• 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:
    The gun, for use in a television picture tube, comprises a cathode, an apertured control grid, and an apertured screen grid aligned in the order named. The screen grid aperture comprises a rectangular slot portion facing the control grid and a circular portion facing away from the control grid. The slot portion of the aperture, which has a width 2-5 times its depth, creates an astigmatic field that produces underconvergence of the electron beam in the vertical plane only, whereby to avoid and/or compensate for vertical flare distortion of the beam spot at off-center positions on the image screen.
    公开号:SU1074422A3
    申请号:SU792819252
    申请日:1979-09-24
    公开日:1984-02-15
    发明作者:Чен Хсинг-Яо；Генри Хьюс Ричард
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to cathode ray color image tubes for household television receivers / and can be used, in particular, in tubes using the x combination of a self-combining reflector system with a shadow mask and having multibeam electron guns arranged in a horizontal plane along a single line ( in. tine.) I an apertured mask with vertically arranged apertures of a slit mold and a screen with vertically oriented phosphor strips, as well as in tubes with a shadow mask of a stroke type a and index tubes. A known electron gun is designed to create at least two, preferably three, electron beams in a common plane and their direction along convergent trajectories before they converge into a small spot screen. The self-converging deflecting system has field irregularities that ensure the convergence of the rays without the means specifically designed for this, l The main direction in the development of color image tubes is the creation of shorter tubes with larger deflection angles. It was found that for tubes with a deflection angle of the EUT, there is a significant distortion of the rays when deployed towards the edge of the screen. These flare-like distortions appear as unwanted tails or low-intensity spots located near the useful spot. The mentioned distortions arise due to the effect of the edge regions of the deflecting field on the beams during their passage through the electron gun and because of the non-uniformity of the deflecting field itself. If the deflecting field captures the region of the electron gun, which is usually the case, the rays may deviate slightly from the axis, hitting the region of the larger deflection of the electron lens. As a result, an illumination occurs near the useful spot, located near it from the center of the screen. This phenomenon, for example, takes place in a self-converting deflection system with a toroidal vertical coil due to the relatively large edge field of the toroidal coils. Self-converting deflection systems have an inhomogeneous field so that the beam deflection increases as the horizontal deflection angle increases. This heterogeneity also causes the vertical deflection of the electrons inside each individual beam; Thus, the rays deviate excessively and fall into points shifted in the horizontal plane from the center of the screen, which is the cause of the vertical illumination observed both above and below the spot. Vertical illumination, arising from both the edge field of the deflecting system and the field of the electron gun, and the inhomogeneity of the field itself, leads to a decrease in the quality of reproduction on the screen. The closest to the proposed technical solution is the electron gun containing a sequentially located cathode, a control electrode, a screen grid and at least one focusing electrode, the screen grid having a flat part in which a hole for passing a beam is made, having a distinct form on the side of the control and focusing electrodes 2. In the known -conference of the gun, a hole in the screen grid is formed by two slits, which allows correcting the 5-shaped distortion of the vertically elongated spot of the beam e) without its horizontal expansion, but does not allow to reduce the diffuse halo. The purpose of this invention is to reduce the diffuse halo of an electron beam. This goal is achieved by the fact that in an electric gun containing successively located cathode 7 control electrodes, a screen grid and at least one focusing electrode, moreover, the screen grid has a flat part in which a hole for passage of the beam is made, which has a different shape the side of the control and focusing electrodes, the hole in the screen grid on the side of the control electrode is made in the form, and on the side of the focusing electrode - cylindrical, with the ratio of the slit width to e depth is 2-5, and glubicha tsilivdrit Cesky holes and cracks is 0,24-0,8 0,4-1 and respectively from the cylindrical opening diameter. The beam formation hole in the screen electrode preferably has a circular cross section. The circular shape of the cross-section of the hole is more expedient, since the most desirable form of the spot of the electron beam is circular. In accordance with this, it is desirable to have a small astigmatism in the BisecTH beam forming area so as to eliminate undesirable illumination of the electron beam spot without distorting the main beam rod and, therefore, a round spot shape. If the beam-forming opening has a shape other than a round one, then this may simultaneously with a decrease in the illumination undesirable affect the spot shape. In order to obtain the desired astigmatic effect in the field of beam formation, the width of the slit in the screen grid (E) should be 2-5 times its depth. When the lower limit is exceeded, the deflecting effect of the electric field lines is so strong that the beam becomes ascending and its formation is difficult. When it exceeds the upper limit, the astigmatic