JPH0684481A - Electron gun assembly for color cathode ray tube - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an electron gun assembly for a color cathode ray tube in which a change in electrode spacing due to stress strain due to heat is reduced and deterioration of reproduced image quality is suppressed. [Structure] Embedding fixing portion 1 of at least one of control electrode 10 and accelerating electrode 20 in multi-form glass 45.
The tips of 8, 18 ', 19 and 19' are embedded by being inclined in the displacement direction due to thermal deformation in the tube axis direction. [Effect] It is possible to reduce the stress strain caused by thermal expansion in the electrodes forming the electron gun, suppress the fluctuation of the electrode interval when the electron gun is impacted from the outside of the color cathode ray tube, and increase the It is possible to reproduce a high quality image and prolong the life of the color cathode ray tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun assembly for a color cathode ray tube, and in particular, reduces the strain generated at the time of thermal expansion of the electrodes constituting the electron gun to reduce the fluctuation of the electrode interval due to an external impact. The present invention relates to an electron gun assembly for a color cathode ray tube having a structure.

[0002]

2. Description of the Related Art A color cathode ray tube is still in the mainstream as a monitor of television broadcast reception or an information processing machine because of its fine image reproducibility. FIG. 5 is a sectional view for explaining the structure of the color cathode ray tube, in which 50 is a face panel, 51 is a funnel, 52 is a neck connected to the funnel, 53 is an anode terminal, 54 is a shadow mask having many apertures, 55 Is an electron gun for emitting three electron beams, 56 is a deflecting device, and 57 is an electron beam. Further, 501 is a screen and 502 is a phosphor layer.

In FIG. 1, a vacuum container is formed by the face panel 50, the funnel 51 and the neck 52, and the electron gun 55 is housed in the neck 52.
A shadow mask 54 having a large number of apertures which are provided in the inner skirt portion so as to face the phosphor layer 502 at a predetermined interval.
Is suspended. In addition, a conductive film 511 that is evenly applied to a part of the neck 52 on the inner wall of the funnel.
And a conductive film applied to the inside of the funnel 51, a conductive film applied to the exterior, and an anode terminal 53 provided so as to penetrate a part of the funnel 51, and from the funnel 51 to the neck 52. Deflection device 56 on the outer wall of the
Is installed.

On the inner surface of the screen 501, red,
Green and blue phosphors are applied in stripes or dots, and three electron beams emitted from the electron gun are selected by the shadow mask 54 to impact each phosphor and cause it to emit light. FIG. 6 is a side view for explaining the structure of the electron gun, which is a cathode K that is a parallel electron beam generator of three in-line arrangements, the control electrode 10, and the acceleration electrode 2.
0, the focusing control 30, and the anode 40. The control electrode 10 and the acceleration electrode 20 are plate-shaped, and the focusing control 30 and the anode 4 are provided.
0 has a box shape (cup shape), and the embedding portion of each electrode is vertically embedded in a pair of multi-form glass 45 which is an insulator. In addition, H is a heater for heating the cathode K.

Among the electrodes forming the electron gun, the control electrode 10 and the accelerating electrode 20 formed of a plate-like body are the following electrodes for reducing the displacement amount in the tube axis direction during thermal expansion. It has a structure. That is, FIG. 7 shows a control electrode 10 for reducing the amount of displacement in the tube axis direction during the thermal expansion.
2A is a plan view and FIG. 3B is a partial side cross-sectional view of FIG.
Circular first step portions 14, 15, 16 protruding toward the cathode K side are provided in the peripheral portion of 13.

Further, these electron beam passage holes 11, 1
A second plate 17 and 17 'which is parallel to the acceleration electrodes 20 and protrudes in the vertical direction with respect to 2 and 13 and is connected to the embedded portions 18 and 18' in the multi-form glass 45. It has an electrode structure with a pressed part structure.
As a disclosure of this type of conventional technique, there is JP-A-59-215640.

[0007]

In the above-mentioned prior art, radiant heat from the cathode K causes thermal expansion in the order of control electrode 10 → accelerating electrode 20 → focusing electrode 30 → anode 40. In particular, the control electrode 10 and the acceleration electrode 20 near the cathode K are
Electrode temperature due to radiant heat is high and thermal expansion is large.

