KR20000074156A - Cathode-ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided in which inner atmospheric pressure strength and ITC revolution margin are sufficiently secured and deflection power is effectively reduced to increase deflection sensitivity. CONSTITUTION: A cathode ray tube includes a panel having a fluorescent screen at the inner surface thereof, a funnel connected with the panel, a neck connected to the end of the portion having the smaller diameter of the funnel, at which an electron gun is placed, opposite to the fluorescent screen, and a deflection yoke accommodating area(50) between the end of the neck and the panel. When the cross section of the deflection yoke accommodating area, which is perpendicular to the axis(Z) of the cathode ray tube, has a rectangular shape, the ratio of the inner curvature radius of the shorter side near the deflection basis point on the axis of the cathode ray tube to the distance to the opposite angle is in the range of 0.110 to 0.180.

Description

Cathode Ray Tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cathode ray tubes such as color receivers, color monitors, and more particularly, to pyramid the deflection yoke mounting area of a wide-angle vacuum exterior container to induce a neck shadow (BSN). The invention relates to a cathode ray tube that optimizes the internal pressure strength, ITC rotational margin and deflection sensitivity of the funnel.

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

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.

However, in general, such a cathode ray tube has a deflection yoke designed based on a funnel, but in a pyramidal funnel and a deflection yoke structure, in the design of a funnel cone portion, a so-called deflection yoke mounting area, the deflection sensitivity and the trajectory of the electron beam are calculated by the explosion-proof characteristics and the neck. In consideration of shadow (BSN: Beam Strike Neck), an optimal internal and external design 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 X and the vertical axis Y 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 on 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 usually a saddle type, 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, which is circular in the shape of the neck 7 in the vicinity of the connection portion with 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 Figs. 3 and 4, a substantially rectangular shape is fitted to the shape of the effective portion 1 of the face panel 3.

As shown in FIG. 4, in a portion where the cross sectional shape is substantially 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 (X), a vertical axis (Y), a diagonal axis (D), the center of the pair of arcs 20 and a vertical axis (Y) of a radius (Rx) centered on the horizontal axis (X) A pair of arcs 21 of the excitation radius Ry and an arc 22 of the radius Rd having a center in the vicinity of the diagonal axis D are formed in a substantially rectangular shape.

In other words, in the cross section of the deflection yoke mounting area 12, the inner surface shape is the long axis inner diameter la and the short axis inner diameter sa from the connection with the neck 7 to the short edge of the deflection yoke 6. And an 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.

On the other hand, as shown in FIG. 3, the inner surface shape of the deflection yoke attaching area | region 12 is a pincushion shape which protruded in the tube-axis direction rather than a plane. That is, in the cross section orthogonal to the tube axis Z of the deflection yoke mounting region 12, the inner contour of the deflection yoke mounting region is not completely rectangular but is a convex curve in which each side protrudes in the direction of the tube axis Z.

The short side 24 of the inner contour of the deflection yoke mounting region 12 is formed as a convex curve having a top portion on the horizontal axis X, and each long side 25 is a convex curve having a top portion on the vertical axis Y. Formed.

In the case where the long and short sides 25 and 24 of the inner contour are convex curves, the angles due to the difference between the inner and outer diameters LA and SA in the major and minor axes are different. In order to avoid the extreme fall of the thickness in the vicinity of the part, each part is formed by the arc-shaped curved surface, ie, the arc (22, 26) surface on both the inner surface and the outer surface.

As shown in FIG. 5, the inner contour of the deflection yoke mounting region 12 and the thicknesses of the long and short sides in the direction perpendicular to the tube axis Z are shown in the deflection yoke mounting region 12. It is set in accordance with the shape of the electron beam passing-through region 23.

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: X axis) and short axis (vertical axis: Y axis) directions can also be reduced, so that the deflection yoke is mounted horizontally. In addition, the vertical deflection coil can be moved close to the electron beam 8 to efficiently deflect the deflection power.

