JPH03238733A - Manufacture of explosion-proof type braun tube - Google Patents

Abstract

PURPOSE:To obtain productivity with high precision by grinding the plane at which holding metal fittings are held at the final process of explosion proofing treatment. CONSTITUTION:The plate thickness of a clamp face 10B of holding metal fittings 10 is made slightly thick and the distance (h) between a Z point and the clamp face 10B is made smaller than a specified size for explosion proofing treatment. As final process of the explosion proofing treatment, the clamp face 10B of the holding metal fittings 10 is so ground using the Z point as a standard as to obtain the specified size (h). That the clamp face 10B is made slightly thick makes it possible to obtain high precision of flatness and smoothness by easy grinding work and also each size (h) of four holding metal fittings 10 are easily made the same size since the Z point is used as the standard. Consequently, production with high precision is obtained and work efficiency of assembling to a working set is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] This invention relates to a method of manufacturing an explosion-proof cathode ray tube.

[Conventional technology]

An example of a conventional explosion-proof cathode ray tube is explained with reference to FIG. 2. In FIG. ), an adhesive material (5) such as adhesive tape or adhesive is attached to the outer periphery of the panel skirt portion (2a), and a pair of U-shaped rim bands (6), (6) are attached. . The tension bands (8) and (9) that pass through the caulking member (7) having a C-shaped cross section are the rim band (
The rim band (6) is tightened by surrounding the outer periphery of the rim band (6), and the tension of the tension bands (8), (9)
and the panel skirt part (2a) via the adhesive material (5).
is pressed inward of the tube (1). This pressing force reduces the expansion of the panel skirt portion (2a), thereby preventing the implosion phenomenon of the tube body (1). Holding fittings (10) are provided at the four corners of the rim band (6), have an L-shaped cross section, and are used to hold the tube body (1). This holding metal fitting (10) is formed to become slightly thinner as it approaches both ends (10a) (loa) thereof, and as shown in FIG. 3, has a tension band (8).

(9) and the rim band (6), and is firmly fixed to the tube body (1).

Next, attach the holding fitting (10) to the tension band (8), (
9) and the rim band (6) and fixing it to the tube body (1) will be explained with reference to FIG. A pair of rim bands (6) and holding metal fittings (
10) are attached in advance, and then the tube body (1) with the adhesive material (5) pasted on the outer periphery of the panel skirt portion (2a) is placed inside the explosion-proof treatment equipment with the panel face portion (2b) facing down. Insert the zero-order tension bands (8) and (9) inside the pair of rim bands (6) into the rim band (6).
Wrap it around the outer periphery of the holding fitting (10) and tighten.

[Problem to be solved by the invention]

In the explosion-proof cathode ray tube manufactured by the above method, the panel face part (2b) is a reference point near each diagonal part,
In other words, it is supported by four reference points (referred to as two points). At this time, the holding metal fitting for the explosion-proofed tube (1) (
The dimension 10) is defined by the distance (h) from the above two points. However, since the holding fitting (10) is formed into an L-shape by press molding, variations in the bending angle tend to occur, and the mounting surface (ta) of the holding fitting (10) tends to vary.
There was a problem that the precision of flatness and flatness of b) was likely to deteriorate.

In addition, the rim band (6) and holding metal fittings (
In order to improve the efficiency of the installation work in step 10), there is a type in which the holding metal fitting (10) is welded to the rim band (6) in advance, but in this type, the accuracy of the dimension (h) above is further deteriorated. I didn't like it.

Therefore, the dimension (h) will be explained. As shown in Figure 4, the face part (11) of the action set is formed into a scrap shape that covers the end of the rim band (6) on the panel face part (2b), and this action set is provided with explosion-proof treatment. When a cathode ray tube is installed, the panel face part (2b
) The mounting and fixing is completed in a state where the face portion (11) of the motion set is in contact with the periphery of. However, when the above dimension (h) becomes smaller, the face part (11) of the above action set becomes smaller.
Since the panel face part (2b) and the panel face part (2b) no longer come into contact with each other,
A gap will occur between the two, resulting in a defect; conversely, the above (h)
If the dimensions become larger, the panel face portion (2b) will press against the face portion (11) of the action set. Since the face portion (11) of the motion set is generally molded from resin, it will be damaged by the pressing force.

For the above reasons, it is necessary to make each (h) dimension of the four holding fittings (10) the same, which significantly reduces workability and requires high precision manufacturability.

The present invention has been made to solve these problems, and an object of the present invention is to provide a method for manufacturing an explosion-proof cathode ray tube that can achieve high-precision manufacturability.

[Means for Solving the Problems J The method for manufacturing an explosion-proof cathode ray tube according to the present invention is capable of manufacturing specified dimensions with high precision by polishing the surface on which the holding fitting is held in the final process of explosion-proof treatment. It is something.

[Function 1] In the present invention, the prescribed dimensions of the four holding fittings can be made to be the same with high precision, so that workability is facilitated in the work of assembling the holding fittings into the operation set, and the yield rate of non-defective products can be significantly improved.

[Example] An embodiment of the present invention will be described below with reference to FIG.

The difference from the conventional method in FIG. 1 is that the thickness of the mounting surface (IOB) of the holding fitting (10) is slightly increased. Furthermore, the distance (h) between the two points and the mounting surface (IOB) is preliminarily treated to be explosion-proof so that it is smaller than the specified dimension. Therefore, as the final step of explosion-proof treatment, a step is provided to polish the mounting surface (10B) of the holding fitting (10) using two points as reference points so that the specified dimension (h) is obtained. , mounting surface (IO
Slightly thickening the plate thickness in B) makes it possible to easily achieve high accuracy in flatness and flatness with a simple polishing operation. Also, since two points are used as the reference, there are four holding fittings (10).
It becomes possible to easily obtain the same dimensions with high precision for each (h) dimension. Since the explosion-proof treatment is based on seven points, the polishing process described above can also be performed on the same manufacturing line.

Furthermore, the above manufacturing method can be similarly applied to a type in which the rim bunt (6) and the holding fitting (10) are welded to improve the workability of explosion-proof treatment.

Furthermore, in a cathode ray tube having a structure in which an explosion-proof band made of a ring-shaped metal band is welded to the outer periphery of the panel skirt portion (2a) of the cathode ray tube via an adhesive material (5) and a mounting bracket (10) is tightened by shrink fitting, 2 in its manufacturing method
Since point support is used as the standard, the above manufacturing method in which the final step is polishing can be applied.

[Effects of the Invention] As described above, according to the present invention, the surface on which the holding fitting is held is polished in the final process of explosion-proof treatment, so highly accurate manufacturing dimensions can be obtained, and the adjustment to the operation set can be improved. The effect is that work efficiency is improved during assembly work, and a significant improvement in the rate of non-defective products is expected.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a perspective view showing a conventional cathode ray tube, Fig. 3 is a sectional view of the main part of Fig. 2, and Fig. 4 shows the installed state. It is a sectional view of the main part. In the figure, (2a) is the panel skirt part, (2b) is the panel face part, (5) is the adhesive material, (6) is the rim band, (8) and (9) are the tension band, (10) is the holding metal fitting, (IOB) indicates the mounting surface. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A method for manufacturing a cathode ray tube in which a rim band is attached to the outer periphery of a panel skirt portion of the cathode ray tube via an adhesive material, and a tension band that holds a holding fitting for holding the cathode ray tube between the rim band and an explosion proof treatment is provided. A method for manufacturing an explosion-proof cathode ray tube, characterized in that in the final step of processing, at least one surface on which the holding fitting is held is polished.