JP3400361B2 - Anode connection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anode connection structure which penetrates a funnel cone portion of a cathode ray tube and introduces a high voltage into the cathode ray tube from the outside.

[0002]

2. Description of the Related Art FIG. 1 is a partial sectional view of a cathode ray tube according to the prior art. The cathode ray tube is composed of a funnel portion 1 which is usually an outer container, an electron gun 2 which emits electrons, and a face plate 3 which has a fluorescent film 4 which emits light by electron collision and draws an image. Further, a metal part 5 called an anode button for introducing a high voltage from the outside of the cone of the funnel 1 into the funnel 1 is embedded and welded in the funnel cone portion. A conductive film 6 is disposed on the inner surface of the funnel cone portion, and the conductive film 6 has an anode contact 7a.
A high voltage is applied via. A conductive film 8 is formed on the upper surface of the fluorescent film 4 and its periphery, and a high voltage is applied via the anode contact 7b.

FIG. 2 is a partial cross-sectional view of a conventional cathode ray tube in the vicinity of an anode button. FIG. 3 is a side view of the cathode ray tube as seen from the anode button side. Anode button 1
Reference numeral 3 denotes a truncated cone shape, and a small circle side is called a bottom surface portion 12 and an opposite large circle side is called an upper surface portion 11. The bottom surface portion 12 is disposed inside the funnel cone portion 10, and the top surface portion 13 is disposed outside the funnel cone portion 10 and fixed by welding. The anode button 11 has a shape in which the inside is hollowed out from the upper surface portion 13, and an anode connector (not shown)
The end of a high voltage lead, called a.
Further, the upper surface portion 13 of the anode button 11 is provided with a small amount of barb inside so that the anode connector is caught and cannot be easily removed. The left side of the funnel cone portion 10 in the figure is the inside of the cathode ray, and when completed, it is held in vacuum.

By the way, in many cases, depending on the specifications of the cathode ray tube, the internal conductive film may not be able to conduct electricity between the funnel cone portion and the face plate. In such a case, an elastic body (anode contact 7
(a, 7b, etc.) provides electrical continuity (see FIG. 1), but almost all the inner surface of the funnel cone portion 1 has a curved shape, and it is very difficult to attach the elastic body. Therefore, methods of attaching the elastic body to the anode button have been considered in various fields. For example, it is a structure in which a stepped portion is further provided by drawing on the bottom surface portion (described above) of the anode button that is formed by drawing, and the elastic body for connection described above is attached to this portion. FIG. 4 is a cross-sectional view in which a step portion is formed on the bottom surface of the anode button by drawing.

FIG. 5 is a cross-sectional view showing a conventional anode connection structure. The pin 14 is fixed to the bottom surface 12 of the anode button 11, and the anode contact 1 is attached to the other end of the pin.
5 is fixed by means such as welding.

[0006]

However, the structure shown in FIG. 4 can be formed by drawing when the anode button is large. For example, the bottom surface of the anode button has a diameter of 10 mm or less. For such small parts, forming by drawing becomes difficult. There is a concern that cracking may occur in the anode button if the drawing process is forcibly performed, which may cause a pressure increase (vacuum break) in the cathode ray tube. Further, if the anode button is smaller, drawing processing becomes impossible, which causes a serious problem in the specifications of the cathode ray tube.

In the structure of FIG. 5, it is necessary to weld the anode contact 15 after welding the anode button to the funnel, which makes it difficult to position the anode contact and the workability is extremely poor. Self-positioning may be considered depending on the shape of the anode contact, but the welding position of the anode button varies greatly, and there is a drawback that position correction by the anode contact cannot be performed.

[0008]

According to the present invention, in an anode connection structure in which a high voltage is introduced into the cathode ray tube from the outside through a funnel cone portion, the anode button which is fixed to the funnel cone portion by welding is positioned inside the cathode ray tube. The end portion of the large diameter portion of the stepped pin, which is smaller than the bottom portion of the anode button, is fixed to the bottom portion of the anode button.

In the present invention, in the anode connection structure in which a high voltage is introduced into the cathode ray tube from the outside through the funnel cone portion, the bottom surface portion of the anode button located inside the cathode ray tube of the anode button that is welded and fixed to the funnel cone portion. In addition, the maximum large diameter portion fixes the end portion of the large diameter portion of the stepped pin smaller than the bottom surface portion of the anode button, and positions the anode contact at the small diameter portion and the stepped portion of the stepped pin.

