Colour cathode-ray tube

专利摘要:
A color CRT has an inline electron gun for generating and directing three electron beams toward a screen, the gun including a main focus lens formed by two spaced electrodes (40, 42) each having three separate inline apertures (58,60,62;64,66,68) and a peripheral rim (70,72), the apertured portion of each electrode being within a recess (54,56) set back from the rim, 15 wherein the main focus lens electrode (42) closest to the screen includes a slot (95) e.g. formed by two strips (96,98), on the side facing the screen, the slot extending in the direction of the three electron beam paths and includes means for providing a weaker stigmator effect on the two side beams than on the center beam. As shown in Figure 5 the ends of the strips (96, 98) may be tapered, or curved or the strips shortened, to provide the weaker stigmator effect. Alternatively, Figures 9 and 10 (not shown), the slot is dogboned in shape and located in a bracket (102) attached to an apertured plate (52), in turn attached to the screen side of the main focus lens electrode closest to the screen. <IMAGE>
公开号:SU1347873A3
申请号:SU823461891
申请日:1982-07-09
公开日:1987-10-23
发明作者:Чен Хсинг-Яо；Генри Хьюес Ричард
申请人:Рка Корпорейшн (Фирма)；
IPC主号:

专利说明:

The invention relates to a color television technology and can be used to create a tube with a coplanar electronic searchlight, in particular a searchlight with an extended focal lens.
The purpose of the invention is to improve the image quality by reducing the spherical aberration of the focal lens.
Fig. 1 shows a mask receiving television tube, a slit; in fig. 2 shows an electronic searchlight represented by dotted li} 1 and mi in FIG. 1, the cut; in fig. 3 shows a grid screen and a second accelerating and fixing electrodes of a 3JieKTpoinioro searchlight, a section; FIG. 4 shows an electronic searchlight, section A-A in FIG. 3; in fig. 5 shows the second accelerating and f focusing electrode of the electronic spotlight, section BB in FIG. 2, (showing an embodiment of the sigmator); in fig. 6 p 7 is the second accelerating focusing electrode of the electronic spotlight shown in FIG. 2 implementing two other embodiments of the stigma tor; on phpg. 8 - for the 1st embodiment of the electronic searchlight, shown by FiHoro with dashed lines in FIG. 1, axial section; in fig. 9 is a grid screen and second acceleration fixing electrodes of the electronic searchlight according to FIG. eight; in fig. 10 is the second accelerating and focusing electrode of the electronic spotlight, section BB in FIG. 8, illustrating the next embodiment of the 1P1 stigmator.
The rectangular color electron tube 1 has a glass flask 2 consisting of a rectangular front panel 3 and a tubular throat 4, which are combined with a rectangular bell 5. The front panel has a front panel 6, a side wall 7 that spas with a socket 5 The mosaic tricolor phosphor screen 8 is arranged on the inner surface of panel 6. In a preferred embodiment, this screen is made lined from phosphor stripes extending perpendicularly to the direction of high-frequency scanning. rows of tube solution (to the plane of FIG. 1). Multi-aperture color separation electrode