However, in such a cathode ray tube, if the diameter of the neck 7 or the outer diameter of the deflection yoke mounting area 12 of the funnel 4 is simply reduced, the in-line outer electron beam 8 causes the neck 7 of the funnel 4 to be small. A region where the electron beam 8 does not reach, i.e., the non-light emitting portion 28, may occur on the phosphor screen 5 as shown in FIG. As the deflection yoke mounting area 12 is closer to the rectangle, as shown in FIG. 7, the horizontal axis vicinity 100 and the vertical axis vicinity 101 of the flat deflection yoke mounting area 12 by the atmospheric pressure load F are broken in the drawing. Distortion occurs in the direction shown by (103), so that the compressive stress (σX, σY) and the diagonal axis of the deflection yoke mounting region 12 on the outer and horizontal axes of the deflection yoke mounting region 12 Large tensile stress (σD) is generated in the It lowers the pressure resistance and impairs safety.

In view of this fact, it is known that the deflection yoke mounting area of the funnel 4 has a conical shape to close the distance between the deflection yoke and the electron beam to avoid the occurrence of the non-light emitting portion and the decrease in the internal pressure strength. It is known by Unexamined-Japanese-Patent No. 10-154472.

According to the Japanese Patent Laid-Open No. 58-225545, an appropriate groove is provided at a diagonal portion of the inner surface of the conical cone part funnel to prevent an electron beam from colliding with the inner surface of the funnel, thereby improving the deflection sensitivity, and the Japanese Patent Laid-Open No. 10-154472 The arc is a convex curve projecting the inner and outer contours in the tube axis direction in the cross section of the deflection yoke mounting region perpendicular to the tube axis, and satisfies the internal pressure strength due to the difference in thickness between the long and short sides.

In the above-described conventional pyramidal cathode ray tube, the cross section of the deflection yoke mounting area perpendicular to the tube axis has a straight inner and outer contour having two sides opposite to each other with a horizontal axis interposed therebetween, with the vertical axis interposed therebetween. It can be seen that the inner and outer contours having two opposite sides are defined by convex curves protruding from the tube axis direction.

However, according to Japanese Patent Laid-Open No. 58-225545 having a conventional cone-shaped cathode ray tube as described above, when the thickness difference between the long and short sides and the diagonal portions is excessively increased for the neck shadow (BSN), the maximum vacuum is in the funnel diagonal portion. Increasing the strength (tensile strength), there is a concern of firecrackers in the exhaust during the manufacturing process and the increase in deflection power due to the distance between the deflection coil and the electron beam passing area, and the diagonal and long and short sides and If the thickness ratio is sufficiently taken, there is a problem in that the stress of the neck shadow (BSN) and the short and short sides is weak.

In particular, according to the pyramidal cathode ray tube of Japanese Patent Laid-Open No. 10-15447, there is almost no margin of deflection yoke rotation during ITC work (adjustment of the deflection yoke when mounting the deflection yoke after the tube is made). Due to this has become the biggest difficulty of the productivity decrease.

Accordingly, an object of the present invention is to suppress the generation of neck shadow due to the difference in thickness between the long, short and diagonal portions of the tube axis and to sufficiently secure the internal pressure strength of the vacuum outer container while reducing the deflection power consumption and the ITC rotational margin. It is characterized by providing a cathode ray tube that can satisfy the securing.

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 cross-sectional view taken along the line II-II of FIG. 1,

FIG. 5 is a simplified cross-sectional view of a quarter side of FIG. 4 for explaining the inner and outer surfaces of the deflection yoke mounting region of FIG. 1;

6 is a front view of the color cathode ray tube,

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

8 to 11 is a configuration diagram showing an embodiment provided for the description of the cathode ray tube according to the present invention,

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

9 is a cross-sectional view taken along line III-III of FIG. 8,

10 is a cross-sectional view taken along line IV-IV of FIG. 8,

FIG. 11 is a simplified cross-sectional view of a quarter side of FIG. 10 for explaining the inner and outer surfaces of the deflection yoke mounting region of FIG. 8;

12 is a cross-sectional view taken along the tube axis of FIG. 8, showing the upper half with the tube axis as the center.

