Abstract: In the vicinity of an end on the side of a large diameter portion of a deflection device, a pair of first permanent magnets for converging three electron beams in an X-axis direction and a pair of second permanent magnets for diverging them in the X-axis direction are provided. Inclination coefficients KTBH and KEWH of the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of the magnetic fields respectively formed by the pair of first permanent magnets and the pair of second permanent magnets satisfy KTBH/KEWH<10 in at least one location within a range of 3 to 13 mm on the side of the phosphor screen with respect to a reference line in the Z-axis direction.

Abstract: A deflection yoke includes a horizontal deflection coil, a vertical deflection coil, an insulating frame made of an insulating material, a deflection adjusting plate attached to an outer circumferential surface of the insulating frame, and a ferrite core covering at least a part of an outer circumference of the insulating frame. The deflection adjusting plate is fixed to the outer circumferential surface of the insulating frame, under the condition of being surrounded by a high-soft resin material with a hardness of 10 to 60. Because of this, even when the deflection adjusting plate vibrates during driving, the deflection adjusting plate does not directly bump into the insulating frame, so that the noise generated by the deflection yoke can be reduced significantly.

Abstract: A shadow mask includes a perforated region in which a plurality of electron beam passage apertures are formed, a non-perforated region on the periphery of the perforated region, and a skirt portion bent to an electron gun side with respect to the non-perforated region. The curved surfaces on an x-axis and a y-axis of the perforated region are convex to a panel side. The perforated region includes a curved surface that is convex to the panel side and a curved surface that is convex to the electron gun side on a periphery of the perforated region. Furthermore, the perforated region has a curved surface that is convex to the panel side and a curved surface that is convex to the electron gun side in a region surrounded by the periphery, the x-axis, and the y-axis.

Abstract: A driving circuit includes a power supply portion for supplying a voltage, an electric current path switching portion for switching a path of an electric current, a resonance portion in which the drive voltage is generated, and a resonance suppressing portion for suppressing the drive voltage generated in the resonance portion in a critical state. The drive voltage has at least one pair of continuous waveforms with different polarities with respect to a reference voltage. The waveforms of the drive voltage have a peak voltage higher than the voltage supplied from the power supply portion. The waveforms converge after the at least one pair of continuous waveforms with different polarities with respect to the reference voltage is applied to the display element. This makes it possible to supply a drive voltage having a waveform in which a positive polarity and a negative polarity are reversed periodically to a display element with a simple configuration and a low power loss.

Abstract: A radius of curvature of an arc passing through three points on an outer surface of a panel, which respectively correspond to a pair of diagonal axis ends on one diagonal axis of a phosphor screen and a center of the phosphor screen, is 10,000 mm or more. A shadow mask is made of an aluminum killed material. Assuming that a thickness of the panel is Td at the diagonal axis end of the phosphor screen, Tmd at an intermediate point between the diagonal axis end and the center, Th at a major axis end of the phosphor screen, and Tmh at an intermediate point between the major axis end and the center, 0.5 ?Tmd/Td?0.62, and 0.65?Tmh/Th?0.80 are satisfied. Because of this, an inexpensive color picture tube can be provided, in which the visibility is excellent, the degradation in color purity caused by doming is suppressed, and the formability of the shadow mask is enhanced.

Abstract: The present invention provides a green emitting yttrium silicate phosphor, which has an improved temperature characteristic and life, and a cathode-ray tube using it. A green emitting yttrium silicate phosphor according to the present invention comprises a composition having the general composition (Y, Sc, Tb)2SiO5, wherein the mole ratio of Sc to the entire rare-earth element in the phosphor is 0.045<Sc/(Y+Sc+Tb)<0.17. Adding the above concentration range of Sc improves its temperature characteristic and life. It is more preferable that the concentration range is 0.07<Sc/(Y+Sc+Tb)<0.13.

Abstract: A ferrite core constituting a deflection yoke has a plurality of ridge-shaped convex portions on an inner circumferential surface. In a cross-section orthogonal to a center axis, the cross-sectional shape of an outer circumferential surface of the ferrite core is substantially circular, and the cross-sectional shape of an inner circumferential surface of the ferrite core excluding the convex portions is substantially circular in the vicinity of an end on a large diameter side of the ferrite core and is substantially rectangular in a portion between the vicinity of an end on a small diameter side and the vicinity of the end on the large diameter side. This can provide a low-cost color picture tube apparatus with a reduced deflection power and satisfactory productivity.

