JPH01130451A - Electron beam generating device - Google Patents

Abstract

PURPOSE:To prevent vibration of a cathode electrode by using a back face plate, whereby a location restricting means supporting cathode is decided by a single spacer, as a reference surface, and thereby lessening unevenness on a location restricting plate in the thickness direction. CONSTITUTION:A concave electrode supporting means 44 and a back face electrode 34 are contacted directly by a spacer means 49, so that the shape accuracy of the electrode supporting means 44 is conducted directly to the back face electrode 34, which thus takes such a form as alongside the shape of electrode supporting means 44. Because arranged alongside this back face electrode 34, a cathode position restricting member 35 takes a shape tracing the contact surface of spacer means 49 of the back face electrode 34 as reference. As interposing a spacer, the cathode position restricting member 35 will have very good precision. Eventual unevenness of spacers will not influence at all, different from a conventional arrangement. Thereby vibration of cathode electrode can be prevented certainly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention particularly relates to an electron beam generator in which a cathode electrode is formed of a linear electrode.

2. Description of the Related Art This type of electron beam generator is considered to be used as an electron source in flat panel display devices such as television receivers and computer terminal displays. It is configured. A linear cathode electrode 1 is stretched with a predetermined tension applied between support members 2 and 3 arranged at intervals. A back electrode 4 and a flat electron beam extraction electrode 6 having a large number of small holes are disposed thereon. Its operation is to emit thermoelectrons from the linear cathode electrode 1 heated to a high temperature, and to generate an electron beam toward the front side F by applying a predetermined potential to the electron beam extraction electrode 6.

Problems to be Solved by the Invention In such a conventional configuration, when the distance S between the supporting members 2 and 3 is increased, the linear cathode electrode 1 can easily move the supporting members 2 and 3 to the fixed end with a small impact. As the string vibrates.

When the cathode electrode 1 vibrates in this way, the emission current fluctuates, and therefore, in the case of a display device for a television receiver, uneven brightness occurs and the quality of the image is degraded. Further, if the vibrated cathode electrode 1 contacts the back electrode 4 or the electron beam extraction electrode 5 and short-circuits, the cathode electrode 1 is disconnected.

Therefore, the cathode vibration prevention structure as shown in Fig. 5 and Fig.
In No. 422 we proposed. FIG. 5 is a sectional view of a conventionally proposed flat panel display device, and FIG. 6 is a vertical sectional view taken along line XX/ in FIG. 10 is a container, 11 is a phosphor, 12 is a cathode electrode, 13 is a back electrode, 14 is an electron beam extraction electrode, 15.16 is a control electrode, 17 is a horizontal deflection electrode, 18.19, 20.21 are insulating spacers , 22 is a holding member having a concave portion in the center, and 23 is a back plate. Reference numeral 24 denotes a position regulating member, which is in contact with the back of the cathode electrode 12.

With the above configuration, when the inside is evacuated, the members above the holding member 22 do not have the concave shape of the holding member. As shown in FIG. 6, the position regulating member 24 stretches the cathode electrode 12 in a curved shape. . When all of the cathode electrodes 12 come into contact with the position regulating member 24, they are strung at short pitches, making it difficult for them to vibrate, and the amplitude of the vibrations becomes extremely small, so that there is no problem in practical use.

However, if the spacers 18, 19, 20, 21 have uneven thickness in the V direction, the smooth convex curved shape toward the phosphor 11 will collapse, and the position regulating member 24 will no longer come into contact with the cathode electrode 12. .

Therefore, the position regulating member 2 in contact with the cathode electrode 12
4. If the distance between the electrodes is wide, cathode vibration is likely to occur, and the amplitude is also large, resulting in uneven brightness and electron beam extraction! Problems such as touching the poles arise. In order to suppress vibrations, it is difficult to suppress the spacer accuracy unless the spacer accuracy is considerably increased, and increasing the spacer accuracy is technically difficult and has practical problems such as a significant increase in cost.

Means for Solving the Problems The present invention solves the above problems, and includes at least one linear cathode, cathode position regulating means disposed behind the linear cathode, and cathode position regulating means. , an electron beam extraction electrode provided in front of the cathode, and an electrode support means disposed in front of the electron beam extraction electrode and concave in the longitudinal direction of the cathode; The back electrode is arranged along the electrode support means.

Effect According to the above configuration, since the concave electrode support means and the back electrode are in direct contact with each other through the spacer means, the shape accuracy of the electrode support means is directly transmitted to the back electrode, and the back electrode The shape follows the shape. Since the cathode position regulating member is disposed along the back electrode, the cathode position regulating member has a shape based on the contact surface of the spacer means of the back electrode. Therefore, in the conventional configuration, the cathode position regulating member is set through multiple spacers, which is affected by uneven thickness of the multiple spacers, but in the case of this groove configuration, the cathode position regulating member is set through a single spacer. Therefore, the accuracy of the cathode position regulating member is greatly improved. Further, unlike the conventional configuration, it is not affected by the uneven thickness of a plurality of spacers. Therefore, it is possible to reliably prevent vibration of the cathode electrode.

