Abstract: A color selection mechanism of a cathode-ray tube is formed in such a manner that a large number of strip-shaped grid elements are stretched across a frame which has a pair of opposed support members and a pair of elastically-providing members fixed between the support members. In this color selection mechanism, the geometrical moment of inertia of each of the support members can be changed stepwise from a central part of each of the support members to each of end parts thereof by changing a ratio of a longitudinal dimension to a lateral dimension of an L-shaped section of each of the pair of support members stepwise. As a result, it becomes possible to increase the rigidity at the central part of the frame of the color selection mechanism and thereby improve the performance of the color selection mechanism of the cathode-ray tube.

Abstract: A flat tension mask frame assembly is provided, including a frame and a tension mask. The frame has first and second support members which are separated from each other by a predetermined distance, and have fixing portions and flange portions which are bent inwardly from the fixing portions and become narrower from the center portion to both ends of the flange portions, and at least two elastic members fixed at both ends to the first and second support members for supporting the support members. The tension mask has facing edges which are fixed to the fixing portions of each of the first and second support members in a state where a tensile stress has been applied to the facing edges.

Abstract: A shadow mask comprises a frame member, a mask body formed in a plate shape as a grid element and mounted to the frame member and a plurality of slits formed to the mask body. The mask body is composed of an iron-based alloy containing 31.0-38.0 weight % of nickel and 1.0-6.5 weight % of cobalt and the iron-based alloy contains 0.01-0.10 weight % of carbon.

Abstract: Color cathode-ray tube comprising a color selection mask (16) held under tension between a first pair of opposed long sides (30) of an approximately rectangular metal frame (21), a main magnetic screen (22) placed at the rear of the frame in the funnel-shaped part (11) of the tube's envelope, and additional means (50) for forming a screen against the Earth's magnetic field in the part lying along the second pair of opposed short sides of the frame.

Abstract: A tension mask frame assembly for a color cathode ray tube, including: a tension mask having a plurality of strips on which slots are formed being separated 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 a tensile force is applied to the tension mask, and the vertical pitch of the real bridges becomes smaller in a direction from the center portion of the tension mask to the peripheral portion of the tension mask.

Abstract: A shadow mask includes a substantially rectangular effective region formed having a number of electron beam passage apertures and opposed to a phosphor screen and a substantially rectangular skirt portion provided around the effective region and extending in the direction of a tube axis. The skirt portion has a pair of long sides extending substantially parallel to a major axis and a pair of short sides extending substantially parallel to a minor axis, the long and short sides being welded to the inner surface of a substantially rectangular mask frame. A distance a from an extending end of the skirt portion on each long side to the weld spot is longer than a distance b from an extending end of the skirt portion on each short side to the weld spot.

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

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 31FL, 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: A color selection apparatus for a cathode ray tube includes a mask bearing a shape with short and long axes, and a frame combined with the mask. The mask is fitted to the frame while being tensioned either in the long axis direction or in the short axis direction. The mask has a plurality of strips spaced apart from each other by a predetermined distance, a plurality of real bridges disposed between the neighboring strips with a predetermined pitch while defining beam-guide holes, and one or more dummy bridges placed within each beam-guide hole while being extended from the strips in at least one direction. In any one reference column of m=0 and the other neighboring columns of m±n (n is a natural number), the real bridges arranged at the reference column are placed at lines different from the real bridges arranged at the columns of at least m±2 in the long axis direction.

Abstract: A color cathode-ray tube includes a shadow mask (20) stretched and held with tension applied thereto in one direction. The shadow mask is made of an Invar material. A stress generated in the shadow mask by the tension is 32 MPa or more in a range of ±20 mm with respect to a center position of the shadow mask in a direction orthogonal to a direction in which the tension is applied, and is 26 MPa or more outside the range. By stretching the shadow mask under this stress condition, magnetic shield characteristics are enhanced, and mislanding of an electron beam can be reduced. As a result, a satisfactory color image display can be obtained.

