JPS5944737B2 - color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shadow mask type color picture tube, and more particularly to a shadow mask support structure of the picture tube.

As shown in FIG. 1, in a conventional color picture tube, a panel 1 is formed into a dish shape, and a shadow mask structure 3 has a plurality of pins 6 set on the inner wall of the panel 1, and a spring 7 having engagement holes. Supported through.

The shadow mask structure generally includes a shadow mask 4 formed into a curved shape and having a large number of openings of about 0 to 15 mm, and a metal frame (for maintaining the formation of this shadow mask and improving its mechanical strength). frame) consists of 5 frames.

Fluorescent dots or stripes 9 are formed on the inner surface of the panel 1 in correspondence with the shadow mask holes 8, so that an electron beam emitted from an electron gun (not shown) passes through the shadow mask holes 8. The phosphor is designed to correctly strike a predetermined phosphor.

Although this conventional color picture tube structure is the most commonly used structure, it has the following points that should be improved.

That is, in general, the shadow mask 4 and the frame 5 have greatly different material thicknesses, and therefore have significantly different heat capacities, and therefore exhibit different expansion characteristics over time in response to rapid temperature changes.

In general, the heat capacity of the shadow mask 4 is much smaller than that of the frame 5, so if the shadow mask rapidly expands due to the electron beam during operation of the picture tube, the expansion of the frame 5 cannot follow, and only the shadow mask expands relatively. I come to do it.

In this case, since the peripheral part of the shadow mask 4 is fixed by the frame 5, the shadow mask 4 is deformed into a dome shape, and the opening position of the shadow mask is the phosphor formed on the inner surface of the panel. The color changes relative to the dots or stripes 9, and the correspondence breaks down, resulting in deterioration of color purity.

The present invention eliminates the drawbacks of the conventional structure and provides an inexpensive structure, and will be explained below with reference to the embodiment shown in FIG.

In FIG. 2, the shadow mask 12 has a planar shape, and a plate-shaped reinforcing body 13 is welded and fixed to the end thereof. There is a notch 17.

A plate-shaped spring 15 is attached to this notch 17,
Configure a shadow mask structure.

This shadow mask structure is supported by a stud 14 implanted on the inner surface near the end of the panel 11 having a slight curvature and located inside (on the tube axis side) of the peripheral end of the shadow mask structure. ing.

A protrusion 16 is provided on a portion of this stud 14 toward the panel end.

The shadow mask structure is supported by the panel 11 by engaging the engagement hole 18 provided in the spring 15 with the protrusion 16 of the stud 14.

Since the spring 15 and the stud 14 are located inside the peripheral end of the shadow mask structure, that is, the peripheral end of the plate-shaped reinforcing body 130, the spring 15 uses the protrusion 16 of the stud 14 as a fulcrum, and moves the plate-shaped reinforcing body 13 in the peripheral direction. Apply force to push it out (toward the edge of the panel).

That is, the shadow mask 12 is supported so as to be pulled toward the end of the panel.

Of course, in this case, the seal portion 10 of the funnel 2 in FIG. 1 is adapted to match the shape of the end of the panel 11 in FIG. 2.

The structure according to the invention shown in the above embodiments has a number of advantages as described below.

First, since the shadow mask is not limited in its expansion,
It has the advantage that there is no deterioration in color purity due to the difference in heat capacity with the frame in the conventional structure.

In addition, deterioration of color purity due to the free expansion of the shadow mask is avoided in the conventional structure (a known bimetal is used as the spring material, and the shadow mask and plate-shaped reinforcing member are connected to the fluorescent surface in proportion to the temperature of the shadow mask. All you have to do is make it closer to .

In addition, the plate-shaped reinforcing member does not need to have a complicated structure like the conventional structure, and is easy to mass produce and therefore inexpensive.

Furthermore, since it is a flat shadow mask, it is possible to omit the shadow mask pressing process required for conventional structures, and the compatibility of shadow masks is increased, allowing for the use of a mask pattern-based screen manufacturing method, which was not possible with conventional structures. It is also possible to manufacture picture tubes at low cost.

As is clear from the above description, the feature of the present invention is that the shadow mask is elastically supported under tension in the peripheral direction thereof, and therefore, within this range, it is not limited to the structure of the above embodiment, and other structures are also possible.

That is, in the above embodiment, the panel was spherical and the shadow mask was flat, but the distance between the panel and shadow mask determined by design is satisfied, and the shadow mask surface shape is flat or cylindrical. It is clear that there are no restrictions on the curvature or shape of the panel as long as it is.

For example, if the panel is a dish-shaped panel similar to the conventional structure shown in FIG. 1, and studs according to the present invention are installed on the inner wall of the panel, the present invention can be applied as is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a conventional color picture tube, and FIG. 2 is a perspective view of main parts showing the structure of the color picture tube of the present invention.
FIG. 3 is a perspective view of a stud applied to the present invention. 1.11...Panel, 4,12-=...Shadow mask, 13...Reinforcement material, 15...
・Spring, 14...Stud, 16...
...protrusion.

Claims (1)

[Claims] 1. In a color picture tube having a flat or curved panel and a flat or cylindrical shadow mask, a stud installed in a portion of the panel located inside the outer peripheral edge of the shadow mask and a stud installed inside the outer peripheral edge of the shadow mask. A color picture tube characterized in that the shadow mask is supported by a spring so as to be tensioned toward an end of the panel.