KR100786829B1 - Deflection apparatus for cathode ray tube - Google Patents

Abstract

The present invention relates to a deflection device for cathode ray tubes that deflects an electron beam emitted from an electron gun and corrects screen distortion caused by misalignment of the electron gun.

The deflector is opposed to a separator, which is an insulator, a horizontal deflection coil disposed inside the separator, a vertical deflection coil disposed outside the separator, a core arranged in association with the vertical deflection coil outside the separator, and one side of the separator. A coma coil disposed to correct a screen distortion due to misalignment of the electron gun, and the coma coil includes a magnetic piece including a body having left and right protrusions at both ends thereof, and a plurality of coils wound around the magnetic piece. Each coil is supplied with a different size of current.

Cathode ray tube, deflector, separator, electron gun, electron beam, vertical deflection coil, horizontal deflection coil, magnetic deflection, coma coil

Description

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

1 is a front view of a deflection device according to a first embodiment of the present invention.

FIG. 2 is a right side view of the deflection apparatus shown in FIG. 1. FIG.

3 and 4 are enlarged views of the coma coil shown in FIG. 1, respectively.

5 and 6 are schematic diagrams illustrating the magnetic field flow generated in the coma coil and the force received by the electron beam when the same current is supplied to the first coil and the second coil of FIG. 3, respectively.

7 and 8 are schematic diagrams illustrating magnetic field flow generated in a coma coil and a force applied to an electron beam when different currents are supplied to the first coil and the second coil of FIG. 3, respectively.

9 is a front view of a coma coil according to a second embodiment of the present invention.

10 is an enlarged view of the magnetic piece shown in FIG. 9;

11 is a circuit diagram of a coma coil according to a third embodiment of the present invention.

12 is a circuit diagram of a coma coil according to a fourth embodiment of the present invention.

13 is a front view of a coma coil according to a fifth embodiment of the present invention.

14 is a schematic diagram illustrating a magnetic field flow generated in the coma coil of FIG. 13.

Fig. 15 is a partial cutaway sectional view of a cathode ray tube in which a deflection device according to the prior art is installed;

FIG. 16 is a front view of the deflecting device of FIG. 15 as seen from the electron gun direction. FIG.                 

17 is a cross-sectional view of a cathode ray tube showing the case where the electron gun is fixed in a state inclined in the right direction of the drawing in the manufacturing process with respect to the tube axis of the cathode ray tube;

Fig. 18 is a sectional view of a cathode ray tube showing a case where the scanning trajectory of the electron beam is adjusted by CPM.

Fig. 19 is a schematic diagram showing a pattern of screen distortion in a cathode ray tube according to the prior art.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cathode ray tubes used in color televisions and the like, and more particularly, to a deflection apparatus mounted on a cathode ray tube to deflect an electron beam emitted from an electron gun to a fluorescent surface.

Fig. 15 is a partial cutaway sectional view of a cathode ray tube provided with a deflection device according to the prior art, and Fig. 16 is a view of the deflection device of Fig. 15 viewed from the electron gun direction.

As shown in the drawing, the cathode ray tube connects the panel 3 having the fluorescent surface 1 formed therein, the neck portion 7 having the electron gun 5 mounted therein, and the panel 3 and the neck portion 7 connected thereto. The funnel 9 is integrally coupled to each other, and the shadow mask 11 is fixed to the inside of the panel 3 by a coupling means (not shown) facing the fluorescent surface 1, and the funnel ( On the outer periphery of 9), a deflecting device 17 is provided which deflects the electron beam 15 emitted from the electron gun 5.

With this structure, the electron beam 15 emitted from the electron gun 5 is deflected by the magnetic field generated by the deflecting device 17, passes through the hole 11a of the shadow mask 11, and forms the fluorescent surface 1 on the fluorescent surface 1. By colliding, the fluorescent screen 1 is made to emit a predetermined image.

Here, in the deflection device 17, a horizontal deflection coil 21 and a vertical deflection coil 23 are provided inside and outside the separator 19, with the separator 19 as an insulator interposed therebetween, and the separator 19. The outer core of the ordinary core 25 is configured to surround the vertical deflection coil 23. One side of the deflecting device 17 facing the electron gun 5 is a coma coil 27 which is disposed facing the tube axis Z of the cathode ray tube.

