KR100571198B1 - Cathode ray tube - Google Patents

Abstract

Disclosed is a cathode ray tube which has a radius of curvature of each diagonal portion of the deflection yoke mounting area of two or more to disperse the tensile stress concentrated on the diagonal portions, thereby improving air pressure strength, deflection sensitivity, and ensuring sufficient margin of BSN. It is about.

The disclosed cathode ray tube has at least two or more outer contours on its respective diagonal axis when the cross-sectional shape in the direction perpendicular to the tube axis in the cross section of the pyramidal deflection yoke mounting region to which the deflection yoke is mounted has an approximately rectangular shape. A diagonal radius of curvature is formed, and the two radii of curvature have a value different from a diagonal radius of curvature near the long side and a diagonal radius of curvature near the short side when the center is on the diagonal axis.

As a result, the workability is improved during the funnel manufacturing while securing sufficient atmospheric pressure strength and BSN in the wide angle cathode ray tube.

Description

Cathode Ray Tube             

1 to 7 is a configuration diagram provided for the description of the color cathode ray tube according to the prior art,

1 is a perspective view of the color cathode ray tube seen from behind;

2 is a cross-sectional view along the tube axis of the color cathode ray tube,

3 is a cross-sectional view taken along line II of FIG. 1,

4 is a view for explaining the stress generated in the deflection yoke mounting region of FIG.

5 to 9 is a configuration diagram showing an embodiment provided for the description of the cathode ray tube according to the present invention,

5 is a perspective view of the cathode ray tube seen from behind;

6 is a cross-sectional view taken along line II-II of FIG. 5,

FIG. 7 is a cross-sectional view taken along line III-III of FIG. 5 to describe the diagonal radius of curvature of the deflection yoke mounting region.

8 is an enlarged view of a diagonal portion of the deflection yoke mounting region of FIG. 7;

FIG. 9 is a cross-sectional view taken along the line IV-IV of FIG. 5, showing only the upper half with respect to the tube axis;

FIG. 10 is a cross-sectional view taken along line III-III of FIG. 5, showing another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: Effective part 2: Skirt part

3: face panel 4: funnel

7: neck 8: electron beam

9: electron gun 10: vacuum outer container

50: deflection yoke mounting area 51, 52, 53: arc

54: short side 55: long side

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cathode ray tubes such as color receivers, color monitors, and the like. In particular, the diagonal curvature of a cathode ray tube having a pyramidal deflection yoke mounting area due to wide angle is multiplexed to reduce the thickness of the funnel yoke portion. The present invention relates to a cathode ray tube which minimizes the margin of the neck shadow (BSN) while minimizing the deflection and optimizing the pressure resistance of the funnel.

For example, a color cathode ray tube generally consists of a glass face panel having a generally rectangular display portion, a funnel-shaped glass funnel connected to the face panel and a cylindrical glass neck connected to the funnel in a vacuum appearance container. Equipped with.

In the neck, an electron gun that emits three electron beams is installed. Also, a deflection yoke is fitted from the outer circumference of the neck to the outer circumference of the funnel.

The funnel has a deflection yoke mounting area extending from the connection with the neck to the position where the deflection yoke is mounted.

In such a cathode ray tube, the electron gun is of an in-line type that emits three electron beams arranged in a row on the same horizontal plane, and the pincushion and vertical deflection magnetic fields generate a horizontal deflection magnetic field in which the deflection yoke is generated. Barrels are used to deflect three arrayed electron beams emitted from the electron gun by the horizontal and vertical deflection magnetic fields, thereby concentrating three electron beams in a row arrangement throughout the screen without requiring any special correction means. Self-converging inline color cathode ray tubes using non-uniform magnetic fields have been widely used.

In general, however, the deflection yoke is designed based on the funnel. However, in the case of the pyramidal funnel and the deflection yoke structure, in the design of the funnel cone portion, the so-called deflection yoke mounting area, the explosion-proof characteristics and the neck shadow (BSN) are used. : Set the optimum inner shape in consideration of Beam Strike Neck, modeling deflection yoke shape → electron beam trajectory calculation → funnel bulb stress analysis → deflection yoke redesign (DY shape modeling) The funnel must be designed based on the deflection yoke (DY), as in the order of sensitivity consideration.In this way, the funnel outer design is designed to improve the internal pressure strength considering deflection sensitivity and explosion resistance while the internal value of the funnel is almost fixed. Optimization was required.

