JPH0574390A - Electron beam generating device - Google Patents

Abstract

PURPOSE:To perform a display at an uniform luminance by holding a linear cathode and vibration inhibit line laid with a space at the same potential. CONSTITUTION:A high resistance conductive film 2 is provided on the inside of a display surface 1 of soda glass or the like. Spring metal pieces 5 are delivered from the support electrodes 4a, 4b of a linear cathode 3 and connected to the conductive film 2. Thus, a vibration inhibit line 6 can be regularly held at the same potential as the linear cathode just under. The linear cathode 3 never make contact with the vibration inhibit line even if heated to a high temperature, causing no temperature reduction by conduction. Further, the vibration inhibit line 6 has the same potential as the linear cathode just therebetween, never causing a turbulence of electric field. Consequently, no luminance unevenness in display is caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam generator for a fluorescent display used for computer terminal displays, OA terminal displays and the like.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are a perspective view and an enlarged view of a main part of an electron beam generator used in a conventional fluorescent display device. A phosphor 8 is patterned on the anode substrate 7, a grid 9 is fixed on the anode 8 by a conductive paste 10, and a linear cathode 3 is formed on the grid 9 and electrodes 4a, 4 are provided thereon.
The vibration suppression wire 6 is stretched by b and is fixed so as to contact the linear cathode 3 in a direction intersecting the direction in which the linear cathode 3 is stretched. This vibration suppression line 6 has a display disorder,
This is intended to prevent vibration of the linear cathode 3 which causes flicker and the like. Here, the linear cathode 3 has a structure in which an oxide electron emitting material is applied to the surface of a tungsten wire, and the vibration suppressing line 6 has a wire diameter larger than that of the tungsten wire of the linear cathode 3. Was there.

[0003]

As shown in FIG. 5, the vibration suppressing wire 6 and the linear cathode 3 are in contact with each other, or
There was a positional relationship with a gap. In FIG. 5, the linear cathode 3 and the vibration suppressing line 6 are in contact with each other. In this state, in order to extract the electron beam, the linear cathode 3 is heated to a high temperature. At this time, since the linear cathode 3 and the vibration suppressing wire 6 are in contact with each other, heat is largely transferred from the linear cathode 3 to the vibration suppressing wire 6, and the temperature of the linear cathode 3 at the contact portion becomes lower than that of the surroundings. The electron emission capability of the linear cathode 3 at this contact portion was locally reduced, and as a result, the amount of emitted electrons was uneven, resulting in uneven brightness on the display.

When the linear cathode 3 and the vibration suppressing wire 6 are not in contact with each other (not shown), a potential is generated in the vibration suppressing wire 6 and the electric field near the vibration suppressing wire 6 is disturbed, so that the linear cathode The electrons radiated from No. 3 were disturbed, and the display was uneven.

[0005]

According to the present invention, the vibration suppressing line for suppressing the vibration of the linear cathode is configured to have the same electric potential as that of the linear cathode positioned immediately below the vibration suppressing line. Further, in the present invention, the diameter of the vibration suppressing wire is made smaller than the diameter of the tungsten wire used for the linear cathode.

[0006]

The present invention will be described below with reference to the drawings. 1 and 2 are a sectional view and an enlarged view of a main part of a first embodiment of the present invention. A high resistance conductive film 2 is formed inside a display surface glass 1 made of soda glass or the like. A metal piece 5 having a spring property is led out from the electrodes 4a and 4b supporting the linear cathode 3 and connected to the conductive film 2 formed on the display surface glass 1. Further, from the electrode 4c supporting the vibration suppressing wire 6 for suppressing the vibration of the linear cathode 3 to the metal piece 5
Are connected to the conductive film 2.

As a result, as shown in FIG. 2, even if the vibration suppressing line 6 and the linear cathode 3 are separated from each other, the metal piece 5 is connected to the conductive film 2 formed on the display glass 1 with high resistance. Therefore, the vibration suppression line 6 having the metal piece 5 is
It is always kept at the same potential as the potential of the linear cathode just below the vibration suppression line. Therefore, even if the linear cathode 3 is heated to a high temperature, the linear cathode 3 and the vibration suppressing wire 6 are not in contact with each other, so that the temperature does not decrease due to conduction. further,
The vibration suppressing line 6 has no electric field disturbance due to the electric potential and electric potential of the linear cathode immediately below the vibration suppressing line 6. As a result, uneven display brightness does not occur.

FIG. 3 is a sectional view of the second embodiment of the present invention. In this embodiment, the vibration suppressing wire 6 is in contact with the linear cathode 3, but the diameter of the vibration suppressing wire 6 is smaller than the diameter of the tungsten wire used for the linear cathode 3. It is intended to reduce heat conduction from the linear cathode 3 to the vibration suppressing wire 6. As a result, since the temperature drop of the linear cathode 3 is small, the electron emission capability is maintained and display unevenness does not occur.

In the first embodiment of the present invention, the vibration suppressing line is formed by connecting the metal pieces attached to the electrodes supporting the linear cathode and the vibration suppressing line to the conductive film formed on the display surface glass. Although the cathode potential is applied to the electrode, the same effect can be obtained by connecting the electrode C to which the vibration suppressing line is connected and the electrodes a and b to which the linear cathode is connected via a resistor outside the panel. Needless to say.

[0010]

As described above, according to the present invention, it is possible to realize the heat insulation between the linear cathode and the vibration suppressing line, and further to prevent the disturbance of the electric field due to the vibration suppressing line. As a result, it is possible to prevent the local electron emission capability from being reduced due to the heat escape of the linear cathode, and to prevent the electric field from being disturbed due to the potential of the vibration suppressing line, thereby realizing a display with uniform brightness.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 3 is an enlarged view of a main part of the second embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional example.

5 is an enlarged view of a main part of the conventional example shown in FIG.

[Explanation of symbols]

 1 Display Surface Glass 2 Conductive Film 3 Linear Cathode 4a, 4b, 4c Electrode 5 Metal Piece 6 Vibration Suppression Line 7 Anode Substrate 8 Phosphor 9 Grid 10 Conductive Paste

Claims (2)

[Claims] 1. An electron beam generator having a plurality of linear cathodes stretched at intervals and a vibration suppressing line for suppressing the vibration of the linear cathode, wherein the potential of the vibration suppressing line is suppressed. An electron beam generator characterized in that it is held at the same potential as the potential of the linear cathode immediately below the line. 2. The electron beam generator according to claim 1, wherein the diameter of the vibration suppressing wire is smaller than the diameter of the tungsten wire used for the linear cathode.