Abstract: A lead-free organic sealant with which sealing can be carried out at a temperature lower than 400° C., and which is excellent in strength at high temperature. Specifically, an organic sealant for sealing envelope-constituting members to constitute a vacuum envelope for an image display device, wherein a fired body of the organic sealant has a minimum viscosity of at most 103 Pass within a temperature range of at least 300° C. and lower than 400° C., and the fired body of the organic sealant satisfies 0.99<m400/m20?1.00, where m20 is the mass at 20° C., and m400 is the mass at 400° C.

Abstract: The present invention is to obtain a glass bulb of reduced weight, and high safeness and reliability by ion exchanging which assures a compressive stress layer having an effective thickness even to a large tensile vacuum stress. For this purpose, a region in an outer surface of a body portion 4 of the glass funnel, the region having a small mechanical strength and producing the maximum tensile vacuum stress thereby causing breakage easily, is partly strengthened by ion exchanging method according to an electric field assisting method and an ion exchanging method using paste in combination, whereby a portion 9 strengthened by ion exchanging method is provided in that region wherein the concentration of doped ions in a strengthened compressive stress layer is distributed according to a substantially step function in a direction from the surface of the glass toward the inside of it.

Abstract: A lead-free organic sealant with which sealing can be carried out at a temperature lower than 400° C., and which is excellent in strength at high temperature. Specifically, an organic sealant for sealing envelope-constituting members to constitute a vacuum envelope for an image display device, wherein a fired body of the organic sealant has a minimum viscosity of at most 103 Pa•s within a temperature range of at least 300° C. and lower than 400° C., and the fired body of the organic sealant satisfies 0.99<m400/m20?1.00, where m20 is the mass at 20° C., and m400 is the mass at 400° C.

Abstract: To provide a novel glass composition having the property of browning substantially improved, while securing an adequate X-ray absorption property and while suppressing devitrification of a panel glass to a practically problem-free level, in preparation for higher voltage and larger current for projection type cathode ray tubes. A panel glass for cathode ray tube, having a glass composition containing substantially no PbO, and more than 10 mass % and at most 15 mass % of ZnO, wherein (MgO (mass %)+ZnO (mass %))/(SrO (mass %)+BaO(mass %)+CaO (mass %))>0.55, and wherein when the sum of Na2O (mol %), K2O (mol %) and Li2O (mol %), as represented by mol percentage, is represented by R2O, 0.15?Na2O (mol %)/R2O?0.25, and 0.45?K2O (mol %)/R2O?0.55, and the linear absorption coefficient of X-ray having a wavelength of 0.06 nm is at least 36.0 cm?1.

Abstract: An envelope for e.g. FED has spacerless structure while increase of the mass due to increase of the thickness of glass is suppressed. Further, the handling of conductors connected to emitters can be easy. An envelope for a flat panel display comprising a glass envelope and a support member for preventing deformation, wherein the glass envelope comprises a front glass and a rear glass, and the support member comprises a rim, bridges and a rear plate. The front glass comprises a face portion for displaying an image and a skirt portion is extended to the rear glass so that a hermetical seal is kept by the contact of a seal edge portion at the end of the skirt portion to the rear glass, the rim supports outer peripheries of outer surfaces of the skirt portion and the face portion, the rear plate is fixed to the rear glass to support the rear glass, and the rim and the rear plate are connected via a plurality of bridges.

Abstract: A glass funnel for a cathode ray tube, which has a substantially rectangular opened end at one end and a neck portion at the other end and which constitutes, together with a glass panel having a substantially rectangular face portion, a glass bulb to be used for a cathode ray tube, wherein the glass constituting the glass funnel contains, by molar percentage, at least 60% of SiO2 and at least 7% of PbO; when the molar percentages of Na2O and K2O contained in said glass are represented by WNa and WK, respectively, 0.35?WK/(WNa+WK)?0.6; a compressive stress layer is formed by chemical tempering at least in the outer surface of a region containing a position where the tensile stress formed when the interior of the glass bulb is vacuumed to produce the cathode ray tube, becomes maximum; and either one or both of the outer surface of the chemically tempered region and the inner surface opposite to said outer surface, are colored by ion exchange coloration.

