JPH08129977A - Getter spring and cathode-ray tube using the same - Google Patents

Abstract

PURPOSE: To provide a getter spring having constitution by which influence of heat exerted on a tube body of a cathode-ray tube, that is, on funnel glass is reduced in a getter flash process when the cathode-ray tube is manufactured, and the cathode-ray tube using this. CONSTITUTION: In a getter spring and a cathode-ray tube using this, connection between the getter spring 16 and a capacitor 15 housing a getter is fixed at places by welding connection, and a small semisphere or a projection is arranged on the getter spring 16 in the other place, and is slidably contacted at a point with it, and residual parts are performed in a mutually separated condition. Therefore, a thermal expansion difference between the getter spring 16 and a container 15 is made absorbable, and heat conduction to the getter spring 16 is reduced at getter flash time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a getter spring and a cathode ray tube using the getter spring.

[0002]

2. Description of the Related Art Cathode ray tubes are widely used in television receivers, display devices of computer systems and the like.
The inside of the cathode ray tube is maintained in a high vacuum state, and this high degree of vacuum is mainly achieved by a getter flash process in manufacturing the cathode ray tube.

In the getter flash process, after the evacuation process for making the inside of the tube (funnel glass) at the time of manufacturing the cathode ray tube into a vacuum, barium Ba previously placed inside the cathode ray tube is used.
The getter, which is a metal mainly composed of, is heated by high frequency from the outside of the tube body (the getter generates an eddy current to generate heat).
Then, when the evaporated metal is condensed, the residual gas inside the pipe body is absorbed to make the pipe body have a higher vacuum. Further, this evaporated metal also has a function of catching dust and the like remaining in the tube body and depositing it on the inner peripheral surface of the funnel.

The getter spring has one end fixed to an electron gun incorporated in a cathode ray tube and extends along the inner inclined surface of the funnel, and a container having the getter placed (accommodated) at the tip thereof. It functions as a support to support.

FIG. 8 shows a conventionally used getter spring 81, FIG. 9 shows a conventionally used container 15 and a state in which this container is supported by the getter spring 81, and FIG. 10 shows a container in a cathode ray tube. The state where the getter spring 81 supporting the is attached is shown.

These getter springs 81 have a certain strength and are excellent in heat resistance and conductivity, such as S.
Made from US 304 (spring material). Further, the container 15 is made of a material, such as SUS304, which can endure high temperature during getter flash.

In FIG. 8, FIG. 8A is a front view of the conventional getter spring 81 before shaping. As shown in FIG. 8A, the getter spring 81 has a cross-shaped outer shape as viewed in the figure, in which the longitudinal portions 81a and 81b in the left-right direction are about 118 mm, and the short-side portion 81c in the up-down direction is about 22 mm. . Longitudinal portions 81a and 81b extending in the left-right direction are located at a place 82
Then, it is cut by a wire and is spliced by an insulator 21 as described later.

The longitudinal portion 8 of the getter spring 81
As shown in the side view of FIG. 8B, 1a is gradually bent and shaped so as to follow the inclined surface of the funnel portion when installed inside the funnel body of the cathode ray tube (see FIG. 10). Multiple bends, for example I, II, III, IV, as shown in the figure
Angles of 10 °, 20 °, 20 at 6 locations of V and VI
It is bent and shaped at °, 20 °, 15 °, and 12 °, respectively.

As shown in detail in FIG. 8C, the upper end (shown by the broken line circle C) of the long portion 81a forms a spoon-shaped curved portion 83, and the convex side of this curved portion 83 is shown in FIG.
The inner conductive film 8 inside the cathode ray tube funnel as shown in FIG.
To contact. The shape of the curved portion 83 is to ensure that the convex side is in contact with the internal conductive film and that the internal conductive film is not damaged.

As shown in detail in FIG. 8D, both ends of the short-side portion 81c of the cross-shaped getter spring 81 extending in the vertical direction are formed with curved portions 84a and 84b, respectively, and convex portions of these curved portions are formed. Also surely contacts the inner conductive film 8.

On the other hand, the container 15 has a donut-shaped outer shape as shown in FIGS.
A groove (recess) 91 for mounting (or accommodating) is formed. Container 15 in which getter 91 is placed (or housed)
Is shown in FIG. 9B.

A short portion 81c of the getter spring 81
The two curved portions 84a and 84b of the getter 92 are
Is engaged with the bottom surface 15a of the container 15 placed (or accommodated), and the container 1 is attached at the two engaging points 94a and 94b.
5 are welded and connected (see FIG. 9C). Therefore, the getter spring 81, the insulator 21, and the assembly of the container 15 are as shown in FIG. 9D.

FIG. 10 is a schematic view showing a state in which this assembly is incorporated in a cathode ray tube. One end of the getter spring 81 is connected to the inner deflection electrode plate 3b of the electron gun, and the getter spring 81 extends along the inclined surface on the inner side of the funnel portion via the insulating plate 21 while being spaced apart from the convex surface of the tip curved portion. Also, only the convex side of each curved portion at both ends of the short side portion is in contact with the internal conductive film 8 of the funnel portion.

