Abstract: A cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a cylindrical neck, and a funnel connecting the panel and the neck. A phosphor screen arranged on the inner surface of the panel generates luminescence upon impingement of electron beams, which are generated by an electron gun assembly disposed in the neck. In order to create a image visible through the panel, a deflection yoke is mounted on the outer surface of the funnel to generate a magnetic field in the funnel, deflect the electron beams, and thereby scan the phosphor screen. According to the present invention, the portion of the funnel over which the deflection yoke is mounted is formed such that the power required to generate a deflection field capable of scanning substantially the entire phosphor screen may be reduced.

Abstract: First and second index signal phosphor layers are formed on a phosphor screen that is formed on the inner surface of a face plate. A rear plate is provided with first and second light sensing units for detecting signal lights from the first and second index signal phosphor layers, respectively. Each first light sensing unit includes a first light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each first index signal phosphor layer. Each second light sensing unit includes a second light collecting plate, which radiates absorbing light having a radiation peak wavelength substantially equal to or shorter than the radiation wavelength of each second index signal phosphor layer.

Abstract: A funnel of a cathode ray tube includes a yoke attachment portion on which a deflection yoke is mounted so as to deflect the electron beam emitted from an electron gun along horizontal and vertical axis. At least one cross section of the yoke attachment portion, perpendicular to the tube axis, has an inner contour which is substantially rectangular with four sides. The sides are defined by convexities curved toward the tube axis and each having a peak on the horizontal or vertical axis. The inner contour of the cross section faces the electron beam passage region with a substantially constant gap.

Abstract: A cathode ray tube includes a vacuum envelope having a face plate (1), a continuous phosphor screen (7) formed on the inner surface of the face plate (1), the phosphor screen (7) including a plurality of scanning regions (R1-R15) disposed in rows and column, and a rear plate facing the phosphor screen (7), a scanning arrangement including a plurality of electron guns (15) attached to the rear plate, for individually emitting electron beams toward the phosphor screen, and deflection yokes (16) coupled to corresponding electron guns (15) for deflecting the electron beams. A control section (30) controls the electron guns (15) and the yokes (16) so that one row of the scanning regions is scanned simultaneously while other rows are suppressed.

Abstract: A vacuum envelope includes a flat faceplate and a flat rear plate opposed to the faceplate. A phosphor screen is formed on an inner surface of the faceplate. A plurality of support members are located between the faceplate and the rear plate and bear atmospheric pressure acting on the faceplate and the rear plate. Each support member has first and second support portions. The first support portion is set up on the rear plate and has a proximal end face intimately in contact with the inner surface of the rear plate and a bearing surface substantially parallel to the rear plate. The second support portion is provided between the bearing surface of the first support portion and the faceplate, and has a distal end abutting against a predetermined position on the inner surface of the faceplate and a proximal end portion intimately in contact with the bearing surface of the first support portion.

Abstract: This cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a funnel formed contiguous to the panel, and a cylindrical neck formed contiguous to the small-diameter end portion of the funnel, an electron gun assembly disposed in the neck to generate electron beams, and a deflection yoke mounted on the outer side of the funnel near the neck side over a predetermined range to form a magnetic field in the funnel, thereby deflecting the electron beams along the major and minor axes of the panel. Of the predetermined range of the funnel, at the neck side, the funnel is formed to have an outer shape with a section which is gradually deformed, from the neck side to the panel side, from a circular shape to a non-circular shape having a maximum diameter along a direction other than the major and minor axes. The funnel of the predetermined range is formed to have an outer shape with a section that satisfies a relation:0.3.ltoreq..DELTA.HV/L.ltoreq.0.

Abstract: A color cathode-ray tube comprises a phosphor screen formed on an inner surface of a face plate and having a plurality of three-color phosphor layers. A plurality of first index phosphor layers are provided on the phosphor screen and extending in parallel to the three-color phosphor layers, and a plurality of second index phosphor layers are provided on the phosphor screen and inclined to the three-color phosphor layers at a predetermined angle. Electron guns are provided in an envelope and emit electron beams to the screen section so as to dividedly scan a plurality of regions of the screen section. Photoelectric conversion devices are provided on the envelope and detect first index signals and second index signals generated from the first and second index phosphor layers by scanning of the electron beams, respectively. Deflection devices for deflecting the electron beams are controlled by a controller in response to the detected first and second index signals.

