JPH0610602Y2 - Explosion-proof CRT - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an explosion-proof type cathode ray tube.

[Conventional technology]

Regarding explosion-proof technology for cathode ray tubes, for example, magazines (Nati
onal Report Vol.25. No.2 Apr 1979, p.277-p.284), "Reinforcement technology for cathode ray tubes".

FIGS. 15, 16, and 17 show conventional explosion-proof cathode ray tubes. FIG. 15 is its front view, FIG. 16 is a plan view,
FIG. 17 is an elevational view including a partial sectional view. In the figure, (1) is a cathode ray tube, (2) is a panel, (2a) is a panel screen part, (2b) is a panel skirt part, (2c) is a panel edge part, (3) is a funnel, and (4) is two pairs. A set of rim bands covering the panel edge part (2c) and the panel skirt part (2b) respectively, (5) an adhesive agent that adheres the rim band (4), and (6) a tension band that winds and tightens the rim band. is there.

Next, the operation will be described. Rim band (4) is adhesive
Panel edge (2c) and panel skirt by (5)
It is completely bonded to (2b) and is integrated with the cathode ray tube (1), and is further tightened by a tension band (6) that winds the rim band (4).

In the explosion-proof type cathode-ray tube configured as described above, since the outward expansion of the cathode-ray tube due to the vacuum pressure is pressed by the tension of the tension band, the value of the stress distribution generated in the cathode-ray tube becomes small. Therefore, the possibility of implosion is reduced.

[Problems to be solved by the invention]

Since the conventional explosion-proof type cathode-ray tube is configured as described above, the force exerted by the tension band (6) causes a large compressive stress on the surface of the panel skirt portion (2b). However, the place where the largest tensile stress is generated on the outer surface of the cathode ray tube due to the vacuum pressure is the surface of the panel edge portion (2c). Therefore, the conventional explosion-proof type cathode ray tube has a problem that the tensile stress on the surface of the panel edge portion (2c) cannot be sufficiently reduced.

The present invention has been made to solve the above problems, and an object thereof is to obtain an explosion-proof type cathode-ray tube having high explosion-proof performance.

[Means for solving problems]

The explosion-proof type cathode ray tube of the present invention is a panel in which a panel skirt portion is connected to a panel screen portion through a panel edge portion, a funnel that is connected and sealed to the panel skirt portion, a rim band that covers the panel edge portion and the panel skirt portion, And a tension band for winding and tightening the rim band, the rim band portion covering the panel edge portion of the rim band is provided with a bulge portion, and the tension band is passed through the bulge portion so that a tightening force is generated in the panel edge portion. In addition, it is characterized in that it is provided in the bulge portion.

[Action]

In this invention, by winding the tension band around the bulging portion of the rim band, the surface pressure of the tension band is directly applied to the edge portion of the cathode ray tube. As a result, a large tensile stress generated in the panel edge portion at the time of vacuum pressure can be significantly reduced.

Further, the bulging portion increases the rigidity of the rim band and suppresses the deformation of the rim band due to an impact.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a front view showing an explosion-proof type cathode ray tube according to an embodiment of the present invention. 2 is an elevational view including a partial cross-sectional view of the same embodiment, and FIG. 3 is an enlarged cross-sectional view of the cross-sectional portion in FIG. And, FIG. 4 is a perspective view of one side of a pair of rim bands used in one embodiment of the present invention. In the figure, (1) is a cathode ray tube, (2) is a panel, (2a) is a panel screen part, (2b) is a panel skirt part, (2c) is a panel edge part, (3) is a funnel, and (4) is two pairs. The above-mentioned panel edge portion (2c) and panel skirt portion (2
The rim band that covers b), (5) the adhesive that attaches the rim band (4), (6) the tension band that winds and tightens the rim band (4), and (7) the panel that attaches the tension band (6). Panel edge part so that the tightening force is generated in the part (2c).
A bulge formed by bending the rim band in the vicinity of (2c) inward along the curvature of the panel edge portion (2c), bending the tip outward and further bending the tip outward, so as to have a triangular cross-sectional shape, ( Reference numeral 8) is a protruding portion which serves as a guide for the tension band (6) wound around the panel skirt portion (2b) side so that the rim band end portion on the panel skirt portion (2b) side protrudes outward.

That is, the rim band (4) is formed with a bulge (7) by bending so that the tension band (6) passes through the upper part of the panel edge part (2c). Furthermore, the rim band (4) has a protrusion (8) formed as a guide by bending so that the tension band (6) can be wound around the end of the panel skirt. This rim band (4)
Fully adhered to the cathode ray tube (1) with the adhesive (6),
A tension band (6) is wound around the panel edge portion (2c) upper portion and the panel skirt portion (2b) terminal upper end of the rim band (4).

In the explosion-proof cathode ray tube configured as described above,
The surface pressure of the tension band (6) exerts a large compressive stress on the surface of the panel edge portion (2c) against the large tensile stress generated on the surface of the panel edge portion (2c) under vacuum pressure. As a result, a large tensile stress generated on the surface of the panel edge portion (2c) can be significantly reduced. Also, by winding the tension band (6) around the end of the panel skirt (2b), the panel skirt (2
B) outward bulge can be suppressed. Furthermore, the bending rigidity of the rim band (4) is increased by forming the bulge (7) and the protrusion (8) on the rim band (4). As a result, it is possible to suppress the deformation of the panel skirt portion (2b) to the outside when a large impact is applied to the panel screen portion (2a).

