KR810000017B1 - Self-converging color television display system - Google Patents

Abstract

A color TV display system comprises a color TV picture tube including a face-plate having deposited thereon groups of three different color phosphor elements. The deflection yoke comprises vertical(31) and horizontal deflection coils (32) disposed around the picture tube between the mask and the gun assembly.

Description

Color TV display automatically focused

1 is a longitudinal sectional view seen from above of a color television display according to the present invention.

FIG. 2 shows a pure deflection magnetic field generated by the deflection yoke shown in FIG.

3a and 3b show the convergence of the electron beam of the device shown in FIG. 1 affected by the deflection magnetic field of FIG.

4 shows the distribution of windings of a donut-shaped deflection yoke that can be suitably used in the apparatus of FIG.

FIG. 5 shows a fully automated assembly suitable for use with the apparatus of FIG. 1. FIG.

FIG. 6 is a diagram showing the configuration of an aperture mask usable for the water tube shown in FIG. 1 and a screen-in coated with a phosphor element. FIG.

The present invention relates to a color television display which substantially concentrates a plurality of electron beams at every point on a scanned raster without the use of a dynamic convergence device.

Most color television receivers currently in use include a screen with a large number of electron beams generated by an electron gun assembly mounted at one end of the water tube and disposed at the other end of the water tube and coated with a number of different color phosphor elements. A cathode ray tube directed towards is used. Color selection means, such as an apertured damask, or an aperture grating or focusing grating, is provided between the screen and the electron gun assembly, whereby the electron beam is shielded by each means, and each of the beams impacts only the corresponding color phosphor element. . A deflection yode placed around the outside of the cathode ray tube is excited to deflect the beam horizontally and vertically to receive a magnetic field for forming a scanning raster on the screen. This basic display is complemented by additional devices for performing dynamic convergence correction. One of the essential requirements of the display device is to focus the beam on all points on the scanning receiver, and when the beam is misconvergence, unwanted colored fringes appear on the edges of each object in the winning scene. . Beam misconvergence can be measured as a separation of crosshath pattern lines made of red, green, and blue lines ideally superimposed on the raster when applying the appropriate test signal to the receiver.

It is common practice to mount means such as permanent magnets around the neck of the water pipe in a predetermined relationship to the beam and to concentrate the beam statically in the center of the raster. However, if the screen is relatively flat and the beam is deflected at the center of the screen, the distance between the screen and the yoke's center of deflection is increased, so that the beam cannot stay focused when deflected at the center of the raster. Moreover, yoke aberrations such as curvature, astigmatism, and coma of images based on magnetic subtitles increase the convergence error.

In general, a device is used that dynamically concentrates the beam as it is scanned throughout the raster. In other words, an electron converging device is usually used in a water tube provided in a delta type electron gun assembly in which three electron guns are arranged at each vertex of an equilateral triangle. In this apparatus, an electromagnet disposed outside the tube excites the magnetic pole pieces in the neck of the water pipe to move their beams in the radial direction. These electromagnets are excited by the waveforms of the horizontal frequency and the vertical frequency, and generate a time varying convergence magnetic field when the beam is scanned. The synthesized waveform obtained by synthesizing the waveforms of the horizontal scan frequency and the vertical scan frequency, for example, to the vertical frequency waveform, is applied to the convergence electromagnet or deflection yoke winding. In some cases, it may be necessary to improve the concentration of the beam in each corner of the stud.

A color television receiver was proposed using a color receiver tube with three types of electron gun assemblies generating in-line beams on a common plane, usually on a horizontal line. Even in this case, the beam must be concentrated as well. For this reason, it is well known to apply a horizontal or vertical waveform of a suitable scan frequency to an electronic or electrostatic convergence device and to concentrate the beam dynamically in the horizontal direction. Such a device is of the type that focuses the beam using deflection yokes. However, when designing a yoke for this purpose, it is necessary to correct another yoke aberration such as coma. However, the apparatus used for the dynamic coma correction is expensive, thereby canceling the cost savings obtained by not using the dynamic convergence apparatus.

