Abstract: The color-separating electrode structure for use in a color CRT includes a color-separating electrode body which is substantially rectangular in form and fixed in a tensioned condition to a frame made by a sheet metal bending or flexing process. The frame includes two supporting parts opposed to each other, each of the supporting parts having a flexed portion that extends in parallel to an upper edge and a lower edge of the color-separating electrode body and has a predetermined curvature. The color-separating electrode body is welded to the frame at contact portions thereof each of which is in contact with corresponding one of the flexed portions of the supporting parts.

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: In a color cathode ray tube in which a shadow mask and an inner magnetic shield are supported by a mask frame and an electron shield is provided in the mask frame, at least a part of the electron shield is made to have a smaller anhysteretic magnetic permeability than the shadow mask, the mask frame and the inner magnetic shield when an applied magnetic field is 800 A/m (10 Oe). Since the magnetic resistance of the electron shield increases, it is possible to reduce a leakage magnetic field from a tube-axis-side edge of the electron shield. Thus, a color cathode ray tube that reduces mis-landing due to a terrestrial magnetism and has no color displacement can be provided.

Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is provided. 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 lines and are bonded thereto by the insulating material layer. The insulating material layer comprises a low porosity lead-zinc-borosilicate glass.

Abstract: Disclosed is a color cathod ray tube which can effectively improve impact resistance by setting a ratio of a curvature coefficient (a/b) of the shadow mask for a long axis to be in a range of about 100,000-135,000, and by setting a ratio of a curvature coefficient (c/d) of the shadow mask for a short axis to be in a range of about 60,000-360,000. Also, in defining ratios between a curvature radius of a center portion of the shadow mask and curvatures radiuses along a horizontal direction, a vertical direction, and a diagonal direction, the curvature radius decreases towards the peripheral portions of the shadow mask, thereby improving impact resistance and drop characteristics and thus effectively preventing color purity from being degraded.

Abstract: A tension mask assembly for a flat color Braun tube is disclosed, in which each of main frames is bent at a middle portion in the width direction, and has a portion perpendicular to a tension mask defining a partition and another portion opposite to the tension mask defining a lower plane, wherein widths of a middle portion and both ends of the lower plane are formed in the range of the following equation: 0 < w 1 - w 2 w 2 ≤ 1.0 . Also, it is possible to prevent the tension mask assembly from howling, and to prevent the tension mask from being deformed or broken during a heat treatment, and stiffness of the main frames can be enhanced.

Abstract: A color cathode-ray tube employs a tint or dark tint glass panel having optimal transmittance in order to solve a problem of brightness balance of a periphery to a center of a screen becoming degraded due to a difference between glass transmittances. The cathode-ray tube comprises a panel, an external surface of which is substantially flat and an internal surface of which has a fluorescent screen with a predetermined curvature, and a shadow mask which is placed at a predetermined distance apart from the internal surface of the panel and has a plurality of electron beam through-holes formed therein.

Abstract: A method and apparatus of maintaining spacing between tension mask strands in a tension mask. The method includes providing a tension mask with strands connecting therebetween and attaching a set of barrier ridge elements to a first side of the strands. Next, the tension mask is tensioned and affixed to a mask frame to form a mask frame assembly.

Abstract: A Cathode Ray Tube (hereinafter, CRT), includes a mask assembly which is composed of a main frame for supporting the shadow mask and a sub frame for supporting the main frame. When the minimum distance between the flat surface extended from the upper surface of the main frame and the flat surface extended from the lower surface of the sub frame is Lb, the height of the sub frame is Ls and the minimum distance between the flat surface extended from the upper surface of the main frame and the flat surface extended from the lower surface of the sub frame, in case the mask is attached to the mask assembly, is La, the following equation, 0.40≦Ls/Lb≦0.55 or 0.45≦(Ls−Lm)/Lb≦0.59 is satisfied and after compression, the following equation, 0.08≦(La−Lb)/(Lb-Lm)≦0.17 is satisfied.