As an example of such a conventional cathode ray tube, a colored cathode ray tube is shown in FIGS. 1 and 2.

The color cathode ray tube includes a vacuum outer container 10 made of glass.

The vacuum outer container 10 includes a face panel 3 having an almost rectangular effective portion 1 and a skirt portion 2 provided at the periphery of the effective portion, and a funnel-shaped funnel joined to the skirt portion 2. 4) and a cylindrical neck 7 extending from the funnel.

The effective part 1 of the face panel 3 is formed in the substantially rectangular shape which has the horizontal axis H and the vertical axis V orthogonal to each other through the tube axis Z of a cathode ray tube.

Furthermore, the deflection yoke 6 is mounted on the outside from the neck 7 side to the funnel 4 side, and the funnel 4 is connected from the connection with the neck 7 to the position at which the deflection yoke 6 is mounted. It has a small diameter part which extends toward the face panel 3 side, what is called a deflection yoke mounting area 12. As shown in FIG.

On the inner surface of the effective portion 1 of the face panel 3, a three-color phosphor layer having a dot or stripe shape which emits light in blue, green and red, and the phosphor A phosphor screen 5 made of a stripe-shaped light shielding layer formed between the layers is provided.

Also, in the vacuum outer container 10, a shadow mask 11, which is a color screening electrode, is disposed inside the opposing phosphor screen 5 on the inside.

In the neck 7, an electron gun 9 for emitting three electron beams 8 is provided. The three electron beams 8 emitted from the electron gun 9 are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 6, and the fluorescent screen 5 is horizontally and vertically scanned through the shadow mask 11. The color image is displayed by doing.

The deflection yoke mounting region 12 of the funnel 4 to which the deflection yoke 6 is mounted in the cathode ray tube is formed in a substantially pyramidal shape. Here, the deflection yoke 6 is typically a saddle-shaped, cylindrical synthetic resin frame that fixes the vertical deflection coil, the horizontal deflection coil and the core. Specifically, the pyramidal deflection yoke mounting region 12 has a cross-sectional shape perpendicular to the tube axis Z in the vicinity of the connection portion with the neck 7, but is substantially circular like the neck 7, but along the tube axis Z direction. In the vicinity of the center portion and near the end portion on the side of the phosphor screen 5, as shown in Fig. 3, the shape is substantially rectangular to match the shape of the effective portion 1 of the face panel 3.

As shown in FIG. 3, in the portion where the cross-sectional shape is formed almost rectangular, the cross-sectional outer contour of the deflection yoke mounting region 12 is in the horizontal, vertical, and diagonal directions of the effective portion 1 included in the face panel 3. When having a horizontal axis (H: long axis), a vertical axis (V: short axis), a diagonal axis (D), a pair of arcs 20 and a vertical axis (V) of a radius of curvature Roh centered on the horizontal axis (H) It has a nearly rectangular shape in which a pair of arcs 21 having a radius of curvature Rov centered on the center and a circular arc 22 of a radius of curvature Rod centered around the diagonal axis D are formed. .

That is, as shown in FIG. 3, in the cross section of the deflection yoke mounting region 12, the inner surface shape is the inner diameter La and the short axis in the major axis direction from the connection portion with the neck 7 to the short edge of the deflection yoke 6. The inner diameter Sa in the direction and the inner diameter da in the diagonal axis direction.

In FIG. 3, the deflection yoke mounting area 12 is formed in the direction of the outer diameter DA and the major axis in the diagonal axis D, which extends from the connection with the neck 7 to the screen side end of the deflection yoke 6, that is, the edge. It has an outer diameter LA and an outer diameter SA in the uniaxial direction.

As described above, the outer surface of the deflection yoke mounting region 12 has a circular shape having a shape substantially the same as that of the neck 7 at the connection portion with the neck 7, but as it moves toward the phosphor screen 5 side, the direction of the diagonal axis D is increased. The outer diameters LA and SA of the major axis and the minor axis direction are gradually decreased with respect to the external diameter DA of the shape, and the shape in the cross section perpendicular to the tube axis Z is almost rectangular.