Abstract: When the thickness of the panel at an X axis end of the useful portion is expressed by Tx (mm), the thickness thereof at a Y axis end is expressed by Ty (mm), the thickness thereof at the center is expressed by Tc (mm) and an outer dimension of the panel along the diagonal axis direction is expressed by D (mm), 0.8?(100×Tc/D)2×(Tx/Ty)?2.2 and 0.012?Tc/D?0.019 are satisfied. Accordingly, the stress generated in a short side and that generated in a long side in a sealing portion in an exhausting process are substantially equalized. As a result, cracking of the panel can be reduced in the exhausting process even when the panel is made thinner. Therefore, it is possible to provide a cathode ray tube that is easy to manufacture and has a lighter and less expensive panel.

Abstract: A substantially rectangular shadow mask in a dome shape includes a plurality of tie-bands with a longitudinal direction thereof being a short-side direction of the shadow mask, a plurality of bridges connecting the tie-bands adjacent to each other in a long-side direction of the shadow mask, and a plurality of electron beam passage apertures formed between the tie-bands. In a region sandwiched by a pair of straight lines parallel to the long-side direction, which respectively pass through a pair of the bridges adjacent to each other in the short-side direction, on a surface of the tie-band on a side opposed to a panel, a plurality of non-through concave portions are formed. Consequently, color displacement caused by heat doming of the shadow mask can be suppressed.

Abstract: A curve formed by an inner surface of a face panel in a cross-section including a tube axis of a color picture tube is defined. The face panel includes at least one cross-section in which the curve has an inflection point between a center of the face panel and a circumferential edge of an effective display region. Assuming that a maximum value of an angle formed by a tangent of the curve and a plane orthogonal to the tube axis between the center of the face panel and the inflection point is ?A, and a minimum value of an angle formed by the tangent of the curve and the plane orthogonal to the tube axis between the inflection point and the circumferential edge of the effective display region is ?B, the curve having the inflection point satisfies 0.6??B/?A<1.0. Because of this, a color picture tube having satisfactory screen quality can be provided.

Abstract: A CPU for adjusting color purity and color displacement at the center of a screen is provided on an outer circumferential surface of a neck portion. BVM coils for modulating a scanning velocity in a horizontal direction of electron beams are provided at a position where they are overlapped with the CPU in a tube-axis direction. A ring-shaped ferrite core is provided at a position where it is overlapped with the BVM coils in the tube axis direction. Two surfaces vertical to a tube axis of the ring-shaped ferrite core are covered with resin layers. Because of this, the ring-shaped ferrite core can be prevented from being cracked.

Abstract: A main lens is formed by a focus electrode, an intermediate electrode, and an anode electrode successively arranged in a traveling direction of an electron beam. The focus electrode and the anode electrode respectively have an electron beam passage aperture common to three electron beams, having a major axis in a horizontal direction in a portion opposed to the intermediate electrode, and three electron beam passage apertures through which the three electron beams pass are formed respectively in the focus electrode and the anode electrode. Aperture dimensions in a vertical direction of the electron beam passage apertures common to the three electron beams formed respectively in the focus electrode and the anode electrode are smaller than those in the vertical direction of the electron beam passage apertures formed in portions of the intermediate electrode respectively opposed to the focus electrode and the anode electrode.

Abstract: A pair of velocity modulation coils are placed with a horizontal plane including a tube axis interposed therebetween, and a pair of magnetic substances are placed with a vertical plane including a tube axis interposed therebetween. A straight line portion of the velocity modulation coil extending substantially in parallel to the tube axis is placed between the magnetic substance and the tube axis. An interval D between the magnetic substance and the straight line portion is 1 to 3 mm. Assuming that the tube axis is a Z-axis, a size of the velocity modulation coil in a tube axis direction is L, and a position of an end of the velocity modulation coil on a side opposite to a phosphor screen in the tube axis direction is Z=0, a center point of the pair of magnetic substances in the tube axis direction is present in a range of Z=0.2×L to 0.9×L. Consequently, the sensitivity of velocity modulation can be enhanced while suppressing an increase in a driving power with a simple configuration.