Since the getter spring 81 is made of a spring material, it has elasticity, and since the entire angle formed by the plurality of bent portions is larger than the angle of the inclined surface of the funnel portion, the getter spring 81, the insulator 21
When the assembly of the container 15 and the assembly of the container 15 are attached to the inner deflection electrode plate 3b of the electron gun of the cathode ray tube, only the convex side of each curved portion at the tip of the getter spring and both ends of the short side contact the inner conductive film 8 and the other portions. Is in a state of floating along the funnel glass 1 without making contact.

The getter spring 81 attached to the electron gun 2 of the cathode ray tube is relayed by the insulator 21 when the electron gun 2 is used as a display device (in this conventional example, the inner changing electrode is used). This is because if the plate 3b) is not electrically insulated, it may be discharged, so that this is insulated so that the potential of the electron gun 2 does not affect the electron beam through the getter spring 81.

Further, a part of the getter spring 81 is brought into electrical contact with the inner conductive film 8 of the funnel portion of the cathode ray tube because the getter spring 81 is electrically floated in the cathode ray tube. Is charged and affects the traveling direction of the electron beam. Therefore, a part of the getter spring 81 is brought into electrical contact with the inner conductive film 8 so that the electron beam scans normally.

The getter 92 supported by the getter spring 81 is arranged in the cathode ray tube and is heated by high frequency from the outside of the tube body in the getter flash step in manufacturing the cathode ray tube.

[0018]

In the getter flash process, the getter vaporized by high-frequency heating has a high temperature, and due to this high heat, cracks occur from the contact portion of the funnel glass 1 with which the getter spring 81 is in contact ( There is a risk of cracks.

Specifically, in the getter flash process, the getter 92 is heated to a high temperature by high frequency, and reaches about 1200 ° C. when measured by the container 15 in which the getter is placed (or housed). When this container 15 directly contacts the funnel glass 1 of the tubular body, a crack is generated from the contact portion of the funnel glass 1 due to the high heat.
In order to prevent this, the container 15 is floated so as not to directly contact the funnel glass 1 as described above, and is further devised so that only the tip end portion 83 of the getter spring 81 and both end portions 84a and 84b of the short side portion contact. ing.

However, even with such a measure, the temperature of the portion of the tube body of the getter spring 81 in contact with the funnel glass 1 reaches an average value of about 740 ° C.

On the other hand, from the viewpoint of the heat resistance strength of the funnel glass 1, it has been confirmed that the funnel glass 1 may be cracked when the temperature of the contact portion of the getter spring 81 exceeds about 750 °. There is.
Therefore, in the getter flash process of the cathode ray tube using the conventional getter spring 81, the temperature margin (margin) is only about 10 ° C. Actually, the difference in the specifications of the cathode ray tube, the getter amount, and the heating time. In some cases, the funnel glass 1 was cracked due to variations in the manufacturing position of the getter spring 81 and the like, and changes in factors such as the ambient temperature.

Further, the getter spring 81 and the container 15 are provided at two ends 93a and 93b of the short portion 81c.
Because of the welded connection in FIG. 9C, a difference in thermal expansion due to a temperature difference occurs between the getter spring 81 and the container 15 in the getter flash process, causing the getter spring 81 to be deformed or significantly. In some cases, the welded part may come off.

Therefore, an object of the present invention is to provide a getter spring 81 and a getter spring 81 having a structure which is less affected by heat applied to the tube body of the cathode ray tube, that is, the funnel glass 1 in the getter flash process in manufacturing the cathode ray tube. It is to provide the used cathode ray tube.

A further object of the present invention is to solve the above-mentioned problem of cracking of the funnel glass 1 without making a significant change to the getter spring 81 and the cathode ray tube that have been used conventionally.

A further object of the present invention is to reduce the cost as compared with the prior art in the manufacture of the getter spring 81, the mounting of the container 15 on the getter spring, the arrangement of the getter spring with respect to the cathode ray tube, and the like.

[0026]

A getter spring 16 according to the present invention is a getter spring 16 that supports a container 15 on which a getter is placed, as shown in FIGS. 2 and 4, for example. The connection with is made by fixing at one location 41 and making point contact at the other location to reduce heat conduction to the getter spring 16 during getter flash.

Further, the getter spring 1 according to the present invention.
In addition to the structure of the getter spring 16 described above, the connection 6 between the getter spring 16 and the container 15 is fixed by welding at one point 41 as shown in FIGS. Small hemispheres or protrusions 23 are provided on the getter spring 16 at one point to slidably contact one point, and the remaining portions are separated from each other to absorb the difference in thermal expansion between the getter spring 16 and the container 15. It also enables the heat transfer to the getter spring during getter flush.

