TWI281182B - Electron gun of cathode ray tube with successively narrowing beam grids - Google Patents

Abstract

The present invention provides an electron gun of cathode ray tube (CRT) with successively narrowing beam grids, wherein the electron gun consists of a cathode, a beam forming region, and an electrostatic lens region. The cathode is used for generating energy-carrying electrons. The beam forming region is installed between a display screen and the cathode and arranged on the same straight line as the cathode, and has a first grid set including multiple grids in radial arrangement. At least one first grid hole, arranged in straight line, is made on each grid to accept the energy-carrying electrons before transforming them into electron beams. The electrostatic lens region is installed between the beam forming region and the display screen, and has a second grid set including multiple grids in radial arrangement. At least one second grid hole, arranged in straight line, is made on each grid. The apertures of the second grid holes are successively narrowed along the direction from the display screen to the beam forming region to allow the electron beams to be focused on the display screen after passing through the second grid holes. Thus, the focus sensitivity of the electrostatic lens region on the electron beams can be increased and the video image quality on the display screen can be significantly improved.

Description

1281182 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Technical Field: The present invention relates to an electron rush of a cathode ray tube, and more particularly to an electron smash of a cathode ray tube which gradually reduces the size of an electron beam pole to effectively reduce electron beam The spherical aberration (spherlcal Aberratlon) phenomenon further improves the structure of the video image res〇iution. Prior art:

According to the electron robbing conventionally used in a monochrome or color cathode ray tube (CRT), its energetic electrons are emitted by a cathode and are directed toward the electron beam formed by the electron. (Beam Forming Region), the electron beam forming region consists of a -G1 control grid, a G2 screen grid, and a G3 focal grid.

The pole is formed by a portion of the G 2 screen electrode, etc., and the energetic electrons generated by the cathode in the cathode ray tube can be directly incident on and through the poles arranged in the line. a hole for forming an electron beam having a small and circular cross section in the electron formation region, and after the electron beam passes through the 3 pen forming region, 'will be directed toward an electron concentrating lens (丨〇cus lens) The electronic lens (f〇cus iens) can be divided into a pre-converging lens (pre-f0CUS iens) and a main converging lens (malI1 f〇cus lens) to cause the electron beams to be respectively concentrated to the display of the cathode ray tube A very small convergence point is formed on the phosphor layer of the screen, such that when the electron beams are scanned at a south speed onto the entire screen of the cathode ray tube, the video image to be played is generated on the display screen.

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Generally speaking, the size of the electron beam apertures on the gates is very small. 5. Description of the invention (2) Taking the G1 control grid and the G2 screen grid as an example, the diameter of the upper pole hole Generally, it is only about 公·3 mm to 〇·8 mm, and the electron beam pole hole of the G 3 focal grid on the G2 screen is larger. The straight line is generally about 1 gong. Between PCT and 2 mm, as for the remaining part of the G3 focal grid and the electron beam poles opened on the subsequent gates such as G4, the diameter is larger. Take the electron gun in the color cathode ray tube as an example. The diameter of the electron beam aperture formed on the subsequent gate is generally between about 4.5 mm and 7.5 mm. It can be seen from the above that in the electron gun of the color cathode ray tube, the electron beam pole hole which is located on the gate in the main focusing lens forming region (main f〇cus iens regi〇n) is based on the design electron to grab the common lens. (common lens) considerations, the closer to the display screen, the diameter, 3⁄4 in the electron capture of the monochromatic cathode ray tube, the electron beam pole on the gate in the main focus lens region The larger the hole diameter, the larger it may be. In addition, when the electron beam passes through the electron-forming region, the diameter of the electron beam is directed toward the display screen due to the radial velocity of the electrons with energy and the spatial electric field generated by the mutual impact between the electrons. Gradually, the size of the electron beam poles opened on each of the gates of an electronic grab has the same aperture. The reason for the same aperture is that a mandrel can be penetrated through it. When the gate is equal, the gates can be accurately positioned on the same line. Therefore, when the electron beam passes through the electron formation region, and its diameter is along