Abstract: A glass bulb for a color cathode ray tube, which comprises a panel, a funnel connected to the panel and a neck, the panel comprising a face portion and a skirt portion constituting a side wall of the face portion and having a seal edge portion at the end portion, wherein such a compressive stress &sgr;c that 50 MPa≦|&sgr;c|≦250 MPa is produced by an ion-exchange method to at least one of short axis end portions and long axis end portions on the outer surface of the face portion; the average thickness t=(tc+tmax)/2 of the face portion represented by the central thickness tc of the face portion and the maximum thickness tmax of the face portion, and the thickness tse at the seal edge portion, satisfy the relation t/tse≦1.4; and the maximum value &sgr;VTmax of the tensile stress generated at the face portion when vacuumized is 20 MPa≦&sgr;VTmax<200 MPa.

Abstract: A glass funnel for a cathode ray tube capable of increasing the rigidity of a body portion having a rectangular-shaped open end portion and reducing the weight of the glass funnel wherein on at least a long side of the body portion, arched face portions are formed so as to be substantially perpendicular to an open end face of the body portion and an arch-like ridge portion in each of the arched face portions is extended to portions in the vicinity of the open end portion, whereby stresses generated in the body portion can be transmitted to the corner portions of high rigidity of the open end portion along the ridge portions.

Abstract: A glass panel for a color cathode ray tube, which has a linear absorption coefficient of X-ray with a wavelength of 0.06 nm of from 30 to 38 cm−1 and which has a layer having a compression stress of at least 70 MPa formed by a chemical strengthening method at least at short axis end portions and/or long axis end portions of the outer surface of a face portion and at a center portion of the inner surface of the face portion.

Abstract: The present invention relates to a color cathode ray tube and a glass frit to be used for it, and provides a color cathode ray tube which uses a glass frit containing as a crystallizing filler, an &agr;-4PbO.B2O3 crystal powder and/or a Pb3O4 crystal powder, and corpuscular &agr;-alumina, and at least one member selected from the group consisting of MgO, Fe2O3 and monoclinic ZrO2, for improvement of the strength at a sealed portion and for weight saving of the color cathode ray tube, wherein the maximum tensile stress generated at the above sealed portion is from 7 to 10 MPa when the inside is vacuumized, and the area ratio of crystal is at least 50% at the interface at the above sealed portion at at least the region at which the above maximum tensile stress is generated.

Abstract: There is provided a glass funnel for a cathode ray tube, which has a deflection angle of 120 deg or more, which has a concave portion in a funnel body portion around a yoke portion so as to have a depth of 10 mm or more, wherein a compressive stress layer is formed in a position where a tensile stress, which is generated on an outer surface of the funnel body portion, takes a maximum value &sgr;VTmax, the compressive stress layer has a compressive stress value &sgr;C of 80 to 350 MPa, the compressive stress layer has a thickness of 60 &mgr;m or more, and the maximum value &sgr;VTmax is 10 to 100 MPa.

Abstract: A glass funnel for a cathode ray tube, which has a substantially rectangular opened end at one end and a neck portion at the other end and which constitutes, together with a glass panel having a substantially rectangular face portion, a glass bulb to be used for a cathode ray tube, wherein the glass constituting the glass funnel contains, by molar percentage, at least 60% of SiO2 and at least 7% of PbO; when the molar percentages of Na2O and K2O contained in said glass are represented by WNa and WK, respectively, 0.35≦WK/(WNa+WK)≦0.6; a compressive stress layer is formed by chemical tempering at least in the outer surface of a region containing a position where the tensile stress formed when the interior of the glass bulb is vacuumed to produce the cathode ray tube, becomes maximum; and either one or both of the outer surface of the chemically tempered region and the inner surface opposite to said outer surface, are colored by ion exchange coloration.

