• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electron gun, especially for use in color picture tubes, comprises in the order named: a cathode, an apertured- plate control grid (G1), an apertured- plate screen grid (G2), and at least two tubular focusing electrodes (G3 and G4). The quality of the gun's beam spot may be improved by (1) Establishing an operating electric field between the G2 and G3 which is between about 100 and 400 volts/mil (3937-15748 volts/mm), thereby reducing aberration effects in the beam-forming region of the gun; (2) Making G2 thick so as to prevent the high G3 voltage from penetrating the region between the G1 and G2, thereby allowing the G1-G2 field to provide a divergent effect on the electron beam prior to beam crossover and thus give a reduced crossover angle; (3) Elongating G3 to provide an optimum filling of the main focus lens with the beam to maximize the object distance of the focusing system; and (4) Structuring G2 and G3 to provide a flat electrostatic field therebetween to avoid prefocusing action in that region, so as not to cause an effective reduction of the object distance of the focusing system. The electron optics, and aberrational effects countered, are detailed. Dimensions and electric potentials are given, and alternative G2 constructions described (Figures 10,11 not shown). Magnetic members 46 correct coma. Guns may be in-line or delta array, and of uni-, bi-, or tripotential lens construction. <IMAGE>
    公开号:SU1722254A3
    申请号:SU792748999
    申请日:1979-04-11
    公开日:1992-03-23
    发明作者:Генри Хьюз Ричард；Чен Хсинг-Яо
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    4Ui A- X1 -----} - f
    fr nT t- --4-4 - H Ts.r, U
    ---} - f
    -4-4 - H „„ L U
    7 figure 1
    vi
    S hO S 01 4
     S
    The invention relates to electron-optical devices of kinescopes and can be used in the development of television receivers with a high degree of image brightness.
    The aim of the invention is to increase the current density of electrons in the spot while reducing the size of the spot.
    Figure 1 shows the general scheme of a kinescope containing an electron gun; in figure 2
    - e-gun design; on fig.Z
    -the region of the formation of the electron beam; figure 4 - dependence of yr-la divergence ft of the electron beam at the exit of the crossover; Figures 5 and 6 show possible embodiments of the screen grid electrode.
    The electron gun contains a cathode 1 and successively located control grid electrode 2, screen screen electrode 3, first focusing electrode A and second focusing electrode 5. The electron beam forming region 6 is located to the left of electrode 3, the focusing region of the electron beam 7 is located to the right of electrode 3, the dotted line indicates the electron beam envelope, which starts at cathode 1 and ends at screen 8. Figure 1 also shows the input and output angles of the beam envelope in its edge. Ossovere. In practical designs, all elements of the electron-optical system of the gun are located inside the sealed glass case 9, which also functions as an insulator between the electrodes. The screen grid electrode 3 can be made both solid and consisting of several parts 10 and 11.
    The electron gun works as follows
    The cathode heating is turned on and accelerating potentials are supplied between cathode 1 and electrodes 2-5, the possible values of which are shown in Fig. 2. The electrons coming out of the cathode are accelerated and are formed into a beam by the system of cathode 1 and electrodes 2-5 and are focused as a spot on the screen 8. creating an optical image on it. A distinctive feature of this electron gun is the ratio of the dimensions between the lengths of the electrodes and the sizes of the holes in them, which ensures a small spot size on the screen 8 in combination with a high current density. This provides high brightness and image focusing. From the graph in figure 4 it can be seen that the angle of divergence of the beam goes beyond 0.04-0.07 rad. at selected ratios between the lengths and dimensions of the holes in the electrodes. The small angle value /, in turn, provides the spot dimensions on the screen 8.
    Fig. 3 shows the calculated shape of the equipotentials and the shape of the electron trajectories passing through the holes in the electrodes.
    0 The absolute dimensions and potentials of the electrodes of one of the practical versions of the electron gun in accordance with the symbols in FIG. 3 are as follows: 5 Distance a between cathode 1 and electrode 2 mm0.076 Electrode Length b 2..MM0.127 0 Diameter apertures
    from electrode 2, mm0,635
    Distance d between electrodes 2 and 3, mm 0.279 Length e of electrode
    5 3, mm 0,508
    The diameter of the aperture f of the electrode 3, mm0,635
    Distance g between electrodes 3 and 4, mm 0.838 0 Aperture diameter h
    electrode 4, mm1,524
    Electrode Length
    4, mm23,495 Diameter of the electrode
    5 4, mm5,436
    Electrode Diameter
    5, mm5,766 The distance between the electrodes 4 and 5, mm 1,270
    0 Potential lock out
    the cathode. B150
    Electrode potential 2, VO
    Electrode potential 5 3. В625
    Electrode potential 4, B8500
    Electrode potential 5, B30000
    0 When choosing the dimensions of the electrodes of this gun, the relationship between the course of the electron trajectory in regions 6 and 7 was taken into account due to the overlapping fields in the region of the beam crossover from cathode 1 and electrodes 2-4, which 5 provided an improved image quality compared to the known device.
