JPS6367733B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electron gun assembly device that prevents the occurrence of cracks and breaks in the cathode support of an electron gun and bead glass supporting a plurality of electrodes.

FIG. 1 is a side view of a conventional in-line electron gun for a color cathode ray tube, and FIG. 2 is a view taken along the line AA in FIG. In these figures, the electron gun includes three sets of cathodes 1 that emit thermionic electron beams, a cathode support 2 that supports the cathodes 1, a first grid electrode 3, and a second grid electrode for controlling the amount of electron beams. Electrodes 4 and 3
A third grid electrode 5, a fourth grid electrode 6 for focusing and concentrating the electron beam on the screen of the cathode ray tube, and these cathode supports 2 and the first to fourth grid electrodes 3 to 6 are arranged at predetermined intervals. It consists of a pair of bead glasses 7, 7 which are electrically insulated and mechanically integrally connected and supported. A heater support 8 supports a heater (not shown) provided within the cathode 1.

In order to configure the electron gun as described above, first, as is already well known, the cathode support 2, the first to fourth grid electrodes 3 to 6 are mounted on a bead assembly jig (not shown).
After inserting and positioning the bead glass 7, the inner surface 7a of the bead glass 7 is heated and softened by a gas burner (not shown), and the softened inner surface 7a is covered with the cathode support 2 and the first to fourth grid electrodes 3 to 6. It is necessary to implant the protruding fixing piece 9 by pushing it. A cross-sectional view of this state is shown in FIG.

FIG. 4 shows the positioning of the bead glass 7,
A perspective view of the baking table 10 for pressing the inner surface 7a against the fixing pieces 9 of the cathode support 2 and the first to fourth grid electrodes 3 to 6 as described above is shown. This baking table 10 is provided with a bead glass positioning groove 10a, but since both side surfaces 10b of this groove 10a prevent the expansion of the bead glass 7 due to the pushing of each fixing piece 9, stress is applied to the bead glass 7. remains,
Defects 11 (FIG. 2), such as cracks and breaks, sometimes occur in the bead glass 7 during the heat process of the cathode ray tube manufacturing process.

This invention was made in order to eliminate the above-mentioned drawbacks, and by partially removing the side surface of the bead glass positioning groove of the baking table in correspondence with the cathode support and the fixing pieces of each electrode, the bead glass The purpose of the present invention is to provide an electron gun assembly device that reduces the residual stress of the bead glass and prevents the occurrence of cracks and breaks in the bead glass.

Embodiments of the present invention will be described below based on the drawings.

FIG. 5 is a side view of an electron gun assembled by an electron gun assembly apparatus according to an embodiment of the present invention, and corresponds to FIG. 2. In this figure, components having the same functions as those shown in FIG. 2 are denoted by the same reference numerals, and therefore their description will be omitted.

FIG. 6 is a perspective view of the burner table of the electron gun assembly device. This baking table 10 has a bead glass positioning groove 1.
0a is provided, and both side surfaces 1 of the groove 10a are provided.
0b and 10b are partially removed to correspond to the fixing pieces 9 protruding from the cathode support 2 and the first to fourth grid electrodes 3 to 6, respectively, shown in FIG. 1
0c and 10c are the removed portions.

FIG. 7 is a diagram showing the use state of the baking table 10, and FIG. 8 is a sectional view taken along the line CC in FIG. As can be seen from this, the bead glass positioning groove 1 of this baking table 10
A bead glass 7 is fitted to 0a, and its inner surface 7
When the cathode support 2 and the fixing pieces 9 of the first to fourth grid electrodes 3 to 6 are pushed into the inner surface 7a, both side surfaces 7b of the bead glass 7 are heated and softened. , 7b is the convex portion 7 in FIG.
As shown in b, it partially expands and escapes to the removed portions 10c, 10c of the bead glass positioning groove 7a.
This reduces the residual stress in the bead glass 7,
The bead glass 7 is prevented from cracking or breaking.

As shown in FIG. 6, the removed portion 10c of the bead glass positioning groove 10a is set to a length l corresponding to all the fixing pieces 9, but the removed portion 10c is made to correspond to each fixing piece 9 individually. can be provided. In this case, the expansion of the bead glass 7 is particularly large in the three fixed pieces 9 of the cathode support 2, first grid electrode 3, and second grid electrode 4 that are close to each other.
The groove removal parts corresponding to the three fixing pieces 9 can be made into one large removal part.

As explained above, according to the electron gun assembly apparatus of the present invention, the residual stress of the bead glass can be reduced,
It has the effect of preventing cracks and cracks in bead glass.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional electron gun, and Figure 2 is a side view of a conventional electron gun.
3 is a sectional view taken along line BB of FIG. 1, FIG. 4 is a perspective view of a conventional grilling table, and FIG. A side view of the gun, FIG. 6 is a perspective view of the firing stand of an electron gun assembly device according to an embodiment of the present invention, FIG. 7 is a view of the firing stand of FIG. 6 in use, and FIG. FIG. 2... Cathode support, 3-6... Electrode, 7... Bead glass, 7a... Inner view, 9... Fixed piece, 1
0... Baking stand, 10a... Bead glass positioning groove, 10b... Side part, 10c... Removal part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A cathode support and a plurality of electrodes are arranged between a pair of bead glasses with a predetermined gap maintained, and the inner surface of each bead glass is heated and softened,
In the assembly process of an electron gun in which the cathode support and the electrode fixing piece are implanted into the inner surface by pressing, the bead glass is positioned and pressed against the cathode support and the electrode fixing piece. An electron gun assembly device characterized in that a side surface of the bead glass positioning groove of the stand is partially removed in correspondence with the fixing piece.