JPH05343003A - Electron gun - Google Patents

Abstract

PURPOSE:To eliminate inferior color deviation caused by transmission of vibration by providing a bent part on a part of a protruded part of each electrode, which is embedded into a glass bead. CONSTITUTION:Holes 21R, 21G, 21B are formed on a conductive material 21, which form R lens, G lens and B lens, respectively. A protruded part 22 called bead support is formed in the periphery on the side of a glass bead 19 of a conductor material 21. The protruded part 22 is provided with a bent part 22A which is bent to the surface and the rear sides of the conductor material 21. A G1 electrode 12 thus formed is fixed while the protruded part 22 having the bent part 22A is embedded into the glass bead 19. The fixation is carried out by melting the glass bead by heating, embedding the protruded part 22 of the G1 electrode 12, and by cooling the glass bead.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun, and in particular,
The present invention relates to an improvement in the fixing structure between each electrode and the glass bead.

[0002]

2. Description of the Related Art The basic structure of an electron gun incorporated in a CRT is such that a cathode for emitting electrons is provided and a plurality of electrodes having a lens function are juxtaposed along the electron emitting direction. .

Each electrode is fixed by a glass bead so that the positional relationship of each electrode with respect to the cathode does not change.

That is, a flat protrusion extending in the radial direction of each electrode is provided in a part of the periphery of each electrode, and the protrusion is fixed by being embedded in the glass bead. ing.

FIG. 5 shows such a structure.
(A) is a plan view and (b) is a side view. A protrusion 53 is formed on the glass bead 52 side of the electrode 51, and the protrusion 53 is embedded and fixed in the glass bead 52.

Here, the electrode is fixed to the glass bead by embedding the protrusion of the electrode in the glass bead melted by heating and then cooling the glass bead.

[0007]

However, in the electron gun constructed as described above, when an impact is applied to a CRT incorporating the electron gun, the impact is transmitted and each electrode thereof vibrates independently. It has been found that color shift occurs in so-called display.

As a result of pursuing this cause, the present inventors have found the following.

That is, when the glass beads are cooled after the protrusions of the respective electrodes are embedded in the molten glass beads, the glass beads have a large coefficient of thermal expansion with respect to the electrodes, so that the glass beads shrink. Due to this, a slight gap was formed between the protrusion and the protrusion. On the other hand, since the protrusions of each electrode are formed in a so-called flat state, the electrode can be displaced with respect to the glass bead in the central axis direction, the vertical direction, and the horizontal direction.

Therefore, when vibration is transmitted to the electron gun,
The electrodes vibrate with respect to this electron gun (more accurately, the glass beads), and the trajectory of electrons from the cathode due to each electrode is deviated, which causes color misregistration.

The present invention has been made under such circumstances, and an object thereof is to provide an electron gun which eliminates so-called color misregistration defects due to transmission of vibration.

[0012]

In order to achieve such an object, the present invention basically provides a plurality of electrodes arranged in parallel in the direction of the central axis with their central axes aligned. In an electron gun having a plurality of glass beads arranged around each of the electrodes and extending in parallel with the central axis, the glass beads being embedded with the protrusions of the electrodes to fix the electrodes. The projection of each of the electrodes has a bent portion in a portion embedded in the glass bead.

[0013]

In the electron gun constructed as described above, since the bent portion is formed in the portion where the projection of each electrode is embedded in the glass bead, it is ensured that the electrode and the glass bead are fixed to each other. Become.

Even if a glass bead is melted and the projection of the electrode is embedded in the molten glass bead and the glass bead shrinks during cooling to form a slight gap between the projection and the projection, the projection This is because the bent portion ensures sufficient restraint with respect to the glass beads and prevents so-called rattling.

Therefore, even if a shock is applied to the CRT incorporating the electron gun and the shock is transmitted to the electron gun, the vibration of the electrode with respect to the electron gun (more accurately, the glass bead) does not occur.

Therefore, since there is no deviation in the trajectory of electrons from the cathode due to each electrode, so-called color misregistration defects can be eliminated.

[0017]

First, FIG. 3 is a sectional view showing an embodiment of a color CRT to which an electron gun according to the present invention is applied.

In FIG. 1, there is an electron gun 7, and the electron gun 7 is adapted to irradiate electrons whose trajectory is controlled on the left side in the figure, as will be described later in detail. And
The electrons from the electron gun 7 pass through the inner shield 9.

The electrons that have passed through the inner shield 9 collide with the phosphor screen 4 through the shadow mask 5, and the phosphor screen 4
Is designed to emit light.

Then, there is an envelope made of the electron gun 7, the inner shield 9, the shadow mask 5, and a glass covering the fluorescent screen 4, and the envelope is a panel 3 arranged on the fluorescent screen 4 side. It is composed of a funnel 6 which is connected to the panel 3 and has a closed shape so as to include the electron gun 7.

Reference numeral 8 in the drawing denotes an inner shield 9
It is a support frame that supports such things.

