JPH0815059B2 - Electrode structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrode assembly for controlling a charged beam such as an electron beam or an ion beam.

2. Description of the Related Art In recent years, flat panel image display devices have been actively developed, and liquid crystal displays (LCDs), electroluminescence displays (ELs), light emitting diode displays (LEs).
D) etc. have appeared on the market, but they are inferior to color brown in terms of brightness, resolution and full color. Flat-panel TVs have solved these problems, and development is progressing to a level that is comparable to cathode ray tubes in terms of image quality and full color.

The structure of this type of flat panel television will be described with reference to FIG. This flat panel TV uses thermionic emission, and controls the electron emission of the linear cathode 32 sequentially from the top to the bottom of the screen by the vertical scanning electrode 31 which is horizontally divided into half the number of scanning lines. By doing so, vertical deflection is performed. The emitted electron beam is the first grid 33,
Second grid 34, third grid 35 (abbreviated below to G
1, G2, G3) and the fourth grid 36 (hereinafter,
After passing through G4), the beam is horizontally swung by the horizontal deflecting electrode 37 and collides with the anode 38 provided with the phosphors coated on R, G, and B in a stripe shape to emit a desired color.
The interlacing is performed by the vertical deflection electrode 39.

Problems to be Solved by the Invention FIG. 4 shows an electron gun unit. A support structure 41 is brought into contact with the linear cathode 40 in order to suppress vibration due to electrostatic force. The support structure 41 is made of ceramic and has a frit.
It is adhered to the vertical scanning electrode 43 by 42.

Since the supporting structure 41 as the vibration preventing means is provided between the vertical scanning electrodes 43 at the same pitch as the vertical scanning electrodes 43, for example,
In the case of 40 inches, about 600 linear cathodes are required. Therefore, there is a problem that the structure of the electron gun becomes complicated and the manufacturing process becomes complicated accordingly.

Means for Solving Problems A metal structure whose surface is coated with an insulator is used as a support structure which is a vibration preventing means.

Action With the above-described configuration, the support structure can be a vibration preventing means for the linear cathode, and at the same time, can control the electron beam by applying a voltage.

Example Hereinafter, an electrode structure according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the vicinity of an electron source in the embodiment of the present invention. Support structure 1 is 42-6 alloy, SUS3
A metal plate such as 04 is etched and its surface is coated with a ceramic such as alumina or an insulator such as SiO ₂ . In this embodiment, the support structure 1 is in contact with the linear cathode 2 at a pitch of 1 mm, and in order to reduce the power loss due to heat conduction, the contact point of the support structure was half-etched so that the contact width was 30 μm. Support structure 1
Is electrically divided in a direction perpendicular to the linear cathode 2 and is applied with a potential V ₁ so as to emit electrons only for a time corresponding to one horizontal deflection, and sequentially switches from the top to the bottom of the screen.

As described above, in this embodiment, the structure for supporting the linear cathode 2 is covered with an insulating material on the metal surface, and a voltage is applied, so that a single component can serve as both a support means and a control means.

FIG. 2 shows a perspective view of the vicinity of an electron source which is another embodiment. Similar to the first embodiment, the support structure 21 is made by covering a metal with an insulator, and each of them is divided. A sawtooth wave as shown by V + and V- is applied to the support structure 21 to deflect the electron beam emitted from the linear cathode 22 in the vertical direction of the screen. The same effect can be obtained when the applied voltage is a step wave or a triangular wave. In this embodiment, the same effect can be obtained not only for switching the electron beam but also for deflecting it. The same effect can be obtained by modulating the electron beam.

Effects of the Invention Using a metal covered with an insulator as a support structure,
By applying the voltage, the supporting means, the insulating means, and the like can serve as the electron beam control means at the same time, and the number of parts and the number of steps can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an electrode structure according to an embodiment of the present invention, FIG. 2 is a perspective view showing a main part of an electrode structure according to the second embodiment, and FIG. FIG. 4 is a perspective view showing the structure, and FIG. 4 is a perspective view near the conventional electron source. 1, 21 …… Support structure 2, 22 …… Linear cathode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Hamada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kinzo Nonomura, 1006 Kadoma, Kadoma City Osaka Prefecture

Claims (2)

[Claims] 1. A charged beam apparatus comprising a charged beam emission source and an electrode group for controlling or accelerating the charged beam emitted from the charged beam emission source, wherein a part of the electrode is used as a support structure serving as vibration preventing means. Alternatively, the electrode structure is characterized by using the one covered with an insulating film. 2. The electrode assembly according to claim 1, wherein an electrode, a part or all of which is covered with an insulating film, is arranged before and after the charged beam emission source.