KR20040035362A - Deflection apparatus for cathode ray tube - Google Patents

Abstract

PURPOSE: A deflection device is provided to correct a raster distortion and electron beam spot distortion caused due to deflected magnetic fields. CONSTITUTION: A deflection device comprises a separator serving as an insulator; a pair of horizontal coils disposed in the separator; a core arranged outside from the separator; and a pair of vertical coils(8) connected to the core and arranged outside from the separator. Each of the horizontal coil and the vertical coil is divided into a deflection coil unit and a convergence coil unit including a lengthwise portion(12A) having a predetermined length, a small aperture connector(12B) for connecting an end of the lengthwise portion, and a large aperture connector(12C) for connecting the other end of the lengthwise portion.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection apparatus for a cathode ray tube, and more particularly, to a deflection apparatus applicable to a monochrome cathode ray tube provided in a projection display device to implement a monochromatic screen.

In general, a projection display device using a cathode ray tube includes three monochrome cathode ray tubes for displaying a single color screen of R (red), G (green), and B (blue), and a projection screen for monochrome images respectively implemented in these cathode ray tubes. An optical system for synthesizing a color image by enlarging and projecting with a main component is a main configuration.

Such a monochrome cathode ray tube includes a deflection coil for generating a deflection magnetic field, and a convergence coil for adjusting the position of the electron beam. That is, when a screen distortion occurs in the process of realizing an image on the projection screen by deflecting the electron beam by the magnetic field generated by the deflection coil, the convergence coil is operated to correct the screen distortion.

As a result, the conventional monochrome cathode ray tube includes a deflection coil and a convergence coil as a separate deflection device, or in order to simplify the appearance of the cathode ray tube, a horizontal and vertical deflection coil is mounted on the first half of the deflection device, A vertical convergence coil is mounted to mechanically integrate these coils.

However, in all of the above-described configurations, when the electron beam is deflected by the deflection magnetic field to realize an image, the convergence coil only corrects the screen distortion by changing the position of the electron beam, and it is impossible to correct the screen distortion caused by the deflection magnetic field itself. .

FIG. 9 is a schematic view of a general projection display device, and illustrates one cathode ray tube positioned in the center of three monochrome cathode ray tubes. The image implemented in the cathode ray tube 1 shown is magnified through the projection lens 3 and projected onto the projection screen 7 through the mirror 5. At this time, the optical axis A of the cathode ray tube 1 has a constant inclination angle θ with the projection screen 7, and the inclination angle θ ₁ of the cathode ray tube optical axis and the projection screen at the upper portion of the projection screen 7 is obtained. A value smaller than the inclination angle θ ₂ at the bottom of the projection screen 7 is shown.

Therefore, before the convergence coil is operated, the image projected onto the projection screen 7 is distorted in the inverted trapezoidal shape as shown in FIG. 10, and the electron beam E / B is distorted in the deflection direction. Therefore, the horizontal beam diameter D _H of the electron beam is increased at the horizontal end of the screen, and the vertical beam diameter D _V of the electron beam is increased at the vertical end of the screen.

Thus, the conventional monochrome cathode ray tube can correct the horizontal and vertical positions of the electron beam by operating a convergence coil, thereby correcting raster distortion, which is a geometric distortion of the image, but spot distortion of the electron beam due to electron beam deflection cannot be corrected. There is a limit.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide a cathode ray tube deflection device capable of correcting electron beam spot distortion caused by a deflection magnetic field together with raster distortion in a monochrome cathode ray tube used in a projection display device. To provide.

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

2 is a schematic diagram of a horizontal coil of a deflecting device according to an embodiment of the present invention.

3 is a wiring diagram of the horizontal coil shown in FIG. 2;

4 is a schematic diagram of a vertical coil of a deflection device according to an embodiment of the present invention.

5 is a schematic diagram showing an electron beam trajectory deflected to the vertical end of the screen in a uniform magnetic field condition.

6 is a schematic diagram showing an electron beam trajectory deflected to the vertical end of the screen in the vertical coil condition shown in FIG.

FIG. 7 is a wiring diagram of the vertical coil shown in FIG. 4. FIG.

8 is a schematic view of a horizontal or vertical coil of a deflector according to another embodiment of the present invention.

9 is a schematic diagram of a typical projection display.

10 is a schematic diagram for explaining distortion of an image projected on a projection screen before the convergence coil is operated.

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

A separator, which is an insulator, a pair of horizontal coils installed inside the separator, a core installed outside the separator, and a pair of vertical coils installed outside the separator in association with the core, wherein the horizontal coil and the vertical coil are a pair It includes a longitudinal direction portion, a small diameter connecting portion for connecting one side end of the longitudinal direction, and a large diameter connecting portion for connecting the other end of the longitudinal direction, divided into a plurality of sections along the winding direction of the wire and its own longitudinal direction and Provided is a deflection device for a cathode ray tube comprising a deflection coil portion and a convergence coil portion having a small diameter connecting portion and a large diameter connecting portion.

