JPH11345579A - Cathode-ray tube device and deflecting yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce deflection power without degrading convergence quality in a cathode-ray tube device having a pyramid-shaped funnel yoke part and a generally circular neck part. SOLUTION: A cathode-ray tube device in which the yoke part 12 of a funnel is almost pyramid-shaped is so designed that at least the extension wire part 22b of a deflecting yoke 16 located at the neck of a horizontal deflecting coil 1 is formed in a bendless shape such that it is wound in such a way that it is not wound and stacked in a direction almost away from an electron beam (e) as the number of turn increases but is wound and stacked roughly in the direction of tube axis along the outer surface of a neck part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube apparatus such as a color picture tube, and more particularly to a cathode ray tube apparatus capable of effectively reducing deflection power.

[0002]

2. Description of the Related Art A color picture tube will be described as an example of a cathode ray tube. The color picture tube has a panel having a phosphor screen formed on an inner surface thereof, a funnel-shaped funnel connected to the panel, and a vacuum envelope including a cylindrical neck connected to the funnel. A deflection yoke is mounted from the neck to the funnel, and the funnel has a small-diameter portion from a connection with the neck to a portion where the deflection yoke is mounted, a so-called yoke.

[0003] The phosphor screen formed on the inner surface of the panel includes a plurality of phosphor layers that emit red, green, and blue light, respectively. An electron gun that emits a plurality of electron beams corresponding to emission colors is disposed in the neck. Further, a shadow mask having a color selection function fixed to the frame is provided inside the panel between the electron gun and the phosphor screen, and the electron beam emitted from the electron gun is shaped to form a phosphor layer of a specific color. Project the beamsbot.

In such a color picture tube, an electron gun is of an in-line type which emits three electron beams arranged in a line in the same horizontal plane, and the three electron beams arranged in a line are emitted from the electron gun in horizontal and vertical directions. The deflection yoke for deflecting and scanning the horizontal deflection magnetic field has a substantially pincushion shape and the vertical deflection magnetic field has a substantially barrel shape, thereby concentrating three electron beams arranged in a line over the entire screen without requiring special correction means. Self-convergence in-line type color cathode ray tubes are widely used.

[0005] In such a color picture tube, the deflection yoke is a large power consumption source.
Also in the cathode ray tube, it is important to reduce the power consumption, that is, the power consumption of the deflection yoke. On the other hand, an attempt to improve the performance of the cathode ray tube causes an increase in deflection power. For example, to increase the screen brightness,
Finally, the anode voltage for accelerating the electron beam must be increased. Further, in order to cope with higher resolution, the deflection frequency must be increased, and the deflection power tends to increase in any case. To reduce the deflection power, the diameter of the neck of the cathode ray tube is reduced, the outer diameter of the yoke where the deflection yoke is mounted is reduced, the working space of the deflection magnetic field is reduced, and the deflection magnetic field with respect to the electron beam is reduced. A method that works efficiently is effective.

However, in the conventional cathode ray tube, since the electron beam passes close to the inner surface of the yoke on which the deflection yoke is mounted, if the neck diameter and the outer diameter of the yoke are further reduced, as shown in FIG. At the same time, the electron beam e from the electron gun 102 toward the diagonal part of the phosphor screen 101 having the maximum deflection angle collides with the inner wall of the yoke part 103, and FIG.
As shown in FIG. 0B, a portion 104 (neck shadow) where the electron beam does not collide is formed on the phosphor screen 101.

Therefore, in the conventional cathode ray tube, the neck 107
It was difficult to reduce the deflection power by reducing the diameter or the outer diameter of the yoke portion 103. As a means for solving this problem, Japanese Patent Publication No. 48-34349 discloses that when a rectangular raster is drawn on a phosphor screen, the electron beam passage area inside the yoke portion on which the deflection yoke is mounted is also substantially rectangular. As shown in FIG. 11,
Yoke part 1 of funnel 106 to which deflection yoke is mounted
03 is the screen 1 of the panel 108 from the neck 107 side
A shape that gradually changes from a circular shape to a substantially rectangular shape in the 01 direction (line FF to line BB) is shown. When the yoke portion 103 on which the deflection yoke is mounted is formed in a pyramid shape, the diameters of the deflection yoke in the major axis and the minor axis directions can be reduced. Good deflection is achieved, and deflection power can be reduced.