In addition, when the long and short sides 25 and 24 of the inner contour are convex in the neck sealing surface direction with respect to the tube axis Z, the inner diameters La and Sa and the outer diameters LA and In order to avoid the extreme fall of the thickness of each part vicinity by the difference with SA), each inside part is formed in circular arc-shaped curved surface, ie, circular arc 22, 26 surface on both inner surface and outer surface.

Thus, if the deflection yoke mounting area 12 to which the deflection yoke is mounted is formed in the shape of a pyramid, the diameters of the deflection yoke in the long axis (horizontal axis: H axis) and short axis (vertical axis: V axis) directions can also be reduced. In addition, the deflection power can be reduced by efficiently deflecting the vertical deflection coil to the electron beam 8 passing through the electron beam passing region 23.

However, as described above, the outer contour of the pyramidal deflection yoke mounting region 12 of the cathode ray tube has a radius of curvature Roh of a long axis, a radius of curvature Rov of a short axis, and a diagonal axis perpendicular to the tube axis Z. In the state of forming a substantially rectangular shape in which the radius of curvature of the rods is continuous, if the diameter of the neck 7 or the external diameter of the deflection yoke mounting area 12 of the funnel 4 is simply reduced, the inline outer electron beam ( 8) collides with the inner wall near the neck 7 side of the funnel 4 and consequently a region where the electron beam 8 does not reach the phosphor screen 5, that is, a non-light emitting portion may occur. In addition, as the deflection yoke mounting region 12 becomes closer to a rectangle, as shown in FIG. 4, the horizontal axis vicinity 100 and the vertical axis vicinity 101 of the flat deflection yoke mounting region 12 by the atmospheric pressure load F are illustrated. When the distortion occurs in the direction shown by the broken line 103 Therefore, the compressive stress (σX, σY) is generated at the horizontal and vertical axis outer surfaces of the deflection yoke mounting region 12, and the large tensile stress (σD) is generated at the outer surface near the diagonal axis of the deflection yoke mounting region 12. The internal pressure of the outer container 10 is lowered in strength and the safety is impaired.

In general pyramidal cathode ray tube, the outer contour of the funnel has a long rectangular radius, short radius of curvature, and diagonal radius of curvature, which is a kind of continuous shape. In addition, there is a problem in that the production of funnel is not only difficult to work, there is a damage to the safety due to the decrease in the internal pressure strength, and also the thickness of the difference between the inner and outer diameter of the funnel has a problem that the material cost and weight is increased.

In particular, in the wide angled cathode ray tube, the electron beam margin due to the increase in the thickness of the diagonal portion of the pyramidal deflection yoke mounting region has difficulty in securing a margin.

Therefore, it is possible to reduce the generation of neck shadow due to the difference in thickness between the long, short, and diagonal portions of the tube axis, and to satisfactorily reduce the deflection power and satisfy the deflection sensitivity while ensuring sufficient air pressure strength of the vacuum outer container. A cathode ray tube having a deflection yoke mounting area is preferred.

Accordingly, it is an object of the present invention to provide a cathode ray tube which satisfies the smoothness and atmospheric pressure strength of the funnel fabrication, which form at least two curvature radii at the diagonal portions of the deflection yoke mounting area. It is characterized by dispersing intensively generated stress.

It is another object of the present invention to provide a cathode ray tube for optimizing deflection sensitivity and securing margin of neck shadow, and the cathode ray tube has a different radius of curvature on the long side and the short side of the deflection yoke mounting area, so that the diagonal of the funnel is different. It is characterized by dispersing the stress concentrated in the.

Cathode ray tube according to an aspect of the present invention for achieving the above object, at least a panel having a phosphor screen on the inner surface, a funnel connected to the panel, the end of the small diameter side of the funnel is bonded to the phosphor screen A cathode ray tube having a neck on which an electron gun is mounted to face each other, and a deflection yoke mounting area in an area extending from the end of the neck side toward the panel side,

At least one of the inner and outer contours of the deflection yoke mounting area of the approximately pyramidal funnel having a point where the cross-sectional shape in the direction perpendicular to the tube axis is maximized in addition to the horizontal axis and the vertical axis is at least two curvatures on their respective diagonal axes. It is characterized by having a radius connected to the short side on the vertical axis and the long side on the horizontal axis.

Optionally, the long side outer radius of curvature and the short side outer radius of curvature in a direction perpendicular to the tube axis are differently given according to a deflection angle.

