JPS5813578Y2 - cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cathode ray tubes, and particularly to improvements in reinforcing metal bands thereof.

In a conventional cathode ray tube, for example, a color picture tube, as shown in FIG. It is reinforced by wrapping a metal band 4 around it.

This metal band 4 contacts and covers the front edge of the panel portion 2 over almost its entire length on the front edge of the central band 5, as shown in FIG. It has a front edge part 6 which is curved inwardly, and a side edge part 7, that is, a skirt part, which covers the outer circumferential surface of the funnel part 3 with a gap over the entire length of the rear edge, and the end part thereof. 4a and 4b are the center band 5 button and each end 5a of the side edge 7
tsbz- and γa.

Notches 6a and 6bffi are formed at the end of the front edge 6 so that the notches 7b overlap each other and do not overlap.

Then, a tension band 8 is wrapped around this metal band 4 and tightened.

In this metal band 4, the side edge 7 is also overlapped at the ends 7a and 7b, so that the step 9a of the upper side edge end 7a overlaps the lower side edge, as shown in the third figure. End 7
Due to this influence, the upper end 4a of the band 4 is shifted forward, that is, toward the main frame side, than the lower end 4b.

Therefore, the edge 10a of the front edge 6 of the metal band 4 near the upper notch 6a protrudes forward from the front edge of the panel section 2, that is, toward the main frame side, and does not come into close contact with the front edge of the panel section 2, resulting in a reinforcing function. It harms the environment and does not look good.

It is an object of the present invention to eliminate such drawbacks of the prior art and provide a cathode ray tube that eliminates misalignment of the overlapping portions of metal bands, has a large reinforcing effect, and has a good appearance.

The gist of the present invention is that a notch is provided in the overlapping part of at least one end of the metal band to prevent the stepped part from overlapping.

Hereinafter, details of the present invention will be explained with reference to the embodiments shown in FIGS. 4 and 5.

The figure shows an improved version of the metal band shown in Figure 1, and corresponds to Figures 2 and 3.

In the figure, 4 is called a rim band and is a reinforcing metal band wrapped around the outer peripheral surface of the valve 1, 4a and 4b are the ends of this band 4, and 5a and 5b are polymerized at the ends 4a and 4b of this band 4. The ends of the central band 5, 6 are provided on the panel front edge side of the central band 5 and are curved to cover the front edge of the panel 2, and 6a, 6b are the ends of the front edge 6. The provided front edge notch 7 is a side edge portion provided at the rear edge of the valve, that is, the rear edge of the central band 5, and covering the outer circumferential surface gap of the funnel portion 3 via a step portion 20 extending outward. That is, the skirt portion 11a.

Reference numeral 11b indicates side edge notches 8 provided at both ends of this side edge portion 7.
is a tension band that is wrapped around this metal band 4 and tightened.

As shown in FIG.
A, 4b, only the ends 5a, 5b of the flat central band are overlapped, and the front edge 6 and the side edge I including the step 20 are each a notch 5a.

6b, 7a*7b are formed, neither the inwardly curved front edge 6 nor the step 20 overlap.

Therefore, the end 4a of the metal band 4 on the upper side does not shift toward the front side of the panel, and the upper edge 1 of the front edge 6
0a is in close contact with the front edge of the panel 2.

Therefore, the reinforcing effect is good and the appearance is good.

Incidentally, in accordance with the present invention, the same effect as described above can be obtained by notching the side edges of the end portion of the metal band so that at least the stepped portions do not overlap.

Furthermore, the present invention is applicable not only to color picture tubes but also to all cathode tubes reinforced with metal bands.

In this way, the cathode ray tube of the present invention wraps a metal band having a front edge curved in the longitudinal direction and a stepped part around the outer circumferential surface of the bulb so that the ends overlap each other. In the case where the metal band is wrapped around the front edge and reinforced by tightening it with a tension band from above, the metal band does not overlap at least at the step part, and therefore, it is difficult to prevent the metal band from overlapping due to the shift of the overlapping part. Eliminates various defects such as the raised front edge.

[Brief explanation of drawings]

Figure 1 is a perspective view of an example of a conventional cathode ray tube, and Figure 2 is a perspective view of an example of a conventional cathode ray tube.
FIG. 3 is an enlarged perspective view of the main part shown in the dashed line frame ■ in the figure, FIG. Figure 5 is v-V of Figure 4.
It is a sectional view along the line. DESCRIPTION OF SYMBOLS 1... Valve, 2... Panel part, 3... Funnel part, 4... Metal band, 4a, 4b... Band end part, 6... Front edge part, 7... Side edge, 8... Tension band, 11a, 11b... Notch, 20...
・Danbe.

Claims (1)

[Scope of utility model registration request] A metal band having a step in the longitudinal direction and a front edge curved in the width direction is wrapped around the outer peripheral surface of the valve so that the ends overlap each other, and the front edge is attached to the front of the valve. Cover the edges, tighten the wrapped metal band with a tension band, and press the button on the reinforced cathode ray tube.
A cathode ray tube characterized in that the metal band has a notch to prevent the stepped portion and the front edge from overlapping.