However, if the yoke portion is formed in a pyramid shape having an accurate rectangular cross section, distortion occurs near the horizontal axis and near the vertical axis of the flat yoke portion due to the atmospheric pressure load, so that the atmospheric pressure strength of the vacuum envelope is reduced. And safety is impaired. Currently, there is a demand for external light reflection and image legibility, and flat panel surfaces are essential.However, flattening the cathode ray tube panel surface reduces the strength of the envelope. Using a funnel with a yoke portion in the shape of a pyramid, a new technology is required to secure the strength of the envelope necessary for safety. To solve these, the applicant
In Japanese Patent Application No. 9-220345, the relationship between the shape of the yoke and the strength of the envelope is defined for a cathode ray tube whose panel outer surface shape has a flatness that is at least twice the screen diagonal effective dimension. Regarding the core shape of the deflection yoke to be used, the shape of one cross section perpendicular to the tube axis was made non-circular, and the optimum shape was clarified in Japanese Patent Application No. 10-65737 (filed on March 16, 1998).

[0009]

FIG. 8A shows a structure in which a conical deflection yoke 105 is mounted on a yoke 103 of a conventional funnel, and FIG. 8B shows a horizontal deflection formed by this deflection yoke. 4 shows a magnetic field distribution MF1. Let c be the center of gravity of the conventional deflection magnetic field distribution MF1. As shown in FIG. 8C, when the funnel yoke portion 201 is formed in a substantially pyramid shape and the deflection yoke 202 is formed along the pyramid shape, the tube axis Z of the screen-side end 203a of the horizontal deflection coil 203 is formed.
8A is smaller than the dimension D1 of the horizontal deflection coil 110 in the conical deflection yoke in FIG. 8A and closer to the electron beam, so that the horizontal deflection magnetic field as shown in FIG. The center of gravity of the distribution MF2 moves to the screen side.

[0010] For this reason, when the degree of inconsistency of the inline self-convergence system is represented by rasters (both side beams) 204 and 205 on the screen in FIG. 9, one of the inconsistencies is a trilemma (Tr = XH-YH + PQ).
V) increases in the positive direction, and the convergence quality deteriorates.

As a means for correcting this, it is conceivable to first retreat the screen side of the horizontal deflection coil 203 to the neck side in the tube axis direction, but this is not practical because the deflection sensitivity is lowered.

A second method is to extend the neck side of the horizontal deflection coil 203 to the neck side in the tube axis direction.
As shown in (c), in a conventional so-called bend-up type coil in which the neck-side bridging portion 206 is wound in the radial direction almost away from the electron beam as the number of turns increases, the demagnetizing field in the neck-side direction Because of the large leakage, the amount of elongation was large, and the structure was not practical.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and it is an object of the present invention to provide a cathode ray tube device having a pyramidized funnel yoke portion and a generally circular neck portion without deteriorating the convergence quality. It is an object of the present invention to provide a cathode ray tube device and a deflection yoke in which the number is further reduced.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cathode ray tube device in which a funnel yoke has a substantially pyramid shape. A cathode ray tube device characterized by having a so-called bendless shape wound so as to be wound substantially in the tube axis direction along the neck outer surface without being wound in a direction substantially away from the electron beam with an increase in the number. Used.