The anode contact is generally T-shaped or Y-shaped, and is provided with a plurality of holes for fitting with the small diameter portion of the stepped pin.

The anode contact is rotatably fixed around the small diameter portion of the stepped pin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 6 is a cross-sectional view of the vicinity of the anode button of the cathode ray tube using the anode button of the embodiment of the present invention, and is a schematic view seen from the face plate side of FIG. 7. FIG. 8 is a front view of the vicinity of the anode contact showing the anode connection structure of the present invention, and FIG. 9 is a side view. FIG. 10 is a front view of the anode contact, and FIG. 11 is a side view.

The cathode ray tube of this embodiment has a funnel 20.
Flat face plate on the open end of the cone
4 is a structure welded by the frit glass 28.
An anode button 21 is welded to the cone portion of the funnel 20, and the stepped pin 2 is provided on the bottom portion of the anode button.
2 is stuck. A conductive film 29 is formed on the entire surface of the funnel 20 including the surface of the anode button 21. The face plate 24 has a fluorescent film 25 at the center.
Is formed and a light-shielding conductive film 26 is formed around it. A metal film (not shown) called a metal back is formed on the upper surface of the fluorescent film 25. On the outer periphery of the conductive film 26, there is a welding margin 27 that is welded to the open end of the funnel 20 by the frit glass 28. Anode contact 2
3 is rotatably fixed to the stepped pin 22 fixed to the anode button 21, and one end thereof is in contact with the conductive film 26 formed on the face plate 24 (details will be described later). With this anode connection structure, the anode button 2
1 is applied to the conductive film 29 formed on the funnel 20 and the conductive film 2 formed on the face plate 24.
6 and metal back.

Anode button 21 on the funnel cone
Is embedded and fixed, and on the bottom of the anode button 21,
Metal stepped pin 2 toward the inside of the funnel cone
2 is stuck. For example, the bottom surface of the anode button 21 has a diameter of 6 mm, and the maximum outer diameter is about 10 mm.
The small diameter portion 22a of the stepped pin 22 fixed to this is 1 m.
It is a very small part with a diameter of m and a length of 3 mm. With this structure, a component such as an elastic body (anode contact) mounted inside the cathode ray tube can be easily inserted into and fixed to the pin 22a, and a high voltage can be surely conducted. An end surface of a portion 22b having a large outer diameter of the stepped pin 22 is fixed to the bottom surface of the anode button 21. By fitting and fixing the anode contact 23, the distance from the bottom surface of the anode button 21 can be arbitrarily set (determined by the length of the large diameter portion) and made constant.

As shown in FIG. 10, the anode contact 2
3 is Y-shaped (or approximately T-shaped). Anode button 2 which is pressed from a thin strip of material
There are a plurality of holes (three in the figure, 23a, 23b, 2
3c) formed. A dowel 23e for contacting the conductive film 29 formed on the funnel 20 is formed substantially at the center. Extending to both sides at the upper portion is a terminal portion whose tip contacts the conductive film 26 formed on the face plate 24, and the tip 23d has a spring property so that it can move downward in the figure. .

FIG. 8 is a front view of the vicinity of the anode contact showing the anode connection structure of the present invention, and FIG. 9 is a side view. The anode contact 23 is fitted into the small diameter portion 22a of the stepped pin 22 through the hole 23b, and the lower surface has the stepped pin 2
The second stepped portion 22c is closely attached and positioned and fixed. A plurality of holes are provided for adjustment when the welding position of the anode button 21 is displaced. When the position from the open end face of the funnel is below, the lower hole 23c is used, and when it is above it. Use the upper hole 23a. Also,
This is because the anode contact 23 can be commonly used even when the position of the anode button 21 is changed. The anode contact 23 is attached before welding the funnel 20 and the face plate 24. In FIG. 8, the anode contact 23 is attached at a normal position, but even if the attachment position is displaced, the attachment can be rotated in the direction of the arrow in the figure unlike welding or the like, so that it can be corrected after attachment.

