JPS6334842A - Image display device - Google Patents

Abstract

PURPOSE:To eliminate the periodical uneven brightness produced from the oscillation of the image, and to prevent the image defect, by arranging a metal spacer between a linear cathode and the uppermost electrode plate of an electrode group, and an oscillation-resisting spacer between the cathode and a vertical scanning electrode. CONSTITUTION:Between a linear cathode 5 and the G1 electrode 7, a metal spacer 4 is arranged in the form of having cross pieces sucessive in the V direction and cutting off a passage of electron beams in the H direction. And between a vertical scanning electrode 2 and the cathode 5 is arranged an oscillation-resisting spacer 3 having plural cross pieces in the direction crossing to the linear cathode 5, and made of a material of an insulator or a metal plate coated with an insulator. Therefore, the oscillation of the linear cathode 5 can be prevented securely, consequently the periodical uneven brightness from the oscillation is eliminated on the image screen, and the image with no defect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to color television receivers, computer terminals, etc.
The present invention relates to an image display device used for a display or the like.

2. Description of the Related Art A prior art image display device by the applicant of the present invention has a structure shown in FIG. In reality, each electrode is housed in a vacuum envelope (glass container), but
In the figure, the vacuum envelope is omitted to make the internal electrodes clear. I can't display images, text, etc. yet.
Screen horizontal direction (c).

The vertical direction (toward) of the screen is illustrated.

A plurality of linear cathodes 26 are arranged independently at equal intervals in the H direction. A linear cathode 26 is located on the opposite side of the face grade portion 4o across the linear cathode 26.
A vertical scanning electrode 21 formed on an insulating support 20 is disposed adjacent to the insulating support 20, and together with a linear cathode 26 serves as an electron beam generating section. Reference numeral 22 is a bank spacer, which is a metal plate in which insulation is applied to both sides of a metal plate with a relief part such as a half-etting/groove, and 23 is a spacer for fixing the fiber.
On this spacer, a glass fiber 24 is placed on a thin metal plate 25.
The position is fixed by. Back spacer 22
and the fiber fixing spacer 23 are connected to the linear cathode 26.
, electrically insulating and positioning the vertical scanning electrode 21 and the subsequent planar electrode. Next, a plurality of planar electrodes each having an opening in a portion corresponding to the linear cathode 26 are arranged as an electron beam deflection/convergence section. In order, the first grid electrode 28, the second grid electrode 29, the third grid electrode 30,
The vertical deflection electrodes 31 and 32, the fourth grid electrode 33, and the following, respectively, the G1 electrode 28, the G2 electrode 29, the G3 electrode 3Q,
They are referred to as a Dv1 electrode 31, a D2 electrode 32, and a G4 electrode 33. A spacer is inserted between each electrode from the G1 electrode 28 to the G4 electrode 33 for the purpose of ensuring electrical insulation wire between each electrode and accuracy of the electron beam traveling direction. The spacer consists of only an insulator, or a metal plate with insulation treatment on both sides, and has a continuous crosspiece in the V direction.
In the H-bj direction, the part through which the electron beam passes is removed. Note that in FIG. 2, the shapes and configurations of each planar electrode are omitted for clarity. G4 is used as an electron beam deflection section after the pole 33, and electrodes formed on both surfaces of a base 34 which is long in the direction {circle around (2)} correspond to the positions between the linear cathodes 26. Multiple stages are provided towards the side. The figure shows a three-stage case as an example, and each electrode is a first horizontal deflection electrode 35, a second horizontal deflection electrode 3
6, a third horizontal deflection electrode 37, hereinafter referred to as a DH-1 electrode 35, a DH-2 electrode 36, and a DH-3 electrode 37, respectively. On the inner surface of the face plate section 40, a light emitting section is formed, which is composed of a fluorescent surface 39 and a metal back electrode 38, and emits light when stimulated by an electron beam. Each of the above-mentioned components is held in a state of being compressed by atmospheric pressure within a vacuum envelope (not shown).

Next, the operation of the image display device will be explained.

