Abstract: A cathode ray tube capable of reducing a doming amount and suppressing an occurrence of moire stripes by providing protruding portions in a slot aperture of a tension type shadow mask. In a cathode ray tube including a mask frame formed in the form of a frame, and a shadow mask made of a flat plate containing a plurality of slot apertures, which is stretched and held onto the mask frame with a tension force applied in the longitudinal direction of the apertures, the shadow mask is provided with bridges linking the slot apertures arranged neighboring in the longitudinal direction, and the slot aperture is provided with protruding portions facing each other and protruding from the both ends in the lateral direction of the slot aperture into the inside of the slot aperture. Thus, it is possible to reduce the doming amount and to suppress an occurrence of moire stripes, while securing the mechanical strength and luminous intensity.

Abstract: A color cathode ray tube comprises (i) a glass bulb comprising a substantially rectangular panel, on which phosphors of a plurality of colors are arranged, a funnel that is connected to a rear side of the panel, and a neck portion formed at a rear side of the funnel, in which an in-line electron gun for emitting an electron beam is arranged; (ii) a substantially rectangular shadow mask having a plurality of apertures that are arranged in correspondence with the phosphors on the panel; and (iii) a substantially rectangular mask frame having a wall portion that supports opposing skirt portions of the shadow mask. The surface of the shadow mask with the apertures is convex towards the panel. A central portion of the opposing skirt portion is convex in a direction of the tube axis on the side of the electron gun. Processing warps such as wrinkles in the skirt portions of the shadow mask are avoided, and a color cathode ray tube with good color rendition is obtained.

Abstract: An aperture grille which can suppress vibrations of a flat grille without marring the appearance of a screen by not arranging damper lines inside an effective screen region of a cathode-ray tube. A pair of damper members 130A and 130B for damping the vibrations of a flat grille 110 are provided in upper and lower regions of the flat grille 110 outside an effective screen region of a cathode-ray tube. The damper members 130A and 130B are supported under a given tension by support members 132 and 134 mounted on second frames 124A and 124B of a frame member, thereby keeping pressure contact with the surface of the flat grille 110. Because the damper members 130A and 130B are not exposed to the effective screen region of the cathode-ray tube, the damper members 130A and 130B are out of sight from the front side of the screen, thus suppressing the vibrations of the flat grille 110 without marring the appearance of the screen.

Abstract: A tension mask assembly of a flat CRT is provided. The tension mask assembly includes a tension mask, which is placed to be opposite to a phosphor screen formed at an inner surface of a panel a predetermined distance from the phosphor screen and which serves to discriminate colors of electron beam; an aperture grill, which serves as an electron beam transmitting hole and which is formed on an effective surface of the tension mask having a slot or a dot shape; a rail which is supported by applying a predetermined tension to both ends of a long side part or short side part of the tension mask; a support bar, which supports both ends of the rail by being arranged in a direction that crosses with the rail and which has a support spring and a tamper wire disposed thereon; and a tension controlling member, which has a different rate of thermal expansion from the support bar and which is placed in a longitudinal direction against a side wall of a support bar.

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

Abstract: A shadow mask assembly for a cathode ray tube (CRT) includes a color selection electrode provided with a large number of beam-passing apertures, a mask frame having a pair of supporting members and a pair of elastic members disposed so as to maintain a predetermined distance between the supporting members, a plurality of spring holders mounted on the supporting and elastic members, each of the spring holders comprising a spring fixing portion and a frame fixing portion that are arranged in a longitudinal direction of the spring holder, one of the spring and frame fixing portions being formed of a bimetal and the other being formed of a uni-metal, and a spring for supporting the mask frame on an inner surface of a cathode ray tube panel, the spring having a first end fixed on the spring fixing portion of the spring holder and a second end fixed on a stud pin embedded in an inner surface of the cathode ray tube panel.

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: 1 0 < w 1 - w 2 w 2 ≤ 1.0 .

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: A shadow mask assembly for color cathode-ray tube comprises a mask frame which has a rectangular frame like shape and which is composed of a pair of short side mask frame members and a pair of long side mask frame members. Each of the short side mask frame members has a bimetal structure which bends according to variations in temperature. A shadow mask having a rectangular shape is attached to the long side mask frame members. When temperature rises, the short side mask frame members bend toward a direction in which an increase in the tension of the shadow mask is cancelled and, when temperature falls, the short side mask frame members bend toward another direction in which a decrease in the tension of the shadow mask is cancelled. Therefore, the tension of the shadow mask does not vary and the shadow mask does not deform from the original cylindrical surface. Thus, the Q-value is kept constant, and color purity does not deteriorate.

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: A mask frame assembly for a color picture tube includes a mask having a portion in which a plurality of electron beam passing holes are formed, a second frame for supporting the mask, a first frame in which the second frame is inserted, and an elastic member provided between the first and second frames for absorbing an impact, the elastic member including a first plate member having a first fixed portion fixed to the second frame and a second plate member to be coupled with the first plate member having a second fixed portion fixed to the first frame.