1281182 V. INSTRUCTIONS (3) ' '~~ When the display screen is gradually enlarged, the focusing effect generated by each gate in the electron formation region will vary depending on its position. The closer to the gate of the display screen, the larger the diameter of the electron beam will be, resulting in a stronger convergence effect on the electron beam. On the contrary, the closer to the gate of the display screen, due to the smaller diameter of the electron beam, only produces a weak convergence effect on the electron beam. This weak convergence effect will cause the deflection yoke (deflection y〇ke) The electron beam after deflection has an astigmatism (ast, lgmatlSm) at the size of its deflected beam spot, and the increase in electron beam beam's landing 〇r throw distance will also result in The o't-of-focus phenomenon, for these astigmatism phenomena and out-of-focus phenomena, is generally applied to the gates remote from the display screen, applying a large dynamic convergence voltage (dynamic f0cus v 〇Hage), to correct the current: to make a correction '$, that is, it is necessary to significantly change the design of the entire electronic robbing invention. In view of the above-mentioned traditional cathode ray tube electronic robbing, after partial bias, easy to The size of the focus point is = image, and it will be due to the electron beam falling point or projection distance, and it will be a shortcoming such as political opinion. * Mingren is researching and inventing - the type of electron gun that is gradually shrinking and causing out of focus phenomenon. By setting In the case where a large dynamic convergence voltage is applied to the sub-beam pole hole, there may be a son gun that can cause astigmatism and defocus on the display screen without the cathode ray tube. Elephant.

Page 7 1281182 V. INSTRUCTION DESCRIPTION (4) An object of the present invention is an electron beam forming region of a cathode ray tube of a size; the electron beam is shaped and aligned with the cathode And translating the energetic electrons into a plurality of intervals, the first one or more of which are arranged in a straight line of the first screen, wherein the electrons are arranged above the display beam, and the display beam is arranged to increase the good display. After the linear screen is arranged to pass through the upper line of the electronic through screen, in the electron, the increasing area and the second electron beam shape of the second group of the second electron beam are electrically connected to the image line. Gradually a sub-gun, thunderbolt; private a scorpion beam pole hole two: V ", sub-grab contains - cathode, - electric lnf. Regl0n) and - electron lens / 'where the cathode system is used to generate band energy t: is set in Between the display screen and the cathode, a linear position to receive electrons with energy, into an electron beam, the beamlet forming region includes a charging gate, and at least a first pole hole is disposed on each of the gates, and the energy is worn by the electrons Over the beam can be The electron beam forming region and the cross-sectional shape of the display screen are disposed between the non-screens, the electron lens region includes a plurality of gate electrodes, and at least one pole is disposed on the mother-gate, the second The size of the pole hole is gradually reduced along the direction of the forming area, and after the electric holes are aligned, the display screen can be focused on the display beam to improve the sensitivity of the beam focusing effect and improve the quality. Embodiment: Refer to FIG. Shown is a longitudinal cross-sectional view of a cathode ray tube electron gun of the present invention. The electron gun 1 is a quadrupole-type electron grab, and the electron grab includes a cathode κ to generate an electron of the summer. And let it shoot toward a G1 control pole (c〇ntr〇1 _____

1281182

_grid) 12 and a G2 screen grid 14 and through which the pole holes are arranged in a straight line. If the electronic robbing system can generate multiple sets of multi-beam electron guns, the electronic smashing unit will include two additional cathodes (for the sake of simplifying the drawing, the two The additional cathode-poles are not disclosed in Figure 1). The cathodes are arranged in a horizontal line to create three sets of energetic electrons that are directed toward and through the Gi's control grid. ) Corresponding pole holes on the 12 and G2 screen grids 14. In the present invention, the electron beam forming region (bfr) 36& includes the G1 control electrode 12, the G2 screen electrode 14 and a G3 gate electrode 16 facing a portion of the G2 screen electrode 14, which The electronic grab 10 further includes a dynamic focus lens 37 including another portion of the (second) gate 16 , a G4 gate 18 and a G5 gate 2 . A portion of the gate 18. For example, an electron gun 1 使用 which can be used in a color cathode ray tube to generate three electron beams can be used as an example. The figure shows only one set of electron beams, which are not in the U line, and is concentrated on one of the cathode ray tubes on the display screen 3 through the main focus lens (main f〇cus 1 ens ) 3 8 provided thereon. The main lens $ lens 38 includes another portion of the G5 gate 2 and a (3) gate 22. General Lu: The G1 control pole 12 is kept at zero potential, and the G2 screen "and the gate 18 are respectively connected to the same voltage ^ voltage source", and the voltage is maintained in the range of 4 0 0 to 75 0 volts. The (2) gate 16 and the G5 gate 20 are respectively connected to a voltage source 28 of the same focus voltage VF, and the G6 gate 22 is connected to an accelerating voltage, or an anode (for the sake of simplicity of the drawing, The anode is not visible