It is known that by reducing the distance between alignment beams in the deflection plane of the yoke, unnecessary effects of coma and misconvergence can be reduced. This is accomplished by reducing the spacing between adjacent beamforming parts of the electron gun assembly. As the alignment beam approaches the deflection plane, in order to maintain the screen tolerance between the bright point and the phosphor element printed on the screen, it is necessary to lower the permeation performance of the opening mask for the electron beam. When the permeability of the mask is lowered, the light output of the water tube is lowered. For example, even if a device with a relatively low-definition alignment electron beam system produces proper convergence and acceptable coma, if the resulting image is not bright enough to view comfortably under normal viewing conditions, it is also practical. I can't.

It is an object of the present invention to provide a color television display capable of producing an image having a high brightness which does not require dynamic convergence and coma correction, and which is generally acceptable.

The color television display device which implements this invention is the electron gun assembly which produces | generates three types of alignment beams,

And a color television receiving tube having an aperture mask for shielding these beams and a plurality of phosphor elements having different colors deposited on the screen. The electron gun assembly is selected to give a predetermined maximum spacing between adjacent beams at its yoke deflection surface. In addition, a deflection yoke is mounted to surround the outside of the water pipe so that these beams can be scanned on the screen with rasters. The yoke's deflection winding is chosen to produce negative horizontal isotropic astigmatism and positive vertical isotropic astigmatilm.

In one embodiment of the present invention, the screens of the water tubes consist of repeat-ing groups of phosphor stripes of three different colors adjacent to each other. Aperture masks used with screens have a number of slit-type openings that extend on the same straight line as the phosphor to achieve brighter light output, and more electrons excite each phosphor stripe and produce even greater light output. You can get it.

The electron gun assembly includes at least one common beam forming electrode comprising three openings for aligning these three types of beams.

In addition, the electron gun assembly includes a magnetic field shielding member surrounded by passages of the outer two beams among the three electron beams, and shields these beams at one portion of the deflection magnetic field.

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

1 is a plan view in a longitudinal section of a color television display according to the present invention. The color television receiving tube 10 includes an exhausted glass encapsulation tube 11. The front face of this glass encapsulation tube 11 is a screen and a faceplate 12, and a plurality of red, green, and blue phosphor elements 13, 13a, and 13b are deposited on the inner upper side thereof. It is. In this tube, a mask 14 including a plurality of openings 15 is disposed adjacent to the phosphor element. These openings 15 are disposed in association with the phosphor element so that the electron beam can pass through so that only the phosphor element of the color corresponding to the beam collides therewith. At the other end of the glass encapsulation tube 11, an electron gun assembly 16 is provided for generating three electron beams on a common plane, that is, in-line. The electron gun assembly 16 is comprised so that the two types of electron beams of the outer side may be located in the center of a screen image, and it concentrates on the center beam. The electron gun 16 will be described later in detail with reference to FIG.

The deflection yoke 17 is disposed so as to surround the outside of the glass encapsulation tube 11 in the form of a morning glory. The deflection yoke 17 is excited by a source (not shown) of a suitable scanning current, and is configured to generate a magnetic field for deflecting the electron beam to form a raster scanned on the screen. have. The deflection yoke 17 will be described in detail later with reference to FIGS. 3 and 4.

A sic convergence assembly 18 is disposed behind the necked deflection yoke 17 of the glass encapsulation tube 11. The static convergence assembly 18 includes magnets, which compensate for the so-called error in the alignment of the beams and always concentrate on the center point of the screen when the beams are not deflected, The position can be adjusted.

A static convergence assembly for use with an arrayed gun gun assembly is described in Robert L. Barbin's Magnetic Beam Adjuster, US Patent Application No. 217,757, filed Jan. 14, 1972. Behind the beam converging assembly 18, there is provided a beam purifying device 19 of a conventional design in which the beams act to impinge corresponding phosphor elements, respectively.

As will be described later, following the description of the components of the device shown in FIG. 1, the deflection yoke 17 and the electron gun assembly 16 use additional devices to dynamically focus the beam or correct coma effects. Without doing so, the three electron beams cooperate to concentrate in a satisfactory state at all points on the scanning raster.

FIG. 2 is a diagram showing the predominant deflection magnetic field generated by the deflection yoke shown in FIG. The non-uniformity of the horizontal and vertical magnetic fields will vary from point to point along the longitudinal axis of the tube, but the practical effect is as shown in FIG. The deflection magnetic field for deflecting the beam generated by the pair of horizontal deflection coils in the horizontal direction is shown by the solid line of the magnetic flux 21 extending in the vertical direction. From the center of this figure, it should be noted that the magnetic flux lines are blocked, and this magnetic field is in the form of a pincushion. This horizontal deflection field produces isotropic astigmatism on the negative horizontal axis of the electron beam.

