a pair of support blades for supporting a tension mask. The tension mask has a pair of mask borders each being fixed to a respective support blade and a plurality of strands extending between the mask borders. The mask further comprises cross wires extending generally perpendicular to the strands on a screen facing side and at least one shield assembly extending between and attached to the mask borders. The shield assembly has a sheath extending along one side of the mask in contact with at least one strand and a shield attached to the cross wires of the mask in overlapping relation to the sheath.

Abstract: A tension mask frame assembly for a color CRT includes a pair of first and second support members separated a predetermined distance from each other, first and second elastic members installed at end portions of the first and second support members to support the first and second support members, a tension mask installed at the first and second support members such that a tensile force is applied to the first and second support member and having a plurality of electronic beam passing holes formed therein, and a compensation portion installed at the end portions of the first and second support members to make the tensile force applied to the tension mask after heat treatment distributed such that tension at a central portion is greater than that at a surrounding portion.

Abstract: An apparatus and method for terminating crosswires on a tension focus mask. The apparatus includes a set of base segment side rails each having a length and two respective ends. A pair of square tubes attached perpendicular to the respective ends of said base segment side rails to substantially form a rectangle. Also included are a pair of massive side rails having a length and two respective ends mounted above said base segments perpendicularly to said square tubes on each of the side rapid. Beam shield is offered to the massive side rail and insulating members are sandwiched between the side rail and a bus bar. Finally, a tension mask is attached and crosswires are laid and affixed to the bus bar.

Abstract: An inner magnetic shield is provided that reduces mislanding lengths due to electron beam distortion caused by external magnetic fields such as terrestrial magnetism, thereby reducing the occurrence of drifted or uneven color throughout an entire display screen. The inner magnetic shield is of a tube with a plurality of side surfaces, and is provided with at least one skirt (37) that extends to the vicinity of a spanning member (41) at a location where the inner magnetic shield is not in contact with a holding member (42). The skirt (37) is magnetically coupled with the spanning member (42).

Abstract: A slot tension-type shadow mask for the cathode-ray tube, slots of which are provided with a pseudo-bridge, and the pseudo-bridge is provided with the deviation in the Y-axis direction, is disclosed. The deviation in the Y-axis direction means the condition that, in the relation between the width of the etching part at the mask outer peripheral edge part side (outside etching part) in the Y-axis direction and the width of the etching part at the mask center part side (inside etching part) in Y-axis direction on the surface facing to a screen (being opposite in direction to an electron gun) , the inside etching part is longer than the outside etching part. The outside etching part means a part between an endmost point a of the protuberance at the mask outer peripheral side in the Y-axis direction and a surface edge point b of the protuberance at the outer peripheral side in the Y-axis direction on the surface facing to the screen.

Abstract: A shadow mask in a color cathode ray tube is provided including a plurality of slots for passing electron beams therethrough, and a bridge between adjacent slots in a height direction, wherein a portion of the bridge is removed to combine a number of the slots, such that a removal area of the bridge is 1˜30% of an area of the bridge. In another aspect of the present invention, a shadow mask in a color cathode ray tube is provided including a plurality of slots for passing electron beams therethrough, and a bridge between adjacent slots in a height direction, wherein a portion of the bridge is removed to combine a number of the slots, such that an open width of the bridge is 1˜40% of a slot width.

Abstract: Color cathode-ray tube comprising a color selection mask tensioned in at least one direction, the mask having, on its peripheral area, mask-vibration damper means in the form of a coupled oscillator of the type comprising a metal strip whose ends are welded to the surface of the mask and whose central region comes into contact with the surface of the mask by a spring effect.

Abstract: A color display tube with an elongated phosphor screen having a pattern of discrete phosphor elements. In order to reduce landing errors of the electron beams, in particular in the X direction, and simultaneously minimize the amount of magnetic material used for the internal magnetic shield, the color display tube has an internal magnetic shield consisting of a tub that is deep-drawn from a foil, which tube has a bottom with an aperture for allowing passage of electrons. Material of the bottom adjoining the aperture for allowing passage of electrons has been bent outwards from the plane of the bottom. In this manner, material of the bottom of the tub which would otherwise have been cut away is used to enlarge the “virtual” height of the magnetic shield.

Abstract: A cathode ray tube comprises a color selection electrode with a shadow mask fixed to a frame and put under tension. The frame comprises a bimetal element (or bimetal elements) which are constructed such that at a raised temperature the tension is released by reducing the distance between sides of the frame to which the mask is attached. The reduction in distance at the center of the sides exceeds, preferably by a factor 1.5 to 3, the reduction in distance at the corners of said sides.