Abstract: A shadow mask is arranged to face a phosphor screen formed on an inner surface of a panel. A plurality of aperture columns are formed in parallel in the shadow mask. Each aperture column includes a plurality of apertures arranged in line at a predetermined interval. On both sides of each aperture column on the surface of the shadow mask facing the electron gun, stripe-shaped dielectric layers for acting on electron beams toward the apertures are formed respectively, and extend in substantial parallel with the aperture columns. The shadow mask is manufactured in such a manner that stripe-shaped insulating material layers are formed on the surface of a mask base material facing the electron gun, the mask base material is thereafter shaped into a predetermined shape, and the insulating material layers on the shaped mask are sintered.

Abstract: In present day color display tubes (1) the microphony performance of the shadow mask (13) is becoming increasingly important, especially in color display tubes (1) with a flat or nearly flat outer side of the display window (3). This invention discloses a mask frame (14) which by means of the transfer of vibrations from the outside of the color display tube (1) to the shadow mask (13) is hampered. This makes the shadow mask (13) less sensitive to vibrations, leading to an improved performance with respect to color purity. This object is achieved by providing the diaphragm parts (15), which form a part of the mask frame (14), with indents (27). Preferably, the skirt (19) of the shadow mask (13) is connected to the diaphragm part 15 by providing one spot weld (28) in between each pair of adjacent indents (27).

Abstract: The present invention provides a tension mask having a frequency distribution with improved vibration damping. The tension mask includes a center portion between two edge portions. The tension mask also has a parabolic frequency distribution between the edge portions whereby the center portion has a central frequency distribution value and the edge portions have a relatively lower peripheral frequency distribution value characterized in that the range of variation between the center and edge portions frequency distribution value is in the closed interval of about 8 Hz≦&Dgr;≦12 Hz.

Abstract: A material is provided for marking aperture grilles for use in a color picture tube which has excellent yield strength, high temperature creep strength, and superior magnetic characteristics as compared to conventional materials. The material is made by cold-rolling a low carbon sheet containing 9 to 30 weight % of Ni or 9 to 30 weight % of Ni and 0.1 to 5 weight % of Co, and annealing the cold-rolled steel sheet at a temperature of 400-500° C.

Abstract: A color selection mask is provided with an aperture region including a slit region (21) and bridge regions (22). The bridge regions (22) are provided on top and bottom ends of the aperture region. In the slit region (21), slits (123) through which electron beams pass and strips (124) are arranged alternately. The strips (124) extend into the bridge regions (22), where bridges (25) for connecting adjacent two of the strips (124) and through holes (122) through which electron beams pass are provided.

Abstract: A tension mask frame assembly for a color CRT includes a tension mask having an effective area having a plurality of electron beam passing holes and an ineffective area disposed at an edge portion of the effective area, a frame including support members which support opposite side portions of the tension mask so that tension is applied to the tension mask and rigid members which support end portions of the support members to maintain a gap between support members, and at least one weight member installed by a fixing unit to be separated at a predetermined interval in the ineffective area of the tension mask in a lengthwise direction of the tension mask fixed at the frame.

Abstract: A first frame includes a bottom portion, an inclined portion, a joint portion and a lateral portion for supporting a shadow mask. Between the lateral portion and the joint portion, a space is provided except where the lateral portion and the joint portion are welded. The joint portion is inclined with respect to the lateral portion such that the space enlarges with an increase in the distance from an edge of the lateral portion on the side of supporting the shadow mask. With this configuration, foreign substances can be removed from between the lateral portion and the joint portion in the process of cleaning the first frame, making it possible to both suppress the deterioration of high-voltage withstand capabilities of a color cathode ray tube and prevent the poor welding of the first frame.

