Abstract: A tension mask assembly for a color cathode ray tube includes a tension mask including at least two divided portions, each having a plurality of strips separated a predetermined distance from each other for forming slots, and each having a plurality of bridges for connecting the strips and defining slots, and a frame including first and second support members for supporting both end portions of the divided portions so that tension is applied to the strips of the divided portions and at least one pair of elastic members for supporting the first and second support members.

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 for a cathode ray tube includes a surface hardening layer and a solid-solution and precipitation hardening layer formed under the surface hardening layer.

Abstract: A low-expansion Fe—Ni based alloy for semi-tension masks with excellent creep properties consists of, in mass percentage, from 34 to 38% Ni, from 0.01 to 0.5% Mn, from 0.0003 to 0.0015% B, from 0.0010 to 0.0050% N, and the balance Fe and unavoidable impurities. The alloy further includes from 0.005 to 0.20% Si and from 0.005 to 0.030% Al. Among the unavoidable impurities, C, P and S are controlled to no more than 0.010%, no more than 0.015%, and no more than 0.010%, respectively. The alloy is subjected, at least once after hot rolling or after cold rolling, to annealing in a non-oxidizing atmosphere at between 650 and 750° C. for from 30 minutes to less than 5 hours. The alloy is subjected to stress relief annealing after final cold rolling. A semi-tension mask using the alloy and a color picture tube using the semi-stretched-tension mask, are also provided.

Abstract: A rim made of glass or ceramic material is attached to an alloy sheet with through holes therein at an elevated temperature. Voltages applied to the sheet may be used for focusing electrons passing there through onto a phosphor layer for displaying images. An optional insulating layer is formed on the sheet and optional grid electrodes are formed on the insulating layer for addressing and focusing. Upon cooling, the rim maintains the alloy sheet in tension. Holes in the alloy sheet and the grid electrodes are therefore maintained in proper alignment with cathodes and pixel dots despite temperature variations. The rim also forms a portion of the side wall of the display device, so that once the rim has been aligned with and attached to a cathode plate and face plate, the accurate alignment process has been completed and the assembly of the device is much simplified.

Abstract: A device for shielding the earth magnetic field permeating through a neck of a cathode ray tube (CRT) to improve purity, raster and convergence characteristics in the CRT. The device for shielding the earth magnetic field according to the present invention includes a tube type shielding device, the device made of a material having a high magnetic permeability and low coercive force, and the device having four evenly spaced extension parts formed on the periphery thereof along the CRT axis. The device is made of a Ni—Fe permalloy including Ni of more than 50 weight %, preferably about 78.5 weight %. The device has an inner diameter capable of mounting on the outer surface of the neck. Alternatively, the device may be mounted on the neck by means of a both-sided adhesive tape. The device may be also securely mounted on the neck by means of a thermal contraction tube.

Abstract: A shadow mask is formed with through holes in a predetermined arrangement or pattern. Each of the through holes has a rear surface side hole portion through which an electron beam enters and a front surface side hole portion through which the electron beam outgoes so as to form a beam spot having a predetermined shape on a surface to be irradiated. The front surface side hole portion of the through hole formed at a peripheral portion of the shadow mask has an opening hole area smaller than that of the front surface side hole portion of the through hole formed at a central portion thereof. The front surface side hole portion of the through hole formed at a peripheral portion of the shadow mask may have substantially an elliptical shape having an opening hole width in a direction normal to a virtual line extending from a center of the shadow mask, and the width is made smaller than that of the front surface side hole portion of the through hole formed at a central portion thereof.

Abstract: A color selection mechanism for a color CRT includes a frame to which a color selection electrode thin plate is to be applied, and a color selection thin plate. The surface of the frame to which the color selection electrode thin plate is to be applied is formed from a face represented by a first and a second function in a longitudinal direction from the center axis of the frame. The surface is leftwardly and rightwardly symmetrical with respect to the center axis.

Abstract: The present invention provides a shadow mask having an improved resistance to an impact such as vibration or dropping so as to keep a constant quality of a color cathode-ray tube.

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 1 0.14 ≤ t W t M ≤ 1.0 .