Abstract: A vibration damping member penetrates through two mounting apertures provided in a shadow mask with tension applied thereto, so as to be attached to the shadow mask in a freely movable state. The vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures and a bridge portion linking these portions. A protrusion protruding toward the shadow mask is provided in the bridge portion of the vibration damping member. This configuration regulates a tilted angle of the vibration damping member with respect to the face of the shadow mask, thus preventing a phenomenon in which a bending portion is caught by the edge of the mounting aperture so that the vibration damping member is pinned by the shadow mask. As a result, the freely movable state of the vibration damping member can be kept always, and therefore vibrations of the shadow mask can be dampened effectively and a color cathode ray tube with reduced color displacement can be provided.

Abstract: A lightweight cathode ray tube is formed by reducing a cross-sectional area on the apeture grill tapes in the aperture grill. One exemplary embodiment of the reduced cross-sectional area aperture grill tape includes a central longitudinal channel in a side of the aperture grill tape that faces away from the screen. The reduction in cross-sectional area reduces a linear density of the tape thereby decreasing the tension required by the frame. As each of the aperture grill tapes includes this central longitudinal channel, the weight of the overall aperture grill is significantly reduced and the aperture grill frame weight is reduced due to the lower aperture grill tension. A method for producing the reduced cross-sectional area aperture grill tape is possible without significantly increasing the cost of manufacturing the aperture grill tape.

Abstract: A cathode ray tube includes a color selection apparatus mounted between a phosphor screen and an electron gun, and support members for supporting the color selection apparatus. Each of the support members is formed by a spring including a fixed section secured to the color selection apparatus, a locking section connected to the cathode ray tube, and a center section formed between these elements. The fixed section and the center section are separated by and bent at a first folding trace, and the center section and the locking section are separated by and bent at a second folding trace. Also, if a direction along a width of the springs is X, the first folding trace has an angle &thgr;1 with a straight line drawn on the fixed section along direction X, and the second folding trace has an angle &thgr;2 with a straight line drawn on the center section along direction X, the angle &thgr;2 is greater than the angle &thgr;1.

Abstract: In the manufacturing process of a color display tube (1), the display window (3) is assembled with the funnel shaped part (4) in a furnace by subjecting them to a heat treatment. This heat treatment can lead to deformation of the color selection electrode (12), because in color display tubes (1) with an invar shadow mask (13), the diaphragm parts (15) are made from invar as well, while the corner sections (16) are made from iron in order to obtain enough stiffness. The difference in expansion coefficient between invar and iron leads to shearing of the welds (22) that connect the diaphragm parts (15) to the corner section (16). To overcome this problem the invention proposes to provide the diaphragm parts (15) with slits (23) or impressions (24), which are arranged so that no stress occurs between the spot welds (22) when the color selection electrode (12) is heated.

Abstract: The present invention provides an improved tension mask frame assembly 10 in which mask support members 40 are provided with side walls 42, 46 and a back wall 44 that are held together primarily by means of either tabs formed along an edge of the back wall 48 received into respective apertures 50 in the side wall 42 or by means of a ridge 69 formed in the side wall 62 which abuts the back wall 64.

Abstract: An Fe—Ni alloy material for a shadow mask having, in terms of % by weight, 34.0 to 38.0% of Ni, 0.05 to 0.45% of Cu, 0.10 to 0.50% of a combined total for Mn and Cu, no more than 0.10% of Si and 0.0004 to 0.005% of S with the balance being Fe and other unavoidable impurities; wherein a total count of MnS precipitates and Cu—S type precipitates having a diameter of 0.01 to 3 &mgr;m located on the surface of a foil strip 0.05 to 0.3 mm thick being at least 2,000 count/mm2.

Abstract: A cathode ray tube includes a faceplate panel having a substantially flat exterior surface and a substantially concave interior surface having a phosphor screen, and a shadow mask behind the faceplate panel wherein the panel satisfies the following condition: 1.2R≦Rp≦8R where Rp is a curvature radius of the concave interior surface and R is 1.767×a diagonal width of an effective screen of the cathode ray tube. The shadow mask has an effective electron beam-passing area having a plurality of apertures, wherein the shadow mask satisfies the following condition: 0.6≦(Rs/Rp)×(PH/S/PH/C)≦1.25 where Rs is a curvature radius of the shadow mask, PH/C is a horizontal pitch of the apertures formed on a central portion of the shadow mask, and PH/S is a horizontal pitch of the apertures formed on a peripheral portion of the shadow mask.

