JPH0451429A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent misconvergence of electron beam against shock application to a CRT by allowing an insulative support to support an electrode except a convergence cup of an electron gun, and furnishing a shock absorbing means between the convergence cup and a final acceleration electrode. CONSTITUTION:Each electrode except a convergence cup 13 is supported by an insulative support 15 with the aid of a supporting structure 14 which protrudes to outside the electrode. The part between the convergence cup 13 and a final acceleration electrode 12 is not borne directly, and a shock absorbing means 19 is provided. An L-form connecting structure 20a is provided for mechanical and electrical connection to the supporting structure 14 of the final acceleration electrode 12 adjacent to the convergence cup 13, and the fluorescent surface side edge of this L-form connecting structure 20a is welded to the convergence cup 13. The connecting structure 20a is resilient and exerts the shock absorbing effect to absorb shocks conducted to the convergence cup 13 held by a bulb spacer 18, and thereby shock conduction is precluded to the final acceleration electrode 12 borne by the insulative support 15 or other electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cathode ray tube, and more particularly to a cathode ray tube equipped with an electron gun having good characteristics against shock and vibration.

(Prior art) Below, the configuration of a general cathode ray tube is shown in Figures 5 to 7.
This will be explained based on the diagram.

FIG. 5 shows a cross section of a typical cathode ray tube. In FIG. 5, the cathode ray tube has a panel section 2 having a fluorescent screen 1 formed on its inner surface.
, a neck part 4 connected from this panel part 2 via a funnel part 3, an electron gun 6 installed in this neck part 4 that generates, controls, and accelerates electron beams 5R, 5G, and 5B, and a funnel part. An internal conductive film 7 is uniformly applied from the inner wall of the neck part 3 to a part of the neck part 4.

As shown in FIG. 6, the electron gun 6 of this cathode ray tube includes at least a cathode 8 that emits electron beams 5R, 5G, and 5B, a control electrode 9, an accelerating electrode 10, a focusing electrode 11, and an accelerating high voltage. A final acceleration electrode 12 that accelerates the applied electron beams 5R, 5G, and 5B toward the phosphor screen 1 and a convergence cup 13 that has the same potential as this final acceleration electrode are connected along the traveling direction of the electron beams 5R, 5G, and 5B. The electrodes are arranged in such a manner that they are supported by an insulating support 15 via a support structure 14 that protrudes outward from each electrode. Also,
As shown in FIG. 7, the convergence cup I3 is directly welded to the final accelerating electrode I2 supported by the insulating support I5. The end of the electron gun 6 on the cathode 8 side is connected via an inner lead 16 to a stem pin 17 embedded in the end of the neck portion 4 to establish electrical continuity and obtain a voltage supply from outside the tube. Further, the end of the electron gun 6 on the side of the phosphor screen 1 is connected to the convergence cup 13 and comes into contact with the internal conductive film 7 formed on the inner wall of the funnel part from a part of the neck part 4 via a bulb spur 18 made of conductive metal. , holds an electron gun 6 within the neck portion 4.

Here, the valve spacer 18, which has both the role of electrical continuity with the internal conductive film 7 and the role of holding the electron gun, is particularly susceptible to external shocks and vibrations (hereinafter referred to as Electron gun 6 for "shock etc.")
In order to hold the electron gun 6 stably and prevent deterioration of the characteristics of the electron gun 6 and, by extension, the cathode ray tube, due to shocks, etc., the spring constant tends to be large.

(Problem to be Solved by the Invention) The spring constant of the valve spacer 18 inevitably increases due to the above-mentioned requirements for shock, etc., but due to this influence, the internal conductive film in contact with the valve spacer 18 increases. Peeling of the electron beams 5R, 5G, and 5B not only causes deterioration of the withstand voltage quality, but also causes distortion and stress in the electron gun 6 itself due to external shocks, which impairs the convergence characteristics of the electron beams 5R, 5G, and 5B onto the phosphor screen 1. There is also a risk that the inner lead 16 may be bent or cut due to deterioration or displacement of the electron gun 6.

