JP2004303611A - Cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cathode-ray tube provided with a high shock-resistant property by applying a sure reinforcement by using a reinforcing band of which fluctuation of fastening force is reduced. <P>SOLUTION: A reinforcing band 2 is attached so as to fasten an outer circumferential surface of a panel part 1P of the cathode-ray tube. A recess part 25 avoiding or relaxing a mold match line 11 from contacting with the reinforcing band 2 is formed over a whole periphery of the reinforcing band 2 at a position corresponding to the mold match line 11 on the outer circumferential surface of the panel part 1P which is an inner peripheral surface facing the outer circumferential surface of the panel part 1P of the reinforcing band 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cathode ray tube to which a reinforcing band for fastening an outer peripheral surface of a panel portion of a cathode ray tube is attached.
[0002]
[Prior art]
In general, as shown in a schematic side view of FIG. 5, a cathode ray tube of various picture tubes such as a television and a display device has a cathode ray tube 1 composed of a panel portion 1P, a funnel portion 1F, and a neck portion 1N. Is provided. The panel portion 1P has a front panel 1Pf having an inner surface coated with a fluorescent screen (not shown) and a skirt portion 1Ps extending rearward from the periphery along the tube axis direction by glass molding to be integrally formed. It becomes. Then, after the skirt portion 1Ps and the funnel portion 1F are joined together via the frit glass at the joining portion 7, the cathode ray tube 1 having airtightness is obtained by being sealed and evacuated.
[0003]
By the way, since the inside of the cathode ray tube 1 is maintained at a high vacuum, the cathode ray tube 1 is constantly given an external pressure by the atmospheric pressure. In particular, a stress acts on the front panel portion 1Pf so as to cause dent deformation (hereinafter referred to as “vacuum distortion”) in a direction toward the inside of the tubular body. Therefore, in a normal cathode ray tube, the reinforcing band 120 is inserted into the outer peripheral surface of the panel portion 1P and the outer peripheral surface of the panel portion 1P is tightened to recover the vacuum distortion (dent deformation) of the front panel portion 1Pf. At the same time, the impact resistance of the cathode ray tube 1 is enhanced.
[0004]
FIG. 6A is a perspective view showing a schematic configuration of a conventional reinforcing band 120, and FIG. 6B is a sectional view taken along line 6B-6B in FIG. 6A. The reinforcing band 120 is manufactured by folding a band-shaped metal plate 122 in the width direction to have a partially double structure, butting both ends thereof, overlapping a joining plate 126 on the butted portion, and welding the metal plate 122. . By fitting such a ring-shaped reinforcing band 120 to the outer peripheral surface of the panel portion 1P by shrink fitting as shown in FIG. 5, the outer peripheral surface of the panel portion 1P can be tightened by the reinforcing band 120.
[0005]
FIG. 7A is a cross-sectional view of a part of panel portion 1P in which reinforcing band 120 is fitted on the outer peripheral surface. FIG. 7B is an enlarged sectional view of a portion 7B in FIG. 7A. As described above, the panel portion 1P is generally formed by glass molding. Therefore, in order to remove the mold at the time of molding, a mold match line 11 protruding outward in a rib shape is formed at a connection portion between the front panel 1Pf and the skirt portion 1Ps on the outer peripheral surface of the panel portion 1P. The outer dimension of the panel portion 1P in the direction perpendicular to the tube axis is the largest at the portion of the mold match line 11. As shown in FIG. 7A, as the distance from the mold match line 11 to the front panel portion 1Pf side and the skirt portion 1Ps side increases, the outer dimension of the panel portion 1P in the direction orthogonal to the tube axis becomes larger. It gradually gets smaller. That is, the cross-sectional shape of the outer peripheral surface of the panel portion 1P is a substantially “<” shape having the mold match line 11 as the apex.
