KR100321652B1 - Cathode-ray tube having an implosion protection band with mounting lugs - Google Patents

Abstract

The cathode ray tube 10 includes an exhausted 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-shock wave band 32 having both ends fixed to each other is wound around four sides of the panel. The anti-shock band only includes three support lugs 34, 38, 40 attached to the band. Two lugs 38 and 40 of the supporting lugs are disposed at both ends of one long side of the long side 20 of the panel, and the other lug 34 is disposed at the center of the other long side 22 of the panel. do. The lugs arranged at the center fix both ends of the band to each other.

Description

Cathode ray tube with implosion-proof band with support lug {CATHODE-RAY TUBE HAVING AN IMPLOSION PROTECTION BAND WITH MOUNTING LUGS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube having an anti-shock band, and more particularly to a cathode ray tube having an anti-shock band having a supporting lug.

As the cathode ray tube is evacuated to a very low internal pressure, there is a possibility of implosion due to the stress generated by the atmospheric pressure acting on the surface of the cathode ray tube. Conventionally, this implosion problem was solved by providing a cathode ray tube with an implosion prevention band for applying a compressive force to the side wall panel of the cathode ray tube and redistributing part of the stress. This redistribution of stress reduces the likelihood of implosion in the cathode ray tube by minimizing the tension at the edges of the panel. In addition, the anti-shock band is advantageous because it improves the impact resistance of the cathode ray tube.

There are many kinds of such anti-shock bands. One of them is a shrinkfit band, which is usually formed by forming a metal strip into a loop having the same shape as the faceplate panel and joining the two ends of the loop over one side of the panel. The inner circumference of the loop is slightly smaller than the outer circumference of the faceplate panel, so that the loop can be heated to about 300 ° C to 500 ° C to expand and slide along the side of the faceplate panel. The band shrinks as it cools and winds up the panel tightly, thereby applying the necessary anti-shock compression force to the faceplate panel. Since the band is used to apply substantial pressure to the cathode ray tube sidewalls, the connection between the two ends of the band must be strong enough to withstand the tension applied to the band. Both ends of the band loop are usually permanently joined by welding and pressing.

Currently, the majority of cathode ray tubes are attached in a cabinet by four support lugs welded to the anti-shock bands at the four corners of the cathode ray tube. A typical lug consists of two L-shaped flanges, of which a first flange is welded to the band, the second flange including an opening to facilitate attachment to the cabinet. Ideally, the second flanges of the four support lugs should be coplanar. Television receiver and display monitor manufacturers hope that the attachment location lies within a tolerance of 1 mm from the actual coplanarity. This coplanar tolerance is very difficult to achieve with four lugs.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a cathode ray tube having an anti-shock band capable of satisfying a target strength criterion while providing a support lug in the same plane.

According to the invention, the cathode ray tube comprises an exhausted envelope having a square faceplate panel coupled to a funnel. The panel has two long sides and two short sides. An anti-shock band fixed at both ends is wound around four sides of the panel. The anti-shock band includes only three support lugs attached thereto. Two of the supporting lugs are disposed at both ends of one long side of the long side of the panel, and the other lug is disposed at the center of the other long side of the panel. A lug disposed at the center of the other long side fixes both ends of the band.

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

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

3 is a perspective view showing an axial lug.

4 is a front view of the lug 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 lug of FIG. 3.

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

10: cathode ray tube

12: envelope

14: faceplate panel

16: visible faceplate panel

18: panel sidewall

20, 22: long side

24, 26: short side

30: neck

32: shockproof clamp band

34, 38, 40: support lug

42, 44: flange

46: opening

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.

In FIGS. 1 and 2, the cathode ray tube 10 includes an exhausted envelope 12 having a faceplate panel 14, the faceplate panel 14 having a barbed periphery surrounded by a sidewall 18. The face plate 16 is included. The face plate panel 14 has a rectangular shape and includes two parallel long sides 20 and 22 and two parallel short sides 24 and 26. The panel sidewall 18 is coupled to a large end of the funnel 28, the small end of the funnel being closed by a neck 30 having an electron gun (not shown), and the anti-shock clamp band 32 ) Winds up the side wall 18.

The implosion-proof clamp band 32 is a steel loop formed by joining both ends to each other. In this embodiment, the support lug 34 is used with both ends of the steel loop as connection elements. In addition, the band includes a peripheral fold so that at least a portion has twice the thickness, or the band 32 need not be folded 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. Two support lugs 38 and 40 disposed at both ends of the long side 20 are attached to the band 32, and the support lug 34 disposed at the center of the long side 22 is the band 24. Secure both ends of).

The supporting lugs 34 are shown in detail in the accompanying figures.

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

The support lugs are usually made of a material different from the implosion resistant bands, for example the bands are made of special killed steel and the lugs can be made of stainless steel. According to the present invention, the support lug 34 is preferably made of the same type of material as the material used for the anti-shock band 32. This is inexpensive compared to the use of stainless steel, and enables better welding between the same materials. The other two lugs 38 and 40 can be standard lugs as used in the prior art.

By using three support lugs instead of four lugs as described above, the flange having three openings of the three lugs can easily form the same plane because three points form a plane, such as one plane. Can be. Typically the band 32 is about 25.4 mm to 76.2 mm (1 to 3 inches) wide and about 1.07 mm to 1.4 mm (0.042 to 0.055 inches) thick. In one embodiment, the support lug 34 is about 84.58 mm (3.33 inches) long, 2.29 mm (0.09 inches) thick, and the widths of the flanges 42 and 44 are each about 39 mm (1.54 inches) wide. )to be.

Although the present invention has shown a cathode ray tube using an implosion-proof clamp band as an example, it can be understood that the present invention can be applied to a cathode ray tube having another type of implosion prevention band.

As described above, the present invention has an effect of satisfying a target strength criterion by providing an anti-shock band including three support lugs in the same plane.

Claims (4)

An exhausted 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 the cathode ray tube including the implosion-proof band 32 is fixed to both ends surrounding the four sides of the panel, The implosion resistant band comprises only three support lugs (34, 38, 40) attached to the band. The cathode ray tube according to claim 1, wherein one of the support lugs connects both ends of the band to each other. 2. The support of claim 1 wherein two of the support lugs (38, 40) are disposed across one long side (20) of the panel, and one of the lugs (34) is the other long side (22) of the panel. Cathode ray tube that is disposed in the center of the. 4. A cathode ray tube according to claim 3, wherein said centrally placed support lug (34) secures both ends of said band to each other.