KR19990003824U - Electrode fixing structure of color cathode ray tube - Google Patents

Abstract

The present invention relates to an electron gun for a color cathode ray tube, and in particular, a protrusion protruding from a depression of an electrode recessed in an insulating support as a means for minimizing the change between the cathode, the control electrode, and the accelerating electrode due to heat transfer due to the heating of the heater. It is formed.

In this way, the adhesion between the insulating support and the electrode is improved so that there is no change in a specific direction or the amount of change is small, thereby improving the quality and reliability of the cathode ray tube.

Description

Electrode fixing structure of color cathode ray tube.

The present invention relates to an electron gun for a color cathode ray tube, and in particular, provides a means for minimizing the change of the distance between the cathode, the control electrode, and the accelerating electrode to heat transfer due to the heating of the heater, thereby reducing the stress of the insulating support for fixing the electrode. Its purpose is to realize high quality cathode ray tube with high absorption.

A general cathode ray tube configuration includes a panel 1 mounted on the front surface of the CRT and a fluorescent surface coated with phosphors of red (R), green (G), and blue (B) on the inner surface of the panel (1). (2) and the shadow mask (4) having a color screening function through the electron beam (3) incident on the fluorescent surface (2) and the back of the panel (1) to keep the inside of the cathode ray tube in a vacuum state Side panel 5, a deflection yoke 6 for deflecting the electron beam 3 surrounding the outer side of the side panel 5, and a tubular neck portion retracted to the rear of the side panel 5 ( 7) appearance is composed.

The electron gun mounted in the neck portion 7 is provided with a cathode 10 having a heater 9 therein, which receives power from the stem pin 8 and generates heat, and in front of the cathode 10, electrons are formed. The control electrode 11 for controlling and the acceleration electrode 12 for accelerating are positioned, and the first, second, third, and four acceleration / concentration electrodes 13, 14, 15, and 16 forming the pre-focus lens and the main lens Are arranged sequentially.

In addition, a shield cup 18 in which a bulb space contact 17 for welding an electron gun is welded to the neck portion 7 of the cathode ray tube is disposed in front of the fourth acceleration / focusing electrode 16.

Fig. 2 is a bead mount structure serving as a basic skeleton of an electron gun embedded in a color cathode ray tube.

Here, the cathode support 19 is a plurality of electrodes are fused and fixed by a plurality of insulating supports 20 at regular intervals, in order to configure the cathode support to heat the electrodes arranged at regular intervals by a predetermined temperature in advance to insulate the insulator After it is made in a semi-melt state it is fixed by fusion to the recessed portion (F) of the outer portion of each electrode.

Here, after the electrodes are fused and fixed to the insulating support 20, the completed electron gun is sealed in a cathode ray tube, and then subjected to an exhaust process of extracting air in the cathode ray tube to vacuum the cathode ray tube.

3 illustrates the shape of the depression F, which is an outer portion of each of the electrodes fixed to the plurality of insulating supports 20.

Here, the recessed portion F, which is an outer portion of each electrode, is fused to the insulating support 20, thereby maintaining the fusion-fixed state by the bead support portion X of the recessed portion F.

Not described 21 is a through hole formed in the electrode, 22 is an electron beam through hole.

Referring to the operation of the general cathode ray tube configured as described above, first, the electron gun generates a heat when the heater 9 receives the power (6.3V) from the stem pin 8 and the temperature of the cathode 10 is about 800 ° C. By the hot electrons are emitted from the cathode 10 and the emitted electrons are controlled and accelerated while passing through the control electrode 11 and the acceleration electrode 12, the first, second, third acceleration / connection electrodes 13, 14, The prefocus lens formed by 15 is reduced in the divergence angle of the electron beam 3 and focused and accelerated by the main lens formed by the third and fourth acceleration / concentration electrodes 15 and 16 and installed in front of the fluorescent surface 2. It passes through the shadow mask 4 and collides with the fluorescent screen 2 to emit light.

In FIG. 2, the getter pressing completed cathode tube undergoes an aging process to emit electrons from the electron gun. DC8V is applied to the ac qv control electrode 11 and DC260V to the acceleration electrode 12 to the heater 9. This is done by dividing into current activation to stabilize.

Through this process, the decomposition of the carbonate attached to the upper portion of the cathode 10 is completed, and the active electron emission is possible.

At this time, heat is generated from the cathode 10 and each of the electrodes receives heat and expands. The control electrode 11 and the acceleration electrode 12 of the electrodes are formed in a single plate shape, so that the influence of heat is greater. In particular, the stress of the plate-shaped electrode remaining in the electrode, which is generated during fusion with the insulating support 20, helps the expansion rate due to heat, and has a greater adverse effect on the screen characteristics of the cathode ray tube.

Therefore, as shown in FIG. 3, the first configuration includes a simple cutout without the through-hole 21, and the expansion caused by the heat generated during the operation of the cathode ray tube is transmitted to the control electrode 11 and the acceleration electrode 12 as it is, and the insulating support 20 ) Has a problem in that the sliding phenomenon occurs in the direction of the electron beam through hole 22 of the control electrode 11 and the acceleration electrode 12, resulting in a bad effect on the electron beam focusing characteristics of the cathode ray tube.

As a result of this phenomenon, among the electrodes of the conventional electron gun, in particular, the control electrode 11 and the acceleration electrode 12 have the stress generated when the insulating support 20 is bonded to each other, which is caused by the heat conducted from the heater 9. The expansion degree of the control electrode 11 and the acceleration electrode 12 which expand in the opposite direction to the cathode is further intensified.

