KR100439637B1 - Deflection yoke apparatus - Google Patents

Abstract

The present invention provides a deflection yoke capable of correcting deflection distortion, in particular screen transverse distortion, which appears in a deflection yoke device constituted by a combination of a rectangular horizontal deflection coil and a vertical deflection coil wound directly on a circular ferrite core. It is an object to provide a device.

In a deflection yoke device in which a horizontal deflection coil 22 and a vertical deflection coil 23 are arranged in a coil mounting frame 21 extending from a small diameter portion to a large diameter portion, upper and lower ends of the large diameter portion of the coil mounting frame 21. It has a pair of upper and lower magnets 27a and 27b having magnetic poles in the X-direction arranged in each other, and three are arranged at the left and right ends of the large-diameter portion of the coil mounting frame 21, respectively, and are arranged at the left and right sides of the CRT screen. Six left and right magnets 28a, 28b and 29a to 29d having magnetic poles in the Y direction to correct lateral distortion near the stage, and the two magnets 28a and 28b on the X-axis press-in the electron beam to the inside of the screen in the horizontal direction. 6 magnets (29a to 29d) arranged in the vertical direction, four magnets (29a to 29d) in the middle of the vertical direction, the left and right 6 having magnetic poles in the Y direction arranged in the direction of pulling the electron beam to the outside of the horizontal screen Of magnets .

Description

Deflection Yoke Device {DEFLECTION YOKE APPARATUS}

The present invention relates to a deflection yoke device effective for correcting deflection distortion (particularly, horizontal distortion) appearing on a screen of a cathode ray tube.

Currently, cathode ray tubes (hereinafter referred to as CRTs) and liquid crystal panels (liquid crystal display pannels) are mainly used as display devices such as television receivers. In the display device employing the CRT, a deflection yoke device is used to deflect the electron beam of the CRT.

Various improvements have also been made in this deflection yoke device, and in recent years, development of a deflection yoke device with high precision and easy assembly has been performed.

In a conventional semi-toroidal type deflection yoke device, a pair of segmented toroidal cores, which are mounted at positions shifting from the neck portion of the CRT to the cone portion, are divided into two pairs. Each coil was wound in a toroidal shape to form a pair of vertical deflection coils, and the horizontal deflection coil was divided into two and each coil was wound into a saddle to form a pair of horizontal deflection coils. These horizontal deflection coils and vertical deflection coils are mounted on the inner and outer sides of a coil mounting frame called a coil separator composed of two divided synthetic resins, and the two deflection coils are separated by a coil separator, and also positioned. there was.

Specifically, each bend is provided with a pair of horizontal deflection coils disposed inside the coil separator having a shape extending from the neck side to the front side, and provided on the neck side and the front side of the horizontal deflection coil, respectively. The portion is stored in each band housing portion of the coil separator to hold and position the horizontal deflection coil. On the other hand, in the vertical deflection coil, a pair of vertical deflection coils wound around the core in a toroidal shape was disposed outside the coil separator to position the deflection yoke device. Moreover, the product which comprised the vertical deflection coil in the saddle type of the bandless type, was attached to the outer surface of the coil separator, and the product which attached the core to the outer periphery of this vertical deflection coil is also developed.

In this case, the cone shape of the CRT to which the deflection yoke is mounted is circular, so that the saddle-shaped horizontal deflection coil mounted to the deflection yoke is also circular.

In addition, the coil separator composed of an insulator also has a circular shape that gradually expands from the small diameter portion on the neck side to the large diameter portion on the front side, and a pair of horizontal deflection coils is built in the inner side of the coil separator, A pair of vertical deflection coils wound directly on the ferrite core is arranged in an array.