The coma coil 27 has a configuration in which a bobbin 31 made of plastic is attached to a magnetic piece 29 made of a magnetic material such as a silicon steel sheet, and the coil 33 is wound around the bobbin 31. In addition, on the separator 19, a magnetized magnetic substance, that is, a CPM (Convergence Purity Magnet) 35, which is formed in a substantially annular shape adjacent to the coma coil 27, is rotatably installed.

The deflection device 17 having such a configuration determines the fixed position on the funnel 9 while observing the matching relationship of the electron beam 15 to the entire fluorescent surface 1, that is, the landing state of the electron beam, and is mounted at the determined position. After that, alignment adjustment is performed to adjust the deviation of the electron beam.

FIG. 17 is a cross-sectional view of the cathode ray tube showing a case in which the electron gun 5 is fixed to the tube axis Z of the cathode ray tube in a state inclined in the right direction of the drawing during the manufacturing process, in which case the electron beam 15 is According to the inclination degree of the electron gun 5 is moved to the right direction of the screen.

When the electron beam 15 moves in one of the right and left directions with respect to the fluorescent surface 1 as described above, the electron beam 15 reaching the fluorescent surface 1 by the magnetic field generated by the magnetized magnetic body by rotating the CPM 35. FIG. 18 illustrates a case in which the position of is adjusted and the landing of the electron beam 15 is adjusted by the CPM 35.

However, adjusting the position on the fluorescent surface 1 where the electron beam 15 arrives as a magnetic field of the CPM 35 rather than a deflection magnetic field causes a mismatch between the magnetic field generated in the deflection device 17 and the mechanical position of the electron beam 15. As a result, when the fluorescent surface 1 is observed from the front, the deflection screen due to the deflection magnetic field is displaced from the fluorescent surface 1, resulting in a screen displaced in the direction in which the electron beam is inclined.

That is, when the electron gun 5 is mounted inclined in the right direction, as shown in FIG. 19, the deflection screen becomes larger in the right area of the screen and becomes smaller in the left area, resulting in screen distortion in which the horizontal line is inclined.

At the same time, the three R, G, and B electron beam scanning trajectories required to implement the color show that the R electron beam located at the rightmost of the three electron beams in the horizontal axis (X) of the cathode ray tube becomes wider in the right area of the screen. In the leftmost B electron beam, the amplitude is narrowed in the left region of the screen, and color shift is caused mainly by this phenomenon.

As described above, in the deflecting device 17 according to the related art, the screen quality is determined according to the mounting state of the electron gun 5. In particular, when the electron gun 5 is mounted at an angle, the screen distortion and color shift occur. This causes a significant problem that deteriorates the screen quality.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a deflection device for a cathode ray tube that can correct the deterioration of the screen quality due to misalignment of the electron gun, not the magnetic field of the CPM, but the magnetic field of the deflection device. have.

In order to achieve the above object, the present invention,

A separator that is an insulator, a horizontal deflection coil disposed inside the separator, a vertical deflection coil disposed outside the separator, and a core cooperatively disposed with the vertical deflection coil outside the separator; It includes a coma coil disposed opposite to one side of the separator to correct the screen distortion due to misalignment of the electron gun,

A magnetic piece including a body in which the coma coil has left and right protrusions at both ends thereof; It includes a plurality of coils wound on the magnetic piece, provides a deflection device for the cathode ray tube is supplied with a different size of current to each coil.

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

1 is a front view of a deflection device according to a first embodiment of the present invention, and FIG. 2 is a right side view of the deflection device shown in FIG.

As shown in the drawing, the deflector 2 includes a separator 4 which is an insulator, horizontal deflection coils 6 and vertical deflection coils 8 which are provided inside and outside the separator 4, and the vertical deflection coils. A conical core 10 which encloses (8), on the one side of the separator 4 facing the electron gun (not shown) when the deflection device 2 is mounted on the tube of the cathode ray tube, ie with reference to FIG. The coma coil 12 is located on the left side of the deflecting device 2.

