KR100805156B1 - Cathode ray tube - Google Patents

Abstract

A cathode ray tube is provided to prevent glass debris from being scattered, when the tube is broken, by arranging a wide band at a left side of a panel and a funnel. A cathode ray tube includes a tube(24), a deflector(30), an electron gun(28), and a wide band(32). The tube includes a panel, a funnel, and a neck. A fluorescent screen is formed on an inner surface of the panel. The funnel is connected to the panel through a seal layer. The neck is connected to the funnel. The deflector is implemented outside the funnel. The electron gun is implemented outside the neck. The wide band is arranged at the outside of the panel and the funnel and forms a bead portion, which is arranged to be opposed to the seal layer.

Description

Cathode Ray Tube {CATHODE RAY TUBE}

1 is a side view of an image display device having a cathode ray tube according to a first embodiment of the present invention.

2 is a plan view showing a cathode ray tube according to a first embodiment of the present invention.

3 is a partially enlarged view of FIG. 2.

4 is a partially enlarged cross-sectional view of the cathode ray tube according to the first embodiment of the present invention.

5 is a partially enlarged cross-sectional view of a tube of a cathode ray tube of a comparative example equipped with an explosion-proof band without a bead portion.

6 is a partially enlarged perspective view of a cathode ray tube according to a second exemplary embodiment of the present invention.

FIG. 7 is a partially enlarged plan view of FIG. 6.

8 is a schematic diagram showing a cathode ray tube fixed with the panel and the funnel displaced.

9A and 9B are partially enlarged sectional views showing corner portions of the panel and the funnel in the cathode ray tube shown in FIG. 8.

The present invention relates to a cathode ray tube, and more particularly, to an explosion-proof band that can prevent glass fragments from scattering when a cathode ray tube is broken.

In general, the cathode ray tube is formed of a glass tube, a funnel and a neck in which the neck is integrally bonded to form a vacuum tube. Inside the panel is a fluorescent screen, and inside the neck is an electron gun. The cathode ray tube displays an image by emitting an electron beam from an electron gun and emitting a fluorescent screen.

When the cathode ray tube is subjected to external energy by mechanical or thermal shock, the tube is cracked while the tube is broken, resulting in glass fragments scattering. Therefore, the conventional cathode ray tube is equipped with an explosion-proof band having a predetermined tension outside the skirt portion of the panel to reduce the stress concentrated on the skirt portion, and if the cracks occur in the skirt portion, it is possible to prevent cracks from developing and to prevent glass fragments. It is preventing scattering.

On the other hand, in recent years, slimmer cathode ray tubes have been developed which shorten the overall length of the cathode ray tubes. The slimmer cathode ray tube has a shorter length of funnel than a conventional cathode ray tube, and because of the deformed funnel shape, when external energy is applied, cracks are generated in the funnel and scattered glass fragments from the funnel side to the panel side. The probability of doing so increases.

In view of this, there is a difficulty in effectively suppressing the scattering of glass fragments that may occur in the slimmed cathode ray tube with the aforementioned explosion-proof band mounted only outside the skirt portion.

Therefore, the present invention is to solve the above problems, the present invention is to provide a cathode ray tube that can prevent the scattering of glass fragments when cracks occur in the panel as well as the funnel side by the external energy.

Cathode ray tube according to an embodiment of the present invention, a tube including a panel formed with a fluorescent screen on the inner surface and a funnel connected to the panel by a seal layer and a neck connected to the funnel, and a deflection device installed outside the funnel; It includes an electron gun mounted inside the neck, and an explosion-proof band formed on the outside of the panel and the funnel and forming a bead portion spaced apart from the seal layer in correspondence to the seal layer.

The explosion-proof band may be in close contact with the outer surface of the panel and the funnel at the remaining portions except for the bead portion. The protruding height of the bead portion may be greater than the protruding height of the seal layer, and the width of the bead portion may be formed larger than the width of the seal layer.

The panel and the funnel include four corner portions, and the bead portion may form a plurality of openings at the four corner portions. The openings may be located side by side along the circumferential direction of the explosion-proof band.

