KR19990088359A - Cathode-ray tube having an implosion protection band with mounting lugs - Google Patents

Abstract

The cathode ray tube 10 includes an exhaust envelope 12 having a square faceplate panel 14 coupled to the funnel 28. The panel has two long sides 20, 22 and two short sides 24, 26. An anti-rupture band 32 having opposing ends fixed together encircles the panel at four sides of the panel. The tear rupture band includes three support protrusions 34, 38, 40 attached to the band. Preferably, two projections 38, 40 of the support projections are located at the end of one long side of the long side 20 of the panel, and the other projection 34 is the center of the remaining long side 22 of the panel. Is located in. The centrally located protrusion fixes together the opposite ends of the band.

Description

Cathode ray tube with a bursting prevention band having a supporting projection {CATHODE-RAY TUBE HAVING AN IMPLOSION PROTECTION BAND WITH MOUNTING LUGS}

The present invention relates to a cathode ray tube having a burst preventing band, and more particularly to a cathode ray tube having a burst preventing band having a support protrusion.

Because cathode ray tubes are exhausted at very low internal pressures, they are prone to rupture due to stress generated by atmospheric pressure acting on the surface of cathode ray tubes. This rupture problem has been solved by the prior art of installing a rupture preventing band in the cathode ray tube which redistributes part of the stress by applying pressure to the side wall of the faceplate panel of the cathode ray tube. This redistribution of stress reduces the potential for tearing of the cathode ray tube by minimizing tension at the edges of the panel. In addition, the bursting band is advantageous because it improves the impact resistance of the cathode ray tube.

There are many types of such bursting prevention bands. One type is a shrinkfit band, which is typically constructed by forming a loop with the same shape as a faceplate panel with a stream of steel, with the two ends of the loop being one side of the panel. Combined in phase. The inner circumference of the loop is slightly smaller than the outer circumference of the faceplate panel, and the loop is heated in the range of about 300 ° C to 500 ° C, at which temperature the loop expands to slide along the side of the faceplate panel. Then, the band contracts upon cooling to tightly surround the panel, thereby applying the necessary bursting compression to the faceplate panel. Since the band is used to apply great pressure to the cathode ray tube sidewalls, the connection between the band ends must be strong enough to withstand the tension applied to the band. The ends of the band loops are usually permanently joined by welding and crimping.

Nowadays, most cathode ray tubes are supported in a cabinet by four support protrusions welded to the tear-resistant band at four corners of the cathode ray tube. A typical protrusion has an L-shape and has two flanges, a first flange of which is welded to the band, and a second flange including an aperture facilitates attachment to the cabinet. Ideally, the second flange of the four support protrusions should be located on the same plane. Television receivers and display monitor manufacturers hope that the support position lies within the actual coplanarity and 1 mm tolerance. This coplanar tolerance is very difficult to achieve with four projections.

An object of the present invention for solving the above problems is to provide a cathode ray tube having a burst preventing band that can satisfy the required strength criteria while providing a support projection of the same plane.

According to the invention, the cathode ray tube comprises an exhaust envelope with a square faceplate panel coupled to a funnel. The panel has two long sides and two short sides. An anti-rupture band, with the opposite ends fixed together, surrounds the panel on four sides of the panel. The tear rupture band includes only three support protrusions attached thereto. Two of the support protrusions are located at the end of one long side of the long side of the panel, and the other one is located at the center of the other long side of the panel. The projection located at the center of the other long side fixes the opposite ends of the band together.

1 is a side view of a cathode ray tube according to the present invention;

2 is a front view of the cathode ray tube of FIG. 1;

3 is a perspective view of an axial protrusion;

4 is a front view of the protrusion of FIG. 3;

5 is a cross-sectional view taken along the line 5-5 shown in FIG.

