JPS6334206Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a frame used for reinforcing the shadow mask of a cathode ray tube.

Conventionally, this type of reinforcing frame has been shown in FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes a shadow mask of a shadow mask type color cathode ray tube, which includes an aperture 2 having numerous electron beam holes in its spherical part, a frame 3 for reinforcing this aperture 2, and a frame 3 surrounding the color cathode ray tube. It is composed of a spring 4 for fixing to a container (not shown). As shown in FIG. 2, in the frame 3, one end of a vertical wall 5 has a curved shape along the curvature of the spherical part of the aperture 2, and the other end has a horizontal wall 6 extending inward from the vertical wall 5. The cross-sectional shape of this frame 3 is L-shaped with vertical walls 5 and horizontal walls 6, as shown in FIG.

This frame 3 is made of sheet metal with a thickness of 1.6 mm to 2.0 mm, and is formed into a rectangular shape from the front.

As shown in FIG. 3, the frame 3 is attached by joining and fixing the lower inner surface of the aperture 2 to the upper outer surface of the vertical wall 5 of the frame 3.

Since the conventional frame 3 has the above shape, in order to have sufficient strength as reinforcement for the shadow mask 1, it is necessary to increase the plate thickness as described above, and a shadow mask using such a frame 3 1 is inevitably heavier, and if some mechanical shock is applied to the color cathode ray tube,
Spring 4 attached to the frame 3 above
The disadvantage was that the color cathode ray tube was deformed and the function of the color cathode ray tube was impaired.

In addition, in order to avoid the above problem, it is possible to reduce the thickness of the frame 3 so that the weight of the frame 3 is reduced, but if the thickness is reduced, the strength of the frame 3 will decrease, so deformation of the frame 3 itself becomes a problem. becomes. That is, since the frame 3 has a rectangular shape and the height of the vertical wall 5 is the lowest at the corner portion 31, stress tends to concentrate on the corner portion 31, and if the frame 3 is thin,
There was a problem that deformation occurred at the corner portion 31 and phenomena such as twisting appeared.

To improve this problem, attempts have been made to compensate for the reduced strength of the frame 3 by reducing the thickness of the frame 3. FIG. 4 shows an example of this, in which beads 8 are formed in the center portion 32 and corner portions 31 of the sides of the frame 3.
A shape aimed at improving the strength of the steel was devised. However, when the bead 8 is provided, a problem arises in that distortion occurs in the surrounding area, and simply providing the bead 8 has the disadvantage that it cannot compensate for the reduced strength due to the thinner plate thickness. .

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and it is a reinforcing frame made of a sheet metal with an almost rectangular shape in front for reinforcing the shadow mask. a horizontal wall connected to the end and extending inward;
an overhanging wall connected to a corner of one end of the vertical wall and extending inward substantially parallel to the horizontal wall; The purpose of the linear configuration is to improve the strength of the sheet metal reinforcing frame without increasing the plate thickness, and to facilitate the formation of the frame and reduce its weight.

An embodiment of this invention will be described below with reference to FIGS. 5 to 7.

In FIGS. 5 and 6, 30 is a reinforcing frame for a shadow mask having a substantially rectangular shape in front for reinforcing the shadow mask 1, and 5 is a cylindrical vertical wall whose one end 5a is connected to the shadow mask 1. The center portion 32 of the side is formed in a curved shape along the curvature of the shadow mask 1.
6 is a horizontal wall connected to the other end of the vertical wall 5 and extends inward in the radial direction of the frame 30; 7 is a projecting wall;
It is provided only in the corner part 31 and its peripheral part except for the corner part 2. The projecting wall 7 is approximately parallel to the horizontal wall 6 and bent inward in the radial direction of the frame 30, and the bending line M is straight. That is, the height H of the vertical wall 5 in the portion where the overhanging wall 7 is provided is the lowest at the corner portion 31 and increases linearly toward the center portion 32 of the side. In addition, this reinforcing frame 30
As shown in FIG. 6, the cross-sectional shape of is such that a vertical wall 5, a horizontal wall 6, and an overhanging wall 7 are connected in a U-shape.

The reinforcing frame 30 is made of sheet metal with a thickness of 1.2 mm.

Note that the aperture 2 to this reinforcing frame 30
The mounting method is the same as before.