<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: arc

54: short side 55: long side

A 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, and a deflection yoke mounting area in an area extending from the end of the neck side toward the panel side,

When the outer contour of the deflection yoke mounting region having a point where the cross-sectional shape in the direction perpendicular to the tube axis is maximized in addition to the long axis and the short axis has an approximately rectangular shape,

Short side outer radius of curvature (Roy) near the deflection reference point (R / L: Reference Line) on the tube axis, which is 1/2 of the deflection angle of the cathode ray tube, is 110 mm or less and the short side inner surface radius of curvature in the direction perpendicular to the tube axis (Riy) and the ratio of the distance from the tube axis to the diagonal inner surface range from 0.110 to 0.180.

Preferably, the radius of curvature of the short side inner surface perpendicular to the tube axis is Riy, and the distance from the tube axis to the diagonal inner surface is Lid, wherein 0.127 ≦ Lid / Riy ≦ 0.172. At this time, when the ratio of the distance from the tube axis to the inner surface of the diagonal and the radius of curvature of the short side is less than 0.127, the internal pressure strength is improved, but the deflection sensitivity and the ITC rotational margin are lowered. When 0.172 or more, the deflection sensitivity and the ITC rotational margin are It improves, but the pressure resistance decreases.

A cathode ray tube according to another aspect of the present invention for achieving the above object is a panel having at least 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 outer contour of the deflection yoke mounting region having a point where the cross-sectional shape in the direction perpendicular to the tube axis is maximized in addition to the long axis and the short axis has an approximately rectangular shape,

The short-sided outer surface curvature radius (Roy) near the deflection reference point on the tube axis, which is 1/2 of the deflection angle of the cathode ray tube, is 110 mm or less, and the short-sided inner surface curvature radius (Riy) in the direction perpendicular to the tube axis is diagonal to the tube axis. The ratio of the distance to the inner surface is in the range of at least 0.110 to the maximum 0.180, and also the ratio of the distance from the tube axis to the diagonal outer surface and the diagonal outer curvature approximating the short side radius of curvature and long side radius of curvature. It is characterized by having a range of 0.20 to a maximum of 0.40.

Optionally, the short side inner curvature radius is Riy, the distance from the tube axis to the diagonal inner surface is Lid, the distance from the tube axis to the diagonal outer surface is Lod, and the long side, short axis long, short side surface curvature approximating the diagonal outer curvature rd In this case, 0.127 ≦ Lid / Riy ≦ 0.172 and 0.2035 ≦ rd / Lod ≦ 0.3443.

In this case, when the diagonal length of the inner surface of the funnel is fixed and the inner surface of the funnel is designed to approximate the trajectory of the electron beam, the outer surface of the funnel should be designed as close as possible to the deflection coil of the deflection yoke. If too large, it is vulnerable to strength, and if the internal and external curvature of the diagonal part is too small, the ITC rotation margin and deflection sensitivity become weak.

When the point on the tube axis where the angle at which the straight line connecting the point of the electron gun side on the screen of the tube axis and the diagonal end of the phosphor screen is 1/2 of the deflection angle of the cathode ray tube is set as the deflection reference line position, And the curvature inside and outside the diagonal of the deflection yoke mounting region at the cross-sectional side end diagonal to the tube axis at the deflection reference line position increases toward the inflection point.

As such, the ratio of the radius of curvature of the short side surface perpendicular to the tube axis and the distance from the tube axis to the diagonal inner surface perpendicular to the tube axis in the cross section of the deflection yoke mounting area forming the boundary between the neck and the funnel, the distance from the tube axis to the diagonal outer surface and the diagonal outer surface By optimizing the ratio to the curvature, it can be seen that the internal pressure stress applied to the funnel is minimized and the ITC rotational margin is secured.

As a result, while the internal pressure strength and the ITC rotational margin of the wide-angled vacuum exterior container are sufficiently secured, the deflection power is effectively reduced, so that the demand for high luminance and high frequency deflection is 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.

FIG. 8 is a perspective view of the color cathode ray tube of the present invention from behind, FIG. 9 is a cross-sectional view taken along line III-III of FIG. 8, and FIG. 10 is a cross-sectional view taken along line IV-IV of FIG. 8.

