JPS62193041A - Picture tube - Google Patents

Abstract

PURPOSE:To reduce aberration and electric power consumption, by depositing a plurality of cylindrical electrodes on the inside surface of a tubular neck and providing a mesh electrode at the front end of the cylindrical electrodes to constitute a picture tube of the electrostatic focusing and electrostatic deflection type. CONSTITUTION:An electron gun comprising a cathode K and a first and a second grids G1, G2 is arranged in a tubular neck 1. A third, a fourth and fifth grids G3, G4, G5 are deposited on the inside surface of the tubular neck 1 to constitute an electrode system for focusing and deflection. An electrode G6' is deposited on the inside surface of the tubular neck 1 at the front end of the electrode system and connected to a mesh electrode G6 having a concave surface toward a phosphor screen 4. a picture tube of the electrostatic focusing and electrostatic deflection type is thus constituted. The diameter of an electrostatic lens is increased to reduce the aberration of the tube. The grid G4 is also used as a deflection electrode to shorten the length of the tube. As a result, the size and electric power consumption of the tube are reduced without deteriorating the properties thereof.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a picture tube.

[Summary of the invention]

In the present invention, the picture tube is constructed as an electrostatic focusing/electrostatic deflection type having mesh-like electrodes, thereby reducing power consumption and downsizing without deteriorating the characteristics.

[Conventional technology]

Conventionally, normal receiver tubes are formed as electrostatic focusing/electromagnetic deflection type. In this case, electrostatic focusing is performed by forming an electrostatic lens with a cylindrical metal electrode placed inside the neck, and electromagnetic deflection is performed by a deflection coil placed outside the neck.

[Problem that the invention seeks to solve]

In conventional picture tubes, a focusing electrostatic lens is formed using a cylindrical metal electrode, and since the aperture of the electrostatic lens is relatively small, it is difficult to reduce aberrations. Also,
Since electromagnetic deflection is performed by the deflection coil, power consumption is large, and this power consumption increases particularly when the phosphor surface potential is increased in order to increase brightness. Power consumption can be reduced by reducing the diameter of the neck portion, but this reduces the aperture of the electrostatic lens and increases aberrations.

In addition, an electrostatic focusing/electrostatic deflection type picture tube for oscilloscopes has been proposed, but since the electrostatic deflection is performed by parallel plates, the deflection aberration is large, and the electron beam After electrostatic focusing, the tube passes through a three-stage unit of horizontal deflection and vertical deflection, which increases the firepower of the tube.

In view of these points, the present invention aims at reducing power consumption and downsizing without deteriorating the characteristics.

[Means for solving problems]

The present invention is an electrostatic focusing/electrostatic deflection type picture tube. That is, it includes a first cylindrical electrode, a second cylindrical electrode, and a mesh-like electrode disposed in an electron beam path, and a first and a second cylindrical electrode.
The cylindrical electrode is attached to the inner surface of the tube body, the first and second cylindrical electrodes constitute a focusing electrode system that focuses the electron beam Bm, and the second cylindrical electrode deflects the electron beam Bm. be done. For example, electrodes 03 to G5 are arranged together with the first and second cylindrical electrodes, the electrodes G3 to G5 constitute a focusing electrode system, and the electrode G4 also serves as a deflection electrode. Then, the electron beam Bm density-modulated by the sandwich signal is supplied to the fluorescent surface (4) via the first cylindrical electrode, the second cylindrical electrode, and the mesh-like electrode, and the potential of the mesh-like electrode is The potential is lower than that of the preceding electrode.

[For production]

In the above configuration, since the first and second cylindrical electrodes constituting the focusing electrode system are formed by being attached to the inner surface of the tube,
When the neck diameter is the same as before, the aperture of the electrostatic lens becomes dog-shaped, reducing aberrations.

Further, since the second cylindrical electrode serves not only as a focusing electrode but also as a deflecting electrode, the tube length is relatively short or <fx>, thereby achieving miniaturization. Also, since it is electrostatically deflected, power consumption is reduced. Further, by arranging the mesh-like electrode, the high-voltage portion of the fluorescent surface and the first and second cylindrical electrode portions are separated.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In the figure, (1) is a neck tube, (2) is a funnel, and (3) is a face plate, each of which is made of glass. A fluorescent surface (4) whose inner side is covered with, for example, an aluminum film is formed on the inner surface of the face plate (3). Further, an internal conductive film (5) is coated on the inner surface of the funnel (2), and a high voltage H' from the anode terminal (6) is applied.
V (for example, 10 kV) is applied to the fluorescent surface (4) via this conductive film (5).

In addition, in the neck tube (1), K, G, ,
G2 is a cando electrode, a first grid electrode, and a second grid electrode, which constitute the electron gun, respectively. Maroku, G, , G4 and G5 are the third. The fourth and fifth grid electrodes and electrodes 03 to G5 constitute a focusing electrode system, and G4 also serves as a deflection electrode.

Further, G6 is a mesh-like electrode and is fixed to a mesh holder (7). And mesh holder (7)
For example, silver paste (
8) At this time, the mesh-like electrode G6
is connected to the electrode G6/. This mesh-like electrode G6 has a spherical shape with a convex surface on the fluorescent surface (4) side.

The electrodes G5 # G4 + G5 r G6/& are formed by depositing metal such as chromium on the inner surface of the neck tube (1), respectively.