    权利要求:
    Claims (1)
    [1]
    Claims. Electron gun containing successively located behind the cathode
    control grid electrode and screen grid electrode, made in the form of discs with holes on the axis, as well as the first and second focusing electrodes of tubular form, from which, in order to increase the current density of electrons in the spot, while reducing the spot grid electrode is made with a ratio of its length to the hole diameter in the range of 0.4-1.0, the first focusing electrode is made in the ratio of its length to the internal diameter of the pipe in the range of 2.5-5.0, and the distance between these electrodes is 0.78- 3.15 of the diameter of the hole in the screen grid electrode.
    FIG. 2
    FIG. J
    Y2 OL 0.6
    Yu P
    FIG. five
    0
    Yu
    FIG. 6
    类似技术:
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    US4961022A|1990-10-02|Display tube including a helical focusing lens with a non-rotationally symmetrical lens element
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    US4368405A|1983-01-11|Electron gun for a cathode ray tube
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    同族专利:
    公开号 | 公开日
    AU4515779A|1979-10-18|
    DD143125A5|1980-07-30|
    MX4332E|1982-03-25|
    IT7921663D0|1979-04-06|
    FI791127A|1979-10-13|
    PL214828A1|1980-05-05|
    NL7902868A|1979-10-16|
    DE2914838A1|1979-10-18|
    IT1112465B|1986-01-13|
    ES479316A1|1979-06-16|
    BE875443A|1979-07-31|
    FR2423057B1|1984-03-02|
    BR7902199A|1979-12-04|
    GB2020092A|1979-11-07|
    PL126827B1|1983-09-30|
    CZ278259B6|1993-11-17|
    NL189323B|1992-10-01|
    HK59887A|1987-08-21|
    DE2914838C2|1986-11-06|
    JPH0419660B2|1992-03-31|
    GB2020092B|1983-01-06|
    CZ246779A3|1993-06-16|
    JPS54145472A|1979-11-13|
    CA1138519A|1982-12-28|
    FR2423057A1|1979-11-09|
    NL189323C|1993-03-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1156511B|1957-10-28|1963-10-31|Rauland Corp|Beam generation system for a cathode-modulated cathode ray tube|
    US3090882A|1960-04-13|1963-05-21|Rca Corp|Electron gun|
    US3295001A|1963-06-04|1966-12-27|Sylvania Electric Prod|Cathode ray tube gun having a second grid with an effective thickness|
    US3374379A|1964-03-02|1968-03-19|Nippon Columbia|Low second grid voltage electron gun|
    BE793992A|1972-01-14|1973-05-02|Rca Corp|CATHODIC RAY TUBE|
    JPS5522906B2|1974-05-20|1980-06-19|
    US3995194A|1974-08-02|1976-11-30|Zenith Radio Corporation|Electron gun having an extended field electrostatic focus lens|US4234814A|1978-09-25|1980-11-18|Rca Corporation|Electron gun with astigmatic flare-reducing beam forming region|
    US4498028A|1981-09-28|1985-02-05|Zenith Electronics Corporation|Ultra-short LoBi electron gun for very short cathode ray tubes|
    US4529910A|1982-03-31|1985-07-16|Zenith Electronics Corporation|High-performance electron gun|
    NL8204185A|1982-10-29|1984-05-16|Philips Nv|CATHED BEAM TUBE.|
    JPH0132623B2|1983-02-14|1989-07-07|Matsushita Electronics Corp|
    EP0237005A3|1986-03-11|1988-10-12|Matsushita Electronics Corporation|Cathode ray tube for color display|
    FR2724048B1|1994-08-26|1997-01-10|Thomson Tubes & Displays|COPLANAR ELECTRONIC CANNON WITH IMPROVED BEAM FORMATION ZONE|
    JP2000243218A|1999-02-17|2000-09-08|Nec Corp|Electron emitting device and its drive method therefor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US89558878A| true| 1978-04-12|1978-04-12|
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