When a current is passed through the linear cathode 26 to heat it, and a voltage higher than that of the linear cathode 26 is applied to the G2 electrode 29, the linear cathode 26 is heated.・Uyori G1 electrode 2
8) The main T-beam fires toward the 1st hole. G1
The electron beam passes through the aperture of the electrode 28 and then passes between the DH-1 electrode 36, DH-2 electrode 36, and DH-3 electrode 37 which face the electron beam section, but the electron beam is not illuminated by these electrodes. A predetermined voltage is applied so that the spot is at a predetermined position and has a small diameter on the optical surface 39.

Problems to be Solved by the Invention However, in the above configuration, after inserting the internal components into the envelopes, when sealing the envelopes together and vacuum-sealing them, approximately
When subjected to a thermal history of 00 degrees Celsius, the fiber fixed by a thin metal plate on the fiber fixing spacer becomes deformed and the predetermined positional accuracy cannot be maintained, resulting in vibration of the linear cathode and image defects. There was a problem. This is due to the following reasons.

In other words, due to the high current that flows when the linear cathode is activated, the temperature of the linear cathode becomes as high as about 700 to 800°C.
Ordinary soda glass will not melt at this temperature, so 1 fit glass with good heat resistance is used as fiber, + 1
- is used. Toko・') is 5. Cj English glass has a very small thermal expansion coefficient of 7t, and a large difference in thermal expansion occurs between it and the metal fiber fixing spacer. When the temperature rises, the spacer for fixing the fiber, which has a large coefficient of thermal expansion, expands greatly in the H direction, whereas the fiber hardly stretches, so it behaves as if it were moving under the thin metal plate. On the other hand, when cooling, the opposite phenomenon occurs; fibers have very low bending rigidity, so when a compressive load is applied, they buckle.
Become a state. For this reason, the fiber becomes deformed after thermal history.

In view of the above-mentioned problems, the present invention has a structure that reliably prevents the linear cathode from being photographed while maintaining positional accuracy even after the thermal history during vacuum sealing, and prevents periodic brightness unevenness caused by vibration of the image. The purpose of the present invention is to provide an image display device that is free from image defects.

Means for Solving the Problems To solve the above problems/In order to solve the above problems, the image display device q of the present invention
In the v direction [,]], the one desecrated crosspiece is also moved in the 7, H direction (・
It has a passage for the electron beam, a metal spacer placed between the linear cathode and the G1 electrode, and multiple thin bars in the direction that intersects the linear cathode, on both sides of the insulator or metal plate. The spacer in the electron beam source is made of a material coated with an insulator, and includes an integrated vibration-proofing spacer placed between a linear cathode and a back scanning electrode.

For production The effect of this technical means is as follows.

In other words, since the thickness accuracy of the metal plate is very good at ±6 μm or less, by placing a metal spacer between the linear cathode and the 01 electrode (the uppermost electrode plate of the electrode group), the back scanning electrode and the linear cathode A plurality of thin beams in the V direction in the direction intersecting the linear cathode in the vibration isolating spacer arranged between the two are arranged adjacent to the linear cathode with the accuracy of the plate thickness of the metal spacer. In addition, since the above-mentioned vibration isolation spacer is made of an insulator or a metal plate coated with an insulator on both sides, the overall coefficient of thermal expansion is lower than that of a single metal plate, but since it is composed of a single piece or a clad material, it is vacuum sealed. Since it does not deform due to the thermal history of the vibration-proofing spacer, it is possible to maintain the thin crosspiece of the vibration-proofing spacer adjacent to the linear cathode, and as a result, vibration of the linear cathode can be prevented. This is what happens.

Example Examples of the present invention will be described below.

FIG. 1 shows the structure of an image display device showing an embodiment of the present invention.In reality, each electrode is housed in a vacuum envelope (glass container), but the internal electrodes are not shown in the figure. The vacuum envelope has been omitted for clarity. However, part of the face part that becomes the vacuum envelope is shown, and in order to clarify the horizontal and vertical directions of the screen that displays images, characters, etc.
A vertical view of the screen is illustrated.