FIG. 8 is an explanatory diagram of electrode displacement due to thermal expansion of the control electrode and the accelerating electrode, which are plate electrodes, and the same reference numerals as those in FIG. 6 correspond to the same portions. In the figure, the displacement of the electrode due to thermal expansion is shown by a dotted line. As shown,
The thermal expansion of the peripheral portion a of the electron beam passage hole of the control electrode 10 that receives high radiant heat near the cathode K expands in the direction y of the multi-form glass 45, and the change amount of the electrode in the tube axis direction x is L ₁ toward the phosphor screen side. It is only displaced.

Further, the temperature of the peripheral portion a of the electron beam passage hole is conducted to the embedded portion of the multi-form glass 45 to cause thermal expansion of the electrode. At this time, from the embedded end portion d of the multi-form glass 45 to the second step 17,1
The amount of displacement up to the upper portion c of 7 '(FIG. 7) is combined with the effect of thermal expansion of the peripheral portion a of the electron beam passage hole, and L ₂ on the fluorescent screen side.
Only bent.

On the other hand, although the accelerating electrode 20 has less radiant heat than the control electrode 10, the peripheral portion e of the electron beam passage hole is displaced toward the cathode K side by the variation amount L ₃ , and the multiform glass 45 is embedded. End f and second step 17,1
Between 7 ', the amount of change L ₄ is bent toward the cathode K side. Thus, in the embedded portions of the control electrode 10 and the acceleration electrode 20 in the multi-form glass 45, the thermal expansion from the peripheral portions a and e of the electron beam passage hole and the multi-form glass 4 are formed.
By being embedded in and constrained in 5, stress strain occurs.

When the color cathode ray tube receives an impact from the outside during its operation, the stress strain is released by the impact being transmitted from the tube body to the electron gun, reducing the fixing effect of the electrodes and changing to the electrode interval. And the operating characteristics of the electron gun are deteriorated to deteriorate the quality of the reproduced image. An object of the present invention is to provide an electron gun assembly for a color cathode ray tube which solves the above-mentioned problems of the prior art and reduces a change in electrode spacing due to stress strain due to heat, and suppresses deterioration of reproduced image quality. It is in.

[0012]

In order to achieve the above object, the present invention is directed to three cathodes which emit a plurality of electron beams arranged in a horizontal row and at least one horizontal row facing the cathodes. A control electrode, an accelerating electrode, which has three electron beam passage holes, and has embedded fixing portions at both ends in the horizontal row direction,
In the electron gun assembly for a color cathode ray tube, wherein the embedded fixing portions are fixed and embedded in a multi-foam glass whose insulator is a focusing electrode and an anode in the tube axis direction, wherein the control electrode 10 and the accelerating electrode are provided. Embedded fixing portion 18 to at least one of the multi-form glass 45 of 20,
It is characterized in that the tip ends of 18 ', 19 and 19' are embedded while being inclined in the displacement direction due to thermal deformation in the tube axis direction.

[0013]

The embedded fixing portions 18, 18 ', 19, 19 in the multi-form glass 45 of at least one of the control electrode 10 and the accelerating electrode 20, which are plate-like electrodes that are thermally expanded by the radiant heat from the cathode K and displaced. 'Is inclined in the direction opposite to the displacement direction due to the thermal expansion of the electrode, so that the embedded fixing portions 18, 18' in the multi-form glass 45,
The stress strain that causes displacement at 19 and 19 'is relaxed.

That is, the control electrode 10 or the accelerating electrode 20 composed of a plate-shaped electrode is embedded in the multi-form glass 45 by the radiant heat from the cathode K through the beam passage hole having the highest temperature. It is displaced in the tube axis direction to the ends of 19, 19 '. At this time, since the tip end portions of the embedding fixing portions 18, 18 ′, 19, 19 ′ in the multi-form glass 45 are inclined in the displacement direction, the embedding fixing portions 18, 18 in the multi-form glass 45 are formed. ', 1
9, 19 'thermally expands in the opposite direction to the displacement direction, and the embedded fixing portions 18, 18', 1 of the multi-form glass 45 from the electron beam passage holes 11, 12, 13, 21, 22, 23.
The amount of displacement in the tube axis direction due to the thermal expansion of the ends of 9, 9'is reduced, and the stress strain of the embedded fixing portion of the multi-form glass is reduced.