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: 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: Disclosed is a structure of panel in flat-type CRT (Cathode Ray Tube), which is capable of securing a stable vacuum intensity by applying a sufficient tension to a face part of a panel using a straight safety band, and of effectively reducing an advance of crack and a scatter of fragments due to an external shock by optimizing the relationship among an MMH (Mold Match Height), a CFT (Center Face Thickness) and an OAH (Overall Height), which are design factors. The structure of panel in flat-type CRT (Cathode Ray Tube) includes a face part having a flat outer surface and an inner surface of a fixed curvature, and a skirt part extending from an edge of the face part to a rear portion.

Abstract: A shadow mask structure to which this invention is applicable comprises a mask frame and a shadow mask. The mask frame is provided with a frame plate and a pair of major sidewalls. The frame plate has a rectangular outline-shape limited by a pair of major plate sides and a pair of minor plate sides. The major sidewalls are perpendicularly risen from the major plate sides. The shadow mask has a rectangular shape limited by a pair of major mask sides and a pair of minor mask sides. The shadow mask is spanned between the ends of the major sidewalls so as to be tensioned and so that a main surface of the shadow mask is shaped into a predetermined curvature. The shadow mask structure further comprises a pair of elastic wires. Each of the elastic wires has a fixed end region attached to the minor sidewall and a free end region touched to the minor mask side. The free end region is touched to the minor mask side at strength such that the curvature of the shadow mask is not changed.

Abstract: A mask frame comprises a sidewall portion in the form of a rectangular frame including a pair of long sidewalls opposed to each other, a pair of short sidewalls opposed to each other, and corner sidewalls between the long and short sidewalls, and a base portion extending from the sidewall portion toward the center of the rectangular frame. The base portion has beads located near the corner sidewalls and connecting the long and short sidewalls.

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 selection mechanism for a cathode ray tube and a cathode ray tube with the color selection mechanism of the present invention constitute a color selection mechanism for a cathode ray tube wherein support members have substantially angular-U-shaped sections and an opposing side is longer than a side on which a substantially angular-U-shaped color selection electrode extends, or a color selection mechanism for a cathode ray tube wherein each of elastic members is formed of a hollow member constituted by a member having an angular-U-shaped section and a closing plate for closing the opening of the member. A color cathode ray tube is equipped with the color selection mechanism. As a result, an increase in cost of materials is restrained as well as the mechanical strength of a frame of a color selection mechanism is increased.

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

Abstract: 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 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: 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 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 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: 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: 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: 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 tension mask frame assembly for a color picture tube includes a tension mask where a plurality of strips formed on a thin plate to be separated a predetermined distance forming slots, a plurality of tie bars for connecting the strips and sectioning the slots at a predetermined pitch, and a plurality of dummy bridges extending from at least one strip toward a facing strip in the slots sectioned by the tie bars, and a frame supporting the edge of the tension mask so that a not less than can be applied to the tension mask. In the tension mask frame assembly, the area of the dummy bridge of the tension mask is smaller from the central portion of the tension mask to the peripheral portion thereof.

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: The present invention relates to a flat tension mask type CRT which improves structures of a shadow mask and a panel, herein the shadow mask has a thickness of 50 &mgr;m˜80 &mgr;m, the panel has a transmittance of 47%˜50%, the flat CRT has a luminance of not less than 31 FL, and the panel has a thickness of 13 mm˜14.5 mm, accordingly the present invention is capable of heightening productivity and durability, and at the same time improving overall luminance and color vividness by increasing the thickness of the shadow mask.

Abstract: Frame in a cathode ray tube, and more particularly, to a frame of a tension mask type assembly for supporting a shadow mask to apply tension thereto in a cathode ray tube.

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 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 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: A bracket is provided to couple a mask frame to a stud of a panel in a color picture tube having a tube axis. The mask frame has a rectangular rim in parallel with the tube axis and a flange vertically extending from a rear end of the rectangular rim towards the tube axis. The bracket includes a suspending arm disposed in parallel with the tube axis and provided with a hole coupled to the stud, a fixing arm fixed on the rectangular rim of the mask frame, and a vibration absorber connecting the fixing arm and the suspending arm and having a predetermined length.

Abstract: A color display tube (1) is disclosed with an improved suspension of the color selection electrode (12). In order to have a color display tube (1) with good properties of, for instance, color purity, it is of eminent importance that the positional stability of the color selection electrode (12) is excellent. Especially wide-screen tubes seem to be more sensitive to shocks by which the color selection electrode (12) may shift and cause discolorations. The positional stability of the color selection electrode (12) can be improved by increasing the stiffness of the corner sections (16) of the color selection electrode (12). This can be realized by introducing an additional support plate (41) in the corner section (16). Also the optimization of the position of the supporting element (17) with respect to this corner section (16) yields an improvement.

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{

Abstract: An inner shield for a cathode ray tube comprising a plurality of rectangular segments parallel to the tube axis; a flange joined to each of the rectangular segments and bent in a right angle for mounting on a mask frame; a trapezoid portion joined to each of the rectangular segments, being arranged slantwise along an inner circumference of a funnel; and a pair of holes formed in the two adjacent trapezoid portions to decrease a deflection in a East-West direction of an electron beams. Since an undesirable affection on the electron beams caused by the earth magnetic field is decreased, a pin-cushion distortion and barrel distortion of the electron beams are highly decreased.

