JPH05182603A - Explosion-proof type cathode-ray tube - Google Patents

Abstract

PURPOSE:To eliminate spot-welding and a plate by hooking and fixing both hook-like ends of a shrink band. CONSTITUTION:Hook-like projections 9, 9 formed on both ends of a band 4 are hooked and fixed to constitute a shrink band 7. Thereby, the shrinkage force can be preserved at the hooking connection part. Same effect can be obtained by forming the hook-like projections in the up and down direction. Furthermore, an explosion-proof type cathode-ray tube can be maintained with the shrinkage force of the band 7 and a ring, by fixing face to face the L-shaped projection formed on both ends of the band 4 by the use of the ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved explosion-proof type cathode ray tube that prevents implosion.

[0002]

2. Description of the Related Art FIG. 31 shows, for example, Japanese Utility Model Publication No. 62-51644.
32 is a side view showing an example of the conventional explosion-proof type cathode-ray tube disclosed in Japanese Patent Laid-Open Publication No. Gazette, FIG. 32 is an enlarged view showing a connecting portion of the elastic band of FIG. 31, and FIG. 33 is a side view of FIG. In the figure, 1
Is a panel, 1a is a panel skirt portion, 1b is a panel face, 2 is a funnel, and 3 is a neck, each made of glass. 4 is a band and 5 is a plate. Both ends of the band 4 are joined to the plate 5 via spot welds 6 to form an annular tightening band 7. The tightening band 7 surrounds the panel skirt portion 1a and is tightened with a predetermined strength. Reference numeral 8 is a mounting member fixed to the band 4.

Next, the operation will be described. The cathode ray tube is used with a vacuum inside, and stress is generated in the cathode ray tube due to the difference in internal and external atmospheric pressure. The circumference of the elastic band 7 is shorter than the circumference of the panel skirt 1a at room temperature, and becomes longer than the circumference of the panel skirt 1a when heated and stretched. The contraction force caused by the contraction causes the outer peripheral surface of the panel skirt portion 1a to be contracted. The contraction force of the compression band 7 reduces the stress of the Braun tube, and the effect of preventing the implosion of the Braun tube is obtained.

[0004]

Since the conventional explosion-proof type cathode ray tube is constructed as described above, it is necessary to increase the tightening force in order to prevent the implosion. However, the conventional tightening band 7 described above is used. However, there was a problem in that sufficient stringency could not be obtained with the configuration.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an explosion-proof type cathode-ray tube whose explosion-proof performance can be improved by a tightening band capable of obtaining a large tightening force.

[0006]

The explosion-proof type cathode-ray tube according to the present invention is a tightening band for supporting a tightening force, in which both ends thereof are formed in a hook shape and the hook-shaped both ends are hooked and fixed. is there. Further, both ends of the elastic band are bent in an L-shape, the L-shaped ends are butted, and a ring is fitted into the butted portion to be fixed. Further, scissors for sandwiching the plate are provided at both ends of the elastic band, and the plates are sandwiched by the scissors at both ends to widen the welding area.
Further, a groove is provided on the adhesive surface of the elastic band. Further, the rigidity of the portion of the rim band mounted inside the elastic band which contacts the corner portion of the front panel is reduced. In addition, a spacer formed by molding a metal plate into a flat ring shape is installed between the elastic band and the cathode ray tube.

[0007]

In the present invention, the hook-shaped ends of the elastic band are hooked and fixed to eliminate the need for spot welding and a plate. Also, by spotting the L-shaped ends of the tightening band and fitting and fixing the fixing ring, spot welding work and plate are not required. In addition, since the welding area of the elastic band is increased, the tensile strength of the joint portion of the band can be significantly increased. In addition, since the groove is formed on the adhesive surface of the elastic band, the adhesive area is wider than when the adhesive surface is flat and the adhesive force is increased, and the effect of preventing the band from shifting due to the engagement by the groove is obtained. .. Moreover, since the rigidity of the corner portion of the rim band mounted inside the elastic band is low, the rim band and the CRT are brought into close contact with each other by the tension of the elastic band when wound around the elastic band. Further, by installing the spacer formed by molding the metal plate into a flat ring shape, it is possible to uniformly apply a larger compressive force around the cathode ray tube.

