Abstract: A vacuum envelope of a cathode ray tube comprises a faceplate and a rear envelope bonded to the faceplate. The rear envelope includes a rear plate opposed to the faceplate, a side wall, a plurality of funnels extending from the rear plate, partition walls set up on the rear plate, and necks bonded individually to the funnels. The rear envelope is formed by connecting a plurality of miniature envelopes to one another. Each miniature envelope includes at least one funnel, and is molded by pressing.

Abstract: A mask assembly for a cathode ray tube includes a shadow mask for permitting electron beam to strike phosphor elements associated with the beam, a frame for supporting the shadow mask, and an electron beam interceptor which selectively passes electron beam and is mounted on the frame and between the shadow mask and an electron gun of the cathode ray tube. The electron beam interceptor is a metal sheet and includes a blocking mask on which a plurality of apertures are formed at the positions which correspond to the apertures of the shadow mask, and one or more supporter whose ends are adhered at the frame and the blocking mask to support the blocking mask in a funnel of the CRT.

Abstract: A glass panel for an implosion-protected type cathode ray tube is provided with a compressive stress of 7 MPa-30 MPa in an outer surface of a face portion and a relation of Rb≧0.017D+4.0 between the radius of curvature Rb of an outer surface of a blend R portion 9 in a diagonal portion of the glass panel and the largest outer diameter D of the glass panel Further, when the face portion is substantially flat, there is a relation of Tr≦0.014D+11.0 wherein Tr is the largest wall thickness of the blend R portion.

Abstract: A shadow mask in a color CRT, of an Fe—Ni series invar alloy of which alloy composition, crystal grain size, and concentration of {100} crystal planes are adjusted so as to have an excellent etchability and formability, for forming uniform electron beam pass-through holes with a less etching deviation and better roundness by etching; and method for fabricating the same, the shadow mask consisting essentially of 35˜38% Ni, 0.1˜1.0% Mn, 0.05˜0.5% Cr, 0.05˜0.01% B, below 0.02% C, 0.001˜8.0% Co, 0.001˜0.01% N, below 0.008% O, below 0.

Abstract: A color cathode ray tube includes a magnetic shield of generally truncated pyramidal shape housed in its funnel portion and an electron beam deflection device. The magnetic shield is configured such that a magnetic shield-core distance between an end of a magnetic core of the deflection device facing toward the phosphor screen and an end of the magnetic shield facing toward the electron gun is approximately constant for section plane angles &thgr; in a range of 0° to 360°, the magnetic shield-core distance being measured in a section plane containing a longitudinal axis of the cathode ray tube and being inclined at the section plane angle &thgr; with respect to a horizontal scanning direction of the electron beams.

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 cathode-ray tube having a flat face including a panel having a flat screen surface and provided with a support portion at the inner surfaces of a skirt portion at the periphery thereof, a frame supported by the support portion of the panel, a flat tension mask fixed to the frame in a tensioned state, and a funnel joined to the panel for end thereof to support the frame.

Abstract: A color picture tube has a tensioned mask supported by a support frame mounted within the tube. The mask has a significantly lower coefficient of thermal expansion than the frame. The mask has an active apertured portion formed by a plurality of parallel vertically extending strands, through which electron beams pass during operation of the tube, and two opposite side border portions outside the active apertured portion. The two opposite side border portions have tie bars that extend between the vertical strands of the mask. The tie bars accommodate expansion of the frame, while substantially maintaining the positions of the vertical strands in the active portion of the mask.

Abstract: In order to prevent doming effect in a shadow mask of a color cathode ray tube caused by thermal expansion of the shadow mask structure produced by heating of the shadow mask due to impingement of the electron beam thereon, the shadow mask is provided with a skirt portion along at least one side thereof. The skirt portion includes a long projection portion where the shadow mask is welded to the frame, an adjacent inclined portion which decreases in length in a direction away from the projection portion. Further, a short portion is disposed therebetween the inclined portion. The inclined portion decreases in length linearly or non-linearly.