First, a plurality of linear cathodes 5, each of which has an oxide deformation formed on the surface of a tungsten wire, are arranged independently at equal intervals in the H direction, and an appropriate tension is applied in the (2) direction. On the opposite side of the face plate portion 19 across the linear cathode 5, there are strips disposed on the insulating support 1 in close proximity to the linear cathode 5 at equal pitches in the V direction and electrically divided and elongated in the H direction. Vertical scanning electrodes 2 are arranged. The vertical scanning electrodes 2 are formed as independent electrodes corresponding to the number of horizontal scanning lines in the V direction (approximately 480 in the case of the NTSC system) for normal television display. Next, between the linear power node 5 and the face plate portion 19, openings are provided in parts corresponding to the linear cathode 5 and the vertical scanning electrode 2 in order from the linear cathode 5 side, so that the respective electrodes A video signal is applied to perform beam modulation, and a plurality of mutually divided planar electrodes and spacers are alternately arranged between linear cathodes 5 located in the vicinity. The planar electrodes have openings similar to those of the first grid electrode (hereinafter referred to as the G electrode) and the G1 electrode, and form a linear cathode 5.
A second grid electrode (hereinafter referred to as G2) 8 is used to generate an electron beam from the electron beam, a third grid electrode (hereinafter referred to as G3 electrode) 9 is used to shield the electric field generated by the subsequent electrode from the electron beam generation electric field, and the opening is By arranging two electrodes 10 and 11 having wider apertures in the H direction than in the H direction, and shifting the center axes of the apertures in the two electrodes in the V direction, a vertical deflection electrode (hereinafter referred to as D1 electrode 10. A DV2 electrode 11) is formed. D
At the rear stage of the V2 electrode 11, there is a V
The fourth grid electrode (hereinafter referred to as G4), which is larger in the H direction than in the
) 12 is placed.

Next, two types of spacers are inserted between the vertical scanning electrode 2 and the G1 electrode 7. First, linear Kandoro and G1
Between the electrodes 7, there is a continuous crosspiece in the ■ direction, and in the H direction, the part through which the electron beam passes is removed, and the plate thickness corresponds to the distance between the linear cathode 5 and the G1 electrode 7. An integral metal spacer 4 is arranged. In addition, the vertical scanning electrode 2
Between the linear cathode 5 and the linear cathode 5, there is a plurality of thin beams in the V direction in the direction intersecting the linear cathode 6, and the material is made of an insulating material or a metal plate coated with an insulating material on both sides, and is perpendicular to the linear cathode 5. An integrated anti-vibration spacer 3 having a thickness corresponding to the distance between the scanning electrodes 2 is arranged. The metal spacer 4 and anti-vibration spacer 3 adopted in this example each have a plate thickness of 0.
．． 2 mm, the material is 42-6 alloy, and the anti-vibration spacer 3 is subjected to CVD treatment of Aa2Q3 on both sides. On the other hand, spacers (not shown) are inserted between the electrodes from the G1 electrode to the G4 electrode 12 in order to ensure electrical insulation between the electrodes and precision in the direction of electron beam movement.

The shape has continuous bars in the V direction, with the part through which the electron beam passes removed in the H direction, and the material is, for example, a single piece of glass or a base metal coated with an insulating material such as frit glass on both sides.

After the G4 electrode 12, a plurality of electrodes are provided on both surfaces of an insulating horizontal deflection electrode base 13 extending in the V direction between the linear cathodes 5 and facing toward the face plate portion 19. Figure 1 shows a case of three stages as an example, and each electrode is connected to the first horizontal deflection electrode (hereinafter referred to as DH-1 electrode)1.
4. Second horizontal deflection electrode (hereinafter referred to as DH-2 electrode) 15. Third
This will be referred to as a horizontal deflection electrode (hereinafter referred to as a DH-3 electrode) 16. DH-
The same voltage as the DC voltage applied to the metal back electrode 1 of the face plate portion 19 is applied to the third electrode 16,
A voltage for horizontal focusing of the electron beam is applied to the DH-1 electrode 14 and the DH-2 electrode 15. A fluorescent surface 18 and a metal back electrode 1 are provided on the inner surface of the face plate portion 19.
A light emitting layer consisting of 7 is formed. In the case of color display, the phosphor surface 18 is formed with phosphor stripes of light (8), green p, and blue (uniform) sequentially in the H direction through a black garband.

