JPS6269428A - Electron gun assembly jig for color picture tube - Google Patents

Abstract

PURPOSE:To prevent parallelism degradation of electrodes and decrease dispersion of focus characteristic, by providing a slot hole, through which plural core metals can run, on a spacer without any cut which would separate the spacer's end portion away from the core metals. CONSTITUTION:A slot hole 23A, through which plural core metals 12 can run, is provided on a steel plate having a predetermined width, and both faces 23B of the spacer 23 are respectively polished for accurate thickness. With this feature of no separation of the spacer end part, bend and deformation are prevented, resulting in great decreases in parallelism degradation of electrodes and dispersion of focus characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electron gun assembly jig for an in-line color picture tube, which prevents deformation or misalignment of a spacer during use and has a long service life.

[Background of the invention]

In an in-line color picture tube, there are three
The electron gun must be configured so that the book's electron beam always scans while concentrating on the shadow mask.

Furthermore, in order to prevent variations in focus characteristics, it is necessary to accurately assemble the coaxiality, parallelism, etc. of the electrode parts constituting the electron gun. An example of a conventional assembly method is disclosed in, for example, Japanese Utility Model Publication No. 57-44590.

Fig. 2 is a side view of the essential parts of an example of an in-line type electron gun using the pi-potential focusing method. A first grid controls the amount of electron beam by a signal voltage, a second grid 2 accelerates the electron beam, a third grid 3 focuses the electron beam, and a lower third grid
It is formed by joining the grid 4 and the upper third grid 5. 6 is a fourth grid, and 7 is a multiform glass that insulates and supports each electrode constituting the electron gun.

In the above configuration, during operation of the color picture tube, OV (ground) is applied to the first grid 1, approximately 700 V to the second grid 2, approximately 7 kV to the third grid 3, and approximately 7 kV to the fourth grid 6.
A high voltage of approximately 25 kV is applied to the.

These voltages cause the apertures provided in each electrode to form electrostatic lenses with the apertures in the opposing electrodes, and focus the electron beam emitted from the cathode onto the fluorescent surface of the color picture tube. .

Variations in the focus characteristics of color picture tubes depend on the accuracy of the electron gun, and some may become defective due to deterioration in the mutual parallelism of electrode parts and the coaxiality of the apertures.

Defects in assembly accuracy of electron guns usually occur during the beading process, and FIG. 3 shows a side sectional view of an electron gun mounted on a beading jig.

In the same figure, a plurality of core bars 12 set on a substrate 11 have a fourth grid 6 to which a support 6A is attached in advance, a flange portion 4A of each of a lower third grid 4 and an upper third grid 5, and 3rd group 117 assembled by welding and fixing 5A
The respective openings of the first grid 1 to which the grid 3, the second grid, the grid 2 and the support IA are attached fit together, and between each electrode,
Plate-shaped spacers 13, 14, and 15 each having a predetermined thickness.
are clamped and held by applying pressure from above with a presser foot J6.

Such a beading jig is placed on a beading machine, and the multiform glass 7, which has been softened by heating to 1000 to 1200°C, is pressed onto the support portion of each electrode, so that each electrode is insulated from each other. Be in a supported state.

Here, a conventional spacer 13t having a thickness of about 1 inch is exemplified.As shown in FIG. is smooth and sharp.

Beading jigs are used repeatedly, but
While the temperature rises during the press-bonding of the multiform glass and the cooling is repeated to make the electrodes easier to remove, the spacer 13 becomes deformed as shown in FIG. 5.

This is probably caused by repeated temperature rises and falls, and the sides 13C of the notch 13A, which protrude for quite a long time, come into contact with other objects when removing the electron gun assembly from the jig. However, the cause has not been clearly determined.

However, the part where the notch 13A is cut is the core metal 1.
2 is present, and this is the location where it is most important to perform its function as a spacer. If the end 13G of the spacer 13 is deformed into a curve at that point as shown in FIG. The degree of deformation is so severe that it loses its original function (
If the spacer is used in a continuous space, only one side of the spacer will contact the opposing surfaces of the fourth grid 6 and the upper third grid 5, so the spacer will be pushed to one side by the margin of each electrode opening and core metal. The mutual parallelism deteriorates. These parallelisms can be corrected by significantly increasing the pressing force of the presser bar 16 of the beading jig, but in this case, a large force is required to pull out the spacer after beading, so it is difficult to correct other parts. It is not practical because it has side effects such as deformation and damage to the electrode surface in contact with the spacer.

[Purpose of the invention]

An object of the present invention is to provide an electron gun assembly that can assemble an electron gun for an in-line color picture tube with less variation in focus characteristics by preventing the deterioration of parallelism between electrodes that occurs in the conventional beading process. The goal is to provide jigs.

[Summary of the invention]

In order to achieve the above object, in the present invention, the end of the spacer of the electron gun assembly jig used in the beading process is provided with a long hole through which a plurality of core metals can pass side by side without cutting off the spacer in order to escape the core metal. It was set as 5゛6. Although the difference from conventional products seems to be slight, the resistance to deformation when it comes into contact with other objects is much stronger, and the number of defects caused by the ``dipping'' process is significantly reduced.

[Embodiments of the invention]

FIG. 1 shows a spacer 23 for a beading jig according to the present invention.
A steel plate of a predetermined width is provided with elongated holes 23A through which a plurality of core metals 12 pass, and both surfaces 23B of the spacer 23 are polished to an accurate thickness. If the front end of the spacer is not cut off in this way, it will naturally be prevented from deforming in opposite directions on both sides of the groove as in conventional spacers, and will generally be less likely to curve or deform.

In addition, since the ends of the spacer are not separated, it takes some effort to arrange the spacer, especially to remove it after beading, as it can only be done after removing the core metal, but in order to improve the parallelism of the electrodes. is unavoidable.

〔Effect of the invention〕

As described above, according to the present invention, the occurrence of parallelism deterioration between electrodes can be significantly reduced by extremely simple means, and color picture tubes with less variation in focus characteristics can be mass-produced.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a spacer for a beading jig according to the present invention, Fig. 2 is a side view of main parts of an electron gun for an in-line color picture tube, and Fig. 3 is an attachment of electron gun parts to a beading jig. FIG. 4 is a perspective view of a conventional spacer for a beading jig, and FIG. 5 is a side view showing a modification of the conventional spacer for a beading jig. 1-first grid, 2-second grid, 3-third grid, 4-lower third grid, 5-upper third grid
Grid, 6--Fourth grid, 7--Multiform glass, 11--One substrate, 12- Core bar, 13.
14.15-- Spacer, 16- Presser bar, 23-
-111 Spacer according to the present invention, 23 Agent Patent Attorney Katsuma Ogawa j1 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an in-line color picture tube electron gun, a plurality of core metals are fitted to a plurality of electrodes having three openings arranged in a straight line to determine the lateral position of each, and a spacer is placed between each of these electrodes. While maintaining a predetermined distance in the vertical direction, the support portion protruding outward from each electrode is press-fitted into a plurality of heat-softened multi-foam glasses, and the electrodes are insulated from each other at predetermined relative positions. An electron gun assembly jig for performing a beading process for supporting and fixing the electron gun, characterized in that one or more of the spacers is provided with one elongated hole through which a plurality of the core metals are lined up and passed through. Electron gun assembly jig.