Abstract: When an outer surface of an effective portion 20 of a panel 20 is substantially spherical, a diagonal axis of the effective portion, a long axial effective diameter, land a short axial effective diameter are Sd, Sh, and Sv, the panel is shaped to satisfy the relationship, Dp/Sd<0.05, V<H<D, 2V<Dp<2H where Dp an amount of drop at an end of the effective diameter of the diagonal axis, H an amount of drop at the end of the effective diameter of the long axis, V an amount of drop at the end of the effective diameter of the short axis, the relationship, Ah/Sh<A/Sv where Ah a distance in the long axial direction of a thicker region on the long axis and Av a distance in the short axial direction of the thicker region on the short axis, wherein, in the thicker region, the panel has a thickness larger than the average thickness Ta of the effective portion, and the relationship between a maximum thickness T max and a minimum T min, (Tmax-Ta)>(Ta-Tmin) or .vertline.T max-Ta.vertline.>.vertline.

Abstract: A backplate structure for a field emission display includes a transparent backplate substrate, a plurality of opaque electrodes, a plurality of field emitters geometrically located in the opaque electrodes, and a focusing electrode. The focusing electrode has an exterior surface with a conductive layer disposed substantially over the exterior surface, and the focusing electrode is electrically isolated from the opaque electrodes. The faceplate structure can further include a plurality of transparent electrodes that are orthogonal to the opaque electrodes.

Abstract: According to the present invention, there is provided a display screen having a black matrix of a multilayer structure including a fine pigment particle layer containing fine pigment particles having an average diameter of 0.005 to 0.2 .mu.m, and a black pigment layer containing black pigment particles having an average particle diameter of 0.2 to 5 .mu.m.

Abstract: A resonant microcavity display, comprising a thin-film resonant microcavity with a phosphor active region is disclosed. The microcavity comprises: a rigid substrate; a front reflector disposed upon the rigid substrate; a phosphor active region disposed upon the front reflector; and a back reflector disposed upon the active region. The display preferentially emits light that propagates along the axis perpendicular to plane of the display, due to its quantum mechanical properties. It exhibits high external efficiency, highly controllable chromaticity, high resolution, highly directional output and highly efficient heat transfer characteristics. For these reasons it provides a suitable display element for projection screen television, high definition television, direct view television, flat panel displays, optical coupling, and other applications.

Abstract: In a color filter substrate including a black matrix and RGB patterns, each of the RGB patterns provided on the black matrix is disposed along a direction oblique to a reference direction of the black matrix which is defined by sides of apertures formed in the black matrix.

Abstract: A computer image display device includes a light transparent glass anode plate (10) spaced from a cathode substrate (12) which has a plurality of microtips (14). Plate (10) has an inside surface (25) which is contoured with an array of prisms (36) having equal sides (58, 59) that converge rearwardly toward apexes (38) of peaks (36). Apexes (38) are covered with light absorbing material (47), then covered at anode comb forming regions (51, 52, 53) with conductive material (48). Different color luminescing phosphors (24a, 24b, 24c) are applied over the respective anode combs (51, 52, 53). Sides (58, 59) direct ambient light toward apexes (38) for absorption by material (47). Light emitted by phosphors (24a, 24b, 24c) is directed by valleys (60) toward outside surface (35) of plate (10).

Abstract: A field emission display comprises a screen (10) divided into a plurality of pixels. Each pixel has a plurality of subpixels (130,140,150) of different phosphor efficacies. A matrix of field emission cathodes (80) is directed towards corresponding pixels of the screen (10). Each cathode has a plurality of arrays (81,82,83) of field emissive tips directed towards corresponding subpixels (130,140,150). The arrays of each cathode (80) comprise different numbers of field emission tips to reduce the effect of the difference in the phosphor efficacies of the corresponding subpixels (130,140,150). This advantageously permits tracking between the primary colour components of a gray scale displayed image to be maintained used the same algorithm to translate into voltages for driving the arrays. Therefore, the Colour Point or White Point of the display can be maintained between extremes of gray scale using the same algorithm.

Abstract: A color filter capable of being uniformly formed without any deformation of a light-permeable anode conductor and prevented from being adversely affected by etching for formation of the anode conductor. A light-permeable anode substrate free of any deformation is uniformly formed thereon with anode conductors, on which color filters are formed of a mixture of a composite oxide pigment and a conductive material so as to cover the anode conductors. The color filters each are formed by arranging a color filter material in a predetermined pattern, followed by calcination. Then, phosphor layers are deposited on the color filters. The phosphor layers are electrically connected through the conductive material of the color filters to the anode conductors. A thickness of the color filters and a particle diameter of the conductive material are determined to be substantially the same, so that the color filters exhibit conductivity only in a direction of thickness.

