JPS6180738A - Electron gun for cathode-ray tube - Google Patents

Abstract

PURPOSE:To easily set opposing electrodes and auxiliary electrodes with high density by providing a staircase portion to the side wall of opposing electrode and providing spacers to such staircase portion. CONSTITUTION:A fourth grid 14 is inserted into three reference pins 50a, 50b, 50c. Next, a horseshoe shaped first spacer 81 is placed at the staircase portion of a fourth grid 14 and a horseshoe shaped second spacer 82 is placed on the first spacer 81. Next, the one of auxiliary electrodes 20 is inserted in such a way that an aperture is aligned with the staircase portion 801 of horseshoe shaped spacer 82, and the one auxiliary electrode is placed thereon. Next, a horseshoe shaped spacer 83 of the second staircase portion is placed so that it is aligned with the aperture of electrode and the first horseshoe shaped spacer 84 is placed thereon. Thereafter, these spacers are inserted so that the staircase portion of third grid 13 is aligned with the horseshoe shaped spacer. After pressurization, an electrode support rod which is partly thermally fused is bonded with pressure and is then hardened by cooling. Thereafter, first the first spacers 81, 84 are pulled and then spacers 82, 83 are pulled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention includes at least one tortoise 81 of an electron gun for a cathode ray tube for focusing an electron beam of preferably μ or more! Structure C
: It is related to.

[Technical background of the invention]

For shade A-ray snow, it is equipped with at least one electron gun.
This electron gun forms an electron beam spot on a predetermined target, and one of the most important factors that determines the performance of a cathode ray tube is the spot diameter of the electron beam on the target. . It goes without saying that the smaller the spot diameter on the target, the more desirable it is.
This spot diameter is determined by the performance of the electron gun. General C: The electron gun consists of a part that generates an electron beam and a lens part that accelerates and focuses the electron beam.One effective means to improve the performance of the electron gun is to improve the performance of the lens part. be.

The main lens section is formed by coaxially arranging a plurality of electrical bridges with apertures using electrostatic lenses and applying a predetermined potential.Such an electrostatic lens has a diameter of 4 m There are several types depending on the configuration, but basically they are made by increasing the electrode aperture diameter to form a large diameter lens, or by increasing the distance between the electrodes and creating a gradual potential change to form a long focal length lens. However, it can improve lens performance.

Since an electron gun for anode rays is generally used enclosed in a thin glass cylinder, first the aperture of the 'ffl&, that is, the lens aperture is physically limited, and then the focused electric field formed between the electric In order to avoid being affected by other electric fields (: the distance between the electrodes is limited).

・First of all, when multiple electron guns are used in a line, such as in a color picture tube, the smaller the electron gun spacing Sg, the easier it is to converge the multiple beams, and the more effective the deflection is. Therefore, the apertures of the electrodes have to be made even smaller.

Therefore, we made the electrode aperture as large as possible while keeping the electron gun spacing (8 g) small, widened the distance between the electrodes sufficiently, and provided an auxiliary pole between the electrodes to reduce the influence of the undesired electric field on the inner wall of the neck. An electron gun with a shielding structure is considered. In order to eliminate the influence of the electric field of the 11 auxiliary electric gun in such an electron gun, the aperture diameter of the auxiliary type a must be set sufficiently large.

Therefore, it is necessary to make the aperture diameter of the auxiliary type & to be as large as the inner wall of the neck, and to make the distance between the electrodes sufficiently wide to provide a high-performance electron gun.

[Problems with background technology]

The electron gun structure described above has a structure that is significantly different from that of conventional electron guns because it is necessary to make the aperture diameter of the auxiliary electric machine the same as the inner wall of the neck. : Compared to this, the size of the auxiliary electrode is quite thick (
It is what happens. In addition, since it is necessary to have the effect of shielding the undesired electric field on the inner wall of the auxiliary electrode wire neck, the structure must be designed to almost completely cover the gap between the opposing electric machines. C when assembling the gun
:, positioning (especially (relative position in the -tube axis direction) of the counter electrode a and the auxiliary electrode becomes extremely difficult.

In a conventional electron gun, each type has approximately the same size, and there is a predetermined distance between each electrode. Therefore, by interposing a spacer having a predetermined thickness on the electrode facing surface to set this distance, it was possible to determine the distance between the electrodes with high accuracy (- and easily).