1281182

5. Description of the invention (6) shown in Figure 1). Referring to FIG. 1, the charged electrons generated by the three cathodes K of the electronic cathode ray tube of the color cathode ray tube form three sets of electron beams 34 after passing through the electron beam forming region 36. The electron beam 34 will be worn in sequence by the action of the beam's space-charge effect and the radial velocity of the electrons (the direction of which is perpendicular to the longitudinal axis 2 of the electron grab 10). After the dynamic focus lens 37 and the main focus lens 38 are struck and hit the display screen 30, they will gradually expand along the radial direction thereof. This phenomenon causes the cross-sectional area of the electron beam 3 4 to follow its projection direction. ,gradually increase. In the present invention, in order to increase the focus of the electron beam 10 on the focusing effect of the electron beam 34, the aperture of each of the pole holes through which the dynamic focusing lens 37 passes the electron beam may be directed toward the cathode K. slowing shrieking. Thus, when the aperture 丨6 a of the other portion of the G 3 gate 16 is dl, the aperture of the pole hole 18a of the G4 gate 18 will be d2, and the gate G20 of the G5 faces the G 4 The aperture of the pole hole 2 〇a of a portion of the gate 18 will be d 3 , and d 3 > d 2 > d 1, to match the phenomenon that the electron beam gradually decreases in diameter toward the cathode κ to increase The electron captures the focus sensitivity of the electron beam 34, and corrects the astigmatism of the electron beam to maintain the minimum spherical aberrat y in the fabrication of the present invention. When the electronic grabs 1 0, as shown in Fig. 1, it uses a mandrel 3 2 (shown as a broken line in Fig. 1) to penetrate the g 1, G 2, G 3, G 4, G 5 and G 6 etc. The pole holes arranged on the same line on the grid, the mandrel 32 is a shaft body which is stepped and tapered, and the diameter of the shaft body at each stage is just

Page 10 1281182 V. INSTRUCTIONS (7) The thumb can be placed on the 兮 轴 axis 32 〇肷 俾 俾 俾 俾 俾 俾 俾 俾 俾 俾 俾 俾 俾 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极 栅极The mandrel 3 2 is then withdrawn to form the electronic grab of the present invention. 2 is a schematic diagram of a longitudinal section of a cathode electron beam 40 in a preferred embodiment of the present invention. The electron gun 40 is a bi-P〇tential electronic grab. 4〇 includes a cathode κ to generate ▼ energy electrons, which are directed to the -G1 control electrode (c〇ntr〇1 grid) 42 and the one-G2 screen grid 44' and are arranged in a straight line therethrough. The electron beam formed by the polar hole and the crucible (for the sake of simplicity, only one set of electron beams is shown in Fig. 2, as indicated by the broken line), and will sequentially pass through a G 3 丄 gate 46 and a G32 gate. The pole 48, the G33 gate 50 and the G4 gate 52 are arranged in a straight line corresponding to the pole holes. If the electronic robbing system can generate multiple sets of electron beam electronic robbing, the electronic smashing will include two additional cathodes (for the sake of simplicity, the two additional cathodes are not disclosed) In Fig. 2, the cathodes are arranged in a horizontal line to generate three sets of energetic electrons, and the electrons are respectively directed toward and through the corresponding pole holes provided on the respective gates. In the preferred embodiment, the electron beam forming region (β FR ) 6 4 of the electron gun includes the G 1 control electrode 4 2, the G 2 screen 4 4 and the G 3 1 gate 46 facing the G2. In one portion of the screen 44, the electron gun 40 further includes a dynamic focus lens 66 and a main focus lens 68, wherein the dynamic focus lens 66 includes another G31 gate 46. A portion of a G32 gate 48 and a G33 gate 50 face a portion of the G32 gate 48. The main focusing lens 68 includes another portion of the G33 gate 50 and a G4 gate 52. Wherein the G4 gate 52 is connected to a focus voltage Eb