[0008]

【Example】

Example 1. Hereinafter, an embodiment of the invention according to claim 1 will be described with reference to FIG.
2 will be described. FIG. 1 is a view showing a connecting portion of a tightening band, and FIG. 2 is a side view of FIG. 1. The same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof is omitted. In the figure, 9 and 9 are hook-shaped projections formed on both ends of the band 4, and the elastic band 7 is constructed by hooking and fixing the hook-shaped projections 9 and 9. In this way, by providing the hook-shaped projections 9, 9 on both ends of the band 4 and hooking them, the tightening force of the tightening band 7 can be maintained at the hooking and connecting portions. Therefore, the spot welding process and the plate which are required to maintain the stringent force, which have been conventionally performed, are not required, and the strength of the joint portion is increased to improve the explosion-proof performance.

Example 2. In the above-mentioned Example 1, the stringency band 7
Although the hook-shaped projections 9 and 9 are formed in the lateral (horizontal) direction of the hook-shaped projection 9 as shown in FIGS.
The same effect can be obtained by forming A and 9A in the vertical (up and down) direction.

Embodiment 3. Further, similar effects can be obtained by using the hook-shaped projections 9B and 9B as shown in FIGS. The hook-shaped projection 9B is formed by bending the shape shown in FIG. 7 at the fold line 9a to form the shape shown in FIG.

Embodiment 4. In the first embodiment described above, the hook-shaped projection 9 has the tip end portion stacked one by one. However, as shown in a representative example in FIG. 9 and FIG.
In the case of stacking the sheets, the area of the portion that maintains the tightening force, that is, the area of the tip portion of the hook-shaped projection 9C is doubled, and as a result, the tightening force is doubled.

Embodiment 5. 11 is a view showing a joint portion of a tightening band according to an embodiment of the invention according to claim 2, FIG. 12 is a side view of FIG. 11, and the same or corresponding parts as those of the conventional one are designated by the same reference numerals. The description is omitted. In the figure, 10 and 10 are L-shaped projections formed on both ends of the band 4, and 11 is a fixing ring for fixing the L-shaped projections 10 and 10 that are abutted to each other. In this way, the L-shaped projections 10, 10 at both ends of the band 4 are butted against each other and fixed by the fixing ring 11, so that the tightening force of the tightening band 7 can be maintained by the fixing ring 11. Therefore, the spot welding process and the plate which are required to maintain the stringent force, which have been conventionally performed, are not required, and the strength of the joint portion is increased to improve the explosion-proof performance. In addition, FIG. 13 shows an L-shaped projection 10 formed at the end of the band 4.
It is a perspective view showing.

Embodiment 6. FIG. 14 is a perspective view showing a connecting portion of an elastic band according to an embodiment of the invention according to claim 3, FIG.
FIG. 16 is a view showing a state before the plate is inserted, and FIG. 16 is a sectional view taken along line XVI-XVI in FIG. 14. The same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numerals 12 and 12 denote scissors formed at both ends of the band 4 and have a size capable of sandwiching the plate 5. The plate 5 is put in a position before the plate is sandwiched, the scissors 12 of the band 4 are bent, and the plate 5 is sandwiched. In this state, the spot welded portions 6 are joined by spot welding. Therefore, the strength of the band connecting portion is increased due to the larger welding area than the conventional one, and the explosion-proof performance is improved. Further, there is an advantage that the bonding surface of the joint portion becomes flat.

Example 7. In the sixth embodiment, the scissors 12 and 1 for sandwiching the plate 5 in order to widen the welding area.
2 is shown, the spot welding points can be increased even if the weldable area is increased by providing the enlarged portions 13 and 13 at both ends of the band 4 as shown in FIGS. Thus, the same effect as that of the sixth embodiment can be obtained.

Example 8. 19 is a partially broken perspective view showing an embodiment of the invention according to claim 5, and FIG. 20 is a portion of FIG.
It is an enlarged view of XX, and the same or corresponding portions as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure,
Reference numeral 14 denotes a groove provided on the adhesive surface 7a of the elastic band 7, and the corner portion of the groove is rounded so that stress is not concentrated. 15
Is an adhesive or an adhesive tape. If the small groove 14 is provided in the direction perpendicular to the band direction of the elastic band 7, that is, in the axial direction of the cathode ray tube, the groove 14 expands the contact area with the adhesive or the adhesive tape 15 and increases the adhesive force. Therefore, the explosion-proof performance is improved. At this time, since the groove 14 is provided in the axial direction of the CRT, it is possible to prevent the tightening band from being displaced in the circumferential direction of the CRT.

Embodiment 9. Although the groove 14 is provided in the axial direction of the cathode ray tube in the eighth embodiment, the groove 14A may be provided in the circumferential direction of the cathode ray tube as shown in FIG. In this case, the axial displacement of the elastic band 7 of the cathode ray tube can be prevented.