Abstract: A color cathode-ray tube is provided for easily detaching a mask assembly when manufacturing a phosphor screen by expanding the gap (Q-value) between the shadow mask and a phosphor screen by a number times while maintaing the resolution degree. The cathode-ray tube includes a phosphor screen formed on the inner surface of a panel and repeatedly forms a plurality of red, green and blue phosphor stripes, an electron gun emitting three electron beams toward the phosphor screen, and a shadow mask arranged in front of the phosphor screen facing the electron gun and forming a plurality of beam passage apertures for separating the electron beams.

Abstract: An Fe-Ni alloy having improved softening property is provided consisting of from 34 to 38% of Ni, not more than 0.5% of Mn, from 0 to 0.02% of soluble Al, from 0.005 to 0.0100% of N, the balance being Fe and unavoidable impurities. A smaller of the first value, which is the content of the soluble Al content divided by 27, or a second value, which is the nitrogen content divided by 14, is not more than 0.00015. When the first value and the second value are the same, the soluble Al content is from 0 to 0.01%.

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 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 said tube, and expands substantially the same per unit length as said frame in the higher thermal cycling temperature range used during tube processing.

Abstract: A microphonic damper clip for mounting to the border of a tension mask. The damper clip is formed of two halves with each half having a first leg and an integral second leg. The free end of one of the legs from each of the two halves of the damper clip are inserted into an aperture disposed on the border of the tension mask. At least one free end of each corresponding leg is then attached to one another to form a damper clip.

Abstract: The present invention describes the details of a flat mask before tension is applied, an assembling method of that flat mask, and a tension mask assembly manufactured by using that method in order to obtain satisfactory thermal expansion, uniform stress distribution and linearity. The flat mask includes an apertured portion and supporting ends surrounding the apertured portion. The apertured portion comprises a plurality of concave pin-cushion type or convex barrel type strips, a plurality of real bridges connecting strips and dividing slots, and dummy bridges formed in the slots. The short supporting ends have the same width along a longitudinal direction and are formed to have the same curvature as the strips facing the supporting ends. The short supporting ends are preferably half-etched in order to make the volume of material removed from the short supporting ends greater than the volume of material removed from the apertured portion.

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: It is an object of this invention to provide a shadow mask material for use in a color picture tube excellent in tensile strength and excellent in high temperature creep strength, a shadow mask and a picture tube incorporating the same. For this purpose, the shadow mask material according to this invention uses a low carbon alloy steel sheet containing from 0.05 to 2.5% by weight of Cu and 0.001 to 0.4% by weight of P, or from 0.05 to 2.5% by weight of Cu, from 0.001 to 0.4% by weight of P and from 0.01 to 1.75% by weight of Ni.

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: An apparatus and method for dampening vibration of a television tube in a tension mask. The apparatus include a vibration reducing assembly that is affixed between a mask frame and a busbar assembly of a tensioned mask. The vibration reducing assembly is comprised of a tension coil spring with a pin inserted in the center of the coils. As the busbar assembly or mask is vibrated, the spring pulls and releases, allowing the internal pin to rub against the coils, scrubbing away energy. The busbar assembly and the mask are formed such that their independent resonant frequencies differ greatly from one another.

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 tension mask frame assembly for a color cathode-ray tube includes a frame including first and second support members, and at least a pair of elastic members supporting the first and second support members, both end portions of each of the elastic members are secured to the first and second support members, a tension mask including a plurality of strips and forming slits, a plurality of tie bars disposed between the strips and connecting neighboring strips to divide slits, where longer side portions perpendicular to a lengthwise direction of the strips are secured to the first and second support members, and vibration prevention members having both end portions supported at the first and second support members, having a predetermined tensile force, and being in contact with shorter side portions of the tension mask in a direction parallel to the strips of the tension mask.