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 X and the vertical axis Y 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.

In particular, 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.

Specifically, the pyramidal deflection yoke mounting region 50 has a cross-sectional shape perpendicular to the tube axis Z in the vicinity of the connection portion with the neck 7 in the same shape as 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 Figs. 9 and 10, a substantially rectangular shape is matched to the shape of the effective portion 1 of the face panel 3.

As shown in Figs. 9 and 10, in the portion where the cross-sectional shape is formed almost rectangular, the cross-sectional outer contour of the deflection yoke mounting region 50 is horizontal axis X in the horizontal, vertical, and diagonal directions of the effective portion 1. , Having a vertical axis (Y) and a diagonal axis (D), a pair of arcs 51 of a radius of curvature Rox centered on the horizontal axis X and a radius of curvature centered on the vertical axis Y ( A pair of circular arcs 52 of Roy) and a circular arc 53 having a radius of curvature rd centered around the diagonal axis D are formed in a substantially rectangular shape.

As shown in Fig. 12, the deflection yoke 6 is mounted so that the short edge 59 on the side of the panel 3 is located near the 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.

9 and 10 show the shape of the deflection yoke mounting region.

In the cross section of the deflection yoke mounting region 50 of FIG. 9, the inner surface shape is a short side inflection point, a diagonal inflection point, and a long side with respect to the coordinates in the direction of the tube axis Z in the long axis X, the short axis Y, and the diagonal axis D. FIG. The position of the inflection point is formed at the same coordinates so that the inner lap in the major axis direction from the connecting portion 58 with the neck 7 to the short edge 59 of the deflection yoke, the inner sap in the minor axis direction and the diagonal axis direction Has an inner diameter of.

The outer surface shape of the deflection yoke mounting region 50 is larger than the outer diameter DAP and the inner diameter lap of the diagonal axis D from the connection portion with the neck 7 to the short edge 59 of the deflection yoke. It has an outer diameter LAP in the long major axis X direction and an outer diameter SAP in the minor axis Y direction longer than the inner diameter sap.

In particular, as shown in Figs. 11 and 12, the thickness of the deflection yoke mounting region 50 is a diagonal axis in the cross section of the tube axis Z, which corresponds to an approximately deflection center, commonly referred to as deflection reference line 57 (R / L). (D) The difference between the inner and outer diameters (lap, sap) and (LAP, SAP) in the horizontal axis (Y) and vertical axis (Y) directions.

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 mounting area on the side of the phosphor screen 5 is slightly smaller than the deflection reference line 57. Each part of 50 generate | occur | produces the maximum stress in the tension direction.

As shown in Figs. 9 and 10, the inner surface shape of the deflection yoke mounting region 50 is not a perfect plane but a substantially rectangular shape that slightly protrudes outward of the funnel 4, so that the inner and outer diameters (lap, sap), It has the thickness of long and short sides by the difference of (Lap, SAP). That is, in the cross section perpendicular to the tube axis Z of the deflection yoke mounting area 50, the inner contour of the deflection yoke mounting area 50 is not a perfect rectangle but a curved shape in which the sides smoothly protrude in the direction of the neck 7 sealing surface. It has internal diameters (lap, sap) in long and short directions.

The short side 54 of the inner contour of the deflection yoke mounting region 50 is formed as a pair of curves of the radius of curvature Rix centered on the horizontal axis X, as shown in FIGS. 10 and 11. , Each of the long sides 55 is formed as a pair of curves of a radius of curvature Riy centered on the vertical axis Y. FIG.

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 (X) and the vertical axis (Y) directions are lap and LAP. As the thickness in the horizontal direction and the thickness in the vertical direction, which are different from the (sap, SAP), are increased, each part is formed into an arcuate surface (53, 56) of almost rectangular shape on both the inner surface and the outer surface, and is deflected. The inner surface of the yoke mounting region 50 can be sufficiently close to the electron beam passing region, and the internal space can be secured.