FIG. 4 is a schematic diagram showing an embodiment of the electron gun 7 according to the present invention. Note that the electron gun 7 in this figure is shown in a laterally reversed manner from that shown in FIG.

In the figure, there is a cathode 11 arranged on the central axis, and electrons are emitted from this cathode 11. The G ₁ electrode 12, the G ₂ electrode 13, the G ₃ electrode 14, the G ₄ electrode 15, and the G ₅ electrode ₅ along the electron emission direction, that is, along the right direction in the drawing.
The electrode 16 and the G ₆ electrode 17 are sequentially arranged.
Each of these electrodes 12 to 17 has a function of controlling the acceleration of electrons and the trajectory of the electrons.

Then, each of the electrodes 12 to 17
The electrons that have passed through pass through the shield cup 18.

A stem 10 is arranged at the end portion on the cathode 11 side, and an extraction electrode connected to the cathode 11 and each of the electrodes 12 to 17 is taken out from the stem 10.

Further, each of the electrodes 12 to 17 is fixed to a glass bead 19 extending and arranged in parallel with the central axis.

Next, the structure for fixing the electrodes to the glass beads 19 will be described in detail.

FIG. 2 (a) is a plan view showing an embodiment of the G ₁ electrode 12, and FIG. 2 (b) is a side view thereof.

In the figure, three holes 21R, 21G, and 21B are formed in the conductor material 21, and each of them is R in sequence.
Lens, G lens, and B lens.

Then, a protrusion 22 called a so-called bead support is formed on the side of the conductive material 21 on the glass bead 19 side. The protrusion 22 is integral with the conductor material 21, for example, and is formed simultaneously by press molding or the like.

Further, as shown in FIG. 2B, the protrusion 22 is formed to have a bent portion 22A that is bent on the front and back surfaces of the conductor material 21.

As shown in FIG. 1, the G ₁ electrode 12 thus constructed has the protrusion 2 having the bent portion 22A.
2 is fixed while being embedded in the glass bead 19.

Such fixing is carried out by heating the glass beads 19 into a molten state, embedding the protrusions 22 of the G ₁ electrode 12, and then cooling the glass beads 19.

1 and 2, only the fixing of the G ₁ electrode 12 to the glass bead 19 is shown, but the other electrodes 13 to 17 have the same structure.

Electron gun 7 constructed as in the above-described embodiment
Since the bent portion 22A is formed in the portion where the projection 22 of each electrode 12 to 17 is embedded in the glass bead 19, the fixation of each electrode 12 to 17 and the glass bead 19 is ensured. Become.

After the protrusion 22 of the electrodes 12 to 17 is embedded in the molten glass bead 19, the glass bead 19 contracts during cooling and the protrusion 22
This is because, even if a slight gap is formed between the two, the projection 22 is bent, so that the glass bead 19 is sufficiently restrained and so-called rattling does not occur.

Therefore, even if a shock is applied to the CRT incorporating the electron gun 7 and the shock is transmitted to the electron gun 7, the electrode vibration with respect to the electron gun 7 (more accurately, the glass bead) does not occur. Become.

Therefore, since there is no deviation in the trajectory of the electrons from the cathode 11 due to the electrodes 12 to 17, it is possible to eliminate the so-called color misregistration defect.

In the embodiment described above, the electrodes 12 to 17 are
The present invention is applied to the above, but the backlash of the electrode with respect to the glass bead 19 particularly affects the color misregistration, because the G ₁ electrode 12 disposed in the vicinity of the cathode 11 has only this. It goes without saying that it may be applied to the G ₂ electrode 13 as well.

[0040]

As is clear from the above description,
According to the electron gun of the present invention, it is possible to eliminate a so-called color shift defect due to transmission of vibration.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an electron gun according to the present invention, and a side view showing an embodiment of a structure for fixing an electrode to a glass bead.

2A and 2B are configuration diagrams showing an embodiment of an electrode used in an electron gun according to the present invention, FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is a color C to which the electron gun according to the present invention is applied.
It is sectional drawing which shows one Example of RT.

FIG. 4 is a schematic configuration diagram showing an embodiment of an electron gun 7 according to the present invention.

FIG. 5 is an explanatory view showing an example of a conventional electron gun,
(A) is a plan view showing an example of a structure for fixing an electrode to a glass bead, and (b) is a side view.

[Explanation of symbols]

7 ... Electron gun, 10 ... Stem, 11 ... Cathode, 12-1
7 ... Electrode, 18 ... Shield cup, 19 ... Bead glass, 22 ... Protrusion (beat support), 22A ... Bending part.

Claims (1)

[Claims] 1. A plurality of electrodes arranged in parallel in the direction of the central axis with their central axes aligned with each other, and a plurality of glass beads arranged around each of the electrodes arranged in parallel and extending parallel to the central axis. The glass bead has an electron gun for fixing the electrodes by embedding the protrusions of the electrodes, and the protrusions of the electrodes have a bent portion at a portion embedded in the glass beads. An electron gun that is characterized by being.