JP3168862B2 - Method of manufacturing image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device of the type which uses a high voltage and irradiates an electron beam.

[0002]

2. Description of the Related Art A conventional image display device will be described with reference to FIGS. 4, 1 is a rear glass container, 6 is a rear electrode, 7a to 7d are linear cathodes as an electron beam source, 8 is an electron beam extraction electrode, 9 is a signal electrode, 10
Is a first focusing electrode, 11 is a second focusing electrode, 12a and 12b are horizontal deflection electrodes, 13a and 13b are vertical deflection electrodes, and these components are placed in the front glass container 14 and the rear glass container 1. It is stored and the inside of the container is evacuated. Line cathode 7
A to 7D are stretched in the horizontal direction so as to generate an electron current having a substantially uniform current density distribution in the horizontal direction, and a plurality of them are provided in the vertical direction at appropriate intervals (7a in this embodiment). , 7
(Only four of B, 7C and 7D are shown). These line cathodes 7a to 7d are formed by coating an oxide cathode material on the surface of, for example, a tungsten wire.
The back electrode 6 is made of a flat conductive material,
It is provided in parallel to d. Electron beam extraction electrode 8
Is made of a conductive plate which faces the back electrode 6 via the line cathodes 7a to 7d and has rows of through holes 15 provided at appropriate intervals in the horizontal direction in a horizontal line shape facing each line cathode.

The signal electrode 9 comprises a row of a plurality of vertically elongated conductive plates 17 arranged at predetermined positions at positions horizontally opposed to the through holes 15 in the electron beam extraction electrode 8, respectively. Each conductive plate 17 has a similar through hole 16 at a position facing the through hole 15 of the electron beam extraction electrode 8. The first focusing electrode 10 has a through hole 18 at a position facing the through hole 16 of the signal electrode 9.
And a conductive plate having The second focusing electrode 11 has a slit hole 19 vertically connected to a position facing the through hole 18 of the first focusing electrode 10.

The horizontal deflecting electrodes 12a and 12b are composed of two comb-shaped conductive plates 20 and 21 which are meshed with each other via an appropriate space and are connected to each other via a space. Space 2 created between electrodes 12a and 12b
2 is opposed to the through slit hole 19 of the second focusing electrode 11. The vertical deflection electrodes 13a and 13b are 23 and 24
As shown in the figure, a conductive plate connected at its ends, that is, two comb-shaped conductive plates are engaged with each other on the same plane with an appropriate interval therebetween.
, The lower conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. Screen 26
A phosphor 27 that emits light by irradiation with an electron beam is applied to the inner surface of the glass container 14, and a metal back layer (not shown) is added thereon.

The operation of the image display device configured as described above will be described. First, the voltage V is applied to the back electrode 6.
1. A voltage V2 higher than V1 is applied to the electron beam extraction electrode 8. Further, V1 <V0 in a state where the line cathode is heated and a heater current is applied to facilitate electron emission.
<Apply an appropriate voltage V0 of V2 to the line cathode 7a,
When the electric field on the surface of the linear cathode becomes positive, an electron flow is emitted and accelerated toward the electron beam extraction electrode 8. Further, when a voltage V0 satisfying, for example, V0> V2 is applied to the line cathode 7a, the electric field on the surface of the line cathode becomes negative, and emission of electrons can be suppressed. Therefore, by individually controlling the voltage of the line cathode, it repeats so as to emit an electron beam for a fixed time in the order of 7 b, 7 c,... A sheet-like electron beam having a uniform current density distribution in the horizontal direction can be generated.

The above-mentioned sheet-like electron beam is then divided into a plurality of pieces in the horizontal direction by the through-holes 15 of the electron beam extraction electrode 8, and reaches the through-holes 16 of the signal electrode 9 as a further array of electron beams. However, at this time, if the voltage V3 of the signal electrode 9 is set to V3> V0, the electron beam passes and V
If 3 <V0, the electron beam loses its kinetic energy and cannot pass. Therefore, by controlling V3 with time, the amount of passing of the electron beam is individually adjusted according to the video signal for displaying the picture element.