The magnetic flux line 22 shown in FIG. 2 represents a deflection magnetic field for deflecting the beam in the vertical direction, which is generated by a pair of vertical deflection coils of the deflection yoke 17. It should be noted that this vertically deflected magnetic field is usually barrel-shaped, and its magnetic flux lines are concave when viewed from the center of the drawing. This vertical deflection field produces an isotropic boiling point sequence on the beam's positive horizontal axis. The purpose of generating the above-described unique deflection magnetic field is explained with reference to FIG.

FIG. 3 shows a state in which the electron beam of the apparatus shown in FIG. 1 is concentrated under the influence of the deflection magnetic field shown in FIG. 3 shows the relative positions of each beam when green, red and blue beams 20a, 20b and 20c appear in the yoke's deflection plane (plane C in FIG. 1) as seen from the faceplate side of the water pipe. . FIG. 3B exaggerates the concentration of the beam at the corner of the nose of the scanning raster and at each of the vertical and horizontal deflection axes 25 and 26. It should be noted here that each electron beam simultaneously irradiates several phosphor elements of which a particular color is formed. Of course, these phosphor elements are isolated from each other, but are not shown in FIG. 3B showing the concentration of the entire beam in various regions on the face plate.

Green, red and blue beams are concentrated in the center of the master. This centralization is achieved by the alignment of the beam provided by the structure of the electron gun assembly and the action of the static convergence assembly 18 shown in Article 1. The beams of green, red and blue are not concentrated enough along the horizontal deflection axis 26, i.e., the beams are separated along the horizontal plane, and the arrangement order of these beams is shown as in the case of FIG. have. This state exists at both ends of the raster extending along the horizontal axis. On the tip of this horizontal axis, the insufficient convergence of the beam is made clear by the fact that the distance from the center of the raster to the point where the beam is concentrated is reduced as a function. Insufficient convergence of the horizontal beam is due to the specific horizontal deflection field shown in FIG.

At the distal end of the vertical axis 25 in FIG. 3B, the beams of red, green and blue are excessively concentrated. That is, the beams of blue and rust intersect at some point, and as a result, in the face plate containing the phosphor element, these beams of blue and rust are shifted to the opposite side of the positional relationship on the yoke deflection front face. The excessive concentration of the beam along this vertical axis is reduced as a function of the distance from the raster center point to the point where the beam is concentrated. The overconcentration of the beam along this vertical axis is due to the specific vertical deflection magnetic field shown in FIG. The convergence states of these beams are the result of the design of the deflection yoke such that the isotropic astigmatism on any negative horizontal axis and the isotropic astigmatism on any positive vertical axis appear. Although the beam has been described in terms of concentration over-focused along the vertical axis and under-focused along the horizontal axis, other states of misconvergence in contact with these axes can be used to make the concentrations permissible throughout the raster. Be aware that you can.

By harmonizing the astigmatism of the deflection coils, it has been found that the beams can be substantially concentrated not only at the four coowner booleans of the raster, but also at all other points of the raster shown in FIG. 3b. The coowner convergence displayed on the right top coowner of the master of FIG. 3b shows that the blue and green beams are slightly shifted in the vertical direction with respect to the enemy beams. The upper left coowner shows that the green and green beams are offset against the enemy's beams in the opposite direction as indicated by the right upper coowner. This effect on the master is known as trap, and under this condition the shape of the raster is not spherical but rather trapezoidal. Previously, the production of line-focused yokes with ideal focusing of beams along the deflection axis has been demonstrated, but unacceptably large traps are created at each co-owner of the raster. It was. Moreover, the state of the cornerer convergence was characterized by the horizontal separation of the beams as well as the relatively large vertical separation of the beams.

The ideal line focusing yoke has isotropic astigmatism on the negative horizontal axis and isotropic aberration on the positive vertical side. This type of astigmatism is necessary to maintain the convergence of the three horizontal heat beams along the horizontal and vertical deflection axes. This state of convergence on the side extends to every corner of Raster, and ideally to every point of Raster. In practice, this ideal line focus could be realized for the first time when experimenting with a water tube whose screen size was less than 14 mm (about 35.56 cm).

