KR910000348B1 - Static convergence assembly - Google Patents

Abstract

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Description

Concentrated assembly

1 is a rear perspective view of a concentrating assembly constructed in accordance with the present invention mounted on the neck of a cathode ray tube.

2 is a cross-sectional view taken along line 2-2 of the concentration assembly shown in FIG.

3 is a cross-sectional view taken along line 3-3 of the concentration assembly shown in FIG.

4 is a cross-sectional view taken along line 4-4 of the concentration assembly shown in FIG.

5 is a cross-sectional view taken along line 5-5 of the concentration assembly shown in FIG.

6 is an enlarged front view of another embodiment of a focusing assembly constructed in accordance with the present invention suitable for use with a CRT having an “in-line” electron gun configuration.

FIG. 7 illustrates another embodiment of a concentration assembly suitable for use with a CRT having an “in-line” electron gun configuration with the concentrated magnet of FIG.

FIG. 8 is an enlarged partial side view of the focusing assembly shown in FIG. 7 to show the magnetic field direction resulting when the concentrated magnet is positioned parallel to the axis of the CRT neck.

FIG. 9 is a view as shown in FIG. 8 to show the direction of the magnetic field caused when the concentrated magnet is located in a direction perpendicular to the axis of the CRT neck.

FIG. 10 is a view as shown in FIGS. 8 and 9 to show the direction of the magnetic field caused when the concentrated magnet is positioned in an oblique direction with respect to the axis of the CRT neck.

* Explanation of symbols for main parts of the drawings

10: concentrated assembly 11: neck

14 screen 15 electron gun cooking body

16: deflection yoke 17, 18, 19: electron gun

22, 51: color 27, 28, 29, 52, 53, 58: extension arm

30, 31, 32, 54, 55, 59: stem 33, 43, 35: block

36: hole 37: channel

38, 39, 40, 56, 57, 60: magnets 38a, 39a, 40a, 47: axis

41, 42, 43: recess 44, 45 46: inclined channel

48, 49, 50: control panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to static convergence assemblies for cathode ray tubes (hereinafter referred to as CRTs), in particular, where a plurality of magnetic elements are held in a constant angular direction with each other, and a CRT neck is also provided. And a distance between the magnetic elements and the orientation of the magnetic elements relative to the CRT neck.

In general, in a color television receiver, when three independent electron beams are combined with red, green, and blue phosphor dot arrays provided on the surface of the screen, color images are displayed on the screen. Screening of images is carried out by independently adjusting and controlling the phosphor dots of primary colors. Thus, for this reason, the color CRT has a shadow mask that allows individual phosphor dots to be illuminated only by electrons arriving from a particular direction. However, because the paths of the three battery beams generated within the CRT are different, the CRT must be properly configured and illuminated, so that the CRT performs proper operation, allowing each beam to illuminate only phosphor dots of a particular color. And a wide range of colors that the viewer can perceive can be used when each beam is modulated with appropriate information.

For the generation of three electron beams, color CRTs are provided with three electron guns, typically arranged in a straight "in-line" pattern or a triangular "delta" pattern. Regardless, the CRT works properly when the three electron beams are focused towards a single point on the shadow mask. Therefore, in order to provide such a concentration, various apparatuses which intend to independently control the static position of each electron beam have been developed conventionally.

In one such conventional concentrator, a plurality of generally circular rings having a plurality of magnetic pole pairs are arranged around the CRT neck, and the rings can rotate independently around the CRT neck either coincident with each other or vice versa. Groups together. However, this concentrator is effective in operation but difficult to configure and adjust, and has a bad effect on production cost.

In another conventional concentrator, a plurality of parallel and straight ferrite rods, each having a plurality of pole pairs formed therein, are tangentially mounted with respect to the CRT neck, and each rod has its axial and rotational positions Adjusted so that non-concentration can be easily achieved. By the way, although this concentrator is considerably simpler in operation and configuration than the above-mentioned device, some complexity remains, and there is still room for improvement.

