Abstract: A structure of an electron gun for a color cathode ray tube capable of reducing a drive voltage by creating an optimum relation among a cathode, a first electrode, and a second electrode mounted in the electron gun, and preventing degradation in response to input signals on a high-resolution screen and a focus characteristic.

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: An inner shield assembly capable of maximizing an external magnetism shield effect. The inner shield assembly is provided at the rear side of a frame assembly for shielding external magnetism and includes a main body for shielding the inside of a funnel, a rectangular beam shield combined to the front of the main body and a front portion extending from the edge of the front of the beam shield around the outside of the shadow mask and the frame assembly. The material of the front portion has a maximum permeability of at least 3,000 and a coercivity of at most 1.25 Oe.

Abstract: A color cathode ray tube including a generally rectangular shadow mask having a curved aperture portion having a multiplicity of electron-transmissive apertures, a curved imperforate portion surrounding and integral with said apertured portion and a skirt portion being bent back from a periphery of said curved imperforate portion; said skirt portion being provided with a plurality of embossments and a plurality of: (a) tilted slits or (b) a plurality of tilted slits with bridge.

Abstract: The present invention discloses a cathode ray tube including a deflection yoke which can remarkably decrease a leakage magnetic field. In the deflection yoke, a diameter of an end of a ferrite core to a screen side is 50% to 85% of a diameter of an end of a horizontal deflection coil to the screen side, and an interval between the end of the horizontal deflection coil to the screen side and the end of the ferrite core to the screen side is 27% to 50% of a length of the horizontal deflection coil in a tube axis direction. As a result, the cathode ray tube can overcome problems of general cancel coils, and reduce the leakage magnetic field even at a high deflection angle.

Abstract: The present invention relates to a cathode ray tube having a deflection yoke including a circular ferrite core and a deflection coil whose cross-section is in a rectangular shape for improving a deflection sensitivity of the cathode-ray tube, and more particularly to a cathode ray tube, in which one part of a vertical deflection coil having a rectangular shaped cross-section to improve a lead-in capability when winding the vertical deflection coil located between a ferrite core and the holder is separated by a predetermined gap from a holder that isolates a horizontal deflection coil and the vertical deflection coil.

Abstract: In a mask frame for a cathode ray tube in accordance with the present invention, by satisfying 0.80≦a/(Xd/4)+b/(Yd/4)+c/(Dd/4)≦1.25, herein, Xd is a long side length of the mask frame, Yd is a short side length thereof, Dd is a diagonal length thereof, a is a height of the center of the long side thereof, b is a height of the center of the short side thereof, and c is a height of the corner portion, assembly can be facilitated, howling and drop characteristics can be improved, a width of a panel can be reduced, and accordingly the cathode ray tube can be slimed down and light-weighted.

Abstract: A mask assembly for a color cathode ray tube, has an amount of tension applied to a shadow mask thereof reduced by preventing a main frame for applying tension in the shadow mask from deformation due to creeping during a high temperature process, by regulating the ratios of thickness, width, and height of the main frame to the thickness of the shadow mask. The color cathode ray tube comprises a frame composed of a main frame welded to the shadow mask for supporting the shadow mask toward the panel and a sub-frame supporting said main frame, wherein relations T/t≧45, W/t≧270, and H/t≧270 are satisfied, where t is a thickness of the shadow mask, T is the thickness of part where a main frame is welded to a shadow mask, W is a width of part attached to a sub-frame of a frame, and H is a length of main frame from said shadow mask to the sub-frame.

Abstract: Flat CRT panel including a substantially flat outside surface, and an inside surface of a fixed curvature, wherein the inside surface of the panel is formed to meet a condition of {(Rh+Rv)/2}×Rd being in the range of 8.0-10.3, where “Rd” denotes a representative diagonal sectional radius of curvature, “Rh” denotes a representative long-axis sectional radius of curvature, and “Rv” represents a representative short-axis sectional radius of curvature when an effective screen size of the panel is greater than 25″, thereby reducing thermal breakage, and permitting fabrication of lighter panel.

Abstract: Disclosed is a cathode ray tube with an electron gun capable of improving a resolution of an image by preventing electron beams from striking electrodes and efficiently controlling a spot size that is susceptible to a change in current capacity.