If the diagonal dimension of the screen is larger than this, the ideal line focusing state will not be realized, and a trapping state as described with reference to FIG. 3b will be generated. In particular, the present invention is directed to large water pipes having a screen dimension larger than 14 mm (about 35.56 cm). Thus, in such large pipes, if there is a trap, the winding distribution of the conductors is appropriately selected so that a true concentrated state is obtained at all points on the raster, provided that the positive and negative astigmatism between the vertical and horizontal deflection coils is not harmonized. Can not be done.

The term "substantial concentration" as mentioned here refers to a commercially acceptable concentration. It is common for manufacturers of television sets to set the limit tolerance of misconvergence in the design specification of any particular television set. It is always desirable to keep this misconvergence close to zero, but in practice it is almost impossible to make the misconvergence zero because of its manufacturing shape and variations. A given design goal for a manufacturer is that the beam's miss convergence measured at a distance of 1/2 부터 (approximately 1.27cm) from the edge of the scanned raster should be 15˝ (approximately 38cm) of the screen's diagonal. The correlation should be less than 50 mi1s (about 1.6mm). For larger screen sizes, this design limit would be increased, which would be about 62 mi1s (about 1.6 mm) for a water tube with a scratch-in of 25 ˝ (63.5 cm) diagonal.

In practice, the above-described manufacturing fluctuations, in particular, the first fluctuations of the color receiving tube and the yoke, result in a difference in misconvergence per receiver. The error in many receivers will be less than about 1.3 mm of the design target. On the other hand, the miss convergence of other receivers made with the same set of parts on the same production line will be greater. It is found that the error of disconvergence exceeds 125mi1s (about 3.18mm) among the receivers actually sold as a product. As used in this specification, the term substantial concentration means misconvergence not greater than 125 mi1s (about 3.18 mm). The beam's misconvergence can be observed as a separate state of ideally superimposed red, blue and green lines that form a crosshatch pattern line on the screen when the appropriate test signal in the television receiver is combined. Production variations in yokes and pipes combined with assemblies without optimal conditions can lead to large conver- gence errors, such as 0.125 3. (approximately 3.18 mm), but this is not a frequent occurrence. The present invention can be usefully utilized.

A deflection yoke for use in common with a passion electron gun, described in detail herein and also filed simultaneously with the present invention by W. William H. Barkow et al., US Patent Application No. 217,768 (filed Jan. 14, 1972). The deflection yoke, described in greater detail in Fig. 2, produces a deflection magnetic field that results in substantial concentration of the beam at all points of the raster by properly distributing the astigmatism between the horizontal and vertical deflection windings.

4 shows the winding distribution of a doughnut-shaped deflection yoke suitable for producing the convergence characteristics shown in FIG. 3b. The yoke is composed of a conductor 31 forming a pair of vertical deflection coils wound in a donut shape around a ferrite core 30 and a conductor 32 forming a pair of horizontal deflection coils. . It should be noted that the return conductors of the conductors 31 and 32 are located outside the ferrite core 30.

FIG. 5 shows an electron gun assembly 16 that can be suitably used in the apparatus shown in FIG. Three independent cathodes 35a, 35b and 35c are provided to generate three horseshoe beams. Electrons emitted by these cathodes are then accelerated by the remaining electrode group including the G1 electrode 36, the G2 electrode 37, the G3 electrode 38, and the G4 electrode 39, and are connected to form a beam. Although not shown, these cathodes and other electrodes are held in their relative positions by conventional suitable glass support beads installed on these electrodes.

The electron gun assembly 16 generates three electron beams focused on the faceplate center of FIG. 1 in the absence of a deflection magnetic field generated by the deflection yoke. The relative alignment of the respective electrodes, in particular G3 and G4, and their spacing are important for obtaining this concentrated state. Note that all electrodes have three openings and are common to three beams. This unique construction makes it very easy to construct a precision electron gun that produces a desirable match of the beam, especially in the vertical direction. The two beams on the outside can be concentrated on the center beam of the screen by the gap between the openings of G3 and G4. Minor errors in beam matching (which is a convergence at the center of the screen) are corrected by appropriately adjusting the static convergence described above.