” The deterioration of the convergence characteristics described above is due to the fact that the electrodes of the electron gun are not integrated, and the red, green, and blue electron beams 5R, 5G
, 5B, and each of the independent electrodes is mechanically tilted so that the three electron beams 5R, 5G, and 5B of red, green, and blue are appropriately concentrated at the screen center perpendicular to the tube axis. This is particularly noticeable in cathode ray tubes equipped with delta-type electron guns.

When an external impact is applied, the impact is first transmitted to the convergence cup 13 via the valve spacer 18. Thereafter, this impact etc. is transmitted to the final acceleration electrode 12 which is directly connected to the compassence cup 13, and applies strain stress to the final acceleration electrode 12. As a result, the distance between the final accelerating electrode 12 and the adjacent electrodes on the cathode 8 side of the final accelerating electrode 12 may change, and in extreme cases, the shape of the final accelerating electrode 12 may be distorted, and the electric field formed between these electrodes may change. The lens will become distorted. Furthermore, if the impact or the like is transmitted to other electrodes via the insulating support 15, the electric field lens formed by the other electrodes will be similarly distorted.

Due to such distortion of the electric field lens, the electron beam 5R5G
, 5B's traveling direction changes. Therefore, the three electron beams 5R, 5 of red, green, and blue that were concentrated in one point at the center of the screen
The convergence of G and 5B will shift, resulting in a significant deterioration of the convergence characteristics. This phenomenon of convergence characteristic deterioration is also observed in cathode ray tubes equipped with in-line electron guns that emit three electron beams arranged in a line, which is currently the mainstream, although there are differences in degree.

In order to prevent the above-mentioned convergence deviation, shocks applied to the cathode ray tube are transmitted to the convergence cup 13 via the valve spacer 18, and the insulating support 15
must be prevented from being transmitted to the final acceleration electrode j2 and other electrodes via the Previously, Convergence Cup 1
3 to the final accelerating electrode 12 supported and fixed by the insulating support 15 and other electrodes, the convergence cup 13 and the final accelerating electrode 12 were directly welded. There was a drawback that the signal was transmitted to the electrode.

The present invention has been made in view of the above-mentioned drawbacks, and is designed to prevent the convergence of the three electron beams of red, green, and blue, which are appropriately concentrated at the center of the screen, from shifting due to shocks applied to the cathode ray tube. The present invention provides a cathode ray tube with good characteristics.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the problems described above, the present invention includes a panel portion having a fluorescent screen formed on its inner surface, and an electron gun facing the fluorescent screen mounted inside. and a funnel portion that connects the panel portion and the neck portion and has an internal conductive film formed on its inner surface, and the electron gun has a cathode that emits at least an electron beam, and a funnel portion that controls the electron beam. ·acceleration·
A focusing electrode, a final accelerating electrode to which an accelerating high voltage is applied to accelerate the electron beam toward the fluorescent screen, and a convergence cup having the same potential as the final accelerating electrode are arranged along the traveling direction of the electron beam. a bulb spacer configured such that the cathode side end of the electron gun is connected to the stem pin at the neck end via an inner lead, and the phosphor screen side end is provided at the phosphor screen side tip of the convergence cup. In the cathode ray tube, which is in contact with the internal conductive film through the electron gun, electrodes other than the convergence cup of the electron gun are supported and fixed by an insulating support, and a shock absorbing means is provided between the convergence cup and the final acceleration electrode. It is characterized by being provided with.

(Function) External shocks that propagate from the valve spacer to the convergence cup, and then directly to the final acceleration electrode, are removed from direct support between the convergence cup and the final acceleration electrode, and are transferred to the convergence cup via the shock absorbing means. By separating the cup and the electrode, which is supported and fixed by an insulating support except for this convergence cup, the impact does not directly reach the final acceleration electrode, but is absorbed by the shock absorbing means, and is further passed through the insulating support to the final acceleration electrode. Alternatively, it reduces the impact that has been applied to other electrodes.