6 is a plan view of the protrusion of FIG. 3;

<Description of the symbols for the main parts of the drawings>

10: cathode ray tube

12: exhaust envelope

14: faceplate panel

16: viewing plate panel

18: panel sidewall

20, 22: long side

24, 26: short side

30: neck

32: shrink fit burst protection band

34, 38, 40: support protrusion

42, 44: flange

46: aperture

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view of a cathode ray tube according to the present invention, Figure 2 is a front view of the cathode ray tube of FIG.

1 and 2, the cathode ray tube 10 includes an exhaust envelope 12 having a face plate panel 14, the face plate panel 14 having a periphery of a viewing face plate surrounded by side walls 18. 16) is included. The face plate panel 14 has a rectangular shape and includes two long sides 20 and 22 in parallel and two short sides 24 and 26 in parallel. The panel side wall 18 is coupled to a large end of the funnel 28, the small end of the funnel being closed by a neck 30 that holds an electron gun (not shown), preventing shrinkage fit rupture Band 32 surrounds sidewall 18.

The shrink fit rupture preventing band 32 is a steel loop formed by joining opposite ends to each other. In this embodiment, the support protrusion 34 is used as an element connecting the ends of the steel loops. The band may also include a peripheral folded portion that provides at least twice the thickness at least in part, or may not be grounded as shown in FIGS. 1 and 2. The band 32 includes a plurality of openings 36 for attaching a degaussing coil to the cathode ray tube. In addition, two support protrusions 38 and 40 positioned at both ends of the long side 20 are attached to the band 32, and the support protrusion 34 positioned at the center of the long side 22 is the band ( Both ends of 32 are firmly supported.

3 to 6, the support protrusion 34 is shown in detail.

The protrusion 34 includes two flanges 42 and 44 which are vertically coupled to each other, one of which is attached to both ends of the band 32. The other flange 44 has an aperture 46 and extends in a direction away from the cathode ray tube to provide a means for attachment in the cabinet.

The support protrusion is usually made of a material different from the tear-resistant band, for example the band may be made of special steel, and the protrusion may be made of stainless steel. According to the present invention, the support protrusion 34 is preferably made of the same type of material as the material used for the rupture preventing band 32. This can lower costs compared to using stainless steel, and also facilitates welding between homogeneous materials. The other two protrusions 38 and 40 will be standard protrusions as is clearly used in the art.

By using three support protrusions instead of four protrusions as described above, the same flange can be formed because three flanges on which the apertures of the three protrusions form a plane, as three points form a plane. . Typically the width of the band 32 is from about 25.4 mm to 76.2 mm (1 to 3 inches) and the thickness is from about 1.07 mm to 1.4 mm (0.042 to 0.055 inches). In one embodiment, the length of the support protrusion 34 is about 84.58 mm (3.33 inches), the thickness is 2.29 mm (0.09 inches), and the width of the flanges 42 and 44 is about 39 mm (1.54 inches) respectively. to be.

Although the invention is presented in the examples of a cathode ray tube using a shrink fit burst tear band as described above, the invention is of course also applicable to cathode ray tubes having other types of tear break bands.

As described above, the present invention has the effect of satisfying the required strength standard by providing a tear preventing band having three support protrusions on the same plane.

Claims (4)

An exhaust envelope 12 coupled to the funnel and having a rectangular faceplate panel 14 having two long sides 20, 22 and two short sides 24, 26; In a cathode ray tube having opposite ends fixed together and comprising an anti-rupture band 32 surrounding the panel at four sides of the panel, Cathode ray tube, characterized in that only three support protrusions (34, 38, 40) are attached to the bursting prevention band. The cathode ray tube according to claim 1, wherein one of the supporting protrusions (34) joins opposite ends of the band together. 2. The projection of claim 1, wherein two projections (38, 40) of the support projections are located at an end of one long side of the long side (20) of the panel, and the other projection (34) is the remaining long side (22) of the panel. Cathode ray tube is located in the center of the). 4. A cathode ray tube according to claim 3, wherein said centrally located support protrusion (34) fixes together opposite ends of said band.