In larger color water tubes, for example, a color water tube whose diagonal dimension of the screen is greater than 15˝ (approximately 38 cm), the size of the raster injected by the outer 2 beams is injected by the screen beam's center beam. Each time it is desirable to perform coma correction to be the same. Coma can also be caused by deflection yokes, the greater the size of the screenin, the more offended the viewer. In order to correct the effect of this coma, magnetic field control means made of permeable materials such as Nickel-Iron and generally annular shields 40 and 41 are arranged around the opening of the G4 electrode. In fact, these shielding windows protect the external 2 beams from the deflection field and equalize the effects of the 3 nonclinical deflection field to generate three equally sized rasters. Preferred electron gun assemblies of the same type as described above are described in detail in "Constant Electron Gun", US Patent Application No. 217,758 (filed Jan. 14, 1972) by Richard Hughes.

The spacing between adjacent beams in the automatic centralized color television display according to the present invention must be carefully selected. The minimum spacing between adjacent beams is determined by the minimum allowable light output requirement of the receiving pipe. As the mutual gap between beams is made smaller, the transmittance of the mask must be lowered in order to maintain color purity, so that the light output from the receiving tube is further reduced. The lower limit between adjacent beams for obtaining satisfactory brightness in a given water pipe can be calculated or determined by methods well known in the art.

On the other hand, according to the present invention, there is an upper limit to the interval between adjacent beams. As far as this limit is concerned, the deflection yoke approaches this upper limit when the beam does not give satisfactory concentration at all points on the raster.

Referring back to FIG. 1, it can be seen that the spacing between adjacent recesses in the plane passing through point C is represented by the distance S between the centers of the adjacent beams. This C represents the deflection plane of the yoke. Although S was measured in the deflection plane spaced apart from the gun assembly, it was recognized that this S was determined by selecting an electron gun which produced the desired spacing when measuring in the plane, which is intermediate to the length of the yoke. Should be. Moreover, on the deflection plane containing C point, each beam is isolate | separated completely without contacting each other. The relationship of S to the aperture spacing of the beam forming electrode of this electron gun is determined trigonometrically by first measuring the distance between the aperture and the center of the yoke along the passageway where the beam is concentrated towards the screen and the spacing between these apertures. . Deflection plane C is generally in a plane perpendicular to this axis at a position intermediate to the longitudinal axis of the yoke. The deflection yoke surrounds the outer side of the glass encapsulation tube of the water pipe and is mounted so as to form a relatively small gap between the inner surface of the yoke and the oil encapsulation. Typically, this gap is less than 1 / 4˝ (6.35mm). In order to achieve the best possible concentration of the beam, it has been found that in the case of the yoke of the above-described form, it may be moved in a direction extending perpendicular to the longitudinal axis of the water pipe. The static convergence assembly first adjusts the beam to focus on the center of the raster. The yoke is then moved in the direction across the water pipe until the overall concentration on the raster is optimal. The yoke is then fixed in the desired position by suitable mounting means.

In the above screen, a deflection oak having a conduction distribution of deflection windings selected to generate isotropic astigmatism on a negative horizontal axis and isotropic astigmatism on a positive vertical axis has a spacing not exceeding 0.200 ˝ (5.1 mm). It is possible to keep the concentration of one of the three electron beams indistinguishable. The color television display device according to the present invention has been successfully constructed by using a water tube having a screen length of 15 kV and 17 kV (about 38.1 cm and 43.2 cm) and an interval of 0.158 kV (about 4.1 mm). This combination cooperates with the slit-type aperture mask to bring about the appropriate light output of the water tube. It was determined that the effect of coma, ie, rasters of different colors of equal size, increased in proportion to the power of distance S. This is one reason why S should not be increased to a relatively large value for the purpose of simply increasing the light output of the water pipe. If the distance 5 is not greater than 0.200 m (approximately 5.1 mm) and the screen's diagonal dimension does not exceed 14 m (approximately 35.6 cm), then the coma effect needs to be corrected. When a water tube with a larger screen is used, the effect of the coma is increased proportionally, and it is preferable to use the coma shielding device described with reference to FIG. Although the doughnut-shaped yoke has been described in the above embodiment, it should be appreciated that a suitable deflection yoke using a saddle-shaped coil can be used in the same shape. It is well known that the coma characteristics of the saddle coil may be controlled by selecting the distribution of the saddle coil at the inlet and center of the deflection coil. Similarly, the astigmatism of the saddle coil can be controlled by the winding distribution of the central part and the outlet part of the deflection coil. Since the coma characteristics of the saddle-shaped yoke are controllable, in some cases the coma shield described with reference to FIG. 5 may be omitted.