Abstract: In a device for fixing a shadow mask placed between a panel and a shadow mask of a flat CRT (Cathode Ray Tube) and adhered to the panel by a bonding member so as to maintain a constant distance between the panel and the shadow mask, an optimum width of a device for fixing a shadow mask can be calculated in accordance with a tensile force worked on the shadow mask or a variation of a height of the device itself, and a permitted limit of a width of the device can be provided.

Abstract: In a colour display tube (1), the shadow mask (13) serves as the colour selective element. The major part of the electrons emitted by the electron gun (10) are intercepted by the shadow mask (13). These electrons can be absorbed by the shadow mask (13) or they can be reflected. In the first situation, where the electrons are absorbed, the shadow mask (13) is heated as a result of which it will be deformed, leading to misregistration of the electron beams (7, 8, 9) when they impinge upon the phosphor screen (6), causing colour impurities on the colour display tube (1). This phenomenon is commonly referred to as doming. In the second situation, where the electrons are reflected, degradation of the contrast performance takes place because the reflected electrons hit the phosphor screen (6) at totally different positions, leading to the generation of stray light. Both doming and contrast performance are important for the quality of a colour display tube (1).

Abstract: The present invention discloses a magnetic shield structure for a color cathode ray tube 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 consisting of 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 color picture tube has a face panel, an electron gun, a deflection yoke, a shadow mask, a frame for supporting the shadow mask, and a support member for supporting the frame on the face panel, wherein &ohgr;v denotes a vertical scan frequency by the deflection yoke, n denotes an arbitrary integer which satisfies 1≦n≦6, N denotes an arbitrary integer which satisfies 1≦N≦6, &ohgr; denotes a frequency which satisfies &ohgr;=&ohgr;v*n/N, &ohgr;s denotes a resonant frequency of the shadow mask, and the frame, the support member, and the shadow mask are constructed such that the resonant frequency &ohgr;s assumes a value other than the frequency &ohgr;.

Abstract: A mask for a color cathode ray tube (CRT) and a manufacturing method thereof are provided. This mask includes a plurality of strips isolated from each other at predetermined intervals in parallel, and a plurality of bridges for forming slots through which electron beams pass by connecting adjacent strips to each other. In this mask, each of the bridges between adjacent strips has a first curved portion formed on the side from which electron beams come out, and a second curved portion formed on the side upon which electron beams are incident. The first curved portion has a first width in the direction perpendicular to the length direction of the strips, and extends in the length direction of the strips. The second curved portion has a second width that is smaller than the first width in the length direction of the adjacent strips.

Abstract: A bi-potential mask type cathode ray tube includes a vacuum tube formed by integrally sealing a face panel, a funnel and a neck, a phosphor screen formed on an inner surface of the face panel, a plurality of stud pins mounted on an inner surface of a skirt portion of the face panel, while not contacting a metal film, a shadow mask fixed to the stud pins by a mask frame and coupling springs, first and second anode buttons separately mounted on the funnel, a first conductive layer formed on an inner surface of the funnel while covering the first anode button, a second conductive layer formed on the inner surface of the funnel while covering the second anode button, a first conductive member interconnecting the first conductive layer and the metal film for applying a screen voltage to the phosphor screen, and a second conductive member interconnecting the second conductive layer and the mask frame for applying a mask voltage to the shadow mask.

Abstract: A cathode ray tube comprising a color selection electrode supported in tension. The electrode includes a circumferential portion on which vibration damping means are located for damping vibrations in the color selection electrode. The vibration damping means include a resonator in the form of at least one metal tongue, which is capable of vibrating when the color selection electrode vibrates. The tongue is arranged in, or substantially parallel to, the plane of the color selection electrode. Means are provided to exchange vibration by means of collision and/or friction between the circumferential portion of the color selection electrode and the tongue.

Abstract: Disclosed is a rail in flat type CRT(Cathode Ray Tube). The a rail in flat type CRT includes a bulb on which a panel and a funnel are attached; and a rail attached and adhered on an inner surface of the panel for welding a shadow mask in a tension state, the shadow mask serving for a color selection function, wherein the rail is formed by combining two long shafts and two short shafts having a predetermined width and has round parts formed at edge portions of the rail to endure stress due to heat expansion.