Abstract: A panel glass wherein a surface treating film is formed on a substrate glass so that the surface treating film has a transmittance distribution reverse to the transmittance distribution of the substrate glass, thus providing a uniform-brightness image with a flattened panel glass.

Abstract: When a face portion 4 of a panel portion 1 has a central wall thickness of TC, an end of a useful screen area has a wall thickness of TL, a sealing end surface of a skirt portion has is a width of TS, and an intermediate part of a body portion 7 of a funnel portion 2 is TF, there are established the formulas of; TL/TC≧1.70, TS/TL=0.43−0.50, and TF/TC=0.37−0.49, and a strengthened compressive stress of 5-14 MPa is applied to a side of the skirt portion.

Abstract: A glass funnel for a cathode ray tube capable of increasing the rigidity of a body portion having a rectangular-shaped open end portion and reducing the weight of the glass funnel wherein on at least a long side of the body portion, arched face portions are formed so as to be substantially perpendicular to an open end face of the body portion and an arch-like ridge portion in each of the arched face portions is extended to portions in the vicinity of the open end portion, whereby stresses generated in the body portion can be transmitted to the corner portions of high rigidity of the open end portion along the ridge portions.

Abstract: The present invention is to obtain a glass bulb of reduced weight, and high safeness and reliability by ion exchanging which assures a compressive stress layer having an effective thickness even to a large tensile vacuum stress. For this purpose, a region in an outer surface of a body portion 4 of the glass funnel, the region having a small mechanical strength and producing the maximum tensile vacuum stress thereby causing breakage easily, is partly strengthened by ion exchanging method according to an electric field assisting method and an ion exchanging method using paste in combination, whereby a portion 9 strengthened by ion exchanging method is provided in that region wherein the concentration of doped ions in a strengthened compressive stress layer is distributed according to a substantially step function in a direction from the surface of the glass toward the inside of it.

Abstract: A glass bulb for a cathode ray tube comprising a panel portion having a substantially rectangular face portion and a funnel portion having a neck portion, wherein when the glass bulb is used for a cathode ray tube, the glass bulb at least regionally suffers from a tensile stress resulting from the atmospheric pressure on the outer surface of the glass bulb having a vacuum inside, at least part of the face portion of the panel portion where the tensile stress over the face portion has a maximum value &sgr;VP has a compressive stress layer formed by chemical tempering on the outer surface, and the &sgr;VP, the magnitude of the compressive stress on the compressive stress layer &sgr;C MPa, and the thickness of the compressive stress layer tC &mgr;m satisfy the following relationship: 120/tC≧(1−|&sgr;VP/&sgr;C|)>30/tC provided that &sgr;VP≧20 MPa.

Abstract: A panel glass having a surface treating film formed on a substrate glass so that an overall transmittance distribution within an effective picture plane satisfies a specific mathematical expression, whereby, even with a flattened panel glass, a uniform-brightness image can be observed with a good contrast, and occurrence of a double image is suppressed.

Abstract: A glass funnel for a cathode ray tube capable of increasing the rigidity of a body portion having a rectangular-shaped open end portion and reducing the weight of the glass funnel wherein on at least a long side of the body portion, arched face portions are formed so as to be substantially perpendicular to an open end face of the body portion and an arch-like ridge portion in each of the arched face portions is extended to portions in the vicinity of the open end portion, whereby stresses generated in the body portion can be transmitted to the corner portions of high rigidity of the open end portion along the ridge portions.

Abstract: A panel glass wherein a surface treating film is formed on a substrate glass so that overall transmittance distribution within an effective picture plane satisfies a specific mathematical expression, whereby, even with a flattened panel glass, a uniform-brightness image can be observed with a good contrast, and occurrence of a double image is suppressed; and a CRT.