Abstract: A photocurable resin composition for glass lamination, consisting essentially of a radical polymerizable monomer having at least two repeating units of ethylene oxide in its molecule and a photopolymerization initiator, a cured product of which has a volume resistivity of less than 5.times.10.sup.9 .OMEGA..cm.

Abstract: The present invention enlarges the effective display area of a CRT for projecting while maintaining the strength of the panel necessary to allow for normal usage without breaking. The inside portion of the effective display area inside the rectangular display area is of a predetermined radius, and protrudes inward, extending in all directions. The four corners of the display area are outside of the circular boundary line comprised of the standard thickness Tf. Non-display areas H which are outside the boundary line are flat or protuberant, and have a thickness greater than the standard thickness Tf. Accordingly, with the present invention, the effective display area A2 can be made larger than previous effective display areas A1 in the prior art, which could not extend beyond a border that included the four corners, while maintaining overall the necessary strength.

Abstract: A faceplate for a field emission display includes a substrate defining a faceplate interior side. Pluralities of phosphor pixels are disposed on the faceplate interior side. A black matrix grid is formed of column and row guard bands on the faceplate interior side. At least one wall gripper is formed in a column or row guard band, with the wall gripper adapted to receive a spacer wall and mount it relative to the pluralities of phosphor pixels. The faceplate can include a faceplate fiducial that optically aligns to a corresponding backplate fiducial. A spacer wall is positioned in the wall gripper and mounted relative to a corresponding locator formed on a backplate interior side. The wall gripper includes a receiving trench that is positioned adjacent to a plurality of deformation accommodation gaps.

Abstract: On the outer surface of the glass face panel 2 of a display device, a first layer 5 of an electrically conductive transparent thin film, a second layer 6 of another transparent thin film consisting essentially of silicon dioxide (SiO.sub.2) or magnesium fluoride (MgF.sub.2), and a third layer 7 of uneven exposed surface, are deposited, whereby a multiplicity of concave regions of said third layer 7 form an interference film together with said first 5 and second layer 6, whereas a multiplicity of convex regions of said third layer form an irregular reflection surface.

Abstract: The inner surface of a video display panel such as cathode ray tube (CRT) glass faceplate is initially coated with a mixture of one of the primary color phosphors, an organic binder such as polyvinyl alcohol (PVA) diluted with water, and a photoresist agent. The organic binder overcomes the poor adhesion to the glass faceplate of the photoresist which typically includes polyvinyl pyrrolidone (PVP) and reduces the oxygen which decreases phosphor exposure time. To overcome PVA and PVP incompatibilities which give rise to nonuniform film thickness, a vinyl pyrrolidone-vinyl alcohol (VP-VA) copolymer is added to the phosphor, organic binder and photoresist mixture in the range of 0.1-30 wt %. The copolymer with both the VP and VA functioning groups serves as a coupling agent between the PVA and PVP and eliminates incompatibilities between these components. The VP-VA copolymer preferably has a VP/VA mole ratio in the range of 20/80 to 80/20.

Abstract: Methods are available for making, and resultant structures of, a field emission display with soft luminescence and a comfortable image for a viewer of the display. The field emission display is formed with a baseplate and an opposing face plate. Field emission microtips are formed in openings in a conductive and insulating layer on the baseplate. An anode is formed on either the faceplate, or on the conductive layer surrounding each opening. Phosphorescent material is formed over the anode. A blocking layer is formed between the phosphor and the faceplate, such that during operation of the display direct light emission from the phosphor is blocked, resulting in indirect phosphorescence and a more comfortable display image. An optional reflective layer may be added over the conductive layer to increase phosphorescence.

Abstract: The present invention relates to a cathode-ray tube having: (1) a face panel; (2) a phosphor screen; (3) a funnel coupled to the face panel; and (4) an electron beam emitter. The outer surface of the face panel is defined by using orthogonal coordinates. An origin of the orthogonal coordinates is defined as a center of the outer surface of the face panel. An X-axis of the orthogonal coordinates is defined as a horizontal axis. A Y-axis of the orthogonal coordinates is defined as a vertical axis. A Z-axis of the orthogonal coordinates is defined as the central axis of the funnel. The Z coordinate for points on the outer surface of the face panel are defined by the polynomial: ##EQU1## wherein i and j are integers .gtoreq.0, n=2, and aij are predetermined coefficients of the polynomial. The predetermined coefficients along the X-axis are represented by a.sub.10 and a.sub.20, and coefficients along the Y-axis are represented by a.sub.01 and a.sub.02. The coefficients a.sub.10, a.sub.20, a.sub.01, and a.sub.

