JPH0217906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a getter support structure loaded with getter material that is scattered within a small cathode ray tube and disposed within the neck of the small cathode ray tube.

BACKGROUND ART AND PROBLEMS Generally, in a cathode ray tube, a getter treatment is performed in which a getter material is scattered to adsorb residual gas in order to increase the degree of vacuum inside the tube. For this purpose, a getter support structure is provided within the cathode ray tube, which is loaded with a getter material and arranged therein. Such a getter support structure includes an elastic support arm extending from an electron gun structure etc. housed in the neck of the cathode ray tube, and a support arm that is attached to the support arm and comes into contact with the inner wall surface of the funnel of the cathode ray tube. A getter ring portion with a getter material loading portion is arranged. However, in the case of small-sized cathode ray tubes such as those used in viewfinders of imaging devices, the neck portion is relatively long due to its small diameter and the need for space for attaching the deflection means. By adopting a structure including a support arm extending from the electron gun structure in the neck part to the inner wall surface of the funnel part, the voltage applied to the electron gun structure is transmitted to the support arm part, and the electric field in the neck part is reduced. This is considered difficult as it may cause disturbances. For this reason, a getter support structure for small cathode ray tubes has been proposed, which is arranged within the neck of the cathode ray tube and separated from the electron gun structure.

FIGS. 1, 2, and 3 show an example of a conventionally proposed getter support structure disposed within the neck portion of a cathode ray tube, together with a small cathode ray tube in which the getter support structure is used. Here, the small cathode ray tube 1 includes a front panel part 3 on which a fluorescent surface 2 is formed, a funnel part 4 sealed to the front panel part 3, and a neck part 5 extending from the funnel part 4. An interior carbon coating 6 is provided on the inner wall surfaces of the section 4 and the neck section 5. It is connected. Further, a deflection yoke 8 and a focus ring magnet 9 are fitted around the outer periphery of the neck portion 5. Inside the neck portion 5, an electron gun assembly 10 is housed at one end thereof, and a getter support assembly 11 is arranged spaced apart from the electron gun assembly 10.

The getter support structure 11 includes a getter ring portion 1 as shown in enlarged views in FIGS. 2 and 3.
2, a support arm portion 13 and a support spring portion 14. The getter ring portion 12 is provided with an annular U-shaped groove 15, and a getter material is loaded into the annular U-shaped groove 15. Here, the support arm portion 13 and the support spring portion 14 are integrally formed of an elastic metal material, one end of the support arm portion 13 is spot welded to the getter ring portion 12, and the support arm portion 13 and the support spring portion are integrally formed. The portion 14 is reinforced with a series of ribs 16. In addition, the support spring portion 14
is formed into a cylindrical shape with a part cut out, and as shown in FIG. The getter support structure 1 is pressed against the inner wall surface of the neck portion 5.
1 is fixed at a predetermined position within the neck portion 5. The electron beam heading from the electron gun assembly 10 toward the fluorescent surface 2 passes through the center of the getter support structure 11, that is, the center of the support spring section 14 and the getter ring section 12.

When the getter material loaded in the annular U-shaped groove 15 provided in the getter ring portion 12 of the getter support structure 11 is scattered,
The getter ring part 12 is brought to an extremely high temperature by induction heating from the outside of the neck part 5, and as a result of this heating, the getter material scatters from the getter ring part 12 and adheres to the inner wall surface of the surrounding neck part 5. At this time, the presence of the support arm portion 13 reduces the heat transferred from the getter ring portion 12 to the support spring portion 14, and prevents the support spring portion 14 from being adversely affected by loss of elasticity due to heating. ing.

However, when such a getter support structure 11 is used, due to the elasticity of its support arm portion 13 and support spring portion 14, the center axis of the getter ring portion 12 of the getter support structure 11, as shown in FIG. Xg is shifted toward the support arm 13 side with respect to the tube axis Xt of the neck portion 5, and is easily fixed. Then, gettering part 1 like this
2, the electron beam traveling from the electron gun assembly 10 toward the phosphor surface 2 will collide with the getter ring part 12, causing the inconvenience of forming a shadow on the phosphor surface 2. 12 and the support arm portion 13 are brought into contact with the inner wall surface of the neck portion 5, and the heat generated by the heating of the getter ring portion 12 when the getter material is scattered is transferred to the neck portion 5.
is transmitted directly to a portion of the network 5.
There is a risk that a crack may occur. Furthermore, if the getter material is scattered while the center axis of the getter ring part 12 is misaligned, the getter material 17 is scattered in the getter ring part 12, as shown by the imaginary lines in FIGS.
It does not have a sufficient area to spread evenly around the area, and the residual gas sorption effect is reduced.