Preferably, the ratio between the diagonal curvature radius near the long side and the diagonal curvature radius near the short side is defined to be at least one based on the center on the diagonal axis.

According to a cathode ray tube according to another aspect of the present invention for achieving the above object, at least a panel having a phosphor screen on the inner surface, a funnel connected to the panel, the end of the small diameter side of the funnel is bonded to the phosphor screen A cathode ray tube having a neck on which an electron gun is mounted to face each other, and a deflection yoke mounting area in an area extending from the end of the neck side toward the panel side,

When the inner and outer contours in the cross section of the deflection yoke mounting area are substantially barrel-shaped, increasing in the direction of the neck sealing surface with respect to the tube axis, they have at least two diagonal radii of curvature on their respective diagonal axes and are perpendicular to the tube axis. It is characterized by being connected to the short side and long side of the direction.

According to the cathode ray tube of the present invention, at least a panel having a phosphor screen on the inner surface, a funnel connected to the panel, a neck joined to a small diameter end of the funnel and mounted with an electron gun opposite the phosphor screen, and the neck A cathode ray tube having a deflection yoke mounting area in an area extending from a side end to a panel side,

An approximately pincushion shape in which the inner contour in the direction perpendicular to the tube axis in the cross section of the deflection yoke mounting area increases in the funnel direction with respect to the tube axis, and also increases in the neck sealing surface direction with respect to the tube axis while the outer contour goes in the direction of the horizontal axis and the vertical axis. When it has a substantially rectangular shape, characterized in that the outer contour of the rectangular shape has at least two or more diagonal curvature radii on each of the diagonal axis is connected to the short side on the vertical axis and the long side on the horizontal axis.

In this way, by forming a plurality of diagonal curvature radii of the outer contour in accordance with the inner and outer shapes of the pyramidal deflection yoke mounting region forming the boundary between the neck and the funnel, the stress concentrating on the diagonal is effectively dispersed, and the funnel is easily manufactured. As the thickness of the diagonal part can be minimized due to the dispersion of the tensile stress, it is understood that the margin of electron beam margin is secured and the degree of deflection is satisfied.

As a result, the generation of the neck shadow in the wide-angled cathode ray tube is suppressed, and there is an advantage that the demands of the internal pressure strength, high luminance, and high frequency deflection are satisfied.

And, there may be a plurality of embodiments of the present invention, the following will be described in detail for the most preferred embodiment.

Through this preferred embodiment, the objects, other objects, features and advantages of the present invention will become more apparent from the following description with an embodiment according to the present invention in connection with the accompanying drawings shown for illustrative purposes.

Hereinafter, exemplary embodiments of the cathode ray tube according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, the technique of the present invention can be applied to various image display apparatuses such as a color receiver, a color monitor, and the like.

In addition, in each figure used for description, the same component may be attached | subjected, and may show the same number, and the overlapping description may be abbreviate | omitted.

In addition, the following description considers an example of a color cathode ray tube which can be called an image display device as a product which visually displays an image.

5 is a perspective view from behind of the color cathode ray tube of the present invention, FIG. 6 is a cross-sectional view taken along line II-II of FIG. 5, and FIG. 7 is a cross-sectional view taken along line III-III of FIG. This is for explaining the diagonal radius of curvature of the region.

The color cathode ray tube according to this embodiment is provided with a vacuum outer container 10 made of glass.

The vacuum outer container 10 includes a face panel 3 having an almost rectangular effective portion 1 and a skirt portion 2 provided at the periphery of the effective portion, and a funnel-shaped funnel joined to the skirt portion 2. 4) and a cylindrical neck 7 extending from the funnel.

The effective part 1 of the face panel 3 is formed in the substantially rectangular shape which has the horizontal axis H and the vertical axis V orthogonal to each other through the tube axis Z of a cathode ray tube.

The funnel 4 also has a small diameter portion, so-called deflection yoke mounting region 50, which extends from the connection with the neck 7 to the position where the deflection yoke is mounted, that is, toward the face panel 3 side.

The deflection yoke mounting region 50 of the funnel 4 to which the deflection yoke is mounted in the color cathode ray tube is formed in a substantially pyramidal shape.

