JPH088077B2 - Cathode ray tube - Google Patents

Description

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) The configuration of a general cathode ray tube will be described below with reference to FIGS. 4 to 6.

A cross section of a general cathode ray tube is shown in FIG. In FIG. 4, the cathode ray tube includes a panel portion 2 having a phosphor screen 1 formed on the inner surface, a neck portion 4 connected from the panel portion 2 through a funnel portion 3, and an electronic device mounted in the neck portion 4. An electron gun 6 for generating, controlling, and accelerating the beams 5R, 5G, 5B, and an inner conductive film 7 uniformly applied from the inner wall of the funnel portion 3 to a part of the neck portion 4 are provided. As shown in FIG. 5, the electron gun 6 of this cathode ray tube has at least a cathode 8 for emitting electron beams 5R, 5G, 5B, a control electrode 9, an accelerating electrode 10, a focusing electrode 11, and an accelerating high voltage. A final accelerating electrode 12 for accelerating the applied electron beams 5R, 5G, 5B toward the phosphor screen 1 and a convergence cup 13 having the same potential as the final accelerating electrode are provided along the traveling direction of the electron beams 5R, 5G, 5B. The electrodes are arranged and supported by an insulating support 15 via a support structure 14 projecting to the outside of each electrode. Also,
As shown in FIG. 6, the convergence cup 13 is directly welded to the final accelerating electrode 12 supported by the insulating support 15. The end of the electron gun 6 on the side of the cathode 8 is joined to the stem pin 17 embedded in the end of the neck 4 via the inner lead 16 to establish electrical conduction, and voltage is supplied from outside the tube. Further, the end of the electron gun 6 on the side of the fluorescent screen 1 is connected to the convergence cup 13 via a valve spacer 18 made of a conductive metal to form an internal conductive film 7 formed on a part of the neck portion 4 on the inner wall of the funnel portion. Contact and electron gun 6
Are held in the neck portion 4.

Here, the valve spacer 18, which also has a role of electrical conduction with the internal conductive film 7 and a role of holding an electron gun, is used especially for an aircraft, a ship, or a vehicle mounted, and the impact or vibration from the outside (hereinafter, Electron gun 6 for "impact"
In order to keep the temperature stable and prevent the deterioration of the characteristics of the electron gun 6, and thus the characteristics of the cathode ray tube due to impact or the like, the spring constant tends to be increased.

(Problems to be Solved by the Invention) Although the spring constant of the valve spacer 18 is inevitably increased due to the above-mentioned demand for impact, the internal conductive film 7 in contact with the valve spacer 18 is affected by this influence. Peeling occurs, which not only deteriorates the withstand voltage quality but also causes distortion and stress on the electron gun 6 itself due to external impacts, etc., which deteriorates the convergence property of the electron beams 5R, 5G, 5B on the fluorescent screen 1. The inner lead 16 may be bent or cut due to the displacement of the electron gun 6.

The deterioration of the convergence characteristics is caused by the fact that the electrodes of the electron gun are not integrated and are composed of independent electrodes for the red, green, and blue electron beams 5R, 5G, and 5B, respectively, at the screen center orthogonal to the tube axis. This is particularly remarkable in a cathode ray tube equipped with a delta type electron gun in which the independent electrodes are mechanically inclined so that the three electron beams 5R, 5G and 5B of red, green and blue are appropriately concentrated.

When a shock or the like is applied from the outside, the shock or the like is first transmitted to the convergence cup 13 via the valve spacer 18. After that, this impact is transmitted to the final accelerating electrode 12 directly attached to the convergence cup 13, and gives a strain stress to the final accelerating electrode 12. As a result, the gap between the final accelerating electrode 12 and the adjacent electrode on the cathode 8 side of the final accelerating electrode 12 may change, or in extreme cases, the shape of the final accelerating electrode 12 may be distorted. The electric field lens will be distorted. Furthermore, if the impact or the like is transmitted to another electrode through the insulating support 15, the electric field lens formed by the other electrode is also distorted. Due to such distortion of the electric field lens, the traveling directions of the electron beams 5R, 5G, and 5B change. Therefore, red, which was concentrated on one point with the screen sensor,
The convergence of the green and blue three-electron beams 5R, 5G, and 5B is shifted, which causes a significant deterioration of the convergence characteristics. This phenomenon of deterioration of the convergence characteristics is recognized to some extent even in a cathode ray tube equipped with an in-line type electron gun which is the mainstream at present and which emits three electron beams arranged in a line.