Purpose of the Invention In view of the above, the present invention has a configuration in which a getter ring portion into which a getter material is loaded is connected to a support spring portion via a support arm portion, and the getter ring portion is provided within a neck portion of a cathode ray tube. The spring is supported by being brought into pressure contact with the inner wall surface of the neck, and the position of the getter ring within the neck is regulated so that its center axis coincides with the tube axis of the neck. An object of the present invention is to provide a getter support structure for a cathode ray tube.

SUMMARY OF THE INVENTION A getter support structure according to the present invention includes a getter ring portion loaded with a getter material and disposed within the neck portion of a cathode ray tube, and a getter ring portion connected to the getter ring portion via a support arm portion, which is connected to the getter ring portion through a support arm portion of the neck portion of the cathode ray tube. a support spring portion that is pressed against the inner wall surface and supports the getter ring portion;
The support arm is provided with a spacer portion that contacts the inner wall surface of the neck portion of the cathode ray tube and restricts the position of the getter ring portion in the direction perpendicular to the tube axis within the neck portion of the cathode ray tube. configured. With this configuration, the gettering portion within the network portion of the cathode ray tube,
The center axis of the spacer portion is aligned with the tube axis of the neck portion, and as a result, the inconvenience caused by disposing the getter ring portion within the neck portion is avoided, and the scattering area of the getter material is sufficiently large. It is said that

Example Examples of the present invention will be described below.

4, 5, and 6 show an example of a getter support structure for a cathode ray tube according to the present invention. In this example, a getter ring part 2 has the same shape and function as the getter ring part 12, the support arm part 13, and the support spring part 14 in the getter support structure 11 shown in FIGS. 1 to 3.
The getter ring part 20 is provided with an annular U-shaped groove part 23, and a getter material is loaded into the annular U-shaped groove part 23. The support arm portion 21 and the support spring portion 22 are integrally formed of an elastic metal material, and are provided with a common rib 24 extending along the support arm portion 21 so that one end of the support arm portion 21 is connected to the getter ring portion 20. Spot welded. The support spring part 22 has a cutout part 25 so that a part of its outer surface is brought into pressure contact with the inner wall surface of the neck part when the support spring part 22 is disposed in the neck part of the cathode ray tube.
It is a cylindrical spring with
A bent surface 26 is formed at the end on the getter ring 20 side so as to allow smooth contact movement with the inner wall surface of the neck portion when the tube is inserted into the neck portion of the cathode ray tube. A spacer portion 27 having relatively small dimensions is provided on the outer surface of the support arm portion 21. In this example, the spacer portion 27
As shown in FIG. 7, the support arm 21 is made by molding a metal plate and has a protruding portion 28 along a rib 24 running along the support arm 21.
It is fixed by spot welding to the outer surface of the.
When the getter support structure is disposed in the neck of the cathode ray tube, the spacer portion 27 has its protruding portion 28 brought into contact with the inner wall surface of the neck, thereby adjusting the tube axis of the neck of the getter ring 20. It plays the role of regulating the position in the direction perpendicular to the direction.

8, 9, and 10 show that the getter support structure 29 of the cathode ray tube according to the present invention having the above-described structure is attached to the neck portion 5 of the small cathode ray tube 1 as shown in FIG. Shows how it is arranged inside. Here, in the getter support structure 29, as shown in FIG. 10, the outer surface of the support spring portion 22 is brought into pressure contact with the inner wall surface of the neck portion 5, and the position in the tube axis direction is fixed. As shown in FIGS. 8 and 9, the protruding portion 28 of the spacer portion 27 provided on the support arm portion 21 is brought into contact with the inner wall surface of the neck portion 5, so that the tube axis within the neck portion 5 is Gettering part 20 in the direction perpendicular to
The position of the gettering portion 20 is regulated so that the center axis Xg' of the getter ring portion 20 coincides with the tube axis Xt of the neck portion 5, as shown in FIG.