According to the present invention, at least a panel portion having a phosphor screen on an inner surface, a neck portion having an electron gun disposed inside facing the screen and a yoke portion connected to the screen side of the neck portion are provided. When the outer shape of the panel portion is approximated by a circle based on a drop of the diagonal end of the screen with respect to the center of the screen toward the neck portion in the tube axis direction, the radius of curvature of the outer shape of the panel approximated by the circle is When the flatness is at least twice the screen diagonal effective dimension and the space between the tube axis and the outer surface of the yoke portion is a yoke portion outer diameter in a cross section perpendicular to the tube axis, the yoke portion is perpendicular to the tube axis. A non-circular vacuum envelope having at least one cross section of any cross section having a maximum yoke outside diameter between a vertical axis direction and a horizontal axis direction of the screen; and the yoke section A horizontal and vertical deflection coil that is disposed outside the vacuum envelope from the neck to the neck and deflects the electron beam emitted from the electron gun in the horizontal and vertical directions, and has a non-circular cross section perpendicular to the tube axis. In a cathode ray tube device comprising at least a deflection yoke having at least a core part having high magnetic permeability, a horizontal deflection coil of the deflection yoke connects a parallel line portion along the tube axis with the parallel line portion and is perpendicular to the tube axis. And a crossover portion arranged on the screen side and the neck portion side along a predetermined direction, and the crossover portion on the neck portion side is wound along the outer surface of the neck portion in the tube axis direction. A cathode ray tube device characterized by being rotated.

The present invention also provides a cathode ray tube device wherein the crossover portion on the neck portion side is wound in a single layer along the outer surface of the neck portion.

Further, according to the present invention, the cross section of the outer surface of the yoke portion of the envelope and the inner surface of the core portion of the deflection yoke perpendicular to the tube axis is substantially rectangular and non-circular, and the deflection coil is formed of the yoke portion. And a cathode ray tube device which is arranged between the core portion and the non-circular shape and is formed in the non-circular shape.

Further, the present invention provides a cathode ray tube in which a panel on which a phosphor screen is formed, a substantially pyramid-shaped yoke on which a deflection yoke is mounted, and a neck on which an electron gun is arranged are arranged along a tube axis. Wherein the deflection yoke generates a horizontal deflection magnetic field, a saddle-type horizontal deflection coil, a saddle-type vertical deflection coil that generates a vertical deflection magnetic field, and a core portion surrounding these coils. The horizontal deflection coil is formed of a loop coil including a pair of parallel wire portions, a crossover wire portion on the phosphor screen side connecting the parallel wire portions, and a crossover wire portion on the neck portion side. Is wound around the neck portion so as to be wound in the tube axis direction along the outer surface of the neck portion.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a cathode ray tube envelope according to an embodiment of the present invention has a screen diagonal end 9d with respect to a screen center 9a.
When the flatness of the outer surface of the panel 7 is shown by circular approximation based on the drop d toward the neck portion 11 in the tube axis (Z-axis) direction, the radius of curvature is twice the diagonal effective dimension of the screen 9. The present invention is applied to a cathode ray tube device having the above flatness and a funnel yoke portion 12 having a pyramid shape.
The present invention is applied to a cathode ray tube device employing a non-circular deflection yoke whose inner diameter becomes maximum between the vertical axis direction and the horizontal axis direction of the screen 9.

That is, the most suitable cathode ray tube envelope for mounting the deflection yoke 16 of the present invention is, as shown in FIG. 1, a panel portion 14 having a phosphor screen 9 formed on an inner surface thereof.
A funnel part 13 having a yoke part 12 having a small cross-sectional diameter, and a neck-side end part 1 of the yoke part 12 opposite to the panel part 14.
7 and a neck portion 11 in which the electron gun 5 is built.

Further, a shadow mask 10 facing the phosphor screen 9 is incorporated in the envelope.

FIG. 3 shows an example of a deflection reference position 2 on the tube axis.
2 shows a cross section of the yoke portion 12 perpendicular to the tube axis 0 (see FIG. 1).

In the above cross section, the distance (outer diameter) from the tube axis to the outer surface of the yoke portion from the tube axis Z to the horizontal axis H, vertical axis V, and diagonal axis D of the screen is L.
Assuming that A, SA, and DA, the pyramid-shaped yoke 12 has LA
And SA are smaller than DA, and as a result, the deflection coils near the horizontal and vertical axes can be brought closer to the electron beam to reduce the deflection power. Here, the diagonal axis direction distance DA having the maximum diameter is in the diagonal axis direction of the screen, but may not exactly match.

The shapes other than the three axes described above include an arc having a center on the horizontal axis and a radius Rh and a center having a center on the vertical axis and a radius Rv.
And a shape centered near the diagonal axis and connected by an arc of radius Rd. In addition, a substantially rectangular cross section may be created using various mathematical expressions.