Further, the getter spring 1 according to the present invention.
Reference numeral 6 denotes a getter spring 16 arranged inside the cathode ray tube and supporting a container 15 containing a getter, as shown in FIG.
Is made of an elastic material and is a funnel glass for a cathode ray tube 1.
Is entirely shaped to have an angle larger than the inclined surface of the funnel glass 1, one end of which is fixed to the electron gun 2 by welding connection and extends along the inclined surface of the funnel glass 1 while being spaced apart, and the other end of which is a convex portion 24. To make a point contact with the funnel glass 1,
The getter spring 16 and the container 15 are fixed in the funnel glass 1 by connecting the convex portion 2 at the other end.
4, the getter spring is provided with a small hemisphere or a projection 23 at a relatively close position 41 by welding connection and is relatively slidably contacted at a single point so that the heat between the getter spring 16 and the container 15 is increased. The expansion difference can be absorbed and the heat conduction to the funnel glass 1 at the time of getter flash is reduced.

Further, as shown in FIG. 1, the cathode ray tube according to the present invention is a cathode ray tube in which a getter used at the time of getter flash is arranged inside the tube body 1 and has been described above for supporting the getter. One of the getter springs 16 is provided.

[0030]

In the getter spring according to the present invention, as shown in FIGS. 2 and 4, for example, the getter spring 16 and the container 15 are connected to each other by fixing them at one place 41 and making point contact at another place. ing. Therefore, the heat conduction from the container 15 which has become high temperature during the getter flush to the getter spring 16 is different from the connection where the getter spring 16 and the container 15 are in full contact with each other, and the heat conduction path is a fixed point. Since it is limited to the contact point, it is significantly reduced.

Further, in the getter spring according to the present invention, as shown in FIG. 2 and FIG. 4, for example, in addition to the above-mentioned structure of the getter spring, the getter spring 16 and the container 15 are connected at one location 41. The getter spring 16 is fixed by welding, and the getter spring 16 is provided with a small hemisphere or a protrusion 23 at other points to slidably contact one point, and the remaining portions are separated from each other.

Therefore, in addition to the above-mentioned effects, there is only one welding point and the other is slidable, that is, free,
Getter spring 16 and container 15 generated during this period
It is possible to absorb the difference in thermal expansion caused by the temperature difference between the getter spring 16 and the welded portion 4
1 never comes off.

Further, the getter spring 1 according to the present invention.
For example, as shown in FIG. 1, 6 is made of an elastic material, is generally shaped to have an angle larger than the inclined surface of the funnel glass 1 of the cathode ray tube, and one end thereof is fixed to the electron gun 2 by welding connection. It extends along the inclined surface of the funnel glass 1 while being spaced apart, and the other end is provided with a convex portion 24 and is in point contact with the funnel glass 1 and is fixed in the funnel glass 1, and the getter spring 16 and the container 15 are fixed. The connection is fixed by welding connection at a location 41 relatively far from the convex portion 24 at the other end, and at a location relatively close to the getter spring, a small hemisphere or projection 23 is provided to slidably make one-point contact. .

Therefore, the heat of the getter, which has become hot during the getter flash, is generated in the heat conduction path between the fixed portion 41 and the point contact portion as compared with the connection in which the getter spring 16 and the container 15 are in full contact with each other. Because it is very limited, heat transfer to the getter spring 16 is reduced. Further, only one welding portion is provided and the other is slidable, that is, free, and it is possible to absorb the difference in thermal expansion caused by the temperature difference between the getter spring 16 and the container 15 generated during this time. There is no deformation of 16 or disengagement of the welding point 41.
Further, since the getter spring 16 extends along the inclined surface of the funnel glass 1 without making contact, and the convex portion 24 at the other end makes point contact with the funnel glass 1, the heat of the getter spring 16 is applied to the funnel glass 1. It is only this point contact point that conducts heat to the funnel glass 1
Has very little effect on Further, in comparison with the conventional getter spring, in which the container 15 is welded at the curved portions at both ends of the short side portion, and the funnel glass 1 is contacted at the three curved convex portion convex sides extremely close to the welded portion, The welded portion 41 between the getter spring 16 and the container 15 is relatively far from the tip curved portion 24 of the getter spring 16 that comes into contact with the funnel glass 1. Therefore, the heat generated in the container 15 is not conducted. The path is relatively long and difficult to reach (see Figure 4C).

Further, as shown in FIG. 1, the cathode ray tube according to the present invention is a cathode ray tube in which a getter used at the time of getter flashing is arranged inside the tube body 1 and has been described above for supporting the getter. One of the getter springs 16 is provided.

Therefore, at the time of getter flash in manufacturing the cathode ray tube, the heat generated by the getter is difficult to be transferred to the funnel glass 1 of the cathode ray tube, so that the funnel glass 1 is not damaged and the quality of the cathode ray tube can be improved.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a getter spring and a cathode ray tube using the same according to the present invention will be described below with reference to the accompanying drawings.

First, the outline of the cathode ray tube and getter spring according to the embodiment will be briefly described. FIG. 1 is a sectional view of a main part of a color cathode ray tube in the case of, for example, a Trinitron picture tube according to this embodiment. The structure of the cathode ray tube is roughly divided into a panel portion, a funnel portion (funnel-shaped portion) and a neck portion. The funnel and neck are
Welded at the neck weld. The funnel portion and the neck portion are collectively referred to as a funnel.