In the above embodiment, the bulge portion (7) was formed so as to have a triangular sectional shape. However, as shown in the partial sectional view of another embodiment of the present invention in FIG. Even in the shape, the same effect as that of the above-described embodiment is obtained. Thus, the bulge portion has sufficient rigidity, and the shape of the bulge portion has, for example, one side parallel to the panel skirt surface and one side along the curvature of the panel edge portion (2c). .

Further, in the above embodiment, the bulge portion (7) was first bent inward along the curvature of the panel edge portion (2c), and the tip thereof was bent outward to form a bulge shape. FIG. 6 is a front view of an explosion-proof type cathode-ray tube according to another embodiment, FIG. 7 is an elevation view including a partial sectional view of the same embodiment, and FIG. 8 is an enlarged sectional view of a sectional portion in FIG. As shown in FIG. 9 of a perspective view of a rim band used in another embodiment of the present invention, the bulge portion (7) is bent inward from the place where the tension band (6) is placed, and the bulge portion is removed. Even if it is formed, the same effect as that of the above embodiment can be obtained.

Thus, in the above embodiment, the bulging portion (7) and the protruding portion (8) were formed by bending the rim band (4), but another embodiment of the present invention shown in FIG. As shown in the partial cross-sectional view of the rim band, the bulge (7) and the protrusion (8) are
The same effect as that of the above-described embodiment can be obtained by forming it separately from (4) and connecting them by welding or the like. Furthermore, in the case of the one shown in FIG.
Since the solid body filled with contents is used for (7), the rigidity is further increased and the effect can be increased.

An explosion-proof cathode ray tube according to still another embodiment of the present invention is shown in FIGS. 11 to 14 in a partial sectional view of still another embodiment of the present invention. These are reinforcing members (9) put in the hollow part of the bulge part of the hollow body in the above-mentioned example, or those in which the reinforcing members are put in the hollow body are joined together later, and as a reinforcing member (9) A resin or a metal brazing material is used.

As for the material used for the reinforcing material (9), the rigidity of the rim band becomes larger and the hardening increases when the hollow material reaches every corner and shows high strength after hardening. In this case, the reinforcing material (9) further increases the rigidity of the rim band.

Further, in the above embodiment, the effect can be increased by increasing the number of turns of the tension band (6). Further, the effect can be increased by bringing the position of the tension band (6) above the panel edge (2c) of the above-mentioned embodiment toward the outer side of the bulge portion (7).

Although the rim band is provided with the bulge and the protrusion in the above embodiment, the intended purpose can be achieved by using the rim band provided with only the bulge.

[Effect of device]

As described above, the present invention has a panel screen part, a panel in which panel skirt parts are connected via a panel edge part, a funnel that is connected to the panel skirt part and sealed, a rim band that covers the panel edge part and the panel skirt part, And a tension band for winding and tightening the rim band, the rim band portion covering the panel edge portion of the rim band is provided with a bulge portion, and the tension band is passed through the bulge portion so that a tightening force is generated in the panel edge portion. In addition, an explosion-proof type cathode-ray tube having high explosion-proof performance can be obtained by using the one characterized by being provided in the bulge portion.

[Brief description of drawings]

FIG. 1 is a front view showing an explosion-proof type cathode ray tube according to an embodiment of the present invention, FIG. 2 is an elevational view including a partial sectional view of this embodiment, and FIG. 3 is an enlarged sectional view of FIG. Cross section,
FIG. 4 is a perspective view of a rim band used in this embodiment, and FIG.
FIG. 7 is a partial sectional view of an explosion-proof type cathode-ray tube according to another embodiment of the present invention, FIG. 6 is a front view of an explosion-proof type cathode-ray tube according to another embodiment of the present invention, and FIG. 7 is a partial sectional view of this example. The elevation view including FIG. 8, FIG. 8 is an enlarged sectional view of the sectional portion in FIG. 7, and FIG. 9 is a perspective view of the rim band used in this embodiment.
FIG. 10 is a partial sectional view of an explosion-proof cathode ray tube according to another embodiment of the present invention, FIGS. 11 to 14 are partial sectional views of an explosion-proof cathode ray tube according to still another embodiment of the present invention, and FIG. FIG. 16 is a front view of the explosion-proof type cathode ray tube, FIG. 16 is a plan view thereof, and FIG. 17 is an elevation view including a partial cross-sectional view. In the figure, (2) is a panel, (2a) is a panel screen part, (2b) is a panel skirt part, (2c) is a panel edge part,
(3) is a funnel, (4) is a rim band, (6) is a tension band, and (7) is a bulge. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Scope of utility model registration request] 1. A panel in which a panel skirt portion is connected to a panel screen portion through a panel edge portion, a funnel connected to the panel skirt portion and sealed, a rim band covering the panel edge portion and the panel skirt portion, and the rim band. In the one provided with a tension band that winds and tightens, while providing a bulge part in the rim band part that covers the panel edge part of the rim band,
An explosion-proof type cathode-ray tube, wherein the tension band is provided on the bulging portion so that a tightening force is generated on the panel edge portion through the bulging portion. 2. The explosion-proof type cathode ray tube according to claim 1, wherein the rim band is provided with a projecting portion projecting to the outside of the rim band in a portion covering the panel skirt portion. 3. The explosion-proof type cathode ray tube according to claim 1 or 2, wherein the bulge is a hollow body. 4. The explosion-proof cathode ray tube according to claim 1 or 2, wherein the bulge is filled with a reinforcing material. 5. The explosion-proof type cathode ray tube according to claim 1 or 2, wherein the bulge is a solid body.