As described above, the cross section of the yoke portion is a substantially rectangular non-circular shape having a bulge larger than the long side L and the short side S of the rectangle, and has a mold cross section as an example.

As the cross-sectional shape of the yoke portion approaches the rectangular shape, the strength as the vacuum envelope decreases, and the deflection power decreases. Therefore, (LA + SA) / (2DA) (1) is set as an index indicating the degree of rectangularity. If it is a normal conical yoke, LA, S
The value is 1 because A is equal to DA.

When the yoke portion is formed into a pyramid, DA is almost constant from the margin of the outermost electron beam trajectory.
A and SA become smaller, and the value becomes smaller. When the pyramid is completely formed, if the rectangular aspect ratio is M: N (the ratio of the length in the horizontal axis direction to the length in the vertical axis direction), (M + N) / (2 (M ² + N ² ) ^1/2 ) ... (2)

The above-mentioned index is a form in which the reduction of the outer diameter in the horizontal and vertical directions of the yoke part is combined. According to the simulation analysis results, it is possible to obtain a rectangular shape only in the horizontal direction or a rectangular shape only in the vertical direction. There is almost the same effect of reducing the deflection power, there is no need to attach importance to either LA or SA, and there is no problem with the index.

Also, the effect of the yoke section rectangularization due to the difference in the tube axis position was analyzed, and as a result, as shown in FIG. 1, the screen end 16a of the deflection yoke 16 was moved from the deflection reference position 20 (generally referred to as a reference line). Yoke part 12
It has been found that the rectangularization of the area is important.

Here, the deflection reference position 20 corresponds to FIG.
As shown in (a) and (b), when a straight line is formed between the screen diagonal ends 9d sandwiching the tube axis and a point O on the tube axis, the angle formed by the two straight lines is the maximum deflection defined by the cathode ray tube. The position on the tube axis, which is the angle θ, is the position that is the center of deflection.

FIG. 1 shows an example of an electron beam trajectory in which an electron beam e is deflected by a deflection yoke 16 to a screen diagonal end 9d. In this case, when the center of the deflection magnetic field is closer to the neck side end portion 17 than the deflection reference position 20, the magnetic field is strengthened on the neck side, so that the electron beam e is quickly deflected and collides with the inner wall of the yoke portion 12. Conversely, the deflection reference position 20
On the screen 9 side, the margin between the electron beam e and the inner wall of the yoke part 12 increases, and the deflection power can be further reduced by extending the neck side end 16b of the deflection yoke 16 accordingly.

Even in cathode ray tubes having different neck diameters, the difference in the shape of the yoke is substantially up to the deflection reference position 20, and the shape of the yoke on the screen side is substantially the same, so that the analysis results are substantially the same. is there.

The deflection yoke 16 of the present invention is shown in FIGS.
As shown in the figure, the saddle which is assembled by the horizontal and vertical coils 1 and 3 and the cylindrical core 4 having high magnetic permeability fixed on both walls of the bosh-shaped cylindrical synthetic resin separator 2 and has a small leakage magnetic field. -It is a saddle type. The horizontal deflection coil 1 is mounted on the inner surface of the separator 2, and the vertical deflection coil 3 is mounted on the outer surface of the separator 2. The core 4 is fixedly arranged so as to surround the outside, and forms a magnetic core or a return path for the deflection magnetic field.

As shown in FIG. 1, the shape of the outer surface along the tube axis of the envelope extends from the funnel portion 13 to the neck portion 11 so as to protrude outward at the funnel portion 13 on the screen side and to be concave at the yoke portion 12. It has a substantially S-shaped curve, and the boundary 18 of the yoke portion 12 of the funnel portion 13 is an inflection point of the curve.

The deflection yoke 16 has an edge 1 on the panel 7 side.
6a is mounted near the inflection point 18, and the substantial funnel yoke 12 is connected to the deflection yoke end 16a at least from the connection 17 with the neck 11.
Up to.

Next, the effect of reducing the deflection power will be described.