Abstract: A color display tube (1) is disclosed, which comprises an improved suspension system of the color selection electrode (12). The color display tube has suspension means that are constructed so as to be self-locking. The suspension means (20) are provided with an additional flat portion (31). This plate has an aperture (32) that is shaped such that it has at least three surfaces of engagement (42, 43) for the free end portion (22) of the supporting elements (17) connected to the inside of the upright edge (18) of the display window (3). When the color display tube is exposed to shock loading, the construction of the flat portion (31) is capable of absorbing this shock without the color selection electrode (12) becoming detached from the supporting elements (17). The action is based on the friction between the surfaces of engagement (42) and the free end portion (22).

Abstract: A flat type color cathode ray tube (CRT) includes a bulb consisting of a flat type panel where a fluorescent film on which inner surface a fluorescent pattern and black matrix are coated is formed, and a funnel extended from the panel, and a frame assembly having a flat type shadow mask installed adjacent to the panel in the bulb and having a plurality of strips for forming a plurality of slits and a tie bar for connecting neighboring strips, wherein a vertical pitch of the black matrix formed on the fluorescent film is less than or equal to a vertical pitch of the tie bar of the flat type shadow mask.

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: 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: 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: A color cathode ray tube having an evacuated envelope including a panel portion, a neck portion and a funnel portion for connecting the panel portion and the neck portion. The panel portion includes a faceplate, a plural-color phosphor screen formed on an inner surface of the faceplate and having a multiplicity of phosphor dots of a plurality of colors. A shadow mask has a multiplicity of apertures therein and spaced from the phosphor screen and a plural-beam in-line type electron gun is housed in the neck portion.

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: An anti-doming composition including a mixture of electron reflecting material such as bismuth oxide, and a zeolite, and a shadow-mask coated with the composition restrict temperature increase by preventing heat transfer, an anti-doming composition including lead and a ZnO, B2O3, Bi2O3 or a mixture thereof, and a shadow-mask coated with the composition protect mechanical expansion of a shadow-mask, and an anti-doming composition including ferroelectrics such as PZT, PT, PZ or PLZT, and a shadow-mask coated with the composition restrict temperature increase by changing the energy of electron beams into non-thermal energy. The shadow-mask of the present invention reduces about 30 to 50% of the anti-doming ratio and has a low production cost and easiness during processes.

Abstract: A tension mask for a color picture tube includes a plurality of strips separated a predetermined distance from each other and parallel to each other, and a plurality of real bridges for connecting the neighboring strips and forming slots through which electron beams pass, the number of the real bridges gradually decreasing from the central portion of the tension mask to the peripheral portion thereof.

Abstract: A frame for use in a color selection mechanism of a cathode ray tube, the frame having a pair of mutually opposing supporting members that has fixedly mounted thereover a color sorting electrode thin plate and elasticity-imparted members each bridged over the corresponding one ends of the supporting members. The frame has a welding gas degassing vent hole that is formed at a position of the supporting member at which the elasticity-imparted member is welded thereto. As a result of this, it is possible to prevent the occurrence of the problems that, after the assembly of the cathode ray tube, the welding gas, the rustproofing oil, etc. are oozed, shot blast balls remain to exist, etc. It is thereby possible to provide a frame for use in a color selection mechanism of the cathode ray tube wherein any defects are prevented from occurring in the tube, such as deterioration of the characteristics, abnormal discharge, etc.

Abstract: A color cathode-ray tube includes a panel portion, a neck portion, a funnel portion connecting the panel and neck portions, a fluorescent layer formed on an inner surface of a face plate of the panel portion, a shadow mask disposed opposite to the fluorescent layer, an electron gun housed in the neck portion, and an internal magnetic shield disposed in the funnel portion. The internal magnetic shield is formed in a substantially quadrangular pyramid-shape having a substantially rectangular first opening with a smaller diagonal dimension at one end adjacent to the electron gun and a substantially rectangular second opening with a larger diagonal dimension than the smaller diagonal dimension at the other end adjacent to the shadow mask.

Abstract: A magnetic shield (20) for a cathode ray tube includes a body portion and a skirt section (21) around the body portion. The skirt section (21) has a skirt portion (23) having a free edge (25) and being connected to the body portion at its opposite edge (26), wherein the length of the free edge (25) is less than the length of the opposite edge (26).