That is, when assembling the electron gun according to the background art, a method for setting the distance between the electrode and the counter electrode (this distance is covered by the auxiliary electric machine, so it is not visible from the outside) is as follows: It is not possible to apply a method in which the electrode is interposed between the opposite electrodes.

Here, a method can be considered in which a slit-like opening for inserting a spacer is provided in the auxiliary electrode, and two or one spacer is confined in the slit. However, with this method, it is difficult to determine the distance between the opposing X Become.

[Purpose of the invention]

An object of the present invention is to provide a battery structure in which the predetermined positions of the counter electrode and the auxiliary electrode can be set easily and in a method for assembling the ladder toy of the above structure.

[A essential point of the invention]

As a method of setting the predetermined positions of the opposing electron a and the auxiliary mold a in the electron gun according to the present invention, a step-like portion is provided on the side wall of the counter-electrode &, and this step-like portion C is interposed with a varnish vane. This is to achieve the above purpose.

[Embodiments of the invention]

11/) 1 is a schematic configuration diagram showing an embodiment of an electron gun according to the present invention. The electron gun shown in No. 1IJ is at least 1ttta, 1st grid [11], 2nd grid 2°, 3rd grid 3, auxiliary & (2[), 4th grid α, convergence scan α9, and a plurality of electrical machine support rods (consisting of IQ. Second grid σ, second grid σ
Three electron beam transmission holes are provided in a substantially flat plate-like member. It is a combination of the electrode member (131) on the second grid αa side and the electrode part 1 (132) facing the fourth grid α, with #23 openings at both ends. is provided. Each of the four auxiliary electrodes has a large oval opening at one end and an open end with a flange at the other end, forming an almost camp shape, with the flanges butted against each other. Similarly to the third grid (131), the fourth grid I is a combination of an electrode member (141) facing the third grid 131 and a main gun member (142) to which the convergence cup is connected.

A step-like portion (7) is provided on the side wall portions of the opposing electric machine parts H (132) and (141) of the third grid αJ and the fourth grid C14). This stair-like part;; space;
By interposing the third grid, the auxiliary battery,
Position the fourth grid.

As a second factor, a schematic perspective view of the electrode member with a stepped portion is shown. Plane part c! 11 Ct of the three openings, (c), (to)
is drilled. There is a side wall portion Qω extending perpendicularly to this plane portion, and the side wall portion in the longitudinal direction is stepped (c). There is a flange part (5) at the other end of this side wall part,
This flange part has a support piece (
281 are installed in succession.

Before explaining the method of assembling an electron gun according to the present invention, a conventional method of assembling an electron gun will be explained. FIG. 3 is an exploded perspective view for illustrating a conventional method of assembling an electron gun. The base (51) I: of the assembly jig (500) has three reference pins (50, (50b), (50C) standing upright.

First, insert the fourth grid I into the reference bin, then insert the varnish base 4f (52), insert the third grid A4,
Insert the spacers in order C; the first
After applying appropriate pressure from the grid U side, the electric machine support rod (2), a part of which is heated and melted, is crimped.

After the electric machine support rod is cooled and solidified, remove it from the assembly jig and pull out the spacer to complete the assembly.

Incidentally, although not shown, the shade & support member and the stem support member are also melted at the same time and assembled by pressing them together.

A method for assembling the electron gun of the present invention will be explained below with reference to FIG. (Parts common to the conventional assembly method shown in FIG. 3) are omitted.

Assembly jig (500) i: Three upright reference bottles (
50a), 1 (50b), (508) C1 First, insert the 4th grid (L fathom).

Next (: Place the first spacer (81) in the shape of a horseshoe on the stepped part of the fourth grid I. Next, place the second spacer (82) in the shape of a horseshoe on top of the first spacer. The horseshoe-shaped spacer has a stepped portion (801), and this stepped portion (801) is set to align with a part of the oblong hole of the auxiliary electrode. One side is connected to the step part (82) of the horseshoe-shaped spacer (82).
01) and place the other auxiliary electrode (-) on top of it.Next, insert the second horseshoe-shaped base with a stepped part f.
(83) is placed so as to align with the opening s of the auxiliary electrode,
Place the first horseshoe spacer (84 mm) on top of it. Then
Insert so that the stepped portion of the third grid [31 and the horseshoe spacer are aligned.

The following is the same as in the conventional example (:, the spacer and the grid are inserted in this order, and after applying pressure, the electric machine support rod (21) which has been heated and melted is crimped. After being cooled and solidified, it is removed from the first assembly jig. Pull out the horseshoe-shaped spacers (81) and (84).After that (U second stepped horseshoe-shaped spacer N82).