On the other hand, in recent years, the cone shape of the CRT has been commercialized. The main purpose of the square of the CRT cone is to make the deflection yoke a square to increase the deflection sensitivity to an energy-saving type. For this reason, the coil separator has a square shape gradually expanding from the small diameter portion on the neck side to the large diameter portion on the front side, and the horizontal deflection coils and the vertical deflection coils mounted on the inner and outer sides of the coil separator are also rectangular saddle coils. (In the case of a square, the vertical deflection coil is also a saddle because it is difficult to perform a toroidal winding.) In addition, a rectangular ferrite core is arranged outside the saddle-shaped vertical deflection coil.

The cone-shaped CRT of the CRT is a rectangular and saddle-shaped vertical deflection coil, which has more freedom in forming a magnetic field than a vertical deflection coil wound in a circular ferrite core with a toroidal shape, and has a relatively complicated effect on the electron beam. It is possible.

In addition, comb coils are arranged in the neck-side small diameter portion of the coil separator of the deflection yoke for correcting beam position deviations such as deflection aberration, and a plurality of comb coils are disposed in the large diameter portion at upper and lower positions corresponding to the upper and lower sides of the screen. Magnets are arranged in order to correct deflection distortion.

As a prior art example of the deflection yoke apparatus provided with such a deflection distortion correction means, there exist some described in Unexamined-Japanese-Patent No. 7-40473. This publication describes an inline type color deflection yoke device with correction means for pincushion distortion appearing above and below the screen of a cathode ray tube, and the funnel side of the deflection yoke. The first correction magnet is installed at the upper and lower positions of the first and second correction magnets are installed at the diagonal upper and lower positions oriented to the center Y axis rather than the diagonal axis, and the center portion of the upper and lower pincushion distortions is linearly corrected by the magnetic field of the first correction magnet. The upper and lower peripheral edges of the pincushion distortion are linearly corrected by the magnetic field of the second correcting magnet, and the upper and lower pincushion distortions are corrected by almost perfect linear distortion by the magnetic fields of the first and second correcting magnets. Described. However, this publication uses a rectangular coil separator as described above to arrange a rectangular horizontal deflection coil inside the coil separator, and to arrange a vertical deflection coil wound directly on a circular ferrite core outside the coil separator. The method of effectively correcting the deflection distortion appearing in the deflection yoke device in this case is not described at all.

In particular, a rectangular coil deflector is arranged inside the coil separator with respect to the rectangular coil separator, while a vertical deflection coil wound directly on the circular ferrite core is arranged outside the coil separator (vertical with respect to the rectangular coil separator). The reason for arranging the circular toroidal type vertical deflection coils without making the deflection coils square is to reduce the cost.] In order to correct the deflection distortion caused by the deflection yoke device in the case of the configuration, Since a vertical deflection coil is used, there is a problem that there is no freedom in forming the magnetic field, the action on the electron beam is simple, and various deflection distortion correction cannot be coped with.

As described above, the conventional technique does not provide a means for correcting all types of deflection distortion which cannot be corrected by the coil group, but in particular, a square horizontal deflection coil using a square coil separator. There is no description of a method for correcting the deflection distortion exhibited by a deflection yoke device constituted by a combination with a vertical deflection coil wound directly on a round ferrite core.

Thus, the present invention has been made to solve the above problems, and the deflection distortion, in particular the screen transverse distortion, which is caused by a deflection yoke device constituted by a combination of a rectangular horizontal deflection coil and a vertical deflection coil wound directly on a circular ferrite core, etc. An object of the present invention is to provide a deflection yoke device capable of correcting hereinafter (hereinafter referred to as horizontal distortion).

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the deflection yoke apparatus of one Embodiment of this invention.

FIG. 2 is a perspective view of a saddle-type horizontal deflection coil used in the deflection yoke device of FIG. 1. FIG.

3 is an X-Y cross-sectional view near the large diameter portion of the deflection yoke device of FIG. 1;

4 is a diagram illustrating lateral distortion of a CRT screen.

FIG. 5 is a magnet arrangement diagram used for the deflection yoke device of FIG. 1; FIG.

6 is a view for explaining the action by the magnet arrangement of FIG.

