JPS63119138A - Electron beam generating device - Google Patents

Abstract

PURPOSE:To prevent the unnecessary vibration of a cathode, by furnishing an electron beam pickup electrode in front of a linear cathode, arranging positioning members attached to the back of the cathode at specific intervals in the longitudinal direction of the cathode, and extending the cathode projecting more at its central part. CONSTITUTION:One sides of positioning rods 7 of quartz glass are held by a member 8. The diameter of the central rod 71 of the rods 7 is the largest, and the closer to the ends of a cathode 1, the smaller are the diameters of the rods. The height of the cathode 1 is regulated by members 9 which are installed at the ends of a beam pickup electrode 5 at the side opposite to a rear side electrode 4. In such a composition, all the positioning members 7 are connected to the cathode 1 securely when the assembly is completed, the vibration of the cathode is rarely produced, a break of wire of electrodes is prevented, the reliability is improved, and moreover, the uneven brightness in case of a flat display device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The field of industrial application relates to electron beam generators, particularly those in which the cathode electrode is formed of a linear electrode.

BACKGROUND OF THE INVENTION This type of electron beam generator is considered to be used as an electron source for flat panel display devices such as television receivers and terminal displays of electronic scale machines.
Conventionally, the configuration is as shown in FIG. 4. The linear cathode electrode 1 has supporting parts 4Δ2, 3 arranged at intervals.
It is stretched by applying a predetermined tension in contact with the horn sword electrode 1, and a back electrode 4 and a number of small holes are bored at predetermined intervals on both sides of the horn sword electrode 1. A beam extraction electrode 5 is provided.The operation thereof is to emit thermoelectrons from the linear cathode electrode 1 heated to a high temperature, and to set a predetermined potential to the electron beam extraction electrode 5. , which generates an electron beam towards the front side. 2
When the interval S between the two electrodes is increased, the linear) J sword electrode 1
When only a small impact is applied, the supporting parts 2 and 3 vibrate chordally with the fixed ends. When the cathode electrode 1 vibrates in this way, one mission current fluctuates, and therefore, in the case of a display device for a preview receiver, brightness unevenness occurs to avoid deterioration of image quality. Further, if the vibrated cathode electrode 1 contacts the back electrode 4 or the electron beam extraction electrode 5 and short-circuits, the J-sode electrode 1 will be disconnected.

Therefore, as shown in FIG. 5, protrusions 61 to 63 made of an insulating material are provided from the side of the back electrode 4 to the side of the cathode electrode 1, and each protrusion 61 to 63 is brought into contact with the cathode electrode 1 to form the above-mentioned string. Although it is possible to suppress and cover vibrations, each protrusion 61
The height from the back electrode 4 of ~63 ρ1. ρ2. It is difficult to align ρ3 uniformly, and the higher two of the protrusions 61 to 63
At present, it often comes into contact with the cathode electrode 1 only at certain points, and its function as a member for suppressing vibrations is not sufficient.

This defense is based on the unnecessary vibration of the linear cathode electrode 1 -L5)
The purpose of this study is to provide an electron beam device that can suppress

In order to solve the problem 1J, the electron beam beam lock of this one-stage defense has an electron beam extraction electrode arranged in the front part of the linear cathode electrode, and
A plurality of position regulating parts 4A are provided at predetermined intervals in the longitudinal direction of the cathode electrode, and the position regulating members 4A are arranged at predetermined intervals in the longitudinal direction of the cathode electrode. It is characterized by being stretched by extrusion.

Function In this structure, the cathode electrode is stretched so as to protrude forward toward the center by the position regulating member, so that the cathode electrode is stretched at both ends of the center of the cathode.
The cathode electrode Cl gradually retreats and is stretched in a state where it is pushed by the position regulating member 4, and the position regulating member 4
All of A is in contact with the cathode electrode.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 to 3. It should be noted that the same functions as those shown in FIG. 4 are marked with the same symbols and the explanation thereof will be omitted.

In Figure 1, 71, 72, 73, 74.