It is therefore an object of the present invention to provide a newly improved CRT focused assembly.

It is a further object of the present invention to provide a CRT focused assembly that is simple and economical to manufacture and adjust and that non-crown concentration can be effectively adjusted.

It is another object of the present invention to provide a CRT focusing assembly suitable for use with "in-line" and "delta" electron gun configurations.

In summary, the concentrated assembly for use with a CRT in the form of a generally elongated neck has a magnet for generating a magnetic field, the magnet having a pair of spaced apart magnetic poles, these The stimulus axis is defined between stimuli. The focusing assembly also has mounting means for positioning the magnet adjacent to the CRT neck, wherein the selected radiation among the radiation extending radially from the pole axis and the neck is positioned in a vertical relationship. The magnet may be mounted to rotate around the selected radiation and to be positioned along the selected radiation. Thus, with such mounting, the strength and direction of the magnetic field generated by the magnet in the CRT neck can be adjusted.

Features of the invention, which are considered novel, are described in detail in the appended claims. The invention can be best understood from the following description with reference to the accompanying drawings, along with other objects and their advantages. Like reference numerals in the drawings denote like elements.

Referring to the drawings, in particular to FIGS. 1, 2 and 3, the concentration assembly 10 is mounted as shown on the elongate neck 11 of a conventional television CRT 12. According to a conventional design, the CRT 12 generally has a hollow glass tube 13 that slopes from the flat, visible screen 14 towards the neck 11. Color images are formed on the screen 14 by three electron beams generated by the electron gun assembly 15 (FIG. 3) located in the neck 11. The deflection yoke 16 surrounds a part of the neck 11 and serves to generate a display raster by magnetically deflecting the electron beam across the screen 14 horizontally and vertically in a known manner. .

Red, green and blue phosphor dots are coated on the inner surface of the screen, and a shadow mask (not shown) located adjacent to the phosphor coating is characterized by the fact that the individual phosphor dots are in the three electron beams generated by the electron gun assembly 15. It functions to be illuminated by only one. Proper color balance on the color being displayed is achieved when phosphor dots of a particular color are illuminated by only one of the three electron beams. This is achieved when three electron beams are concentrated so that each electron beam collides at the same point with respect to the shadow mask at all times during raster scanning. The focusing assembly 10 magnetically deflects each electron beam so that a desired concentration is obtained.

As shown in FIGS. 2 and 3, the neck 11 generally has a circular hollow cross section. The electron gun assembly 15 is arranged in a triangle or "delta" pattern and has three electron guns 17, 18 and 19 which generate electron beams for respectively illuminating red, green and blue phosphor dots. . The plurality of acceleration electrodes 20 and 21 are located in front of the electron gun assembly 15, and function to shape and modulate each electron beam into a small amount of video information. The focusing assembly 10 is positioned as shown on the neck 11 between the electron gun assembly 15 and the screen 14.

The concentrated assembly 10 is a electrically insulating, nonmagnetic, and semi-flexible material, for example, a collar that is well formed of nylon and surrounds a portion of the outer surface of a generally circular neck 11 (collar) 22. It is provided. The collar 22 extends substantially the entire circumference of the neck 11 and terminates in a pair of flanges 23 and 24 that are spaced apart from one another and extend outward in parallel. A threaded member, for example a sheet metal screw 25 extends through these flanges 23 and 24. The screw shank 26 of the screw 25 extends through the first hole of the flange 24 to mate with a second hole formed in the flange 23. Preferably, the first hole is made somewhat larger than the second hole so that only the flange 23 is threaded into the shank 26. As the screw 25 rotates, the flanges 23 and 24 are pulled in such a way as to approach each other, causing the concentrated assembly to be held in place.