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: Frame assembly in a flat cathode ray tube, the flat cathode ray tube including a panel glass 1 having a fluorescent material coated on an inside surface, a funnel glass 2 fixed to rear of the panel glass 1 having a neck portion formed as one unit with an electron gun sealed therein for emission of electron beams 6 toward the fluorescent material, a deflection yoke 5 fitted on an outer circumference of the neck portion for deflection of the electron beams 6 emitted from the electron gun, a shadow mask 3 fitted to an inside surface of the panel glass 1 having a plurality of apertures for selecting colors, and a frame assembly 7 having a main frame 7a fitted to the shadow mask 3 and a subframe 7b connecting both ends of the main frame 7a, wherein a ratio of second moment of inertia(Ixx/Izz) of the subframe 7b is designed to be within 0.5˜2.7 for avoiding a resonance between the frame assembly 7 and the shadow mask 3, thereby preventing occurrence of howling, effectively.

Abstract: A cathode ray tube includes a rectangular panel having a phosphor screen formed thereon, a neck having an electron gun assembly disposed therein for emitting three electron beams and a funnel. The funnel has a body portion and a cone portion wherein a contour of the cross-section of the cone portion is a non-circular shape and the perpendicular distance from the tube axis to the contour occurs in the substantially diagonal direction with an angle &thgr;′ with respect to the horizontal axis according to the following inequality &thgr;−(4.3+(S/3.8))<&thgr;′<&thgr;+(4.3+(S/3.8)), where &thgr; is the angle in degrees between the diagonal of the face panel and the horizontal axis; S is the distance in mm between the centers of the electron passing holes of the electron gun assembly.

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 cathode ray tube includes a panel having a substantially flat outer surface and an inner curved surface with a phosphor screen. The panel has a substantially rectangular effective screen portion with two long sides parallel to each other, two short sides parallel to each other and four rounded edges interconnecting each long side and the neighboring short side. The effective screen portion is structured such that a first line V1 interconnecting centers of the long sides, a second line H1 interconnecting centers of the short sides and a third line D1 interconnecting centers of the rounded edges opposite to each other meet at a point. The effective screen portion has a first thickness Tv at the centers of the long sides, a second thickness Th at the centers of the short sides, a third thickness Td at the centers of the edges and a fourth thickness Tc at the meeting point of the first to third lines V1, H1 and D1.

Abstract: A shadow mask includes a mask body having a principal mask surface with electron beam passage apertures, a skirt portion, and long and short axes, and a mask frame attached to outside the skirt portion. The mask frame has a coefficient of thermal expansion higher than that of the mask body. The skirt portion includes first and second tongue portions situated on the short and long axes, respectively. Each of the first and second tongue portions is fixed to the mask frame.

Abstract: An inner shield for CRT includes a first protrusion having an upper indented portion and a lower indented portion, and a second protrusion having an upper band and a lower band, wherein the bands are asymmetrical.

Abstract: A tension mask for a color cathode-ray tube, a method for manufacturing the tension mask, and an exposure mask for use in the manufacture of the tension mask are provided. The tension mask is manufactured by depositing photosensitive layers over the top and bottom surfaces of a steel foil. An upper exposure mask with a pattern including a series of parallel upper light transmission portions arranged in lines is aligned over the top surface of the steel foil, and a lower exposure mask with a pattern is aligned over the bottom surface of the steel foil. Here, the pattern of the lower exposure mask includes a series of parallel lower light transmission portions arranged in lines, a plurality of first light shielding portions intersecting adjacent lower light transmission portions among the series of the parallel lower light transmission portions, and a plurality of second light shielding portions partially extending between the edges of the adjacent lower light transmission portions.

Abstract: Shadow mask in a color cathode ray tube that can prevent formation of wrinkles on the shadow mask effectively occurred after welding, including an effective surface part having a plurality of slots formed therein for passing electron beams, and an edge part extended from the effective surface part and welded to a frame fitted to a panel in a cathode ray tube, wherein an interval of welding spots on the edge part is fixed according to a thickness of the shadow mask and a pitch of slots 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: Color cathode ray tube including a panel having a substantially flat outside surface and an inside surface with a curvature, and a shadow mask at rear of the panel formed to have a curvature, wherein, when Rxp denotes a radius of curvature of the inside surface of the panel in a long axis direction, Ryp denotes a radius of curvature of the inside surface of the panel in a short axis direction, Rdm denotes a radius of curvature of the shadow mask in a diagonal axis direction, and ‘W’ denotes a ratio of a thickness of an end portion of an effective surface of the panel to a thickness of a center portion of the panel, the radius Rxp of curvature of the inside surface of the panel in the long axis direction, and the radius Ryp of curvature of the inside surface of the panel in the short axis direction can be respectively expressed as follows;

Abstract: Disclosed is a shadow mask for a flat cathode ray tube capable of achieving the decrement of the phenomena of moire and the improvement of luminance and controlling a bridge shadow thereof, with an optimal design value of the vertical pitch of the apertures of the shadow mask.

