KR0137530B1 - Electron gun for color cathode ray tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color water tube electron gun used for large-sized televisions or high-definition industrial monitors. An object of the present invention is to install a four-pole electrode so that a four-pole lens can be formed by dividing the focusing electrode, and thus the deflection amount of the electron beam. By correcting the astigmatism according to the present invention is to provide a color water tube electron gun for preventing the degradation of the resolution, especially in the periphery of the screen.

In order to achieve the above object, an electron gun for a color fishery tube according to the present invention is provided with a pre-triode tube part composed of a cathode, a control electrode, and an acceleration electrode, and a main lens part composed of a focusing electrode and an anode, so that the focusing electrode is 4 A plurality of vertical protrusion barriers are attached to the left and right of each of the three electron beam through holes arranged inline so as to form a pole lens, and spaced apart from the first focusing electrode to which a variable focusing voltage V _df is applied. Horizontal protrusion bulkheads formed at opposite ends of the three electron beam through-holes on the opposite side of the common surface are attached to each other so that the second focusing electrodes to which the fixed focusing voltage V _sf is applied are not in contact with each other. It is a feature of the present invention to be characterized.

Description

Kalashnikov gun

1 is a cross-sectional view showing a schematic configuration of a general color water pipe.

2 is a cross-sectional view showing a schematic configuration of a conventional color gun electron gun.

3 is a diagram showing the distortion of the electron beam spot due to the nonuniform magnetic field of the self-focusing deflection yoke.

(A) is a distribution chart of a pincushion type horizontal deflection magnetic field.

(B) is a distribution diagram of a barrel-type vertical deflection magnetic field.

(C) is exploded explanatory drawing of the bipolar component and quadrupole component of (A).

(D) is exploded explanatory drawing of the bipolar component and quadrupole component of (B).

4 (A) is a view showing the shape of the distorted electron beam spot on the conventional color image tube screen,

(B) shows the distortion of the electron beam spot due to the effect of the quadrupole lens of the deflection magnetic field.

5 is an excerpt perspective view showing a conventional embodiment,

(A) and (D) are Examples of Zenith Corporation.

(B) is an example of Hitachi.

(C) is an example of Alciesa.

(E) is an example of Matsushita Corporation.

6 is a perspective view showing a main portion of the collar water tube electron gun according to the present invention partially cut away;

7 is an extract of the main part of FIG.

(A) is an exploded perspective view of the first focusing electrode.

(B) is an exploded perspective view of the second focusing electrode.

(C) is a longitudinal cross-sectional view which shows the combination of (A) and (B).

8 is an electric field distribution diagram between electrodes formed during a four-pole lens operation according to the application of the variable focusing voltage V _df .

Figure 9 is a schematic perspective view showing the design elements for the main part of the electron gun for the color receiver tube according to the present invention.

10 is a view showing a waveform according to the change of the variable focusing voltage V _df .

* Description of the symbols for the main parts of the drawings *

140: cathode 160: control electrode

180: acceleration electrode 200: focusing electrode

202: first focusing electrode 204: second focusing electrode

220: anode 300: vertical protrusion bulkhead

400: horizontal protrusion bulkhead V _sf : fixed focusing voltage

V _df : Variable focus voltage

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color water tube electron gun used for a large T.V or high-definition industrial monitor, and more particularly, to correct astigmatism according to the deflection amount of an electron beam, thereby preventing deterioration of the resolution of the sea surface in the periphery of the screen. It relates to a color award tube gun.

1 is a cross-sectional view showing a schematic configuration of a general color water tube.

According to FIG. 1, generally, the color receiving tube is composed of a CRT (1) and a deflection yoke (7), and the CRT (1) has red (R), green (G), and blue (B) phosphors on the front inner surface. A panel 3 to which a fluorescent surface 3a coated with a shadow mask and a shadow mask 4 having a color discrimination function are connected, and a funnel having a tubular neck portion 5a formed at a rear side thereof coupled to a side surface thereof. (5).

An electron gun 6 is embedded inside the neck portion 5a of the funnel 5, and a deflection yoke 7 for deflecting the electron beam 9 emitted from the electron gun 6 in a horizontal or vertical direction is coupled thereto. have.

2 is a cross-sectional view showing a schematic configuration of a conventional electron gun for color water tube.

According to FIG. 2, the conventional color water tube electron gun 6 is composed of a triode tube portion and a main lens portion, and the triode tube portion controls a cathode 11 arranged inline with a heater 10 therein and hot electrons emitted to the cathode. And a control electrode 12 and an acceleration electrode 13 for preliminary acceleration.

