JPS59117053A - Color picture tube - Google Patents

Abstract

PURPOSE:To enhance reliability in positioning for setting up each internal part, by providing the panel and/or the funnel with projections disposed in the vicinity of the surface to be sealed thereby setting up, or securely holding, at least one of the internally equipped parts by means of these projections. CONSTITUTION:Four projections 4 are provided being integrated with the funnel 1 in the vicinity of the surface to be sealed. A stepped part 5 in the axial direction of this projection 4 is provided with a hole which fits on a retainer bead 6 provided on the side wall of said stepped part, while an internal magnetic shielding member 8 provided with an axial stopper 7 is fixedly mounted on the stepper part 5. By such construction, the internal magnetic shielding member 8 can be completely separated from the shadow mask assembly which is held by the panel pins. Therefore, in a large-sized color picture tube, the total weight to be held by the panel pins is only the weight of the shadow mask assembly, independently of the increased weight of the internal magnetic shielding member 8. Thus production of a crack in the tube or an error in the relative positioning between the holes provided in the shadow mask for allowing the electron beams to pass therethrough and the phosphor material layer forming the phosphor screen can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a color picture tube, and more particularly to an improvement in a shadow mask type color picture tube having internally mounted parts such as a shadow mask structure and an internal magnetic shield. be.

[Technical background of the invention and its problems]

The envelope of a general color picture tube consists of a panel, a funnel sealed to the end face of a side wall of the panel via a sealing glass, and a neck welded to the funnel.

A fluorescent surface is formed on the inner surface of this panel, and a frame is supported via a support member on panel pins implanted on the inner surface of the side wall of the panel.
In this case, a skirt part formed by bending around the perforated part of the electron beam passage hole part is supported by welding or the like, and an internal magnetic shield to prevent the influence of earth's magnetic field is also supported. The electron shield that blocks the electron beams that are generated is also supported by the frame.

That is, all of the internally mounted parts mentioned above are supported on the panel bin.

As a result, in a large color picture tube, the total weight of these internally mounted parts becomes large, making it difficult to support them on the panel pins, and even if they are supported, the reliability of the mounting position of each part deteriorates. In addition, if mechanical shock is applied, cracks will appear in the side walls, which will not only destroy the color picture tube, but also damage the internal parts, especially the electron beam passage hole drilled in the perforated part of the shadow mask, and the inner surface of the panel. This deteriorates the relative relationship with the attached phosphor layer that emits light in multiple colors, making it impossible for the electron beam from the electron gun installed in the neck to hit the desired phosphor layer, resulting in color shift and color unevenness. There is a problem in that the color picture tube is of poor quality and has a large number of defects.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and the present invention has been made in view of the above-mentioned problems. Or, the purpose is to provide a color picture tube in which the weight of internally mounted parts supported by panel pins is reduced by positioning and supporting and fixing them near the sealing part of the funnel, but the panel pins can be removed. There is.

[Summary of the invention]

That is, the present invention provides a panel having a fluorescent surface formed on its inner surface, a funnel sealed to the panel via a sealing glass, a neck welded to the funnel, and a neck mounted inside the panel and/or the funnel. In a color picture tube comprising at least internally mounted components such as a shadow mask structure and an internal magnetic shield, at least one of the internally mounted components is mounted and positioned on an inner wall in the vicinity of a sealing surface of a panel and/or a funnel. This color picture tube is characterized by being provided with a protrusion that can be supported and fixed.

[Embodiment of the Invention] Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. However, the frame and shadow mask are supported via a support structure in the panel bin on the side wall of the panel with a fluorescent surface formed on the inner surface, which is the same as in a normal color picture tube, so this is omitted. An example in which a shield is supported and fixed will be described.

That is, in the vicinity of the sealing surface of a part of the funnel (1) of an envelope consisting of a funnel (1) and a neck (2) welded to the funnel (1), four protrusions (4) are attached to the funnel (1). +1), and the step (5) in the tube axis direction of this protrusion (4) has a hole that fits into a presser bead (6) provided on the side wall of this step. At the same time, an internal magnetic shield (8) having a stopper (7) in the tube axis direction is supported and fixed on the step (5).

With this structure, the internal magnetic shield (8) is completely separate from the shadow mask structure supported by the bin, which makes the internal magnetic shield (8) heavy in large color picture tubes. However, the total weight supported by the Hanel pin is only the shadow mask structure, and as in the past, cracks and misalignment of the relative position between the electron beam passage hole of the shadow mask and the phosphor layer constituting the phosphor surface do not occur. It has the effect of making it harder.

In the above embodiment, the internal magnetic shield is provided on the protrusion provided near the sealing surface of the funnel, but is not limited to this, and may be provided near the sealing surface of the panel. The frame of the shadow mask structure may be supported and fixed to the protrusion, or if the shadow mask structure is frameless, the skirt portion of the shadow mask may be similarly supported and fixed. Further, protrusions may be provided at opposite positions of the funnel and the panel, and the shadow mask structure and the internal magnetic shield may be installed, supported and fixed between the protrusions. However, in the case of a shadow mask structure, it is heavier than the internal magnetic shield, so if the top surface of the step (5) shown in Figure 2 is not secured with reinforcing metal fittings, the glass forming the protrusion may be damaged. In addition, in the above-mentioned embodiment, a protrusion is provided at the center of the side part, and the shadow mask is not limited to this. Any position that is effective for mounting and supporting and fixing internally mounted parts such as the structure and internal magnetic shielding may be used, and it is not limited to a square protrusion, but may have other shapes. Of course.

[Effects of the Invention] As described above, according to the present invention, a protrusion is provided near the sealing surface of the panel and/or funnel, and the protrusion determines the mounting position and supports and fixes at least one of the internally installed parts. This makes it possible to reduce the total weight of internally mounted parts on the panel pins, improve the reliability of the mounting position of each part, and also simplify some parts of the conventional manufacturing process without making major changes. Its industrial value is great because it can be converted into

[Brief explanation of the drawing]

1 and 2 are diagrams showing essential parts of an embodiment of the present invention. FIG. 1 is a perspective view showing the relationship between the funnel, the neck, and the internal magnetic shield, and FIG. 2 is the same as that shown in FIG. It is an enlarged view of part A. ■...Funnel 2...Neck 3...Sealing surface 4...Protrusion 5...Step part
6... Presser bead 7 - tube axial direction stopper 8...
Internal Magnetic Shielding Agent Patent Attorney Inoue - Male Figure 1 Figure 2

Claims (1)

[Claims] A shadow mask structure comprising: a panel having a fluorescent surface formed on its inner surface; a funnel sealed to the panel via a sealing glass; a neck welded to the funnel; and a shadow mask structure installed in the panel and/or the funnel. , a color picture tube comprising at least internally mounted parts such as an internal magnetic shield, and at least one of the internally mounted parts is mounted, positioned, supported and fixed on an inner wall near the sealing surface of the panel and/or funnel. 1. A color picture tube characterized by being provided with a protrusion that can