Therefore, the cathode current drops as shown in FIG.

Combining this change in current is shown as (b) of FIG. 4, which is called an over shoot characteristic curve, and an overshoot characteristic amount (B / A × 100) of a general electron gun is usually about 90 to 140%. As the high-density electron gun develops, the through-holes 21 of the control electrode 11 and the acceleration electrode 12 become smaller, and the influence of thermal expansion by the heater 9 becomes more sensitive.

In view of this, stresses are formed between the insulating support 20, the control electrode, and the accelerating electrode by providing the through-hole 21 at the fusion boundary between the control electrode 11 and the acceleration electrode 12 with the insulating support 20. In order to reduce the pressure and prevent expansion due to residual stress, no change occurs in the overshoot characteristic curve of the cathode current value and (b) as shown in FIG.

Accordingly, the fusion boundary portion through-hole 21 has a stress removing effect, but the fusion force and the fixing stability is determined to be unstable as in the prior art.

The present invention has been made in view of the problems described above, in order to increase the welding force between the depression of each electrode and the insulating support, the area of each electrode depression is maximized, and protrusions protruding on the depression of each electrode are formed on the insulation support. To engulf it.

1 is a configuration diagram of a cathode ray tube.

Figure 2 is a cross-sectional view taken an electron gun portion.

Figure 3 is a state showing a fixed state by extracting the control electrode and the insulating support.

Figure 4 is a conventional design, (a) shows a change state of the cathode current, (b) shows a state in which the change of the current is synthesized.

Figure 5 is a state diagram showing a fixed state by extracting the control electrode and the insulating support with the present invention.

Figure 6 is an exemplary view showing a variety of examples of protrusions formed in the depression of the control electrode and the acceleration electrode according to the present invention.

Figure 7 is the present invention, (a) shows a change state of the cathode current, (b) shows a state in which the change of the current is synthesized.

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

101: control electrode 102: insulating support

103: projection 104: electron beam passing through

The electrode fixing structure of the color cathode ray tube of the present invention will be described below with reference to the accompanying drawings.

Since the configuration of a general cathode ray tube is the same as in the prior art, the present invention will be described in detail by extracting each electrode, in particular, a control electrode and an insulating support.

5 to 7, an electron gun including each electrode including a control electrode 101 for controlling hot electrons generated from a cathode part emitting hot electrons, and an insulating support 102 recessing and fixing both ends of the electrodes. In the present invention, one or more raised protrusions 103 are formed in a recessed portion in which each electrode including the control electrode 101 is recessed in the insulating support 102.

Reference numeral 104 denotes an electron passing hole.

The present invention can improve the reliability of the cathode ray tube by improving the welding force of the control electrode 101, the acceleration electrode (not shown) and each electrode fixed to the insulating support 102.

In other words, during operation of the cathode ray tube, the conductive heat conducted from the cathode causes the control electrode 101 or the control electrode 101 to expand in the opposite direction to the cathode, and receives the heat from the control electrode 101 which is in a soft state. The stress with the insulating support 102 on the acceleration electrode acts to increase the expansion of the electrode even more strongly, but the control electrode 101 or the acceleration electrode in the present invention is a depression (G) where the stress with the insulating support 102 is the outer portion of each electrode Absorbed by the protrusions 103 formed in the N-axis and eventually the adverse effects on the electron beam through hole 104 as well as the effect of expansion, and improves the adhesion between the insulating support 102, the control electrode 101, the acceleration electrode This can eliminate the change in the P direction.

In fact, when the voltage is applied to the heater, the amount of expansion of the cathode is 62 μm, the amount of expansion of the control electrode 101 is 12 μm, and the amount of expansion of the acceleration electrode is about 23 μm. The expansion amount of the control electrode 101 and the acceleration electrode can be said to be mostly due to the stress between the insulating support 102.

In addition, the protrusions 104 applied to the present invention as shown in FIGS. 6A, 6B, and 3C form a plurality of protrusions 1041 or various shapes of the protrusions 104. It can be formed into a shape to bring about the effect of removing the stress.

As described above, according to the present invention, the change of the cathode current by the control electrode or the acceleration electrode becomes small, and thus, the overshoot characteristic amount (B '/ A' x 100) has an effect of 35%.

Therefore, the settling time can be shortened, and a considerable effect can be obtained in the reliability improvement, and the change in the P direction can be eliminated by improving the welding force between the insulating support, the control electrode, and the acceleration electrode, thereby improving overall quality and reliability of the cathode ray tube. Since it produces good results over time, various characteristics of the cathode ray tube can be configured and manufactured as originally designed, and thus, the resolution characteristic of the cathode ray tube can be improved.

Claims (3)

A triode consisting of a control electrode for controlling hot electrons generated from a cathode part emitting hot electrons and an accelerating accelerating electrode, and an acceleration and focusing electrode for accelerating and focusing an electron beam to reach a fluorescent surface, and being positioned outside the electrodes An electron gun electrode having an electrode portion support portion inserted and fixed to a bead glass, The electrode fixing structure of the color cathode ray tube, characterized in that a protrusion protruding from the control electrode and the acceleration electrode in which a portion is recessed and fixed to the insulating support. The method of claim 1, The protrusion of the electrode of the color cathode ray tube, characterized in that formed in a cylindrical shape. The method of claim 1, The protrusion has an electrode structure of a color cathode ray tube, characterized in that the protrusion is cut into a plurality of parts.