Abstract: A vibration attenuator is attached to a shadow mask in a movable condition without being adhered to the shadow mask. The vibration attenuator has depressions, and is attached to the shadow mask by inserting its foot portions through holes provided in the shadow mask, and folding them at the depressions, thereby deforming the vibration attenuator into an approximately rectangular shape. Because a vibration energy of the shadow mask is consumed by friction due to a contacting or sliding of the vibration attenuator with the shadow mask, vibration of the shadow mask can be attenuated effectively with a simple structure.

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 color cathode ray tube has an electron gun, a phosphor screen, and a shadow mask closely spaced from the phosphor screen. The shadow mask has plural strips extending in a direction perpendicular to a horizontal scanning direction of electron beams emitted from the electron gun and plural bridge portions connecting adjacent ones among the plural strips. The shadow mask is formed with an aperture area having plural slot-shaped electron beam apertures therein. The shadow mask is provided with at least one wire held under tension in the extending direction of the plural strips so as to be superposed on a surface of one of the plural strips in the aperture area. The surface of the one of the plural strips is a surface of the one of the plural strips facing the electron gun.

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: The present invention provides a tension mask for a cathode-ray tube. The tension mask has an active aperture portion formed by a plurality of parallel strands extending between cantilevers on opposed sides of a mask support frame. The tension mask further comprises border shields mounted over each end of the frame cantilevers, whereby the strand ends are held to the cantilevers in a predetermined spaced-apart relationship. The border shields on opposing sides of the frame extend toward the active aperture portion of the tension mask and is substantially aligned with the screen matrix of the CRT. The tension mask has a lower coefficient of thermal expansion than that of the mask frame, cantilevers, and border shield.

Abstract: A color cathode-ray tube includes a panel having a fluorescent screen on its inside, a funnel which is coupled to the panel and has a cone portion at which a deflection yoke is installed, an electron gun which is installed in a neck portion of the funnel, and a shadow mask frame assembly which is installed at the inside of the panel and includes a shadow mask and a frame. The shadow mask includes an apertured portion which has a plurality of electron beam passage holes, an imperforate portion which extends from and surrounds a periphery of the apertured portion, and a skirt portion which is bent from a periphery of the imperforate portion and has a plurality of etched portions and embossments that are formed in the skirt portion. The frame is partially welded to the skirt portion of the shadow mask to support the shadow mask.

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 color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating an electron beam is disclosed. The envelope further includes a faceplate panel having a luminescent screen with phosphor lines on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive lines, is located adjacent to an effective picture area of the screen. The spacing between the first conductive lines defines a plurality of slots substantially parallel to the phosphor lines on the screen. Each of the first conductive lines has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive lines are oriented substantially perpendicular to the plurality of first conductive lines and are bonded thereto by the insulating material layer. A cap layer is formed over the plurality of second conductive lines and the insulating material.

Abstract: In a shadow mask color cathode ray tube, its shadow mask is not easily deformed into a concave shape when an impact or a vibration is applied to the shadow mask, so that a good image can be displayed. The electron beam passing holes of the shadow mask are each formed of an upper hole etched from the panel side of the shadow mask and a lower hole etched from the electron-gun side of the shadow mask. In each electron beam passing hole located in the peripheral portion of the shadow mask, the ratio of an upper-side etching quantity to a lower-side etching quantity is controlled to be 1.8 or less. By adjusting the balance in strength relative to compressive stresses between the panel side and the electron-gun side of the shadow mask, it is possible to prevent the shadow mask from being deformed into a concave shape.

Abstract: The invention relates to a tension mask frame for a CRT having a generally rectangular support frame to which a peripheral portion of a tension mask is attached. The support frame has at least a long side and a short side. One side extends along an outer edge of the mask and protrudes inward toward the outer edge of the mask. The short side is attached to the long side to form a closed corner portion between the long side and short side of the support frame. The closed corner portion is used to suspend the mask within a panel portion of the color cathode ray tube.