Abstract: When a face portion 4 of a panel portion 1 has a central wall thickness of TC, an end of a useful screen area has a wall thickness of TL, a sealing end surface of a skirt portion has is a width of TS, and an intermediate part of a body portion 7 of a funnel portion 2 is TF, there are established the formulas of; TL/TC≧1.70, TS/TL=0.43−0.50, and TF/TC=0.37−0.49, and a strengthened compressive stress of 5-14 MPa is applied to a side of the skirt portion.

Abstract: The present invention provides A color cathode ray tube comprising: a panel having a flat outer surface and an inner surface that has a predetermined curvature; and a shadow mask, wherein 1 B2 P2 ≤ B3 P3

Abstract: A color cathode-ray tube has an evacuated envelope with an electron gun therein for generating an electron beam. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen-facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive strands and are bonded thereto by the insulating material layer. The insulating material layer is partially or slightly conductive to an extent sufficient to prevent an accumulation of a significant electrical charge.

Abstract: The present invention relates to a getter placement and attachment assembly for securing and placement of the getter along the major axis of a CRT. The getter placement and attachment assembly includes a getter spring for removably securing the getter to an internal magnetic shield affixed to the frame of the color selection electrode or mask frame of a CRT. The internal magnetic shield has sidewalls enclosures with a plurality of apertures therethrough along the major axis of the CRT to permit optimum deposition of a getter film within the CRT.

Abstract: A color display tube (1) is disclosed having an improved suspension system of the color selection electrode (12). The positional stability of the color selection electrode (12) is of eminent importance for the color purity of the color display tube (1). If the color selection electrode (12) slightly shifts, the electron beams (7,8,9) may impinge on electroluminescent material of the wrong color, leading to discolorations. It is recognized that this positional stability is improved by applying free end portions (22) of a smaller diameter on the supporting elements (17) because this will lower the friction between the free end portions (22) and the suspension means (20). This smaller diameter has the disadvantage that the insertion of the color selection electrode (12) into the display window (3) of the color display tube (1) becomes more difficult. This invention solves this problem by applying free end portions (22), which are provided with a centering tip (44).

Abstract: Mask in a color cathode ray tube, including electron beam pass through holes with bridges connected to non-hole portions between the beam pass through holes in a width direction, wherein a thickness of the bridge of the mask facing an electron gun is formed thinner than other portions of the mask, thereby attenuating howling and enhancing luminance.

Abstract: A shadow mask for a cathode-ray tube is provided to improve shock resistance and howling characteristics. A color cathode-ray tube including a panel whose outer surface is near flat and whose inner surface has a specific curvature, a funnel set in the rear of the panel, an electron gun set at a neck placed in the rear of the funnel, and a rectangular shadow mask placed at the inner side of the panel, having a predetermined distance from the inner surface of the panel, to select colors of electron beams emitted from the electron gun. When the radius of curvature of the longer axis of the shadow mask is Rx, the radius of curvature of its shorter axis is Ry, and the radius of curvature of its diagonal axis is Rd, these radiuses of curvature are appropriately designed to increase strength of the shadow mask.

Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is disclosed. The envelope further includes a faceplate panel having a luminescent screen with phosphor lines on an interior surface thereof. A tension focus mask, having a plurality of spaced-apart first electrodes, is located adjacent to an effective picture area of the screen. The plurality of spaced-apart first electrodes has a screen-facing side having a predetermined width and a relatively wider electron-gun-facing side. Each side forming sharp corner edges extending along the length of each first electrodes. A substantially continuous insulating material is deposited on the screen-facing side and on the corners of the first electrodes to shield the sharp corner edges of the first electrodes. A plurality of second electrodes are oriented substantially perpendicular to the plurality of first electrodes and are bonded thereto by the insulating material layer.

Abstract: A vibration damping member penetrates through two mounting apertures provided in a shadow mask with tension applied thereto, so as to be attached to the shadow mask in a freely movable state. The vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures and a bridge portion linking these portions. A protrusion protruding toward the shadow mask is provided in the bridge portion of the vibration damping member. This configuration regulates a tilted angle of the vibration damping member with respect to the face of the shadow mask, thus preventing a phenomenon in which a bending portion is caught by the edge of the mounting aperture so that the vibration damping member is pinned by the shadow mask. As a result, the freely movable state of the vibration damping member can be kept always, and therefore vibrations of the shadow mask can be dampened effectively and a color cathode ray tube with reduced color displacement can be provided.

