JPH01255135A - In-line type electron gun - Google Patents

Abstract

PURPOSE:To provide high accuracy assembly of an electrode for an in-line type electron gun by furnishing a longitudinally stretching hollow part in the central part of the cross section of insulation supporting rods at least partially. CONSTITUTION:An electrode embedding width l2 orthogonally intersecting the longitudinal direction of insulation supporting rods 36 which support and fix component electrodes 11-14 and neg. electrode structures 10A, 10C of an electron gun 3 shall be wide so as to satisfy the relation l2>2S with respect to the electron gun mutual distance S. This gives sturdy supporting of the component electrodes with respect to the insulation supporting rods 36. A hollow 36D in the form of approx. rectangle is formed in the center of insulation supporting rods 36 in their longitudinal direction, and the section area of the insulation supporting rods 36 becomes smaller than in the case with no hollow 36D, and its weight and heat capacity are also lessened. This accomplishes an in-line type electron gun equipped with lightweight insulation supporting rods, wherein the assembly accuracy of component electrodes can be held at high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-line electron gun used in a color cathode ray tube.

[Conventional technology]

Recent color cathode ray tubes have a cathode structure that generates three electron beams individually, and an integrated cathode structure that is electrically and structurally common and that forms a substantially separate or common electron lens for each electron beam path. In-line electron guns equipped with electrodes are widely used.

FIGS. 4(a) and 4(b) are a side view and a sectional view taken along the line A' of an example of a conventional electron gun.

As shown in FIGS. 4(a) and 4(b), the electron gun 1 is
Three cathodes 10A, 10B, 10C are insulated from each other and arranged in a line with equal distances S in the same plane (however,
10B (not shown), and three electrically common electron beam transmission apertures arranged sequentially in the direction of electron beam propagation opposite thereto and nine G1 electrodes 1.
1. G2'llC pole 12°G3 electrode 13. It is composed of M poles 14, and each electrode supporter is embedded and fixed in two insulator support rods 16 to maintain a predetermined electrode spacing.

For example, in the case of the 03 electrode 13 in the form of a closed cylinder, the electrode support is formed integrally with the brim 13A, as shown in FIG. (When buried, the structure of the device electron gun 1 consists of four quadrupole supports 13B with notches to increase the fusion strength.) The mutual positions of the L poles of the electron gun High precision must be maintained in order to set the emission characteristics, focusing, and concentration characteristics to predetermined characteristics.In particular, recent color cathode ray tubes are used for high-density display of various types of information. In this case, the electron beam characteristics become increasingly important, and in order to achieve this, it is necessary to maintain the relative positions of the constituent electrodes with even higher precision. Electrode supporter 13 for the rod
The distance t1 between B is increased, and insulator support rod 1 is increased accordingly.
6 burial widths! 2 to ensure support for each electrode.

FIG. 5(a), (li is a side view and a sectional view taken along the line AA' of another example of a conventional electron gun.

Alternatively, as shown in FIG. 5 (ω, (υ), the electron gun 2 is
Each constituent electrode has four 1! It has pole supports 13B, each of which is independently embedded in four insulator support rods 17,
Support is fixed. In order to improve the focusing characteristics of this electron gun 2, the distance S between the three electron guns is widened, and the main electron lens electrodes G3 and G4 [poles 13, 14+7
) If the hole diameter is large @ < L*m, both row side cathodes 10A, 10
C, and is suitable for reliably supporting the electron beam apertures on both row sides.

That is, the distance between the electrode supports 13B! 3 in Figure 4(a).

(By setting the tl to be larger than the tl of the electron gun 1 shown in the figure, it becomes possible to support the portions close to the openings on both row sides.

[Problem to be solved by the invention]

However, in the above-mentioned conventional electron gun 1 shown in FIG. Burying width of support rod 16! 2, when assembling the constituent electrodes of the electron gun, when the insulator support rod 16 is heated and softened with a burner, the heat capacity becomes extremely large, and the time for heating and softening with the burner becomes longer than before, reducing the assembly work time. This becomes uneconomical as it increases the amount of heat and wastes burner heating energy.

Alternatively, because the buried @l z is large, the insulator support rod 16
becomes unevenly softened, and when the temperature returns to room temperature after the electrode support 13B is embedded and fixed therein, distortion may remain in the insulator support rod 16, and an accident may occur in which the insulator support rod 16 cracks. . Furthermore, since the buried width is increased, the weight increases, which is also disadvantageous in that it is not preferable for supporting the constituent electrodes of the electron gun inside the cathode ray tube.

On the other hand, in the electron gun 2 shown in FIG.
It becomes difficult to embed B, and the constituent electrodes may become twisted, and the three perforation planes in the constituent electrodes may deviate from the same plane, and even if the electrode support strength of the constituent electrodes of the electron gun is improved, , assembly accuracy is not suitable. Alternatively, there is a drawback that the number of insulator support rods 17 increases to four, which complicates the assembly work, which is not desirable.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-line electron gun that is capable of maintaining the assembled N degree of the constituent electrodes of the in-line electron gun with high precision and is equipped with a lightweight insulator support rod.