Abstract: An internal magnetic shield includes a pair of opposing long side walls (1), a pair of opposing short side walls (2), and an opening (3) enclosed by these side walls in the center. The short side walls (2) are provided with notches (4) having a substantially home-plate shape. This configuration can reduce mislanding of an electron beam on the entire screen and easily balance the amount of mislanding due to geomagnetism in the tube-axis direction and in the horizontal direction perpendicular to the tube axis. As a result, a cathode ray tube capable of displaying images without displacement and unevenness of colors can be provided.

Abstract: There is provided a color cathode-ray tube comprising a panel having a fluorescent plane formed on the inner face thereof, and a shadow mask arranged at the inner side of the panel having a predetermined distance therefrom, in which the shadow mask has an effective area in which electron beam passage holes are formed and a non-effective area surrounding the effective area, and at least one half etching line is formed at the non-effective portion of the shadow mask. Accordingly, shocks due to vibration of the cathode-ray tube are absorbed not to transmit to the shadow mask, improving the curved surface supporting strength of the shadow mask.

Abstract: A magnetic shield structure for a color cathode ray tube is provided which can improve color chrominance, rotation redundancy and magnetic field redundancy of the color cathode ray tube, by preventing an electron beam from being moved due to an earth magnetic field, so that the electron beam can be landed on a designated fluorescent material. Accordingly, in a color cathode ray tube including a tension mask assembly comprising a tension mask for color-discriminating an electron beam, and a main frame and a sub frame for supporting the tension mask, and a magnetic shield structure disposed at a funnel, for preventing deflection and distortion of the electron beam, the magnetic shield structure includes a main unit for shielding the inner sides of the funnel, and a front unit where the tension mask assembly is inserted.

Abstract: A cathode ray tube includes a panel with a substantially flat outer surface and an inner curved surface. The inner curved surface of the panel has a phosphor screen. A funnel is connected to the panel while externally mounting a deflection unit for deflecting electron beams. A neck is connected to the funnel while internally mounting an electron gun for emitting the electron beams. A color selection apparatus is internally fitted to the panel such that the electron beams land on correct phosphors of the phosphor screen. The panel has an effective screen with short and long axis. The panel bears a first thickness Th at the ends of the effective screen in the long axis direction, and a second thickness Tv at the ends of the effective screen in the short axis direction. The second thickness Tv of the panel is established to be larger than the first thickness Th of the panel.

Abstract: A tension mask frame assembly of a color cathode-ray tube, the assembly including a tension mask including a plurality of parallel strips spaced at predetermined intervals apart from each other and a plurality of real bridges for connecting adjacent strips to each other to form slots through which electron beams pass, the number of real bridges gradually decreasing in a direction from the center portion of the mask to the peripheral portion thereof, a frame for supporting the tension mask so that a tensile force is applied to the tension mask in the direction of strips, and at least one damper which is installed on the frame and contact the strips of the tension mask.

Abstract: The color cathode-ray tube includes a panel having a fluorescent screen formed on the inner surface thereof, a funnel coupled to the panel, an electron gun mounted into the neck portion of the funnel for emitting electron beams toward the fluorescent screen, and a shadow mask mounted on the fluorescent screen formed on the inner surface of the panel and having a predetermined distance from the fluorescent screen for carrying out color selection. The shadow mask is in a rectangular shape having a longer axis and a shorter axis and including a plurality of beam through apertures. The vertical pitch of the beam through apertures is between 0.15 mm and 0.35 mm. The vertical pitch of the beam through apertures increases as it goes from the central portion to the end portion of the shorter axis of the shadow mask.

Abstract: Disclosed are a shrinkage band and a cathode ray tube (CRT) comprising the same. The shrinkage band includes includes a pair of spaced apart parallel first sides, a pair of spaced apart parallel second sides perpendicular to the first sides, the second sides being longer than the first sides, and corner portions connecting the first and second sides such that the corner portions are provided at four corners of the shrinkage band, wherein the shrinkage band is configured to go around an outer circumference of a CRT face panel skirt to apply tension to the face panel, and wherein the first sides, the second sides, and the corner portions of the shrinkage band comprise two materials each having a different permeability.