Abstract: A shadow mask of a color cathode-ray tube includes a substantially rectangular mask main body and a rectangular mask frame attached an outer periphery of the mask main body. The mask main body has a substantially rectangular main surface portion formed of a curved face having a large number of electron beam passage apertures, the main surface portion having a longer axis and a shorter axis perpendicular to the longer axis, and a skirt portion raised in peripheral edges of the main surface portion. The skirt portion has a pair of longer side walls extending substantially in parallel to the longer axis, and a pair of shorter side walls extending substantially in parallel to the shorter axis. Each of the longer side walls includes a pressing portion located near the shorter axis so as to protrude toward the mask frame and pressing the mask frame.

Abstract: A shadow mask is provided in an envelope of a color cathode ray tube. The shadow mask includes a mask body having a number of electron beam apertures, and a mask frame having side walls equipped on the peripheral portion of the mask body. The side walls of the mask frame includes a pair of long side walls extending in parallel with the long axis X and a pair of short side walls extending in parallel with the short axis Y. Beads and are respectively formed on the long side walls and the short side walls. The length of each bead of the long side wall along the long axis is set in a range of 55% to 80% of the length of the long side walls along the long axis, and a width of the bead in the tube axis direction is set in a rage of 40% to 75% of the maximum width of the long side walls in the tube axis direction.

Abstract: The present invention relates to a cathode ray tube having an inner magnetic shield and to a method for fixing the inner magnetic shield. The inner magnetic shield is fixed to a frame supporting a shadow mask simply with fixing members. First engagement holes are provided on each side of a first flange portion of the frame, and second engagement holes are provided on each side of a second flange portion of the inner magnetic shield. Each side of the second engagement hole is provided with a folding portion. The fixing member is inserted so as to put into the first engagement hole and the second engagement hole facing the first engagement hole from the side of the inner magnetic shield.

Abstract: In a color cathode ray tube comprising a panel with a substantially rectangular effective portion whose outside face is almost flat or slightly curved and whose inside face has a curvature in the direction of minor axis near the short sides of the portion, and a fluorescent substance screen having a substantially rectangular effective region formed on the inside face of the effective portion of the panel, the short sides in the outer circumference of the effective region of the fluorescent substance screen are projected toward the center of the effective region. This improves the flatness of images appearing on the fluorescent substance screen provided on the inside face of the effective portion in the color cathode ray tube with the outside face of the effective portion of the substantially rectangular panel being almost flat and the inside face having a curvature in the direction of minor axis at least near the short sides.

Abstract: Electron beam passage hole arrays are arrayed on an effective surface of a shadow mask along the Y-axis direction in accordance with a predetermined quartic polynomial. The X-axis direction size of each of electron beam passage holes constituting the electron beam passage hole array is defined on the basis of the quartic polynomial such that the ratio of the hole size to the interval between electron beam passage hole arrays adjacent to each other becomes constant.

Abstract: A spring used in a CRT interconnects a stud pin embedded into a CRT panel and a mask frame mounting a shadow mask thereon so that the spring removably mounts the shadow mask within the CRT panel. In order to minimize or interrupt a vibration energy transmitted to the shadow mask, the spring is formed with a composite metal plate having a laminated structure of more than two materials capable of converting the vibration energy applied thereto into a thermal energy by an internal or interfacial friction. The composite metal plate is preferably composed of a first steel, a zinc alloy, and a second steel. A method of making the spring includes the steps of plating two or more metallic materials in sequence, rolling the plated metallic materials into an integrated composite metal plate, and forming the composite metal plate into a spring shape.

Abstract: This invention intends to provide an aperture grill supporting frame whereby forces exerted by damper wires on individual thin tapes constituting an aperture grill are uniform. This object is achieved by the following: the surfaces for welding of upper and lower frames of an aperture grill supporting frame are so processed from the beginning as to have sizes compensatory for deformations occurring as a result of pressurization and thus they will form a part of a columnar wall surface with a radius of R when they subject to deformations in the presence of a pressure. Thus, the surfaces for welding at both ends, for example, take a slightly bulged form as compared with a sector of a radius of R before they are subject to welding.