<Explanation of symbols for main parts of drawing>

21: coil separator (coil mounting frame)

22: horizontal deflection coil

23: core

24a, 24b: vertical deflection coil

27a, 27b, 28a, 28b, 29a to 29d: magnet

Deflection yoke device according to the present invention,

A coil mounting frame attached to the neck portion outer periphery of the CRT, the coil mounting frame having a shape extending from the small diameter portion toward the large diameter portion;

A horizontal deflection coil and a vertical deflection coil held in the coil mounting frame;

A pair of magnets provided at upper and lower ends of the large diameter portion of the coil mounting frame, each having a magnetic pole in the X-axis direction;

In order to correct lateral distortion in the vicinity of the left and right ends at the upper and lower sides of the screen of the CRT, three magnets are provided at each of the left and right ends of the large diameter portion of the coil mounting frame, and are provided with six magnets having magnetic poles in the Y-axis direction.

Of the three magnets respectively provided at the left end and the right end of the large diameter portion, the magnet located in the center acts to press the electron beam inward in the X-axis direction of the screen, and the magnets located at both sides of the center magnet receive the electron beam. It is arrange | positioned so that it may act in the direction which pulls outward of the screen X-axis direction.

According to the present invention, the lateral distortions in the vicinity of the left and right end sides on the upper and lower sides of the screen can be arbitrarily and easily corrected by six magnets arranged three at the left and right end ends of the large diameter portion of the coil mounting frame.

The six magnets allow these mounting positions in the vertical direction to be selected according to the tendency and distortion position of the lateral distortion of the CRT screen.

According to this, it is possible to correct by changing the position of the magnet depending on which part of the screen the horizontal distortion is desired to correct.

The six magnets allow their size (at least one of length and thickness) to be selected according to the tendency and distortion of the lateral distortion of the CRT screen.

In addition, the six magnets allow the strength of these magnetic fields to be selected according to the tendency and distortion of the lateral distortion of the CRT screen.

In addition, the cone shape of the CRT is a rectangular shape, the horizontal deflection coil has a rectangular saddle shape, the vertical deflection coil has a toroidal type wound directly on a circular ferrite core.

This corrects the lateral distortion caused by the costly advantageous configuration of the deflection yoke device when using a rectangular coil mounting frame, a saddle-shaped horizontal deflection coil and a toroidal vertical deflection coil wound directly on a circular ferrite core. Valid.

The CRT is characterized in that the planar CRT. Since lateral distortion is liable to occur in planar CRT, the present invention is particularly useful for correcting this lateral distortion.

In addition, the deflection yoke device according to the present invention,

A coil mounting frame mounted on the outer periphery of the neck portion of the CRT having a rectangular cone shape, and having a shape extending from the small diameter portion toward the large diameter portion,

A horizontal deflection coil and a vertical deflection coil held in the coil mounting frame;

A pair of magnets each provided at upper and lower ends of a large diameter portion of the coil mounting frame and having magnetic poles in an X-axis direction;

In order to correct lateral distortion in the vicinity of the left and right ends at the upper and lower sides of the screen of the CRT, three magnets are provided at each of the left and right ends of the large diameter portion of the coil mounting frame, and are provided with six magnets having magnetic poles in the Y-axis direction.

Of the three magnets provided at the left end of the large diameter portion, the magnetic pole directions of the first magnet located in the center and the magnetic pole directions of the second and third magnets located on both sides of the first magnet are opposite,

Among the three magnets provided at the right end of the large diameter portion, the fourth magnet located at the center has the opposite direction of the first magnet and the magnetic pole, and the fifth and sixth magnets located at both sides of the fourth magnet The magnetic pole direction is opposite to the fourth magnet,

The first and fourth magnets act to press the electron beam inwards in the screen X-axis direction, and the second, third, and fifth and sixth magnets extend in the direction in which the electron beams are pulled outward in the screen X-axis direction. It is characterized in that the function.

Embodiments of the invention will be described with reference to the drawings.