0
or the mask is mounted at a certain distance with respect to the screen 8. The komplanar electronic searchlight 9, schematically depicted with dotted lines in FIG. 1 is axially mounted inside the neck 4 and is intended to form and direct three electron beams 10
along coplanar converging trajectories through the mask on screen 8,
The tube 1 is intended for use with an external magnetic deflector coil similar to a coil 11,
5 covering the neck 4 and the bell 5 near the line of their connection. After excitation, the coil 11 acts on the three beams 10 by means of magnetic fields, which force the beams
0 ska 1 horizontally and vertically within a rectangular raster on screen 8. The original deflection plane (with zero deflection) is depicted by the P-P line in FIG. 1 near the middle of the coil 11. Due to the presence of edge fields, the tube deflection zone extends along the axis of the coil 11 into the region of the electronic searchlight 9. In order to simplify the image in FIG. the actual curvature of the paths of the deflected rays in the deflection zone is not shown.
The electronic illuminator (Figs. 2-5) has two supporting glass rods 12 on which a variety of electrodes are mounted. Among them are three equally spaced coplanar cathodes 13 (one for each beam), a grid control electrode 14, a first accelerating and focusing electrode 15, a common screen electrode 16 and a second accelerating and focusing electrode 17 located along the glass rods 12 in specified in order. Each of the electrodes 15-17 has three apertures arranged in a row (on one linip) for the passage of three coplanar electron beams. The main electrical focal lens of the spotlight 9 is formed between the electrode 16 and the electrode 17. The electrode 16 is made of four cup-shaped elements 18-21. The open ends of two of these elements 18 and 19 are fastened to each other, the open ends of two other elements 20 and 21 are also fastened. The closed end of the third element 20 is fastened with the closed end of the second element 19, Although the electrode
0
five
0
five
0
16 is four-step, it can be made of any number of elements, including single elements of equal length. Electrode 17 also has a cup shape and its open end is closed by an aperture (with holes) plate 22.
Facing each other closed
the ends of the electrodes 16 and 17 have great mathism, i.e. asymmetry is valid
The second depressions 23 and 24, respectively The depressions 23 and 24 provide a greater distance from that part of the closed end of the electrode 16, which has three apertures 25-27, from that part of the electrode 17, which has three apertures
28-30. The remaining portions of the closed ends of the electrodes 16 and 17 form slots 31 and 32, respectively, which are located at the periphery of the valleys 23 and 24. The projections 31 and 32 are the closest parts of the two electrodes 16 and 17.
The electronic illuminator 9 (Fig. 2) creates a main focal lens, the spherical aberration of which is significantly reduced in comparison with the known tube. Reduction of spherical aberration was made possible by increasing the size of the main focal lens. This increase in lens size is achieved by drowning the apertures of the electrodes. In the known coplanar electronic projectors, the most powerful equipotential lines of the electrostatic field are concentrated at each pair of opposite apertures. But in electron spotlight 9, the strongest equipotential lines extend continuously between protrusions 31 and 32, so that most of the main focus lens turns out to be a single large lens covering the trajectories of the three electron beams. The rest of the main focal lens is formed by weaker equipotential lines located near the apertures in these electrodes.
As isolated in FIG. 3 and 4, the depths F of the depressions 23 and 24 are approximately one fourth of the distance C between the two straight walls of the depressions. The diameter of each aperture in the electrode 16 is such that it ensures that the equipotential line touches four percent of the electrode voltage, which would exist if the aperture part of this electrode were not present. In this embodiment
making a line corresponding to four percent turns out to be approximately a semi-circle. The gap between the two electrodes 16 and 17 should be chosen to be the smallest in order to prevent static bends from bending the electron beams on the throat. When the tube is working, an astig occurs.