effect of the slit on the formation of the beam is reduced and to reduce the diffuse: the beam on the screen does not work. Experimentally established that if the depth of the slit is more than 0.8 mm and the orifice in the screen grid, the beam focusing quality deteriorates and the gun cannot be used to form an image on the screen. For a gun with a hole diameter in the screen grid, for example, mm, the depth of the slit should be no more than 0.508 mm. But the depth of the gap should not be too small, as it is related to the width of the gap. With a decrease in the depth of the slit is less than 0.24 of the diameter of the hole in the screen grid, the width of the slit can be less than 0.48 of the hole diameter. Experiments have shown that when 1 is reduced and this ratio is critical, the accuracy of centering the target and the hole becomes critical. Therefore, for example, with a diy hole in the screen grid of 0.635 mm, the depth of the slit must be at least 0.152 mm and the width of the slit is at least 0.304 mm. It was established experimentally that the total thickness of the screen grid should be 1.2 hole diameter in the same grid. At this ratio, the effect of reducing the diffuse beam from the eola is maximum. Based on this ratio and taking into account the previously introduced | 1st relationships, the depth of the hole in the screen electrode should be 0.4–1 from its opening. FIG. 1 is a diagram of a cathode ray tube with an electron gun; FIG. 2 is one of the variants of the electron gun, the longitudinal section in FIG. 3 .- an enlarged cross-section of the screen electrode in FIG. 2, in FIG. 4, and the races A-A in FIG. 3 | f in FIG. 1 5, section BB in FIG. four; in fig. 6 is a section on BB in FIG. 4. The rectangular tube 1 of the color image has a glass cylinder two-sided rectangular ontual panel 2 and a tubular neck 3 connected by a rectangular bell 4; Panel 2 consists of a front glass 5 and a peripheral side wall 6 connected to the socket 4, 7, 7. A mosaic phosphoric three-color screen 8 is located on the inner surface of the front glass 5. Electrode 9 of a multi-aperture shadow mask of a slit type with separation of colors is movably installed in the usual way a predetermined position relative to the screen 8. The combined electron gun 10 (shown by dotted lines is set in the center of the inner neck 3 and is designed to create three electron beams 11, Kaplanarnami trajectories through a mask (electrode 9) to the screen 8. This tube is designed for use with an external magnetic deflecting system 12 located around the depth of mouth 3 and the socket 4 near the point of their connection to ensure the horizontal and vertical scanning of the three electrons. rays 11 on the screen 8. The electron gun 10 of the bipotential type consists of two glass supporting: rods 13, on which are mounted the various electrodes: three equidistant caplanar cathodes 14 (each of the cathodes of Designed for a single beam, in FIG. 2 shows only one), an electrode 15 controlling the grid, an electrode 16 of the screen grid focusing the electrode 17 (first lens), focusing the electrode 18 (second lens). The electrode 18 includes a shielding cup 19. All electrodes are mounted along the central axis of the beam and are located along the glass rods 13 in the order named. The focusing electrodes 17 and 18 also serve as an accelerator in the hypotential gun 10. Magnetic elements 20 are mounted at the bottom of the shield cup 19 to perform x-ray correction of the raster when deploying electron beams across the screen 8.. I On the end wall of the tubular cathode 14 there is a flat emitting surface 21. The electrodes 15 and 16 have rionepe4Hbie plates 22 and 23, respectively, with centered holes 24 and 25. The hole 25 of the electrode 16 is a compacted hole. The electrode 17 is an elongated tubular element, the transverse walls 26 of which are located in the immediate vicinity of the electrode 1b, which has an opening 27. The electrode 18, like 17, consists of a tubular element. Both of these elements have tubular, inward-facing lips 28 and 29, which are created by the main focusing of the electron gun. The transverse plate 23 of the electrode 16, COCTCHIT has two parts: the first 30 jH and the second 31 separate plates. The first separate plate has an opening 32, which is preferably made circular. The second separate plate 31 is abutted against the surface of the first plate. Tina 30 on the side facing the electrode 15. On the trough plate 3 there is a longitudinal slot 33 of a rectangular shape located along the axis of delivery with a hole 32 in the first one. plate 30. The three-beam gun has three holes 32 in the first layer 30 and three corresponding rectangular slits 33 in the second plate 31. The hole 32 with the rectangular slit 33 constitutes the composite tip 25 of the formation of an electron beam in the screen electrode. The second plate 31- (Fig. 4) has three separate rectangular slit holes 32, but if necessary they can be made as one slit hole passing through the three holes 32. The length of the slit 33 is not critical at Provided that it is sufficiently large, so as not to exert a significant influence on the electron beams in the horizontal direction, the first and second plates can be made as separate connecting. each other elements (FIG as well as two parts of the same electrode. In this case, the rectangular slot 33 should have a depth less than the total thickness of the transverse plate 23, and the hole 32, beginning where the slot 33 ends, is located on the remaining transverse thickness plates 23. In accordance with the invention, an electron gun consists of a beam-forming area including a cathode, a control grid and a screen grid. The screen grid has a slot located on the side