The focusing assembly 10 also has a plurality of extension arms extending outwardly from the collar 22. In the case of a concentrated assembly intended for use with a CRT having a "delta" electron gun configuration, the three extension arms 27, 28 and 29 are shown in FIGS. As provided, they are spaced apart from each other at an angle of 120 °. As also shown in FIGS. 2, 3 and 5, each extension arm is generally rectangular in shape and cross section and is integrally formed with the collar 22.

The focusing assembly 10 extends along the extension arms 27, 28, and 29, but generally includes a plurality of elongated mounting means, eg, stems 30, 31 extending in parallel with these extension arms. And 32. As shown, each stem generally has a circular cross section and is longer than the extension arms, these stems are located along the extension arms. It is made of the same material.

Adjacent to the outermost end of each extension arm, generally cube shaped blocks 33, 34 and 35 are formed. A circular hole 26 is formed through each block, which extends in a direction parallel to the longitudinal axis of the associated extension arm but spaced apart from the extension arm. A channel 37 is formed through the side of each block such that the block has a somewhat U-shaped cross section as shown in FIG. The dimensions of the aperture 36 and the channel 37 are such that the stems 30 to 32 can be moved and held in the selected rotational and longitudinal position relative to the recognized extension arm as appropriately accommodated in each block. By way of example, as shown by arrows and dashed lines with respect to stem 32 in FIG. 2, each stem may be longitudinally displaced over a range along an associated extension arm.

According to the present invention, magnetic field generating elements, for example, permanent magnets 38, 39 and 40 are provided at the innermost ends of the respective stems 30 to 32. Each magnet generally has a cylindrical shape and has a length that is approximately equal to the diameter of the stem to which it is mounted. A pair of magnetic poles are formed at both ends of each magnet, and magnetic pole axes 38a, 39a, and 40a are defined between these magnetic poles. Each magnet is mounted such that its pole axis is perpendicular to the longitudinal axis of the associated stem and is housed in a circular recess 41, 42 or 43. Inclined channels 44, 45 and 46 are formed at the ends of each stem and, as shown, extend into adjacent recesses such that each permanent magnet can be pressed into the recess through the end of the stem. The inclined channels 44-46, when manufactured, simply press the stem downwards against the magnets so that each magnet is forced into the recesses so that the magnets can be received in the recesses. As shown in FIG. 2, the end of each stem preferably extends slightly beyond the magnet and is shaped to match the contour of the CRT neck 11.

In use, the focusing assembly 10 is positioned on the neck 11 such that each extension arm extends along the radiation defined by the central axis 47 of the neck and one of the electron guns 17-19. The screw 25 is then tightened to fix the focusing assembly in the desired position. Next, the rotational and longitudinal positions of each stem 30 to 32 are adjusted by displacing the stem along the arrow directions shown in FIGS. 2 and 5. Such adjustment has the effect of changing the strength and direction of the magnetic field generated in the neck 11 by each permanent magnet, and also has the effect of changing the path of the electron beam generated by the electron guns 17 to 19. Since each permanent magnet is closer to any one of the three electron beams, the adjustment of a single stem mainly affects the position of the nearest beam. Thus, the focusing assembly 10 provides independent adjustment for each of the three electron beams, thereby allowing the centralized adjustment to be simplified. To further facilitate this adjustment, the simplified length of each stem causes the simplified controls 48 to 50 to protrude beyond the ends of the extension arm when each stem is fully pressed towards the neck 11.

6 illustrates a CRT with an "in-line" electron gun configuration and a focused assembly adapted for further use. As shown, the electron guns 17, 18 and 19 of this CRT are arranged linearly along the diameter of the neck 11. The focusing assembly has a collar 51 having a pair of extension arms 52 and 53, which pair of extension arms 52 and 53 are 180 ° spaced apart from each other to radiate outward from the collar 51. Extend in the direction. The collar 51 and the extension arms 52 and 53 have a similar configuration for the corresponding parts in the embodiment according to the "delta" configuration shown in FIG. The pair of stems 54 and 55 are mounted along the extension arms 52 and 53 in the manner described above and at the ends adjacent to the neck 11 are provided permanent magnets 56 and 57. .