In the figure, reference numeral 1 is a tubular body (also referred to as "funnel glass"), 2 is an electron gun 2 arranged in the neck portion, and the electron gun 2 is a sequentially arranged first grid G.
It comprises a first grid G2, a third grid G3, a fourth grid G4, a fifth grid G5 and a convergence plate (deflection electrode plate) 3. Here typically
The first grid G1 and the second grid G2 constitute a cathode lens, that is, an object point forming region, and the second grid G2 and the third grid G3 are prefocus lenses (previous lens).
And the third grid G3, the fourth grid G4, and the fifth grid G5 form a main focusing lens (main lens).

In the case of a Trinitron picture tube, the electron gun 2 built in the neck portion is of a single electron gun type and has three cathodes K.
The electron beams emitted from R, KG and KB are separated after intersecting at the center of the main focusing lens, but they are electrostatically or electromagnetically converged (concentrated), and an aperture grill (grating) which is a color selection mechanism. ) (Reference numeral 62 in FIG. 5C)
(Refer to FIG. 3) and concentrate it again at one point and apply it to the phosphor screen 17.

Many electron lens systems have been devised as the structure of the electron lens. For example, in the unipotential focus (UPF) of a single main lens type electron lens, the third grid G3 and the fifth grid G5 are, for example, A leaf spring made of a C-shaped metal plate that is electrically connected by the conductive wire 5 so that the anode voltage (high voltage) HV is connected from the anode button (not shown) to the outer conductor 12a of the coaxial cable 12 and the outer conductor. An internal conductive film 8 via
It is applied through the conductive contact 15 which is in contact with the inner conductive film.

For the fourth grid G4, from the terminal pin 6 penetrating the stem 1c at the end of the neck portion to the conductive wire 7
A relatively low voltage of 0 to several hundreds of V is supplied via.
Thus, the third grid G3, the fourth grid G4 and the fifth grid G3
The grid G5 constitutes a UPF type main focusing lens.

The convergence means 3 comprises inner deflecting electrode plates 3a and 3b facing each other and outer deflecting electrode plates 3c and 3d arranged outside them. Inner deflection electrode plate 3a,
The anode voltage HV is supplied to 3b from the fifth grid G5 mechanically and electrically connected thereto.
A convergence voltage CV which is lower than the anode voltage by several hundreds V is applied to the outer deflection electrode plates 3c and 3d from an anode button (not shown) through the center conductor 12b of the coaxial cable 12.

Next, the relationship between the cathode ray tube and the getter spring will be described. In such a cathode ray tube, one end of a getter spring 16 made of a strip-shaped metal plate is attached to one of the inner deflection electrode plates 3a and 3b (for example, 3b) of the convergence means 3 of the electron gun 2. A container 15 in which a getter material is placed (or housed) is attached near the other end on the opposite side of the getter spring 16. The getter spring 16 is spliced via an insulator 21. The getter spring 16 extends from the inclined surface of the funnel glass 1 along the inclined surface at a distance of, for example, about 2 [mm], and the other end thereof extends a little longer than the mounting position of the container 15, and the funnel of the cathode ray tube. It is in contact with the inner conductive film 8 coated on the inner side surface (see FIG. 4C).

Next, the description of the getter spring and the container will be continued. The getter spring 16 is formed by shaping a strip-shaped metal such as stainless SUS 304 (spring material) like the conventional getter spring 16. While the conventional getter spring 16 has a cross-shaped outer shape (FIG. 8A), as shown in FIG. 2A, the getter spring 16 according to this embodiment has a generally elongated rectangular shape (strip shape). There is no short part extending in the left-right direction of the letter shape, and it is simplified. The container 15 fixed to the getter spring 16 is the same as the conventional container 15 (see FIGS. 9A and 9B) and is a container having a donut-shaped recess (groove), and the getter 92 is placed in the recess. (Or contained).

The external dimensions of the getter spring 16, the container 15 and the insulator 21 used in this embodiment are shown below (unit: [mm]). However, these are merely examples, and it goes without saying that they may be changed according to the specifications, size, etc. of the cathode ray tube. Getter Spring: Length 114.2 x Width 4 x Thickness 0.
25 SUS304 (spring material) Container 15: outer diameter 21φ x inner diameter 13φ x height 2 SUS304 material Insulation material: length 15 x width 4 x thickness 1.8 Alumina ceramic material

The getter spring 16 is cut at a portion 27 near one end which is fixed to the inner deflection electrode plate 3 by welding or the like and is spliced with an insulator 21 like the conventional getter spring 16 so that the remaining portion is not formed. It is electrically isolated.

As the insulator 21, for example, the alumina insulator 21 is used as in the conventional case. As shown in FIG. 3B, the insulator 21 includes hollow rivets 22a and 22b.
Through holes 23a, 23b into which are inserted, and
Conical protrusions 24a and 24b are provided so as to project from one main surface located outside each through hole.

