KR100814866B1 - Deflection apparatus for cathode ray tube - Google Patents

Abstract

A deflection device mounted on the outer periphery of the funnel of the cathode ray tube to form a magnetic field for deflecting the electron beam, to prevent misconvergence of the electron beam that occurs when it is mounted in a state in which the center axis of the cathode ray tube is not aligned with the tube axis. A horizontal deflection coil, a vertical deflection coil positioned outside the horizontal deflection coil, an insulator interposed between the horizontal deflection coil and the vertical deflection coil, and a core provided on the insulator in association with the vertical deflection coil; The core is formed in a shape in which a large opening and an introduction port are opposed to each other, and an adjusting piece for adjusting the trajectory of the electron beam is provided at a core portion of at least one of the openings.

Cathode ray tube, deflection coil, core, adjusting piece, deflection device, magnetic line

Description

Deflection Device for Cathode Ray Tubes {DEFLECTION APPARATUS FOR CATHODE RAY TUBE}

1 is a half side cross-sectional view showing a cathode ray tube according to an embodiment of the present invention,

2 is a perspective view showing a core of a deflection device according to an embodiment of the present invention,

3 is a bottom view showing a core of a deflection device according to another embodiment of the present invention,

4 is a schematic diagram illustrating a scanning trajectory formed by an R and B electron beam by a deflection apparatus according to the prior art,

5 is a schematic diagram illustrating a scanning trajectory formed by an R and B electron beam by a deflection apparatus according to an embodiment of the present invention.

6 is a side view showing a deflection apparatus for a cathode ray tube according to the prior art.

The present invention relates to an apparatus used for deflection of an electron beam in a cathode ray tube used as a television receiver or a computer monitor.

As is well known, a cathode ray tube is an electron tube that embodies an image by deflecting an electron beam emitted from an electron gun in a horizontal and vertical direction with respect to a screen and allowing the electron beam to land on the phosphor of the screen. The deflection of the electron beam is performed by a deflection apparatus mounted on the outer periphery of the funnel of the cathode ray tube to form horizontal and vertical magnetic fields.

Such cathode ray tubes are mainly used as color TVs or computer monitors, and in recent years, large and high-definition digital high-definition televisions (HDTVs) have been spotlighted according to consumer preferences. I am getting it.

In order for the cathode ray tube to realize a high quality image, it is important that the electron beam emitted from the electron beam is deflected well to the periphery of the screen to reach the corresponding phosphor. In general, the deflection apparatus forms a horizontal and vertical deflection magnetic field. Each of the deflection coils, an insulator arranged with the horizontal and vertical deflection coils interposed therebetween, and a core provided in association with the vertical deflection coils on the insulator are constituted. Moreover, the overall shape of the deflection device generally has a trumpet or funnel shape corresponding to the shape of the funnel portion of the cathode ray tube to which the deflection device is mounted. When arranged on the opposite circumference of the funnel, the large openings of the respective configurations face the panel side direction of the cathode ray tube, and the introduction openings face the neck side direction of the cathode ray tube.

On the other hand, when the deflection apparatus is mounted on the funnel of the cathode ray tube, it must be mounted while keeping its center coincident with the center of the tube axis of the cathode ray tube, so that the magnetic field generated in the horizontal deflection coil and the vertical deflection coil is evenly distributed to the electron beam scanned by the electron gun. Can be crazy. In particular, in a cathode ray tube having an in-line electron gun in which the cathodes corresponding to R, G, and B are arranged side by side in a horizontal direction, the mounting state of the deflection device is important. Considering that the vertical deflection magnetic field distribution is uniformly formed left and right centered on the tube axis of the cathode ray tube, when the left and right balance of the magnetic field distribution is not balanced, the peripheral portion of the R, G, and B electron beams This is because an abnormality is generated in the scan trajectory of the corresponding R and B electron beams, which causes misconvergence, which causes color shift in the cathode ray tube, thereby degrading the quality.

Thus, as shown in FIG. 6, the insulator 2 portion corresponding to the horizontal deflection coil 4 and the vertical deflection coil 6 in the insulator 2 portion located in the introduction port side is conventionally shown in FIG. 6. The above-mentioned problem is going to be solved by arrange | positioning the magnetic piece 8 on the top.