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a voltage source 62, which provides a voltage for focusing the electron beam, and the G31 gate 46 and the G33 gate 50 are respectively connected to a voltage source 58 of the same dynamic voltage Vd. The G32 gate 48 is connected to a voltage source 60 of a fixed voltage Vs, when supplied to the fixed voltage V s of the gate G 4 2, and supplied to the gate 3 of the G 3 1 The combination of the dynamic voltage Vd of the gates 50 of G33 (changed over time) produces first and second dynamic quadrups 54 and 56 (see the dashed lines in Fig. 2). The first and second dynamic quadrupoles 54 and 56 will respectively form a time varying (t ime var i ab 1 e ) lens for compensating for the astigmatism effect caused by the sweeping vehicle (astigmatism effect) The first dynamic quadrupole 54 is formed on another portion of the G32 gate 48 and a portion of the G33 gate 50 facing the G32 gate 48. The second dynamic quadrupole 56 is formed on the G31. The other portion of the gate 46 and the G 3 2 gate 4 8 face a portion of the G 3 1 gate 46. Referring to FIG. 2, since the electrons generated by the cathode K of the electron ray tube of the color cathode ray tube pass through the electron beam forming region 64, an electron beam 6 5 is formed, and the electron beam 6 5 is formed. The electron beam 6 5 sequentially passes through the dynamic focus lens 66 and the main focus lens 68 to impinge on the display screen, during which the electron beam 65 will gradually expand in the radial direction thereof. Therefore, in the present invention, in order to increase the focus sensitivity of the electron-collecting 40 pairs of electron beams 65, the dynamic focus lens 66 can be caused to pass the aperture of each of the pole holes through which the electron beam passes, toward the cathode K. The direction is gradually reduced, that is, when the aperture of the other portion of the G31 gate 46 is dl, the aperture of the hole 32a of the G32 gate 48 facing a portion of the G31 gate 46 will be for

Page 12 1281182 V. Description of the Invention (9) d 2, the aperture of the other portion of the G 3 2 gate 48 8 8 8 b will be d 3 , the G 3 3 gate 50 facing the The aperture of the pole hole 50 a of the G 3 2 gate 4 8 will be d4, and the diameter of the pole hole provided on each gate of the dynamic focus lens 66 is referred to the figures 2a to 2d. In the order of d4 >d3>d2>dl, the electron beam astigmatism phenomenon (as tigmat ism) is corrected to match the phenomenon that the electron beam 6 5 gradually decreases in diameter toward the cathode K. Minimum spherical aberration. Referring to FIG. 3, it is a longitudinal cross-sectional view of a cathode ray tube electronic robbing in another preferred embodiment of the present invention. The electron gun 7 is also a bipotential electron robbing device, and the electron robbing 70 includes a cathode. K, to generate an electron with energy' and direct it to a G1 control pole (contr〇i grid) 72 and a G2 screen (scree π grid) 7 4 ' and a pole hole arranged in a straight line corresponding thereto An electron beam 6 5 is formed (for simplicity, only one set of electron beams is shown in FIG. 3, as indicated by a broken line therein), and the electron beam 65 is sequentially passed through a 631 gate 76 and a G32 gate. 78. A G33 gate 80, a G34 gate 82, and a G4 gate 84 are aligned with the poles of the line. If the electronic robbing system can generate multiple sets of electron beam electronic robbing, then the electronic rushing 7 〇 will include the other two 匕 之 之 @ ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Unexposed = 3 figure + middle) 'The cathodes are arranged in a horizontal line to produce three sets of corresponding pole holes. The finder-child knives are directed and penetrated through each of the gates (BFR) in SI 々 2:1. 'The electron rushing electron beam forming area ^^G3H, #76 1 1 knife ° Hai electronic grab 70 is still included Dynamic aggregation