On the other hand, 2 which constitutes the getter spring 16
An insulator 21 is provided at each end of the two members 16a and 16b.
The holes 25a and 25b corresponding to the through holes 23a and 23b are provided, and the engagement holes 26a and 26b that fit into the protrusions 24a and 24b of the insulator 21 are provided. As shown in FIG. 3A, the end portions of the getter springs 16a and 16b are arranged on the main surface of the insulator 21 with a distance D therebetween. At this time, the protrusions 24a, 24 of the insulator 21
b is the engagement hole 26 of each getter spring 16a, 16b
a and 26b, and the through holes 23a and 23b of the insulator 21 are respectively fitted to the getter springs 16a and 1a.
Positioning is performed so as to coincide with the holes 25a and 25b of 6b.

In this state, as shown in FIG.
From the back surface of 1, the hollow rivets 22a, 22b made of aluminum, for example, are inserted into the through holes 23a, 23b of the insulator 21 and the holes 25a, 25b of the getter springs 16a, 16b.
Then, the rivets 22a and 22b are pressed together from the getter spring 16 side to be integrated.

According to this centering method, when the two getter springs 16a and 16b are to be centered, the insulator 21 and the getter springs 16a and 16b are caulked by the rivets 22a and 22b, and the protrusions 24a and 2b.
By fitting 4b into the engagement holes 26a, 26b, the getter springs 16a, 16b and the insulator 21 can be reliably fixed with one rivet 22a, 22b, respectively, and rotation between them can be prevented. In addition, since the protrusions 24a and 24b of the insulator 21 have a conical shape, the getter springs 16a and 16b are firmly fitted even if there is some error in the dimensions of the engagement holes 26a and 26b, and play is generated. Absent.

Getter spring 16a on insulator 21
The distance D between 16 and 16b is preferably as narrow as possible in order to prevent the surface of the insulator 21 from being charged, but a certain dimension or more is necessary to prevent creeping discharge. [Mm]. However, if the operating voltage is relatively low due to the difference in the specifications of the cathode ray tube, it can be further narrowed. FIG. 3C shows a distance D [mm] between both getter springs in such a getter spring 16,
It is a characteristic view showing the relationship with the discharge start voltage [kV] at that interval, and an appropriate interval D is determined based on this interval-discharge start voltage characteristic.

It is preferable that the mounting position of the insulator 21 is as far as possible from the container 15 in order to avoid the influence of the getter scattering during the getter flash.
For this reason, in this embodiment, the getter spring 16 is cut at a location 27 near the inner deflection electrode plate 3 of the electron gun 2 to cut off the insulator 2.
It is relayed in 1.

After the getter springs 16a and 16b are spliced with the insulator 21, the getter springs 16b
One end of is fixed to one of the inner deflection electrode plates 3a and 3b of the electron gun 2 by welding or the like.

The remaining portion of the getter spring 16 connected to the insulator 21 extends along the inclined surface of the funnel portion of the tube 1 when installed inside the funnel portion of the cathode ray tube. For example, as shown in FIG. 2B, a plurality of bent portions I, II, III, IV, V, VI and VII are sequentially arranged at an angle of 10
°, 20 °, 20 °, 20 °, 15 °, 10 ° and 3 °
Each is bent.

If desired, as shown in FIGS. 2A and 4A, a wide portion 21 for connecting the container 15 by welding or the like is provided over a length of about 4 mm from a position between the bent portions VI and VII. It may be partially formed. For example, the wide portion has a width of about 5.5 [mm], while the other portion has a width of about 4 [mm]. If desired, a recess or groove 22 (as viewed from the mounting surface of the container 15) extending in the lengthwise direction as shown in the sectional view of FIG. 2C is provided from a position slightly before the wide portion 21 to the entire wide portion. Then, the bending strength of the getter spring 16 in this portion may be improved.

A small hemisphere (or projection) 23 having a radius of about 1 mm, for example, is formed at a position slightly ahead of the bent portion VII so as to project to the container 15 mounting surface. This small hemisphere 23
Can be formed by pressing an appropriate protrusion from the back surface at the same time as punching out the outer shape of the getter spring 16. The space S between the small hemisphere 23 and the wide portion 21
(See FIG. 4A) is approximately equal to the average value of the outer and inner diameters of the donut-shaped container 15. For this reason,
As shown in B, the bottom 15a of the container 15 is
When positioned in alignment with 1, the apex of the small hemisphere 23 comes into contact with the bottom surface portion 15a of the container 15, and the other portions are in contact with each other and are separated from each other. Getter spring 16
By placing the container 15 and the container 15 in such a positional relationship, the wide portions 21 of the getter springs 16 are located substantially at the center in the length direction and close to the end portions in the width direction (2 points) 41a, 4a.
At 1b, they are fixed by, for example, welding (see FIG. 4A).
Bottom part 15a of container 15 and getter spring 16
The small hemisphere 23 is in slidable contact. Therefore,
Even if there is a difference in thermal expansion between the two, the getter spring 16 is not deformed and no extra stress is generated.

In comparison with the conventional getter spring, as shown in FIG. 4C, the other end of the getter spring 16 extends further ahead of the container 15 attachment point, and a curved portion 24 is formed at the tip of the getter spring 16. The curved portion 24 is in contact with the inner conductive film 8 covering the inner surface of the cathode ray tube at one point. The length of the conventional getter spring 16 is about 118 [m
m], the total length of the getter spring 16 according to the present invention is increased by about 8 mm, and the number of bent portions is increased by one.
The location is set to be slightly larger and the bending angle is slightly increased so that even one point contact can be securely fixed in the cathode ray tube.