Embodiment 10. Further, as shown in FIG. 22, if the groove 14B is formed by intersecting the grooves, the overall deviation of the cathode ray tube can be prevented, so that the effect is further increased.

Embodiment 11. The same effect can be obtained not only by arranging the grooves as shown in Examples 8 to 10 but also by changing the shape of the grooves to grooves 14C and 14D having other shapes as shown in FIG.

Embodiment 12. Further, by disposing the groove 14 locally at the corner portion of the cathode ray tube as shown in FIG. 24, it is possible to more effectively prevent the displacement of the elastic band 7.

Example 13. FIG. 25 is a partially broken perspective view showing an embodiment of the invention according to claim 6, and FIG. 26 is an enlarged view showing a main part of FIG. 25. The description is omitted. In the figure, 16 is a rim band to be mounted inside the austerity band 7, which is a front sloping portion 16a contacting the periphery of the panel face 1b.
have. Reference numeral 17 is a notch provided in a corner portion of the front hanging portion 16a. A CRT with such a structure
First, the adhesive 15 is applied to the inner surface of the side surface of the rim band 16, and then the rim band 16 is mounted.
A tight band 7 having a predetermined tension is wound around the outer circumference of the panel to form the panel skirt portion 1a of the CRT and the rim band 1.
6, and the panel skirt 1a is subjected to a compressive force. If the notch 17 is provided at the corner portion of the front sloping portion 16a of the rim band 16, the rim band 16 is easily deformed because the rigidity of the corner portion is low, and the tension of the tightening band 7 strengthens the rim band 16 and the glass bulb. And it can be made to adhere uniformly. Therefore, the explosion-proof performance can be improved.

Example 14 In the thirteenth embodiment, the notch 17 is inserted in the corner portion of the front hanging portion 16a to reduce the rigidity. However, as shown in FIG. 27, the thickness of the corner portion of the front hanging portion 16a should be thin. However, the same effect can be obtained.

Example 15 Further, as shown in FIG. 28, even if the slit 18 is provided at the corner portion of the front hanging portion 16a to reduce the rigidity, the same effect as that of the above-described thirteenth embodiment can be obtained.

Example 16 FIG. 29 is a front view showing an embodiment of the invention according to claim 7, and the same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted. In the figure, 19 is a spacer formed by molding a metal plate into a flat ring shape. Next, the operation will be described. When a vacuum is applied to the cathode ray tube, a large tensile stress is generated along the outer peripheral direction of the cathode ray tube. As a result, cracks may occur particularly at the corners where the tensile stress is concentrated, and implosion may occur. Therefore, the elastic band 7 is wound around the cathode ray tube to apply a circumferential compressive force to the outer peripheral portion of the cathode ray tube to relieve the tensile stress and to provide an effect of preventing implosion. However, if the tightening force of the elastic band 7 is increased to apply a high compressive force, stress concentrates on the corners of the cathode ray tube, which may increase the risk of implosion. Therefore, it is necessary to apply a uniform compressive force to the sides of the cathode ray tube, and a spacer 19 formed by molding a metal plate into a flat ring shape is installed between the cathode ray tube and the tightening band 7 so that the cathode ray tube is evenly compressed. Generates a compressive stress. That is, the spacer 19 formed by molding a metal plate into a flat ring shape is deformed by tightening the elastic band 7, and its spring force generates an even compressive stress distribution in the side portion of the cathode ray tube, thereby optimally performing implosion. It can be prevented.

Example 17 FIG. 30 shows another embodiment of the spacer, and the spacer 19A of this embodiment is formed by bending a metal plate. By using the spacer 19A in which the metal plate is curved as described above, the same effect as that of the sixteenth embodiment can be obtained.

[0025]

As described above, according to the present invention, it is possible to obtain the effect that the explosion-proof performance can be improved by the tightening band capable of obtaining a large tightening force.

[Brief description of drawings]

FIG. 1 is a diagram showing a binding portion of a stringent band in Example 1 of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a diagram showing a binding portion of a stringent band in Example 2 of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a diagram showing a binding portion of a stringent band in Example 3 of the present invention.

FIG. 6 is a side view of FIG.

FIG. 7 is a diagram showing a state before the hook-shaped protrusions of FIG. 5 are bent.

FIG. 8 is a diagram showing a state after the hook-shaped protrusions of FIG. 5 are bent.

FIG. 9 is a diagram showing a binding portion of a stringent band in Example 4 of the present invention.

FIG. 10 is a side view of FIG. 9.

FIG. 11 is a diagram showing a binding portion of a stringent band in Example 5 of the present invention.

