Abstract:
Electron gun for cathode ray tube comprising aligned in series along an axis XX′ an electron-emitting cathode K, electrodes G1 and G2 for the formation of an electron beam, a prefocusing electron lens G3, G4, G5, a first quadripolar device G7, G8 electrically controlled in a dynamic manner in synchronism with the screen scan so as to correct beam focusing defects at the screen edge, a main electron lens G8–G9 making it possible to focus the electron beam onto a screen.It also comprises a second quadripolar device G5, G6, G7situated between the prefocusing electron lens G3, G4 and the first quadripolar device and comprising electrodes G5, G6, G7exhibiting rectangular apertures. Those of G5 and G7 are parallel and those of G6 are orthogonal to those of G5 and G7.The electrodes G5 and G7 are placed at a fixed polarization potential, and the electrode G6 is at a polarization potential varying in synchronism with the screen scan.
Abstract:
An electron gun for a cathode ray tube is disclosed, which has a simple structure and can prevent the spot on a screen from being degraded. In the electron gun for a cathode ray tube including a cathode that emits electron beams, a first electrode that controls the electron beams emitted from the cathode, a second electrode that accelerates the electron beams emitted from the first electrode, and third to fifth electrodes sequentially arranged in a screen direction to act as pre-focus lenses, the electron gun is characterized in that the third to fifth electrodes have different sized electron beam through holes.
Abstract:
A prefocus lens section in an electron gun assembly includes a second grid that is disposed on an electron beam generating section side, a third grid that is disposed on a main lens section side, and a shield grid that is disposed between the second grid and the third grid. The shield grid is a cup-shaped electrode with a side wall that surrounds an outer peripheral part of the third grid, which part is located on the second grid side, and extends in parallel to a tube axis. The shield grid has a bottom surface disposed to face the second grid and has an open end disposed to face the third grid. A relationship, Ec
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. The in-line type electron gun is configured such that a relationship B
Abstract:
An electron gun for a cathode ray tube comprises a triode including a cathode, a control electrode and an accelerating electrode, a pre-focusing electrode unit adjacent to the triode, a main lens unit including a focusing electrode and an anode for forming a main lens for focusing the electron beam toward a screen, a first focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, a second focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, and an auxiliary electrode disposed between the first focusing electrode unit and the second focusing electrode unit, to which a dynamic voltage is applied, and including vertically-elongated electron beam passing holes on electron beam incoming side thereof and horizontally-elongated electron beam passing holes on electron beam outgoing side thereof.
Abstract:
The invention relates to a cathode ray tube having an electron gun oriented along an axis (Z), comprising a quadrupolar device which comprises three electrodes (5, 6, 7). Each electrode possesses a central aperture, a right lateral aperture and a left lateral aperture all three substantially rectangular. The centres (c5.1, c7.1) of the central apertures of the three electrodes are aligned along the axis (Z) of the gun. The centres (c6.1, c6.3) of the left and right lateral apertures of the second electrode (6) are situated along respectively a first axis (z1) and a second axis (z3) that are parallel to the axis (Z) of the gun. The centres (c5.1, c7.1) of the left and right lateral apertures (5.1, 5.3, 7.1, 7.3) of the first and/or of the third electrode (5,7) are offset with respect to the axes (z1, z3) passing through the centres of the apertures of the second electrode. Such an arrangement makes it possible to correct the MODEC defects.
Abstract:
A display device comprising a deflection unit and a cathode ray tube having an in-line electron gun. The electron gun comprises a main lens portion having means for generating a main lens field and an auxiliary field. Furthermore, the electron gun comprises a prefocusing lens portion having a first, a second and a third electrode for generating a prefocusing lens field. In operation, in a direction perpendicular to the in-line plane, the auxiliary field and the main lens cause the electron beam to leave the main lens substantially parallel to the in-line plane, whereby the diameter of the electron beam at a gap of the main lens at the anode side is smaller than or equal to the diameter of the aperture of the second electrode throughout the deflecton of the electron beam across the display screen. By virtue thereof, an improved picture reproduction can be obtained.
Abstract:
An electron gun for a color cathode ray tube includes a cathode which is a source for emitting an electron beam, a control electrode, through which the electron beam emitted from the cathode passes, having first electron beam passing holes each including a first vertically elongated indented portion formed at an output side surface of the control electrode and a first electron beam passing hole portion formed in the first indented portion, a screen electrode installed adjacent to the control electrode and having second electron beam passing holes formed in the screen electrode, a plurality of focusing electrodes for forming a plurality of quadrupole lenses, sequentially installed from the screen electrode and respectively having electron beam passing holes having a predetermined shape.
Abstract:
A prefocus lens section is formed by a screen electrode and an additional electrode. A main lens section is formed by a focus electrode, an anode electrode and an intermediate electrode that is disposed between the focus electrode and the anode electrode. Each of the focus electrode and the intermediate electrode has a cylindrical electrode on at least one of opposed faces thereof. The intermediate electrode and the anode electrode have cylindrical electrodes on opposed faces thereof. A voltage with a level higher than a focus voltage and lower than an anode voltage is applied to the additional electrode and the intermediate electrode.
Abstract:
Disclosed is a cathode ray tube with an electron gun capable of improving a resolution of an image by preventing electron beams from striking electrodes and efficiently controlling a spot size that is susceptible to a change in current capacity.