(83) is pulled out, and the other spacers are also pulled out. In addition, the horseshoe-shaped spacer with one step 11 has a maximum thickness of 8
5) must be smaller than the distance between the stepped portions of the third and fourth grids and the auxiliary battery. This is because if the maximum thickness is greater than the above-mentioned interval, the stepped horseshoe-shaped spacer cannot be pulled out.

In addition, by aligning the semicircular part (86) of the horseshoe-shaped spacer with the short diameter side wall shape (23 m) of the third grid (13, fourth grid (14)), the auxiliary electrode Positioning on a surface parallel to the tube axis can be easily performed.The embodiment shown in Fig. 1 has been described for case C where the electrode support rod is integrated in the tube axis direction. However, the present invention is not limited to this, but as shown in Figure 4, the electrode support rod borders the auxiliary electrode.

Even if the structure is divided into two, the electrical & structural f-L of the present invention can be applied. Furthermore, it goes without saying that the electrode structure of the present invention can be applied even if the auxiliary electrode does not completely cover the gap between the third grid and the fourth grid but only partially covers it.

Furthermore, even if the first auxiliary commode of the present invention is one electrode member,
The present invention can be applied even when the electrode member is composed of two or more electrode members.

Further, the ball lens method is not limited to the pi-potential type, and the present invention #1 can also be used with a so-called compound type electron gun called the Kuzudora potential type.

In other words, the gap between the counter electrode that forms the king lens system of the compound electron gun is enlarged, and a step-like part is provided on the side wall of the counter electrode (thereby, the positioning of the auxiliary electrode and the opposing bridge is improved. Accuracy (accurate and easy to set)

In addition, in the example shown in Fig. 1, the opposing portions of the third and fourth grids are made of cap-shaped S material, but the opposing poles may include other members. For example, as shown in Figure 6 (Otori) (;
F-shaped electrodes and thick plate electrodes (133) and (143) may be arranged in the interrogation part of the grid [31 and the fourth grid (14)].

This thick plate battery F2 has the advantage of being able to obtain a large opening diameter while preserving the electron beam spacing (C8g) as shown in the figure.

Therefore, from the sixth factor (: using the embodiment shown), an electron gun with even better focusing performance can be realized.

〔Effect of the invention〕

As described above, according to the electron gun of the present invention, the electron gun C has a structure in which the gap between the counter electrode & is shielded by the auxiliary electrode 1;
The relative position of the counter electrode and the auxiliary electric machine can be set easily and with high precision.Therefore, an electron gun with high performance in which both the convergence characteristic and the focus characteristic are ≦2 is provided.Furthermore, the present invention This method can also be applied to a so-called composite type electron gun, and has a wide range of applications.Therefore, the industrial value of the electron gun according to the present invention is extremely large.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram showing an embodiment of a cathode ray sound electron gun to which the present invention is applied, Figure 2 is a schematic perspective view showing one of the electrodes in Figure 1, and Figure 3 is a conventional electron gun. FIG. 4 is an exploded perspective view for explaining the assembly of the electron gun of FIG. 1. FIG. 5 is a schematic configuration diagram showing another embodiment of the present invention. Figure 6 (+1) is further C of the present invention;
A schematic configuration diagram showing another embodiment, No. 61J (bl is a schematic perspective view showing one of the electric machines in FIG. 6(1). αQ...Cathode συ...First grid αS...・2nd grid α31-...3rd grid I...4th grid haze...Convergence cup west...electrode support piece Mountain...auxiliary power & agent
Patent Attorney Nori Keisuke Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) An electron gun for a cathode ray tube consisting of a triode section that emits at least one electron beam, and a main lens section that focuses the electron beam on a predetermined target, the main lens section being coaxial. In a cathode ray tube electron gun, the cathode ray tube electron gun is composed of at least one pair of opposing electrode groups disposed in the gap between the opposing electrodes, and an auxiliary electrode disposed so as to cover part or all of the gap between the opposing electrodes. 1. An electron gun for a cathode ray tube, comprising a cap-shaped electrode member having a bottom portion having a hole and a side wall portion connected to the bottom portion, the side wall portion being provided with a stepped portion. (2) The electron gun for a cathode ray tube according to claim 1, wherein the pair of opposing electrodes and the auxiliary electrode forming the main lens portion are assembled via a stepped portion of the cap-like member.