JPH04322043A - Flat type cathode-ray tube - Google Patents

Abstract

PURPOSE:To restrain deficient operation due to contact between electrode plates or the like caused by vibration of the electrode plates by applying tension to the electrode plates when the electrode plates are erected right with respect to the direction of a screen in a flat type cathode-ray tube provided with electrodes. CONSTITUTION:In forming an electrode serving as an electron beam controller, a frame 18 having four sides is maintained flexible previously with application of external force. In this state, ribbon-like electrode plates 16 are alternately supported on struts 23 disposed in the frame 18. Upon completion of supporting work of the electrode plates 16 on the struts 23, the force applied onto the frame 18 is released to be brought into an original state, thus constituting the electrode plates 16 with tension.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cathode ray tube used, for example, in a color picture tube.

0002

2. Description of the Related Art FIG. 9 is a block diagram of a conventional flat-plate cathode ray tube.
It consists of 2. 1 is a cathode section, 2 is an electron beam extraction means, and an electron beam control means 3, which are connected to the storage container 3.
It is located within 0. A phosphor layer 5 is formed on the inner surface of the screen glass 4. Note that 12 is a getter container, which is supported by the back glass portion 32 via a getter holder 13.

In the conventional flat-plate cathode ray tube having the above structure, a predetermined voltage is applied to the cathode portion 1, and a predetermined potential is applied to the electron beam extracting means 2 to extract the electron beam. The extracted electron beam is transmitted to the electron beam control means 3.
The direction of the phosphor layer 5 on the screen glass 4 is controlled by
The image is reproduced by accurately hitting the target.

By the way, as shown in FIG. 10, the electrode which is the electron beam control means 3 of the conventional flat-plate cathode ray tube as described above is made by forming an electrode plate 16 with a large number of holes 16a into slits in a horizontal plane. Such electrode plates 16 are arranged in parallel as shown in FIG.
As shown in FIG. 1, the structure is arranged parallel to the screen direction (hereinafter referred to as the z direction).

[0005]

[Problems to be Solved by the Invention] Since the conventional flat-plate cathode ray tube is constructed as described above, in order to increase the screen resolution, it is necessary to reduce the plate width W of each electrode plate 16 arranged in parallel. Therefore, the mechanical strength of each electrode plate 16 tends to decrease. Furthermore, when increasing the aperture ratio to improve brightness, it is necessary to increase the hole diameter d of each electrode plate 16, which also causes the mechanical strength of the electrode plate 16 to decrease.

Therefore, the inventors of the present invention created holes 1 in the electrode plate 16.
By arranging the electrode plate 16 perpendicular to the z direction without opening the electrode plate 6a, the resolution can be increased without reducing the width of the electrode plate 16, and the electrode plate 16 can be fixed to a frame (not shown). This was previously proposed in order to increase the mechanical strength of each electrode plate 16.

However, simply fixing the electrode plate 16 to the frame does not stop the electrode plate 16 from shaking, and contact between adjacent electrode plates due to the shaking of the electrode plate 16 may cause the electrode to become unstable. I couldn't expect it to work properly.

The present invention was made to solve the above-mentioned problems, and it is a flat cathode ray that not only has sufficient mechanical strength of the electrode plate but also enables stable operation. The purpose is to provide a tube.

[0009]

[Means for Solving the Problems] A flat cathode ray tube according to the present invention is provided with a flat cathode ray tube that is fixed to a pre-deflected frame when the direction of the slit-shaped electrode plate serving as the electron beam control means is perpendicular to the screen direction. It is characterized by stretching a ribbon-shaped electrode plate and applying tension to the electrode plate by the return of the deflection of the frame.

[0010] Furthermore, even if the material of the ribbon-shaped electrode plate has insulating properties and a conductive film is formed in advance to match the length to be used before it is pasted on the frame, or after it is pasted on the frame, A sexual membrane may be formed.

[0011]

According to the flat cathode ray tube of the present invention, the aperture ratio is increased even if the pitch between the electrode plates is the same as in the prior art, so the brightness is significantly improved. Furthermore, since the electrode plates do not come into contact with each other, the flat cathode ray tube can be used either vertically or horizontally, allowing for a wider range of usage conditions.

[0012] Furthermore, since a conductive film is formed in advance to match the length of the insulating electrode plate, the insulation of the electrode plate can be maintained by hanging the insulating part on the support. Can be done.

[0013]

[Embodiments] Examples of the present invention will be described below. FIG. 1 shows a block diagram of a flat cathode ray tube according to an embodiment of the present invention. In the figure, 1 to 5 and 12 and 13 are the same as those of the conventional flat cathode ray tube shown in FIG. are given the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 1, reference numeral 26 denotes a storage container, which consists of a front metal part 6 and a back metal part 7. The screen glass 4 is bonded to the front metal part 6 of the storage container 26, and the completed cathode part 1 and electron beam extraction means 2 are bonded to the rear metal part 7, respectively. Reference numeral 9 denotes an electrode group, which is formed by integrating a plurality of electrodes, which are the electron beam control means 3, through an insulator in advance. stud pin 11
It is said to be removable. The phosphor layer 5 is formed on the screen glass 4 by an exposure method using the electrode group 9 integrated in this way. Note that, in terms of operating principle, the electrode group 9 needs to be insulated from the voltage applied to the screen glass 4, so the stud pin 11 is made of ceramic and the front metal part 6 is set at ground potential. Further, the front metal part 6 and the back metal part 7 are welded, and the getter container 12, which is further joined to the back metal part 7 via the getter holder 13, is formed after welding the front metal part 6 and the back metal part 7. The particles are scattered by being heated and irradiated with a laser beam from an externally provided laser beam generator through a glass window 14 provided in a part of the back metal portion 7. 15 in the figure is a shield plate.