VIA main lens, due to the penetration of the focusing field through the open areas of the depressions. This effect is created by a greater contraction of equipotential diniums along the edges of the focal lens than in two regions near the center of the focal lens. Penetrating the floor makes the focal lens stronger vertically than horizontally. Correction of this stigmatism in the electrically operated projector 9 (Fig. 2) is provided by creating a horizontal slit hole 33 at the exit of the electrode 17. The optimum width luejn 33 is half the diameter of the lens and the gap between it 17 represents 86% of the diameter of the lens. The slit 33 is formed by two strap No. 1 34 and 35 (Fig. 2 and 5), which are welded to the aperture plate 22 of the electrode 17 parallel to the plane of arrangement of the three electron beams.
In order to minimize any focal potential difference between the center and the edges of the electronic searchlight and improve the quality of focusing the side beams, the slit 33 is equipped with a device that creates a less stigmatic effect on the two side beams than on the central beam. This device is carried out by cutting the ends of the slats above the apertures for the lateral rays. These cuts give the slats a trapezoidal shape, with the shorter of the parallel sides of one slat located opposite the similar slice of the other.
In a slightly modified embodiment (FIG. 6), the two parallel stigmator strips 34 and 35 are individually trapezoidal, and the non-parallel sides of these strips are slightly curved. In another embodiment (FIG. 7), cuts 34 and 35 are rectangular, in all cases from 175
The rays of the line of the slice pass on the level of their axes.
In order to ensure the static construction of two side beams with a central beam, the width E of the depression 2A of the electrode 17 is slightly larger than the width D of the cavity 23 and in the electrode 17 (Fig. 3). Some typical dimensions (mm) of an electronic projector 9, shown in FIG. 2, the following: The outer diameter of the neck of the tube, 29.00 The inner diameter of the neck of the tube 24.00 The gap between the electrodes 1 6 and 1 71.27 The distance between the centers of adjacent apertures in the electrode 16 (A in Fig. 3) 5.0 The internal diameter each of the apertures 25-27 in the electrode 16 (B in Fig. 3) 4.0 The distance between the two straight walls of the depressions in the electrodes 16 and 17 (C in FIG. 4) is 7.0 The width of the depression in the electrode 16 (D on Fig. 3) 20.2 The width of the depression in the electrode 17 (E in Fig. 3) 20.8 Depth of the depression in the electrodes 16 and 17 (F in Fig. 3) 1.65 In other embodiments, a coplanar electronic burner ora pit depth in the electrodes 16 and 17 can vary from 1.30 to 2.80 mm, and the depth of the depressions in the two electrodes may be different from each other.
Another variant of the electronic projector is shown in FIG. 8-10. The electronic searchlight is similar to the searchlight 9 (FIGS. 2-5), excluding the introduction of a correction for astigmatism, i.e. to the asymmetrical effect of the main focal Lens due to the penetration of the focusing field through the open areas of the cavities. Correction of this astigmatism in the electronic rogractor 9 (Fig. 8)
E
8736
This is accomplished by adding a horizontal slit hole 36 at the exit of the electrode 17, which acts as an electron beam stigmator. The slot 36 is made in the bracket 37, which is fixed on the plate 22, which in turn is fixed on the screen side of the electrode 17.
Some typical dimensions (mm,) for an electronic projector (FIG. 8) are as follows:
Outside diameter
tube necks 29.00
Inner diameter
mouth of a tube 24,00
The gap between the electrodes 16 and 171.27
The distance between the centers of adjacent apertures in the electrode 17
(A in FIG. 2) 5.00
Inner diameter
apertures 25-27 in
electrode 16 (V to
FIG. 9) 4.00
Spacing between straight sides
dimples
electrodes 16 and 17
(C in FIG. 4) 8.00
Depth width in
electrode 16 (D on
FIG. 9) 18.2
5 cavity width in
electrode 17 (E on
FIG. 9) 18.6
Depth of trench in
electrodes 16 and 17 0
0
five
0
(F in Fig. 9). Dain's stigmator arm (G in Fig. 10)
Width of stigmator bracket (H in Fig. 10) Height of stigmator bracket (I in Fig. 9)
° The length of the gap (J in Fig. 10)
Minimum slot width (K in Fig. 10) Maximum width
5 slit (L in figure 10)
2.03
15.37
7.88
3, 10 13.46 1.52 2.29
A T 2.i
AT
f-
d
BUT

FIG. J
oo
9i2L
6-B
9ag5
(PU2.6
ig.1
aL
22
2B} 7
/ /
ifl
n
2JH
12

26
Sh r
-yy
2 -31
-2 / 20 -f
-IS
-four-
-9 -"
tJ
Compiled V.Aleksandrov Editor V.Danko Tehred M.Didyk Corrector M.Sharoshi
Order 5129/53 Circulation 696. Subscription VNIIPI USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
Production and printing company, Uzhgorod, st. Project, 4
U2.9
U2. iO