Abstract: A high thermal expansion member consisting substantially of Fe—Ni—Cr based alloy, a low thermal expansion member consisting substantially of an Fe—Ni based alloy, and an intermediary member, which comprises one kind of metal selected from Fe, Al and Cu or an alloy comprising these metals, possesses a thermal expansion coefficient &agr;3 which has a value between those of the high thermal expansion member (thermal expansion coefficient &agr;1) and the low thermal expansion member (thermal expansion coefficient &agr;2) (&agr;1>&agr;3>&agr;2), and is interposed therebetween, are laminated to form a thermal deformation member for an electron tube or a thermal deformation member for electric control. The intermediary member, without adversely affecting strength or long term reliability of the thermal deformation member, contributes to manufacturing cost reductions and improvement of workability.

Abstract: A cathode-ray tube has an internal magnetic shield and at least one contact spring attached to the shield. The shield includes a land with an outer edge and an inner edge. The spring includes two portions, an improved clasp portion attached to the shield at the land, and a contact leaf portion. The improved clasp portion includes a flat body with a reverse bend hook at a first end, and a latch and a catch at an end opposite to the first end. The hook engages the outer edge of the land, and the latch engages the inner edge of the land. The catch includes a bent end portion that forms an acute angle with the remainder of the catch. The bent end portion is positioned to engage the inner edge of the land if the spring is rotated about the hook. The leaf portion is connected to and extends from the latch.

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 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 shadow mask for a cathode ray tube includes through-holes defined by first and second recessed formed at first and second surfaces of the shadow mask, respectively. Each through-hole has a first wall farther away from a center of the shadow mask than a second wall thereof. The second recess has a smaller size than that of the first recess. The first wall is formed of a first wall portion defined by an inner surface of the first recess and a second wall portion defined by an inner surface of the second recess. The second wall portion of through-holes located at a peripheral region of the first region has a configuration such that electron beams reflected therefrom are directed to an inner surface of the first recess to thereby reduce electron beams reflected therefrom in directions different from a direction in which the electron beams are originally directed before the electron beams enter the shadow mask.

Abstract: The present invention has an object to provide a method of manufacturing an electronic tube capable of eliminating deterioration of image quality due to an excessively high electron reflection effect of a material comprising a metal element with an atomic number not lower than 70 and painted on a shadow mask and deterioration of image quality due to spontaneous peeling of a coat on the surface of the shadow mask. A paint mainly comprising a solated metal oxide or a metal alkoxide of an element with an atomic number not lower than 40 is painted to form an electron reflection coat with an amount of coating of less than 2 mg/cm2 so as to achieve coating on an electron gun side surface of a shadow mask.

Abstract: A process and a device for the joining of fastening elements on a mask frame of picture tubes by welding using laser beams is applicable to the production of color picture tubes for television sets and computer monitors. After positioning the fastening elements, the elements are welded by laser beams from at least one laser source. The laser source is located outside the mask frame, and the laser beam is guided through a glass wall of a screen to weld the fastening elements.

Abstract: In order to prevent doming effect in a shadow mask of a color cathode ray tube caused by thermal expansion of the shadow mask structure produced by heating of the shadow mask due to impingement of the electron beam thereon, the skirt portion of the shadow mask is provided, along at least one side thereof, with a long projection portion where the shadow mask is welded to the frame, an adjacent inclined portion which decreases in length toward the corner of the shadow mask and a short portion disposed therebetween the inclined portion and the corner. The inclined portion may decrease in length linearly or non-linearly.

Abstract: A color cathode ray tube (CRT) employs a color selection electrode in the form of a thin shadow mask located adjacent the CRT's display screen and having an array of electron beam passing apertures arranged in vertical columns and horizontal rows. To correct for electron beam landing tilt of three inline electron beams on the CRT's display screen arising from the spherical shape of the CRT's shadow mask and display screen, the shadow mask is provided with a two-step function defining the vertical pitch (P.sub.v) of its apertures, or the vertical spacing between adjacent apertures not in the same vertical column. A first quadratic equation is used for defining the vertical pitch of the shadow mask's beam passing apertures covering a first generally flat inner area of the CRT's display screen from the center of the display screen out to where its radius of curvature substantially decreases adjacent its periphery.