As a result, the distortion of the electric field lens formed by the final accelerating electrode and the adjacent electrode on the cathode side is suppressed.

Furthermore, distortion of the electric field lens formed by other electrodes is also suppressed.

Furthermore, even if the distance between the convergence cup and the final acceleration electrode changes due to an impact or the like, the convergence cup and the final acceleration electrode are at the same potential, and no electric field lens is formed between these electrodes, so the electron beam does not affect convergence.

As a result, red, which was traditionally concentrated in the center of the screen,
Convergence shift due to impact of the three green and blue electron beams can be suppressed, and deterioration of screen quality can be prevented.

Furthermore, by providing a shock absorbing means between the electrode supported and fixed on the insulating support and the convergence cup,
It is possible to prevent the electron gun from being displaced due to impact or the like, and also to prevent the inner lid from being bent or cut, which may occur due to the positional displacement.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. The same reference numerals as in the conventional example indicate the same parts.

The overall configuration of the cathode ray tube is the same as that of the conventional example shown in FIG. The electron beams 5R, 5G are installed in this neck part 4,
An electron gun 6 for generating, controlling, and accelerating the electron beam 511 is provided with an internal conductive film 7 uniformly applied from the inner wall of the funnel section 3 to a part of the neck section 4. FIG. 1 shows a cross section of the neck portion of a cathode ray tube according to the present invention. Electron gun 6 is the first
As shown in the figure, at least the electron beams 5R, 5G,
A cathode 8 that emits 5B, and electron beams 5R, 5G, 5
A control electrode 9 for controlling electron beams B, an accelerating electrode 10, a focusing electrode 11, and an accelerating high voltage applied to the electron beams 5R, 5G,
A final accelerating electrode 12 accelerates electron beams 5B toward the fluorescent screen, and electron beams 5R, 5G, and 5B at the same potential as the acceleration high voltage.
A convergence cup 13 forming a stable acceleration region is arranged along the traveling direction of the electron beams 5R5G, 5B. and is supported by an insulating support 15. The cathode 8 side end of the electron gun 6 is connected to the stem pin 17 embedded in the neck 4 end via the inner lead 16 to establish electrical continuity, and a voltage supply is obtained from the outside. The electron gun 6 is connected to the internal conductive film 7 formed on the inner wall of the funnel part 3 from a part of the neck part 4 via a bulb-the-spacer 18 made of conductive metal whose side end is joined to the convergence cup 13 . is held within the neck portion 4. Further, the convergence cup 13 and the final acceleration electrode 12 are not directly supported, but a shock absorbing means 19 is provided. As described above, the cathode ray tube according to the present invention includes the stem pin 17, the inner lead 16, the electrode supported and fixed by the insulating support 15, and the shock absorbing means 1 at the neck portion.
9, Convergence cup 13, Valve suspension spacer 18
are arranged along the traveling direction of the electron beams 5R, 5G, and 5B.

FIG. 2 shows one configuration of the shock absorbing means 19 shown in FIG. 1. As shown in FIG. 2, an L-shaped connection structure 20a mechanically and electrically connected to the support structure 14 of the final acceleration electrode 12 adjacent to the convergence cup 13 is provided. By welding the side portions of the phosphor screen to the convergence cup 13, a predetermined space 21 is provided between the convergence cup 13 and the final accelerating electrode 12, thereby forming a shock absorbing means 19.