The coma coil 12 has a pair of coils 16a, each of which the magnetic pieces 14 are symmetrically disposed about the horizontal axis X of the cathode ray tube, and which are individually wound on the left and right sides of the magnetic pieces 14. 16b). (See Figures 3 and 4)

The magnetic piece 14 has an approximately E-shape having a central protrusion 14d at the center of the body 14c having left and right protrusions 14a and 14b at both ends thereof. 14d is a height h and a width w of the left and right protrusions 14a and 14b of the body 14c, and the height h 'of each of the left and right protrusions 14a and 14b. It is set smaller than the width w '. (h <h ', w <w')

In addition, a pair of coils 16a and 16b wound on a plastic bobbin 18 are individually positioned on the left and right sides of the body 14c around the central protrusion 14d. In the magnetic piece 14 disposed above (X), the coils located on the left and right sides of the central protrusion 14d are called the first coil 16a and the second coil 16b, respectively, and the horizontal axis ( In the magnetic piece 14 disposed below X), the coils located on the right and left sides of the central protrusion 14d are referred to as first coil 16a and second coil 16b, respectively.                     

The operation of the coma coil 12 having the above-described configuration will be described below.

FIG. 5 is a diagram illustrating a magnetic flow generated in the coma coil 12 when the same current is supplied to the first coil 16a and the second coil 16b. FIG. 6 illustrates an electron beam generated by the magnetic field. In this case, the magnetic force is not formed by the central protrusion 14d of each magnetic piece 14, and the left and right protrusions 14a and 14b of each magnetic piece 14 are stimulated. Magnetic field is formed.

That is, since the intensity of the magnetic field generated by the current flowing through the first coil 16a and the magnetic field strength of the second coil 16b are the same, for example, the right side of the first and second coils 16a and 16b. When the first coil 16a and the second coil 16b are respectively wound so that the ends and the left ends are the S pole and the N pole, and the current is supplied to these coils, the N pole of the first coil 16a is wound. The magnetic field is not generated by the central protrusion 14d which the S poles of the second coil 16b face.

Accordingly, the coma coil 12 has the same magnetic poles of the left and right protrusions 14a and 14b of the magnetic pieces 14 facing each other on the horizontal axis X. In this example, the right side of the magnetic pieces 14 is the same. The protrusion 14b forms an N pole, the left protrusion 14a becomes an S pole, and forms a so-called six-pole magnetic field in which the right side on the horizontal axis X is the S pole, and the left side on the horizontal axis X is the N pole.

Therefore, in FIG. 6, the lines of magnetic force generated in the up and down directions of the drawings do not affect the electron beams in opposite directions, but the lines of magnetic force in the horizontal direction generated from the left and right protrusions 14a and 14b of the respective magnetic pieces 14 Since the magnetic beams are in the same direction, the electron beam is forced upward. (See arrow in FIG. 6)

At this time, if the winding directions of the first and second coils 16a and 16b are reversed such that the magnetic poles 14 and the magnetic poles on the horizontal axis X are reversed, the force received by the electron beam is also reversed. You can be strengthened.

Next, when the current having different magnitudes is supplied to the first coil 16a and the second coil 16b, the magnetic field flow generated in the coma coil 12 and the influence of the electron beam by this magnetic field are affected. 7 and 8 respectively.

In the illustrated coma coil 12, a larger current is supplied to the first coil 16a in the magnetic piece 14 disposed above the horizontal axis X with respect to the horizontal axis X, and the horizontal axis X is provided. In the magnetic piece 14 disposed below, a larger current is supplied to the second coil 16b. In this case, a stronger magnetic field is generated on the coil side provided with the larger current.

In this way, when different currents are supplied to the first coil 16a and the second coil 16b, not only the left and right protrusions 14a and 14b of each magnetic piece 14 but also the central protrusion 14d is stimulated. This also generates a magnetic field.