Next, the manufacturing method and mounting will be described. The getter spring 16 has, for example, a thickness of 0.25.
[Mm] SUS 304 (spring material) is formed by punching and shaping. If desired, it is desirable to shape the small hemisphere 23, the curved portion 24, and, if desired, the recessed portion 22 extending in the lengthwise direction at the same time as this punching, in order to improve the work efficiency and reduce the cost.

Further, as shown in FIG. 5, the conventional getter spring 81 has a cross shape (FIG. 5B), whereas the getter spring 16 according to this embodiment has no short side portion. By adopting the substantially rectangular shape (rectangular shape) (Fig. 5A), there is no waste in terms of material picking, it is possible to manufacture with about 1/3 of the material, and it is possible to reduce the cost in terms of material cost. . In addition, in order to improve the material removal also in the conventional getter spring, FIG.
It was also taken diagonally as shown in A. However, in this case, the getter spring is twisted by the heat of the getter flash. However, since the getter spring according to the present embodiment removes material perpendicularly to the material as shown in FIG. 5A, such a twist phenomenon does not occur.

An outline of how the getter spring 16 is attached to the cathode ray tube is shown in FIGS. 6 and 7. 1) A phosphor slurry is applied and developed on the inner surface of the panel 61 (step 711 in FIG. 7), and an intermediate film is applied (step 71).
2) A reflective film of aluminum thin film is deposited by a metal back process (process 713). Aperture grille 62
(Step 714). 2) The separately manufactured funnel 63 is combined with this panel 61 (step 715), and the frit (solder glass) on the joint surface is melted, crystallized, and fixed (step 716). 3) Attach a getter spring to the electron gun (Step 74
1) After that, the electron gun 2 is installed on the neck portion 64, the stem portion and the neck portion are sealed (step 717), and the air inside the tube is exhausted to a vacuum (step 718). 4) After this evacuation step, in the getter flash step, the inside of the tube is further evacuated (step 719). 5) Aging process (process 720), inspection process, etc. are completed.

In the above getter flash process,
The getter in the container 15 is heated from outside the funnel by a high-frequency heating device 41 to evaporate (FIG. 4C), and barium (Ba) is vapor-deposited on the inner surface of the tube. In the aging process of the getter-flashed cathode ray tube, when the heater is ignited and a voltage is applied to the first grid G1 and the second grid G2 at the same time a current is made to flow to the cathode, the residual gas in the tube is easily removed. It is absorbed by the getter and becomes a high vacuum.

Next, this embodiment will be described in terms of functions and functions. The point of this embodiment is to reduce the heat transfer to the funnel glass 1 by the heat generated by the getter during the getter flash.

First, as shown in FIG. 4B, the contact surface between the container 15 having the getter and the getter spring 16 forms a heat barrier. That is, the getter spring 16 is welded at one portion 41 on the bottom surface of the container in the wide portion and at the tip of the small hemisphere 23.
The bottom surface of the container 5 is in point contact with the bottom surface of the container 5, and the other parts are spaced apart from each other to support the container 15. By adopting this configuration, in the getter flash process, the getter placed in the container 15 is heated by high frequency from the outside of the pipe body (see FIG. 4C), and even if the getter reaches a high temperature of about 1200 ° C., for example.
A space that serves as a heat barrier occupies a space between the two other than the welded portion and the point contact portion. Since this space is in a vacuum state after the evacuation process, air convection does not occur and heat is not transmitted. Furthermore, since the contact points are limited to the welding point and the point contact point,
Heat transfer can be significantly reduced. In particular, since the point contact area has a very small area, a large amount of heat is not rapidly transferred.

Next, as shown in FIG. 4C, the length of the heat conduction path is devised. That is, the welded portion 41, to which a relatively large amount of heat is transmitted, is a considerable distance to reach the funnel glass 1 of the tube body 1 by thermally conducting the getter spring 16 in the lengthwise direction (contacting the curved portion 24 at the tip). Because there is
It can be expected that the temperature will drop considerably. Further, the heat conduction path for conducting heat to the getter spring 16 through the small hemisphere 23 which is in point contact with the bottom surface of the container 15, which is another heat conduction path, has a relatively short heat conduction path, but has a contact area of point contact. Since it is extremely small, it is difficult for a large amount of heat to be rapidly conducted.

Further, the contact area between the getter spring 16 and the funnel glass 1 is limited because the contact surface at the tip of the getter spring has a convex shape 24 to make point contact.

The amount of heat that is directly radiated (radiated) from the getter 92 and the container 15 is negligible as compared with the amount of heat conducted through the getter spring 16 described above.