In this way, as shown in FIG. 7, the convergence cup 13 is no longer integrated with the bottom of the fluorescent screen side of the final accelerating electrode I2 by direct welding and supported on the insulating support 15. The cup 13 is attached to the insulating support 15
Instead of directly supporting the structure 20a and the space 21
The connection structure 20a has a shock absorbing effect as an elastic body through the shock absorbing means I9 consisting of
It is possible to absorb the impact transmitted to the electrode 3 and prevent the impact from being transmitted to other electrodes including the final acceleration electrode 12 supported and fixed on the insulating support 15. In addition, the shock absorbing means 19 may be replaced with the above-mentioned 1? With this structure, the same components as the conventional cathode ray tube can be used except for the connection structure 20a, so there is a great advantage in terms of manufacturing.

” In order to evaluate the convergence characteristics against impact etc. in the above example, three electron beams of red, green and blue were used, 5R and 5G.
, 5B are concentrated at one point at the screen center of the cathode ray tube, an impact of 30G to 40G is applied to the panel part 2 or neck part 4 envelope of the cathode ray tube, and the three electron beams 5R,
We measured how much 5G and 5B change and move.

In conventional cathode ray tubes, the maximum change due to impact of the three red, green, and blue electron beams 5R, 5G, and 5B concentrated at the center of the screen was 0.2 mm = 0.3 mm. According to the cathode ray tube implementing the present invention, three electron beams 5R of red, green, and blue are concentrated at the center of the screen.
, 5G, and 5B can be suppressed to within 0.1 mm, making it possible to suppress deterioration of convergence characteristics at the center of the screen. Also,
If the convergence shift at the center of the screen becomes large, the diagonal corners of the screen will inevitably move even more than the center of the screen. Currently, the allowable range of convergence deviation at the screen corner of a cathode ray tube is about OJmm, but in a conventional cathode ray tube,
Even at the center of the screen, there is a movement of the electron beams 5R, 5G, 5B by 0.2 mm = 0.3 mm, and at the corners of the screen, the electron beams 5R, 5G, 5B are within the above tolerance range.
It was impossible to suppress the amount of movement of 5B.

However, according to the present invention, it is possible to suppress the movement amount of the electron beams 5R15G and 5B within the above-mentioned allowable range,
It is possible to significantly improve the quality.

In addition, as shown in FIG. 3, only a part of the phosphor screen side of the L-shaped connection structure 20b is welded, and the bent portion of the connection structure 20b is not welded to the convergence cup 13, leaving a gap. It may have a different structure. By adopting the structure shown in FIG. 3, the elastic action of the connection structure 20b can be enhanced, and the shock absorption action is improved compared to that shown in FIG. 2.

”-The embodiment includes a connection structure 20 as a shock absorbing means 19 between the convergence cup 13 and the final acceleration electrode 12.
Although the space portion 21 is provided through the space portions 20a and 20b, the present invention is not limited to the above embodiments, and as shown in FIG.
A shock absorber 22 may be sandwiched and supported between the convergence cup 13 and the final acceleration electrode 12.

The shock absorber 22 as the shock absorber 19 may or may not be a conductor; in the case of an insulator, it can be used as a convergence cup if an electrical connection means between the convergence cup 13 and the final acceleration electrode 12 is provided as a separate film. 13 and the final accelerating electrode 12 can be at the same potential.

With the above configuration, external shocks and the like are absorbed by the shock absorber, and the shock absorber also acts as a shield against undesired electric or magnetic fields.

Furthermore, it is also possible to combine the above embodiments, and the shock absorbing means between the convergence tube and the final accelerating electrode according to the present invention is not limited to the above embodiments.

As mentioned above, similar to cathode ray tubes equipped with a delta type electron gun, cathode ray tubes equipped with an inline type electron gun also tend to have a shift in convergence due to external shocks. Needless to say, it is also effective for cathode ray tubes equipped with the same method.