In this case, the spacer portion 27 has a relatively small dimension, and the contact area between its protruding portion 28 and the inner wall surface of the neck portion 5 is extremely small, so that when the gettering material 30 is scattered, the gettering portion 27
The heat generated by the heating of the spacer portion 27
The amount transmitted to the neck portion 5 via the wire 8 is extremely small, and no particular inconvenience occurs. Further, an annular U-shaped groove portion 23 provided in the getter ring portion 20
is placed at a position equally spaced from the inner wall surface of the neck portion 5 during one round, so that the scattering area of the getter material 30 is located at a distance from the getter ring portion 20, as shown by the imaginary lines in FIGS. 9 and 10. It will spread evenly around the Getter material 30
The scattering area is assumed to be sufficiently large.

11 and 12 respectively show other examples of getter support structures for cathode ray tubes according to the present invention. In FIGS. 11 and 12, parts corresponding to those shown in FIG. 4 are indicated with the same reference numerals as in FIG.
In the example shown in the figure, the spacer section 27 provided on the support arm 21 is formed by partially deforming the support arm 21. That is, in the example shown in FIG. 11, the support arm 21 is formed with a conical protrusion 31 that protrudes toward the outer surface thereof, and serves as a spacer portion 27.
In the example shown in the figure, the support arm portion 21 is formed with a folded raised portion 32 extending in a direction perpendicular to the extending direction of the rib 24 running thereon, and the spacer portion 2
It is said to be 7. Both the spacer portion 27 formed by the conical projection portion 31 and the spacer portion 27 formed by the folded protrusion portion 32 exhibit the same effect as the spacer portion 27 in the examples shown in FIGS. 4, 5, and 6. Ru.

Further, in the getter support structure for a cathode ray tube according to the present invention, a folded raised portion extending along the extending direction of the rib running therein is formed on the support arm portion, and the folded raised portion is used as a spacer portion. It's okay.

Effects of the Invention As is clear from the above description, when the getter support structure for a cathode ray tube according to the present invention is placed in the neck portion of the cathode ray tube, the getter ring portion into which the getter material is loaded is separated by a predetermined distance from there. At this position, the support spring part can be fixed in the neck part by pressing against the inner wall surface of the neck part, and the heat generated by heating the getter ring part when the getter material is scattered is transmitted to other parts, and the support spring part It is possible to avoid problems such as deterioration of the gettering part and generation of cracks in the neck part. Moreover, by providing the spacer part in the support arm part that connects the getter ring part and the support spring part, the getter ring part can be prevented from occurring in the neck part. The position is regulated so that its central axis coincides with the tube axis, and as a result, the electron beam from the electron gun assembly of the cathode ray tube collides with the gettering part, causing a shadow on the fluorescent surface. Inconveniences such as the gettering part coming into contact with the neck part can also be avoided, and further,
The scattering area of the getter material in the cathode ray tube can be made to have a large scattering area that spreads evenly around the getter ring portion, so that residual gas in the cathode ray tube can be efficiently sorbed.

[Brief explanation of drawings]

1, 2, and 3 are configuration diagrams for explaining a conventionally proposed getter support structure and a small cathode ray tube using the same, and FIGS. 4, 5, and 6 are , FIG. 7 is a side view, rear view, and top view showing an example of a getter support structure for a cathode ray tube according to the present invention; FIG. 7 is a perspective view showing an example of a spacer portion; FIGS. 8, 9, and 10. 11 and 12 are configuration diagrams for explaining the state in which the examples shown in FIGS. 4 to 6 are used in a small cathode ray tube, and FIGS.
The figures are side views showing other examples of getter support structures for cathode ray tubes according to the present invention. In the figure, 1 is a small cathode ray tube, 5 is a neck part, 20
21 is a getter ring portion, 21 is a support arm portion, 22 is a support spring portion, 23 is an annular U-shaped groove portion, 27 is a spacer portion, 28 is a protruding portion, 31 is a conical projection portion, and 32 is a folded ridge portion.

Claims (1)

[Claims] 1. A getter ring portion loaded with a getter material and disposed within the neck portion of the cathode ray tube, and a getter ring portion connected to the getter ring portion via a support arm portion and brought into pressure contact with an inner wall surface of the neck portion of the cathode ray tube. a support spring portion adapted to support the support arm portion, the support arm portion being in contact with an inner wall surface of the neck portion of the cathode ray tube, and a support spring portion configured to support the getter ring portion, and a support spring portion configured to support the cathode ray tube; A getter support structure for a cathode ray tube, comprising a spacer portion configured to restrict the position in a direction in which the getter is moved.