Abstract: The present invention relates to a cathode ray tube, and more particularly to a cathode ray tube having a shadow mask for obviating doming phenomenon caused by thermal expansion and deterioration of color purity.

Abstract: The invention relates to a cathode-ray tube having funnel sealed at one end to a faceplate panel with a viewing screen on an interior surface thereof, the funnel and the faceplate panel form an evacuated envelope, and a mask frame assembly supported within the envelope and in proximity to the screen. The cathode-ray tube includes a knee action circuit connector which electrically connects the internal conductive coating which is supported on an inside surface of the funnel. The knee action circuit connector is disposed between the exterior surface of the magnetic shield and the inside surface of the funnel and extends from the magnetic shield to form a curved first contact portion resiliently engaging the conductive coating of the funnel and a second contact portion extending from the curved portion and urged inwardly against the exterior surface of the internal magnetic shield thereby making electrical contact between the conductive coating and the internal magnetic shield.

Abstract: In color display tubes (1) the color purity performance is of the utmost importance. One of the factors adversely affecting this color purity performance is the microphony behavior of the shadow mask (13). Vibrations or shocks coming from outside the color display tube (1) can be transferred to the shadow mask (13) via the suspension means (20) of the color selection electrode (12). By introducing a vibration damping element (40, 45) coupled to the resilient element (30) of the suspension means (20), the amount of spot shift on the screen (6) due to these vibrations is reduced by at least 50%. The vibration damping element (40, 45) is preferably a flat plate which is rigidly coupled with one side to the suspension means (20), while the other side is in close contact with the resilient element (30), as a result of which it is capable of absorbing said vibrations.

Abstract: A tensioned mask structure for a color CRT includes a color-selecting mask that is formed with a plurality of electron beam passing holes therein, a mask frame on which the color-selecting mask is mounted, and a vibration-attenuating mechanism in contact with the color-selecting mask to damp vibration of the color-selecting mask. The color-selecting mask includes an effective mask area having a slit region and a slot region. The slit region has a plurality of long narrow elements that extend in a vertical direction of a screen of the CRT and are aligned to define slit-like holes between adjacent long narrow elements. The slot region has a plurality of slot-like holes shorter than the slit-like holes, the slot-like holes extending in the vertical direction. The slit region is formed in an area except a left peripheral portion and a right peripheral portion of the effective mask area.

Abstract: Masking device for a flat-screen color-display cathode-ray tube, comprising a support frame for a tensioned shadow mask and a tensioned shadow mask. The support frame is made of a hardened Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 5×10−6 K−1 and a yield stress Rp0.2 at 20° C. of greater than 700 MPa; the tensioned shadow mask is made of an Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 3×10−6 K−1; the Fe—Ni alloys are chosen so that: below a temperature T1, the mean expansion coefficient &agr;20-T, between 20° C. and T, of the alloy of the support frame is greater than the mean expansion coefficient &agr;20-T of the alloy of the shadow mask, and above T1 the coefficient &agr;20-T of the alloy of the frame is less than the coefficient &agr;20-T of the alloy of the shadow mask, where T1<350° C. and preferably <300° C.

Abstract: A metallic foil and a transparent substrate film are laminated with an adhesive layer. The roughness of the adhesive-layer-side surface (lower surface) of the metallic foil is such that the maximum height Rmax is more than 0 and less than 4 &mgr;m. As long as the maximum height Rmax falls in the range, the adhesive layer never contains air bubbles in such sizes that reflectance is adversely affected. The roughness of the surface (upper surface) of the metallic foil, opposite the adhesive-layer-side surface, is preferably such that the arithmetic mean roughness Ra is between 0.02 &mgr;m and 1 &mgr;m. As long as the arithmetic mean roughness Ra is in this range, it is possible to efficiently conduct vacuuming to bring, into close contact, a photosensitive resin layer and a photomask in sheet form placed on the photosensitive resin layer, before effecting the pattern-wise exposure of the photosensitive resin layer.