In use, the collar 51 is positioned so that the extension arms 52 and 53 line up with the electron guns 17-19, as shown. When so positioned, the permanent magnets 56 and 57 function to cause the electron beams generated by the electron guns 17 and 19 to magnetically deflect toward the beam generated by the intermediate electron gun 18. Is done. In most cases, adjustment by the assembly shown in FIG. 6 will be sufficient to make the non-concentration satisfactory.

If adjustment in another aspect is required, the concentration assembly shown in FIG. 7 may be utilized. In such a configuration, a third extension arm 58 is provided on the opposite side of the screw 25 at an equiangular interval of 90 ° circumferentially from the extension arms 52 and 53. The stem 59 may be the same as the other stems shown and described, extending along the extension arm 58 and provided to the permanent magnet 60 at the end closest to the neck 11. The magnetic field generated by the permanent magnet 60 mainly affects the vertical position of the beam generated by the electron gun 18, allowing accurate concentration to be done in case of slight error in the alignment of the electron guns. The configuration of the assembly shown in FIG. 7 is similar in all respects to that shown in FIG.

8, 9 and 10 show the magnetic field direction when one of the stems (eg, stem 30) is rotated. In FIG. 8, the magnetic pole axis 38a of the permanent magnet 38 is parallel to the axis 47 of the neck 11. Therefore, the magnetic field lines 61 of the magnetic field generated by the magnet are parallel to the electron traveling passages in the respective electron beams. It is well known that the physical properties of charge particle movement in a direction parallel to the magnetic field lines of a static magnetic field are not affected. Thus, when the magnet is positioned, as shown in FIG. 8, the magnetic field generated by the magnet will have little or no effect on the position of the beam on the visible screen of the CRT.

In Fig. 9, the magnet is positioned such that its pole axis 38a is perpendicular to the axis 47 of the neck. When so positioned, the lines of magnetic force will be substantially perpendicular to the path of the beam electrons, so that each electron will be subjected to a vertical force as it passes through the magnetic field. In this way, the electron beam is deflected upward or downward on the visible screen according to the specific direction of the magnet. Rotating the magnet 180 ° will reverse the direction of the beam deflection.

In FIG. 10, the magnetic pole axis 38a of the permanent magnet has a predetermined angular direction with respect to the axis of the neck, so that the magnetic field generated in the neck will include parallel and vertical components. The beam deflection depends mainly on the strength of the vertical magnetic field component and will be largely unaffected by the parallel component. The angular position of the permanent magnet with respect to the neck axis determines the relative strength of the vertical magnetic field component, which in turn affects the degree of deflection of the beam. Thus, the degree of beam deflection varies with the proper rotation of the stem. It will be appreciated that displacing the stem away from the neck of the CRT will reduce the effective field strength within the neck of the CRT, thereby affecting the degree of non-deflection. It will also be appreciated that the rotational position of the focusing assembly itself on the CRT neck will affect the direction of beam deflection and may be adjusted to achieve optimal beam concentration, if desired.

While the configuration of a particular focused assembly has been shown and described, it will be appreciated that various modifications may be made. As an example, although a cylindrical permanent magnet is shown, a long or square magnet may be used successfully. In addition, various means other than flanges 23 and 24 and screws 25 may be used to mount the lumped assembly to the neck of the CRT. Finally, the shapes of the various extension arms, collars and stems are not strictly defined.

Although specific embodiments of the present invention have been described and described, it will be apparent to those skilled in the art that various modifications and variations can be made in various aspects without departing from the invention, and the intention of the appended claims is to be understood as the true spirit and It is intended to cover modifications and variations that fall within the category.