The pyramidal deflection yoke mounting region 50 has a circular cross section perpendicular to the tube axis Z in the shape of the same shape as the neck 7 near the connection with the neck 7, but near the center and along the tube axis Z direction. In the vicinity of the edge part of the screen 5 side, as shown to FIG. 6 and FIG. 7, it becomes substantially rectangular shape matched with the shape of the effective part 1 of the face panel 3. As shown in FIG.

As shown in Fig. 7, the cross-sectional outer contour of the deflection yoke mounting region 50 in the portion where the cross-sectional shape is formed almost rectangular is the horizontal axis H, the vertical axis (in the horizontal, vertical, and diagonal directions of the effective portion 1). V), when having a diagonal axis D, a pair of circular arcs 51 of a radius of curvature Roh centered on the horizontal axis H and a radius of curvature Rov centered on the vertical axis V A circular arc 53a having a radius of curvature (Rod-h) having a center near the horizontal axis (H) with respect to the pair of arcs 52 and the diagonal axis (D), that is, the center of the diagonal axis (D). V) it forms a substantially rectangular shape in which a circular arc 53b of a diagonal radius of curvature Rod-v having a center in the vicinity and a circular arc 53 of a diagonal radius of curvature Rod having a center on the diagonal axis D are continuous. have.

As shown in Fig. 9, the deflection yoke 6 is mounted such that the short edge 59 on the side of the panel 3 is located near the diagonal inflection point 60, and the substantially deflection yoke mounting area 50 is provided. ) Is at least up to the connection 58 with the neck 7.

In the cross section of the deflection yoke mounting region 50 of FIGS. 5 and 6, the inner surface shape is the short side inflection point 62 with respect to the coordinates in the direction of the tube axis Z in the long axis H, the short axis V, and the diagonal axis D. ), The diagonal inflection point 60 and the long side inflection point 61 are formed at the same coordinates, and the inner diameter in the major axis direction (lap) from the connecting portion 58 with the neck 7 to the short edge 59 of the deflection yoke and It has an inner diameter in the short axis direction and an inner diameter in the diagonal axis direction.

In addition, the outer surface shape of the deflection yoke mounting area 50 has an outer diameter DAP in the diagonal axis D direction from the connection portion with the neck 7 to the short edge 59 of the deflection yoke 6, and the inner diameter ( Lap) has an outer diameter (LAP) in the long axis (H) direction longer than the outer diameter (SAP) in the short axis (V) direction longer than the inner diameter (sap).

In particular, as shown in Figs. 6 and 9, the thickness of the deflection yoke mounting region 50 is a diagonal axis D and a horizontal axis in the cross section of the tube axis Z, which generally corresponds to the deflection center, generally referred to as the deflection reference line 57. It is represented by the difference between (H), the inner and outer diameters (lap, sap) and (LAP, SAP) in the vertical axis (V) direction.

In addition, the maximum vacuum stress is the maximum stress in the entire area of the deflection yoke mounting area 50, and in the case of the pyramidal deflection yoke mounting area 50, the deflection yoke is mounted slightly on the phosphor screen 5 side than the deflection reference line 57. The maximum stress in the tensile direction occurs in each corner of the region 50.

6 and 7, the inner surface shape of the deflection yoke mounting region 50 is not a perfect plane but a barrel shape in the neck sealing surface direction with respect to the tube axis Z. sap), (Lap, SAP) has the thickness of the long and short sides by the difference. That is, the inner contour of the deflection yoke mounting area 50 in the cross section orthogonal to the tube axis Z of the deflection yoke mounting area 50 is not a perfect rectangle, but each side gently projects in the neck sealing surface direction with respect to the tube axis Z. It is a convex curve and has inner diameter (lap, sap) in long and short axis directions.

Then, the short side 54 of the inner contour of the deflection yoke mounting region 50 is formed as a curve having a smooth top on the horizontal axis H, and each long side 55 is a vertical axis V. As shown in FIG. It is formed as a curve with a gentle top on).

As described above, when the long and short sides 55 and 54 of the inner contour of the deflection yoke mounting region 50 are formed in a gentle curve, the inner and outer diameters of the horizontal axis (H) and the vertical axis (V) directions are lap and LAP. Due to the increase in thickness, which is a difference from (sap, SAP), each of the inner and outer surfaces is formed by circular arc surfaces 53 and 56 of almost rectangular shape, and thus the inner surface of the deflection yoke mounting region 50. The electron beam passage region 23 can be brought close enough to secure an internal space.