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

A separator, which is an insulator, a pair of horizontal coils installed inside the separator, a core installed outside the separator, and a pair of vertical coils installed outside the separator in association with the core, wherein the horizontal coil and the vertical coil are a pair For a cathode ray tube comprising a longitudinal diameter portion, a small diameter connecting portion connecting one end of the longitudinal direction, and a large diameter connecting portion connecting the other end of the longitudinal portion, wherein the electric wire for the deflection coil and the electric wire for the convergence coil are wound simultaneously. Provide a deflection device.

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 apparatus according to an embodiment of the present invention, wherein the deflection apparatus 2 is applicable to a monochrome cathode ray tube provided in a projection display device to implement a monochromatic screen, for example a saddle-saddle- saddle) type deflection device is shown.

The deflector 2 includes a separator 4 as an insulator, a pair of horizontal coils 6 provided inside the separator 4, a pair of vertical coils 8 provided outside the separator 4, and a separator. (4) The basic configuration is a core 10 surrounding the vertical coil 8 from the outside. At least one of the horizontal coil 6 and the vertical coil 8 includes a deflection coil unit for generating a deflection magnetic field and a convergence coil unit for generating a magnetic field for position correction of the electron beam, thereby deflecting in one coil. Simultaneously performs the function of coil and convergence coil.

FIG. 2 is a schematic diagram of the horizontal coil illustrated in FIG. 1, and FIG. 3 is a wiring diagram of the horizontal coil illustrated in FIG. 2, and the configuration and operation of the coil described above will be described using the horizontal coil as an example.

The illustrated saddle-type horizontal coil 6 has a pair of longitudinal portions 12A positioned along the longitudinal axis z of the separator 4 and a small diameter connecting portion connecting one end of the longitudinal portion 12A ( 12B) and the large-diameter connecting part 12C which connects the other end of 12 A of longitudinal directions, and provides the window part 12D inside. As a result, the horizontal coil 6 is produced by winding an electric wire from the inside of the coil facing the window portion 12D to the outside, for example.

In addition, the longitudinal portion 12A of the horizontal coil 6 is provided with holes 14 for controlling the position of the wires, for example, three wire control holes 14a, 14b, and 14c. Therefore, the distribution of the coil can be easily adjusted by changing the position of the hole 14 or adjusting the number of windings of the electric wire from the inside of the coil to the hole.

Here, the horizontal coil 6 according to the present embodiment is divided into two sections along the winding direction of the wire, and has a horizontal deflection nose having its own longitudinal portion 12A, small-diameter connecting portion 12B, and large-diameter connecting portion 12C. It consists of a portion 16 and the horizontal convergence coil portion 18. That is, the horizontal coil 6 winds up a 1st electric wire from the inside of the coil which opposes the window part 12D to the 1st electric wire control hole 14a, for example, and comprises the horizontal convergence coil part 18, and the 1st The 2nd electric wire is wound up from the electric wire control hole 14a toward the coil outer side, and the horizontal deflection coil part 16 is comprised.

As shown in FIG. 3, the second electric wire 16a constituting the horizontal deflection coil part 16 is connected to the horizontal deflection power source 20 with a start point and an end point to generate a horizontal deflection magnetic field. The first wire 18a constituting the horizontal convergence coil unit 18 is connected to a horizontal convergence power supply 22 with a start point and an end point, and receives a current therefrom to correct the magnetic field for moving the position of the electron beam in the horizontal direction. Occurs.

As a result, the deflection apparatus 2 described above simultaneously performs the functions of the horizontal deflection coil and the horizontal convergence coil with one horizontal coil 6, and similarly, the function of the vertical deflection coil and the vertical convergence coil with one vertical coil 8. Can be performed simultaneously. Therefore, the deflection device 2 according to the present embodiment has the advantage that the configuration is simplified, the productivity is high, and the manufacturing cost is low.

Meanwhile, the vertical coil 8 illustrated in FIG. 1 may have a configuration in which two vertical deflection coil parts are separated between one vertical convergence coil part. In this case, the spot distortion of the electron beam can be minimized by controlling the strengths of the barrel-type and pincushion-type magnetic fields generated by the two vertical deflection coil parts, and the configuration and operation thereof will be described below.

4 is a schematic diagram of a vertical coil, in which the vertical coil 8 is divided into three sections along the winding direction of the electric wire, and has its own longitudinal portion 12A, small-diameter connecting portion 12B, and large-diameter connecting portion 12C. It consists of the 1st vertical deflection coil part 24, the vertical convergence coil part 26, and the 2nd vertical deflection coil part 28. As shown in FIG.