权利要求:
Claims (4)
[1]
1. COLORED ELECTRON BEAM TUBE, containing an electronic searchlight with coplanar arrangement of guns for generating three electron beams in the direction of the tube screen, comprising a main focal lens formed by two separate spatial electrodes, each of which is equipped with a peripheral protrusion facing towards the other and having three located in one plane of the aperture, and the electrode closest to the screen has a gap located on the side facing the screen in the direction coinciding with the plane p positioning of the rays, and is equipped with a means of correcting astigmatism of rays, characterized in that, in order to improve image quality by reducing spherical aberration of the lens, the aperture of each electrode is located in the recess of the peripheral protrusion, and the correction means is made in the form of two strips parallel to the plane rays on opposite sides of the slit, and the ends of the strips are cut off from the side of the lateral rays so that the cut line at least from the side of the rays passes at the level of their axes.
[2]
2. Handset pop. 1, characterized in that the slice has a trapezoidal shape with straight or curved sides, with smaller bases of the trapezoid facing each other.
[3]
3. Handset pop. 1, characterized in that the slice has a rectangular shape.
[4]
4. Handset pop. 1, characterized in that the gap is made in the bracket mounted on the electrode closest to the screen, and from the side of the latter, and the width of the gap at the side beams is larger, Mem at the central
SU ", 1347873 AZ raising

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同族专利:

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公开号 | 公开日

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PL138314B1|1986-09-30|

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KR840000973A|1984-03-26|

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GB2101805A|1983-01-19|

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FR2509526B1|1986-08-29|

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BR8203963A|1983-06-28|

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IT8222268D0|1982-07-06|

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JPS5859535A|1983-04-08|

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NL8202797A|1983-02-01|

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GB2101805B|1985-08-21|

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PL237382A1|1983-01-31|

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JPH021344B2|1990-01-11|

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FR2509526A1|1983-01-14|

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DE3225634C2|1986-05-07|

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IT1151697B|1986-12-24|

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KR910001416B1|1991-03-05|

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CS238629B2|1985-12-16|

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DE3225634A1|1983-02-03|

引用文献:

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BE793992A|1972-01-14|1973-05-02|Rca Corp|CATHODIC RAY TUBE|

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US3873879A|1972-01-14|1975-03-25|Rca Corp|In-line electron gun|

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US4086513A|1975-03-03|1978-04-25|Rca Corporation|Plural gun cathode ray tube having parallel plates adjacent grid apertures|

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US4168452A|1976-06-10|1979-09-18|Zenith Radio Corporation|Tetrode section for a unitized, three-beam electron gun having an extended field main focus lens|

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US4317065A|1980-02-28|1982-02-23|Rca Corporation|Color picture tube having an improved electron gun with expanded lenses|

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US4370592B1|1980-10-29|1984-08-28|NL8302773A|1983-08-05|1985-03-01|Philips Nv|COLOR IMAGE TUBE.|

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US4583024A|1984-02-21|1986-04-15|Rca Corporation|Color picture tube having an inline electron gun with built-in stigmator|

---

US4595858A|1984-12-03|1986-06-17|Rca Corporation|Reinforcing means for a cup-shaped electron gun electrode|

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JPH0275133A|1988-09-09|1990-03-14|Hitachi Ltd|Electron gun assembly of color cathode-ray tube|

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CA2039501C|1990-04-16|1999-02-02|Loren Lee Maninger|Color picture tube having inline electron gun with focus adjustement means|

---

FR2724046B1|1994-08-26|1996-10-04|Thomson Tubes & Displays|COPLANAR ELECTRON CANON WITH IMPROVED FOCUSING ELECTRODES|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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US06/282,230|US4388553A|1981-07-10|1981-07-10|Color picture tube having an expanded focus lens type inline electron gun with an improved stigmator|

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US06/282,229|US4406970A|1981-07-10|1981-07-10|Color picture tube having an expanded focus lens type inline electron gun with an improved stigmator|

---