The main lens unit is composed of a focusing electrode 14 and an anode 15 for focusing and finally accelerating the pre-accelerated electron beam generated by the triode.

Here, the control electrode 12 is grounded, a high voltage of 500 to 700 V is applied to the acceleration electrode 13, 25 to 30 KV is applied to the anode 15, and an intermediate voltage of 20 to 30% of the anode is applied to the focusing electrode 14. Is applied.

In the conventional color image tube electron gun configured as described above, as a predetermined potential is applied to each electrode, the electrostatic lens is formed by the voltage difference between the focusing electrode 14 and the anode 15, so that the focused electron beam is landing on the fluorescent surface. Let's go.

At this time, the deflection yoke with the horizontal and vertical deflection coils acts to deflect the electron beam in the horizontal or vertical direction of the fluorescent surface.

In general, a color receiver using an inline electron gun employs a self-convergence type using a non-uniform magnetic field of a deflection yoke in order to concentrate three electron beams of blue, green, and red in one place of a fluorescent surface.

As shown in FIGS. 3A and 3B, the distribution of the magnetic field generated in the deflection yoke to which the self-focus type is applied is a pin cushion, and the vertical deflection field is a barrel. By preventing the misconvergence of the concentration on the fluorescent surface, the filament deflects the electron beam in the horizontal and vertical directions by Fleming's left-hand law.

However, as shown in FIGS. 3C and 3D, the magnetic field may be separated into a dipole component and a quadrupole component, which serve to deflect the electron beam in the horizontal and vertical directions. The quadrupole component focuses the electron beam in the vertical direction and diverges in the horizontal direction, distorting the electron beam spot by astigmatism.

Even if the magnetic field is close to uniform, the fine beams and barrel magnetic components cause the electron beam to undergo significant astigmatism at the periphery of the fluorescent surface, thereby distorting the beam spot.

4A and 4B further illustrate the distortion phenomenon of the electron beam spot.

According to FIGS. 4A and 4B, since the deflection magnetic field is not applied at the center of the screen, the electron beam spot has an accurate shape, but at its periphery, the beam diverges in the horizontal direction and overconcentrates in the vertical direction as described above. The high-density horizontally shaped core 17 and the hollow 18, which is a phenomenon of low-density up-and-down spreading up and down, are generated, thereby causing a problem of lowering the resolution of the screen periphery.

This problem becomes larger as the water pipe becomes larger or as the deflection angle becomes larger.

In order to solve the above problems, a number of methods for correcting astigmatism when the electron beam is deflected to the periphery of the screen have been adopted. As the correction means, the focusing electrode is divided into two to form the first focusing electrode and the second focusing electrode. Astigmatism is corrected by providing a four-pole lens with a four-pole electrode provided between them.

The correction means for astigmatism according to the prior art will be briefly described with reference to the accompanying drawings.

As disclosed in Zenith U.S. Patent No. 4,771,216 shown in FIG. 5 (A), a plurality of longitudinal rectangular electron beam through holes 22 are formed in the first focusing electrode 20 and face each other. One long horizontal rectangular electron beam through hole 32 is formed in the second focusing electrode 30 to form a quadrupole lens as the quadrilateral through holes 22 and 32 to correct astigmatism.

The means disclosed in U.S. Patent No. 4,772,827 to Hitachi, Inc., shown in FIG. 5B, is provided with a plurality of plate-shaped vertically projected partition walls 42 on both sides of the three electron beam through holes of the first focusing electrode 40. FIG. A pair of long horizontal protrusion barrier ribs 52 are attached to the upper and lower three electron beam passing holes of the second focusing electrode 50 to form a quadrupole range as the horizontal and vertical protrusion barrier ribs 42 and 52. Let's do it.

The means disclosed in U.S. Patent No. 4,887,009 of RSA Corporation, shown in FIG. 5C, is fixed in the three electron beam passing holes of the first and second focusing electrodes 60 and 70 that face each other. The two protruding sections 62a and 72a are formed by inserting and installing the cylindrical protrusions 62 and 72a extending from both ends at an angle so that the two sectors 62a and 72a are in contact with each other. As a result, a quadrupole electron lens is formed as the plurality of protruding holes 62 and 72.

The means disclosed in U.S. Patent Nos. 5,036,258 and 5,055,749 to Zenith, shown in FIG. 5 (D), pass through three electron beam through holes of the first focusing electrode 80 and the second connection electrode 90. It extends to the left and right to form a single horizontal hole 82 and 92, respectively, and a key-hole-shaped electron beam through hole at a predetermined interval between the first and second electrodes 90 and 90 ( A quadrupole lens is formed by inserting the quadrupole electrode 100 having a plurality of 102 formed therein.