Abstract: A shadow mask for a Braun tube is composed of an iron-based alloy plate of a low thermal expansion structure containing nickel and cobalt, and the iron-based alloy plate has a crystal grain size of more than 6.0 and less than 9.0 measured by a grain size measuring method prescribed in JIS (Japanese Industrial Standard) G0551, and 0.2% proof stress of more than 240N/mm2 and less than 320N/mm2.

Abstract: Color cathode ray tube including a panel in front portion of the cathode ray tube, and a shadow mask spaced from, and fitted to rear of the panel for selecting a color from electron beams, wherein at least one of an inside surface of the panel and the shadow mask have a curvature structure in which a radius of curvature varies continuously within a fixed ratio range, thereby enhancing a strength and improving howling.

Abstract: A color cathode ray tube comprises a panel which outside surface is flat and inside surface has curvature, and a pressed shadow mask having a curved surface opposed to the panel inside surface. The curved surface of the shadow mask is such that the radius of curvature decreases approximately linearly as the position moves from the center to the periphery. Radii of curvature on the major axis, minor axis, and diagonal axis at positions having the same distance from the shadow mask center do not have large differences. This configuration can increase the mechanical strength of the shadow mask.

Abstract: A tension mask frame assembly for a color cathode-ray tube, including a tension mask, a frame and a vibration prevention unit, is provided. In this tension mask frame assembly, the tension mask has a slotted portion in which a plurality of electron beam passing holes are formed and a non-slotted portion located on the edge of the slotted portion. The frame supports two facing sides of the tension mask to apply a tensile force to the tension mask. The vibration prevention unit includes a damper having first and second attenuation portions that are maintained at a predetermined angle to form an insertion portion into which the edges of the tension mask not supported by the frame are inserted, and a support member for suspending the damper from the edges of the tension mask by passing through the first and second attenuation portions and the edges of the tension mask inserted into the insertion portion formed by the first and second attenuation portions.

Abstract: An apparatus for maintaining tension in a mask frame of a cathode ray tube. The apparatus includes affixing a shadow mask to a pair of triboxes disposed along opposite sides of a mask frame at a predetermined tension. The triboxes are coupled to the mask frame by braces having a different coefficient of thermal expansion than the triboxes so as to compensate for the expansion of the frame during thermal cycling of the cathode ray tube. Consequently, it is possible to maintain the tension force applied to the shadow mask by the mask frame.

Abstract: A structure for preventing howling of a shadow mask in a cathode ray tube. The tube includes a panel having a fluorescent material screen on an inside surface, a shadow mask for selecting a color of electron beams emitted from an electron gun, and frames each fastened to a long side of the shadow mask to support the shadow mask on the panel through connecting members for applying a tension to the shadow mask in a vertical direction. The shadow mask includes an effective surface having holes for selecting the color of the electron beams, non-effective surfaces which form no screen, and howling prevention members bent along short side edges of the non-effective surfaces in a horizontal front-to-back direction. This provides a high quality picture because howling is improved even at edge portions of the shadow mask owing to the enhanced moment of inertia and higher natural frequency of the edge portions of the shadow mask.

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

Abstract: 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; Rxp=(A·W+B)·Rdm(A=−0.217, 1.607<B<2.446) Ryp=(C·W+D)·Rdm(C=−0.074, 0.

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 glass funnel for a cathode ray tube in which the asymmetry in shape of the body portion is relaxed to reduce stress whereby an increase of the weight can be suppressed and the dimension in a direction of the depth can be shortened. A portion of the body portion, contiguous to the yoke portion is protruded outwardly to reduce stress, and a front end of the yoke portion is close to an open end portion of the body portion without increasing the wall thickness of the body portion so that the dimension in a direction of the depth of the glass funnel is reduced to shorter the dimension in a direction of the depth of the 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: The present invention relates to a frame for a color CRT having a square framework includes a plurality of beads for strengthening stiffness of the frame formed on the framework including corner portions in order to prevent distortion of the shadow mask. The beads formed on the corner portions are stepped beads having at least two steps. The present invention is capable of strengthening the stiffness of the frames, and increasing an impact character and a vibration character by improving shapes of the beads on the corner portions where stress is concentrated.