[0006]
Therefore, by inserting the reinforcing band 120 on the mold match line 11 having the maximum outer dimension and concentrating the tightening force of the reinforcing band 120 on the mold match line 11 and applying the maximum tightening force, the above-described panel is obtained. The vacuum distortion of the portion 1P can be effectively corrected.
[0007]
However, as shown in FIG. 7 (A), since the tightening force of the reinforcing band 120 is constantly concentrated on the mold match line 11, which is the maximum outer dimension of the panel portion 1P, cracks, scratches, and the like are formed on the mold match line 11. Likely to happen.
[0008]
Patent Literature 1 discloses a portion of a reinforcing band 120 facing four corners of a panel 1P in order to avoid or reduce contact between a mold match line 11 and a reinforcing band 120 at the four corners of a panel 1P. Discloses a reinforcing band having a recess.
[0009]
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a side facing the panel portion 1P at an end portion of the metal plate 122 in order to prevent a butt portion of the band-shaped metal plate 122 constituting the reinforcing band 120 from damaging the mold match line 11. A reinforcing band having a concave groove formed on the surface thereof is disclosed.
[0010]
[Patent Document 1]
JP-A-11-86756
[Patent Document 2]
JP-A-7-240160
[Problems to be solved by the invention]
However, as shown in FIG. 7B, the reinforcing band 120 and the skirt portion 1Ps do not completely come into surface contact with each other in portions other than the portions where the concave portions of the reinforcing bands of Patent Documents 1 and 2 are formed. Gap 130 is necessarily generated. As a result, there is a problem that the fastening force to the panel portion 1P varies.
[0013]
In the cathode ray tube 1 whose front panel portion 1Pf has a convex curved shape, the allowable range for the variation in the tightening force is relatively large, and the variation hardly affects the impact resistance of the cathode ray tube 1.
[0014]
However, in the cathode ray tube 1 having the front panel portion 1Pf which is almost completely flattened and is becoming the mainstream of recent commercialization, the reinforcing band 120 is provided with the panel portion 1P in order to secure impact resistance. It is indispensable to tighten the outer peripheral surface of the skirt portion 1Ps more strongly than before. In order to realize this, use of a reinforcing band 120 in which the material is changed to a high tensile material has been studied. When such a high-strength reinforcing band 120 is inserted onto the mold match line 11 and the front panel 1P is tightened, the tightening force intensively applied to the mold match line 11 by the reinforcing band 120 increases more than before. . In such a cathode ray tube 1, the variation in the tightening force caused by the gap 130 between the reinforcing band 120 and the skirt portion 1Ps cannot be ignored in order to secure impact resistance.
[0015]
As a standard regarding the impact resistance of a cathode ray tube, there is a ball impact test of IEC (International Electro-technical Commission) and the like. This is a specified test equipment. The specified point on the front panel of the cathode ray tube is impacted with an iron ball (5.5J), and the phenomenon at the time of destruction is compared with the standard. Is to decide. One way to sufficiently satisfy this standard is to increase the wall thickness of the panel portion 1P, but this is not preferable because it causes an increase in the weight of the cathode ray tube and against the trend in the world of energy saving.
[0016]
The present invention has been made to solve the above-mentioned conventional problems, and to provide a cathode ray tube having high impact resistance by reducing the variation in the tightening force of the reinforcing band, performing reliable reinforcement using the reinforcing band, and providing high impact resistance. Aim.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, a cathode ray tube of the present invention is a cathode ray tube including a cathode ray tube, and a reinforcing band attached to tighten an outer peripheral surface of a panel portion of the cathode ray tube, A concave portion is formed on the inner peripheral surface of the reinforcing band facing the outer peripheral surface of the panel portion, at a position corresponding to a mold match line on the outer peripheral surface of the panel portion, over the entire periphery of the reinforcing band. And
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
In the reinforcing band attached to the cathode ray tube of the present invention, a recess is formed over the entire periphery of the reinforcing band at a position corresponding to the mold match line on the outer peripheral surface of the panel portion.