Abstract: A tension mask frame assembly for a color cathode-ray tube, the assembly including a tension mask and a frame, is provided. The tension mask has a plurality of strips isolated from each other at predetermined intervals on a thin plate to form slots, and tie bars for partitioning slots at a predetermined pitch interval by connecting adjacent strips to each other. The frame has a pair of support members for supporting the longer sides of the tension mask, a pair of elastic members, the ends of which are connected to both ends of each of the support members so that the support members are isolated from each other a predetermined distance, and a reinforcing member having both ends coupled to both ends of the exterior side surface of each of the support members and its center portion contacting with the exterior side surface of each of the support members, the reinforcing member for elastically restoring the support members in a direction where a tensile force is applied to the strips.

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 is provided with a shadow mask structure which includes a shadow mask formed by integrally forming an apertured portion, an imperforate portion and a skirt portion, and a support frame having a frame portion into which the skirt portion is fitted. The skirt portion of the shadow mask has respective long sides and respective short sides thereof recessed inwardly, and the frame portion has respective long sides and respective short sides formed in planes having no welding bosses, and the skirt portion is fitted into and welded to the frame portion. Furthermore, an end of the outside of the skirt portion and the inner wall of the frame portion have respective entire peripheries thereof come into contact with each other. With such a construction, the shadow mask structure has a small magnetic resistance and the shadow mask is prevented from being vibrated at the time an external vibration is applied to the cathode ray tube.

Abstract: A color cathode ray tube comprising a perforated molded mask curved inward in the middle between its two opposite sides and having round corners, and a support frame curved outward in the middle between its two opposite sides and having round corners, wherein the corners of mask are respectively brought into contact with the corners of the mask and the frame. Therefore, the alignment accuracy between a shadow mask assembly and phosphor film and the magnetic shielding of the color cathode ray tube can be improved.

Abstract: Structure for fastening a flat Braun tube to a cabinet, which can prevent damage to a panel and reduce assembly working-hours, including a holding member for fastening to a portion of an outer circumference of the panel, and a lug fitted to the holding member for fastening to the cabinet.

Abstract: A flat cathode ray tube is provided. The flat cathode ray tube includes a shadow mask having a plurality of electron beam holes, a shadow mask frame having multiple-layered support members continuously connected, for supporting the shadow mask, and an inner shield connected to the shadow mask frame. The support member for supporting a shadow mask is solidified by forming multiple-layer laminates. Also, mobility is provided to the longer sides of the shadow mask, thereby easily applying a tension to the shadow mask.

Abstract: A stretched mask having a high tensile strength and favorable high-temperature creep properties and free from tape twist, and a material for the stretched mask. A low-carbon steel sheet containing 70 ppm to 170 ppm of nitrogen on a weight basis is heat-treated at a temperature at which recrystallization does not take place. The heat-treated material is provided with a resist pattern for forming apertures and subjected to etching to form apertures.

Abstract: The CRT has a tensioned shadow mask with between 160-180 or between 210 and 240 slits per row and display devices having such CRT's. The first embodiment is in particular suited for CRT''s having a screen size larger than 21″ and for TVT applications, giving a substantially Moire free image for an NTSC, PAL and VGA signal, the second embodiment is in particular suited for CRT's having a screen size of 23″ or smaller and for CMT applications, giving a substantially Moire free image for a SVGA and XGA signal.

Abstract: A color picture tube includes an evacuated envelope having a rectangular faceplate panel with two approximately parallel long sides, two approximately parallel short sides and four corners. The panel comprises a faceplate and a peripheral sidewall, and includes a shadow mask-frame assembly mounted therein by springs located at the four corners of the panel. The springs have apertures engaging studs that are located on the peripheral sidewall at the four corners. The panel includes additional studs on the peripheral sidewall located near the centers of at least one pair of approximately parallel sides of the panel. Brackets are located on opposite sides of the shadow mask-frame assembly at the locations of the additional studs. The brackets include slots therein. The slots are open on sides thereof facing the faceplate. The additional studs are positioned within the slots.

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

Abstract: A color cathode ray tube comprises (i) a glass bulb comprising a substantially rectangular panel, on which phosphors of a plurality of colors are arranged, a funnel that is connected to a rear side of the panel, and a neck portion formed at a rear side of the funnel, in which an in-line electron gun for emitting an electron beam is arranged; (ii) a substantially rectangular shadow mask having a plurality of apertures that are arranged in correspondence with the phosphors on the panel; and (iii) a substantially rectangular mask frame having a wall portion that supports opposing skirt portions of the shadow mask. The surface of the shadow mask with the apertures is convex towards the panel. A central portion of the opposing skirt portion is convex in a direction of the tube axis on the side of the electron gun. Processing warps such as wrinkles in the skirt portions of the shadow mask are avoided, and a color cathode ray tube with good color rendition is obtained.