Abstract: An apertured shadow mask in a color cathode ray tube (CRT) serves as a color selection electrode in permitting each of the three electron beams to be incident only upon its associated color-producing phosphor elements on the CRT's display screen. The apertures are arranged in vertical columns and horizontal rows in the shadow mask with aperture spacing defined by a vertical pitch (P.sub.v) i.e., the vertical spacing between adjacent apertures within the same vertical column where the apertures in one row are in different columns than the apertures in adjacent rows, and a horizontal pitch (P.sub.h), i.e., the horizontal spacing between adjacent apertures in the same horizontal row. To increase the color purity adjustment margin particularly in the corners of the display screen while still maintaining sufficient vertical spacing between adjacent phosphor dot color trios for a high degree of video image resolution, P.sub.

Abstract: A cathode-ray tube has an internal magnetic shield and at least one contact spring attached to the shield. The shield includes a land with an outer edge and an inner edge. The spring includes two portions, a clasp portion attached to the shield at the land, and a contact leaf portion. The clasp portion includes a flat body with a reverse bend hook at a first end, and a latch at an end opposite to the first end. The hook engages the outer edge of the land, and the latch engages the inner edge of the land. The leaf portion is connected to and extends from the latch.

Abstract: A shadow mask for a color picture tube a thermal includes insulating layer preventing heat transfer to an apertured shadow mask. The side of the mask directed toward the cathode of the color picture tube is coated with a heat-insulating layer including particles having a porous structure. The pores may contain heavy metals or heavy metal compounds so that electron reflection and absorption occurs directly within the layer. The resulting heat is transferred to the interior of the picture tube instead of to the mask.

Abstract: A holder for maintaining an apertured shadow mask in fixed relation to the display screen of a color cathode ray tube (CRT) includes the combination of a mounting stud attached to an inner portion of the CRT's glass envelope and an apertured resilient metal holder attached to the shadow mask's peripheral frame and adapted to receive the mounting stud in a tight-fitting manner. A plurality of such mounting stud/metal holder combinations securely attach the top, bottom and lateral edges of the shadow mask frame to adjacent inner portions of the CRT's glass envelope adjacent its display screen. Heating of the shadow mask caused by the CRT's electron beams incident thereon gives rise to heating and thermal expansion of the shadow mask metal holders.

Abstract: A shadow mask for a flat CRT includes: an effective face in a central region having apertures through which electron beams emitted from an electron gun pass; a rail fixed to the mask, extending around the effective face; and ineffective faces outside the rail where mask holes are formed; wherein at least some of the mask holes formed in the ineffective faces of the mask are shaped as substantially circular dots, and decrease in diameter from the central region toward the outside of edges of the mask.

Abstract: An object is to remove unnaturalness of the picture caused by inferior flatness of the apparent screen and provide a safety-designed color picture tube device having a flatter apparent screen without deterioration of static strength of the picture tube. The upper half of the panel (the part above the Z-axis) shows the vertical-axis (V) section and the lower half (the part below the Z-axis) shows the horizontal-axis (H) section. The outside surface of the panel is in a convex form with respect to the Z-axis in the vertical-axis (V) section with a radius of curvature of ROV and is in a convex form with respect to the Z-axis in the horizontal-axis (H) section with a radius of curvature of ROH. The inside surface of the panel is in an almost linear form in the vertical-axis (V) section with a radius of curvature of RIV and is in a convex form with respect to the Z-axis in the horizontal-axis (H) section with a radius of curvature of RIH.