In particular, in the case of wide-angle deflection (color cathode ray tube having a diagonal deflection angle of 95 degrees or more) having the shape of the pyramidal deflection yoke mounting region 50, the inner surface of the deflection coil is changed in accordance with the deflection angle when the deflection yoke 6 is adjusted. In the design, the deflection power is low and the deflection sensitivity is good because the electron beam is deflected in close proximity to the magnetic field of the electron beam and the deflection coil. Therefore, as shown in FIG. 12 such that the deflection coil has a constant distance from the inner surface of the deflection yoke mounting area 50, the curvature of the inner and outer surfaces of the deflection yoke increases from the deflection reference line 57 to the inflection point 60 so as to maintain a constant curved surface. It must be formed.

That is, the outer shape of the deflection yoke mounting region 50 in the present invention is horizontal, vertical and diagonal in the horizontal, vertical and diagonal directions on the phosphor screen 5 included in the panel, as shown in FIGS. 10 and 11. When having a diagonal axis D, the outer contour perpendicular to the tube axis Z has a substantially rectangular shape, where the vertical axis Y perpendicular to the tube axis Z near the deflection reference point 57 on the tube axis is When the outer surface radius of curvature Roy of each short side 51 of the image is about 110 mm or less, the radius of curvature Riy of the inner surface of each short side 54 on the vertical axis Y perpendicular to the tube axis Z and the tube axis Z It is characterized by forming the ratio with the distance (Lid) to each diagonal inner surface of each axis D to an appropriate range.

According to the experiment of the present inventors, as shown in FIGS. 10 and 11, the radius of curvature of the inner surface of the short side 54 on the vertical axis Y is Riy, and the distance from the tube axis Z to the diagonal inner surface is Lid and the tube axis Z. When the distance to the diagonal outer surface is Lod and the diagonal outer curvature is rd, the ratio of Lid and Riy and the ratio of Lod and rd in the vicinity of the deflection reference line 57 are 0.110 ≦ Lid / Riy ≦ 0.180 and 0.20 ≤ rd / Lod ≤ 0.40, wherein the distance (Lid, Lod) and short side curvature from the tube axis (Z) to the diagonal and the outer surface of the diagonal axis (D) When the ratio of the radius (Riy) or the diagonal outer curvature (rd) is in the range of 0.110 to 0.180 and 0.20 to 0.40, the appropriate tensile stress strength and deflection consumption power can be reduced, thereby reducing the deflection sensitivity. Improvement and ITC rotational margin did not appear to occur.

Especially, when the ratio of Lid and Riy is 0.127 ≤ Lid / Riy ≤0.172, and the ratio of Lod and rd is 0.2035 ≤ rd / Lod ≤ 0.3443, it is possible to secure optimal ITC rotational margin, deflection consumption power and tensile stress strength. Was satisfied.

In other words, when the above ratio is 0.127 and 0.2035 or less, the increase in the deflection power consumption and the ITC rotation margin are lowered, and when the 0.172 and 0.3443 or more, the internal pressure strength is lowered.

Therefore, only when the ratio between Lid and Riy and the ratio between Lod and rd is formed in the above-mentioned range, the pyramidal deflection yoke mounting region 50 should be formed to improve the air pressure strength and the ITC rotational margin and minimize the deflection power consumption. .

As a result, in the shape of the deflection yoke mounting region 50 according to the present invention, in the diagonal on the diagonal axis having the largest deflection angle, the outer surface curvature is increased to an appropriate range from the deflection baseline to the inflection point to the electron beam deflection trajectory. By preventing interference from occurring, the ITC rotational margin was secured, and the deflection consumption power and the atmospheric pressure strength could be improved.

On the other hand, as a comparative example, the conventional technique, that is, the diagonal portion of the deflection yoke mounting area of the funnel is partially cut to prevent collision with the electron beam, and also to prevent the explosion-proof and deflection power consumption. Contrary to that formed by increasing the thickness ratio of and, the present invention relates to the ratio of the radius of curvature of the short side surface perpendicular to the tube axis and the distance from the tube axis to the diagonal inner surface perpendicular to the tube axis in the cross section near the deflection center point of the pyramidal deflection yoke mounting area, or the tube axis. By optimizing the ratio of the distance from the diagonal to the outer surface of the diagonal and the diagonal surface curvature, the occurrence of ITC rotational margin deterioration affected by the diagonal portion of the deflection yoke mounting area of the funnel is minimized, and the internal pressure stress is minimized. It can be seen that the distance of the near.