Next, to explain the operation of the image display device, the three linear cathodes 5 are heated by passing current through them, and G
A voltage approximately the same as the potential of the linear cathode 5 is applied to the first electrode 7 and the vertical scanning electrode 2. At this time, the electron beam goes straight from the linear cathode 5 toward the G electrode 7 and the G2 electrode 8,
A voltage higher than the potential of the linear cathode 5 (for example, 200 to 300 V) so that the electron beam passes through each planar electrode aperture.
is applied to the G2 electrode 8. ON at linear cathode 5
state (emitting electron beam) and OFF state (
heating state) can be realized by changing the pulse voltage applied to the linear cathode 5 and the vertical scanning electrode 2 in each state. The electron beam passing through the aperture of the G2'i pole 8 is transferred to the G3 electrode 9-Dvl electrode 10→D■2 electrode 1
1→G4 electrode 12 - horizontal deflection electrodes 14, 16, and 16, and a predetermined voltage is applied to these electrodes so that the electron beam becomes a small spot on the fluorescent surface 18.

Here, the beam focus in the ■ direction is performed by an electrostatic lens system formed between the G3 electrode 9, the vertical deflection electrodes 10 and 11, and the G4 electrode 12, and the beam focus in the H direction is performed by the D
H-1 electrode 14, DH-2 electrode 15, DH-3 electrode 16
This is done using an electrostatic lens system formed between each of the two. The two electrostatic lens systems mentioned above are formed only in the V direction and the H direction, respectively, so that the spot sizes of the electron beam in the (1) direction and the H direction can be adjusted individually.

Finally, the functions of the metal spacer 4 and the anti-vibration spacer 3 will be described. The accuracy of the electron beam traveling direction of the linear cathode 5 is ensured by the fiber 6 provided on the G1 electrode 7. That is, since the fiber 6 has a diameter of 0.2 mm, the linear cathode 5 is maintained at a position 0.2 mm from the G17 electrode 7. On the other hand, anti-vibration space @j3ba G1 electric shock 7
Although it is arranged through a metal spacer 4 provided above,
Since the thickness of the spacer 4 is 0.2 mm, the thin crosspiece of the vibration-proofing spacer 3 adjoins the linear cathode 5 in such a way that it presses against the linear cathode 5 by the diameter of the line.

Effects of the Invention As described above, since the present invention has the above configuration, thermal deformation of the vibration isolating portion of the vibration isolating spacer during vacuum sealing can be avoided, and the positional accuracy of the vibration isolating portion can be maintained at the initial accuracy. If possible, vibration isolation of the linear cathode can be achieved reliably. As a result, periodic brightness unevenness caused by vibrations is eliminated on the screen, and a defect-free image is obtained. In addition, since the above-mentioned anti-vibration spacer is an integrated type, steady brightness unevenness caused by variations in accuracy between the linear cathode and the G1 electrode can be largely eliminated, and at the same time, it can reduce the number of man-hours and parts in terms of mass production and workability. This makes it possible to significantly reduce costs.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of an image display device showing an embodiment of the present invention;
FIG. 2 is a perspective view showing an example of a conventional image display device. 2... Vertical scanning electrode, 3... Anti-vibration spacer, 4... Metal spacer, 5... Linear cathode, 7... First Grid electrode (top electrode plate of electrode group). Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] Equipped with an electron beam generation source consisting of a linear cathode, a vertical scanning electrode, and a spacer, an electrode group for converging and deflecting the electron beam, and an electron beam emission section, each of the above members is sandwiched by atmospheric pressure in a vacuum envelope. In a screen display device under pressure,
The spacer in the electron beam generation source has a continuous crosspiece in the vertical direction of the screen, has an electron beam passage part in the horizontal direction of the screen, and is arranged between the linear cathode and the uppermost electrode plate of the electrode group. The linear cathode and the vertical scanning electrode are made of an insulating material or a metal plate coated with an insulating material, and have a plurality of thin crosspieces in the direction perpendicular to the screen in the direction that intersects the linear cathode. 1. An image display device comprising: an integrated anti-vibration spacer disposed in between;