JPS5841720Y2 - electron gun - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electron gun configured so that the electron gun assembly can be reliably assembled by welding.

FIG. 1 is a sectional view showing the outline of the electron gun main lens section in a conventional color picture tube. In the figure, 1 indicates the electron gun main lens section, and a pair of insulating supports 2 and Third grid electrodes 3 each embedded with a gap
1.32 and the fourth grid electrode 41.42 and the fifth grid electrode 51
．． 52 and a sixth grid electrode 6.

Here, since the length of the fifth grid electrode 51 and 52 of the main lens part of the electron gun is long, the auxiliary electrode 7 is used to improve the focusing characteristics.
1.72 is provided.

Figure 2 shows the fifth grid electrode 51.52 and the auxiliary electrode 71.72.
FIG. 2 is an enlarged view of a portion embedded in an insulating support 2. FIG.

However, when such an assembly is constructed, if the welding conditions are not appropriate when welding the flanges of the fifth grid electrodes 51 and 52 together, insufficient welding may occur and the focus characteristics may deteriorate, or conversely, the welding conditions may deteriorate. is too strong, resulting in welding cracks and the like, resulting in a significant deterioration of withstand voltage characteristics.

Further, it has the disadvantage that the insulating support 2 may crack when it is embedded in the insulating support 2.

This invention was devised to eliminate the above-mentioned drawbacks, and involves protruding welding protrusions from one or both flanges of a pair of grid electrodes, welding the protrusions to the opposing flanges, and further By holding the flange portion of the auxiliary electrode between the flange portions, welding conditions can be easily selected, and an electron gun with good workability and reliable welding is provided.

An embodiment of this invention is shown in Figs. 3 and 4, respectively.
It is shown and explained in the figure.

As shown in FIGS. 3 and 4, welding protrusions 5 are provided on either or both flange portions of the fifth grid electrode 51, 52.
1a and 52a are provided in a protruding manner, and the protruding portions 51a and 52a are welded to opposing flanges.

Further, the flange portions of the auxiliary electrodes 71, 72 are smaller than the flange portions of the fifth grid electrode 51, 52, and these are located outside the support 2 between the pair of insulating supports 2. It is configured to be held between the flange portions of 52.

With this configuration, the fifth grid electrode 51.5
The welding area between the two parts becomes smaller, making welding easier, and defects such as insufficient welding and welding flashes do not occur.

Further, there is no need to embed the flange portions of the auxiliary electrodes 71 and 72 in the insulating support 2, and the number of embedded parts can be reduced, so that cracks and cracks in the insulating support 2 do not occur.

FIG. 5 is an enlarged sectional view showing another embodiment of this invention, in which the welding protrusions 51a, 52a of the fifth grid electrode 51.52 are removed without reducing the flange portion of the auxiliary electrode 71.72.
A hole is drilled in the flange part of the part facing the.

By bringing the surfaces of the fifth grid electrodes 51 and 52 into contact in this manner, the same effect as described above can be obtained.

In each of the above embodiments, the case where two auxiliary electrodes 71.72 are sandwiched between the fifth grid electrodes 51.52 has been described, but this invention is not limited to this, and the auxiliary electrodes 71.72 are
This may be applied when any one of these is used.

As explained above, in this invention, the flange part of the grid electrode constituting the main lens is welded with a welding protrusion provided thereon, and the flange part of the auxiliary electrode is held between the flange part, so that the welding conditions are This makes it easier to select, which improves assembly workability and has the effect of greatly improving the withstand voltage characteristics of the picture tube.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the main lens of an electron gun in a conventional color picture tube, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Figs. 3 and 4 each show an embodiment of this invention. FIG. 5 is an enlarged sectional view of the main part showing another embodiment of this invention. In the figure, 1 is the electron gun main lens part, 2 is an insulating support,
51.52 is the fifth grid electrode, 71.72 is the auxiliary electrode, 5
1 a and 52 a are welding protrusions of the fifth grid electrode. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an electron gun having a plurality of electrodes whose flange portions are embedded and fixed in a plurality of insulating supports with predetermined gaps, each flange portion has a protrusion protruding from at least one opposing surface. and a pair of grid electrodes whose protruding portions are welded to opposing flanges, and an auxiliary electrode whose flange portions are held by the outer portions of the welded portions of the flange portions of the pair of grid electrodes. An electronic gun.