1 is a perspective view illustrating a deflection yoke device of an embodiment of the present invention. In the case of the present embodiment, the cone shape of the CRT to which the deflection yoke device is mounted is square, and therefore the saddle-shaped horizontal deflection coil mounted to the deflection yoke device is also square as shown in FIG.

The coil separator 21 composed of an insulator has a rectangular shape gradually extending from the small diameter portion on the neck side to the large diameter portion on the front side, and has a pair of horizontal deflection coils 22 inside the coil separator 21. 2 shows only one half of the coil 22a in the pair of coils 22a and 22b], and a pair of toroidal type vertical deflections wound directly on the circular ferrite core 23 on the outside. The coils 24 (24a, 24b) are arranged in an array.

In order to increase the deflection sensitivity, the horizontal deflection coil 22 has an overhead connection wire 221, 222 in a form (commonly referred to as a bandless shape) along the pole force CRT shape, as shown in FIG. Reference numeral 223 denotes a window portion in which no electric wire is wound. Further, coma coils 25 (25a, 25b) for correcting beam position variations such as deflection aberration are arranged in the small-diameter box portion 21a of the coil separator 21, and these coils 22, 24, The terminal plate 26 for connecting 25 is arranged in the coil separator 21. In addition, the large-diameter box portion 21b of the coil separator 21 has a substantially rectangular shape, and magnets 27a and 27b are disposed on the Y axis on the upper and lower portions thereof, and magnets 28a and 28b are placed on the X axis on the left and right portions thereof. ) Are arranged in a row, and magnets 29a, 29b, 29c, and 29d are arranged at positions (upper and middle portions) spaced apart from a predetermined distance with respect to the magnets 28a and 28b on these X axes. That is, the magnet 29a is provided in the upper middle part of the magnet 28a on the X-axis of the right part of the large diameter box part 21b, and the magnet 29b is arranged in the lower middle part, and the large diameter box part is arranged. The magnet 29d is arranged in the upper middle part of the magnet 28b on the X-axis of the left part of 21b, and the magnet 29c is arrange | positioned in the lower middle part.

3 is an X-Y cross-sectional view of the large diameter portion side of the deflection yoke device of FIG. 1. In this cross section, center ribs 21c and 21c protruding from the inner side of the coil separator 21 on the inner side of the square coil separator 21 are opposed to each other, and the half of the horizontal deflection coil 22 as shown in FIG. The coils 22a and 22b of the sieve are arranged above and below the Y-axis direction, respectively. Outside the coil separator 21 having a rectangular cross section, the half-vertical vertical deflection coils 24a and 24b constituting the vertical deflection coil 24 wound around the circular ferrite core 23 are placed on the upper and lower sides in the Y-axis direction. Each array is installed. Since the shape of the inner coil separator 21 is rectangular and the shape of the outer vertical deflection coil 24 is circular, the space between the coil separator 21 and the vertical deflection coil 24 [space: 30 ( space)] exists.

Looking at the relationship between the horizontal deflection coils 22a and 22b and the ferrite core 23, in their diagonal portions (shown as XY in FIG. 3), the horizontal deflection coil is closest to the ferrite core 23 and is horizontal on the Y axis. The deflection coils are spaced farthest from the ferrite core 23, and are spaced apart from each other by an intermediate distance between the XY portion and the Y axis on the X axis. This distance relationship is such that the tendency of the deflection yoke gradually increases from the middle portion of the tubular direction to the large diameter portion. As a result, the magnetic field distribution on the large diameter side becomes a pin cushion magnetic field. As shown in Fig. 4, the horizontal lines b and c of the middle part of the screen in the up and down directions become limp (shown by the symbol E) near the left and right ends of the screen as shown by the solid line (dotted lines are Ideal row without sagging).

FIG. 5 shows the arrangement of the magnets and the magnetic force lines of the respective magnets provided on the large diameter side of the deflection yoke device of FIG. 1. FIG. 6 shows the forces (forces in the horizontal directions H to M and forces in the vertical directions p to w) acting on the electron beam in accordance with the magnetic pole arrangement of the magnet in FIG. 5. The center of the X-axis and the Y-axis is taken as the center of the large-diameter box portion 21b on which the magnet is arranged.