As a result, according to the present invention, the outer contour of the pyramidal deflection yoke mounting region is almost approximated to the trajectory of the electron beam, and the inner contour is the internal pressure of the vacuum exterior container which is sufficiently widened with sufficient internal space according to the diagonal curvature ratio. While sufficient strength and ITC rotational margin are secured, there is an advantage that the deflection sensitivity is improved.

As described above, in the present embodiment, in the shape of the deflection yoke mounting region, the ratio of the radius of curvature of the short side to the tube axis and the direction perpendicular to the tube axis and the ratio of the distance from the tube axis to the diagonal inner surface, or the distance from the tube axis to the diagonal outer surface and the diagonal outer curvature, By optimizing the ratio, interference does not occur with respect to the electron beam deflection trajectory, and the distance between the electron beam and the magnetic field of the deflection yoke is optimized to secure an improvement in deflection sensitivity and pressure resistance.

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 and the inner and outer surfaces of the pyramidal deflection yoke mounting region are diagonal. By optimizing the length of the inner and outer surfaces, deflection consumption power is minimized, and the ITC rotational margin is secured and the pressure resistance is optimized.

Claims (6)

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 outer contour of the deflection yoke mounting region having a point where the cross-sectional shape in the direction perpendicular to the tube axis is maximized in addition to the long axis and the short axis has an approximately rectangular shape, The radius of curvature of the outer surface in the vicinity of the deflection reference point (R / L) on the tube axis, which is 1/2 of the deflection angle of the cathode ray tube, is 110 mm or less, and the short side inner surface radius of curvature in the direction perpendicular to the tube axis and the diagonal inner surface at the tube axis. Cathode ray tube, characterized in that the ratio to the distance to the range of at least 0.110 to a maximum of 0.180. The method of claim 1, A cathode ray tube, characterized in that the curvature radius of the short-sided inner surface of the short axis is Riy and the distance from the tube axis to the diagonal inner surface is Lid, and 0.127 ≦ Lid / Riy ≦ 0.172 near the deflection reference point (R / L). 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 outer contour of the deflection yoke mounting region having a point where the cross-sectional shape in the direction perpendicular to the tube axis is maximized in addition to the long axis and the short axis has an approximately rectangular shape, The radius of curvature of the outer surface in the vicinity of the deflection reference point (R / L) on the tube axis, which is 1/2 of the deflection angle of the cathode ray tube, is 110 mm or less, and a short inner corner radius of curvature in the direction perpendicular to the tube axis and a diagonal inner surface at the tube axis. The ratio of the distance to is in the range of at least 0.110 to at most 0.180, and also the ratio of the distance from the tube axis to the diagonal outer surface and the diagonal outer radius of curvature approximating the short side radius of curvature and the long side radius of curvature. Cathode ray tube, characterized in that it has a range from 0.20 to a maximum of 0.40. The method of claim 3, wherein And 0.127 ≦ Lid / Riy ≦ 0.172, wherein Riy is the short-sided inner surface curvature radius and the distance from the tube axis to the diagonal inner surface is Lid. The method of claim 3, wherein When the distance from the tube axis to the diagonal outer surface is Lod, and the short outer radius of curvature and the diagonal outer radius of curvature approximating the long outer radius of curvature are rd, the cathode is characterized by 0.2035 ≦ rd / Lod ≦ 0.3443. tube. The method of claim 3, wherein When the point on the tube axis at which the straight line connecting the point on the electron gun side on the screen of the diagonal screen of the phosphor screen and the tube axis is 1/2 of the deflection angle of the cathode ray tube is set to the deflection reference line position, A cathode ray tube, characterized in that the curvature of the outer surface of the deflection yoke mounting region at the cross-sectional side end that is diagonal to the tube axis at the deflection reference line position increases as the inflection point increases.