The electron beam that has passed through the signal electrode 9 reaches the first focusing electrode 10 and the second focusing electrode 11 and then passes through the through-hole 1.
8. After being converged and shaped by the electrostatic lens effect of the slit hole 19, between the conductive plates adjacent to the horizontal deflection electrodes 12a and 12b and between the conductive plates 23 adjacent to the vertical deflection electrodes 13a and 13b. , 24 are electrostatically deflected horizontally and vertically by a potential difference (referred to as a deflection voltage). Further, a high voltage (for example, 10 KV) is applied to the metal back layer of the screen 26, and the electron beam is accelerated to a high energy and collides with the metal back to cause the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix to form an aggregate of small sections 28, each small section 28
On the other hand, the entire screen can be projected on the screen by associating the electron beams divided as described above one by one, and deflecting and scanning the electron beam only in each small section. In addition, by controlling the RGB video signal corresponding to each picture element with time using the signal electrode voltage as described above, a television moving image can be reproduced. Further, in this image display device, as shown in FIG. 5, as shown in FIG. 5, the degree of vacuum is not reduced by gas or the like from the components contained in the space between the rear glass container 1 and the front glass container 14.
After the ring-shaped getter 30 is fixed to the electrode support plate 31, the core 32 is attached from outside the rear glass container 1.
A high frequency 34 composed of a copper pipe 33 for supplying electricity and passing cooling water is applied, and the getter is evaporated and scattered to the inner surface side of the rear glass container and the electron beam extraction electrode side to secure a vacuum degree. It is.

[0009]

In such an image display device, the getter 30 has a ring-shaped getter 30 attached to an electrode support plate 31 as shown in FIG. An eddy current was generated and the getter 30 was scattered by a self-heating action. However, in such a configuration, the high-frequency magnetic field 60 is not converged only to the getter, and the extraction electrode 8 and the like other than the getter are heated and deformed, and furthermore, the terminals of the signal electrode are heated and the thermal expansion with the glass containers 1 and 14 is caused. There is also a problem that a crack enters the glass container due to the difference and progresses and cracks.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems , the present invention comprises a front glass container and a rear glass container.
A flat screen with phosphor applied inside the space
And a back surface made of a conductive material facing the screen.
An electrode, disposed between the back electrode and the screen.
The cathode, the electron beam extraction electrode, the signal electrode,
A linear cathode with a bundle electrode, a deflection electrode and the screen
And an electrode support plate for supporting the electrodes, and the electrode support
And a ring-shaped getter attached to the plate
From the outside of the rear glass,
A high frequency magnetic field is applied to the ring-shaped getter to
Getters on the inner surface side of the glass and the electron beam extraction electrode side
High frequency magnetic field generating means for evaporating
Between the ring-shaped getter and the rear glass.
Shield plate is installed to prevent high frequency magnetic field from being applied outside
Thus, it is possible to heat only the ring-shaped getter .

[0011]

In order to solve the above-mentioned problems, the image display device of the present invention is provided with a shielding plate provided with an appropriate hole between a rear glass container and a high-frequency core, and heats only a ring getter. It is possible to do.

[0012]

According to the present invention, the magnetic field leaking to portions other than the getter portion can be cut by the shielding plate, high frequency can be applied only to the ring getter, and the electrode can be prevented from being deformed, and further, the container can be prevented from cracking. Thus, an image display device in which a degree of vacuum is ensured can be realized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a state where a high frequency is applied to the getter, and FIG. 2 is a sectional view thereof. Also,
FIG. 3 is an enlarged sectional view showing the getter structure.

As shown in FIGS. 1, 2 and 3, reference numeral 1 denotes a rear glass container. A conductive material is applied to the rear glass container 1 to form a back electrode 6. Further, a glass frit 35 is applied to the rear glass container 1, the fixed base 36 is positioned on the glass frit 35, and then fired, whereby the height accuracy of the fixed base 36 is secured to the rear glass container 1, It will be positioned and fixed. At this time, the back electrode 6 and the glass frit 35 are arranged at positions where they do not contact each other.

Next, the linear cathode plate 38 to which the linear cathode spring 37 is attached is fixed to the linear cathode base 39 by welding to form a pair as shown in the drawing. A getter 50 is attached to the electrode support plate 40.

As shown in an enlarged view in FIG. 3, the getter is formed by welding a ring-shaped getter (hereinafter referred to as a ring getter) and a semi-annular cover 49 in which a blade 48 is integrated with a getter mounting bracket 46. The getter 50 is constituted. The ring getter 47 has a U-shaped cross section, and is filled with a material such as barium, aluminum, or nickel. The integrated getter is fixed to the electrode support plate 40 by welding. A pair of left and right integrated linear cathode bases 39 and a pair of upper and lower electrode support plates 40 to which getters are attached are positioned and mounted on a fixed base, and assembled and fixed by laser welding or the like.