Abstract: A grooved anode plate 40 for use in a field emission flat panel display device comprises a transparent planar substrate 42 having a plurality of electrically conductive, parallel stripes 46 comprising the anode electrode of the device, which are covered by phosphors 48.sub.R, 48.sub.G and 48.sub.B. In one embodiment, grooves 50, having generally straight sidewalls, are formed in the upper surface of planar substrate 42 at the interstices of conductors 46. In a second embodiment, grooves 50', which provide a substantial undercutting of the material of substrate 42' adjacent the edges of conductors 46', are formed in the upper surface of planar substrate 42' at the interstices of conductors 46'. A substantially opaque, electrically insulating material 52 is affixed to substrate 42 in the grooves 50 formed between conductors 46, acting as a barrier to the passage of ambient light into and out of the device.

Abstract: A color cathode ray tube with reduced desquamation includes a panel on which spaced-apart phosphor elements and a black matrix, filling the spaces between and contacting the phosphor elements, are disposed. A metal back covers the phosphor layer and the black matrix and is in direct contact with the black matrix and is spaced from and does not contact the phosphor elements. The direct contact with substantially all the black matrix and the complete separation from the phosphor elements improves the adhesion of the metal back while increasing luminance and reducing desquamation of the metal back.

Abstract: The color cathode ray tube of this invention improves the purity (color purity) adjustment margin and permits bright display without deteriorating the resolution. At least the black matrix holes 40g, 40b, 40r, forming the phosphor surface or the shadow mask apertures are so arranged that the center-to-center distance between the adjacent holes or apertures corresponding to the pixel phosphors of the same color in a vertical direction is greater by about 10 to 70% than the center-to-center distance in an inclined direction. Further, at least the black matrix holes or the shadow mask apertures are shaped non-circular with their vertical cross-section greater than their horizontal cross-section. With this invention it is possible to provide a color cathode ray tube which has improved brightness and purity (color purity) adjustment margin and a substantially enhanced resolution.

Abstract: A resonant microcavity display, comprising a thin-film resonant microcavity with a phosphor active region is disclosed. The microcavity comprises: a rigid substrate; a front reflector disposed upon the rigid substrate; a phosphor active region disposed upon the front reflector; and a back reflector disposed upon the active region. The display preferentially emits light that propagates along the axis perpendicular to plane of the display, due to its quantum mechanical properties. It exhibits high external efficiency, highly controllable chromaticity, high resolution, highly directional output and highly efficient heat transfer characteristics. For these reasons it provides a suitable display element for projection screen television, high definition television, direct view television, flat panel displays, optical coupling, and other applications.

Abstract: An image display faceplate having a plurality of recesses (dimples) formed therein for receiving discrete phosphor droplets and having a conformal metallization layer disposed thereon is provided. The phosphor system so described may be dispensed onto the faceplate without the need for multiple sequential depositions, maskings, and material removals and provides for a single step deposition of dis-similar phosphor materials of which the phosphor system is comprised.

Abstract: A CRT having a phosphor layer on the inner surface of a panel wherein the longer side of the phosphor layer is concave with respect to the longer side of the panel, thereby providing a screen which has a rectangular appearance.

Abstract: A color cathode ray tube of the type having a color selection electrode arranged in front of the display screen, is characterized in that the inner surface of the screen exhibits a deviation from an arc shape along the long X axis such that, in operation, the effect of doming is reduced. Preferably, the deviation decreases as the distance to the long axis increases. In an embodiment, the inner surface also exhibits a deviation from an arc shape along the short y-axis.

Abstract: In a flat panel display using a field emission type cathode array, a flat fluorescent screen is arranged between a cathode array formed on a flat substrate and a screen comprising a glass plate having a convex curved shape in parallel with the substrate. A vacuum is present in a space between the fluorescent screen and the cathode array and the space between the fluorescent screen and the substrate.

Abstract: In a cathode ray tube panel, contour lines of uniform thickness are continuous, closed loops without discontinuities at the periphery of the screen providing a natural picture throughout the panel. Hence, a distorted picture rarely occurs at the periphery of the panel.