That is, the magnetic piece 8 affects the horizontal deflection coil 4 among the horizontal and vertical deflection coils 4 and 6 installed on the insulator 2 at the above-described position, so that the horizontal deflection coil 4 By changing the magnetic field generated by (4), it is possible to prevent the misconvergence of the electron beam, which occurs when the deflecting device is not mounted in position as described above. Here, the horizontal and vertical deflection coils 4 and 6 are provided in pairs, respectively, inside and outside of the insulator 2 so as to be uniformly deflected up, down, left, and right symmetrically about the tube axis of the cathode ray tube. It will form a magnetic field.

By the way, in the conventional operation of the magnetic piece 8, the magnetic piece 8 affects not only the horizontal deflection coil 4 but also the vertical deflection coil 6, causing undesirable results.

For example, when one of the pair of vertical deflection coils 6 is affected by the magnetic piece 8, the inductance of the affected side coil is increased, so that the current waveform flows into both vertical deflection coils. Differences occur in this way, which causes the vertical line trajectory of the electron beam to be unbalanced based on the left and right sides of the screen.

Furthermore, in the above case, the vertical deflection magnetic field is reduced by a predetermined reference value, and thus the electron beam emitted from the electron gun is not scanned by the desired phosphor due to the reduced vertical deflection magnetic field, but is scanned with a phosphor of a different color, thereby hitting it. It causes misconvergence which is color mismatch.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a magnetic piece in a deflection device to compensate for a non-uniform deflection magnetic field caused by misalignment of the deflection device. The present invention provides a deflection device for a cathode ray tube that can prevent misconvergence of an electron beam that occurs due to failure.

In order to realize the above object,

A horizontal deflection coil, a vertical deflection coil positioned outside the horizontal deflection coil, an insulator interposed between the horizontal deflection coil and the vertical deflection coil, and a core provided on the insulator in association with the vertical deflection coil; The core is formed in a shape in which the large opening and the introduction port is opposed to each other, and the deflection device for the cathode ray tube provided with an adjusting piece for adjusting the trajectory of the electron beam in the core portion of at least one of the openings and the introduction opening. do.

In addition, the present invention to realize the above object,

A panel having a fluorescent screen formed on an inner surface thereof, a funnel mounted to the panel and mounted on an outer periphery, and a deflection device for deflection of three rows of electron beams; and a cathode connected to the funnel and disposed in-line on the inside thereof. And a neck on which an electron gun for emitting electron beams is emitted, wherein the deflection device includes a horizontal deflection coil, a vertical deflection coil located outside the horizontal deflection coil, and an insulator interposed between the horizontal deflection coil and the vertical deflection coil. And a core provided on the insulator in association with the vertical deflection coil, wherein the core has a shape in which a large opening and an opening are opposed to each other, and the core portion of at least one of the openings and the opening is formed at a core portion thereof. Provided is a cathode ray tube provided with an adjusting piece for adjusting the trajectory of an electron beam.

In the above, the adjusting piece is made of a magnetic material provided at any interval on the core side end circumference of the opening side, wherein the adjusting piece is inserted into the recess formed in the core side end circumference, the shape Concave to form a surface facing the center of the deflection device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a half side cross-sectional view showing a cathode ray tube according to an embodiment of the present invention. When the cathode ray tube is schematically described with reference to the drawings, first, the cathode ray tube is formed to have a substantially rectangular shape and a funnel connected to the panel 22 while having an approximately funnel shape. 24 and a neck 26 formed in a substantially cylindrical tube connected to the funnel 24. Here, the panel 22, the funnel 24 and the neck 24 are assembled into a single tube to maintain the inside of the vacuum.

In the cathode ray tube, a fluorescent screen 28 in which R, G, and B phosphors are arranged in a predetermined pattern is formed on an inner surface of the panel 24, and on the outer circumference of the funnel 24, the fluorescent screen 28 is formed. And a deflecting device 30 for deflecting the electron beam to be scanned. In addition, an electron gun 32 for generating the electron beam is mounted inside the neck 26. In the present embodiment, the electron gun 32 has three cathodes 32a corresponding to R, G, and B. ) Are arranged in-line and can emit three rows of electron beams from these cathodes 32a.