When the anode contact 23 is attached, the terminal portion 23d protrudes above the open end surface of the funnel 20. Conductive film 2 formed on face plate 24
The face plate 24 is pressed against the open end surface of the funnel through the frit glass 28 and welded so that 6 touches the terminal portion 23d of the anode contact 23, so that the terminal portion 23d of the anode contact 23 and the conductive film 26 of the face plate 24. Are configured to conduct with sufficient spring pressure. As can be seen in FIG. 11, the anode contact 23 is shaped like a dogleg, and when pressed in the direction A of the arrow in FIG. 9, the dowel portion 23e is pressed in the direction B of the arrow and adheres to the conductive film 29 formed on the funnel 20. It has a structure that

[0018]

According to the present invention, the parts of the elastic body (anode contact etc.) inside the cathode ray tube can be fitted and fixed, and the internal high voltage can be satisfactorily conducted. Further, it is possible to provide an anode connection structure in which the distance between the fitted and fixed component and the anode button can be kept constant by arbitrarily setting the position of the step using the stepped pin. For example,
For small cathode ray tubes such as 2 inches and 3 inches,
Since the anode button is very small and a special shape cannot be integrally molded, when applied to such an anode connection structure of a cathode ray tube, the structure is simple and stable high voltage introduction is possible.

With the anode contact structure of the present invention,
A displacement of the anode button can be easily dealt with, and a stable anode connection structure can be obtained.

The anode contact and the anode connection structure of the present invention facilitate the assembly of the anode contact and facilitate the position correction after the assembly.

[Brief description of drawings]

1 is a partial cross-sectional view of a cathode ray tube according to the prior art.

FIG. 2 is a partial cross-sectional view in the vicinity of an anode button of a cathode ray tube according to a conventional technique.

FIG. 3 is a side view of the cathode ray tube viewed from the anode button side.

FIG. 4 is a cross-sectional view in which a step portion is provided on the bottom surface of the anode button by drawing.

FIG. 5 is a cross-sectional view showing a conventional anode connection structure.

FIG. 6 is a cross-sectional view of the vicinity of an anode button of a cathode ray tube using the anode button of the embodiment of the present invention.

FIG. 7 is a schematic view seen from the face plate side.

FIG. 8 is a front view of the vicinity of an anode contact showing the anode connection structure of the present invention.

FIG. 9 is a side view.

FIG. 10 is a front view of an anode contact.

FIG. 11 is a side view.

[Explanation of symbols]

1 funnel part 2 electron gun 3 face plate 4 Fluorescent film 5 metal parts 6 Conductive film 7a Anode contact 7b Anode contact 8 Conductive film 10 Funnel cone section 11 Anode button 12 Anode button bottom 13 Anode button top surface 14 pin 15 Anode contact 20 funnels 21 Anode button 22 stepped pin 22a Stepped pin small diameter part 22b Large stepped pin diameter 22c Stepped part of stepped pin 23 Anode contact 23a hole 23b hole 23c hole 23d terminal hole 23e Dowel 24 face plate 25 Fluorescent film 26 Conductive film 27 Welding allowance 28 frit glass 29 Conductive film

Claims (4)

(57) [Claims] 1. In an anode connection structure in which a high voltage is introduced into the cathode ray tube from the outside through the funnel cone portion, the bottom surface of the anode button located inside the cathode ray tube of the anode button that is welded and fixed to the funnel cone portion,
The anode connecting structure is characterized in that the maximum diameter large portion is fixed to the end portion of the large diameter portion of the stepped pin smaller than the bottom portion of the anode button. 2. In an anode connection structure for penetrating a funnel cone portion and introducing a high voltage from the outside into the cathode ray tube, a bottom surface portion of the anode button located inside the cathode ray tube of the anode button welded and fixed to the funnel cone portion,
Maximum diameter portion is an anode connecting structure, characterized in that said anode button bottom portion fixing a from the large diameter end face of the small stepped pin, and the positioning of the anode contact with the small-diameter portion and the stepped portion of the stepped pin. 3. The anode contact is generally T-shaped or Y-shaped.
3. The anode connecting structure according to claim 2, wherein the anode connecting structure is shaped and has a plurality of holes that fit into the small diameter portions of the stepped pins. 4. The anode connection structure according to claim 2 or 3, wherein the anode contact is rotatably fixed around a small diameter portion of the stepped pin.