FIG. 12 is a side view of FIG. 11.

13 is a perspective view showing the L-shaped projection of FIG. 11. FIG.

FIG. 14 is a perspective view showing a connecting portion of a tightening band according to Embodiment 6 of the present invention.

FIG. 15 is a diagram showing a state before the plate is sandwiched.

16 is a cross-sectional view taken along the line XVI-XVI of FIG.

FIG. 17 is a perspective view showing a connecting portion of a tightening band according to Embodiment 7 of the present invention.

FIG. 18 is a side view of FIG.

FIG. 19 is a partially cutaway perspective view showing Embodiment 8 of the present invention.

20 is an enlarged view of a portion XX of FIG.

FIG. 21 is a partially cutaway perspective view showing Embodiment 9 of the present invention.

FIG. 22 is a partially cutaway perspective view showing Embodiment 10 of the present invention.

FIG. 23 is a partially cutaway perspective view showing Embodiment 11 of the present invention.

FIG. 24 is a partially cutaway perspective view showing Embodiment 12 of the present invention.

FIG. 25 is a partially cutaway perspective view showing Embodiment 13 of the present invention.

FIG. 26 is an enlarged view showing a main part of FIG. 25.

FIG. 27 is a partially cutaway perspective view showing Embodiment 14 of the present invention.

FIG. 28 is a partially cutaway perspective view showing Embodiment 15 of the present invention.

FIG. 29 is a front view showing Embodiment 16 of the present invention.

FIG. 30 is a front view showing Embodiment 17 of the present invention.

FIG. 31 is a side view showing a conventional explosion-proof type cathode ray tube.

32 is an enlarged view showing a binding portion of the stringent band in FIG. 31. FIG.

FIG. 33 is a side view of FIG. 32.

[Explanation of symbols]

 1 panel 1a panel skirt part 1b panel face 2 funnel 3 neck 4 band 5 plate 6 spot welded part 7 tightening band 9 hook-shaped protrusion 10 L-shaped protrusion 11 ring 12 scissors 13 enlarged part 14 groove 15 adhesive 16 rim band 17 notch 18 Slit 19 Spacer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Takada 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Laboratory (72) Inventor Tatsuya Miyashita 6-16-1, Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Engineering Co., Ltd. Itami Works (72) Inventor Masahiro Ohno 6-16-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Engineering Co., Ltd. Itami Works (72) Inventor Takami Aota 8-1-1 Tsukaguchi Honmachi, Amagasaki Mitsubishi Electric Central Research Institute Co., Ltd. (72) Inventor Hayato Nishinakagawa 6-16-1, Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Engineering Co., Ltd. Itami Works (72) Inventor Masato Iwaoka 6-16-1, Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Engineering Co., Ltd. Itami Works

Claims (8)

[Claims] 1. An explosion-proof cathode ray tube having an elastic band for supporting a stringent force, wherein both ends of the elastic band are hook-shaped and the hook-shaped ends are hooked and fixed. .. 2. An explosion-proof type cathode-ray tube having a tightening band for supporting a tightening force, wherein both ends of the tightening band are bent into L-shapes, and both ends of the L-shape are butted and fixed by fitting a ring into the butted portion. Explosion-proof type cathode ray tube characterized by doing so. 3. An explosion-proof type cathode ray tube having a tightening band for supporting a tightening force, wherein scissors for sandwiching the plate are provided at both ends of the tightening band, and the plate is sandwiched between the both ends to widen the welding area. Explosion-proof type cathode ray tube characterized by 4. An explosion-proof type cathode-ray tube having an elastic band for supporting a tightening force, wherein enlarged portions are provided at both ends of the elastic band to widen a weldable area. 5. An explosion-proof type cathode-ray tube comprising an elastic band for supporting an elastic force, wherein an adhesive surface of the elastic band is provided with a groove. 6. An explosion-proof type CRT equipped with a tightening band for supporting a tightening force, having a rim band mounted inside the tightening band, and reducing rigidity of a portion of the rim band in contact with a front panel corner portion. Explosion-proof type cathode ray tube characterized by 7. An explosion-proof type cathode-ray tube having a tightening band for supporting a tightening force, wherein a spacer formed by molding a metal plate into a flat ring shape is provided between the tightening band and the cathode-ray tube. Explosion-proof type cathode ray tube. 8. An explosion-proof cathode ray tube comprising an explosion-proof type cathode-ray tube equipped with a tightening band for supporting an elastic force, wherein a spacer formed by bending a metal plate is provided between the tightening band and the cathode-ray tube.