That is, the central protrusion 14d of each magnetic piece 14 becomes a new magnetic pole, and a new magnetic field is generated between the central protrusion 14d and the left protrusion 14a of the magnetic piece 14, for example, each magnetic field. The right protrusion 14b of the piece 14 becomes the N pole, the left protrusion 14a becomes the S pole, the right side on the horizontal axis X becomes the S pole, and the left side on the horizontal axis X becomes the N pole. The center projection 14d is the N pole, and the center on the horizontal axis X is the S pole.                     

Referring to FIG. 8, a magnetic field relationship generated between the center protrusion 14d and the left protrusion 14a of each magnetic piece 14 among the multi-pole magnetic fields is a magnetic force line generated in the vertical direction based on the horizontal axis X. They are canceled because they are in opposite directions and do not affect the electron beam (see the dashed arrows), but the magnetic force lines generated in the horizontal direction between the center protrusion 14d and the left protrusion 14a of the magnetic piece 14 are the same direction, This magnetic force line causes the electron beam to be forced upward. (See solid arrow)

Therefore, the force affecting the electron beam deflects the electron beam upwards, and in particular, the magnetic beam shown in FIG. 8 causes the electron beam to receive a larger upward force with respect to the left area of the screen.

Of course, at this time, if the winding directions of the first and second coils 16a and 16b are reversed so that the magnetic poles 14, the central protrusion 14d, and the magnetic poles on the horizontal axis X are reversed, the force received by the electron beam It can also be reversed and deflected downwards.

As a result, in the screen distortion in which the right area of the screen is enlarged and the left area is reduced, as shown in FIG. 19, the coma coil 12 enlarges the electron beam proceeding to the left area of the screen in the vertical direction so that the horizontal lines Correct the tilt.

At the same time, the coma coil 12 reduces the amplitude of the R electron beam located at the rightmost side among the three R, G, and B electron beams on the horizontal axis X of the cathode ray tube, and widens the amplitude of the B electron beam at the leftmost position. The color shift due to the difference between the R electron beam scanning trajectory and the B electron beam scanning trajectory is corrected.

9 is a front view of a coma coil according to a second embodiment of the present invention, and FIG. 10 is an enlarged view of the magnetic piece shown in FIG. 9.

In the coma coil 20 according to the second embodiment, each magnetic piece 22 has a central portion 22a and is formed in an approximately M shape, and has a central portion in the magnetic body 22 disposed above the horizontal axis X. The first coil 24a and the second coil 24b are positioned on the left and right sides of the 22a, respectively, and to the left and right of the central portion 22a in the magnetic piece 22 disposed below the horizontal axis X, respectively. The second coil 24b and the first coil 24a are located.

As a result, the first and second coils 24a and 24b disposed on the respective magnetic pieces 22 are not positioned side by side on the horizontal axis X, but are disposed at a predetermined angle, and at this time, the first and second coils ( 24a and 24b are wound on the bobbin 26 and positioned.

Since the coma coil 20 according to the second embodiment does not need to form a separate center projection on each magnetic piece 22 as compared to the coma coil 12 of the previous embodiment, the coil is formed by the space occupied by the center projection. It can further wind, and the efficiency can be improved.

11 is a circuit diagram of a coma coil according to a third embodiment of the present invention. In the coma coil 28 of the present embodiment, the first coil 30a and the second coil 30b are connected in series, and the first and second coils 28a are connected in series. The variable resistor 34 is connected to the connection point 32 which is an intermediate position of the second coils 30a and 30b to control the amount of current flowing through the first and second coils 30a and 30b.

That is, when the variable resistor 34 is set to a median value, and the resistance values at the connection points 32 of the first and second coils 30a and 30b are the same, the first coil 30a and the second coil 30b are the same. The amount of current flowing through is equal. However, for example, when the variable resistor 34 is set to increase the resistance of the first coil 30a side, the current flowing through the first coil 30a becomes larger than the current flowing through the second coil 30b. The intensity of the magnetic field generated in the one coil 30a is increased, and as a result, the influence of the first coil 30a on the electron beam is increased to deflect the electron beam in the direction of the first coil 30a.

12 is a circuit diagram of a coma coil according to a fourth embodiment of the present invention. In the coma coil 36 of the present embodiment, the first coil 38a and the second coil 38b are connected in parallel, and the first coil ( The variable resistor 40 is connected to one connection point of 38a) and the 2nd coil 38b.