Thereafter, after the linear cathode 51 is stretched via the linear cathode spring 37 fixed to the linear cathode plate 38, the combined electrode from the electron beam extraction electrode to the deflection electrode is positioned and mounted. The rear glass container block is formed by placing and fixing. At this time, the linear cathode 5
1 for each one, a line cathode terminal 5 for applying a current.
2 is left and right out of the rear glass container 1 as shown in FIG. Also, one or two terminals for voltage application are arranged from the electron beam extraction electrode to the deflection electrode,
Like the above, it is taken out of the rear glass container 1. Further, among the above-mentioned electrodes, a plurality of signal electrodes are arranged at predetermined positions at positions facing the respective through holes in the electron beam extraction in the horizontal direction as described above. In order to apply a positive and a negative voltage, a plurality of (for example, 112) signal electrode terminals 53 for applying a plurality of (e.g., 112) signal electrodes 53 in the vertical direction of the rear glass container 1 are formed in the same manner as described above. It is out of the container 1.

Thereafter, said rear glass container block,
After sealing and fixing the front glass container coated with the phosphor, the inside of the container is evacuated and sealed. By applying high frequency to the getter from the outer surface of the rear glass container 1 of the sealed image display device and heating the getter to about 800 ° C., aluminum and nickel or the like undergo a self-heating reaction,
When the temperature reaches about 1100 to 1200 ° C., barium is evaporated and scattered.

The image display device of the present invention is provided with a shielding plate 55 provided with an appropriate hole 61 between the high-frequency core 54 and the rear glass container 1. At this time, the center of the high-frequency core 54 and the center of the shielding plate hole 61 are set to be the same.
By applying a high frequency wave to the getter 50 via the shielding plate 55, an extra magnetic field 62 is cut off, and only the getter 50 is heated. By providing the shielding plate 55 provided with the holes 61, the extra magnetic field 62 does not reach the extraction electrode, and therefore, it is not heated until the extraction electrode is deformed. Further, the signal electrode terminal 53 is not heated.

[0021]

As described above, according to the present invention, when the getter is scattered, the heat deformation of the extraction electrode is eliminated by providing the shielding plate provided with an appropriate hole between the high-frequency core and the rear glass container. Since the beam can reach a predetermined position, a beautiful image can be displayed.
Also, since the signal electrode terminals are not heated, cracks in the glass caused by thermal expansion between the terminals and the glass container can be eliminated, and the cracks do not proceed and the container does not crack.

Furthermore, since no extra heat is applied to structures such as electrodes, no gas is generated, the degree of vacuum which is the original purpose of the getter can be secured, and a highly reliable image display device is provided. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a high frequency is applied to a getter of an image display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the image display device.

FIG. 3 is an enlarged sectional view showing a getter structure of the image display device.

FIG. 4 is an exploded perspective view showing a basic configuration of the image display device.

FIG. 5 is a plan view showing a state in which a high frequency is applied to a conventional getter of the image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear glass container 6 Back electrode 14 Front glass container 26 Screen 30 Getter 31 Electrode support plate 32 High frequency core 33 Copper pipe 34 High frequency 35 Glass frit 36 Fixed base 40 Electrode support plate 46 Getter mounting bracket 47 Ring getter 48 Blade 49 Semicircular cover Reference Signs List 50 Getter 51 Wire cathode 53 Signal electrode terminal 54 High frequency core 55 Shield plate 60 Magnetic field 61 Hole 62 Extra magnetic field

Claims (1)

(57) [Claims] 1. A flat screen coated with a phosphor in a space formed by a front glass container and a rear glass container, a back electrode made of a conductive material facing the screen, and the back electrode and the screen. Arranged between
The line cathodes, an electron beam extraction electrode, a signal electrode, a focusing electrode, and deflection electrode, linear cathodes with said screen
And an electrode support plate for supporting the electrodes, and the electrode support
And a ring-shaped getter attached to the plate
From the outside of the rear glass,
A high frequency magnetic field is applied to the ring-shaped getter to
Getters on the inner surface side of the glass and the electron beam extraction electrode side
High frequency magnetic field generating means for evaporating
Between the ring-shaped getter and the rear glass.
Shield plate is installed to prevent high frequency magnetic field from being applied outside
And heating only the ring-shaped getter .