FIG. 5A shows the degree of reduction in the deflection power with respect to the index value of the rectangularity. Here, the calculation was performed with the specifications of the deflection yoke fixed and the deflection coil and core as close to each other as the rectangular yoke portion. As the deflection power, the horizontal deflection power was used. As shown in FIG. 5A, when the index value becomes smaller than approximately 0.86, the effect of abrupt reduction appears, and the power is reduced by about 10 to 30% with respect to the conical yoke. Conversely, if it is 0.86 or more, the reduction effect is only 10% or less.

Summarizing the above, as a method for achieving both reduction of deflection power and securing of vacuum stress and strength, an aspect ratio of a substantially rectangular screen scanned by deflection of a deflection yoke is set to M: N, and a deflection reference position ( When the outer diameter of the vertical yoke portion is SA, the outer diameter of the horizontal yoke portion is LA, and the maximum outer diameter of the yoke portion is DA in the cross section perpendicular to the tube axis at the reference line, (M + N) / (2 ( M ² + N ^{2) 1/2)} constitutes <a (SA + LA) / (2DA ) ≦ 0.86 ......... (3) and so as to yoke portion shape.

At this time, as shown in FIG. 3, the cross section of the outer surface of the yoke portion 12 which is perpendicular to the tube axis at the deflection reference position has a substantially rectangular shape with slightly bulging sides. It was approximated by an arc of radius Rv centered on the vertical axis, an arc of radius Rh centered on the horizontal axis, and an arc of radius Rd centered on a straight line connecting the point of maximum outer diameter and the pipe axis. At this time, the shape of the yoke is configured so that Rh or Rv is 900 mm or less.

The above is applicable to 16: 9, 3: 4, etc. other than the screen aspect ratio of 4: 3.

In the case of the deflection yoke, the index of the rectangularity of the core is determined in consideration of the coil product. It has been found that the index value of the rectangularity is not effective unless it is approximately 0.90 or less. As shown in FIG. 7, the horizontal deflection coil 1 forming a part of the deflection yoke has a parallel line portion 21 extending along the tube axis.
And crossover lines 22a and 22b connecting them.
The crossover portions 22a and 22b are arranged in a direction crossing the tube axis, that is, around the tube axis. Crossover 22a, 2
2b is composed of a crossover portion 22a on the screen side and a crossover portion 22b on the neck side, and the latter extends so as to be wound in the tube axis direction along the outer surface of the neck portion.

FIG. 6 shows the shape of the core of the deflection yoke. That is, (a) is an end 4a on the screen side of the core 4,
(B) similarly shows the end 4b on the neck side. The inner diameter of the core 4 (the distance from the tube axis to the inner surface of the core in a cross section perpendicular to the tube axis) is substantially the same circular shape on the neck portion of the envelope and its connecting portion in accordance with the shape of the neck portion and the yoke portion. However, the maximum inner diameter DB of the core 4 in a cross section perpendicular to the tube axis as approaching the screen side along the tube axis.
In contrast, the outer diameters LB and SB in the core long axis and short axis directions gradually change, and the cross section perpendicular to the tube axis has a substantially rectangular shape (non-circular shape). In the example of this figure, the screen aspect ratio M: N (horizontal to vertical) is 4: 3.

That is, the outer shape of the cross section perpendicular to the tube axis of the neck portion is circular, and the yoke portion 4 changes its non-circular shape from the portion connected to the neck portion to the panel side. At least one cross section perpendicular to the tube axis of the core 4 is substantially circular at the neck, and has a maximum core inner diameter between the horizontal axis direction and the vertical axis V direction of the screen having the aspect ratio M: N on the yoke portion. forms a non-circular shape having a vertical axis core inner diameter of the deflection yoke SB, when the horizontal axis core inner diameter LB, a maximum core inner diameter and DB, (M + N) / (2 (M 2 + N 2) 1 / ² ) <(SB + LB) / (2DB) ≦ 0.90 (4)

In the cathode ray tube device configured as described above,
As shown in FIG. 8C, when a deflection yoke in which the neck-side crossover portion 206 of the conventional horizontal deflection coil is wound in a direction substantially away from the electron beam with an increase in the number of turns is used.
As shown in FIG. 8D, the center of gravity of the magnetic field for horizontal deflection relatively moves to the screen side, so that the convergence trilemma (Tr) shown in FIG. 9 increases in the positive direction, and the above-described problem occurs.