Abstract: A shadow mask type color cathode ray tube which has a face panel whose screen face is flattened to more than two times the flatness of the conventional flat panels without reducing the resistance of the glass bulb to outside pressure in spite of its relatively thin glass wall, and has an enhanced reflection characteristic of incident light as well as improved local doming characteristics.

Abstract: The present invention provides an improvement in a cathode-ray tube that includes a rectangular faceplate having two long sides and two short sides wherein the ratio of the length of the long sides to the length of the short sides is approximately 16 to 9. The tube includes a major axis which parallels the two long sides and a minor axis which parallels the two short sides. The improvement comprises the ratio of the equivalent radius of the faceplate curvature along the major axis to the equivalent radius of the faceplate curvature along the minor axis being in the approximate range of 1.5 to 1.6, the ratio of the equivalent radius of the faceplate curvature along the long sides of the faceplate to the equivalent radius of faceplate curvature along the major axis being in the approximate range of 1.12 to 1.

Abstract: A thin film phosphor screen structure includes a light-transmitting substrate layer, a phosphor layer on the substrate layer formed with a plurality of parabolic-shaped cells containing phosphor material, and a reflective layer coated over the parabolic phosphor cells for reflecting light generated in the cells for transmission externally through the substrate layer. The parabolic cells are configured corresponding to the desired resolution of the display and to critical angle of diffraction for the phosphor/substrate interface. An anti-reflection coating may be applied at the phosphor/substrate interface. The phosphor layer may have a graded dopant structure or an impressed electric field for causing generated electrons to migrate toward the focal plane of the parabolic phosphor cells.

Abstract: A large area display has a plurality of cathode ray tubes mounted adjacent each other in X, Y matrix and each cathode ray tube includes a plurality of pixels arranged in an X, Y matrix on a front panel and each pixel comprises three horizontally extending stripe-shaped luminous elements aligned in the vertical direction and the front panel of the cathode ray tube is formed with a thinner portion adjacent its outer edge where it joins to the funnel to reduce the spacing between adjacent cathode ray tubes to a minimum to allow the pixels to be viewed over a wider angle.

Abstract: A color picture tube includes a vacuum envelope having a faceplate, a phosphor screen formed to include semitransparent black light-absorption layers coated on a first region of the faceplate in stripes or in a matrix, and phosphor layers of blue, red and green emitting phosphors coated on a second region of the faceplate in stripes or in dots, and an electron gun, arranged within the vacuum envelope, for emitting and focusing electron beams. End portions of the phosphor layers extend over the black light-absorption layers, thereby forming overlapped portions. Gaps are provided between the phosphor layers and over the black light-absorption layers, thereby forming light-absorption sections on which no phosphor layer is provided.

Abstract: The method of surface-treating dry-powdered phosphor particles for use in manufacturing a viewing screen for a CRT to control the triboelectric charge characteristics of the phosphor particles includes the steps of dissolving a suitable quantity of a polymeric coupling agent in a suitable solvent to form a mixture, surface-treating the phosphor particles by adding them to the mixture to provide a coating of the coupling agent thereon, and then drying the surface-treated phosphor particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent controls the triboelectric charge characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: Disclosed are a method for the fabrication of a color television tube as well as a front panel for trichromatic television tubes. The disclosure can be applied to the reception of high-definition television transmissions. According to the disclosure, the front panels designed for a high-definition television tube screen are elements of the group of surfaces defined byZ=.SIGMA.(C(i).multidot.x.sup.j(i) .multidot.y.sup.k(i)Z(i)=Co(i).multidot.F.sup.-(j(i)+k(i)-1)100.multidot.ABS(Zn-Z)<5.multidot.Zdwhere Z is the dimension of a surface of the group, Zn the dimension of a test surface and Zd the dimension of the maximum value of the dimension of the surface. Co corresponds to a reference surface of the group.

Abstract: A polychromatic cathode ray tube includes a screen formed by a single layer of a crystalline semiconductor material which luminesces in visible light when excited by an electron beam. The color of luminescence is varied by modulating the heat energy imparted to the layer by the electron beam.