Note that the structure similar to the present invention is disclosed in Japanese Patent Application Laid-Open No. 63108.
There are those shown in Japanese Patent No. 648 and Patent Box No. 1.547.721. What is disclosed in Japanese Patent Application Laid-Open No. 63-108648 is to divide the final accelerating electrode in order to cut off the eddy current generated in the final accelerating electrode by a high frequency deflection magnetic field. is completely different. Furthermore, the above-mentioned Japanese Patent Application Laid-Open No. 63-108648 does not include any description regarding improvement of impact resistance, nor does it disclose any specific electrode support means for this purpose. In contrast, the present invention provides specific means for improving impact resistance, and is clearly different from the above-mentioned Japanese Patent Application Laid-Open No. 108648/1983.

Furthermore, the embodiment shown in Patent Box No. 1.547.721 is similar to the embodiment shown in FIGS. 2 and 3 in that there is a space between the final acceleration electrode and the convergence cup. There is. However, the patent box 1.547.72
As shown in No. 1, when the compassence cup is also supported and fixed on an insulating support and all the electrodes that make up the electron gun are integrated with the insulating support, external shocks are transmitted to the insulating support and an electric field lens is formed. may be distorted. moreover,
There is a possibility that the electron gun may be misaligned due to impact or the like, and the inner lead may be bent or cut. In contrast, in the present invention, the electrodes that form the electric field lens are supported and fixed by an insulating support, and a shock absorbing means is provided between the electrodes that do not form the electric field lens to absorb the impact, etc., as disclosed in Patent Box 1.547. It is obvious that it is different from No. 721. Further, Patent Box No. 1.547.721 suppresses the discharge current by using a resistor, and the effect is different from that of the present invention.

[Effects of the invention] As explained above, by providing a space between the convergence cup and the final accelerating electrode, the ability to hold the electron gun stably against external shocks, etc. is provided, and the shocks, etc. It is possible to suppress deterioration of the convergence characteristics of the electron beam transmitted to the electrodes constituting the electron gun, thereby preventing deterioration of screen quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the vicinity of the neck of a cathode ray tube showing an embodiment of the present invention, FIG. 2 is a schematic view showing one structure of the shock absorbing means of the electron gun shown in FIG. FIG. 4 is a schematic diagram showing another embodiment of the shock absorbing means according to the present invention, and FIG.
The figure is a schematic sectional view showing the configuration of a conventional cathode ray tube, and FIG. 6 is a schematic sectional view of the vicinity of the neck of the cathode ray tube in FIG.
FIG. 7 is a schematic diagram showing a state in which the convergence cup of the cathode ray tube in FIG. 5 is supported. 1... Fluorescent screen 2... Panel part 3...
Funnel part 4... Neck part 5... Electron beam 6... Electron gun 7... Internal conductive film 8...
・Cathode 9...Control electrode 10...Acceleration electrode 1...Focusing electrode 12...Final acceleration electrode 3
...Convergence cup 4...Support structure 15...Insulating support body 6.
...Inner lead 17...Stem pin end...Valve spacer 19...Shock absorbing means 20a 0b...Connection structure 2I...Space 22...Shock absorber

Claims (1)

[Scope of Claims] A panel portion having a phosphor screen formed on its inner surface, a neck portion having an electron gun mounted therein facing the phosphor screen, and an internal conductive film connecting the panel portion and the neck portion and forming an internal conductive film on the inner surface. a funnel portion in which the electron gun emits at least an electron beam;
An electrode that controls, accelerates, and focuses the electron beam, a final acceleration electrode that accelerates the electron beam toward the phosphor screen to which an accelerating high voltage is applied, and a convergence cup that has the same potential as the final acceleration electrode. The cathode side end of the electron gun is connected to the stem pin at the neck end via an inner lead, and the phosphor screen side end is connected to the phosphor screen side of the convergence cup. In the cathode ray tube that is in contact with the internal conductive film through a valve spacer provided at the tip, the electrodes of the electron gun except for the convergence cup are supported and fixed by an insulating support, and the convergence cup and the final acceleration A cathode ray tube characterized in that a shock absorbing means is provided between the electrodes.