Page 13 1281182 V. INSTRUCTION DESCRIPTION (10) A dynamic focus lens 77 and a main focus lens 79, wherein the dynamic focus lens 77 includes another portion of the G31 gate 76, The 栅极32 gate 78, the 633 gate 80 and the 034 gate 82 face a portion of the G33 gate 80. The main focus lens 79 includes another portion of the G34 gate 82 and the G4 gate. a pole 84, wherein the G32 gate 78 and the G 3 4 thumb pole 8 2 are respectively connected to a voltage source 90 of the same one of the dynamic voltages (V ynam丄cv〇ltage) Vd, which is displayed along with the electron beam scanning The time of the screen changes, the G31 gate 76 and the gate 33 of the 〇33 are connected to a voltage source 92 of a fixed voltage Vs, which is connected to an anode voltage ( An 〇de v〇ltage) Eb voltage source 94 to provide the voltage required to focus and accelerate the electron beam to the display screen. When the dynamic voltage Vd supplied to the G82 gate 78 and the G34 gate 82 is combined with the fixed voltage Vs supplied to the G31 gate 76 and the G33 gate 80, 'will be in its dynamic focus lens First, second, and third dynamic quadrups 86, 87, and 88 are generated in (dynamic f〇cus lens) 77 (refer to the dotted line in FIG. 3), wherein the first dynamic quadrupole 8 6 Formed on another portion of the G 3 3 gate 80 and a portion of the G 3 4 gate 82 facing the G3 3 gate 80, the second dynamic quadrupole 87 being formed on the G 3 2 gate The other portion of the pole 7 8 and the G 3 3 gate 80 face a portion of the G32 gate 78. The third dynamic quadrupole 88 is formed in another portion of the G31 gate 76 and the G32. The gate 78 faces the port P of the G31 gate 76 and is damaged. 5 希弟一,弟二一和弟二 dynamic quadrupoles 86, 87 and 88 can be changed with time by the dynamic focus lens 7 7 'mainly used to compensate for the astigmatism caused by the sweep influences

Page 14 1281182

• (astigmatism effect) o

As shown in Fig. 3, the energetic electrons generated by the cathode K of the electron-collecting tube of the color cathode ray tube will rise to the Hongzi beam 6 5 after passing through the electron beam forming region, and the electrons After passing through the dynamic poly-focus lens 77 and the main focus lens 79 in sequence, the beam 6 5 will strike the display screen, as the electron beams 65 will gradually expand in the radial direction during this process. The present invention is to increase the sensitivity of the electron ray 70 to the focus of the electron beam 65 (f〇cuXs sensitivity), so that the dynamic focus lens 77 can block the aperture of each of the 5 hp holes of the electron beam toward the cathode κ direction. Gradually decreasing, that is, when the aperture of the other portion of the gate hole 76 of the gate 63 of the Q 3 1 is dl, the gate of the gate of the G3 2 faces the portion of the gate of the gate G 7 The hole 7 8 a will have a diameter d 2 , and the other hole of the G 3 2 gate 78 will have a hole diameter of d3, and the G33 gate 80 faces a portion of the G 3 2 gate 7 8 . The upper aperture 8 〇a aperture will be d 4 , and the other part of the G 3 3 gate 80 has a hole diameter 8 〇b aperture d 5 , and the dynamic focus lens 77 is provided on each gate The diameter of the pole hole is as shown in Figs. 3a to 3f, and is sequentially d6>d5>d4>d3>d2>dl to match the phenomenon in which the electron beam 65 gradually decreases in diameter toward the cathode K, and the image is corrected. Dispersion phenomenon (astigmatism) °

The above is only the preferred embodiment of the present invention, but the scope of the claims of the present invention is not limited thereto, and those skilled in the art can easily think according to the technical contents disclosed in the present invention. And equivalent changes shall be made without departing from the scope of protection of the present invention.