Abstract: The present invention provides an improvement in the appearance of a cathode-ray tube including a rectangular faceplate with an exterior surface having curvature along both the minor and major axes. The faceplate also includes a cathodoluminescent screen on an interior surface thereof. At least in the center portion of the faceplate, the curvature along the minor axis is at least 10 percent greater than the curvature along the major axis. Points on the exterior surface near the ends of the major axis, at the edges of the screen, lie in a first plane which is perpendicular to the central longitudinal axis of the tube; points on the exterior surface near the ends of the minor axis, at the edges of the screen, lie in a second plane which is spaced from and parallel to the first plane; and points on the exterior surface near the ends of the diagonals of the rectangular faceplate, at the edges of the screen, lie in a third plane which is spaced from and parallel to the first plane.

Abstract: In a projection type color picture display system having red, green and blue picture producing cathode-ray tubes in which the green picture producing cathode-ray tube is capable of emitting green light defined as x.ltorsim.0.330 and y.gtorsim.0.570 in the CIE chromaticity diagram, use is made of a ZnS: Ag, Al phosphor material for forming the phosphor screen of the blue picture producing cathode-ray tube. The projection type display system thus obtained is capable of displaying color pictures with a high color purity and a high saturation.

Abstract: In a CRT for constituting a display apparatus in which the fluorescent screen is composed of a large number of CRTs arranged in the matrix form, a plurality of holes for passing an electron beam are provided in an electrode for controlling the electron beam which is so placed as to confront the cathode for emitting the electron beam, for the purpose of attaining improved modulation characteristics and a simplified drive circuit requiring lower power consumption. A plurality of fluorescent screens having individual luminous colors are formed on respective portions obtained by dividing the inside of the panel of said CRT and individual electron beams are respectively applied to those fluorescent screens, resulting in a picture of good quality because of increased picture elements.

Abstract: In a vacuum-tight picture-reproducing device having a flat glass faceplate and a metal tray-shaped back case with an outwardly curved bottom and a continuous flange, the flange has a perpendicular extension. The faceplate has end surfaces embraced by the extension and lies on the flange. The end surfaces of the faceplate and the flange with the extension are permanently joined together by a silver-containing tin-base solder. The joint may be covered by a metal layer.

Abstract: Components-in process and assemblies-in-process are disclosed for use in the manufacture of a high-resolution color cathode ray tube having a tensed foil shadow mask. A first component-in-process comprises a faceplate with a target area for receiving at least one pattern of phosphor deposits. The faceplate has attached at preselected, widely spaced locations on the sides thereof a plurality of discrete, detachable first indexing elements. A second component-in-process comprises a shadow mask support assembly having a frame ultimately constituting a part of the tube envelope; the frame supports the shadow mask in precise adjacency to the target area. The frame has attached on the sides thereof a like plurality of discrete, detachable second indexing elements which are in facing adjacency to the first indexing elements on the faceplate when the faceplate and frame are mated. Temporary attachment of the indexing elements is by means of a thermally degradable cement.

Abstract: In a color picture tube, curvature of outside face of said face panel is defined by ##EQU1## wherein Z is a distance in a direction of tube axis from an X-Y plane tangential at the center of the face, r is a distance from the center of the face panel to said point therealong, and A and B are constants of positive integers, respectively; thus the face panel excludes point of inflection and the reproduced picture thereon has a flat appearance, without trouble of undesirable doming of shadow mask.

Abstract: A beam-index type color cathode ray tube device which includes a front panel portion, a screen panel portion which faces the front panel portion, a phosphor screen including a plurality of index phosphor stripes fixed to the inner surface of the screen panel portion and extending at regularly spaced intervals. A porous inorganic layer is fixed on the inner surface of the screen panel portion and extends between each adjoining pair of the index phosphor stripes. A metallic reflecting layer covers the index phosphor stripes and the porous inorganic layer. A plurality of color phosphor stripes is applied to the metallic reflecting layer in a predetermined pattern. A photodetecting portion disposed at the outside of the screen panel portion receives fluorescence from the actuation of the index phosphor stripes.

Abstract: A color image recording apparatus for recording a color image uses a cathode-ray tube having a screen with an inner surface to be bombarded with an electron beam, which is coated in a striped manner with a first fluorescent material for emitting blue and green light and with a second fluorescent material for emitting red light, and its outer surface is provided with a blue filter and a green filter each opposed to a respective portion of the first fluorescent material, and with a red filter opposed to the second fluorescent material. Successive scanning lines are formed on a surface by relatively moving the position of the scanning line on the surface in a direction perpendicular to said scanning direction so that each scanning line is scanned by light from each of the colors.