As a result, it is possible to suppress the variation of the electrode interval when a shock is applied to the electron gun from the outside of the body of the color cathode ray tube.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main part configuration diagram for explaining a first embodiment of an electron gun assembly for a color cathode ray tube according to the present invention, which is an embodiment in which the present invention is applied to a control electrode. In the figure, H is a heater, K is a hot cathode (hereinafter, simply referred to as a cathode), 10 is a control electrode, 20 is an accelerating electrode, 30 is a focusing electrode, and 11 (1
2, 13) are electron beam passage holes of the control electrode, 18, 1
Reference numeral 8'denotes an embedding fixing portion of the control electrode, 19 and 19 'show embedding fixing portions of the acceleration electrode, and 21 (22, 23) denote electron beam passage holes of the acceleration electrode.

2 is a front view showing the structure of the control electrode in FIG. 1, and FIG. 2 (b) is a side view in which essential parts are broken. The same reference numerals as in FIG. 15,
16 is a first step, and 17 and 17 'are second steps.
The control electrode 10 is formed of a plate-shaped electrode as shown in FIG. 2, and is provided with three electron beam passage holes 11, 12, 13 in the in-line direction (horizontal line), and the respective electron beam passage holes 11, 12, Circular first step portions 14, 15, 16 protruding toward the cathode K side are formed in the peripheral portion of 13.

Further, the electron beam passage holes 11, 12,
13 and the first steps 14, 15 and 16 so as to be sandwiched in the vertical direction (direction perpendicular to the in-line direction).
Steps 17 and 17 'are formed, and as shown in FIG. 1, it has a single plate press part structure connected to the embedded fixing portions 18 and 18' in the multi-form glass 45. The embedded fixing portions 18 and 18 'are inclined toward the accelerating electrode 20 side so that the tips thereof fall toward the accelerating electrode 20.

In operation, the cathode K is heated by the heater H shown in FIG. 1 to bring the temperature of the cathode zenith surface to about 700 ° C. Therefore, the radiant heat from the cathode K causes the control electrode 10
The temperature of the peripheral portions of the electron beam passage holes 11, 12, 13 rises to about 200 ° C., and this temperature is dispersed to the embedded fixing portions 18, 18 ′ in the multi-form glass 45. Further, the heat radiation from the cathode K spreads to the acceleration electrode 20, the focusing electrode 30, and the anode (not shown) via the control electrode 10, and each electrode expands thermally.

In FIG. 1, the electrode displacement during thermal expansion during operation of the control electrode 10 is shown by a dotted line. Here, the tube axis direction is x, the multi-form glass direction is y, and the thermal deformation effect due to thermal expansion is caused by the electron beam passage holes 11, 12, and 13.
S1 (S1x, S1y) at the peripheral portion a of the second step 1
7, 17 'is S2x in the lower part, S3x in the upper part c and S4 (S
4x, S4y), the effect of thermal expansion in the tube axis direction x due to thermal expansion has a relationship of S1x−S2x + S3x−S4x when the fluorescent screen side is positive and the cathode side is negative, and the positive S1x, The balance between S3x and negative S2x and S4x makes it possible to reduce the stress strain of the embedded fixing portion of the multi-form glass, which is a problem in the conventional technique.

FIG. 3 is a main part configuration diagram for explaining a second embodiment of an electron gun assembly for a color cathode ray tube according to the present invention, which is an embodiment in which the present invention is applied to an accelerating electrode. In the figure, the same reference numerals as those in FIG.
Of the embedded fixing portions 19, 19 ′ due to the displacement of the peripheral portions of the electron beam passage holes 21, 22, 23 due to thermal expansion, that is, the embedded fixing portions 19, 19 ′ in the thermal displacement direction of the control electrode 20. 19 'is inclined.