Abstract: An arrangement for mounting a shadow mask, or color selection electrode, in the glass envelope of a color cathode ray tube (CRT) includes four resilient metal holders, each spot welded to a respective upper, lower or lateral portion of the shadow mask's skirt. Each holder is formed from a unitary metal strip which is shaped so as to include an inner mounting portion spot welded to the mask's skirt and an outer apertured portion adapted to receive a stud attached to and extending inwardly from the CRT's glass envelope. The shadow mask undergoes thermal deformation, or doming, when heated by electron beams incident thereon and transfers heat to each of the metallic holders. Each of the metallic holders, in turn, undergoes thermal deformation, but because of the shape and orientation of the holders relative to the shadow mask, the four holders deflect the shadow mask in a direction generally perpendicular to and outward from the CRT's glass display screen, i.e., along the CRT's Z-axis.

Abstract: Provided with a shadow mask which is designed to suppress the doming effect by providing a shadow mask plate material for a color CRT having an ideal texture suitable for an etching to form the uniform profile of holes for the electron beams to pass through and thereby to prevent the etching deviation, the shadow mask plate material consisting of as main component Fe--Ni alloy, thus the shadow mask being characterized by the volume ratio of crystals with CUBE orientation being 2 to 20 times as high as that of crystals with (.beta.)-Fiber in the shadow mask plate material for the enhancement of etching property; and the method of manufacturing the shadow mask including the steps of hot-rolling and cold-rolling, thermal-refining and heat-treating the shadow mask raw material to obtain a shadow mask thin plate having the volume ratio of crystals with CUBE orientation being 2 to 20 times as high as that of crystals with (.beta.)-Fiber; and etching, forming and blackening the resulting shadow mask thin plate.

Abstract: Provided are a high strength cold rolled steel sheet and a high strength plated steel sheet possessing improved geomagnetic shielding properties, that is, having a high relative permeability in a d.c. magnetic field around 0.3 Oe, a process for producing the same, and an explosion-proof band or an outer magnetic shielding material, for television cathode-ray tubes, using the steel sheet. An ultra low carbon steel, which has a carbon content of not more than 0.0060% and has been subjected to solid solution strengthening utilizing silicon and magnesium without relying upon precipitation strengthening, is deoxidized with silicon so that aluminum is substantially absent in the steel. Alternatively, when the ultra low carbon steel is deoxidized with aluminum, boron is added to inhibit the precipitation of AlN. Next, the deoxidized steel is finish rolled at 750 to 980.degree. C., cold rolled with a reduction ratio of 60 to 90%, and then annealed in the temperature range of 750.degree. C. to the Ac.sub.

Abstract: Device (8) for suspending the shadow mask (1) of a cathode ray display tube, of the type comprising a thermostatic bimetal (10) whose deflection between 60.degree. C. and 130.degree. C. is less than the deflection between 20.degree. C. and 60.degree. C. Bimetal whose deflection between 60.degree. C. and 130.degree. C. is less than its deflection between 20.degree. C. and 60.degree. C.

Abstract: A color cathode ray tube is provided with a saddle-shaped shadow mask.As a result, the sensitivity to doming and microphonics of the mask is improved. This is advantageous, in particular, for a cathode ray tube having a very flat display window. Preferably, the display device in which the cathode ray tube is employed is provided with two dynamic quadrupoles, for example, in front of the electron gun and in front of a deflection unit.

Abstract: An aperture grill for a color cathode ray tube includes a mask having a plurality of slits, a frame for securing the mask in a taut state, and a vibration suppressing unit for suppressing the vibration of the mask. The vibration suppressing unit comprises a plurality of damping wires having ends fixed on opposing sides of the frame and stretched over the mask in a lengthwise direction, and a plurality of protrusions extending from the damping wires and spaced apart from each other a predetermined distance. The protrusions make contact with or are welded to slit formation elements of the mask, or are partly inserted into the slits and contact lateral sides of the neighboring slit formation elements to suppress vibration of the slit formation elements.

Abstract: A color cathode ray tube includes a generally rectangular shadow mask having a curved apertured portion having a multiplicity of electron-transmissive apertures, a curved imperforate portion surrounding and integral with the apertured portion and a skirt portion bent back from a periphery of the curved imperforate portion, and a generally rectangular support frame for suspending the shadow mask by spot welding the skirt portion thereto, within a panel portion of the color cathode ray tube. The skirt portion is provided with a plurality of slits extending in a direction of a height of the skirt portion and a plurality of embossments extending in the direction of the height of the skirt portion, and the slits and the embossments are juxtaposed around a circumference of the skirt portion.