The electron beam generated by the electron gun 32 is scanned toward the center or periphery of the fluorescent screen 28 to strike a desired phosphor of the fluorescent screen 28 to emit a predetermined light, thereby providing a predetermined image. When the electron beam is scanned into the periphery of the fluorescent screen 28, as is well known, the electron beam is deflected to a desired position under the influence of the magnetic field generated by the deflecting device 30.

That is, the deflection device 30 forms a horizontal and vertical deflection magnetic field when the cathode ray tube acts, and when the electron beam passes through the funnel 24, the electron beam is affected by the magnetic field. It is configured to be deflected to the periphery of the screen 28, in particular in the present invention, the deflection device 30 in the manufacturing process of the cathode ray tube, can not be fitted to match the central axis of the tube axis (Z) of the cathode ray tube Even in this case, the above-described electron beam is configured as follows so that it can be deflected well without generating miss convergence.

First, the deflection apparatus 30 includes a horizontal deflection coil 30a and a vertical deflection coil 30b for forming horizontal and vertical deflection magnetic fields, and the horizontal deflection coil 30a and a vertical deflection coil 30b. An insulator 30c interposed therebetween to electrically insulate them is provided. Here, the insulator 30c is formed in an approximately trumpet shape, and the horizontal deflection coil 30a is inside the insulator 30c, and the vertical deflection coil 30b is formed on the insulator 30c. 30c) outward.

At this time, the horizontal deflection coil 30a and the vertical deflection coil 30b respectively correspond to the shape of the insulator 30c, that is, the shape of the portion of the funnel 24 on which the deflection device 30 is mounted. It is provided with, and consists of a pair of coil members substantially taking the overall shape as a half trumpet body.

In addition, the configuration of the deflecting device 30 includes a core 30d which is disposed outside of the insulator 30c in association with the vertical deflection coil 30b. In the present embodiment, the core 30d is included. And the vertical deflection coils 30b have a mutual relationship such that the deflection device 30 is made of a so-called saddle-saddle type deflection device.

As shown in FIG. 2, the core 30d generally has a fallopian tube shape in which the opening 300d and the introduction port 302d are opposed to each other while corresponding to the shape of the insulator 30c. An adjustment piece 30e for adjusting the scanning trajectory of the electron beam is provided at a side end of at least one of the openings 300d and the introduction port 302d of the core 30d.

The adjusting piece 30e is provided with a magnetic material having a high permeability to serve to locally adjust the magnetic field formed by the horizontal deflection coil 30a at the above-described position. In this embodiment, the adjusting piece 30e ), As shown in FIG. 2, the recessed part 306d is formed in arbitrary intervals in the core side end 304d of the introduction port 302d side of the said core 30, and is inserted in this. Of course, on the said core 30d, the arrangement | positioning part of the said adjusting piece 30e is not limited to the above-mentioned case, As shown in FIG. 3, the core 30d side of the core 30d of the core 30d The side end 308d may also be disposed, and in some cases, the opening 300d and the introduction port 302d may be formed at both sides.

In addition, the adjustment piece (30e) is formed to be concave to form a surface toward the center of the deflection device for its good action, the degree of concavity is the adjustment piece 30 to the horizontal deflection coil (30a) It may vary depending on the degree of impact.

Thus, the cathode ray tube configured as described above may be deflected by the action of the adjusting piece 30e even if the deflecting device 30 is not mounted at the correct position on the funnel 34 in the manufacturing process. It is possible to prevent misconvergence of the electron beam due to incorrect mounting of the electron beam.

That is, as shown in FIG. 4, when the deflecting device 30 is mounted inconsistently with the tube axis Z of the cathode ray tube, the deflecting device 30 corresponds to a surrounding electron beam among the electron beams emitted from the electron gun 32. When the R and B electron beams are landed at the periphery of the fluorescent screen 28, the fluorescent screen 28 is unevenly affected by the magnetic field formed by the horizontal deflection coil 30a of the deflection device 30. The trajectory scanned to the left side (referenced) of the screen and the trajectory scanned to the right side of the fluorescent screen 28 are different.