In one example, the vertical coil 8 winds up the third electric wire from the inside of the coil facing the window portion 12D to the first electric wire control hole 14a to constitute the first vertical deflection coil part 24, and The 4th electric wire is wound up from the 1st electric wire control hole 14a to the 2nd electric wire control hole 14b, and it comprises the vertical convergence coil part 26, and is made from the 2nd electric wire control hole 14b toward the outer side of a coil. A 5 electric wire is wound up and the 2nd vertical deflection coil part 28 is comprised.

At this time, the first vertical deflection coil portion 24 generates a barrel-shaped magnetic field to guide the electron beam to the longitudinal shape, and the second vertical deflection coil portion 28 generates a pincushion type magnetic field to guide the electron beam to the horizontal shape. There is a tendency. Thus, the deflection device 2 according to the present embodiment adjusts the positions of the first and second vertical deflection coil parts 24 and 28, the number of windings, the coil distribution, and the like to facilitate the barrel type magnetic field and the pincushion type magnetic field distribution. Control, and as a result, spot distortion of the electron beam can be minimized.

5 is a schematic view showing the electron beam trajectory when the electron beam is deflected to the vertical end of the screen under the uniform magnetic field condition. In the illustrated condition, the electron beam E / B is longer in the deflecting magnetic field than the lower end 32 virtual end 30. The upper and lower portions 30 and 32 of the electron beam are kept at the point Q on the focal point trajectory B inside the screen 34, and the upper and lower portions 30 and 32 are changed. Reach the screen 34 to form an electron beam spot.

At this time, as the deflection angle δ increases, the distance from the deflection center P decreases in the focal point trajectory B where the upper and lower ends 30 and 32 of the electron beam coincide. Because it is stronger. Therefore, the spot beam of the electron beam deflected to the vertical end of the screen generates spot distortion, which increases the vertical beam diameter. This phenomenon can be corrected by pincushioning the vertical deflection magnetic field generated in the vertical coil 8 to induce the electron beam in a horizontal shape. .

That is, when the pincushion type vertical deflection magnetic field is generated in the vertical coil as shown in FIG. 6, a force F ₁ that increases deflection is applied to the upper end 30 of the electron beam E / B, and the lower end of the electron beam ( 32) a force (F ₂ ) to suppress the deflection. As a result, the focal point trajectory B where the upper and lower ends 30 and 32 of the electron beam E / B coincide with the screen 34 (B-> B '), and the electron beam reaching the screen 34. The vertical beam diameter of (E / B) is reduced.

However, correcting spot distortion of an electron beam using a pincushion type magnetic field is effective for a large deflection angle, and uses a barrel type magnetic field when the deflection angle is small. The vertical convergence coil unit 26 generates a correction magnetic field for moving the electron beam in the vertical direction, thereby correcting the screen distortion as well as the aforementioned vertical deflection coil unit.

On the other hand, the connection between the deflection coils provided in pairs in a general deflection apparatus is made in parallel connection. In this case, the current flowing through each deflection coil is different due to the difference in the method of winding the wire, the inductance of the coil, the resistance, and the like, and thus it is easy to cause a difference in the strength of the magnetic field generated by each deflection coil. This leads to an imbalance of deflection forces.

As a result, the deflection device according to the present embodiment is a vertical coil, as shown in FIG. 4, divided into three sections along the winding direction of the electric wire, from the inside of the coil facing the window portion 12D toward the outside of the coil. The deflection coil part 24, the vertical convergence coil part 26, and the 2nd vertical deflection coil part 28 are comprised, and wiring of the left vertical coil 8A and the right vertical coil 8B is performed like FIG. .

As shown in Fig. 7, the first and second vertical deflection coil portions 24a, 28a in the left vertical coil 8A are made in the winding directions of the wires in opposite directions, and the first in the right vertical coil 8B. , The two deflection coil portions 24b and 28b are formed in directions in which the wires are wound in opposite directions to each other.

The first vertical deflection coil portion 24a of the left vertical coil 8A and the first vertical deflection coil portion 24b of the right vertical coil 8B are connected in series, and the second vertical deflection of the left vertical coil 8A. The coil portion 28a and the second vertical deflection coil portion 28b of the right vertical coil 8B are connected in series, and the two sections connected in series in this way are connected in parallel with each other.

The vertical deflection current is provided to the first connection portion 36A connecting the first and second vertical deflection coil portions 24a and 28a at the left vertical coil 8A, and the first and second vertical in the right vertical coil 8B. It flows out to the 2nd connection part 36B which connects the deflection coil parts 24b and 28b. As a result, although the winding direction of an electric wire is reversed in the 1st, 2nd vertical deflection coil part in each vertical coil, it shows by the electric current shown in FIG. Each vertical coil generates a magnetic field in the same direction.

