JPH08280036A - Cathode-ray tube and fastening band - Google Patents

Abstract

PURPOSE: To simplify structure, to reduce man-hour for working, to improve the yield of material securing and to enable inexpensive configuration by arranging a degausing coil supporting part on the fastening band. CONSTITUTION: When forming a fastening band 6, fitting parts 5 for fitting a CRT 1 onto a cabinet or a chassis are integrally formed at four corners of the almost rectangularly formed fastening band 6. Further, supporting parts 14 inserting and fixing supporters 15 for supporting a degausing coil 7 are formed integrally with the fastening band 6 on the upside and downside of the CRT 1 corresponding to the long side of a face plate part 2. Holes for screwing are pierced on these fitting parts 5, and rectangular holes for inserting and fixing the supporters 15 are pierced on the supporting parts 14. Besides, rectangular insertable pawls pierced on the supporting parts 14 are arranged under the opposite side where the clip part of a main body is formed, and after these pawls are inserted to the rectangular holes, the pawls are pushed out and strongly fixed on the supporting parts 14. Then, the supporters 15 are inserted to the supporting parts 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube and a tightening band, and more particularly to a cathode ray tube and a tightening band having an improved degaussing coil support structure.

[0002]

2. Description of the Related Art Conventionally, an internal magnetic shield member is provided to shield an aperture grill and a shadow mask, which are conventionally provided in a cathode ray tube, from an external magnetic field such as geomagnetism, and a degaussing coil is provided near a funnel portion of the cathode ray tube. Color misalignment due to mislanding where the electron beam deviates from the predetermined trajectory.
Prevents color unevenness.

In the conventional cathode ray tube, the above-described degaussing coil is mounted on the upper and lower ends of an external magnetic shielding member arranged so as to cover the cathode ray tube body or supported by a cabinet or the like.

However, in order to cancel the magnetic force magnetized from the external magnetic shield member to the aperture grill or the like inside the tubular body, the distance between the degaussing coil and the canceling member becomes large, and the effect is weakened and the degaussing at the time of assembly is eliminated. There is a problem that the coil becomes an obstacle, and the degaussing coil has come to be directly supported on the cathode ray tube.

For example, JP-A-55-96541,
In Japanese Utility Model Publication No. 55-9002, there is a panoply type (PO
A demagnetization coil is attached to a rim band or the like of a P-type) implosion prevention cathode ray tube.

FIGS. 10A and 10B show such a cathode ray tube, in which a plurality of rectangular grooves 4 are provided on a rim band 3 wound around a side wall portion 2 of a face plate panel 1 of the cathode ray tube, and on the rim band 3. A tension band (hereinafter referred to as a tightening band) 6 having mounting portions 5 at four corners is wound around the
As shown in FIG. 10B, a rectangular degaussing coil 7 inserted in the funnel portion is provided on a rectangular groove 4 formed in the width direction of the rim band 3, and the lower side of the tightening band 6 is along the rectangular groove 4. It is disclosed that the support band 8 is inserted through the support band 8 and passed through the upper side of the tightening band 6.

Further, in the T-band type implosion prevention cathode wire 1, the degaussing coil 7 is attached to the tightening band 6 constituting the T-band.
A configuration in which a clip for supporting the is locked is also disclosed in, for example, Japanese Utility Model Laid-Open No. 55-5411.

The configuration disclosed in the above publication is shown in FIG. 11A.
As shown in B and B, a ring-shaped protruding portion 10 is formed so as to surround the side wall portion of the face plate panel portion 2 of the cathode ray tube 1 constituted by the face plate panel portion 2 and the funnel portion 9. The mounting portions 5a having an L-shaped cross section are arranged at the four corners on the projecting portion 10, and the tightening bands 6 forming the T band are wound around the mounting portions 5a.
As shown in B, a clip 11 capable of supporting the degaussing coil 7 with a support band 8 is locked in a gap formed between the tightening band 6 and the ring-shaped protruding portion 10.

[0009]

FIG. 1 of the above-mentioned conventional configuration.
According to the configurations shown in FIGS. 0A and 0B, in addition to the trouble of forming the rectangular groove 4 in the rim band 3, after the tightening band 6 is tightened on the rim band, the support band 8 is inserted into the rectangular groove 4 and the degaussing coil 7 is inserted. However, there is a problem that it takes a lot of time to support and requires a lot of time for assembly.

Further, the structure shown in FIGS. 11A and 11B requires a face plate provided with a ring-shaped protrusion so as to surround the side wall 2 of the face plate panel 1 which constitutes the cathode ray tube. There is a problem in that it is not immediately applicable to a face plate panel of a general cathode ray tube tube and leads to cost increase.

The present invention provides a cathode ray tube and a tightening band in which the above problems are solved. The object of the present invention is to have an extremely simple structure, a small number of processing steps, and a high material yield, which is inexpensive. To obtain a configurable cathode ray tube and clamp band.

[0012]

The cathode ray tube of the present invention is a cathode ray tube in which a fastening bunt is wound around the side wall portion of the face portion of the tube body, and degaussing coils are mounted above and below the tube body. The degaussing coil supporting portion is arranged on the tightening band.