Abstract: A tension mask assembly for a flat cathode ray tube includes a tension mask having a plurality of strips separated from one another by a predetermined gap, real bridges connecting adjacent strips to thus define slots through which electron beams pass, and first and second dummy bridges extending from adjacent strips toward each slot therebetween, the tension mask being installed such that its top surface faces a panel forming a screen and it is separated from the panel by a predetermined gap, a plurality of supporting members disposed at opposite sides of the tension mask to support the tension mask, and a plurality of rigid members secured to opposite ends of the supporting members to apply tension to the tension mask. A first etching boundary formed at an end of the first dummy bridge near to the center of the tension mask is lower with respect to the screen than a second etching boundary formed at an end of the second dummy bridge near to the periphery of the tension mask.

Abstract: A color picture tube has a tensioned mask supported by a support frame mounted within said tube. The mask has a significantly lower coefficient of thermal expansion than the frame. Intermediary members are located between the mask and the frame. The intermediary members are of a material having a coefficient of thermal expansion similar to that of the mask. Each of the intermediate members is attached to the frame by a plurality of connectors. Each of the connectors is elongated, and each of the connectors is attached at one end thereof to one of intermediate members and attached at an opposite end to said frame.

Abstract: A shadow mask for use in a cathode ray tube comprises a mask body having a mask effective section where a number of electron beam passage apertures are formed and a skirt portion provided at a peripheral edge of the mask effective section, and a mask frame arranged to be layered outside the skirt portion. The mask frame and the skirt portion are resistance-welded to each other at a plurality of portions. At each welding portion, a plurality of concave and/or convex portions each having a smaller area than an area of a contact surface of an electrode for resistance-welding are formed at an inner surface portion of the skirt portion which the electrode contacts.

Abstract: An inner shield for a cathode ray tube includes a screen opening and an electron gun opening through which electron beams pass, and a main body including a pair of long sections and a pair of short sections interconnected to form the screen opening and the electron gun opening. A cathode ray tube includes the inner shield. Each of the short sections includes a cutaway section having a pair of first cutaway sections formed starting from the electron gun opening and extending at a predetermined angle for a predetermined distance toward the screen opening, and a second cutaway section formed starting from where the first cutaway sections end and extending inwardly toward the screen opening, the second cutaway section being formed to extend past imaginary lines formed from where the first cutaway sections end to a furthermost inward point of the second cutaway section, that is, the point of the second cutaway section closest to the screen opening.

Abstract: The invention relates to a flat color CRT in which the upper plate width of a frame for tensioning and fixing a shadow mask is enlarged so that the CRT is free from an influence from howling of the shadow mask and welding and productivity of the shadow mask and the frame may be simplified. The shadow mask assembly comprises a shadow mask having an effective area with slots and a non-effective area without slots in the periphery; and a frame fixing body for tensioning the shadow mask; wherein the shortest distance tM from the outermost end of a main frame welded to the shadow mask to the interface between the effective area and the non-effective area and the width tW of the mask welding part formed at the upper part of the main frame have the relation of 0.14 ≤ t W t M ≤ 1.0 .

Abstract: The present invention provides a color cathode ray including a pair of long frames, a pair of opposing short frames that are fixed to the pair of long frames and support the long frames, and a shadow mask fixed to the pair of long frames in a state applied with a tensile force. The short frames have substantially-triangular bent parts formed to protrude toward the shadow mask. Since such a cathode ray tube can decrease an internal moment of the shadow mask structure, the displacement of the shadow mask in a direction to recede from the phosphor screen surface of the color cathode ray tube can be suppressed and the q-value deviation also can be suppressed even if the shadow mask is expanded by heat generated by an impact of electron beams.