The means disclosed in U.S. Patent No. 5,061,881 of Matsushita, Inc., shown in FIG. 5E, is an elongated quadrangular electron beam passing hole 112 for the first, second focusing electrodes 110 and 120, respectively. And a plurality of four-sided electron beam through holes 122 are formed to form a four-pole lens. Also, US Patent No. 5,281,896 of Samsung Electronics (not shown) also forms a four-pole lens with a through-hole having the same shape as above. Calibrate

The present invention has been made to solve the above-mentioned problems by means other than the above, and an object of the present invention is to install a quadrupole electrode so that a quadrupole lens can be formed by dividing the connecting electrode, thereby providing a deflection amount of the electron beam. By correcting the astigmatism according to the present invention is to provide an electron gun for a color image tube to prevent the degradation of the resolution, especially in the peripheral portion of the screen.

The color gun tube electron gun according to the present invention for realizing the above object comprises a triode tube portion consisting of a cathode, a control electrode and an acceleration electrode for generating, controlling and preaccelerating an electron beam, and collecting and preserving the electron beam pre-accelerated by the triode portion. The main lens unit consisting of a focusing electrode and an anode arranged to form an electrostatic lens for final acceleration and landing on a fluorescent surface is arranged so as to be sequentially arranged, and the connection electrode is formed of three electron beam through holes arranged inline to form a quadrupole lens. A plurality of vertical protrusion barriers are attached to the left and right sides of the first focusing electrode to which the variable focusing voltage is applied, and the bent parts facing each other at the upper and lower sides common to the three electron beam through-holes on the opposite surface spaced apart from the first focusing electrode. Long horizontal protrusion bulkheads formed in the wall are attached to the second focusing electrodes to which the fixed focusing voltage is applied. That is configured to consider it as claimed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 is a perspective view showing the main portion of the collar water tube electron gun according to the present invention partially cut away.

FIG. 7 is a diagram illustrating main parts of FIG. 6, (A) is a perspective view of a first focusing electrode (B) and a second focusing electrode, and (C) is a cross sectional view of (A) and (B). to be.

According to Figure 6, the electron gun according to the present invention is composed of a triode tube portion and the main lens portion is arranged in sequence, the heater is built in the triode tube part to adjust the radiation amount of the hot electrons generated in the negative electrode 140 and the cathode arranged inline The control electrode 160 to accelerate and the acceleration electrode 180 are comprised.

In addition, the main lens unit includes a focusing electrode 200 and an anode 220 for focusing and finally accelerating three electron beams of red (R), green (G), and blue (B) generated and generated in the triode part on the fluorescent surface. It is composed.

Here, the focusing electrode 200 is divided into two and divided into a first focusing electrode 202 and a second focusing electrode 204. The first focusing electrode 202 shown in FIG. 7A passes through three electron beams. A plurality of vertical projection barrier ribs 300 having a rectangular flat plate shape are attached to the left and right sides of the balls 202a, 202b, and 202c, respectively. The vertical width of the 304 and 306 is configured to be smaller than the vertical width of the vertical protrusion barrier ribs 302 and 308 provided on the outer surface of both electron beam passing holes 202a and 202b.

In addition, horizontal protrusion barrier ribs 402 having a rectangular flat plate shape in the horizontal direction are formed in the upper and lower portions common to the three electron beam through holes 204a, 204b, and 204c in the second focusing electrode 204 shown in FIG. 404 is attached, but bent portions 402a and 404a are formed so that both ends thereof face toward the center of both electron beam through holes 204a and 204c.

According to FIG. 7C, the vertical protrusion partition wall 300 attached to the first focusing electrode 202 and the horizontal protrusion partition wall 400 attached to the second focusing electrode 204 as described above are opposed to each other. Overlapped but not in contact with each other.

A predetermined potential is applied to each of the electrodes, in particular, the first variable focusing voltage V _df is applied to the first focusing electrode 202, and the second focusing electrode 204 is fixed to vary according to the amount of deflection of the electron beam. The focusing voltage V _sf is applied in synchronization with the deflection signal of the deflection yoke.

