JPS5929323Y2 - Spring for holding shadow mask - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shadow mask holding spring used for fixing the shadow mask of a shadow mask type color picture tube to the inner surface of the panel.

As shown in FIG. 1, the shadow mask structure of a conventional color picture tube consists of a shaped shadow mask 1, a support frame 2 that reinforces the periphery of the shadow mask 1, and a support frame 2 that is welded and fixed to the shadow mask 1 and the support frame 2. By fitting a hole 4 provided in this spring 3 into a panel pin (not shown) planted on the inner surface of a panel (not shown), the shadow mask structure is inserted into the panel. Retained.

Note that the x mark in the figure indicates a welded part.

As shown in FIG. 2, the spring 3 includes a mask fixing part 5 fixed to the shadow mask 1, a tongue part 6 provided with a hole 4 for fitting a panel pin, and the mask fixing part 5 and the tongue part. The inclined portion 7 connected to the portion 6 is integrally formed from a plate material.

Further, a notch 8 is provided in the mask fixing portion 5 connected to the inclined portion 7 to form a protruding portion 9.

Therefore, when the shadow mask structure shown in FIG. 1 having such a spring 3 is assembled into a pile, a torsional force as shown by reference numeral 10 is applied to the spring 3, and the base of the sloped part 7 fixes the mask at the root. A force resisting the torsion force is generated in the portion 5.

Due to the force resisting this torsion, the spring 3 generates a force that causes the hole 4 to fit into the panel pin, that is, a spring force.

This spring force is determined by the magnitude of the force resisting the torsion of the portion indicated by reference numeral 10.

It is necessary that the spring force has an appropriate strength to ensure reproducibility of the position of the shadow mask and workability of attaching and detaching the shadow mask, and that the spring constant of the cover is not deteriorated.

However, in the spring 3 described above, a phenomenon was observed in which the spring force deteriorated due to several times of mask attachment and detachment operations during the color picture tube manufacturing process.

Further, in order to reduce the cost, it is necessary to reduce the thickness of the spring 3, but if it is made thinner, it has the disadvantage that an appropriate spring force cannot be obtained.

The present invention was devised in view of the above-mentioned drawbacks of the prior art, and provides a shadow mask holding spring that can provide strong spring force without deteriorating the spring constant even when formed from a thin plate, and can firmly hold the shadow mask. The purpose is to

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 3 shows a first embodiment of the present invention.

As in the conventional case, the spring 11 includes a mask fixing part 12 fixed to the shadow mask, a tongue part 14 provided with a hole 13 to fit a panel pin, and the mask fixing part 12.
and an inclined portion 15 connected to the tongue portion 14 are integrally formed from a plate material.

In the present invention, the upper end of the mask fixing part 12 is bent to form a protrusion 16.

By providing the bending protrusion 16 in this manner, the rigidity of the mask fixing portion 12 is increased, and a strong spring force similar to that obtained by increasing the thickness of the spring 11 can be obtained.

Further, when the shadow mask structure is assembled into a panel, the spring 11 has a mask fixing portion 12 corresponding to the inclined portion 15.
Although warping occurs, the protrusion 16 acts to suppress this warping, and this also provides a strong spring force.

FIG. 4 shows a second embodiment of the present invention.

In this embodiment, a protrusion 17 is formed on the mask fixing portion 12 in the direction of the skirt side of the shadow mask, and even with this configuration, the same effect as in the previous embodiment can be achieved.

In each of the embodiments described above, the protrusions 16 and 17 were provided along the entire skirt side, but it is sufficient to provide them at least on the mask fixing part 12 corresponding to the inclined part 15.

Further, although a case is shown in which there is no protrusion 9 as shown in FIG. 2, the protrusion 9 may be provided.

FIG. 5 shows a third embodiment of the present invention.

In this embodiment, the protrusions 18 are provided in a direction perpendicular to the skirt side direction, and even if formed in this way, the same effects as those of the previous embodiments can be achieved.

As is clear from the above description, the spring according to the present invention has a structure in which a protrusion is provided on the mask fixing portion, so that a sufficiently strong spring force can be obtained even if the plate thickness is reduced, and costs can be reduced.

[Brief explanation of the drawing]

Figure 1 shows a conventional shadow mask structure with an oblique angle [l], Figure 2 is a front view and side view showing the spring in Figure 1, and Figure 3 shows a front view and side view of the spring in Figure 1.
Figures 4 and 5 are a front view and a side view respectively showing the first, second and third embodiments of the spring according to the present invention. 11... Spring, 12... Mask fixing part, 13... Hole, 14... Tongue piece part, 15... Slanted part, 16.17,18...
··protrusion.

Claims (1)

[Scope of utility model registration request] In order to fix the shadow mask of a shadow mask type color picture tube to the inner surface of the panel, there is a mask fixing part that is fixed to the shadow mask, and a tongue piece that is provided with a hole to fit into a panel pin planted on the inner surface of the panel. and an inclined part connected to the mask fixing part and the tongue part are integrally formed of a plate material,
A spring for holding a shadow mask, characterized in that a protrusion is provided on the mask fixing part.