JPH02270252A - Electron source - Google Patents

Abstract

PURPOSE:To promptly attenuate and prevent vibration applied to a linear cathode and cut down the number of parts and processes by winding a fine wire made of metal or insulator on the linear cathode in a helical manner. CONSTITUTION:A fine wire 2 made of metal or insulator is wound on a linear cathode 1 in a helical manner at least half of a turn. Accordingly, if electrostatic force works on the linear cathode 1 by a vertical scan electrode 3, the linear cathode itself or signal voltage applied to electrodes group 4 to produce resonance, the energy of vibration is abruptly attenuated by friction in a space to the fine wire 2 to prevent the vibration of the linear cathode 1. It is thus possible to simplify the structure of an electron gun and cut down manufacturing processes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electron source using a linear cathode, which is used in flat panel televisions, fluorescent display tubes, and the like.

2. Description of the Related Art In recent years, flat panel image display devices have been actively developed, including liquid crystal displays (LCDo), electroluminescent displays (EL), and light emitting diode displays (
LED), etc. have appeared on the market, but they are inferior to color brown in terms of brightness, resolution, and full color. Flat-panel televisions have solved these problems, and development has progressed to the point where they rival cathode ray tubes in terms of picture quality and full color.

The structure of this type of flat panel television will be explained with reference to FIG. This flat-panel television uses thermionic radiation, and sequentially controls the electron emission of a linear cathode 42 from the top to the bottom of the screen by vertical scanning electrodes 41 separated horizontally by half the number of scanning lines. Perform vertical deflection by The emitted electron beam is extracted by a first grid 43, a second grid 44, and a third grid 45 (hereinafter abbreviated as CL, G2, and G3), and passes through a fourth grid 46 (hereinafter referred to as G4). A beam is taken in the horizontal direction by the horizontal deflection electrode 47,
On the 4th day, the anode provided with phosphors coated in stripes of R, G, and H collides with each other to emit the desired color. Also, interlacing is performed by vertical deflection electrodes 49.

Problems to be Solved by the Invention FIG. 5 shows the electron gun section. A support structure 51 is brought into contact with the linear cathode 50 in order to suppress vibrations caused by electrostatic force. The support structure 51 is made of ceramic and is bonded to the vertical scanning electrode 53 through a frit 52 .

The support structure 51, which is a vibration prevention means, has a vertical scanning electrode 53.
For example, in the case of 40 inches, approximately 6
You will need 00 pieces. Therefore, the structure of the electron gun becomes complicated, and the manufacturing process also becomes complicated.

The present invention aims to solve the problems of the prior art.

Means for Solving the Problem A thin wire made of metal or an insulator is wound around a linear cathode.

Effect: According to the above configuration, when the linear cathode receives an electrostatic force and starts to vibrate, the vibration energy is attenuated by the friction of the rope with the thin wire that is wound, thereby preventing the linear cathode from vibrating. can do.

Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1(a) is a perspective view of an electron source in one embodiment of the present invention. A thin wire 2 is wound approximately spirally around the linear cathode 1. In this example, the linear cathode L is made of tungsten wire (Ba,
The thin wire 2 is a tungsten wire coated with Ca, Sr) O to a thickness of 7 to 8 μm, and has a diameter of about 5 μm. When the configuration shown in this embodiment is adopted, the vertical scanning electrode 3, the linear cathode 1 itself, or the electrode group 4
When an electrostatic force acts on the linear cathode 1 due to a signal voltage applied to the linear cathode 1, and the linear cathode 1 attempts to resonate, the vibration energy is rapidly attenuated due to the friction between the linear cathode 1 and the thin wire 2, and no vibration occurs. The thin wire 2 can be fixed to the spring 5 together with the linear cathode 1 as shown in FIG. The same effect can be obtained even if the thin wire 2 is provided and fixed, or even if the thin wire 2 is made into a free end.

As described above, in this embodiment, by spirally winding the thin wire 2 around the linear cathode l at least half a turn,
Vibration of the linear cathode 1 can be prevented.

FIG. 2 shows a side view of another embodiment near the electron source. Two thin wires 228.22 at both ends of the linear cathode 21
b is spirally wound, and no thin wire is wound around the center of the linear cathode 21. In this configuration, the linear cathode 2
This embodiment can be applied to cases where uniformity of the emission current emitted from the first embodiment is required, and provides the same effect as the first embodiment. Moreover, it goes without saying that the same effect can be obtained even when one end is used instead of both ends. Further, as shown in FIG. 3, a core wire 31 with a winding 32 spirally wound thereon is used as a heater, an electron emitting material is attached around the winding 32 as a linear cathode, and a thin wire 33 is wound around the heater. It also has a similar effect to prevent photography.

The present invention is more effective when the thin wire has the same diameter or less as the linear cathode. A combination of thin wire and linear cathode may also be used. In this example, the case where the linear cathode is an oxide is shown, but any linear cathode such as LaBe that causes thermionic emission can have the same effect, and a linear cathode can also be used as a thin wire. Needless to say, it has the same effect.

Effects of the Invention The present invention can quickly attenuate and prevent vibrations applied to the linear cathode by spirally wrapping a thin wire made of metal or an insulator around the linear cathode, and reduce the number of parts and man-hours. can.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an electron source in one embodiment of the invention, FIG. 2 is a side view of an electron source in another embodiment of the invention, and FIG. 3 is a different type of electron source in another embodiment of the invention. 4 is a perspective view showing the structure of a conventional flat panel display device, and FIG. 5 is a perspective view of a conventional electron source. l, 21... linear cathode, 2. 22-, 22b
. 33... thin wire, 5... spring, 6... pedestal, 31...
... Core wire, 32... Winding wire. Name of agent: Patent attorney Shigetaka Awano
(α)

Claims (2)

[Claims] (1) An electron source using a linear cathode, characterized in that a thin wire made of a metal or an insulator is spirally wound around the linear cathode at least half a turn or more. (2) The electron source according to claim 1, wherein the linear cathode has a heater wire formed by spirally winding a linear core wire, and an electron emitting material attached around the heater wire. .