In particular, the outer shape of the pyramidal deflection yoke mounting region 50 in the present invention, as shown in Figure 6 and 7, the horizontal axis (H), in the horizontal, vertical, diagonal direction on the phosphor screen (5) included in the panel, When having a vertical axis (V) diagonal axis (D), the outer contour in the direction perpendicular to the tube axis (Z) has a substantially rectangular shape, the inner contour is projected smoothly in the outward direction of the funnel with respect to each tube axis (Z) It has a barrel shape.

In the rectangular outer contour, at least two diagonal curvatures as described above to the diagonal portions (four corner portions) to which the circular arc 52 of the horizontal axis H and the circular arc 51 of the vertical axis V are connected. It has a radius.

In this manner, at least two curvature radii, preferably three curvature radii (Rod-h, Rod, Rod) according to the deflection angle of the electron beam, at a diagonal portion of the outer surface of the deflection yoke mounting region 50 having a rectangular shape. By giving -v), the tensile stress concentrating on the diagonal of the deflection yoke mounting area 50 can be effectively dispersed by the curvature radii to improve the workability in manufacturing the funnel 4.

In particular, according to the experiments of the present inventors, as shown in Figs. 7 and 8, in the outer surface shape of the deflection yoke mounting region 50, the cross-sectional shape is a diagonal curvature near the long side with respect to the center of the diagonal axis. When the radius is Rod-h and the diagonal curvature radius near the short side is Rod-v, Rod-v / Rod-h is larger than 1. In this manner, the ratio of the radius of curvature Rod-h near the long side to the radius of curvature Rod-v near the short side is set to 1 or more based on the radius of curvature Rod of the diagonal axis D. In this case, the appropriate tensile stress strength and the deflection power consumption can be reduced, thereby improving the deflection sensitivity and not causing the neck shadow (BSN).

In addition, on the outer surface of the deflection yoke mounting region 50, the radius of curvature Roh of the long side and the radius of curvature Rov of the short side are different from each other depending on the deflection angle of the electron beam. For example, in the case of a cathode ray tube having a pyramidal deflection yoke mounting area 50 having a screen size of 19 inches, the radius of curvature on the long side, the radius of curvature on the short side and the radius of curvature on the diagonal side are 105.84, 87.24. , 10.93, respectively, compensates for the compressive stress generated on the outer surface of the horizontal and vertical axes of the deflection yoke mounting area 50 and the large tensile stress occurring on the outer surface near the diagonal axis to compensate for the pressure resistance of the vacuum outer container. Appeared to be optimized. In particular, when the relationship between the outer radius of curvature Roh of the long side, the outer radius of curvature Rov of the short side and the diagonal radius of curvature Rod is set to Rod <Rov <Roh, the same effect as described above was obtained.

As such, by giving two or more radii of curvature to the diagonal portions of the outer surface of the deflection yoke mounting region 50 to effectively distribute the tensile stress occurring in the diagonal, the thickness of the diagonal portion can be reduced, and the thickness of the diagonal portion is reduced. As a result, the margin of electron beam margin can be secured in the wide-angle vacuum container.

10, the outer contour in the cross section of the pyramidal deflection yoke mounting region 50 is a substantially barrel-shaped shape that increases in the neck sealing surface direction with respect to the tube axis Z, and the inner contour is the tube axis ( Also in the case of a cathode ray tube having a pincushion shape which increases in the direction of the funnel 4 with respect to Z), i.e., protrudes in the direction of the tube axis Z, in the same manner as described above, at least two diagonal curvatures on each diagonal axis thereof. The same effect can be obtained even if it forms a radius and makes it continuous to the short side and long side in the direction orthogonal to the tube axis Z.

As a result, in the shape of the pyramidal deflection yoke mounting area of the present invention, a plurality of diagonal outer surface curvatures of each corner portion on the diagonal axis having the largest deflection angle are formed in accordance with the deflection angle of the electron beam between the deflection reference line and the inflection point. Thus, by dispersing the tensile stress, the thickness of the diagonal portion can be minimized, whereby interference does not occur with respect to the electron beam deflection trajectory, thereby improving the deflection sensitivity and the atmospheric pressure strength.