Abstract: A ferrite core constituting a deflection yoke includes a plurality of convex portions in a ridge shape on an inner surface thereof. Among the plurality of convex portions, assuming that the convex portions in a range excluding a range of ?20° to +20° with respect to a horizontal axis and a range of ?20° to +20° with respect to a vertical axis are diagonal convex portions, the lengths in a tube axis direction of at least horizontal axial convex portions on a horizontal axis or vertical axial convex portions on a vertical axis are larger than those of the diagonal convex portions. Because of this, a color picture tube apparatus with a deflection power reduced can be provided while the degree of freedom in a winding arrangement of deflection coils is secured.

Abstract: A deflection coil for deflecting an electron beam emitted from an electron gun is provided outside a cathode-ray tube in which the electron gun is housed, and a phosphor screen is formed. The cathode-ray tube further includes a velocity modulation coil for modulating a horizontal scanning velocity of an electron beam, a first magnetic substance surrounding an outer circumference of the cathode-ray tube from outside the velocity modulation coil, and a second magnetic substance surrounding the outer circumference of the cathode-ray tube between the deflection coil and the first magnetic substance. Because of this, the sensitivity of velocity modulation can be enhanced effectively with a simple configuration while deflection distortion is prevented.

Abstract: BVM coils for modulating a scanning velocity in a horizontal direction of electron beams emitted from an electron gun are provided at a position where the BVM coils are overlapped with an electron gun in a tube axis direction, and a pair of magnetic substance pieces are provided at a position where the pair of magnetic substance pieces are overlapped with the BVM coils in the tube axis direction. The pair of magnetic substance pieces surround a funnel continuously in a circumferential direction of an outer circumferential surface of the funnel, except for a portion of the surface that intersects a plane defined by the tube axis and a vertical direction axis, and the vicinity of that portion. Because of this, a cathode-ray tube apparatus with the sensitivity of the BVM coils enhanced can be provided.

Abstract: A color conversion film of the present invention is formed of a color-conversion material composition containing: an organic solvent having a pyrrolidone group represented by the following formula (I) (component A); a resin material containing at least one of optically active or inactive translucent monomer, oligomer and polymer (component B); and at least one type of phosphor (component C). A multicolor light-emitting device of the present invention includes a light-emitting device and a translucent substrate provided thereon, in which the color conversion film is provided between the light-emitting device and the translucent substrate. Thereby, a color conversion film with an improved color-conversion efficiency and a multicolor light-emitting device provided with such a color conversion film can be provided.

Abstract: A phosphor screen is formed on an inner surface of a face portion whose outer surface is substantially flat. A shadow mask faces the phosphor screen. The shadow mask includes a perforated portion having a plurality of apertures, a non-perforated portion formed on a periphery of the perforated portion and a skirt portion formed on a periphery of the non-perforated portion. The non-perforated portion includes a pair of longer side portions each having an outer bead and an inner bead that are adjacent to each other and a pair of shorter side portions each having the outer bead and an inner bead that are adjacent to each other. In each of the pair of longer side portions, the spacing between the outer bead and the inner bead is at least 2 mm. This makes it possible to suppress wavy wrinkles generated in the perforated portion, so that the image quality of a color picture tube can be improved.

Abstract: A focusing electrode includes an electric field correcting electrode, and a peripheral electrode in which one electron beam passage aperture is formed on a surface opposed to a final-stage accelerating electrode. The final-stage accelerating electrode includes an electric field correcting electrode, and a peripheral electrode in which one electron beam passage aperture is formed on a surface opposed to the focusing electrode.

Abstract: The radius of curvature of the outer surface of a panel is 10,000 mm or more, and a shadow mask is made of a material containing 95% or more of iron. A sagging amount change curve along a curve C1 on the surface of the shadow mask, which a plane passing through a center P0 of a useful area of the shadow mask and parallel to a tube axis and a major axis crosses, satisfies a particular Condition 1. Assuming that an intersection between the curve C1 and a useful area end of the shadow mask is a major axis end PL, a distance from the center P0 to the major axis end PL along a major axis is W, and a point on the curve C1 away from the center P0 by ?×W in the major axis direction is P1, a sagging amount change curve along a curve C2 on the surface of the shadow mask, which a plane passing through the point P1 and parallel to the tube axis and the minor axis crosses, satisfies a particular Condition 2.