In order to solve this problem, FIG.
If the bendless means for winding the crossover portion 22b of the winding of the horizontal deflection coil 1 around the neck side along the tube axis as in the present invention is used, the leakage of the reverse magnetic field in the neck side direction is reduced. Therefore, as shown in FIG. 8 (f), the deflection center of gravity M0 of the deflection magnetic field distribution MF3 moves toward the neck side, and the positive trilemma can be corrected. Also, the reduction in the reverse magnetic field itself in the neck side direction improves the deflection efficiency as compared with the bend-up shape in which the crossover portion 206 is wound in the radial direction away from the electron beam as shown in FIG. 8C. , The deflection power can be reduced.

Although the yoke of the conventional funnel has a substantially conical picture tube device, the neck-side crossover portion 110a (FIG. 8A) of the horizontal deflection coil may be bent. Although the leakage of the reverse magnetic field is reduced toward the neck side, the deflection sensitivity is improved, but the electron beam collides with the inner surface of the vacuum envelope due to the retreat of the deflection center of gravity toward the neck side, as shown in FIG. However, since the so-called neck shadow 104 is generated, the entire coil has to be moved to the screen side as a result, and there is no advantage that the neck-side crossover portion 110a is formed in a dress shape.

According to the present invention, in a cathode ray tube device provided with a vacuum envelope in which a yoke portion of a funnel is formed into a substantially pyramid shape and a non-circular deflection yoke core, at least a crossover portion on the neck side of a horizontal deflection coil is provided. By adopting a bendless shape, it is possible for the first time to achieve a balance between deflection sensitivity and convergence, which could not be achieved conventionally.

[0048]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the arrangement of a deflection yoke and the like of a cathode ray tube device according to an embodiment of the present invention.

A vacuum envelope comprising a panel 7 having a phosphor screen 9 formed on the inner surface thereof, a funnel-shaped funnel 13 connected to the panel 7, and a cylindrical neck 11 connected to the funnel. It has a vessel 15. A deflection yoke 16 having a non-circular core 4 is mounted from the neck portion 11 to the funnel portion 13, and the funnel has a diameter from a connection portion 17 with the neck portion 11 to a position 16 a where the deflection yoke 16 is mounted. It has a small part, a so-called yoke part 12. This yoke portion 12 is also formed in a non-circular shape. The phosphor screen 9 formed on the inner surface of the panel 7 includes a plurality of phosphor layers that emit red, green, and blue light, respectively, and the neck portion 11 has an electron beam that emits a plurality of electron beams corresponding to the emission colors. A gun 5 is arranged. Further, a shadow mask 10 having a color selection function fixed to the frame 8 is provided inside the panel 7 between the electron gun 5 and the phosphor screen 9, and shapes the electron beam e emitted from the electron gun 5. Then, a beam spot is projected on the phosphor layer of a specific color.

In this color cathode ray tube, the electron gun 5
Is an in-line type that emits three electron beams arranged in a line as in the prior art. The three electron beams arranged in a line and emitted from the electron gun are used as a deflection yoke 1 having a non-circular core.
By deflecting by the pincushion-type horizontal deflection magnetic field and the barrel-type vertical deflection magnetic field generated by 6, the image is concentrated on the entire screen without requiring any special correction means.

In particular, in this cathode ray tube, the yoke portion 12 to which the deflection yoke 16 is mounted is formed in a substantially pyramid shape. Here, the deflection yoke 16 is a saddle-saddle type having a small leakage magnetic field, and holds and fixes the vertical deflection coil 3, the horizontal deflection coil 1, and the core 4 with a cylindrical synthetic resin separator 2.

As shown in FIG. 7, the horizontal deflection coil 1 has a parallel line portion 21 which is concentrated and wound in the horizontal axis direction and extends in the tube axis direction, and a crossover on the screen connecting the parallel line portions 21. It is formed in a loop composed of the wire portion 22a and the crossover wire portion 22b on the neck portion side. These loops form a pair and are wound 30 to 40 times so as to form a pincushion magnetic field in the vertical axis direction of the envelope. The crossover portion 22b on the neck portion side is wound in a direction crossing the tube axis, that is, around the tube axis so as to be rolled up along the outer surface of the neck portion, and is not bent like a conventional coil (bendless shape). Shape).