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: Frame assembly of a shadow mask in a flat Braun tube, in which a stress on a shadow mask is reduced for minimizing creep during an elevated temperature process, and a low tension on the shadow mask is corrected effectively during operation of a flat Braun tube after the elevated temperature process, for preventing deterioration of a color purity caused by deterioration of howling and doming, including a main frame fitted to the shadow mask, sub-frames connected between both ends of the main frame, and a thermal compensating plate fitted to a bottom of the sub-frames, wherein, first, a ratio(h/t) of a height ‘h’ of the sub-frame to a thickness ‘t’ of the thermal compensating plate is within a range of 4˜8, second, a ratio(b/b′) of a width ‘b’ of the sub-frame to a width ‘b” of the thermal compensating plate is within a range of 0.8˜1.

Abstract: A color cathode ray tube includes a rectangular shadow mask made of an Fe—Ni alloy material, and having an apertured portion, an imperforate portion surrounding the apertured portion and a skirt portion bent back from the imperforate portion, and a rectangular support frame for suspending the shadow mask by spot welding the skirt portion thereto. The skirt portion is provided with plural slits and plural embossments extending in a direction of the height of the skirt portion in one of long and short sides of the skirt portion, and the slits and embossments are juxtaposed around a circumference of the skirt portion. A majority of the slits in the one of the long and shirt sides of the skirt portion are slits delimiting continuous openings in the skirt portion which are not bridged by members other than the support frame.

Abstract: Shadow mask in a color cathode ray tube, which can improve a luminance, prevent moiré and doming in advance, and improve an effect of shadow elimination caused by an opened bridge.

Abstract: A color cathode ray tube is provided with a shadow mask including a substantially rectangular mask body having a large number of electron beam passage apertures, and a substantially rectangular mask frame provided at a peripheral portion of the mask body. The mask frame has a pair of long side walls extending in parallel to the major axis of the mask body and a pair of short side walls extending in parallel to the minor axis of the mask body. Mask holders are respectively provided on the outer surfaces of the long and short side walls, and are engaged with supporting pint provided on a skirt portion of the panel, thereby supporting the shadow mask.

Abstract: An aperture grille, in which tensile strength applied on the aperture grille after it is mounted on a frame body is made uniform to eliminate rupture of grid and variations in elongation caused by heat. The width of each slit on a display surface side and a rear side of the aperture grille is constant in longitudinal direction, and the width of each slit on the display surface side is designed smaller on peripheral portion than at the central portion so that cross-sectional area of each grid of the aperture grille is made larger on the peripheral portion than at the central portion.

Abstract: A shadow mask for color picture tubes has a cathode-side surface covered with a heat-insulating layer, an electron reflecting and absorbing layer, and a heat-emitting cover layer. Some of the electrons are reflected while others are absorbed in the cover layer and transformed to heat, but the heat does not act directly on the mask and is emitted into the interior of the tube. Local temperature differences which particularly occur with high contrast pictures and cause partial doming of the perforated mask are reduced.

Abstract: A shadow mask in a color cathode ray tube, is disclosed, formed with invar alloy thin plate with a texture which allows formation of uniform sized electron beam pass-through holes, with excellent roundness and a small etching deviation in etching, including a ratio aR of a diffraction intensity R{100} of {100} crystal planes to a diffraction intensity R{110} of {110} crystal planes being greater than unity, and a ratio gR of a sum of a diffraction intensity R{100} of {100} crystal planes and a diffraction intensity R{111} of {111} crystal planes to a diffraction intensity R{110} of {110} crystal planes being in a range 2˜20, obtained from the diffraction intensity R{111} of {111} crystal planes, the diffraction intensity R{200} of {200} crystal planes, the diffraction intensity R{220} of {220} crystal planes, and the diffraction intensity R{