Abstract: A cathode ray tube capable of reducing the doming amount and suppressing the occurrence of moire stripes at the same time with improved effects to suppress the occurrence of moire stripes even more is provided. The protruding portions 28a, 28b are protruding from the ends of the horizontal direction of the aperture to the inside of the aperture 27. With regard to the horizontal cross sections of the protruding portions 28a, 28b, the portions facing each other left and right via the aperture are formed to be asymmetrical to the center line 29 in order to reduce or block the incident electron beam. By forming the protruding portions 28a, 28b, the doming amount can be reduced and the occurrence of moire stripes can be suppressed at the same time. Furthermore, by forming the portions facing each other left and right of the protruding portions asymmetrically, the effects to suppress the occurrence of moire stripes can be improved even more.

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 cathode ray tube comprising a color selection mask made from a material in tension and having a relatively low coefficient of thermal expansion, supported by a frame made from a material having a higher coefficient of thermal expansion. Along at least two sides of the frame are disposed two metal inserts made from a material whose coefficient of thermal expansion is similar to that of the mask. The inserts are secured to the opposed sides of the frame at their middle, and the mask is welded to the inserts. The mechanical problems relating to the differences in expansion of the materials making up the mask and the frame, during the high-temperature tube manufacturing steps, are avoided.

Abstract: A color picture tube includes: a glass panel having a substantially rectangular-frame skirt; a rectangular frame holding a shadow mask; and a support spring elastically supporting the frame inside the skirt and fixed to a first position at inside surface of a long side of the skirt and to a second position at the facing outside surface of the frame. The first and second positions are away in horizontal axis direction perpendicular to tube axis and substantially parallel to the long side. The second position is more away from vertical axis perpendicular to tube axis and horizontal axis than the first position. Materials for the support spring and frame are selected so that, in horizontal axis direction, thermal expansion amount of the support spring between the first and second positions is substantially same as that of the frame between the second position and vertical axis when the tube is operated.

Abstract: A color cathode ray tube has a color selection electrode structure made by stretching and welding a color selection electrode having a plurality of apertures to a frame while applying tension in the minor axis direction. A non-perforated region gradually becomes wider from a center portion to both end portions in the minor axis direction. Thus, sufficient tension is applied in the peripheral portion of the perforated region in the major axis direction of the color selection electrode, so that vibrations do not occur easily and the color selection electrode does not warp. Therefore, a color cathode ray tube with excellent color purity can be obtained.

Abstract: A color cathode-ray tube that can attenuate vibration of an entire shadow mask positively with a simple structure. The color cathode-ray tube includes a frame-shaped mask frame and a shadow mask in which many apertures are formed in a flat plate, the shadow mask being stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction. The amplitude in the end portions of the shadow mask is not less than a certain amount relative to the amplitude in the center portion of the shadow mask, in a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube. Furthermore, by providing vibration attenuators at the end portions of the shadow mask, vibrations at the end portions of the shadow mask are attenuated as the side surfaces of the shadow mask slide on the vibration attenuators. Thus, vibration of the entire shadow mask can be extinguished positively.

Abstract: Structure for supporting a shadow mask in a color cathode ray tube including main frames each extended along a long side having the shadow mask welded thereto directly, subframes each extended along a short side connected to the main frames for supporting the main frame, plate type supporting members each fitted to a position of an outer surface of respective frames, and elastic members having one side coupled to a stud pin on an inside surface of the panel, and the other side fitted to the supporting member, wherein the supporting member of the subframe includes a first and a second flanges opposite to each other extended downward vertically, and a parallel part extended horizontally between the first and second flanges, thereby maintaining a uniformity of welding quality during cathode ray tube fabrication and preventing color distortion during operation of the cathode ray tube.