When forming the electrode which is the electron beam control means 3, by applying an external force F to the frame 18 as shown in FIG. 2(a), the frame 18 is shaped as shown in FIG. 2(b). Leave it in a bent state. In this state, Figure 3
As shown in FIG. 2, a plurality of electrode plates 16 are hung alternately on supports 23 provided on a frame 18. When all the electrode plates 16 are applied, the force F applied to the frame 18 is released and the frame returns to its original state as shown in FIG. 2(a).

Here, the electrode plate 16 has the following structure as shown in FIG.
Place it perpendicular to the z direction. The electron beam control means 3 is constructed by overlapping the upper electrode 19 and the lower electrode 20 constructed as described above so that the electrode plates 16 form a lattice pattern. Note that, as shown in FIG. 5, an insulator 17 is sandwiched between the upper electrode 19 and the lower electrode 20.

In order to apply a predetermined potential to each electrode plate 16 and control the electron beam, a clip 22 is attached to each electrode plate 16 as shown in FIG.
The device is operated by connecting a lead wire 21 previously joined to a drive circuit (not shown).

In the flat cathode ray tube constructed as described above, as shown in FIG. 7(a), the flat cathode ray tube 40
The entire screen can be used either vertically or horizontally as shown in Figure 7(b).In any case, in order to increase the screen size and improve resolution, the Since sufficient mechanical strength can be provided even when the number of terminals drawn out to the outside of 26 increases, there is an advantage that the assembly process can be simplified.

FIG. 8 shows another embodiment of the present invention, and the ribbon-shaped electrode plates 16 used in the above embodiment need to be insulated because each plate is given a different potential. At this time, as shown in FIG. 8, a conductive film 25 is formed in advance in accordance with the length to be used before being stretched on the frame 18, and the insulating part 25 where the original base material of the insulating material is exposed is
The insulation of the electrode plate 16 can be maintained by ensuring that the electrode plate 16 just hangs over the support 23.

Further, in the embodiment shown in FIG. 8, the conductive film 25 was formed before the ribbon-shaped electrode plate 16 was stretched, but after the ribbon-shaped electrode plate 16 was stretched on the frame 18, the vapor deposition method or the etching process was performed. Even if the conductive film 25 is formed by processing, the same effect as in the above embodiment can be obtained.

[0021]

As described above, according to the present invention, since tension is applied to the electrode plates and the electrode plates are fixedly supported by the frame, it is possible to suppress malfunctions caused by contact due to shaking of the electrode plates. Therefore, the pitch between the electrode plates can be reduced to improve resolution and brightness. In addition, after bending the frame in advance and stretching the ribbon-shaped electrode plate, all you have to do is restore the frame's bend, which simplifies the assembly process and reduces product variation.
Reliability can also be improved, making it easier to use, for example, high-definition picture tubes that require high reliability. Furthermore, since it can be placed horizontally or vertically, the conditions of use can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a flat cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the deflection of the frame due to external force.

FIG. 3 is a diagram illustrating how to hang an electrode plate on a frame.

FIG. 4 is a diagram illustrating the arrangement of electrode plates in the z direction.

FIG. 5 is a diagram illustrating a joint between an upper electrode and a lower electrode.

FIG. 6 is an enlarged schematic perspective view of the main parts of the electrode plate.

FIG. 7 is an explanatory diagram of an example of use of a flat plate cathode ray tube.

FIG. 8 is a diagram illustrating the configuration of a ribbon-shaped electrode plate.

FIG. 9 is a configuration diagram showing a conventional flat plate cathode ray tube.

FIG. 10 is a diagram illustrating an electrode plate used in a conventional flat-plate cathode ray tube.

FIG. 11 is a diagram illustrating the arrangement of electrode plates used in a conventional flat-plate cathode ray tube in the z direction.

[Explanation of symbols]

1 Cathode part 2　Electron beam extraction means 3　Electron beam control means 4 Screen glass 5 Phosphor layer 9 Electrode group 16　Electrode plate 18 Frame 23 Post 24 Insulation section 25 Conductive film 40　Flat type cathode ray tube

Claims (3)

[Claims] 1. A storage container comprising a screen glass and a metal part, in which a cathode section as an electron beam source, an electron beam extraction means for taking out an electron beam from the cathode section, and an electron beam taken out. In the flat cathode ray tube, the screen glass is provided with an electron beam control means for controlling the direction of the electron beam, and a phosphor layer is formed on the screen glass to emit light upon impact of the direction-controlled electron beam. When the direction of a certain slit-shaped electrode plate is perpendicular to the screen direction, a ribbon-shaped electrode plate is stretched on a pre-deflected frame, and tension is applied to the electrode plate by the return of the frame's deflection. A flat plate cathode ray tube characterized by: 2. Claim 1, wherein the material of the ribbon-shaped electrode plate has insulating properties, and a conductive film is formed in advance to match the length to be used before it is stretched on a frame.
flat-plate cathode ray tube. 3. The flat plate type according to claim 1, wherein the material of the ribbon-shaped electrode plate has insulating properties, and a conductive film is formed after the electrode plate is pasted on the frame. cathode ray tube.