In order to prevent the above-mentioned convergence deviation, impact or the like applied to the cathode ray tube is transmitted to the convergence cup 13 via the valve spacer 18, and further transmitted to the final acceleration electrode 12 and other electrodes via the insulating support 15. Must be prevented. Conventionally, when fixing the convergence cup 13 to the final accelerating electrode 12 and other electrodes supported and fixed by the insulating support 15, since the convergence cup 13 and the final accelerating electrode 12 are directly welded, impact or the like directly accelerates the final acceleration. It has a drawback that it is transmitted to the electrode 12 and other electrodes.

The present invention has been made in view of the above-mentioned drawbacks, and prevents the deviation of the convergence of the three electron beams of red, green, and blue, which are appropriately concentrated in the screen center, against the impact applied to the cathode ray tube. It is an object of the present invention to provide a cathode ray tube having excellent characteristics.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention is a neck part in which a panel portion having a fluorescent surface formed on the inner surface thereof and an electron gun facing the fluorescent surface are mounted inside. Part, a funnel part that connects the panel part and the neck part and has an inner conductive film formed on the inner surface thereof, the cathode that emits at least an electron beam by the electron gun, and the electron beam is controlled and accelerated.・
A focusing electrode, a final accelerating electrode for applying an accelerating high voltage to accelerate the electron beam toward the phosphor 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, wherein the cathode side end of the electron gun is connected to a stem pin at the end of the neck portion through an inner lead, and the glory surface side end is provided at the fluorescent surface side tip of the convergence cup. The cathode ray tube, which is in contact with the internal conductive film through the above, is provided with a shock absorbing means. That is,
Electrodes other than the convergence cup of the electron gun are supported and fixed to an insulating support through a support structure protruding to the outside of the electrode, and a connection structure having a side portion welded to the convergence cup on the support structure of the final acceleration electrode. A structure is provided, and the convergence cup is elastically retained while maintaining a space between the cathode side and the final acceleration electrode, and the shock absorbing means is formed by such a configuration. .

Further, the connection structure has a fixed side portion formed by bending the fluorescent surface side of the portion extending from the support structure to the fluorescent surface side, the fixed side portion is welded to the convergence cup at the end, and the vicinity of the bent portion is It is characterized in that it is not welded and a gap is provided between it and the convergence cup.

(Operation) According to the present invention, since the convergence cup is elastically supported, it is possible that an external shock or the like that propagates to the convergence cup by the valve spacer and eventually propagates directly to the final acceleration electrode does not directly reach the final acceleration electrode. Without
Furthermore, the impact etc. which has reached the final acceleration electrode or other electrodes through the insulating support is reduced. At this time,
Since the convergence cup is provided in the support structure for supporting and fixing the final accelerating electrode to the insulating support, impact or the like does not affect the lens forming portion of the electrode.
As a result, it is possible to suppress distortion of the electric field lens formed by the final accelerating electrode with the adjacent electrode on the cathode side, and further distortion of the electric field lens formed by the other electrode.

Even if the distance between the convergence cup and the final accelerating electrode changes due to impact or the like, the convergence cup and the final accelerating electrode have the same potential, and an electric field lens is not formed between these electrodes, so that the electron beam It does not affect your convergence.

As a result, it is possible to prevent the deviation of the convergence due to the impact of the three electron beams of red, green, and blue concentrated on the screen sensor in the related art, and prevent the deterioration of the screen quality.

Further, since the convergence cup is elastically supported by the connection structure, it is possible to prevent the position shift of the electron gun due to impact or the like, and to prevent bending or cutting of the inner lead that may occur due to the position shift.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same reference numerals as those used in the conventional example described above indicate the same parts.