The tightening band of the present invention is provided with a disposing portion in which the degaussing coil supporting portion can be disposed.

[0014]

In the cathode ray tube and the tightening band according to the present invention, the supporting member for holding the degaussing coil can be attached to the tightening band at the disposing portion of the tightening band with one touch, and it is simple and has a high yield of plate cutting. The one with less man-hours can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a cathode ray tube (hereinafter referred to as CRT) of the present invention, an embodiment of a color cathode ray tube and a tightening band using an aperture grill with one gun and three beams will be described with reference to FIGS.

FIG. 1 is a perspective view showing an assembled state of a CRT and a tightening band according to the present invention, and FIG. 2 is a side sectional view showing an attached state of a support for supporting a degaussing coil attached to the tightening band.
FIG. 3 is a perspective view of a support tool that supports the degaussing coil, and FIG. 4 is C
FIG. 5 is a perspective view showing a state where the fastening band of the present invention is fitted to the RT, FIG. 5 is a perspective view of the fastening band of the present example, and FIG. 6 is an explanatory view of plate cutting of the present example and the conventional fastening band. is there. 1 to 6, the parts corresponding to those of the CRT described in the conventional configuration are designated by the same reference numerals.

1 and 2, a CRT 1 is a cathode ray tube in which a funnel portion 12 including a neck portion 13 is integrated with a side wall portion of a face plate panel portion 2 via a solder glass layer 16 such as frit glass. It is formed as a tube body, has an electron gun of 1 gun 3 beams and a stem portion 17 which are not shown in the neck portion 12, and has a stripe fluorescent surface (card grill) on the inner surface of the face plate panel 2. Aperture grill 1 facing the card grill as shown in
8, the lattice of the aperture grill and the like are stretched on the frame and are locked to the protrusions 19 provided on the inner surface of the side wall portion of the face plate panel portion 2.

In this example, the tightening band 6 is wound by shrink fitting or the like between the side wall portion of the face plate panel portion 2 of the CRT as described above, that is, between the face portion and the solder glass layer 16.

FIG. 4 shows a state in which the tightening band 6 is wound so as to surround the side wall portion of the face plate panel portion 2 of the CRT.

The fastening band 4 has four corners formed in a substantially rectangular shape, and mounting portions 5 for mounting the CRT 1 on a cabinet or chassis are integrally formed at the time of molding the fastening band 6.

Further, in this example, as shown in FIG. 5, the support portion 14 into which the support tool 15 for supporting the degaussing coil 7 is fitted and fixed on the upper and lower sides corresponding to the long sides of the face plate portion 2 of the CRT 1.
Is integrally formed with the tightening band 6.

A through hole 5a for screwing is provided in the mounting portion 5 described above.
And a rectangular hole 14a for inserting and fixing the support tool 15 is formed in the support portion 14.

An example of the support 15 for holding the degaussing coil 7 fitted and fixed to the support 14 will be described with reference to FIG. A support tool for supporting the degaussing coil 7 is formed of synthetic resin or the like, and a clip portion 15 having an inner diameter smaller than the diameter of the degaussing coil 7 is provided at one upper end of a substantially rectangular main body 15a.
b is formed in a semi-cylindrical shape. Further, the support portion 14 is provided below the opposite side of the main body where the clip portion 15b is formed.
A claw 20 that can be inserted into the rectangular hole 14 that is bored is provided, and after the claw 20 is inserted into the rectangular hole 14a, the claw 20 is expanded and firmly fixed to the support portion 14.

As shown in FIG. 1, such a supporting tool 15 is fitted into the supporting portion 14 and the demagnetizing coil 7 formed in the frame shape of the spectacles is clipped by the clip portion 14b of the supporting tool 15. The degaussing coil 7 arranged on the upper side of the CRT 1 in FIG. 1 has a spectacle frame shape in order to avoid the vicinity of the anode button 21, and the degaussing coil 7 supported on the lower side of the CRT 1 has a substantially rectangular shape. There is.

6A and 6B illustrate the conventional stripping of the tightening band 6 described with reference to FIG. 5 in the past and this example during pressing.

The annular tightening band 6 described with reference to FIG. 5 is formed so that the tightening band 6 is formed by welding two strip-shaped members.

FIG. 6B shows a conventional planing 1.2.
The cold-rolled steel sheet 22 of t to 2.0 t is coiled with the coil width W and is progressively fed in the direction of arrow D at the pitch P by the die of the progressive press to be punched. That is, the annular tightening band 6
Forms a rectangular tightening band 6 by bending two strip-shaped members 6A and 6B in a U-shape. In this case, the mounting portions 5a of the strip-shaped members 6A and 6B face each other and are plate-cut. However, in the present example, as shown in FIG. 6A, the supporting portions 14 and 14 are faced to each other with a space of, for example, about 180 mm between the mounting portions 5 to form a plate, so that the conventional method is discarded. The existing steel material portion 22A can be formed as the support portion 14, and the material can be effectively used.