The effect of the embodiment will be described. When the getter spring 16 according to the present embodiment is used, the temperature of the contact surface between the tip curved portion 24 of the getter spring 16 and the funnel glass 1 during the getter flash is actually measured. Was about 640 ° C. When the conventional getter spring 81 is used, the temperature of the contact surface is about 740 ° C. on average, but it is about 100 ° C. lower. Heat-resistant temperature of funnel glass 1 is about 750 ° C
Therefore, in the prior art, the average value is only 10 ° C.
Although there was only a temperature margin of 10 ° C., the temperature margin is expanded to 110 ° C. by using the getter spring 16 according to the present embodiment. Therefore, it is possible to provide a cathode ray tube in which cracks do not occur in the funnel glass 1 in the getter flash process even in consideration of differences in specifications of the cathode ray tube, variations in manufacturing, and the like.

Further, when the getter spring 16 according to the present embodiment is used, the getter spring 16 and the container 15 are connected by welding at one place, and the other one is slidably supported by point contact. Therefore, the getter 92 is heated during the getter flash process, so that the container 15
Even when the temperature of the getter spring 16 was relatively higher than that of the getter spring 16, the getter spring 16 was not deformed and the welded part was not detached due to the difference in thermal expansion between the container 15 and the getter spring 16.

Furthermore, the combination of the cathode ray tube according to the present embodiment and the getter spring 16 used for this is as follows.
The problem of cracking of the funnel glass 1 of the prior art is solved by slightly changing the outer shape of the getter spring 16 without making a significant change to the combination of the cathode ray tube and the getter spring 16 of the prior art. It has become possible.

Further, in the getter spring 16 according to the present embodiment, the portion extending laterally from the cross shape is removed from the getter spring 16 of the prior art, so that in terms of material taking, about 1/3 of the material can be obtained. It is possible to make it at low cost in terms of material cost (see Fig. 5).

Further, the getter spring 16 according to the present embodiment is connected to the container 15 at the same time by two points at the same time, if necessary (see FIG. 4A).
In comparison with the conventional case where two separate welding operations were required (see FIG. 9C), the cost could be reduced in terms of the work cost. It should be noted that the small hemisphere 23 forming the point contact can be formed at the same time when the material is stamped and formed.

Finally, a modification of this embodiment will be described. As described above, the getter spring 16 according to the present invention
Also, an embodiment of the cathode ray tube using the same has been described. However, the invention is not limited to the embodiments described above. Of course, those skilled in the art can make various modifications within the technical scope of the present invention.

For example, in the above-mentioned embodiments, a particular type of cathode ray tube has been described, but the present invention is not limited to this, and is applied to all types of cathode ray tubes that utilize getter flash to increase the degree of vacuum. To be done.

Further, in the above embodiment, one end of the getter spring 16 is fixed to the inner deflection electrode plate 3b of the electron gun 2. However, the present invention is not limited to this, and it suffices if the getter spring 16 is fixed in the cathode ray tube. For example, the getter spring 16 is fixed to an appropriate arbitrary position of the electron gun 2 at a position where the electron beam is less affected. Just go.

Furthermore, in the above-described embodiment, the getter spring 16 and the container 15 are connected at one point (2
Weld connection (of the point) and single point contact at another location via a small hemisphere or protrusion 23 formed on the getter spring 16. However, the present invention suffices to reduce the heat conduction between the two, and is not limited to this. Regarding the welding connection, the wide portion 21 of the getter spring 16 described above is provided sufficiently large so that it can be stably fixed even if it is 1-point welded. On the contrary, if necessary, 3 or more points may be welded.

Further, the one-point contact via the small hemisphere or the projection 23 formed on the getter spring 16 is not limited to this. In the present invention, it is sufficient that the point contact can be achieved, and the point contact can be achieved by forming one or both of the getter spring 16 and the container 15 into an appropriate shape. For example, instead of forming these small hemispheres or protrusions 23 on the getter spring 16,
Conversely, the getter spring 16 may be provided on the bottom surface 15a of the container 15 and may be flat. Alternatively, the contact surface is point-contacted by providing one side with a ridge-shaped protrusion extending for an appropriate length and the other side provided with a protrusion extending for an appropriate length in a direction orthogonal thereto. In addition, although one-point contact is illustrated in the embodiment, the number of contact points is not limited to one point. In the present invention, point contact is sufficient, and two or more point contacts may be used.

Further, the portion of the tip of the getter spring 16 that contacts the funnel glass 1 is exemplified by the spoon-shaped curved portion 24, but the invention is not limited to this.
The present invention is sufficient if the contact area is small, and therefore, any shape devised to reduce the contact area is conceivable.

The various modifications described above are, when the present invention is carried out, the heat resistant temperature of the funnel glass 1 of the particular cathode ray tube, the temperature of the contact portion of the getter spring at the time of getter flash, the temperature margin defined in the specification, It can be arbitrarily selected in consideration of the manufacturing price and the like.

[0080]

The cathode ray tube according to the present invention has the advantage of improving the quality of the cathode ray tube because it adopts the structure of the getter spring, which has less heat conduction during getter flash.

Further, according to the present invention, it is possible to avoid the occurrence of cracks in the funnel glass without making a great change to the conventional getter spring and the cathode ray tube, and it is possible to greatly improve the yield.