The openings may include a first opening in which the center of the shape is located at the corner side bend line of the explosion-proof band, and second and third openings located at both sides of the first opening along the circumferential direction of the explosion-proof band.

The opening may have a long side parallel to the circumferential direction of the explosion-proof band and a short side parallel to the width direction of the explosion-proof band, and may form a corner portion having a curvature. The short side of the opening may have a bead width of 0.5 to 0.8 times.

Explosion-proof bands can be partially multi-structured, which can correspond to panels.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a side view of an image display device having a cathode ray tube according to a first embodiment of the present invention.

Referring to FIG. 1, an image display device includes a cathode ray tube 10 displaying an image, a case 12 enclosing the cathode ray tube 10 to form an appearance of the device, and a case connected to the case 12. 12) a support 14 for supporting it.

The case 12 may be formed at the front and rear of the cathode ray tube 10, respectively, and may include a front case 121 and a back case 122 that are coupled to each other, and the support 14 may be configured to be mounted. Most of the cathode ray tube 10 may be located inside the case 12, and a part of the neck may be located inside the support 14.

2 is a plan view illustrating a cathode ray tube according to a first embodiment of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2.

Referring to FIGS. 2 and 3, the cathode ray tube 10 is formed in a substantially rectangular shape and has a panel 18, which forms a fluorescent screen 16 on an inner surface thereof, and is connected to the panel 18, and has a body portion 201 and a cone portion. A funnel 20 comprising a 202 and a tube 24 consisting of a neck 22 connected to the funnel 20.

The panel 18 includes a skirt portion 181, and a seal layer 26 is positioned between the skirt portion 181 and the body portion 201 to bond the panel 18 and the funnel 20 together. . There is also a seal layer (not shown) that bonds the two between the funnel 20 and the neck 22.

The neck 22 is equipped with an electron gun 28 that emits an electron beam toward the fluorescent screen 16, and a deflection device 30 is installed outside the cone part 202 to generate horizontal and vertical deflection magnetic fields to deflect the electron beam. do.

This cathode ray tube 10 has a long axis of the panel 18 by the deflecting device 30 in which the electron beam emitted from the electron gun 28 is held in a state in which the inside of the tube 24 is maintained in a vacuum, as is well known. Direction (horizontal axis, x-axis direction shown in FIG. 2) and short-axis direction (vertical axis, y-axis direction shown in FIG. 2), and (2) of a color screening device (not shown) provided inside the panel 18. After passing through the electron beam passing hole, (3) a predetermined image is displayed by landing on the fluorescent layer of the fluorescent screen 16.

In the cathode ray tube 10 having the above-described configuration, when cracks are generated in the tube 24 by receiving external energy due to mechanical shock or thermal shock from the outside, the tube 24 is broken due to crack propagation, and glass fragments are broken. In order to prevent scattering, the explosion-proof band 32 of the following structures is provided.

In this embodiment, the explosion-proof band 32 is installed in close contact with the outer surface of the panel 18 and the funnel 20 while covering the seal layer 26 between the panel 18 and the funnel 20. In addition, the explosion-proof band 32 forms the bead part 34 in the position corresponding to the seal layer 26 along the perimeter. The protruding height h1 and the width w1 of the bead portion 34 are formed larger than the protruding height h2 and the width w2 of the seal layer 26, respectively, so that the bead portion 34 and the seal layer 26 are formed. Avoid contact with each other. The cross-sectional shape of the bead part 34 may be formed in a semicircular shape.

The explosion-proof band 32 of the above-described configuration reduces the moment of force acting on the seal layer 26 when the tube 24 is placed under atmospheric pressure and subjected to atmospheric pressure (see the arrow shown in FIG. 3).

4 is a partially enlarged cross-sectional view of the cathode ray tube according to the first embodiment of the present invention.

Referring to FIG. 4, a compressive force (see arrow C) acts on the inside of the panel 18 and the funnel 20 around the seal layer 26, and a tension force T on the outside of the panel 18 and the funnel 20. Arrow). Therefore, the moment Mp toward the panel 18 and the moment Mf toward the funnel 20 are generated outside the seal layer 26.