Of course, in the above-mentioned pressing, the rectangular holes 14a and the through holes 5a formed in the supporting portion 14 and the mounting portion 5 are pressed at the same time as the die cutting of the belt-shaped members 6A and 6B. Reference numeral 23 is a joint portion when the two belt-shaped members 6A and 6B are bent in a U shape.

In the above-mentioned tightening band 6, the mounting portion 5 and the supporting portion 14 of the degaussing coil 7 are integrally formed.
As shown in FIG. 7, a support portion 14 for supporting the degaussing coil 7 is punched as a separate body on a belt-shaped member 6C integrally formed with only one body, and then the belt-shaped member 6C is fixed by welding 24 or the like to form the tightening band 6. You may do so.

The annular tightening band 6 shown in FIGS. 5 and 7.
When the CRT is shrink-fitted by high-frequency heating or the like to apply a predetermined compressive force after it is fitted so as to surround the side wall portion of the face plate panel section 2, the strip shape is considered. If the widths of the members 6A and 6B are uniform, the tightening band 6 is uniformly warmed because an induced current flows uniformly as shown in FIGS. 8A and 8B. As shown by the broken line, it expands in a convex shape.

However, when a support portion 14 for holding the degaussing coil 7 is added as shown in FIGS. 5 and 7, the strip-shaped member 6A is added.
The widths of 6B and 6B become wider in this portion, and it becomes difficult for the induced current to flow in this portion, and the tightening band 6 does not expand in a similar manner due to a temperature difference, and as shown in FIGS. The extension of the tightening band 6 between the upper mounting portions 5 and 5 of the long side and between the lower mounting portions 5 and 5 is concave as shown by the broken line, and is convex between the upper and lower mounting portions 5 and 5. Then, there was a problem that the shrink-fitting property at the time of insertion was deteriorated.

Therefore, the widths W ₁ and W _{2 of the} support portion 14 are
The result of an experiment on the shrinkage-fitting yield of the produced tightening band 6 by changing the ratio of the tightening band 6 to the entire circumference is shown below.

[0033]

[Table 1]

Here, the ratio of the supporting portion to the entire circumference indicates a value of 4W ₁ or 4W _{2 which} is four times the width W ₁ or W ₂ of the supporting portion at the four corners.

As is clear from the above experiment, FIGS.
As shown in Fig. 9, if the ratio of the length of 4W ₁ of the support portion 14 is 15% or less of the entire circumference of the tightening band 6, there is no problem in shrink-fitting property, and as shown in Figs. _It will be understood that the size of the supporting portion 14 may be selected so that the ratio of the length of the supporting portion 14 does not exceed 20% as shown in 2.

In the cathode ray tube and the tightening band of the present invention, the supporting portion for mounting the degaussing coil is arranged in the tightening band, so that the plate yield of the material is improved and the number of working steps can be reduced.
Good reproducibility of mounting on the cabinet and reproducibility of the mounting position of the degaussing coil supporter can be obtained. Further, when the support portion is welded to the belt-shaped member, it is possible to obtain the one having a good mountability to the pipe body. Moreover, a normal tubular body can be used.

In this example, the CRT using the 1-gun 3-beam aperture grille has been described, but the shadow mask type CRT is used.
Obviously, it is also applicable to RT.

[0038]

According to the CRT and the tightening band of the present invention, it is possible to obtain an inexpensive product having a very simple structure, a small number of machining steps, and a good yield of plate cutting.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a cathode ray tube of the present invention.

FIG. 2 is a sectional view of a degaussing coil used in the cathode ray tube and the tightening band of the present invention on the mounting side.

FIG. 3 is a perspective view of a degaussing coil support member used in the cathode ray tube and the tightening band of the present invention.

FIG. 4 is a perspective view showing a fastening band attached state to the cathode ray tube of the present invention.

FIG. 5 is a perspective view showing an embodiment of the tightening band of the present invention.

FIG. 6 is an explanatory view of a tightening band plate used in the present invention.

FIG. 7 is a perspective view showing another embodiment of the tightening band of the present invention.

FIG. 8 is a shrink fitting explanatory diagram (I).

FIG. 9 is a shrink fitting explanatory diagram (II).

FIG. 10 is an explanatory view of mounting a conventional degaussing coil.

FIG. 11 is an explanatory view of another conventional degaussing coil attachment.

[Explanation of symbols]

 1 Cathode Ray Tube 2 Face Plate Panel Section 5 Mounting Section 6 Tightening Band 7 Degaussing Coil 14 Support Section 15 Support Tool

Claims (3)

[Claims] 1. A cathode ray tube in which a tightening band is wound around a side wall portion of a face portion of a tube body, and degaussing coils are mounted above and below the tube body, wherein the degaussing coil is supported by the tightening band. A cathode ray tube characterized in that it is provided with a portion. 2. The cathode ray tube according to claim 1, wherein the total length of the degaussing coil supporting portion is 15% or less of the entire circumference of the tightening band. 3. A tightening band comprising an arranging portion capable of arranging a degaussing coil supporting portion.