As a result, the acceleration electrode 20 can be provided with an effect of suppressing stress strain by the same mechanism as in the first embodiment. FIG. 4 is a main part configuration diagram for explaining a third embodiment of an electron gun assembly for a color cathode ray tube according to the present invention, which is an embodiment in which the present invention is applied to a control electrode and an acceleration electrode. In the figure, the same reference numerals as those in FIGS. 1 and 3 correspond to the same portions, and both the control electrode 10 and the acceleration electrode 20 are embedded fixing portions 18, 18 ′ and 19, 1 in the thermal displacement direction.
9'is inclined.

As a result, the mechanism described in the first and second embodiments is the same as the control electrode 10 and the acceleration electrode 2.
It acts on 0 and suppresses stress strain of both electrodes. As described above, according to the above-described embodiments of the present invention, the control electrode 1
Multifoam glass 4 with 0 or accelerating electrode 20
5, the displacement amount in the tube axis direction of the electrode due to the thermal expansion of the ends of the embedded fixing portions 18, 18 ', 19, 19' is reduced, and the stress strain of the embedded fixing portion of the multi-form glass is reduced. The fluctuation of the electrode spacing when an impact is applied to the electron gun from outside the tube body of the color cathode ray tube is suppressed.

Although the present invention is applied to the control electrode 10 or the acceleration electrode 20 or the control electrode 10 and the acceleration electrode 20 in the above embodiment, the present invention is not limited to this, and an electron gun is constructed. The present invention can be applied to all the electrodes that generate heat or the electrodes that generate stress strain due to thermal displacement.

[0025]

As described above, according to the present invention,
It is possible to reduce the stress strain caused by thermal expansion in the electrodes forming the electron gun, suppress the fluctuation of the electrode interval when the electron gun is impacted from outside the color cathode ray tube, and obtain a high quality image. It is possible to provide an electron gun assembly for a color cathode ray tube capable of reproducing the above.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram illustrating a first embodiment of an electron gun assembly for a color cathode ray tube according to the present invention.

FIG. 2 (a) is a front view showing the configuration of a control electrode in the first embodiment of the electron gun assembly for a color cathode ray tube according to the present invention,
(B) It is the side view which fractured | ruptured the principal part.

FIG. 3 is a main part configuration diagram illustrating a second embodiment of an electron gun assembly for a color cathode ray tube according to the present invention.

FIG. 4 is a main part configuration diagram illustrating a third embodiment of an electron gun assembly for a color cathode ray tube according to the present invention.

FIG. 5 is a cross-sectional view illustrating the structure of a color cathode ray tube.

FIG. 6 is a side view illustrating a configuration of an electron gun of a color cathode ray tube.

FIG. 7 is a plan view (a) and a partial side sectional view (b) of a control electrode according to a conventional technique for reducing the displacement amount in the tube axis direction during thermal expansion.

FIG. 8 is an explanatory diagram of electrode displacement due to thermal expansion of a control electrode and a accelerating electrode, which are plate electrodes.

[Explanation of symbols]

 20 Accelerating Electrode 30 Focusing Electrode 11, 12, 13 Electron Beam Passing Hole for Control Electrode 18, 18 'Embedded Fixing Part for Control Electrode 19, 19' Embedded Fixing Part for Accelerator 21, 22, 23 Electron Beam for Accelerating Electrode Through hole 51 Funnel 52 Neck 53 Anode terminal 54 Shadow mask 55 Electron gun 56 Deflection device 57 Electron beam 501 Screen 502 Phosphor layer

Claims (1)

[Claims] Claims: 1. Three cathodes for emitting a plurality of electron beams arranged in a horizontal row, and at least three electron beam passage holes in a horizontal row facing the cathodes are provided, and both ends in the horizontal row direction. A collar formed by embedding the embedded fixing portion in a multi-form glass in which a control electrode, an acceleration electrode, a focusing electrode, and an anode having an embedded fixing portion are insulators, and fixing them at regular intervals in the tube axial direction. In the electron gun assembly for a cathode ray tube, the tip of the embedded fixing portion of at least one of the control electrode and the acceleration electrode in the multi-form glass is embedded with being inclined in the displacement direction due to thermal deformation in the tube axis direction. A characteristic electron gun assembly for color cathode ray tubes.