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 co mmon 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 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: 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: When a deflection yoke is provided by winding horizontal deflection coils so that right and left ends of its bend portion on a screen face side protrude farther toward the screen face side than the center of the bend portion does, works for attaching vertical deflection coils and a core to an insulating frame can be carried out stably. The insulating frame is resin-molded so that an opening on the screen face side is shaped along the bend portion on the screen face side of a pair of upper and lower horizontal deflection coils. Protrusions (convexes) are provided at four positions between right/left portion “A” in a X-axis (horizontal axis) direction and top/bottom portion “B” in a Y-axis (vertical axis) direction of a periphery of the opening on the screen face side of the insulating frame.

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: A plurality of magnet rings for correcting a convergence are arranged in a tube axis direction with spacers interposed therebetween, on an outer circumferential surface of a neck. A velocity modulation coil for modulating a scanning velocity in a horizontal direction of an electron beam is placed so that a position of the velocity modulation coil in the tube axis direction is overlapped with those of the magnet rings. At least one of the spacers is made of only a magnetic substance. Alternatively, at least one of the spacers is made of a magnetic substance, and the outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material. Because of this, the magnetic field formed by the velocity modulation coil can be intensified without disturbing the magnetic field of the magnet rings of a CPU.

Abstract: A deflection device for a projection tube includes a main deflection device for generating a raster and an auxiliary deflection device for correcting a convergence. The auxiliary deflection device includes a toroidal auxiliary horizontal coil, a saddle-type auxiliary vertical coil, and a ferrite core. According to this configuration, the deflection efficiency is enhanced, and pincushion distortion in upper and lower portions can be corrected efficiently while a change in the shape of a beam spot is reduced.

Abstract: The object of the present invention is to provide a cathode ray tube that can prevent halation, reduce deflection power efficiently, and secure pressure resistance strength of a vacuum envelope.

Abstract: A projection tube apparatus includes: a valve made up of a face panel having a screen face on its external face, a funnel connected to a rear portion of the face panel, and a neck portion; an electron gun that emits an electron beam and is housed in the neck portion; and a deflection device mounted at an outer circumference of the funnel on the neck portion side. The deflection device at least includes: horizontal deflection coils that generate a horizontal deflection field for deflecting the electron beam in the horizontal direction; vertical deflection coils that generate a vertical deflection field for deflecting the electron beam in the vertical direction and is disposed outside the horizontal deflection coils; and a ferrite core disposed outside the vertical deflection coils. A distance Ls between an end portion of the horizontal deflection coils on the screen face side and the screen face is set to 55 mm?Ls?80 mm.

Abstract: A shadow mask structure is held on a panel via a support member in which a base member and a spring member are connected to each other in a substantially V-shape. The spring member includes a connecting portion connected to the base member, an engagement portion having an engagement hole in which a stud pin is fitted, and an elastic portion between the connecting portion and the engagement portion, tilted with respect to the base member and mainly having a spring function. Assuming that a width of an end of the elastic portion on the connecting portion side is A, a width of an end of the elastic portion on the engagement portion side is B, a width of a narrowest part of the elastic portion in a region including both the ends is C, and a minimum value of an effective width of the elastic portion in the region including both the ends is C?, relationships: A>C and B>C, and 0.40<C?/A<0.55 are satisfied.

Abstract: In a cross-section including a tube axis, assuming that T1 represents a thickness of a funnel at a point on an outer circumferential surface of the funnel, which is placed at the same position in a tube axis direction as that of an end of a horizontal deflection coil on a phosphor screen side, and T2 represents a thickness of the funnel at a point on the outer circumferential surface of the funnel, which is placed at the same position in the tube axis direction as a position 7 mm away from the end of the horizontal deflection coil on the phosphor screen side to the phosphor screen side along the tube axis, the funnel includes at least one cross-section including the tube axis satisfying a relationship: T2/T1?1.18. Owing to this, cone halation can be prevented while an X-ray leakage amount is limited to a predetermined value or less.

Abstract: An in-line type electron gun using a field superimposing type main lens system is provided that can attain good focusing properties by decreasing the size of the electron beam spot on the entire surface of the phosphor screen without being formed to be mechanically large. A field superimposing type main lens is formed by disposing two tubular electrodes opposite to each other and disposing a plate-like field correction electrode on each of the tubular electrodes on the sides not opposite to each other. On each of the opposite sides of the two tubular electrodes, an opening is formed by an edge portion and a folded portion. The shape of the opening may be an elongated flat-sided oval shaped aperture (laterally elongated aperture) that is formed by straight lines and semicircles and has a major diameter in the horizontal direction and a minor diameter in the vertical 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: 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 deflection yoke includes a ferrite core, a horizontal deflection coil, a vertical deflection coil, and an insulating frame for insulating the horizontal deflection coil from the vertical deflection coil. The deflection yoke has at least one cross section orthogonal to a tube axis that satisfies the following A to C. A: A plurality of magnetic substance convex portions projecting toward the tube axis are provided in the vicinity of a position of an inner surface of the ferrite core where a vertical axis crosses. B: Assuming that a minimum value among distances between the respective magnetic substance convex portions and a funnel is D1, the distance between the ferrite core excluding the plurality of magnetic substance convex portions and the funnel is larger than the distance D1 at any point of the ferrite core. C: Apart of the vertical deflection coil is wound in a groove between the plurality of magnetic substance convex portions.

Abstract: A bar-shaped element includes magnets at both ends and a magnetic material connecting the magnets to each other. One end in a major axis direction of the bar-shaped element is an N-pole, and the other end is an S-pole. A pair of bar-shaped elements sandwich a deflection yoke in a horizontal direction, with the major axis direction thereof being parallel to a vertical direction, and each of the bar-shaped elements is placed at a position between the end of a horizontal deflection coil on a phosphor screen side and a central position of a core in a tube axis direction, in such a manner that the magnetic poles at both ends are opposite to each other between the pair of bar-shaped elements. Because of this, PQH misconvergence is corrected without influencing power consumption at low cost by a simple method without using an auxiliary coil and a correction circuit, whereby satisfactory convergence can be realized.

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 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: On an outer circumferential surface of a neck portion of a funnel, a CPU having a pair of quadrupole magnets and a pair of bar-shaped magnets each having magnetic poles on both sides in a major axis direction are provided. The pair of bar-shaped magnets sandwich the neck portion substantially in an in-line direction of an in-line type electron gun, and are provided so that identical poles are opposed to each other, between an end plate of an insulating frame of a deflection yoke and the CPU at a distance from the end plate. In the case where a rotational shift of electron beams is caused, electron beams R and B are corrected so as to move upward and downward (or downward and upward) respectively by a quadrupole magnetic field generated by the quadrupole magnets. Then, the electron beams R and B are corrected so as to move downward and upward (or upward and downward) respectively by the quadrupole magnetic field generated by the pair of bar-shaped magnets.