Thus, the deflection apparatus 2 which concerns on a present Example connects a pair of 1st vertical deflection coil parts 24a, 24b in series, connects a pair of 2nd vertical deflection coil parts 28a, 28b in series, and is in series. By connecting two connected sections in parallel, it is possible to provide a current having the same magnitude to the left and right vertical coils 8A and 8B. Therefore, the deflecting device 2 according to the present embodiment can control the strength of the magnetic field generated in each vertical coil in the same manner.

On the other hand, the above-described horizontal coil 6 and the vertical coil 8 is divided into several sections along the winding direction of the wire, and some sections are used as deflection coils, while other sections are used as convergence coils. As another embodiment, as shown in FIG. 8, the apparatus may simultaneously wind the deflection coil wire 38 and the convergence coil wire 40 to complete a horizontal coil or a vertical coil.

That is, in FIG. 8, the wire 38 for deflection coils is connected to a deflection power supply (not shown), and the wire for convergence coil 40 is connected to a convergence power supply (not shown). As a result, although two electric wires are wound simultaneously in one coil, the electric current flows in a specific section for each electric wire, thereby obtaining the same effect as the above-described embodiment.

At this time, if the colors of the deflection coil wire 38 and the convergence coil wire 40 are different, or the thicknesses of the wires are different, the distinction between the deflection coil wire 38 and the convergence coil wire 40 can be distinguished. Since it can be made clear, workability improves.

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, according to the present invention, the configuration of the deflection device is simplified by simultaneously performing the functions of the deflection coil and the convergence coil with one coil. In addition, when the deflection coil is separated into two sections between the convergence coils, the strengths of the barrel and pincushion magnetic fields generated by each deflection coil can be easily adjusted. As a result, the screen quality is minimized by minimizing the spot distortion of the electron beam. To improve.

Claims (10)

A separator that is an insulator; A pair of horizontal coils installed inside the separator; A core installed outside the separator; And A pair of vertical coils connected to the core and installed outside the separator, The horizontal coil and the vertical coil, A pair of longitudinal sections having a predetermined length; A small diameter connecting portion connecting one end of the longitudinal direction portion; And It includes a large diameter connecting portion for connecting the other side end of the longitudinal direction, A deflection device for a cathode ray tube, comprising a deflection coil portion and a convergence coil portion, each of which is divided into a plurality of sections along a winding direction of an electric wire, and having its own longitudinal portion, a small diameter connecting portion, and a large diameter connecting portion. The method of claim 1, The deflection device for cathode ray tubes, wherein the horizontal coil and the vertical coil are divided into two sections along the winding direction of the electric wire, and each includes a deflection coil part and a convergence coil part having its own longitudinal portion, a small diameter connecting portion, and a large diameter connecting portion. The method of claim 2, The deflection coil part is connected to a bias power supply to receive a deflection current from a first wire constituting the deflection coil part, and the convergence coil part is connected to a convergence power supply from a second wire constituting the convergence coil part. Deflection apparatus for cathode ray tube provided with. The method of claim 1, The horizontal coil and the vertical coil are divided into three sections along the winding direction of the electric wire, and include a first deflection coil part having its own longitudinal direction part, a small diameter connection part, and a large diameter connection part, a convergence coil part, and a second deflection coil part. Deflection device for cathode ray tube. The method of claim 4, wherein And the first deflection coil portion and the second deflection coil portion are wound in a direction opposite to each other. The method of claim 5, A cathode wire in which a pair of first deflection coil parts respectively provided in a pair of coils are connected in series, a pair of second deflection coil parts respectively provided in a pair of coils are connected in series, and two sections connected in series are connected in parallel to each other. Tolerance deflection device. The method of claim 6, The first deflection coil portion and the second deflection coil portion are connected at a connection point, and a deflection current is provided to a first connection point provided in any one coil of the pair of coils, and the deflection current is a second connection point provided in the other coil. Deflector for cathode ray tube drawn out from. A separator that is an insulator; A pair of horizontal coils installed inside the separator; A core installed outside the separator; And A pair of vertical coils connected to the core and installed outside the separator, The horizontal coil and the vertical coil, A pair of longitudinal sections having a predetermined length; A small diameter connecting portion connecting one end of the longitudinal direction portion; And It includes a large diameter connecting portion for connecting the other side end of the longitudinal direction, A deflection device for cathode ray tubes, in which a wire for a deflection coil and a wire for a convergence coil are simultaneously wound. The method of claim 8, The deflection coil wire is connected to a deflection power source and receives a deflection current therefrom, wherein the convergence coil wire is connected to a convergence power source and receives a convergence current therefrom. The method of claim 8, The deflection coil wire and the convergence coil wire is a cathode ray tube deflection device is different in color and thickness.