The outer shape of the envelope along the tube axis is shown in FIG.
As shown in FIG. 5, the large diameter portion 6 of the funnel portion 13 has a substantially S-shaped curve projecting outward and the yoke portion 12 has a substantially S-shaped curve from the funnel portion 13 to the neck portion 11. The boundary 18 between the and the yoke portion 12 is a substantially inflection point of the same curve.

Hereinafter, the effect of reducing the deflection power will be described. FIG. 5B shows the displacement of the outer diameter of the yoke portion of the envelope along the tube axis. The connection portion with the neck portion has a substantially circular shape. When the outer diameter of the yoke portion in the vertical axis direction is SA, the outer diameter of the yoke portion in the horizontal axis direction is LA, and the outer diameter of the yoke portion in the diagonal axis direction is DA, SA / DA = LA / DA = 1.0.

As approaching the screen side, the major axis and minor axis outer diameters LA and SA are gradually reduced with respect to the diagonal axis outer diameter DA, and the cross section perpendicular to the tube axis is substantially shaped. It has a rectangular shape (non-circular shape). The index value of the rectangularity is formed to be approximately 0.86.

Further, in the case of the deflection yoke, the index of the rectangularity of the core is determined in consideration of the coil product. In this way, the index value of the rectangularity is set to approximately 0.88.

FIG. 6 shows the shape of the core portion according to the embodiment of the present invention. The core 4 has substantially the same circular shape as the shape of the yoke portion of the funnel at the connecting portion with the neck portion as shown in FIG. 6B. When the vertical core diameter at the neck end of the core 4 is SBN, the horizontal core diameter is LBN, and the diagonal core diameter is DBN, SBN / DBNk = LBN / DBN = 1.0.

As shown in FIG. 6 (a), the core 4 changes so that the long axis and short axis inner diameters LB and SB gradually become smaller with respect to the diagonal axis inner diameter DB as shown in FIG. The cross section perpendicular to the tube axis has a substantially rectangular shape (non-circular shape). In this embodiment, the aspect ratio of the screen is set to M: N = 4: 3.

Further, at the opening of the core 4 on the screen side, DB = 48.2 mm. LB = 44.7 mm, SB =
39.8 mm, (LB + SB) / (2DB) = O. 88. The deflection power could be reduced by about 18% with respect to a cathode ray tube having a conical yoke.

However, here, LB: SB (the ratio of the distance in the long axis direction to the distance in the short axis direction) in one section of the inner diameter of the core 4 on the screen side is the aspect ratio M: N of the screen (the distance between the long axis direction of the screen and the long axis distance). Since the ratio is approximately equal to 4: 3 in the short-axis direction, the conical deflection yoke (FIG. 8) is provided on the screen side of the deflection yoke as shown in FIG.
Compared with (a), the horizontal deflection magnetic field approaches the electron beam more than the vertical deflection magnetic field, and the trilemma, which is an index of the convergence quality, becomes positive and the convergence deteriorates. To correct this, FIG. As shown in ()), the crossover portion 22b on the neck portion side of the horizontal deflection coil 1 is not wound around in the direction substantially away from the electron beam as the number of windings increases, but is wound substantially in the tube axis direction along the outer surface of the neck portion. A so-called bendless shape wound so as to be stacked.

By reducing the leakage of the reverse magnetic field in the direction toward the neck, the center of gravity M0 of the horizontal deflection magnetic field MF3 moves toward the neck, as shown in FIG. To ensure good convergence.

[0062]

As described above, according to the configuration of the present invention, the deflection power can be effectively reduced without deteriorating the convergence quality, and the cathode ray tube device and the deflection yoke satisfying the requirement of high frequency deflection can be obtained. .

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view particularly showing a deflection yoke shape according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of the funnel yoke portion perpendicular to the tube axis according to the embodiment of the present invention.