In FIGS. 5 and 6, the four magnets 29a to 29d are provided at the middle portion in the vertical direction of the left and right ends of the large diameter portion of the coil separator, and among the four magnets 29a to 29d, the magnets at the right end of the large diameter portion. The direction SN of the magnetic poles 29a and 29b is arranged so as to be opposite to the magnetic pole direction NS of the magnet 28a on the X axis, and the magnetic poles of the magnets 29d and 29c at the left end of the large diameter portion are arranged. The direction NS is characterized by being arranged so as to be opposite to the magnetic pole direction SN of the magnet 28b on the X axis.

At the upper and lower ends of the large diameter box portion 21b of the coil separator 21, a pair of upper and lower magnets 27a and 27b having magnetic poles NS and SN in the X direction are arranged. The magnets 27a and 27b arranged at the upper and lower ends of the large-diameter box portion 21b are particularly set in a dimensional shape that eliminates horizontal line distortion near the screen Y axis.

In addition, three magnets 28a and 28b and magnets 29a to 29d are arranged at the left and right ends of the large diameter box portion 21b of the coil separator 21, respectively, and the horizontal lines of the left and right ends at the top and bottom of the CRT screen are arranged. Six magnets left and right with magnetic poles in the Y direction to correct the distortion. Of the six left and right magnets, two magnets 28a and 28b each arranged on the X axis of the left and right ends of the large-diameter box portion 21b each press the electron beam to the inside of the horizontal screen (Fig. 6). A magnet having magnetic poles (SN, NS) in the Y direction, arranged in the direction indicated by the symbols H and I, in the upper and lower directions of the left and right ends of the large-diameter box portion 21b (the X-axis as the boundary). Four magnets 29a to 29d arranged in the left and right sides arranged in the lower middle part are arranged in directions (shown by symbols J, K, L, and M of FIG. 6) which stretch the electron beam to the outside of the screen in the horizontal direction. It is a magnet having magnetic poles (NS, SN) in the Y direction provided.

As will be described later, in the vicinity of the boundary between the magnets 28a and 28b on the X-axis and the magnets 29a to 29d in the vertical middle portion, both adjacent magnets [28a and 29a, 28a and 29b, 28b and 29d]. ), (28b and 29c)], in which the magnetic field in the left and right directions (shown by symbols g1 to g4 in FIG. 6) having magnetic lines in the same direction acts to shake the electron beam out of the screen in the vertical direction (symbols r and s in FIG. 6). (shown as t, u), the distortion of the screen horizontal line by matching the position where the strongest magnetic fields g1 to g4 are the strongest with the position where the screen sag (shown by symbol E in FIG. 4) is the largest. It is possible to modify it.

As for the lateral distortion, the force in the direction in which the electron beam is shaken to the outside of the screen in the vertical direction on the X axis side with the center of the magnets of the magnets 29a to 29d as shown in the drawing (represented by symbols r, s, t, and u in Fig. 6). ) And a force (shown by reference signs p, q, v and w in FIG. 6) in the direction of shaking the electron beam inside the screen, so that the tendency of the horizontal line distortion of the upper and lower ends of the screen and the middle part of the vertical direction It is necessary to select the size dimension (length or thickness, etc.) and the mounting position of the magnets 29a to 29d according to the degree of distortion. In addition, the magnets 28a and 28b on the X-axis are related to the horizontal line distortion of the middle part in the vertical direction, and have a function of shaking the electron beam to the outside of the screen. I like it better.

