JPS6372040A - Electron gun structure - Google Patents

Abstract

PURPOSE:To prevent deformation of the 6th electrode so as to eliminate deterioration of characteristic thereof by arranging a flange extending toward the tube axis on the end face on the cathode electrode side of the 6th electrode. CONSTITUTION:An end 8(a) of a support 8 is fixed to the head of G4 support 9, and the other end 8(b) of the support 8 is fixed to the 6th electrode 16. The 6th electrode is provided on the end face 16(a) on the side of a cathode electrode K, with a flange 16(b) protruding toward the tube axis. By this method, strength of the electrode 16 can be increased; deformation of the electrode 16 in transportation and assembly work is prevented; and deformation in inserting into a bulb is prevented in addition; which makes it possible to eliminate deterioration of characteristic that accompanies deformation.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electron gun holder f for a cathode ray tube.

[Conventional technology]

Electron guns for cathode ray tubes (; Various types of structures are used, but in the electron gun structure shown in Fig. 3, a first
~6th electrodes 1 to 6; among these electrodes 1 to 6, the first to fifth electrodes 1 to 5 are held insulated from each other by an insulating support rod 7; The portion 5a is inserted into the sixth electrode 6. Reference numeral 8 denotes a support, and the support 8 has one end 8a fixed to the fourth electrode 4 and the other end 8b fixed to the sixth electrode 6I to hold the sixth electrode and to maintain electrical continuity between the fourth and sixth electrodes. is running.

A plurality of supports 8 are equally distributed on the circumference.

In the electron gun assembly having such a structure, an anode voltage is applied to the sixth electrode 61 through a valve spacer contact (not shown), and the fifth electrode 1 has a focus of - several times the anode voltage. A voltage is applied.

Note that an electron gun assembly in which electrodes are partially overlapped is disclosed in, for example, Japanese Patent Laid-Open No. 58-147942.

[Problem that the invention seeks to solve]

In the conventional electron gun assembly as shown in FIG. Not much consideration was given to strength, leading to deformation of the electrode and
There was a problem of deterioration of characteristics associated with this.

That is, the sixth electrode 6 is a cylindrical electrode, and a plurality of boats 8 are normally welded and fixed to the side end 6a of the cathode electrode. A valve spacer contact (not shown) is welded and fixed to the fluorescent surface side end 6bf of @6, but the sixth electrode 6 receives a force when inserting this electron gun assembly into the bulb.
There was a problem of deterioration of characteristics due to deformation, etc. Furthermore, since the fifth electrode 5 is disposed inside the sixth electrode 6, deformation of the sixth electrode poses a particular problem.

An object of the present invention is to provide an electron gun assembly in which deformation of the sixth pole is prevented and the characteristics are not deteriorated.

[Means for solving problems]

The above object is achieved by reinforcing the cathode electrode side end of the cylindrical sixth electrode.

[Effect]

By reinforcing the cathode side end of the sixth electrode,
This can prevent deformation when welding and fixing to the support during transportation, and furthermore, the pole side end of the cand can be prevented from being deformed by the force received when inserting the electron gun assembly into the valve. Since there is no deterioration in the roundness of the sixth electrode, deterioration of characteristics can be prevented.

〔Example〕

FIG. 1 is a partially cutaway plan view showing an embodiment of the electron gun assembly of the present invention, and the same parts as in FIG. 3 are given the same symbols.

In Figure M1, one end 8a of the support 8 is fixed to the head of the G4 support 9, and the other end 8b of the support 8 is fixed to the sixth electrode 16. This 6'α pole 16 is connected to the end 16 on the side of the cathode electrode, as shown in Figure 2 in detail.
A has a flange 16b that projects toward the tube axis. Also, this sixth electrode 16 (MIt light WI side end 16C)
In one case, a valve spacer contact (not shown) is fixed, and serves to position the electrode and establish electrical continuity.

In such a sixth electrode 16 inches, the flange 16
The maximum value of the protrusion dimension l of b is preferably such that at least the large diameter portion 5a of the fifth electrode 5 can be inserted into the sixth electrode 6 due to voltage resistance and assembly constraints. Further, the seven flange 16b and the sixth electrode 16 are formed separately, and the end portion 16b is formed separately.
Of course, it may be used in combination with 6a. Note that 14a is a flange of the fourth electrode.

In this embodiment, the electrodes include a cathode electrode and the first to third electrodes.
Although the explanation has been made using the 6th N pole, it goes without saying that other electrode configurations may be used.

〔Effect of the invention〕

According to the present invention 1, the end portion 1 of the electrode to which the spacer is fixed
By providing this flange, the strength of the electrode can be improved, and deformation of the electrode during transportation, assembly, etc. can be prevented.
Furthermore, it is possible to prevent deformation at one point during insertion into the valve, thereby eliminating deterioration in characteristics due to deformation. Also, since the 7 lunges protrude toward the tube axis, getter flash f
It is also possible to control the accompanying scattering of the getter material, and the withstand voltage characteristics can also be improved. Furthermore, the relative dimensions with respect to the electrode inserted inside can also be secured.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing an embodiment of the electron gun assembly of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is an example of a conventional electron gun groove body. FIG. 3 is a partially cutaway plan view. 1...First electrode, 2...Second electrode, 3...
...3rd electric bullet, 5...5th electrode, 7...
・Insulation support, n, 8...Support, 9...
・G4 support, 4.14...4th electrode, 6
．． 16...6th electrode, 16b...7 lunge,
K...Cathode electrode, l...Flange protrusion dimension.ゝ＼

Claims (1)

[Claims] 1, comprising a cathode electrode and at least first to sixth electrodes aligned substantially coaxially with the cathode electrode;
In an electron gun assembly in which an electrode and a sixth electrode are set to the same potential and a part of the fifth electrode is inserted and arranged inside the sixth electrode, an end surface of the sixth electrode on the cathode electrode side An electron gun structure characterized by having a flange facing the tube axis.