Abstract: In a color cathode ray tube apparatus, a main electron lens unit for converging three in-line electron beams on a phosphor screen is formed of a plurality of electrodes, including at least first, second, and third electrodes, which are arranged from the cathode side toward the phosphor screen. An asymmetric electron lens, which horizontally diverges and vertically converges the electron beams, is formed on the cathode side in a lens effect region of a first electron lens composed of the second and third electrodes, and an asymmetric second electron lens, which has one effect with respect to the horizontal direction of the electron beams and another with respect to the vertical direction, is formed between the first and second electrodes, at the least.

Abstract: A color cathode ray tube apparatus is provided with an electron gun assembly. In the electron gun assembly, three electron beams, which are emitted from cathodes of an in-line arrangement, are accelerated and converged onto a phosphor screen by an electron lens system of the electron gun assembly. The electron lens system is constituted by a plurality of grid electrodes and includes individual electron lenses and a common electron lens. Each of the individual electron lenses has first and second lens powers in horizontal and vertical planes, respectively. Each of the electron beams is diverged in the horizontal plane and converged in the vertical plane by the corresponding individual electron lens due to the first and second lens powers. The common electron lens has third and forth lens powers in the horizontal and vertical planes, respectively.

Abstract: A color cathode-ray tube comprises an envelope having rectangular flat face and rear plates opposing each other. A phosphor screen is formed on an inner surface of the face plate. Mask support members are mounted on an inner surface of the rear plate. A shadow mask is arranged in the envelope and supported by the mask support members to face the phosphor screen at a predetermined distance. A plurality of positioning posts are fixed on the inner surface of the rear plate and extend toward the face plate. A plurality of positioning pins extend from the inner surface of the face plate and engage the positioning posts so as to position the face plate at a predetermined position with respect to the rear plate. The shadow mask has setting openings through which the positioning posts extend so as to position the shadow mask at a predetermined position with respect to the rear plate.

Abstract: A picture apparatus includes a vacuum envelope which has a phosphor screen and a plurality of electron gun assemblies for emitting electron beams to the phosphor screen, and a deflection device for deflecting the electron beams emitted from the electron gun assemblies. The deflection device has a plate-like coupling member arranged to face the vacuum envelope, and a plurality of elemental deflection units for deflecting the electron beams to scan the phosphor screen dividedly. The deflection units are fixed to the coupling member and located at predetermined positions, respectively.

Abstract: In a color cathode ray tube apparatus including an electron gun assembly having a main electron lens section for focusing and converging three electron beams arranged in a line on a phosphor screen, three electron beam through holes arranged in a line in the arrangement direction of the three electron beams are formed in each of the opposing surfaces of the first electrode having a relatively low potential and a second electrode having a relatively high potential, which electrodes constitute the main electron lens and substantially oppose, the pair of side beam through holes of the second electrode are decentered outward in the arrangement direction of the three electron beams with respect to the pair of side beam through holes of the first electrode, and each of the pair of side beam through holes of any one of the first and second electrodes is formed to have a substantially horizontally elongated shape in which both sides in the arrangement direction of the three electron beams are constituted by arcs and

Abstract: A color cathode-ray tube comprises an envelope having rectangular flat face and rear plates opposing each other. A phosphor screen is formed on an inner surface of the face plate. Mask support members are mounted on an inner surface of the rear plate. A shadow mask is arranged in the envelope and supported by the mask support members to face the phosphor screen at a predetermined distance. A plurality of positioning posts are fixed on the inner surface of the rear plate and extend toward the face plate. A plurality of positioning pins extend from the inner surface of the face plate and engage the positioning posts so as to position the face plate at a predetermined position with respect to the rear plate. The shadow mask has setting openings through which the positioning posts extend so as to position the shadow mask at a predetermined position with respect to the rear plate.