In other words, the R electron beam and the B electron beam are respectively formed at the right periphery of the fluorescent screen 28 as compared to the vertical line spacing of the trajectories formed by the R electron beam and the B electron beam at the left periphery of the fluorescent screen 28, respectively. Miss convergence is caused to increase the vertical line spacing of the trajectory.

In the mounting state of such a deflection apparatus 30, as shown in FIG. 5, when the said adjustment piece 30e is arrange | positioned at the side end part of the said core 30d, this adjustment piece 30 is a said horizontal deflection coil. Of the magnetic fields formed by (30a), the magnetic field distributed to a portion close to itself is locally changed. That is, referring to FIG. 5, in the magnetic field formed by the pair of horizontal deflection coils 30a, the deflection magnetic field formed by the left portion (based on the drawing) on which the adjusting piece 30e is disposed is the adjusting piece. The magnetic force lines distributed in the proximal portion of the adjusting piece 30e are formed by the 30e so as to have an ellipsoidal shape with a curvature larger than that of the other portions.

Therefore, according to the distribution state of the horizontal deflection magnetic field, of the R, B electron beam, the B electron beam receives less overall horizontal deflection magnetic field due to the magnetic field concentrated on the adjusting piece 30e, the R electron beam is the B Since the horizontal deflection magnetic field is more affected than the electron beam to improve deflection sensitivity, the R and B electron beams are landed to the left and right periphery of the fluorescent screen 28, so that the vertical line of the trajectory is It is possible to achieve a uniform gap.

On the other hand, since the adjusting piece 30e is inserted into the recess 306d of the core 30d to affect the horizontal deflection magnetic field, the adjusting piece 30e locally changes the horizontal deflection magnetic field, and thus the horizontal deflection magnetic field. It does not affect the overall number of magnetic lines of force, and furthermore, it does not affect the vertical deflection magnetic field formed by the deflection device so that the electron beam can be deflected well even when the deflection device 30 is incorrectly mounted. do.

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 is within the scope of the present invention.

As described above, the present invention effectively adjusts the horizontal deflection magnetic field distribution to the adjusting piece provided on one side of the core of the deflecting device, so that the deflection device cannot be correctly mounted on the funnel of the cathode ray tube. It has the effect of realizing high quality images in the entire fluorescent screen by preventing vergence in advance.

Claims (8)

A horizontal deflection coil; A vertical deflection coil located outside the horizontal deflection coil; An insulator interposed between the horizontal deflection coil and the vertical deflection coil; And A core provided on the insulator in association with the vertical deflection coil Including, The core is A deflection device for cathode ray tubes comprising a shape in which a large opening and an introduction port are opposed to each other, and an adjusting piece for adjusting the trajectory of the electron beam is provided at a core portion of at least one of the openings and the introduction port. The method of claim 1, The deflection device for cathode ray tubes, wherein the adjusting piece is a magnetic substance provided at random intervals on the core side end circumference of the opening side. The method of claim 2, A deflection device for cathode ray tubes, wherein the adjusting piece is inserted into a recess formed in the core side end portion. The method of claim 3, wherein The deflection apparatus for cathode ray tubes in which the surface of the said adjustment piece toward the center part of the said deflection apparatus is formed concave. A panel having a fluorescent screen formed on an inner surface thereof; A funnel connected to the panel and equipped with a deflecting device for deflecting three rows of electron beams on an outer circumference thereof; And A neck connected to the funnel and provided therein with an electron gun which emits the electron beams from a cathode arranged inline Including, The deflection device, A horizontal deflection coil; A vertical deflection coil located outside the horizontal deflection coil; An insulator interposed between the horizontal deflection coil and the vertical deflection coil; And A core provided on the insulator in association with the vertical deflection coil Including, The core is A cathode ray tube made of a shape in which a large opening and an introduction port are disposed to face each other, and an adjusting piece for adjusting the trajectory of the electron beam is provided at a core portion of at least one of the openings and the introduction opening. The method of claim 5, wherein The cathode ray tube according to claim 1, wherein the adjusting piece is a magnetic substance provided at random intervals on the core side end circumference of the opening side. The method of claim 6, The cathode ray tube which the said adjustment piece is inserted in the recessed part formed in the said core side edge part. The method of claim 7, wherein Cathode ray tube formed by concave the surface of the adjusting piece toward the center of the deflecting device.

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