The entire structure of the cathode ray tube is the same as that of the conventional example shown in FIG.
A panel portion 2 having a fluorescent surface 1 formed on the inner surface, and a neck portion 4 connected from the panel portion 2 via a funnel portion 3.
And an electron gun 6 mounted inside the neck portion 4 for generating, controlling and accelerating the electron beams 5R, 5G, 5B, and an internal conductive material uniformly applied from the inner wall of the funnel portion 3 to a part of the neck portion 4. And a membrane 7. FIG. 1 shows a cross section of a neck portion of a cathode ray tube according to the present invention. The electron gun 6 is, as shown in FIG. 1, a cathode 8 that emits at least electron beams 5R, 5G, 5B.
And a control electrode 9 for controlling the electron beams 5R, 5G, 5B, an accelerating electrode 10, a focusing electrode 11, and a final acceleration for accelerating the electron beams 5R, 5G, 5B toward the phosphor screen by applying an accelerating high voltage. electrode
12 and a convergence cup 13 that forms a stable acceleration region of the electron beams 5R, 5G, 5B at the same potential as the accelerating high voltage are arranged along the traveling direction of the electron beams 5R, 5G, 5B. The electrodes other than 13 are supported by an insulating support 15 via a support structure 14 projecting to the outside of each electrode. The cathode 8 side end of this electron gun 6 is an inner lead
Through the 16, it is joined to the stem pin 17 embedded in the end of the neck portion 4 to establish electrical conduction, and voltage is supplied from the outside, and the end on the phosphor screen 1 side is joined to the convergence cup 13 to form a conductive metal. The electron gun 6 is held in the neck portion 4 by contacting the internal conductive film 7 formed on the inner wall of the funnel portion 3 from a part of the neck portion 4 via the bulb spacer 18 made of. The impact absorbing means 19 is provided without being directly supported between the convergence cup 13 and the final acceleration electrode 12. 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, the shock absorbing means 19, the convergence cup 13, and the valve spacer on the neck portion.
18 is arranged along the traveling direction of the electron beams 5R, 5G, 5B.

FIG. 2 shows a structure of the shock absorbing means 19 shown in FIG. As shown in FIG. 2, the support structure 14 of the final acceleration electrode 12 adjacent to the convergence cup 13 is provided with a connection structure 20a bent into an L shape for mechanical and electrical connection. By welding the fixed side portion of the connection structure 20a of the mold on the phosphor screen side to the convergence cup 13, a predetermined space portion 21 is provided between the convergence cup 13 and the final acceleration electrode 12 to form the shock absorbing means 19. ing.

As described above, as shown in FIG. 6, the convergence cup 13 is stopped by being directly welded to the bottom portion of the final accelerating electrode 12 on the fluorescent screen side and integrally supported by the insulating support 15 to stop the convergence cup. Instead of directly supporting 13 on the insulating support body 15, the connection structure 20a has an impact absorbing function as an elastic body by means of the shock absorbing means 19 consisting of the connection structure 20a and the space portion 21, and the valve spacer 18 Thus, it is possible to absorb the impact transmitted by the convergence cup 13 held by the above and prevent the impact from being transmitted to other electrodes including the final acceleration electrode 12 supported and fixed to the insulating support 15. Further, by configuring the shock absorbing means 19 as described above,
Since the same structure as the conventional cathode ray tube can be used except for the connection structure 20a, the manufacturing advantage is great.

In order to evaluate the convergence characteristics with respect to impacts and the like in the above embodiment, three electron beams 5R, 5G, 5B of red, green and blue
Is concentrated at one point in the screen center of the cathode ray tube,
30G on the panel 2 or neck 4 envelope of the cathode ray tube
I applied an impact of -40G and measured how much the three electron beams 5R, 5G, and 5B moved.

In the conventional cathode ray tube, the maximum change amount due to the impact of the three electron beams 5R, 5G, 5B of red, green and blue concentrated on the screen center is 0.2 mm to 0.3 mm, whereas the present invention According to the cathode ray tube which carried out, the maximum change amount of the red, green and blue three electron beams 5R, 5G and 5B concentrated in the screen center is set to 0.
The movement amount can be suppressed within 1 mm, and deterioration of the convergence characteristics in the screen center can be suppressed. Further, if the deviation of the convergence in the screen center becomes large, the screen corner in the diagonal direction of the screen inevitably moves further than the screen center. At present, the allowable range of convergence deviation at the screen corner of the cathode ray tube is about 0.3 mm, but in the conventional cathode ray tube, there is movement of 0.2 mm to 0.3 mm of the electron beam 5R, 5G, 5B even in the screen center. , In the screen corner,
It has been impossible to suppress the movement amount of the electron beams 5R, 5G, and 5B within the allowable range. On the other hand, according to the present invention, the movement amount of the electron beams 5R, 5G, 5B can be suppressed within the allowable range, and the quality can be greatly improved.

In addition, as shown in FIG. 3, only a part of the fixed side portion of the L-shaped connecting structure 20b on the fluorescent screen side is welded to form the connecting structure 20b.
The bent portion may be structured not to be welded to the convergence cup 13 but to have a gap. With such a structure, the elastic action of the connection structure 20b can be enhanced,
The shock absorbing effect is improved over that shown in FIG.