Page 15 1281182 Brief Description of the Drawings • Brief Description of the Drawings: Fig. 1 is a schematic longitudinal sectional view of an electron ray grabbing of a cathode ray tube which gradually reduces the size of an electron beam pole; Fig. 2 is a comparison of the present invention In the preferred embodiment, the longitudinal section of the electron grab is shown as follows; the 2a~2d diagrams are in the preferred embodiment of the invention shown in Fig. 2, along 2&-23, 213-21), 2(:- respectively. 2(: and 24-2 (1 hatching, a schematic cross-sectional view of the electron gun presented; FIG. 3 is a schematic view of the longitudinal section of the electron grab in another preferred embodiment of the present invention, 3a~3f Figure 3 is a cross-sectional view taken along line 3a-3a, 3b-3b, 3c-3c, 3d-3d, 3e-3e and 3f-3f in the preferred embodiment of the invention shown in Figure 3, respectively. Schematic diagram of the cross section of the electron gun. Representative symbols of the main part: Electronic grab............... 1 0, 4 0, 7 0 G1 Control pole........ .......· 1 2, 4 2, 7 2 G2 screen ...............14, 44, 74 G 3 tearing pole...... ........16 G31 Gate...............46,76 G32 Torn...............48, 78 G33才册极..................50, 80 G 3 4 trees ............... 82

Page 16 1281182 Schematic description of the 'G4 thumb thumb................18 λ 84 λ 5 2 G 5 thumb......... ....2 Ο G 6 thumb pole ................ 2 2 electron beam forming zone ................36, 64,75

_ Cathode..................K Dynamic Focusing Lens................3 7,6 6,7 7. Main Focusing Lens. ..............38^68^ 79 Display screen..................30 Electron beam ........... ....· 34, 65 Voltage source...............26,2 8,6 2,5 8,6 0,9 0,9 2,9 4 Polar hole. ..............16a, 18a, 20a, 46a, 48a, 48b, 50a, 76a, 78a, 78b, 80a, 80b by car.......... .....3 2 The first dynamic quadrupole...............5 4,8 6 The second dynamic quadrupole............... 5 6, 8 7 Third dynamic quadrupole...,............8 8

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Claims (1)

1281182 VI. Application for Special-quot; -- 1 N ία An electron of a cathode ray tube that gradually reduces the size of an electron beam pole hole. The electron robbing includes: ^ pole' is used to generate electrons with energy; a beam forming region, the electron beam forming region is disposed between the cathode ray and the wire of the cathode, and is arranged in the same line and position as the cathode to receive electrons with energy, and the energy is generated The electron beam forming region includes a plurality of spaced-apart first group of filling gates, and each gate has at least one or more linear poles arranged in a line. After passing through the first pole holes, the electron beam can be in the / pen beam forming region and the path of the display screen, the shape of the face; "Beer 21 electronic lens region, the electron lens region is set in the electron Between the beam forming region and the display screen, the electron lens region includes a plurality of second spaced arrays, charging gates, and each gate has at least one first pole hole arranged in a line, the second The size of the pole hole is gradually reduced along the display screen to the direction of the electric beam forming region, and the electron beams are focused on the display screen after passing through the second pole hole. 2. In the case of the electronic robbing described in the scope of the patent application, the Emperor grabs the second cathode, which is arranged in a horizontal line to produce three sets of energetic electrons, and to make the electrons separate. The light is directed toward and through the corresponding pole hole provided on the μ ^ electric gate. ~寺充3, as claimed in the scope of claim 1 of the electronic grab, wherein the two bundle forming area comprises a G1 control pole, a G 2 screen pole and a g 3 grid top:, one of the G 2 screen poles Part. . Hai Page 18 1281182 6. Patent Application No. 4, as claimed in claim 3, wherein the electronic lens region includes another portion of the G3 gate and a plurality of gates and 5s between the G3 gates and 5 The display screens are arranged in a straight line between the screens. 5. The electron gun of claim 2, wherein the electronic lens comprises at least one dynamic quadrupole lens to correct astigmatism of the electron beam on the display screen. The electronic smash of claim 5, wherein each of the dynamic quadrupole lenses comprises at least two or more grams of electrical gates. For example, in the scope of the patent scope, the electron gun of the second item, the electronic lens area includes at least one dynamic dipole lens to correct the astigmatism of the electron beam on the screen. The electron gun of claim 7, wherein each of the dynamic lens comprises at least two or more gram caps.