In the related art, the funnel has a structure that sufficiently withstands the atmospheric pressure so that the Mf moment of the funnel is not large, and the panel-side Mp moment is reduced through the explosion-proof band mounted on the panel. However, in the slimmer cathode ray tube whose overall length is shortened and the deflection angle of the electron beam is enlarged, the outer surface of the funnel body is flattened to form a structure in which the funnel does not sufficiently endure the atmospheric pressure. .

The explosion-proof band 32 of the present embodiment is located not only on the outer surface of the panel 18 but also on the outer surface of the funnel 20, thereby effectively reducing the funnel side Mf moment due to atmospheric pressure. Therefore, the explosion-proof function of the slimmed cathode ray tube can be improved.

In addition, since the aforementioned bead part 34 does not contact the seal layer 26, the tightening force of the explosion-proof band 32 is not transmitted to the seal layer 26, thereby suppressing unnecessary moment generation.

5 is a partially enlarged cross-sectional view of a tube of a cathode ray tube of a comparative example equipped with an explosion-proof band without a bead portion.

Referring to FIG. 5, in the cathode ray tube of the comparative example, the explosion-proof band 32 ′ contacts the seal layer 26 ′ and exerts a force on the seal layer 26 ′. This force is greater than the force reducing the panel side Mp moment and the funnel side Mf moment acting on the seal layer 26 ', and the moment Mp' and the funnel (toward the panel 18 ') inside the seal layer 26'. Moment Mf 'towards 20').

In addition, a tension force (see T arrow) acts on the inside of the panel 18 'and the funnel 20', and a compression force (see arrow C) acts on the outside of the panel 18 'and the funnel 20'. When the force applied by the explosion-proof band 32 'to the seal layer 26' becomes large, a crack occurs inside the seal layer 26 ', and the crack gradually progresses, and the likelihood of breakage of the cathode ray tube increases.

Since the explosion-proof band 32 of the present embodiment does not apply a force to the seal layer 26 through the formation of the bead portion 34, the aforementioned problem can be prevented.

Next, a cathode ray tube according to a second embodiment of the present invention will be described.

6 is a partially enlarged perspective view of a cathode ray tube according to a second exemplary embodiment of the present invention, and FIG. 7 is a partially enlarged plan view of FIG. 6. The same configuration as that of the first embodiment described above will be described using the same reference numerals.

6 and 7, the explosion-proof band 32 of the present embodiment is the same as the explosion-proof band of the above-described first embodiment except that a plurality of openings 36 are formed at four corners of the bead portion 34. It is made of the same configuration.

The bead part 34 positions the plurality of openings 36 side by side in the circumferential direction of the explosion-proof band 32 at every four corners. For example, the bead part 34 includes a first opening 361 and a first opening 361 whose center is located at a corner side bend line (denoted by the AA line in FIGS. 6 and 7) of the explosion-proof band 32. It may include a second opening 362 and the third opening 363 positioned on both sides of the.

The first opening 361 may have a length greater than that of the second opening 362 and the third opening 363, and the second opening 362 and the third opening 363 may have the same length. .

The planar shape of each opening 36 may be a rectangle having a long side parallel to the circumferential direction of the explosion-proof band 32 and a short side parallel to the width direction of the explosion-proof band 32. In addition, the corners of the openings 36 may have a round shape having a curvature, thereby minimizing the stress variation of the explosion-proof band due to the openings 36.

The openings 36 described above reduce the force that the explosion-proof band 32 exerts on the tube 24, more specifically the force exerted on the corners of the panel 18 and the funnel 20, but at four corners. It serves to equalize the force of (32). The explosion-proof band 32 can apply a uniform force to four corner portions of the panel 18 and the funnel 20 in the cathode ray tube attached with the panel 18 and the funnel 20 displaced.

FIG. 8 is a schematic view illustrating a cathode ray tube fixed in a state where the panel and the funnel are displaced, showing only the outer shape of the panel and the funnel. 9A and 9B are partially enlarged cross-sectional views illustrating panels and funnels in the cathode ray tube illustrated in FIG. 8.