Example An embodiment of the present invention will be described using FIGS. 1 and 2.

FIG. 1 is a sectional view of a flat panel display device incorporating an electron beam generator, and FIG. 2 is a sectional view taken along the line Y--Y' in FIG. 30 is a face plate with a phosphor 3 on its inner surface.
1 is coated. 32 is a side wall, 33 is a back plate, 34 is a back electrode, and 35 is a regulating plate as a cathode position regulating means, the surface of which is coated with a heat-resistant insulating film, such as an alumina film. The regulating plate 35 is in close contact with the back electrode. 36
is a linear cathode, which is in contact with the regulating plate 35.

37 is a spring that applies tension to the cathode 36.

A pin 38 is inserted into a hole in the regulating plate 35. A spring 39 urges the regulating plate 35 in the longitudinal direction of the cathode 36. Reference numeral 40 denotes an electron beam extraction electrode having a small hole corresponding to the cathode 36.

41 is a control electrode, 42 and 43 are insulating spacers, and 44 is a support member as an electrode support means, which has a concave shape in the longitudinal direction of the cathode 36. Reference numeral 45 denotes a spring as an electrode pressing means, a control KW 41 , an electron beam extractor' radial condyle 40 . Further, the regulating plate 35 is pressed toward the back electrode 34 side. A plurality of deflection electrodes 4'6 are arranged approximately perpendicular to the face plate. 47 is a needle-like pin fixed to the deflection electrode.

48 is a container whose inside is evacuated. Therefore, atmospheric pressure is utilized in the container. 49 is a spacer made of an insulating material. The spacer 49 is divided and arranged in the longitudinal direction of the cathode 36. The spacer is in direct contact with the support member 44 and the back electrode 34. Arrow AB of spacer 49
The force direction dimensions are finished with high precision.

According to the above configuration, when atmospheric pressure acts on the container, the back plate 33. The back electrode 34 is pressed inside the container. On the other hand, the face plate 30 also tends to bend toward the inside of the container. However, the spacer 49° support member 44. Deflection electrode 4
6. It has a structure that receives atmospheric pressure with a pin 47, and the support member 4
Since 4 has a concave shape, the back electrode 34 is bent and held in a shape along the concave shape of the support member. The regulating plate 35 is pressed against the spacer abutting surface of the back electrode 34 by the spring 39 and the spring 45 for suppressing means. The cathode 36 is stretched along the surface of the regulating plate 360. With the above configuration, cathode 3
When 6 is heated, an electron beam 60 is ejected, 7M, and the child beam extraction electrode 40. It passes through the control electrode 41 and the phosphor 3
It collides with 1 and emits light. In addition, the regulation plate 36. The electron beam extraction electrode 40° and the control electrode have shapes as shown in FIG. 3, and a through hole 35a of the spacer 49 is also provided.

Effects of the Invention As described above, according to the present invention, since the position regulating means for supporting the cathode uses the back plate defined by one spacer as a reference plane, the irregularities in the thickness direction of the position regulating plate are extremely small. , a smooth curved surface is obtained and cathode vibration is extremely unlikely to occur. Furthermore, since cathode vibration is less likely to occur, it becomes possible to take out a stable electron beam, and when used in a display device, it is possible to achieve the excellent effect of obtaining good image quality with little brightness unevenness.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a flat panel display device incorporating an electron beam generator according to an embodiment of the present invention, FIG. 2 is a Y-Y' cross-sectional view of FIG. 1, and FIG. 3 is a perspective view of a regulating plate. , FIG. 4 is a longitudinal cross-sectional view of a conventional electron beam generator, FIG. 6 is a cross-sectional view of a flat panel display device of the prior application, and FIG. 6 is a cross-sectional view taken along line xx in FIG. 34...Back electrode, 36...Cathode position regulating means, 36...Cathode, 4o...
. . . Electron beam extraction electrode, 49 . . . Spacer means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 5

Claims (7)

[Claims] (1) At least one linear cathode, a cathode position regulating means provided behind the linear cathode, a back electrode provided behind the cathode position regulating means, and an electron electrode provided in front of the cathode. 1. An electron beam generating device comprising a beam extraction electrode and an electrode support means having a concave shape in the longitudinal direction of the cathode electrode, the back electrode being configured along the electrode support means. (2) The electron beam generating device according to claim 1, characterized in that spacer means is arranged between the back electrode and the electrode support means. (3) The electron beam generating device according to claim 1, wherein the spacer means is divided and arranged in the longitudinal direction of the cathode. (4) The electron beam generating device according to claim 2, wherein the electron beam extraction electrode and the cathode position regulating means are provided with a portion through which the spacer means passes. (5) The electron beam generator according to claim 1, wherein at least the cathode contact surface of the cathode position regulating means is made of an insulating material. (6) The electron beam generating device according to claim 1, further comprising pressing means for pressing the cathode position regulating means against the back electrode. (7) The electron beam generating device according to claim 1 or 6, further comprising a pressing means for pressing the electron beam extraction electrode toward the cathode position regulating means.