In general, as the CRT becomes larger or the deflection angle becomes larger, the variable focusing voltage V _df becomes higher than the fixed focusing voltage V _sf , and the variable focusing voltage is horizontal and vertical as shown in FIG. 8 in a TV or monitor circuit. It is supplied in a parabola waveform, and is generally applied at 300V or 1500V higher than the fixed focus voltage but lower than the anode voltage Ve.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In the electromagnet for color image tube according to the present invention, the electron beam generated and pre-accelerated in the triode according to a predetermined voltage is applied to each electrode is the first focusing electrode 202 and the second focusing electrode of the focusing electrode 200. Passed through 204, the final acceleration in the electrostatic lens formed by the potential difference with the anode 220 is finally focused on the fluorescent surface.

Here, since the deflection magnetic field of the deflection yoke is not applied when the electron beam is landed to the center portion of the fluorescent surface, astigmatism of the electron beam does not occur and a circular electron beam spot without hollow is obtained.

However, when the electron beam is landing to the periphery of the fluorescent surface, the variable focusing voltage V _df , which is changed in synchronization with the deflection signal of the deflection yoke, is applied to the vertical protrusion partition wall 300 of the first focusing electrode 202 and the second focusing. The horizontal protrusion barrier wall 300 and the vertical protrusion barrier wall 300 form a quadrupole electrode by a potential difference between the fixed focusing voltage V _sf applied to the horizontal protrusion barrier 400 of the electrode 204 to form a quadrupole lens. Let's go.

Thus, as shown in FIG. 8, the electron beam diverges vertically and is focused horizontally to change into an elongated form, passing through the main lens, and improving the hollow generated by the non-uniform magnetic field of the deflection yoke. By correcting the score difference, a good circular electron beam spot is formed in the entire fluorescent surface, thereby preventing degradation of resolution on the screen.

As shown in FIG. 9, a design element of an electrode piece forming a quadrupole lens as a correction means for astigmatism is shown.

Ts is the height of the vertically projected partition wall of the first focusing electrode.

Td is the height of the horizontal protrusion barrier of the second focusing electrode.

Hs is the vertical width of the vertical protrusion partition walls outside the electron beam passing holes on both sides of the first focusing electrode.

Hs' is the vertical width of the vertically projected partition wall left and right of the central electron beam passing hole of the first focusing electrode.

Hd is the horizontal width of the horizontal protrusion partition of the second focusing electrode.

Wc is the distance between the vertical protrusion partition walls left and right of the central electron beam passing hole of the first focusing electrode.

Ws is the distance between the vertical protrusion bulkheads on the left and right sides of the electron beam passing holes on both sides of the first focusing electrode.

Ld is the height of the bent portion of the horizontal protrusion partition wall of the second focusing electrode.

D is the diameter of the electron beam through hole.

S is the spacing between the centers of the electron beam passing holes.

S 'represents the spacing between the centers of Wc and Ws.

For the efficient operation of the quadrupole lens formed between the first focusing electrode and the second focusing electrode, the following conditions were obtained as a result of the three-dimensional analysis of the electric field by computer simulation and a calculator.

First, the relationship T _s ≤ T _d must be established.

The height Ts of the vertical protrusion barrier rib of the first focusing electrode serves to adjust the horizontal size of the electron beam, and when the height of the barrier rib is too small, the fixed focusing voltage V _sf decreases in the horizontal direction of the electron beam spot. Hollow occurs and the electron beam spot increases.

In addition, if the height of the partition wall is too large, the fixed focusing voltage increases in the horizontal direction, and the hollow phenomenon does not occur, but a high brightness blooming phenomenon occurs, and there is a difficulty in assembly processing.

Therefore, the height of the partition wall is preferably set to 2.0 mm or less.

Meanwhile, the height Td of the horizontal protrusion barrier rib of the second focusing electrode serves to adjust the vertical size of the electron beam, and the higher the height of the barrier rib, the lower the variable focusing voltage V _df can be applied. It is quite advantageous, and the electron beam spot can be formed in an elongate shape, so that the resolution of the periphery of the screen can be particularly improved.

On the other hand, when Ts is larger than Td, the withstand voltage characteristic becomes bad.

Second: HsHs' relationship must be established.

This is because the horizontal size of the electron beam is controlled as the height Ld of the horizontal protrusion bulkhead of the second focusing electrode becomes larger, so that Hs' is smaller than Hs without increasing LD so that the horizontal protrusion bulkhead of the second focusing electrode becomes the first. There is an effect of more closely facing between the vertical projection partition wall of the focusing electrode and to control the horizontal size of the electron beam.

In general, Hs' is preferably 4.0 to 4.6 mm and Hs is about 4.6 to 8.0 mm, which is an optimum position.

Third, a relationship of WcWsS must be established.