Abstract: A picture apparatus includes a vacuum envelope which has a phosphor screen and a plurality of electron gun assemblies for emitting electron beams to the phosphor screen, and a deflection device for deflecting the electron beams emitted from the electron gun assemblies. The deflection device has a plate-like coupling member arranged to face the vacuum envelope, and a plurality of elemental deflection units for deflecting the electron beams to scan the phosphor screen dividedly. The deflection units are fixed to the coupling member and located at predetermined positions, respectively.

Abstract: In a color cathode ray tube apparatus wherein three in-line electron beams are deflected by horizontal and vertical deflection magnetic fields of a deflector. The three in-line electron beams are arranged along an axis that is inclined with respect to a horizontal axis perpendicular to the tube axis and are emitted from an electron beam producing unit. Of the three electron beams, the center beam is focused at a higher degree than the pair of side beams by an electric field lens forming unit. The pair of side beams are deflected by a deflecting unit in the direction of arrangement of the three electron beams away from the center beam and are made incident on a focusing magnetic field generating device constituting a common magnetic field focusing type electron lens for focusing and converging the three electron beams. Then, the three electron beams are directed to a phosphor screen. Accordingly, the electron beams are desirably focused and converged on the phosphor screen with a small beam spot size.

Abstract: In a color picture tube apparatus having a first auxiliary deflecting means for deflecting a single electron beam, emitted from a cathode, in a direction to separate from the tube axis in synchronism with switching among a plurality of video signals supplied to an electron gun, and splitting the single electron beam substantially into a plurality of beam segments, and a second auxiliary deflecting means, disposed between the first auxiliary deflecting means and a main deflecting unit, for deflecting the plurality of beam segments in a direction to come close to the tube axis, the first auxiliary deflecting means is constituted by an electrostatic deflecting lens provided to an accelerating electrode system between a control electrode and a focusing electrode of the electron gun, and the second auxiliary deflecting means is constituted by a main electron lens of the electron gun for finally focusing the electron beam segments on a phosphor screen.

Abstract: Disclosed is a color cathode ray tube equipped with a main electronic lens section for focusing a plurality of in-line electron beams on a screen section. The main electronic lens section includes a plurality of grids each having electron-beam through holes and securely supported by a plurality of insulating supports. At least one of the grids has a rectangular cup portion with a substantially rectangular cross section for commonly enclosing the plurality of in-line electron beams and a face having electron-beam through holes formed at least at one end and substantially perpendicular to the rectangular cup portion. The ratio of an outside diameter L.sub.H of the substantially rectangular portion in a long-axial direction to an outside length L.sub.S thereof in a short-axial direction, L.sub.H /L.sub.S, is set to 2.5<L.sub.H /L.sub.S <4.4, and the ratio of the outside length L.sub.S to a diameter D.sub.V of the electron-beam through holes in the same short-axial direction, L.sub.S /D.sub.V, is set to 1.

Abstract: In a color cathode ray tube apparatus including an electron gun assembly having a main electron lens section constituted by a plurality of electrodes for focusing three electron beams arranged in a line on a target and a deflection unit for deflecting the three electron beams, at least an electrode to which a voltage obtained by superposing a variable voltage changed in accordance with a deflection amount of the electron beams on a predetermined DC voltage and an electrode which substantially opposes the electrode and to which a voltage obtained by superposing a variable voltage induced through a capacitance between the opposing electrodes on a predetermined voltage applied through a resistor arranged in a tube is applied are arranged in a main electron lens section, and the main electron lens section is made into an electron lens for changing the focusing state of the electron beams in synchronism with deflection of the electron beams.

Abstract: In an electron gun for a cathode-ray tube according to this invention, a quadrupole lens having a small spherical aberration and an asymmetrical lens are combined to properly focus an electron beam, thereby greatly reducing the size of a beam spot formed on a target on a screen.

Abstract: A color cathode ray tube comprises a vacuum envelope including a substantially rectangular faceplate having a first axis and a second axis perpendicular to the first axis and a plurality of necks opposing to the faceplate. A plurality of electron gun assemblies are received in the necks respectively. A phosphor screen is formed on the inner surface of the faceplate and includes a plurality of continuous segment regions scanned with electron beams emitted from corresponding ones of the assemblies. The mask member is received in the vacuum envelope and has a plurality of effective regions through which the electron beam pass. A plurality of effective regions are formed into a plurality of groups.