Further, according to the present invention, the cost can be reduced as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a getter spring and a cathode ray tube using the getter spring according to an embodiment of the present invention.

FIG. 2 is a diagram showing a getter spring according to an embodiment of the present invention. Here, FIG. 2A is a diagram for explaining the shape of the getter spring before shaping, FIG. 2B is a diagram for explaining the curved state of the getter spring after shaping, and FIG. FIG. 3 is a diagram showing a cross section taken along the line C ′ in FIG.
(D) is a diagram showing a cross section DD 'of a portion where a small hemisphere is formed.

FIG. 3 is a diagram illustrating a situation in which a getter spring according to an embodiment of the present invention is relayed by an insulator. here,
FIG. 3A is a perspective view of the bridge portion of the getter spring, FIG. 3B is a cross-sectional view of the bridge portion of the getter spring, and FIG. 3C is the relationship between the interval of the bridge portion and the discharge start voltage. It is a characteristic diagram showing.

FIG. 4 is a diagram illustrating a relationship between a getter spring and a container according to an embodiment of the present invention. Here, FIG.
4A is a view of the getter spring with the container attached, viewed from the back side, and FIG. 4B is a view of the getter spring with the container attached, viewed from the side.
(C) is a diagram showing a state in which a getter spring with a container is attached to a cathode ray tube.

FIG. 5 is a diagram illustrating material removal of a getter spring.

6A and 6B are views for explaining a getter spring according to an embodiment of the present invention and an assembly state of a cathode ray tube using the getter spring.

FIG. 7 is a flow chart illustrating a process of assembling a getter spring and a cathode ray tube using the getter spring according to an embodiment of the present invention.

FIG. 8 is a view showing a conventional getter spring. Here, FIG. 8A is a diagram showing the shape of the getter spring before shaping, FIG. 2B is a diagram illustrating the curved state of the getter spring after shaping, and FIG. It is a figure showing the detail of C, and Drawing 2 (D) is a figure showing the detail of dashed circle D by section DD '.

FIG. 9 is a diagram illustrating a relationship between a conventional getter spring and a container. Here, FIG. 9 (A) is a sectional view of the container, FIG. 9 (B) is a perspective view of the container including the getter, and FIG. 9 (C) is a view of the getter spring to which the container is attached, viewed from the back side. Is a perspective view,
FIG. 4D is a perspective view of the assembly of the container, the getter spring and the insulator.

FIG. 10 is a view showing a cross section of a cathode ray tube using a conventional getter spring.

[Explanation of symbols]

 1 tube body 2 electron gun 3 convergence means 3a, 3b inner deflection electrode plate 3c, 3d outer deflection electrode plate 8 inner conductive film 15 container 16 getter spring 21 wide portion 23 small hemisphere or protrusion 24 curved portion 91 getter

[Procedure amendment]

[Submission date] December 28, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

A short portion 81c of the getter spring 81
The two curved portions 84a and 84b of the getter 92 are
The engage the bottom surface 15a of the placing (or contain) the container 15, the container 1 in this engaging two places 9 3 a, 9 3 b
5 are welded and connected (see FIG. 9C). Therefore, the getter spring 81, the insulator 21, and the assembly of the container 15 are as shown in FIG. 9D.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction content]

The remaining portion of the getter spring 16 connected to the insulator 21 extends along the inclined surface of the funnel portion of the tube 1 when installed inside the funnel portion of the cathode ray tube. For example, as shown in FIG. 2B, a plurality of bent portions I, II, III, IV, V, VI and VII are sequentially formed,
Angle 10 °, 20 °, 20 °, 20 °, 15 °, 11 °
And bent at 3 °, respectively.

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

Claims (4)

[Claims] 1. A getter spring for supporting a container on which a getter is placed, wherein the getter spring and the container are connected to each other by fixing them at one place and making point contact at another place. A getter spring characterized by reducing heat conduction to the getter spring. 2. The getter spring according to claim 1, wherein a connection between the getter spring and the container is fixed by welding connection at one place, and a small hemisphere or a protrusion is provided at the getter spring at another place. Slidably contacting each other at one point, and the remaining parts are separated from each other to absorb the difference in thermal expansion between the getter spring and the container and to conduct heat to the getter spring during getter flush. Getter springs characterized by reduced. 3. A getter spring, which is disposed inside a cathode ray tube and supports a container containing a getter, wherein the getter spring is made of an elastic material, and is generally at an angle larger than the inclined surface of the funnel glass of the cathode ray tube. Shaped, and one end thereof is fixed to the electron gun by welding connection and extends while being separated along the inclined surface of the funnel glass, and the other end is provided with a convex portion to make point contact with the funnel glass, Fixed in the funnel glass, the getter spring and the container are fixed by welding connection at a location relatively far from the convex portion of the other end and a small hemisphere or projection at the location near the getter spring. To make it possible to absorb the difference in thermal expansion between the getter spring and the container. Also, the getter spring is characterized by reducing heat conduction to the funnel glass during getter flash. 4. A cathode ray tube in which a getter used for getter flashing is arranged inside a tube body, wherein the getter spring according to claim 1 is provided to support the getter. Is a cathode ray tube.