The projecting wall 7 extends inwardly of the frame 30, and its projecting width a is equal to the width b of the horizontal wall 6 extending inwardly from one end of the vertical wall 5, as shown in FIG. It is formed with a width shorter than that of the

Therefore, the projecting wall 7 is shaped to project with respect to the oblique direction (arrow A) of the beam e of the color cathode ray tube (not shown), but the projecting width a of the projecting wall 7 is Since it is formed short, it does not block the beam e and does not cast a shadow on the screen of the color cathode ray tube.

By the way, it is well known that since the height of the vertical wall 5 of the reinforcing frame 30 is the lowest at the corner portion 31, stress tends to concentrate on the corner portion 31, causing deformation such as twisting. Since the overhanging wall 7 of the vertical wall 5 is provided only at the corner portion 31 and its surroundings, the stress concentrated at the corner portion 31 can be diffused by the overhanging wall 7.
Deformations such as twisting no longer occur.

Generally, one end (upper end) of the vertical wall 5 is formed in a curved shape along the curvature of the aperture 2, but when the overhanging wall 7 is provided at one end of the vertical wall 5, the reinforcing frame 30 has a U-shaped shape. Therefore, it is difficult to form the curved shape.

However, as shown in the embodiment of FIG. 5, if one end (upper end) of the vertical wall 5 provided with the overhanging wall 7 is formed into a linear shape, the reinforcing frame 30 can be easily formed.

Further, by bending and forming the overhanging wall 7 at the corner portion 31, stress concentrated at the corner portion 31 can be diffused and absorbed by the overhanging wall 7. Therefore,
The strength of the entire reinforcing frame 30 is increased, and deformation such as twisting can be prevented from occurring. According to the inventor's experiments, the same strength was obtained even if the thickness of the reinforcing frame, which was previously 1.6 mm, was reduced to 1.2 mm.

Therefore, a shadow mask equipped with this reinforcing frame can be made lighter, and
Even if some mechanical shock is applied to the color cathode ray tube, the conventional problems such as deformation of the spring attached to the frame are eliminated, and the function of the color cathode ray tube is not affected in any way. .

By using the reinforcing frame of this invention, the thickness of the reinforcing frame, which was conventionally 1.6 mm, can be reduced to 1.2 mm, and a 14" size reinforcing frame has a thickness of 1.6 mm and a weight of 450 g. By making the board 1.2mm thick, we were able to reduce the weight to 340g, making it possible to significantly reduce the weight.

In addition, the reinforcing frame 30 having the shape of this invention
By providing a reinforcing bead 8 as shown in FIG. 4, the plate thickness can be further reduced.
Even if the weight of the reinforcing frame 30 is further reduced, it is possible to manufacture a reinforcing frame with excellent strength.

As described above, according to this invention, the height of the vertical wall in the area where the overhanging wall is provided is the lowest at the corner and increases linearly toward the center of the side. can be easily bent. Therefore, the reinforcing frame can be easily formed, and productivity can be improved.

Further, by partially providing the overhanging wall on the vertical wall, it is possible to increase the strength of the entire frame and reduce the weight of the frame.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a conventional shadow mask, FIG. 2 is a perspective view showing the frame of FIG. 1,
Figure 3 is a sectional view taken along the - line in Figure 2;
The figure is a perspective view showing a modified example of the conventional frame.
7 to 7 show an embodiment of this invention, FIG. 5 is a perspective view showing a reinforcing frame according to one embodiment, FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIG. The figure is a longitudinal sectional view showing the reinforcing frame shown in FIG. 5 attached to the aperture. 1... Shadow mask, 2... Aperture, 3
0... Reinforcement frame, 5... Vertical wall, 6... Horizontal wall, 7... Overhanging wall, 8... Bead, a... Overhanging width, b... Horizontal wall width, H... Vertical wall height. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a cylindrical vertical wall that is a substantially rectangular sheet metal reinforcing frame that reinforces the shadow mask, the center of the side of which is connected to the shadow mask is curved along the curvature of the shadow mask; A horizontal wall connected to the other end of the vertical wall and extending radially inward, and a corner portion of one end of the vertical wall excluding the central portion and a peripheral portion thereof are bent. an overhanging wall that is substantially parallel to the horizontal wall and extends inward in the radial direction, and the height of the vertical wall in the part where the overhanging wall is provided is the lowest at the corner, and the height of the vertical wall is the lowest at the corner, and at the center of the side. A reinforcing frame for a shadow mask that increases linearly towards.