On the other hand, as a comparative example, the horizontal and vertical deflection coils of the deflection yoke are applied to the electron beam by using only one type of a conventional technology, that is, a long side radius of curvature, a short side radius of curvature and a diagonal radius of curvature of the pyramidal deflection yoke mounting region. Unlike close proximity, the present invention forms a plurality of diagonal curvature radii of the outer contour according to the inner and outer shapes of the pyramidal deflection yoke mounting area forming the boundary between the neck and the funnel to effectively disperse the tensile stress concentrated on the diagonal. Able to know.

As a result, according to the present invention, by effectively dispersing the stress concentrated in the diagonal, it is easy to manufacture the funnel, and the thickness of the diagonal portion can be minimized due to the dispersion of the tensile stress, thereby reducing the weight of the funnel and securing the margin of electron beam margin. And there is an advantage that the atmospheric pressure strength is satisfied.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that, according to the cathode ray tube according to the present invention, in the case of a wide angle deflection cathode ray tube having a shape of a pyramidal deflection yoke mounting region, the radius of curvature of the funnel diagonal portion is formed by two or more. The same effect can be obtained.

(1) The workability of the funnel manufacture is improved by effectively dispersing the tensile stress that occurs intensively at the diagonal of the pyramidal deflection yoke mounting area in the funnel fabrication.

(2) The thickness of the funnel yoke can be reduced by effective dispersion of the tensile stress, so that the weight of the funnel and the deflection consumption power can be reduced.

(3) Improvement of beam margin, pressure resistance and deflection sensitivity can be ensured due to diagonal thickness reduction of deflection yoke mounting area at wide angle.

Claims (8)

A panel having at least a phosphor screen on the inner surface, a funnel connected to the panel, a neck bonded to a small diameter end of the funnel and mounted with an electron gun opposite the phosphor screen, and an area extending from the end of the neck side to the panel side; A cathode ray tube having a deflection yoke mounting area in At least two of the inner and outer contours of the deflection yoke mounting area of the approximately pyramidal funnel having a point where the cross-sectional shape in a direction perpendicular to the tube axis is maximized in addition to the horizontal axis and the vertical axis are at least two or more on their respective diagonal axes. And a curvature radius connected to the short side on the vertical axis and the long side on the horizontal axis.        The method of claim 1,        A cathode ray tube, characterized in that the inner cross-sectional shape in the cross section of the deflection yoke mounting area is pincushion, and the outer cross-sectional shape is barrel shape. The method of claim 1, And a radius of curvature of the long side in the direction perpendicular to the tube axis and a radius of the outer curvature of the short side are different from each other according to a deflection angle so as to be connected with the diagonal radius of curvature. The method of claim 3, wherein Wherein when the outer radius of curvature of the long side is Roh, the outer radius of curvature of the short side is Rov, and the diagonal radius of curvature is Rod, the radius of curvature of the long side, short side and diagonal is given by Rod <Rov <Roh. The method of claim 1, The diagonal radius of curvature is a cathode ray tube, characterized in that the radius of curvature near the long side, the radius of curvature centered on the diagonal axis and the radius of curvature of the short side is continuous. The method according to claim 1 or 5, When the diagonal radius of curvature near the long side is referred to as Rod-h and the diagonal radius of curvature near the short side is referred to as Rod-v when the center of the diagonal axis is referred to, Rod-v / Rod-h is greater than 1 Cathode ray tube, characterized in that. A panel having at least a phosphor screen on the inner surface, a funnel connected to the panel, a neck bonded to a small diameter end of the funnel and mounted with an electron gun opposite the phosphor screen, and an area extending from the end of the neck side to the panel side; A cathode ray tube having a deflection yoke mounting area in When the inner and outer contours in the cross section of the deflection yoke mounting area have a substantially barrel shape that increases in the direction of the neck sealing surface with respect to the tube axis, they have at least two diagonal radii of curvature on their respective diagonal axes and are perpendicular to the tube axis. Cathode ray tube characterized in that connected to the short side and long side of the phosphorus direction.        The method of claim 7, wherein When the diagonal radius of curvature near the long side is referred to as Rod-h and the diagonal radius of curvature near the short side is referred to as Rod-v when the center of the diagonal axis is referred to, Rod-v / Rod-h is greater than 1 Cathode ray tube, characterized in that.

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