As described above, even in a cathode ray tube equipped with an in-line type electron gun similarly to a cathode ray tube equipped with a delta type electron gun, there is a tendency for the convergence to shift due to an impact from the outside. It goes without saying that it is also effective in the cathode ray tube provided.

It should be noted that a structure similar to that of the present invention is disclosed in JP-A-63-1086.
48 and Japanese Patent No. 1,547,721. The one disclosed in Japanese Patent 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 due to the high frequency deflection magnetic field. Is completely different. Further, the above-mentioned Japanese Patent
Japanese Patent Laid-Open No. 63-108648 does not disclose improvement in impact resistance, and therefore does not disclose any specific electrode supporting means. On the other hand, the present invention provides specific means for improving impact resistance, and it is obvious that the present invention is different from the above-mentioned JP-A-63-108648. Also, Patent No. 1,547,
The 721 publication is similar to the embodiment shown in FIGS. 2 and 3 in that there is a space between the final accelerating electrode and the convergence cup. However,
As shown in Japanese Patent No. 1,547,721, if the convergence cup is also supported and fixed to the insulating support and all the electrodes that make up the electron gun are integrated by the insulating support, impacts from the outside are transmitted to the insulating support and the electric field lens. May distort. Further, the electron gun may be displaced due to a shock or the like, which in turn may cause bending or cutting of the inner lead. On the other hand, the present invention, the electrode forming the electric field lens is supported and fixed by an insulating support, shock absorbing means is provided between the electrodes not forming the electric field lens, and absorbs shock and the like, and Patent No. 1,547,721. The difference is clear. Further, Japanese Patent No. 1,547,721 is for suppressing the discharge current by a resistor, and the action and effect are different from those of the present invention.

[Effects of the Invention] As described above, by providing a space between the convergence cup and the final accelerating electrode, the electron gun can be stably held against external shocks and the like, and shocks and the like can be used in the cathode ray tube. It is possible to suppress deterioration of the convergence characteristics of the electron beam transmitted through the electrodes constituting the electron gun, and prevent deterioration of the screen quality.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of the vicinity of a neck portion of a cathode ray tube showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing a structure of a shock absorbing means of an electron gun in FIG. 1, and FIG. FIG. 4 is a schematic view showing another embodiment of the shock absorbing means according to FIG. 4, FIG. 4 is a schematic sectional view showing the structure of a conventional cathode ray tube, and FIG. 5 is a schematic sectional view near the neck portion of the cathode ray tube in FIG. FIG. 6 is a schematic view showing a supported state of the convergence cup of the cathode ray tube in FIG. 1 ... Phosphor 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 ... Accelerating electrode 11 ... Focusing electrode, 12 ... Final accelerating electrode 13 ... Convergence cup 14 ... Support structure, 15 ... Insulating support 16 ... Inner lead, 17 ... Stem pin 18 ... Valve spacer 19 ...... Shock absorbing means 20a, 20b ...... Connection structure 21 ...... Space

Claims (2)

[Claims] 1. A panel portion having a phosphor screen formed on an inner surface thereof, and a neck portion having an electron gun facing the phosphor surface mounted therein.
At least a funnel portion that joins the panel portion and the neck portion and has an inner conductive film formed on an inner surface thereof, and the cathode at which the electron gun emits at least an electron beam,
The electron for controlling, accelerating and focusing the electron beam, a final accelerating electrode for accelerating the electron beam toward the phosphor screen by applying an accelerating high voltage, and a convergence cup having the same potential as the final accelerating electrode The cathode side end of the electron gun is connected to a stem pin at the end of the neck portion through an inner lead, and the phosphor screen side end is the phosphor screen side of the convergence cup. In a cathode ray tube that is in contact with the internal conductive film via a valve spacer provided at the tip, an electrode except the convergence cup of the electron gun is supported by an insulating support through a support structure protruding outside the electrode. A connection structure having a fixed side portion that is fixed and is welded to the convergence cup is provided on the support structure of the final acceleration electrode. A cathode ray tube, wherein the zen cup is elastically held while maintaining a space between the cathode side and the final accelerating electrode. 2. The connection structure has a fixed side portion formed by bending a portion extending from the support structure toward the fluorescent surface side on the fluorescent surface side, and the fixed side portion is welded at an end portion to a convergence cup and bent. The cathode ray tube according to claim 1, wherein the vicinity of the portion is not welded and a gap is provided between the convergence cup and the convergence cup.