When the variable focusing electrode V _df is applied to the first focusing electrode, the lens formed between the acceleration electrode 180 and the first focusing electrode is changed to improve the resolution of the peripheral portion of the screen, but the three electron beams are concentrated in one place. In order to increase the convergence of the outer electron beam, Wc should be smaller than Ws, and Wc and Ws should be smaller than S.

For example, when S = 5.5 mm, Wc is 5.0-5.2 mm, and Ws is 5.2-5.6 mm, and it is preferable.

In addition, S 'should be configured to be larger or smaller than S according to the size of the variable focusing voltage to prevent the concentration of the outer electron beams from being shifted.

On the other hand, Wc and Ws also have a deep relation with the horizontal size of the electron beam. The smaller the Wc and Ws, the smaller the horizontal size is controlled like Ts. Therefore, Wc and Ws should be processed complementarily with Ts and Ld. It must be designed in consideration of characteristics.

Fourth: the relationship with Hd = 2S and WsD + 2Ld should be established.

Since the bent portion of the horizontally projected partition wall of the second focusing electrode should be configured to face toward the center of both electron beam through holes, Hd = 2S, and at least Ws is the diameter (D) of the electron beam through holes and the upper and lower two bent portions (2Ld). It is possible to increase the vertical focusing power of the electron beam passing holes on both sides, and to lower the variable focusing voltage (V _df ), thereby facilitating the circuit configuration for applying voltage to each electrode. do.

For example, if the diameter D is viewed at 4.0 mm, Ld is preferably 2.5 to 3.0 mm at an optimal height.

As described above, the color gun tube electron gun according to the present invention includes a quadrupole electrode designed to satisfy the above conditions and forms a quadrupole lens to correct astigmatism due to non-uniform magnetic field of the deflection yoke different from the deflection amount of the electron beam. The uniform electron beam cross section can be obtained over the entire fluorescent surface, and the effect of improving the resolution of the color receiving tube employing the same can be obtained.

Claims (8)

A triode tube portion consisting of a cathode, a control electrode, and an acceleration electrode for generating, controlling and pre-accelerating an electron beam; and a focusing electrode for forming an electrostatic range so that the electron beam pre-accelerated in the triode may be focused and finally accelerated to land on a fluorescent surface; but having to add the main consisting of a positive lens sequentially ordered, the focusing electrode so as to form a quadrupole lens is vertically projecting partition wall is installed, mounting a plurality of in-line arranged three electron beam passage hole, respectively of the left and right variable-focus voltage (V _df ) Is applied to the first focusing electrode and horizontal projection bulkheads formed at opposite ends of the three electron beam through holes common on the opposite surfaces spaced apart from the first focusing electrode. _sf ) is applied to the second focusing electrode is a non-contact and interlocking electron gun for the color, characterized in that the configured. 2. The color receiving tube according to claim 1, wherein the height Ts of the vertical protrusion barrier rib of the first focusing electrode is Ts ≦ Td with respect to the height Td of the horizontal protrusion barrier rib of the second focusing electrode. Electron gun. The electron gun for a color receiver tube according to claim 1, wherein the height Ts of the vertically projected partition wall of the first focusing electrode is 2.0 mm or less. 2. The vertical width Hs ′ of the vertical protrusion barrier ribs on the left and right of the central electron beam passage hole with respect to the vertical width Hs of the vertical protrusion barrier ribs outside the both outer electron beam passage holes. Colors tube electron gun, characterized in that the relationship is formed to be HsHs'. The vertical protrusion bulkhead of the first focusing electrode has a relationship between the distance Ws between the vertical protrusion bulkheads on the left and right sides of the outer electron beam through-holes with respect to the distance Wc of the vertical protrusion barriers on the left and right of the central electron beam through-hole. Color gun tube gun, characterized in that formed to be WcWs. The color (Ws) of the vertical bulge bulkheads on the left and right sides of the first and second electron beam passing holes of the first focusing electrode has a relationship of the distance (S) between the centers of the respective electron beam through holes (WsS). Award tube gun. The electron gun for a color receiver tube according to claim 1, wherein the bent portions of the horizontally projected partition walls of the second focusing electrode are bent to face each other toward the center of the both outer electron beam passing holes. According to claim 1, wherein the distance (Ws) between the vertical projection partition wall on both sides of the outer and outer electron beam through hole of the first focusing electrode is the diameter (D) of the electron beam passing hole and the height of the bent portion of the horizontal projection partition wall of the second focusing electrode ( A color award tube gun, characterized in that the relationship with Ld) is WsD + 2Ld.