Abstract: The present invention relates to a color cathode-ray tube having an evacuated envelope with an electron gun therein for generating at least one electron beam. The envelope further includes a faceplate panel having a luminescent screen with phosphor lines on an interior surface thereof. A tensioned focus mask, having a plurality of spaced-apart first conductive lines, is located adjacent to an effective picture area of the screen. The spacing between the first conductive lines defines a plurality of slots substantially parallel to the phosphor lines on the screen. Each of the first conductive lines has a substantially continuous insulating material layer formed on a screen-facing side thereof. A plurality of second conductive lines are oriented substantially perpendicular to the plurality of first conductive lines and are bonded thereto by an insulator. The insulator is typically comprised of one or more electrically insulating material layers, a base coat and a top coat.

Abstract: A tension mask frame assembly for use in a cathode ray tube is provided. The tension mask frame assembly includes a substantially rectangular mask support frame, having a first coefficient of thermal expansion. The frame is formed of a pair of opposing long sides being joined to a pair of opposing short sides wherein one of these pairs has an attachment zone. The tension mask, having a second coefficient of thermal expansion, is supported by the frame at the attachment zones along the opposing sides. The attachment zones are formed of a material having a coefficient of thermal expansion which is approximately the same as the second coefficient of thermal expansion in order to be matched with the tension mask.

Abstract: A structure for damping vibration of a shadow mask fitted to a mask supporting body in a flat cathode ray tube is provided. The structure includes a plurality of damper wires each fastened under tension to the mask supporting body for strapping the shadow mask between beam pass through holes in the shadow mask. The damper wires and the shadow mask are configured such that a first order natural frequency of vibration of the damper wire falls outside a range within ±10% of a third order natural frequency of vibration of the shadow mask. The structure improves vibration damping, reduces the number of required components and simplifies the fabrication process.

Abstract: A color cathode ray tube includes a generally rectangular shadow mask structure in which a skirt portion of a shadow mask is secured to a support frame. The shadow mask is formed by an apertured portion having a large number of electron beam transmission apertures, an imperforate portion disposed around the entire periphery of the apertured portion, a skirt portion being bent back and drooping from the entire periphery of the imperforate portion, and a support frame including a rectangular frame portion. The skirt portion of the shadow mask is secured to the inside of the rectangular frame portion, and a bent portion of the shadow mask, which defines a transitional region between the imperforate portion, and the skirt portion is formed in a shape where long sides are recessed inwardly and ends of the long sides of the skirt portion come into contact with the frame portion.

Abstract: A color selection apparatus for a cathode ray tube, having a panel as a front glass that is formed to be flat, including a pair of supporting members disposed to be separated by a predetermined distance, a pair of elastic members disposed between the supporting members to be coupled with the supporting members, and a mask coupled with the supporting members and formed with a plurality of electron beam passing apertures, the elastic members having a plurality of overlapped plate members, so that it becomes possible to maintain a tension of the mask formed with the plurality of electron beam passing apertures optimally by varying the shapes of the elastic members.

Abstract: A method for making transistors comprises depositing source electrode and drain electrode features onto a substrate through a single aperture in a stationary shadow mask, said aperture having at least two opposing edges; wherein the shapes of the features are defined by the aperture and location of source materials in relation to the substrate.

Abstract: Shadow mask in a color cathode ray tube, which provides an appropriate picture quality for a set resolution and has an increased overall strength by a bi-curvatured structure with a reinforced center portion, including a curvature structure formed according to a curvature function g1(x, y), the curvature function g1(x, y) including a peripheral curvature function f1(x, y) of the shadow mask having a predetermined curvature and a central curvature function f2(x, y) having an almost flat curvature, both the predetermined curvature and the almost flat curvature being formed according to an inside surface curvature of a panel, and a curvature function f3(x, y) having a curvature which is stable in view of structure.

Abstract: In a shadow mask for a color cathode ray tube including a plurality of slots in which electron beams pass, a roughly rectangular-shaped effective surface having long sides and short sides and a skirt portion downwardly curved-extended from the outer surface of the effective surface, wherein a horizontal pitch at the central portion of a shadow mask satisfies a condition of W×0.08%≦Pho≦W×0.086% when a horizontal pitch at the central portion of a shadow mask slot is Pho, a screen effective surface long side length is W and the shadow mask central portion is placed on the center in which the shadow mask effective surface long side is divided into three equal parts. In addition, the shadow mask satisfies a condition of Pho×0.24≦Sw≦Pho×0.30 when a slot horizontal width at the shadow mask central portion is Sw.

Abstract: A cathode ray tube including a shadow mask which is composed of a effective portion having a plurality of holes through which an electron beam passes and a skirt portion extended approximately in a perpendicular direction to the effective portion, wherein a guiding notch is formed in the skirt portion, the guiding notch includes an end portion which is formed to be opened to the end of the skirt portion and a fixing portion to which a guiding means is fixed, and a width of the end portion is wider than the diameter of the fixing portion. Therefore, the doming effect of the shadow mask is reduced and performance of press processing of the shadow mask can be improved.