Abstract: A color display tube comprising an envelope consisting of a neck, a cone, and a flat or slightly curved display window having a skirt which is substantially parallel to the axis of the envelope. The inner surface of the display window is joined to the inner surface of the skirt via a sharply curved surface. The display window has on its inside a substantially rectangular display screen comprising a material luminescing in at least one color and over which an aluminum film is provided. Means is provided in the neck to generate at least one electron beam. By making the outer periphery of the display window extend substantially parallel to the boundary of the luminescent material of the display window, and by making the camber a'/b' of the sides of the boundary outwards smaller than 0.

Abstract: Methods and apparatus for solving the problem of non-uniform phosphor aging of the screen of a dual mode television receiver having the capability of displaying the picture image in two different aspect ratios, for example, 4:3 and 5:3. In one embodiment, the entire screen is illuminated during display of a 4:3 aspect ratio image on the central area of the screen so as to effect uniformity of aging over the entire screen. Alternatively, the areas at either side of the central 4:3 aspect ratio image area are not illuminated during display of 4:3 aspect ratio images but are, instead, post-aged following a period of display of such images. Another solution is to electrically compensate for the faster aging of the central 4:3 aspect ratio are of the screen when viewing 5:3 aspect ratio pictures.

Abstract: An improvement is made in a color picture tube having a substantially rectangular slit-aperture type shadow mask mounted therein in spaced relation to a substantially rectangular cathodoluminescent line screen. In the specific improvement, the cathodoluminescent lines of said screen, in front plan view, first increase in curvature with an increase in distance from the minor axis of the screen and then decrease in curvature with further increase in distance from the minor axis, to become substantially straight at the short sides of the screen.

Abstract: In a CRT system the luminescent screen includes an ordered array of rows and columns of phosphor elements, illustratively made of single crystal material. Each element is surrounded on all sides (except the light output face) by reflective material. To enhance light extraction efficiency, the output face may be textured. An electron beam is made incident on the output face of selected ones of the elements and scans in two dimensions across the plane of the elements. Also described is an arrangement whereby the electron beam is made incident on the back surface of the elements opposite the output face.

Abstract: A multicolor cathode-ray tube for use as a light source in a giant display system such as a display board for a sports stadium. The cathode-ray tube includes a plurality of electron guns and respective fluorescent screens, the latter receiving the beam from a corresponding electron gun. Each of the screens is slanted towards the longitudinal axis of the tube. The screens may be either flat or curved.

Abstract: By adjusting the exposure dosages for the three primary color phosphors in the photolithographic process used to produce color CRTs for color television, standard whites of desired color temperatures are obtained. The aperture mask used in the photolithographic process is then discarded, and the CRT is operated as a monochrome tube in a standard receiver. Stable, rugged and portable color references are thus produced.

Abstract: A color display tube comprising a faceplate including a display window connected to a skirt which is substantially parallel to the axis of the envelope via a sharply curved transition portion. The set of points defining where the inner surface of the window meets the inner surface of the transition part is formed by a closed line l. The set of points defining where the outer surface of the window meets the outer surface of the transition portion is formed by a closed line m. A display screen of luminescent material provided on the inner surface of the display window has a substantially rectangular boundary which coincides substantially with the line l. A large viewing angle .alpha. is obtained within which no distortion of the picture edge occurs when, from any point Q in the line m, the shortest connection line to the line l encloses with a normal line h (normal to the outer surface of the window) an angle .gamma., for which the relationship holds that:n sin .gamma.=sin (.alpha.-.beta.

Abstract: The present invention provides an improvement in a cathode-ray tube including a rectangular faceplate which has an exterior surface having curvature along both the minor and major axes. The faceplate also includes a cathodoluminescent screen on an interior surface thereof. At least in the center portion of the faceplate, the curvature along the minor axis is greater than the curvature along the major axis. In the improvement, points on the exterior surface near the ends of the minor and major axes, at the edges of the screen, lie in a first plane, and points on the exterior surface near the ends of the diagonals of the rectangular faceplate at the edges of the screen, lie in a second plane. The second plane is parallel to the first plane and is farther from the center portion of the faceplate than is the first plane.

Abstract: A color projector apparatus including a single cathode ray tube of index-type having a first transparent panel with phosphor elements of three primary colors and an indexing element formed on the inner surface thereof, a second transparent panel located in front of the first transparent panel of cathode ray tube, a metal frame-shape spacer for supporting the second transparent panel, and a transparent liquid coolant filled into the space between the first and second transparent panels.

Abstract: 1.