[0019]
This eliminates the gap that has conventionally existed between the reinforcing band and the panel portion, so that the area where the reinforcing band and the panel portion come into surface contact increases. Therefore, since the tightening force inherent in the reinforcing band can be applied to the panel without interposing the mold match line, the variation in the tightening force due to the reinforcing band can be suppressed. Therefore, since the reinforcing band can always exert a stable tightening force, the impact resistance of the cathode ray tube can be improved.
[0020]
In addition, concentration of the tightening force of the reinforcing band on the mold match line is eliminated or reduced. Therefore, the occurrence of cracks, scratches, and the like, which have conventionally occurred on the mold match line, can be prevented.
[0021]
In the cathode ray tube according to the aspect of the invention, it is preferable that a pair of peripheral edges of the recess tighten the outer peripheral surface of the panel portion with the mold match line interposed therebetween. As a result, the tightening force is improved, and the displacement of the reinforcing band can be prevented.
[0022]
In the cathode ray tube according to the aspect of the invention, it is preferable that the reinforcing band is formed in a ring shape in advance, and then inserted into the outer peripheral surface of the panel unit by shrink fitting. This makes it possible to insert the reinforcing band in a simple manner and generate a strong fastening force.
[0023]
Preferably, the recess is a groove formed by slitting or pressing. Thereby, the recess can be easily formed.
[0024]
Hereinafter, an example of a cathode ray tube according to the present invention will be described in detail with reference to the drawings.
[0025]
FIG. 1 is a schematic side view of one embodiment of a cathode ray tube according to the present invention.
[0026]
The cathode ray tube 1 includes a panel section 1P, a funnel section 1F, and a neck section 1N.
[0027]
The panel portion 1P includes a front panel 1Pf having a phosphor screen (not shown) formed by applying a phosphor on an inner surface thereof, and a skirt portion 1Ps extending rearward from the periphery thereof along the tube axis direction. It is formed integrally by molding. The outer surface of the front panel 1Pf may be, for example, either a completely flat surface or a convex curved surface (R-shaped surface). After the panel skirt portion 1Ps and the funnel portion 1F are joined together at the joining portion 7 via the frit glass, they are sealed and evacuated to obtain the hermetic cathode ray tube 1.
[0028]
FIG. 2A is a perspective view showing a schematic configuration of the reinforcing band 2, and FIG. 2B is a sectional view taken along line 2B-2B in FIG. 2A. As in the case of the conventional reinforcing band 120 shown in FIGS. 6 (A) and 6 (B), the reinforcing band 2 is formed by folding back the folded portion 22 on one end side in the width direction of the band-shaped metal plate 20 and partially doubling. It is manufactured by abutting both ends of the structure, overlapping the joining plate 6 on the abutting portion, and welding the metal plate 20. On the inner peripheral surface of the ring-shaped reinforcing band 2, a groove-shaped recess 25 is formed over the entire circumference along the longitudinal direction.
[0029]
FIG. 3A is a cross-sectional view of a part of the panel portion 1P in which the reinforcing band 2 is fitted on the outer peripheral surface. FIG. 3B is an enlarged cross-sectional view of a portion 3B in FIG. The reinforcing band 2 is fitted to the outer peripheral surface of the panel portion 1P by shrink fitting as in the related art, and tightens the outer peripheral surface of the panel portion 1P. The reinforcing band 2 is inserted along the mold match line 11 so as to cover the outer peripheral surface of the panel portion 1P. As shown in FIGS. 3A and 3B, the mold match line 11 fits into the recess 25 of the reinforcing band 2, and as a result, the mold match line 11 makes contact with the reinforcing band 2. Mitigated (preferably avoided). On the other hand, the pair of peripheral edges 26a and 26b on both sides of the recess 25 are in close contact with the outer peripheral surface of the panel portion 1P with the mold match line 11 interposed therebetween, and are tightened. Thereby, the tightening force can be improved, and the displacement of the reinforcing band 2 can be prevented.