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 funnel structure of a CRT in which provided that a deflection angle is 110° or more, a length of an outer surface evaluation line formed by connecting a TOR outer surface end where the funnel yoke portion and the funnel body portion meet and a neck seal outer surface end where the funnel yoke portion and the neck portion meet by a straight line is ‘a’ and a length of a straight line from the outer surface evaluation line where a vertical distance between the funnel yoke portion outer surface and the outer surface evaluation line is maximized, to the neck seal outer surface end is ‘b’, a formula of 0.20≦b/a≦0.40 is satisfied, so that a sensitivity of a deflection yoke is improved and a beam shadow neck margin of the electron beam can be satisfied.

Abstract: Disclosed is an electron gun for a cathode ray tube capable of improving substantial resolution by improving the alignment of a triode portion. The electron gun includes a triode portion composed of at least one cathode for emitting electron beams, and a first electrode and a second electrode for controlling emission amount of the electron beams, a focus electrode and an anode electrode forming a prime lens for focusing the electron beams on a screen, and at least two guide holes housed in more than two electrodes for use of assembly besides electron beam passage holes, in which at least one guide hole is circular and at least one of the other guide holes is non-circular.

Abstract: A funnel in a CRT includes a body part welded to a panel, a cone part connected to the body part having a deflection yoke fitted thereto, and a neck part connected to the cone part having an electron gun sealed therein. The cone part is formed such that &Dgr;Y/&Dgr;X={YD-(DD*sin&thgr;2)}/{XD-(DD*cos&thgr;2)} is greater than 4, where DD denotes a diagonal length, XD denotes a long axis length, YD denotes a short axis length, and &thgr;2 denotes a diagonal angle between the long axis and the short axis.

Abstract: An electron gun for a color cathode ray tube efficiently modulates magnetic field of a velocity modulation coil. The electron gun contains at least two focus electrodes receiving a fixed focus voltage, and the focus electrodes are arranged in a row in the electron gun. When a sum of lengths of the focus electrodes is ‘L’ and a sum of intervals of the electrodes is ‘g’, the relationship (g×100)/L=5-30(%) is satisfied.

Abstract: A funnel structure for a cathode ray tube satisfies following equations 0.33≦Rhmaj/Rhmaj≦0.51, Rhmaj=Hmaj/Umaj, Rmaj=amaj/bmaj, wherein a length of a major axis evaluation line as an imaginary line connecting the major axis outer end of a sealing surface, at which a panel meets a funnel, with the major axis outer end of a TOR (top of round), at which a body portion meets a yoke portion, is defined as bmaj; a length from a point on the major axis evaluation line, which has a maximum vertical line length to the outer surface of the funnel, to the major axis outer end of the sealing surface is defined as amaj; a maximum length of the vertical line is defined as Hmaj; and ½ of a major axis length of an effective surface of the panel is defined as Umaj.

Abstract: A cathode ray tube having a cathode comprising a sleeve with a heater. installed therein and a base metal with a side portion covering an outer circumference of the sleeve and an upper surface portion covering an upper side: of the sleeve, satisfies the following formula: tS≦tB1≦2tS, wherein tB1 is a thickness of the side portion of the base metal and tS is a thickness of the sleeve. Therefore, the warm-up time taken for formation of an image after power is applied to the cathode ray tube can be shortened.

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.

Abstract: Flat CRT panel including a substantially flat outside surface, and an inside surface with a certain radius of curvature, wherein the panel is formed such that (Ts/Tm)*CFT*Rz falls on a range of 28-36, where CFT denotes a center thickness, Ts denotes a diagonal effective screen edge thickness Ts, Tm denotes a maximum thickness at an interface of the skirt and the effective screen, and Rz denotes an inside radius of curvature, i.e., a value obtained by dividing a diagonal effective screen sectional radius of curvature Rd by a representative value {Rd/(1.767*a diagonal length of the effective screen)}, thereby minimizing breakage during heat treatment and reducing a production cost.

Abstract: The present invention relates generally to an electron gun for a color cathode ray tube, and more particularly to an electron gun for achieving an excellent focus characteristic on the whole screen by forming a dynamic quadruple lens in the electron gun used for a transpose scan type cathode ray tube.