[Means to solve the problem]

The present invention includes a plurality of constituent electrodes and a plurality of t/l! which support and fix the plurality of constituent electrodes. In an in-line electron gun having three edge support fixtures, a hollow portion extending in the longitudinal direction is provided in at least a part of the center of the cross section of the insulator support rod.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (ω, (b) is a side view and a sectional view taken along the line AA' of the first embodiment of the present invention, and FIG. 2 is a perspective view of the insulator support rod of FIG. 1.

In the first embodiment, as shown in FIGS. 1(a), (b) and 2, the viewing pole structures 10A, I
The polarization buried width t2, which is perpendicular to the longitudinal direction of the two insulator support rods 36 that support and fix the OB, IOC, and constituent electrodes 11 to 14, satisfies the relationship A2>28 with respect to the electron gun mutual spacing S. It is so wide. Therefore, for example, the distance between the two sets of electrode supports 13B that are integrally formed on the brim 13A of the G3 electrode 13 of the cold-closing cylindrical body can be increased to nearly 28, and the distance between the insulator support rods 36) can be increased. On the other hand, the support of the L pole becomes strong, and the support at the openings on both row sides is also stable.

On the other hand, in the center along the longitudinal direction of the insulator support rod 36, a hollow portion 36D having a generally rectangular cross-sectional shape is formed.

From this f, the cross-sectional area of the insulator support rod 36 is
It is smaller than without D, and its weight and heat capacity are also smaller. Therefore, when heating and softening the insulator support rod 36 with a burner when assembling the constituent electrodes of the electron gun, the heating and softening is effective, easy, and without wasting energy.
-, the i-pole supporter of the constituent electrode is buried, and even if it returns to room temperature and hardens, no strain remains on the insulator support rod 361, making it possible to prevent cracking. Also, since the center of the insulator support rod 36 is hollow, its weight is reduced, and the electron gun 3 can be attached to the neck section ζ of the cathode ray tube.
It is also advantageous to support this.

FIG. 3 is a perspective view of an insulation/object support rod according to a second embodiment of the present invention.

In the second embodiment, as shown in FIG.
The outer shape of 6 is the same as that of the first embodiment, but the hollow portion having a generally rectangular cross section formed at the center along the longitudinal direction does not penetrate through the hollow portion 46 DI , 46 .
D2 f is separated, and its node is, for example, the G1 electrode, 02
If it is provided in the vicinity of the buried part where # and f of the electrode supporter of the electrode are buried, the support strength will be even stronger and precise assembly accuracy can be guaranteed.

In the electron gun having the above structure, when the hole-perforation surface of the closed cylindrical electrode is enlarged, for example, the neck diameter of the cathode ray tube in which the electron gun is sealed is φ29. The design used in I III is φ
36.51m+used for enlarged neck use, and
This is particularly effective when the electrode is supported by two insulator support rods.

In the above embodiment, the case where the main electron lens of the electron gun adopts the Bury potential focusing method is explained, but it goes without saying that this embodiment is also applicable to other methods, such as a multi-stage focusing method. do not have.

Furthermore, it goes without saying that this embodiment can also be applied to an electron gun in which the constituent electrodes of the electron gun are not integrated electrodes, but are composed of separate and independent constituent electrodes.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to maintain high assembly accuracy of the constituent electrodes of an in-line type electron gun equipped with integrally fixed electrodes, and to provide insulator support without impairing the economic efficiency of the assembly work. This has the effect of making it possible to obtain an in-line electron gun equipped with a rod.

[Brief explanation of the drawing]

FIG. 1 (rolled), (b) is a side view and cross section taken along the line A-A' of the first embodiment of the present invention, FIG. 2 is a perspective view of the insulator support rod in FIG. 1, and FIG. is a perspective view of an insulator support rod according to a second embodiment of the present invention; FIGS. 4(a) and 4(b) are a side view and a cross-sectional view taken along line A-A' of an example of a conventional electron gun; FIG. (a). (υ is a side view and a sectional view taken along line A-A' of another example of a conventional electron gun. 1.2.3...Electron gun, IOA, IOC...
...Cathode structure, 11...G1 electrode, 12...
...G2 electrode, 13...G3m pole, 14.
...Pole in G4, 13A...Flamiform edge, 13
B... Electrode supporter, 16.17°36.46.
...Insulator support rod, 36D, 46Dl. 46D2...Hollow part. Agent: Susumu Uchihara, patent attorney d)
(1:l) Article 42 Porridge,, s2

Claims (1)

[Claims] In an in-line electron gun having a plurality of constituent electrodes and a plurality of insulator support rods that support and fix the plurality of constituent electrodes, at least a portion of the central portion of the cross section of the insulator support rod is provided with a An in-line electron gun characterized by an extended hollow section.