[0030]
An example of a method for manufacturing the reinforcing band 2 will be described with reference to FIGS. First, as shown in FIG. 4A, a band-shaped flat metal plate 20 having a thickness of, for example, 1.2 mm is prepared.
[0031]
Next, as shown in FIG. 4B, a continuous groove-shaped recess 25 is formed on one surface of the band-shaped flat metal plate 20 along the longitudinal direction. The recess 25 can be formed by slitting or pressing. The recess 25 is formed at a position corresponding to the mold match line 11 when the reinforcing band 2 is inserted into the outer peripheral surface of the skirt portion 1Ps of the panel portion 1P of the cathode ray tube 1. Further, it is preferable that the width and the depth of the concave portion 25 are large enough to reduce (preferably avoid) the contact of the mold match line 11 with the reinforcing band 2.
[0032]
Next, as shown in FIG. 4 (C), the folded portion 22 on one end side in the width direction of the metal plate 20 is arranged in the longitudinal direction so as to overlap the surface opposite to the surface on which the recess 25 is formed. It is folded back to form a partially double structure. Assuming that the width of the first plate portion 21 in which the recess 25 is formed is W1, and the width of the folded portion (second plate portion) 22 superposed on the first plate portion 21 is W2, W1> W2. The bending position between the first plate portion 21 and the second plate portion 22 is determined in consideration of the position of the recess 25, the mold match line 11, and the like.
[0033]
In this manner, the metal plate 20 having the partially double structure in which the concave portion 25 is formed in the wide first plate portion 21 is formed such that the folded portion 22 is on the outside as shown in FIG. The metal plate 20 is pressed and formed into a shape along the outer peripheral surface of the skirt portion 1Ps of the panel portion 1P of the cathode ray tube 1 by using, for example, a mold, and the two ends of the metal plate 20 are abutted. 6 are overlapped and the metal plate 20 and the joint plate 6 are welded to obtain the ring-shaped reinforcing band 2.
[0034]
At the four corners of the reinforcing band 2, ear-shaped mounting lugs 40 having mounting holes for mounting the cathode ray tube to a fixed portion such as a chassis or a cabinet are attached by welding or the like (see FIG. 1). Then, the ring-shaped reinforcing band 2 thus formed is inserted into the outer peripheral surface of the skirt portion 1Ps of the panel portion 1P of the cathode ray tube 1 by shrink fitting. That is, the reinforcing band 2 is fitted into the mold match line 11 on the outer peripheral surface of the skirt portion 1Ps of the panel portion 1P in a state where the reinforcing band 2 is heated and thermally expanded, and is cooled. Since the reinforcing band 2 contracts as the temperature falls, the reinforcing band 2 firmly tightens the skirt portion 1Ps of the panel portion 1P. At this time, the recess 25 faces the mold match line 11.
[0035]
As described above, in the cathode ray tube according to the present invention, the reinforcing band 2 in which the concave portion 25 is formed at the position corresponding to the mold match line 11 tightens the outer peripheral surface of the skirt portion 1Ps of the panel portion 1P. According to this configuration, the contact between the reinforcing band 2 and the mold match line 11 of the cathode ray tube 1 is avoided or reduced by the recess 25, so that the tightening force is concentrated on the mold match line 11 (particularly at the corner portion). Concentration of the tightening force) can be eliminated or reduced. Therefore, the occurrence of cracks, scratches, and the like, which have conventionally occurred on the mold match line, can be prevented.
[0036]
In addition, since the gap 130 (see FIG. 7B) between the reinforcing band 120 and the skirt portion 1Ps, which is seen in the conventional cathode ray tube, is eliminated, the contact area between the reinforcing band 120 and the skirt portion 1Ps increases. Thus, the tightening force of the reinforcing band 2 can be increased. Therefore, variation in the circumferential direction of the tightening force by the reinforcing band 2 can be significantly reduced, and almost uniform and stable tightening force can be obtained over the entire circumference of the panel portion 1P. As a result, a cathode ray tube having excellent impact resistance can be realized regardless of whether the outer surface of the front panel 1Pf of the cathode ray tube is flat or convex.