In Fig. 4, the horizontal lines a and b at the upper and lower ends of the screen are shown as straight lines (no distortion), but the sizes of the magnets 29a to 29d are not so influenced at this time in the upper and lower horizontal lines a and b. You need to select the location. Experimentally, for example, in the 28-inch wide TV color CRT deflection yoke device, when the length of each of the magnets 29a to 29d is 13 mm, the mounting position is about 22 ° from the X axis (Fig. 5). ), The horizontal line distortion E of the middle point in the vertical direction can be eliminated without affecting the upper and lower end horizontal lines a and b.

In addition, in the above-described embodiment, the deflection yoke device which can correct the lateral distortion exhibited by the deflection yoke device constituted by the combination of the rectangular horizontal deflection coil and the vertical deflection coil wound directly on the circular ferrite core has been described. The present invention is not limited to this, but the deflection yoke device constituted by a combination of a circular horizontal deflection coil and a vertical deflection coil wound directly on a circular ferrite core, or a combination of a rectangular horizontal deflection coil and a rectangular vertical deflection coil, is used. Also in the deflection yoke device comprised by this, it is possible to correct lateral distortion by magnet arrangement in the large diameter part of the coil mounting frame which concerns on this invention. In addition, the present invention is the coil winding type of the horizontal vertical all saddle type (saddle type), the horizontal saddle type and vertical toroidal type (semi toroidal type), both horizontal and vertical vertical toroidal type [full toroidal (full- toroidal)] can be applied to any type of deflection yoke device.

As described above, according to the present invention, it is possible to easily correct deflection distortion, particularly lateral distortion, which occurs on the CRT screen by the magnet arrangement in the large diameter portion of the coil mounting frame. In the deflection yoke apparatus, for example, even when a toroidal type deflection coil having no degree of freedom is formed in forming a magnetic field, the lateral distortion can be corrected by the magnet arrangement according to the present invention.

Claims (7)

A deflection yoke device mounted on the outer periphery of a CRT and generating a magnetic field for deflecting the trajectory of an electron beam, The front face is mounted on the outer periphery of the rectangular CRT, has a shape that extends from the neck side of the CRT toward the front side, and the coil mounting frame forming the square frame at the front side, A horizontal deflection coil and a vertical deflection coil held on inner and outer circumferences of the coil mounting frame; It is provided along each of the left and right frame sides of the rectangular frame of the front side of the coil mounting frame, and provided with a magnet having a magnetic pole in the vertical direction of the front surface of the CRT, The three magnets provided on the left frame side of the front-side rectangular frame have an inverse relationship with the magnetic pole directions of the first and second magnets located in the center of the first and second magnets located on both sides of the first magnet. Three magnets provided on the right side of the frame on the front side of the rectangular frame have a magnetic pole direction of a fourth magnet located at the center thereof in inverse relationship with a magnetic pole direction of the first magnet, and fifth magnets positioned at both sides of the fourth magnet. The magnetic pole direction of the sixth magnet is inversely related to the magnetic pole direction of the fourth magnet, The first and fourth magnets act to press the electron beam inward in the screen X-axis direction, and the second, third, and fifth and sixth magnets pull the electron beam outward in the screen X-axis direction. Deflection yoke device, characterized in that to act in the direction. 2. The fifth and third magnets according to claim 1, wherein the second, first, and third magnets provided on the left frame side of the front side rectangular frame are arranged in a straight line and provided on the right frame side of the front side rectangular frame. The deflection yoke device, wherein the fourth and sixth magnets are similarly arranged in a straight line. The deflection yoke device according to claim 2, wherein the second, first, and third magnets are arranged at a predetermined interval, and likewise the fifth, fourth, and sixth magnets are arranged at a predetermined interval. The second and third magnets arranged on the left frame side of the front side rectangular frame are arranged on a straight line in parallel with the first magnet, and provided on the right frame side of the front side rectangular frame. The deflection yoke device, wherein the fifth and sixth magnets are similarly arranged in a straight line in parallel with the fourth magnets. The deflection yoke device according to claim 4, wherein the second, first, and third magnets are arranged at a predetermined interval, and likewise the fifth, fourth, and sixth magnets are arranged at a predetermined interval. delete delete