Abstract: A color cathode ray tube comprises a vacuum envelope in which there is mounted a shadow mask having a curved surface having a plurality of electron beam passing holes and a skirt extending downward from the margin of the curved surface. The shadow mask is supported by a mask frame having a substantially rectangular side wall. A shadow mask assembly constituted by fitting and securing the skirt into the side wall is set in the panel of the envelope, and the skirt is fitted and secured into the side wall by curving the middles of two or four facing sides of the skirt inward. Thereby, it is possible to provide a color cathode ray tube having the shadow mask assembly capable of obtaining a superior magnetic shielding characteristic by enlarging the effective region of the curved surface of the shadow mask.

Abstract: A panel assembly for a cathode ray tube includes a panel having an inner phosphor screen and a side-wall, and a shadow mask having a plurality of beam-guide apertures. The shadow mask is placed behind the phosphor screen at a predetermined distance. A shadow mask frame is attached under the shadow mask to suspend it in the panel. The panel assembly further includes a plurality of stud pins embedded into the side-wall of the panel, a spring positioned between the shadow mask frame and the stud pins to interconnect them, and a vibration damping member for damping vibration of the shadow mask by converting mechanical stress applied to the shadow mask into electrical energy. The vibration damping member is formed with piezoelectric material layers provided on at least one of an outer periphery of the stud pin and between the spring and mask frame.

Abstract: A stress reduction shadow mask of the present invention distributes the tension evenly across the entire surface so that a greater force may be applied to stretch the mask. The shadow mask comprises an effective face area constituting a central portion of the shadow mask. The effective face area has electron beam apertures, which electrons pass through. A secondary ineffective face area surrounds the effective face area and also has apertures. A frame attaching border further surrounds the secondary ineffective face area, and a primary ineffective face area at least partially surrounds the frame attaching border. Corners of the shadow are adjacent the primary ineffective face area and do not have apertures. Portions of the primary and/or secondary ineffective areas are treated with tie bar grading and/or have round corners. The mask is stretched under tension and attached to the frame at the frame attaching border while under tension.

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, B.sub.2 O.sub.3, Bi.sub.2 O.sub.3 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 cathode-ray tube including: a flat panel with an inside to which fluorescent material of Red, Green and Blue is applied; a funnel combined to a rear end of the flat panel; an electron gun provided in a neck part of the funnel and radiating electron beam; a flat tension shadow mask installed to the inside of the flat panel at regular intervals and having a plurality of passing holes formed for the passage of electron beams; a rail supporting the flat tension shadow mask for regularly maintaining interval of the tension shadow mask and a surface of the panel; and a magnetic shield shielding an external magnetic field, where the rail has a magnetic shield connecting part for installing the magnetic shield within the cathode-ray tube.

Abstract: In an exposure method for a picture tube, photoresists which are applied on an inner surface of a panel are exposed through a shadow mask to fix the photoresists on the inner surface of the pane. A position where light, which is emitted by an exposure light source and passes through an outermost slot of the shadow mask, becomes directly incident on the inner surface of the panel, and a position where light, which is emitted by an exposure light source at the same position as that of the first exposure light source or at a different position from that of the first exposure light source, passes through a slot inside the outermost slot of the shadow mask, is reflected by an outer surface of the panel, and returns, becomes incident on the inner surface of the panel are set to coincide with each other. An exposure apparatus for achieving this method is also disclosed.

Abstract: An improved color picture tube has a tensioned mask and support frame assembly. Each of the mask and the support frame is rectangular and has two long sides that parallel a central major axis thereof and two short sides that parallel a central minor axis thereof. The improvement comprises the frame including two first members, paralleling the major axis, and two second members, attached to the ends of said first members, paralleling the minor axis. Each of the second members includes a pinched section that elongates it.