In some embodiments of the present invention, the light output of a kinescope using a screen including a phosphor mask and a shadow mask in which a dot-shaped opening is formed becomes less than an allowable level. It is sometimes desirable to reduce the misconvergence of a beam or to reduce the coma effect by reducing the spacing S of adjacent beams. In such a case, the light output can be increased by using the phosphor element and the opening mask configuration as shown in FIG.

6 shows an aperture mask and a line-shaped phosphor element screen that are suitable for use in the image tube of FIG. In FIG. 6, three types of electron beams 20a, 20b, and 20c are lines deposited on screen 12 through elongated opening slits 15 in opening mask 14. The green, red and blue phosphor elements of the mold are directed to collide with each other. This Hungarian structure, in which the slit-shaped opening is on the same straight line as the line of the vertical phosphor element, is not critical because the vertical alignment of the beam is critical, so that together with the horizontally aligned electron gun described in FIG. It is advantageous to use. This is because the phosphor element continuously extends in the vertical direction of the screen phase, and the beam always collides with the phosphor element of each required color in the vertical direction, so there is no need to critically control the vertical tolerance of the beam. Therefore, the thin and empty slits-shaped openings 15 in the opening mask 14 pass more beams than the dot-type openings used for screening with the dot phosphor elements. In devices comprising the elongated slits of the FIG. 6 and the vertical phosphor elements, the high mask transmittance increases the light output of the water tube and allows the relatively small S spacing of the resulting beams. This is because substantial concentration of the caster beam injected by the deflection yoke can be achieved. Unlike the delta gun gun assembly, the beam gun assembly used in the device according to the invention does not require dynamic convergence, so when the beam is deflected at the center of the raster, the beam trio It does not result in the variance of the, i.e. the expanding of the spacing of the beam trio. Therefore, the lens system for applying these phosphor elements can be made simple.

The above-described apparatus has an advantageous feature that it is not necessary to dynamically correct the effects of misconvergence and coma. The effect of miskenburance and coma is increased as the size of the screen is increased, but in the present invention, the alignment electron beam color has a screen of diagonal sizes of 23 mm and 25 mm (about 58.4 cm and 63.5 cm). It is particularly useful when used for a water pipe. However, in the case described above, the features of the automatic convergence of the present invention can be supplemented by a simple dynamic convergence device. When this is done, it is possible to use a mental or electronic converging means which is arranged in the neck portion of the receiving tube and excited only at one of the line scanning rate and the field scanning rate. For example, as described above, only the horizontal dynamic convergence correction device together with the horizontal alignment electron gun assembly can be used to satisfactorily focus the beam at all points in the raster.

Claims (1)

The evacuated glass encapsulation tube, three different colors extending in the vertical direction, are screens made of a piece plate having a repeating pattern of phosphor elements, and are provided inside the piece plate in the glass encapsulation tube. An apertured disk with a plurality of slots extending in a vertical direction to align with the phosphor element, and an electron gun assembly generating three horizontally lined electron beams in a plane substantially perpendicular to the screen; Control the strength of at least one common beam forming electrode having three openings for directing the beam toward the faceplate of the opening mask, and a deflection magnetic field acting on two types of outer ones of the three types of beams; With an electron gun assembly with arranged means, the diagonal length of the screen is 35.56 cm (14 ˝) A large color television receiver, positioned between the mist and electron gun assembly in the periphery of the receiver, depicting the raster on the screen by deflecting the three beams in the horizontal and vertical directions. In order to achieve this, a horizontal deflection coil having negative isotropic astigmatism in the horizontal axis direction and a vertical deflection coil having positive isotropic astigmatism in the vertical axis direction, the coils are each around the raster depicted on the screen. 1.27 cm (inward

And a deflection yoke for generating a deflection magnetic field in which the size of the missconvergence of the beam on the vertical and horizontal axes at the position is less than 3.18 mm (0.125 ˝) (not including 0). In the common beam forming electrode of the electron gun assembly, when the three types of beams are not deflected, the respective beams are safely separated from each other on the deflection surface passing through the center portion in the longitudinal direction of the deflection yoke, and the electrons are almost adjacent to each other. Automatically concentrated color television display selected so that the distance between beam centers does not exceed 5.08 mm (0.200 kPa).

Images