Abstract: A shadow mask for a cathode ray tube includes an aperture area having a plurality of apertures passing electron beams, a non-aperture area extending a predetermined distance from a circumference of the aperture area and a skirt extending a predetermined distance from an outside circumference of the non-aperture area and bent at a predetermined angle to the non-aperture area, wherein the aperture area has predetermined curvature radii, and wherein if a curvature radius in a horizontal direction of the aperture area is Rhs, and a curvature radius in a vertical direction is Rvs, the following condition is satisfied,

Abstract: A shadow mask for a color cathode-ray tube including a first portion on which a plurality of electron beam through holes are formed; and a second portion on which no electron beam through holes are formed, the second portion surrounding the first surface portion, wherein each of the plurality of electron beam through holes includes an electron beam exit hole, each of the electron beam exit holes of electron beam through holes formed at a periphery of the fist portion near the second portion having a first length Dh in a direction facing away from the center of the shadow mask that is greater than a second length Dv perpendicular to the direction facing away from the center of the shadow mask. Therefore, a vibration generated on the shadow mask is attenuated within an elastic range of shadow mask, and thereby the shadow mask is able to endure an external shock and a permanent distortion to the shadow mask can be prevented to ensure color purity of the color cathode-ray tube.

Abstract: A color selection apparatus includes a frame comprising a pair of supporting members disposed in parallel with each other and a pair of elastic members disposed between and coupled to the supporting members. Each of the elastic members is formed of a hollow tube. A mask is coupled to the supporting members while being applied with a predetermined tension, and exhaust openings are formed for exhausting remaining alien substances from within the elastic members during an assembling process of the color selection apparatus. The exhaust openings are formed on each of the elastic members at a portion adjacent to where the elastic members are coupled to the supporting members.

Abstract: A cathode ray tube including a tube realized through a face panel, a funnel, and a neck; a color selection apparatus including a shadow mask having a an effective area with apertures and a mask frame supporting the shadow mask; an electron gun mounted in the neck and emitting electron beams; a deflection apparatus generating a magnetic field to deflect the electron beams; and a moire compensation circuit performing moire compensation, wherein the color selection apparatus satisfies the following condition, 1 0.76 ≥ Ke Ko ≥ 0.

Abstract: Cathode-ray tube (1) comprising a frame/mask assembly for selecting colors having a mask (8) and a frame (19), the mask being held under tension by being attached to ends of long sides (9) of the frame, the frame/mask assembly being suspended inside the tube using support means (10) which are able to increase the mechanical rigidity of the frame by support means having longitudinal dimples (40) which cause the long sides of the frame to come together during the high-temperature manufacturing phases.

Abstract: The outer surface of an effective portion of a panel is a substantially flat surface or a curved surface having some curvature. If the distances from the center of an effective surface of a shadow mask to the major- and minor-axis-direction ends are H and V, respectively, the effective surface is formed so as to fulfill relations 2≦RH1/RH2≦4 and 1<RV1/RV2≦1.47, where RH1 is an average major-axis-direction curvature radius from the center of the effective surface to a midpoint in the major-axis direction, RH2 is an average major-axis-direction curvature radius from the center of the effective surface to the major-axis end portion, RV1 is an average minor-axis-direction curvature radius from the center of the effective surface to a midpoint in the minor-axis direction, and RV2 is an average minor-axis-direction curvature radius from the center of the effective surface to the minor-axis end portion.

Abstract: To realize a press mask having a large radius of curvature by making the press mask correct a doming by itself, as material which constitutes a shadow mask, a single plate body which is formed of a composite gradient alloy plate having a concentration gradient of an alloy element which is continuously and gradually decreased from a phosphor-screen-side surface to an electron-gun-side surface is used.

Abstract: The present invention provides an improved feeling of flatness of a color cathode ray tube which facilitates the coating operation of a phosphor layer or enlarges an effective area of the phosphor layer. The effective area 4b of the phosphor layer 4 which is formed on an inner surface of a panel and has an approximately rectangular shape is formed in a pincushion shape. At end portions in a diagonal axis D direction of this pincushion-shaped phosphor layer 4b, corner-portion peripheries 4C having a curvature R which are formed in a convex shape outwardly from the effective region 4b are formed in corner regions which connect long-side peripheries sandwiching an X axis and short-side peripheries sandwiching a Y axis.

Abstract: Disclosed herein is a shadow mask for a color cathode ray tube, and more particularly to a shadow mask for a color cathode ray tube having a modified shape and arrangement of slit and embossments of a skirt portion of the shadow mask.