Referring to FIG. 8, the panel 18 and the funnel 20 may be fixed in a slightly displaced state, in which case the centerline of the panel 18 and the centerline of the funnel 20 do not coincide. In this cathode ray tube, as shown in FIG. 9A, at one corner side, the end 20 of the funnel toward the panel 18 protrudes toward the outside of the tube 24 rather than the panel, and at the other corner side, as shown in FIG. 9B. As shown, the ends of the funnel 20 facing the panel 18 protrude toward the inside of the tube 24 rather than the panel.

The explosion-proof band 32 applies a stronger force to the funnel 20 at the corner side shown in FIG. 9A than at the corner side shown in FIG. 9B. This consequently means that a difference occurs in the force applied by the explosion-proof band 32 to the tube 24 at the four corners of the panel 18 and the funnel 20.

Here, the explosion-proof band 32 of the present embodiment applies a relatively uniform force to the four corners of the panel 18 and the funnel 20 through the openings 36 described above, the panel 18 as described above In the cathode ray tube fixed in a state where the) and the funnel 20 are displaced, it does not cause a problem due to the difference in the action force of the explosion-proof band 32, and improves the reliability and durability of the cathode ray tube.

In the above-described structure, the short side width w3 of each opening 36 may be 0.5 to 0.8 times the width w1 of the bead portion 34. When the opening 36 short side width w3 is less than 0.5 times the bead portion 34 width w1, it is difficult to realize the above-described effect due to the opening 36, and the opening 36 short side width w3 is beaded. When the width | variety 0.8 of the part 34 width w1 is exceeded, the intensity | strength characteristic of the explosion-proof band 32 can be reduced.

In the above-described first and second embodiments, the explosion-proof band 32 may be formed partially in multiple structures. 3 and 6, the explosion-proof band 32 may have a double structure at a portion corresponding to a part of the panel 18. In addition, an ear 38 (see FIGS. 2 and 3) for fixing the tube 24 to the case 12 (see FIG. 1) may be fixed in a part of the explosion-proof band 32 configured as a single layer. In addition, the explosion-proof band 32 may have a width corresponding to the panel 18 to be larger than a width corresponding to the funnel 20.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, the cathode ray tube according to the present invention has a slim tube according to consumer's preference, and can effectively prevent glass fragments from scattering when the tube breaks due to the action of the explosion-proof band installed outside the panel and the funnel, Unnecessary moments can also be prevented. Therefore, the cathode ray tube according to the present invention can be provided to the consumer as a high quality product having improved explosion-proof characteristics and other reliability.

Claims (11)

A tube including a panel having a fluorescent screen formed on an inner surface thereof, a funnel connected to the panel by a seal layer, and a neck connected to the funnel; A deflection device installed outside the funnel; An electron gun mounted inside the neck; And Explosion-proof band formed on the outside of the panel and the funnel and forming a bead portion spaced from the seal layer corresponding to the seal layer. Cathode ray tube comprising a. The method of claim 1, The explosion-proof band is a cathode ray tube in close contact with the outer surface of the panel and the funnel at the remaining portion except for the bead portion. The method of claim 1, The protruding height of the bead portion is greater than the protruding height of the seal layer, A cathode ray tube, wherein the width of the bead portion is formed larger than the width of the seal layer. The method of claim 1, The panel and the funnel comprise four corner portions, And a bead portion forming a plurality of openings in the four corner portions. The method of claim 4, wherein And a bead portion to position the openings side by side along the circumferential direction of the explosion-proof band. The method of claim 5, The bead portion, A first opening having a center of shape positioned at a corner side bend line of the explosion-proof band; And Second and third openings located at both sides of the first opening along the circumferential direction of the explosion-proof band. Cathode ray tube comprising a. The method of claim 4, wherein The cathode ray tube of which the opening portion has a long side parallel to the circumferential direction of the explosion-proof band and a short side parallel to the width direction of the explosion-proof band. The method of claim 7, wherein Cathode ray tube forming the corner portion having the curvature of the opening. The method of claim 7, wherein A cathode ray tube, wherein a short side of the opening portion is 0.5 to 0.8 times the width of the bead portion. The method according to claim 1 or 4, Cathode ray tube of which the explosion-proof band is partially made of two or more layers. The method of claim 10, Cathode ray tube in which the multiple parts of the explosion-proof band corresponds to the panel.

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