Abstract: The present invention relates to a shadow mask comprising an effective surface including electron beam passage holes all over, an ineffective surface having a certain width surrounding the circumference of the effective surface, a skirt portion curved formed on the circumference of the ineffective surface, and concave-compressed beads formed on the ineffective surface along the skirt portion in order to improve the stiffness of the effective surface. The present invention can prevent distortions of a screen by forming the beads on the ineffective surface which is capable of improving stiffness of the shadow mask by increasing a lot value of the section modulus performing a function resisting the relative vibration occurred between the effective surface and skirt portion.

Abstract: A tension mask frame assembly for a color cathode ray tube, includes: a tension mask having a plurality of strips on which slots are formed, the slots being separated by a predetermined distance from each other on a thin plate; real bridges for partitioning slots at a predetermined pitch interval by connecting adjacent ones of a plurality of strips to each other; and a frame which supports the corresponding edges of the tension mask; whereby the vertical pitch of the real bridges becomes smaller, such as in a stepwise relation, in a direction from the center portion of the tension mask to the peripheral portion of the tension mask.

Abstract: A color picture tube having a tensioned mask supported by a frame mounted within the tube. The frame is constructed of a carbon steel material, and the mask is constructed of a nickel alloy material that expands substantially less per unit length than does the frame in the normal operating temperature range of the tube, and expands substantially the same per unit length as the frame in the higher thermal cycling temperature range used during tube processing.

Abstract: A color cathode-ray tube 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 tensioned focus mask, having a plurality of spaced-apart strands, is located adjacent to an effective picture area of the screen. The spacing between the strands defines a plurality of slots substantially parallel to the phosphor lines on the screen. Each of the strands has a substantially continuous insulating material layer formed on a screen-facing side thereof. A plurality of cross-wires are oriented substantially perpendicular to the plurality of strands and are bonded thereto by the insulating material layer. The plurality of cross-wires are bonded to busbars (located at opposite ends of the focus mask) with a resistive coating that has adhesive properties.

Abstract: A color selection electrode and a method of producing the same, for a high definition cathode ray tube with a finer pitch of mask apertures free from limitations due to the thickness of the iron-alloy plate of the mask.

Abstract: A material for a shadow mask, characterized in that it has a chemical composition: C=0.0030 wt %, Si=0.03 wt %, Mn: 0.1 to 0.5 wt %, P=0.02 wt %, S=0.02 wt %, Al: 0.01 to 0.07 wt %, N=0.0030 wt %, B: an amount satisfying 0.5≦B/N≦2, and balance: Fe and inevitable impurities, and can form a shadow mask having a coercive force Hc of 90 A/m or less; and a method for producing the material, characterized in that use is made of a raw material having the above chemical composition, the finishing temperature in hot rolling is lower than Ar3 point by O to 30° C., the coiling temperature is 650 to 700° C., and the rolling reduction percentage in the final rolling (secondary cold rolling) is 30 to 45%. The material produced by the method exhibits magnetic characteristics being uniform in a coil and excellent as described above.

Abstract: A color selection apparatus for a cathode ray tube, having a frame formed with a pair of supporting members arranged facing each other at a predetermined distance therebetween and a pair of elastic members coupled to the supporting members; and a mask formed with a plurality of slits for passing electron beams and fixed to the supporting members under tension. Each of the elastic members is formed with a pair of opposite parts facing each other in parallel at a predetermined distance therebetween, and a connection part perpendicularly arranged between the opposite parts. The opposite parts are preferably opposite each other in a direction where the electron beams advance (z-axis direction of the cathode ray tube). Alternatively, the opposite parts are opposite each other in a major direction of the mask (x-axis direction of the cathode ray tube).

Abstract: A cathode-ray tube comprises a color-selection frame/mask assembly, the mask being held under tension by being welded onto the ends of the long sides of the frame, the frame/mask assembly being suspended within the tube with the aid of supports capable of serving to augment the mechanical rigidity of the sides onto which these supports are welded and to cause the long sides of the frame to approach closer to each other during the phases of manufacture at high temperature.