Reference numeral 75 denotes a position regulating member whose tip abuts against the back of the cathode electrode 1, and is made of quartz glass, and its base is shown in FIGS. 2 and 3. It is said to be @-made. The diameters φ1 to φ5 of the position regulating members 4471 to 75 are the largest in the diameter φ1 of the central position regulating member 71, and gradually become smaller as they approach the end of the cathode electrode 1, such as φ1>φ2>φ3. φ1>φ4>φ5. Reference numerals 91 and 92 denote cathode height regulating members, which are attached to the end of the electron beam extraction electrode 5 on the side facing the back electrode 4, and are made of quartz glass. Place the back electrode 4, electron beam extraction electrode 5, and holding member 8 in the predetermined positions.
1 to 75 are located between the horn sword height regulating members 91 and 92 as shown in Figs. 5 side, and the position regulating member 71
By the cathode electrode 1 moving backward from the rear electrode 4 toward the cathode height position regulating portion 4A91,
Since the tips of the position regulating members 74, 75 are elastically shaped like J in FIG.

Note that the position regulating member 7 near the cathode high regulating member 91
The position regulating member 71゜74J is larger in the bullet bamboo deformation hanging in No. 5, but since the diameter of No. 6 is set to φ5 < φ4 ~ φ1, a large force is applied to the saw blade pole 1. Never. The position regulating members 72.7 between the position regulating member 71 and the cathode height regulating member 92 are also similar to the above, and all the position regulating members 71 to 75 are securely in contact with the cathode electrode 1. Zuru 3゜This J, the sea urchin cathode electrode 1 is towards the front towards the center.
Because it is extruded and stretched, each (1/mounting regulating member 71''-75
The distances d1 to d5 between the contact positions a1 to a5 of the cathode electrode 1 and the electronic peel electrode 5 are such that dl<d
2<d3. dt < d4 < d5.

Note 1. In the above embodiment, the position regulating members 71 to 75 and the cathode height regulating members 91 and 92 are made of quartz glass, but any material having low thermal conductivity may be used.

In the above embodiment, the position regulating members 71 to 75 have a circular cross-sectional shape, but the same may be applied to a polygonal or annular cross-sectional shape.

Effects of the Invention As described above, in the present invention, each position regulating member provided at a predetermined interval in the longitudinal direction of the cathode electrode is pushed out and stretched so that the central part protrudes forward and covers the cathode electrode.
All the position regulating members reliably contact the cathode electrode, and each contact position becomes a node of vibration of the cathode electrode, increasing the frequency of vibration! 7? Since the amplitude is smaller, the vibration of the cathode is reduced compared to conventional ones, and the vibration is reduced in a short time, and the risk of disconnection of the cathode is greatly reduced, improving reliability. When used in a type display device, A3 reduces brightness unevenness and greatly improves image quality.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the electron beam R11 in the light beam, Fig. 2 is a view taken along the line x-x' in Fig. -Y' line, FIG. 4 is a sectional view showing the basic structure of a conventional electron beam generator, and FIG. 5 is a sectional view of a conventional example in which a part of FIG. 4 is improved. DESCRIPTION OF SYMBOLS 1... Cathode electrode, 4... Back electrode, 5... Electron beam extraction electrode, 71-75... Position regulating member, 8... Holding part shrine, 9t, 92... Cathode height Regulation part shrines, a1 to a5... contact positions between each position regulation member and the cathode electrode, d1 to d5... contact positions a1 to a5
Distance from the electron beam extraction electrode.

Claims (1)

[Claims] 1. An electron beam extraction electrode is disposed in front of a linear cathode electrode, and a plurality of position regulating members abutting on the back of the cathode electrode are disposed at predetermined intervals in the longitudinal direction of the cathode electrode. An electron beam generating device in which the cathode electrode is stretched by pushing out the cathode electrode toward the front side using the position regulating member. 2. Electron beam generation according to claim 1, characterized in that each position regulating member is supported in a cantilever structure, and the diameter thereof is gradually decreased from the center in the longitudinal direction of the cathode electrode toward the ends thereof. Device. 3. The electron beam generator according to claim 1, wherein the position regulating member is made of quartz glass.