of the grid due to which an astigmatic electric field occurs, Cause incomplete convergence of the electron beam in one plane, for example, vertical, compared to beam convergence in a plane perpendicular to the first. As a result, the vertical deflection rays fall into the zone of a smaller gun electron lens, which compensates for excessive deflection caused by the saw deflecting system at points horizontally distant from the center of the screen. Both of these phenomena reduce the vertical light of the electron beam at points horizontally distant from the center of the screen. The proposed device operates as follows. The electrons emitted by the cathode are focused in the direction of their point of intersection by a symmetric electric field with converging power lines 34 which capture the opening of electrode 15. The astigmatic electric field is present and from the entrance of the beam to answer 25 of electrode 16 (Fig. 5 and 6 ). The effect of this file on converging electron rays in the horizontal plane is different compared to the effect it has on converging rays in the vertical plane. Diluting power lines 35 of this astigmatic field, which are in the horizontal plane, slightly bend the electron beam, thus providing a relatively small intersection angle (Fig. 5). The trajectories of the electrons (Fig. 5) are the trajectories of the outermost rays 36 in the horizontal plane. The power spreading lines of the 37astigmatic field in the vertical direction are more steeply curved and have a greater effect on the flow of electrons, including force 35 (Fig. 6). As a result, the most distant rays from the center 38 in the vertical plane are subject to greater straightening and, consequently, the intersection The rays occur at large angles at a point located much farther than the intersection of the horizontal rays (Fig. 5). Thus, there is a double intersection of the rays, when horizontally converging rays intersect at point 39, and vertically converging rays - at point 40, located much further. The composite beam includes horizontally converging rays that are focused in a line or an extended point on the screen of the tube, while vertically converging rays are under-focused and converge in a line or an extended point outside the screen. An electron beam appears in the center of the screen, the vertical size of which is larger than the horizontal because of the under-focusing of the vertical rays. Although the spot of the electron beam in the center of the screen has a vertical size, a larger horizontal one, the opposite pattern takes place for the cross section of the beam when the latter passes through the main focusing device of the electron beam of the electron gun. In this case, due to lower angles, in the vertical plane of the plane, the electron beam has a vertical size smaller than the horizontal one. As a result, any deviation of the axis beam under the action of the edge field of the vertical axis of the system in the vertical direction does not significantly affect the ray, since the latter is not completely i in the deflecting part of the lens. So I 6 times 1,. The phenomenon of vertical illumination due to the marginal field of the deflection of the system kipes weakens. In addition, since dl. the composition of the beam is characteristic {whalen convergence in the vertical plane; to the pension, the excess deviation in the tical plane under the action of the deflection field. Accordingly, the vertical illumination, both above and below the electron beam in the peripheral part of the screen, is significantly reduced. . Below are the dimensions and parameters of the proposed electron gun (option) Distance cathode-electrode 15 (hot) Electrode thickness 15 Dia1: electrode hole 15 Distance between electrodes 15.16 Thickness of plate 30 of electrode 16 20 0,508 Thickness of plate 31 of electrode 16 . 8 - 0.203 The diameter of the hole 32 elactror .; . yes 1625 0.635 Electrode gap width 16 28 0.711 Electrode gap length 16 84 2.134 distance between electrodes 1 € -17.33.: 0.838 Hole diameter 27 of electrode 17.601,524 Electrode length 17 925 23,495 Diameter of electrode electrode 17 214. 5.436 Diameter of the electrode lens 18. 227 6,766 Distance between electrodes. 17-18. 50 1,270 Cathode latching potential ISO Electrode potential 15.8O Electrode potential 16, B600 Electrode potential 17, B8500 Electrode potential 18, B 30000 The proposed gun ensures the diffusion of a diffused halo spot of the ktron beam.
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    权利要求:
    Claims (2)
    [1]
    ELECTRON GUN, containing sequentially located conductors, a control electrode, a screen grid and at least one focusing electrode, the screen grid having a flat part in which a hole for the passage of the beam is made, having a different shape from the side of the control and focusing electrodes *, o ' The key point is that, in order to reduce the diffusion halo of the electron beam spot, the hole in the screen grid from the side of the control electrode is made in the form of a gap, and from the side of the focusing electrode evenly, in this case, the ratio of the width of the gap to its depth is
    [2]
    2-5, and the depth of the cylindrical hole and the gap is 0.4-1 and 0.240.8, respectively: from the diameter of the cylindrical hole.
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    引用文献:
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    US4558253A|1983-04-18|1985-12-10|Rca Corporation|Color picture tube having an inline electron gun with asymmetric focusing lens|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/945,600|US4234814A|1978-09-25|1978-09-25|Electron gun with astigmatic flare-reducing beam forming region|
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