Abstract: A method and apparatus of maintaining spacing between tension focus mask strands in a tension focus mask. The method includes providing a tension focus mask comprising busbars with crosswires connected therebetween. A permanent adhesive is applied to the screen-side of the mask strands. Next, novel non-permanent horizontal guide members are attached to the gun-side of the mask strands, where an adhesive is applied to the guide member before the guide members are applied to the mask. The guide members maintain the vertical mask strand spacing during: (1) the application of the horizontal crosswires to the screen-side of the mask and (2) the subsequent thermal processing. The thermal processing cures the adhesive on the screen-side of the mask, thereby: (1) permanently attaching the crosswires to the mask strands and (2) volatilizing the adhesive on the gun-side of the mask strands such that the non-permanent guide member detach from the mask strands.

Abstract: Shadow mask in a color CRT including an electron reflective film formed, starting from a surface of the shadow mask, down to an inside surface of each of holes, or an electron reflective film formed on a surface of the shadow mask facing an electron gun, or on the surface of the shadow mask and an inside tapered surfaces of holes of the shadow mask and another electron reflective film formed on a surface of the electron reflective film formed on the shadow mask facing an electron gun, thereby reducing thermal deformation of the shadow mask, with a consequential reduction of doming, that prevents mislanding of the electron beams, color dispersion of the color CRT, to improve a color purity.

Abstract: A shadow mask includes an aperture area having a plurality of apertures through which electron beams pass; a non-aperture area extending a from a circumference of the aperture area; and a skirt formed extending from an outer circumference of the non-aperture area at a predetermined angle, wherein the front surface of the aperture area is formed satisfying the following conditions,

Abstract: A shadow mask is formed by press molding and includes a substantially rectangular mask effective portion in the form of a gently sloped dome having electron beam passage apertures and a skirt portion extending from the peripheral edge of the mask effective portion. The skirt portion has a plurality of apertures arranged parallel to the peripheral edge of the mask effective portion and spaced from one another and belt portions formed between the apertures and an extending end edge of the skirt portion and extending along the extending end edge. Each of the apertures is formed so that its width increases from the peripheral edge of the mask effective portion toward the extending end edge side of the skirt portion.

Abstract: To provide a display device having the long lifetime and the high reliability by preventing the generation of a spark or a dark current between terminals of cathode lines and an anode, a shielding member is arranged between the terminals of the cathode lines and the anode so as to ensure shielding between the terminals and the anode.

Abstract: Due to a slit formed in the dead space, a cathode ray tube capable of preventing incorrect hitting of color electron beams caused by the local doming phenomenon from occurring and thus preventing displacement of colors, unevenness in colors, and deterioration of luminance from occurring is provided. The cathode ray tube comprises a shadow mask having an effective area where lines of apertures for passing electron beams are arranged and a dead space formed on both outer sides of the effective area. In the dead space, a slit extending along the lines of the apertures is formed. Accordingly, the thermal expansion of the dead space caused by a temperature increase can be reduced, and the stress applied to the aperture line of the effective area adjacent to the dead space can be suppressed. As a result, the local doming phenomenon can be prevented from occurring.

Abstract: Disclosed is a color cathode ray tube that can optimize the distance between a spring hole of a spring and a welded junction point and the distance between the junction points with respect to the weight of a mask-frame assembly. The color cathode ray tube includes the mask-frame assembly and a panel that are assembled together by fastening a fixing pin formed on an inner surface of the panel into the spring hole formed on one end portion of the spring of which the other end portion is fixed to the mask-frame assembly directly or through two or more junction points of a spring holder. The cathode ray tube satisfies the condition of 5.0<(A/B)×W≦8.0, where A(cm) is a distance between a center of the spring hole and a center of the junction point most adjacent to the spring hole (i.e., the shortest junction point), B(cm) is a distance between the center of the shortest junction point and the center of the junction point apart farthest from the spring hole (i.e.