In the above structure, the amount of current flowing through the first coil 38a and the second coil 38b can be controlled through the variable resistor 40. For example, the variable resistor 40 increases so that the resistance of the first coil 38a side increases. ), The current flowing through the first coil 38a is smaller than the current flowing through the second coil 38b, thereby increasing the intensity of the magnetic field generated in the second coil 38b. As a result, the influence of the second coil 38b on the electron beam is increased to deflect the electron beam in the direction of the second coil 38b.

By using the wiring structure according to the third and fourth embodiments of the present invention as described above, it is possible to simply control the generated magnetic field of the coma coil, and adjust the variable resistors 34 and 40 to display the screen of the cathode ray tube. Distortion can be easily corrected.

FIG. 13 is a front view of a coma coil according to a fifth embodiment of the present invention, and FIG. 14 is a diagram illustrating a magnetic field flow generated in the coma coil of FIG. 13.

The coma coil 42 provided in the present embodiment increases the number of windings of any one of the first coil 44a and the second coil 44b, and in the drawing, for example, based on the horizontal axis X of the cathode ray tube. In the magnetic piece 46 disposed above the horizontal axis X, the number of turns of the second coil 44b is increased more than the number of turns of the first coil 44a, and the magnetic piece disposed below the horizontal axis X. The structure in which the number of turns of the first coil 44a is increased from the number of turns of the second coil 44b at 46 is illustrated.

In addition, in the present exemplary embodiment, the variable resistors 34 and 40 may be connected to the first and second coils 44a and 44b at a central position thereof.

When the number of windings of the first coil 44a and the second coil 44b is adjusted in this way, when the same DC current is supplied to the first coil 44a and the second coil 44b, the upper portion of the horizontal axis X More current flows through the second coil 44b through the magnetic piece 46 positioned in the upper portion, and more current flows through the first coil 44a through the magnetic piece 46 located below the horizontal axis X. . Therefore, the strength of the magnetic field for the coil having a large number of windings is strengthened (see FIG. 4), so that the electron beam is deflected in the right direction with reference to FIG. 14.

By adjusting the number of windings of the first coil 44a and the second coil 44b in this way, the magnetic field generated by the coma coil can be easily controlled, which has an effective effect of correcting the screen distortion of the cathode ray tube. .

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, in the coma coil provided in the deflection apparatus, a plurality of coils are individually wound on each magnetic piece, and the current flowing through each coil is controlled to correct screen distortion caused by misalignment of the electron gun. Improve screen quality.

Claims (7)

A separator that is an insulator; A horizontal deflection coil disposed inside the separator; A vertical deflection coil disposed outside the separator; A core disposed in association with the vertical deflection coil on an outer side of the separator; And A coma coil disposed at one side of the separator to correct a screen distortion caused by misalignment of the electron gun, The coma coil, A pair of magnetic pieces positioned above and below the horizontal axis with respect to the horizontal axis of the cathode ray tube, and including a body having left and right protrusions at both ends thereof in the horizontal axis direction; And A pair of coils wound around each of the pair of magnetic pieces on the left and right sides of the vertical axis with respect to the vertical axis of the cathode ray tube, For the cathode ray tube for generating a six-pole magnetic field selectively in any one of the left region and the right region of the electron beam trajectory by supplying a current of different magnitude to the pair of coils located in the same magnetic piece of the pair of magnetic pieces Deflection device. The method of claim 1, The magnetic piece is a deflection device for cathode ray tubes to form a central projection having a height and width smaller than the left and right projections in the central portion of the body. The method of claim 1, The magnetic piece is a deflection device for cathode ray tubes formed by bending the central portion of the body. The method of claim 1, The coils are deflecting device for the cathode ray tube is wound around the bobbin installed in the body. The method of claim 1, And the coils are connected in series and have a wiring structure in which a variable resistor is connected between the connection sites. The method of claim 1, And the coils are connected in parallel and have a wiring structure in which a variable resistor is connected to one end of the connection portion. The method of claim 1, A deflection apparatus for cathode ray tubes in which the coils have different winding counts.

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