Abstract: In a shadow mask employed as a color selection electrode in a multi-electron beam color cathode ray tube (CRT), the surface area of the mask is reduced by increasing the length of the individual elongated beam passing apertures, or slots, while reducing the ratio of the width of the bridge portion of the mask between adjacent apertures to the length of the aperture. Increasing the length of the apertures while reducing the ratio of bridge width to aperture length reduces the surface area of the mask upon which energetic electrons are incident resulting in a corresponding reduction in thermal deformation, or doming, of the shadow mask. Reduction in shadow mask doming results in reduced landing shift of the electron beams incident on phosphor elements disposed on the inner surface of the CRT's display screen for improved video image brightness and color purity. More specifically, in a shadow mask having a thickness in the range of 0.12-0.

Abstract: A high thermal expansion member consisting of such as an Fe--Ni--Cr based alloy, a low thermal expansion member consisting of such as an Fe--Ni based alloy, and an intermediary member, which comprises one kind of metal selected from Fe, Al and Cu or an alloy comprising these metals, possesses a thermal expansion coefficient .alpha..sub.3 which is located between those of the high thermal expansion member (thermal expansion coefficient .alpha..sub.1) and the low thermal expansion member (thermal expansion coefficient .alpha..sub.2) (.alpha..sub.1 >.alpha..sub.3 >.alpha..sub.2), and is interposed therebetween, are laminated to form a thermal deformation member for an electron tube or a thermal deformation member for electric control. The intermediary member, without adversely affecting strength or long term reliability of the thermal deformation member, contributes to manufacturing cost reduction and improvement of workability.

Abstract: In a in-line plural beam color cathode ray tube, the phosphor screen is configured such that a horizontal phosphor dot pitch Ph is nearly uniform in a first region within a first predetermined distance from the vertical center line toward sides of the useful area and increases gradually with increasing distance from the vertical center line toward the sides of the useful area outside of the first region; and a vertical phosphor dot pitch Pv decreases gradually with increasing distance from the vertical center line toward the sides of the useful area outside of the second region, where Pv is a vertical distance between a first horizontal row of the phosphor dots and a second horizontal row of the phosphor dots and adjacent to the first horizontal row, and Ph is a horizontal distance between a first phosphor dot of a first color in the first horizontal row and a second phosphor dot of the first color in the second horizontal row and nearest the first phosphor dot.

Abstract: A shadow mask frame assembly for a color cathode ray tube including a plate shaped shadow mask (60) including electron beam passing holes (H) and having a curvature, and a frame (70) having a side wall (73), a flange (72) inwardly extending from the side wall (73), and a supporting portion (71) extending from the flange (72) as a step, wherein some peripheral edges (61) of the shadow mask (60) are attached to the supporting portion (71) and some peripheral edges (61) of the shadow mask (60) are not attached to the supporting portion (71) and slip on an upper surface of the supporting portion (71) during thermal expansion of the shadow mask (60). The present shadow mask frame assembly can be easily fabricated and assembled by eliminating the skirt portion, and can effectively compensate for thermal expansion of the mask plate.

Abstract: Method for fabricating an inner shield for use in a color cathode ray tube, is disclosed, for preventing degradation of a color finesse of the color cathode ray tube, the method including the steps of drawing or forming a piece of thin sheet of aluminum killed steel to form an inner shield of required form, annealing the inner shield in a reducing atmosphere at a temperature above a recrystallization temperature of the aluminum killed steel for improving a non-uniform magnetic distribution thereof, and coating black ironoxide film on a surface of the annealed inner shield.

Abstract: There is provided a shadow mask for a cathode ray tube, including a plate having a first surface and a second surface. The plate is formed with at least one line of slots between which bridge portions are formed, each slot being spaced away from adjacent slots by a predetermined pitch P. The bridge portions are defined by a first length at the first surface of the plate and a second length at the second surface of the plate, the first and second lengths being determined so that a factor R is in the range of 5% to 15%, wherein the factor R is defined as a ratio of the smaller of the first and second lengths, to the predetermined pitch P. By setting the factor R in the range of 5% to 15%, it is possible to enhance the mechanical strength of the shadow mask without deterioration of brightness characteristic of the shadow mask.