Claims (13)

A cathode ray tube comprising an elongated neck, and one outside, one inside, and one outside electron beam housed within the neck and generally arranged in a linear configuration to define one plane generally in the case of non-deflection A cathode ray tube deflection system having an electron gun assembly having three electron guns, and a concentration assembly, the concentration assembly comprising: a collar detachably mounted to the elongate neck of the cathode ray tube; First and second extension arms extending radially outwardly from the collar and attached to the collar, respectively; First and second mounting means respectively supported by the first and second extension arms, the first and second mounting means being rotatable and longitudinally adjusted relative to the first and second extension arms and extending outwardly from the neck; A first magnet which is in magnetic communication with one of the outer electron beams and is held by the first mounting means, the magnetic poles having magnetic poles defining a first magnetic pole axis; By a adjustment of said mounting means, having a second magnet held by said second mounting means, magnetically in communication with one of said outer electron beams, with magnetic poles defining a second magnetic pole axis And the angle between the first and second magnetic pole axes and the plane is adjusted such that the deflection of the outer electron beams in and out of the plane by the first and second magnets can be varied. . The concentrated assembly of claim 1, wherein the extension arms are spaced 180 degrees apart from each other around the elongated tissue. A concentrated assembly as claimed in claim 1 wherein said first and second mounting means substantially lie in said plane. 2. The extension arm of claim 1, wherein each of the extension arms has a hole such that the mounting means is rotatable and slidable relative to the extension arms as the mounting means can be received therethrough. Concentrating assembly, characterized in that. 5. The method according to claim 1 or 4, wherein each of the mounting means comprises a long stem, the stem being longer than the extension arm such that a circular cross section and a user-operable operation portion are formed beyond the outermost ends of the extension arms. A concentrated assembly characterized in that it has a length. 2. The concentrated assembly of claim 1, wherein each magnet is generally made of a cylindrical permanent magnet, and wherein each mounting means has a recess for receiving the magnet. 7. A concentrated assembly as claimed in claim 6 wherein each mounting means comprises an inclined channel open into the recess and allows the magnets to be pushed into the recess through the inclined channel. A cathode ray tube comprising an elongated neck, and one outside, one inside, and one outside electron beam housed within the neck and generally arranged in a linear configuration to define one plane generally in the case of non-deflection A cathode ray tube deflection system having an electron gun assembly having three electron guns, and a concentration assembly, the concentration assembly comprising: a collar detachably mounted to the elongate neck of the cathode ray tube; First and second extension arms extending radially outwardly from the collar and attached to the collar and spaced apart from each other by 180 °; A first elongate stem positioned within said first extension arm, said first elongate stem being rotatable and longitudinally adjustable within said first extension arm; A second elongate stem positioned within said second extension arm, said second elongate stem being rotatable and longitudinally adjustable within said second extension arm; A first magnet magnetically in communication with one of the outer electron beams, the first magnet being held at one end of the first stem with magnetic poles defining a first magnetic pole; Having a second magnet held at one end of the second stem, magnetically in communication with one of the outer electron beams, and having magnetic poles defining a second magnetic axis, by adjustment of each stem, And the angle between the first and second magnetic pole axes and the plane is adjusted such that the deflection of the outer electron beams in and out of the plane by the first and second magnets can be varied. 9. The concentrated assembly of claim 8, wherein said first and second stems lie substantially in said plane. 9. The focusing apparatus of claim 8, wherein each of the extension arms has a hole through which the elongated stem is received so that each stem is rotatable and longitudinally slidable relative to each of the extension arms. Assembly. 9. The concentrated assembly of claim 8, wherein each stem is longer than each extension arm such that an operation portion operable by a user is formed beyond the outermost end of each extension arm. 9. The concentrated assembly of claim 8, wherein each of said magnets is generally a cylindrical permanent magnet, said each stem including a recess adjacent said one end for receiving said magnet. 13. The concentrating assembly of claim 12, wherein each stem includes an inclined channel open into the recess and allows the magnets to be pushed into the recess through the inclined channel.

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