That is, the electrodes 03 to G6< are formed as 1, for example, as shown in the developed view in FIG. To simplify the drawing, in FIG. 2, the parts to which metal is not deposited are shown with black edges. That is, the electrode G4 has a so-called arrow pattern in which four insulated and insulated electrode portions H+ + V+ + H- and - are alternately arranged. Further, TH+y Tv+, TH- and Tv- are leads from the electrode parts H+, ■+, L and V-, respectively, and the electrode G
Formed in the area of Electrode portions H+ +H- are electrode portions for horizontal deflection, while electrode portions v+ and ①- are electrode portions for vertical deflection. Although not shown, a predetermined voltage, for example O
A sawtooth wave voltage with a horizontal period that varies symmetrically around v is applied, while a predetermined voltage, for example Ov, is applied to the electrode parts V+ and V- via leads TV+ and TV'i, respectively. A sawtooth wave voltage with a vertical period that changes is applied, and horizontal and vertical deflection scanning is performed.

Further, in FIG. 1, v(9) is a conductive pin, and a neck pipe (IN711: hole α0 is formed) corresponding to the electrode G5.

The conductive pin (9) is inserted through this person αQ and connects to the electrode G5.
electrically connected to. Then, this conductive pin (9) is attached to the neck tube (1) with a frit α°C. Electrode G5
A predetermined voltage, e.g.
00v is applied.

Furthermore, a terminal (6) is led out from the mesh-like electrode G6. The mesh-like electrode G6vc is connected to a predetermined voltage lower than the voltage applied to the electrode G5 via the terminal (6), for example, 27
0v is applied.

Although not mentioned above, the electrode G3 has, for example, 30
0v is applied.

In addition, the fluorescent surface (4
With the tip of the ) side deeply recessed into the funnel (2) by a predetermined length, it is sealed with the frit ( ) (11).

In the above configuration, the electron beam Bm, which is intensity-modulated by the video signal from the cathode K, is focused by the electrostatic lens formed by the electrodes 03 to G5 and sent to the fluorescent surface (4).
At the same time, this electron beam Bm is deflected horizontally and vertically by the electrode 04 to scan the fluorescent surface (4). Therefore, an image based on the video signal is displayed on the fluorescent surface (4).

According to this example, since the electrodes 03 to G5 are formed by being adhered to the inner surface of the neck tube (1), when the diameter of the neck tube (1) is the same as the conventional one, the aperture of the electrostatic lens is the same as that of the conventional one. , aberrations are reduced. Further, according to this example, since the electrode G4 serves not only as a focusing electrode but also as a deflecting electrode, the length of the tube is relatively short and miniaturization can be achieved. Also, according to this example,
Since it is electrostatically deflected, power consumption can be reduced. Further, according to this example, since the mesh-like electrode 06 is disposed between the electrodes G3 to G5 and the fluorescent surface (4), the high voltage part of the fluorescent surface (4) and the deflection of the electrodes 03 to G5 are Parts of the focusing system can be separated. Therefore, the high voltage applied to the fluorescent surface (4) can be increased without increasing the power consumption of the focusing/deflecting system, making it easy to increase the brightness. By the way, when the electron beam Bm hits the mesh-like electrode G6, secondary electrons are generated, but when they land on the fluorescent surface (4), there is a problem in that the secondary electrons cause halation.

However, according to this example, the potential of the electrode G5 is set higher than the potential of the mesh-like electrode G6, so the secondary electrons generated at the mesh-like electrode G6 are absorbed by the electrode G5 side, and the fraying caused by the secondary electrons is No problems arise.

Further, according to this example, in the vicinity of the mesh-like electrode G6,
Equipotential lines are formed by the shape of the electrode, that is, the shape similar to the spherical shape. The electron beam Bm connects the mesh electrode G6 and the fluorescent surface (4
), it travels approximately in the direction of the electric field.

Therefore, regardless of the angle at which the electron beam Bm is incident on the mesh-like electrode G4, the mesh-like electrode G6
From there, the light spreads to the fluorescent surface at a predetermined angle and progresses, and at this time, an enlarging effect occurs. Therefore, according to this example,
There is no need to worry too much about the deflection angle in the deflection and focusing system, and it is possible to design with emphasis on performance such as aberrations and deflection sensitivity of 0N.

In the above embodiment, a unipotential type having electrodes 03 to G5 is shown, but a pipotential type having no electrode G can be considered in the same way.

〔Effect of the invention〕

According to the present invention described above, the first
Since the second cylindrical electrode is attached to the inner surface of the tube body and formed into a Tee shape, the aperture of the electrostatic lens can be made into a canine shape, and aberrations are reduced. Further, since the second cylindrical electrode serves not only as a focusing electrode but also as a deflecting electrode, the length of the tube can be made relatively short, and size reduction can be achieved. Moreover, since it is electrostatically deflected, power consumption can be reduced.

In addition, by arranging mesh-like electrodes, the high voltage part of the fluorescent surface and the first and second cylindrical electrodes can be separated, and for example, the high voltage can be increased without increasing the power consumption of the focusing/deflecting system. , high brightness can be easily achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a developed view of the electrodes. (1) is the neck tube, (2) is the funnel, and (3) is the face plate.

Claims (1)

[Claims] A first cylindrical electrode, a second cylindrical electrode, and a second cylindrical electrode arranged along the electron beam path.
The first and second cylindrical electrodes are attached to the inner surface of the tube, and the first and second cylindrical electrodes are attached to the inner surface of the tube.
The cylindrical electrode constitutes a focusing electrode system that focuses the electron beam, the second cylindrical electrode serves as a deflection electrode that deflects the electron beam, and the electron beam density-modulated by the video signal is directed to the second cylindrical electrode. A picture tube characterized in that the electric potential of the mesh electrode is lower than that of the preceding electrode, and the electric potential of the mesh electrode is lower than that of the preceding electrode.