4A and 4B are views for explaining a deflection center in one embodiment of the present invention, wherein FIG. 4A is a longitudinal sectional view and FIG. 4B is a plan view.

5A is a characteristic diagram showing the relationship between the deflection power and the shape of the yoke, and FIG. 5B is a curve diagram showing the shape of the yoke.

FIGS. 6A and 6B are cross-sectional views of a core part of a deflection yoke.

FIG. 7 is a perspective view showing a horizontal deflection coil of the deflection yoke according to the embodiment of the present invention.

FIGS. 8A to 8F are diagrams showing a comparison between the structure and characteristics of a conventional device and the present invention.

FIG. 9 is a diagram showing a misconvergence trilemma (Tr).

10A and 10B are views for explaining an envelope of a conventional cathode ray tube device, wherein FIG. 10A is a cross-sectional view and FIG. 10B is a plan view.

11 (a) is a side view, and FIGS. 11 (b) to 11 (f) are diagrams illustrating (a) B-
Sectional drawing cut | disconnected along the B line or the FF line.

[Explanation of symbols]

 1: Horizontal deflection coil 2: Separator 3: Vertical deflection coil 4: Core section 5: Electron gun 9: Phosphor screen 11: Neck section 12: Yoke section 14: Panel section 15: Vacuum envelope 16: Deflection yoke 21: Parallel line portion 22a: Screen side crossover portion 22b: Neck portion side crossover portion

Claims (4)

[Claims] 1. A display device comprising: a panel portion having at least a phosphor screen on an inner surface; a neck portion having an electron gun disposed inside facing the screen; and a yoke portion connected to the screen side of the neck portion. When the outer shape of the panel portion approximates a circle based on a drop of the diagonal end of the screen with respect to the center of the screen toward the neck portion in the tube axis direction with respect to the center of the screen, the radius of curvature of the outer shape of the panel approximates the circle. When the flatness is at least twice the diagonal effective dimension and the space between the tube axis and the outer surface of the yoke portion is the yoke portion outer diameter in a cross section perpendicular to the tube axis, any yoke portion perpendicular to the tube axis. A non-circular vacuum envelope having at least one cross section having a maximum yoke outside diameter between a vertical axis direction and a horizontal axis direction of the screen; and A horizontal and vertical deflecting coil, which is disposed outside the vacuum envelope over a hook portion and deflects an electron beam emitted from the electron gun in horizontal and vertical directions, and has a non-circular inner surface in a cross section perpendicular to the tube axis. A deflection yoke having at least a core part having a high magnetic permeability, wherein a horizontal deflection coil of the deflection yoke connects a parallel line portion along the tube axis to the parallel line portion and the tube axis direction. A crossover portion arranged on the screen side and the neck portion side along a direction crossing the crossover portion, such that the crossover portion on the neck portion side is wound in the tube axis direction along the outer surface of the neck portion. A cathode ray tube device characterized by being wound. 2. The cathode ray tube device according to claim 1, wherein the crossover portion on the neck portion side is wound in a single layer along the outer surface of the neck portion. 3. The non-circular cross section of the outer surface of the yoke portion of the envelope and the inner surface of the core portion of the deflection yoke perpendicular to the tube axis is substantially rectangular and non-circular, and the deflection coil includes the yoke portion and the core portion. 2. The cathode ray tube device according to claim 1, wherein the cathode ray tube device is arranged between the members and formed into a non-circular shape. 4. A cathode ray tube in which a panel on which a phosphor screen is formed, a substantially pyramid-shaped yoke on which a deflection yoke is mounted, and a neck on which an electron gun is disposed are mounted along a tube axis. The deflection yoke, wherein the deflection yoke comprises a saddle-type horizontal deflection coil for generating a horizontal deflection magnetic field, a saddle-type vertical deflection coil for generating a vertical deflection magnetic field, and a core portion surrounding these coils, The horizontal deflection coil is formed by a loop coil including a pair of parallel line portions, a crossover portion on the phosphor screen side connecting the parallel line portions, and a crossover portion on the neck portion side, and the crossover on the neck portion side. A deflection yoke, wherein a wire portion is wound so as to be wound in the tube axis direction along the outer surface of the neck portion.