[0037]
The ring-shaped reinforcing band 2 shown in the above-described embodiment is obtained by butting both ends of a band-shaped metal plate and overlapping and welding a joint plate to the butted portion. It is not limited to this. For example, in a state in which both ends of the metal plate are slightly separated from each other, a joining plate may be overlapped so as to extend over the metal plate, and these may be joined by welding. Alternatively, both ends of the metal plate may be overlapped and joined by welding.
[0038]
Further, in the above-described embodiment, the reinforcing band 2 previously formed in a ring shape is inserted into the panel portion 1P, but the present invention is not limited to this. For example, a configuration in which a band-shaped metal plate having the recess 25 formed thereon is wound around the outer peripheral surface of the panel portion 1P and fastened may be employed.
[0039]
【The invention's effect】
As described above, according to the present invention, there is no longer a gap between the reinforcing band and the panel portion, so that the area where the reinforcing band and the panel portion come into surface contact increases. Therefore, variation in the tightening force due to the reinforcing band can be reduced. Therefore, since the reinforcing band can always exert a stable tightening force, the impact resistance of the cathode ray tube can be improved.
[0040]
In addition, concentration of the tightening force of the reinforcing band on the mold match line is eliminated or reduced. Therefore, the occurrence of cracks, scratches, and the like, which have conventionally occurred on the mold match line, can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic side view of one embodiment of a cathode ray tube according to the present invention; FIG. 2 (A): a perspective view showing a schematic configuration of a reinforcing band inserted into the cathode ray tube of the present invention; (B): sectional view of the reinforcing band taken along line 2B-2B in FIG. 2 (A). FIG. 3 (A): panel in which the reinforcing band is fitted on the outer peripheral surface in the cathode ray tube according to the present invention. 3 (B): an enlarged sectional view of a portion 3B in FIG. 3 (A). FIG. 4 is a perspective view showing a method of manufacturing a reinforcing band to be inserted into a cathode ray tube according to the present invention in the order of steps. FIG. 5 is a schematic side view of a conventional cathode ray tube. FIG. 6A is a perspective view showing a schematic configuration of a reinforcing band inserted into the conventional cathode ray tube. FIG. FIG. 7A is a sectional view of the reinforcing band taken along line 6B-6B in FIG. 7A. FIG. Some of the reinforcing band outer peripheral surface fitted panels sectional view showing 7 (B): an enlarged sectional view of a portion 7B in FIG. 7 (A) DESCRIPTION OF REFERENCE NUMERALS
DESCRIPTION OF SYMBOLS 1 Cathode ray tube 1P Panel part 1Pf Front panel 1Ps Skirt part 1F Funnel part 1N Neck part 11 Mold match line 2 Reinforcement band 6 Joint plate 7 Joining part 20 Metal plate 21 First plate part 22 Second plate part (return part)
25 recess

Claims (4)

A cathode ray tube comprising a cathode ray tube and a reinforcing band attached to tighten an outer peripheral surface of a panel portion of the cathode ray tube,
On the inner peripheral surface of the reinforcing band facing the outer peripheral surface of the panel portion, at a position corresponding to a mold match line on the outer peripheral surface of the panel portion, a recess is formed over the entire periphery of the reinforcing band. Characteristic cathode ray tube. 2. The cathode ray tube according to claim 1, wherein a pair of peripheral edges of the recess tighten the outer peripheral surface of the panel portion with the mold match line interposed therebetween. 3. 2. The cathode ray tube according to claim 1, wherein the reinforcing band is formed in a ring shape in advance, and then inserted into the outer peripheral surface of the panel portion by shrink fitting. 3. The cathode ray tube according to claim 1, wherein the recess is a groove formed by slitting or pressing.

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