KR20000073584A - Cathode-ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided in which the beam strike neck of a funnel is sufficiently secured and inner atmospheric pressure strength is improved. 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. The cross section of the deflection yoke accommodating area, which is perpendicular to the axis(Z) of the cathode ray tube, has the same circular shape as that of the neck at the portion connected with the neck but it has a rectangular shape corresponding to the effective ares of a face panel at its center portion and a portion connected to the fluorescent screen, wherein a ratio of thickness between the longitudinal part and the traverse part is 1.0 to 1.2.

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 and color monitors, and more particularly, by shaping the deflection yoke mounting area of a funnel in which a deflection yoke is mounted, a neck shadow according to wide angle deflection (BSN: Beam Strikes). The present invention relates to a cathode ray tube for achieving both a neck and an improvement in internal pressure strength.

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 perimeter of the neck to the outer perimeter 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, deflection yoke design → deflection yoke shape modeling → magnetic field calculation → electron beam trajectory calculation → funnel bulb stress analysis → The funnel must be designed based on the deflection yoke (DY) as in the order of redesigning the deflection yoke (DY shape modeling), which causes deflection sensitivity when the inner surface is almost fixed. And optimization of the outer surface design of the funnel to improve the pressure resistance considering the explosion-proof has been 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 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 a saddle type having a low leakage magnetic field and is a 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 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. 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 (H), a vertical axis (V), a diagonal axis (D), the center of the pair of arcs 20 and a vertical axis (V) of a radius (Roh) centered on the horizontal axis (H) A pair of arcs 21 of the excitation radius Rov and an arc 22 of a radius Rod 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 region 12, the inner surface shape is shorter than the inner diameter La and the short axis in the major axis direction from the connecting portion with the neck 7 to the short edge of the deflection yoke 6, as shown in FIG. 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 of the outer diameter DA and the major axis direction in the diagonal axis D direction across the screen side end, that is, the edge of the deflection yoke 6 from the connection with the neck 7. It has an outer diameter LA and the outer diameter SA of a short axis 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.

And the short side 24 of the inner contour of the deflection yoke mounting region 12 is formed as a convex curve having a top on the horizontal axis (H), each long side 25 is a convex curve having a top on the vertical axis (V). 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 diameters La and Sa and the 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.

The inner contour of the deflection yoke mounting area 12 and the thickness of the long and short sides in the direction perpendicular to the tube axis Z are set in accordance with the shape of the electron beam passing area 23 in the deflection yoke mounting area 12. It is.

Therefore, as described above, by forming the inner contour of the cross section of the deflection yoke mounting region 12 into a convex curve, the inner surface of the deflection yoke mounting region 12 passes through the electron beam, making a pincushion shape approximating the electron beam passing region 23. The area 23 is connected as much as possible. For example, the gap between the inner surface of the deflection yoke mounting region 12 and the electron beam passing region 23 is set to about 1 mm.

The deflection yoke mounting area 12 of the funnel 4 is formed into a curved shape in which the outer contour of the cross section is substantially rectangular in shape and each side of the inner contour is convex in the direction of the tube axis Z. The inner surface of the surface can be brought close to the electron beam passing region 23, whereby the deflection efficiency of the deflection yoke 6 can be improved and the deflection power can be reduced.

Thus, if the deflection yoke mounting area 12 to which the deflection yoke is mounted is formed in the shape of a pyramid, the diameter of the deflection yoke in the long axis (horizontal axis: H axis) and short axis (vertical axis: V axis) directions can be reduced, so that the deflection yoke (6) ), The deflection power can be reduced by efficiently deflecting the horizontal and vertical deflection coils close to the electron beam 8.

However, such a cathode ray tube reduces the diameter of the neck 7 or the outer diameter of the deflection yoke mounting area 12 of the funnel 4 to effectively reduce the deflection power, thereby making the deflection yoke mounting area 12 close to a rectangle. As shown in FIG. 5, the horizontal axis vicinity 100 and the vertical axis vicinity 101 of the flat deflection yoke mounting region 12 are distorted in the direction indicated by the broken line 103 in the drawing by the atmospheric pressure load F. As shown in FIG. Therefore, compressive stress (σH, σV) is generated at the horizontal and vertical axis outer surfaces of the deflection yoke mounting region 12, and large tensile stress (σD) is generated at the outer surface near the diagonal axis of the deflection yoke mounting region 12 and is vacuumed. The internal pressure of the outer container 10 is lowered in strength and the safety is impaired.

In view of this fact, it is known that the deflection yoke mounting area of the funnel 4 is a pyramidal shape, and closes the distance between the deflection yoke and the electron beam to avoid the occurrence of neck shadow and a decrease in the atmospheric pressure strength. Is known by.

According to Japanese Patent Laid-Open No. Hei 10-154472, in the cross section of the deflection yoke mounting region perpendicular to the tube axis, it has a straight inner and outer contour having two sides opposed to each other with a horizontal axis interposed therebetween, with a vertical axis interposed therebetween. The inner and outer contours with two opposite sides are convex curves protruding in the direction of the tube axis to satisfy the internal pressure strength and BSN due to the difference in thickness between the long, short and diagonal portions.

However, according to Japanese Patent Application Laid-Open No. 10-154472 having a conventional pyramidal cathode tube as described above, in the cross section of the deflection yoke mounting region perpendicular to the tube axis, the inner and outer contours are convex curves protruding in the tube axis direction. The internal pressure strength and BSN are satisfied by the difference in thickness of the long, short and diagonal sections. However, if the thickness difference is excessively given for the BSN, the maximum vacuum strength (tensile strength) is increased in the funnel diagonal. There is a problem of increase of the deflection power consumption due to the fear of firecrackers in the exhaust during the manufacturing process and the distance between the deflection coil and the electron beam passing area, and the thickness ratio between the diagonal part, the long side, and the short side part in order to reduce the explosion-proof and deflection consumption power. If enough take the BSN and the long side, there was a problem that the stress on the short side becomes weak.

In particular, in the case of wide-angle deflection having a pyramidal funnel yoke shape, the inner surface shape is pincushion type and the outer surface shape is linear, so that the strength of the long side portion is relatively weaker than that of the short side portion.

Therefore, it is necessary to design the deflection yoke mounting area of the funnel that satisfies the internal pressure strength of the neck shadow and the funnel without degrading the deflection sensitivity due to the difference in thickness between the long and short sides of the tube axis in the pyramidal cathode ray tube. This can be called.

Accordingly, it is an object of the present invention to provide a cathode ray tube that minimizes the atmospheric pressure stress applied to a funnel, the cathode ray tube having a deflection yoke mounting area according to the deflection angle of the electron beam with respect to the diagonal axis of the deflection yoke mounting area. The inner and outer surface contours of the inner and outer axes are characterized by improving the strength of the vulnerable part by varying the thickness of the long side and the short side, in particular, to have a constant thickness while going in the long axis and short axis direction.

Another object of the present invention is to provide a cathode ray tube which secures a margin of neck shadow and improves the internal pressure strength of the funnel, and the cathode ray tube has a deflection angle of the electron beam based on the diagonal axis of the deflection yoke mounting region. The inner and outer contours of the deflection yoke mounting region have a constant curvature in the long axis and short axis directions, and in particular, the thickness ratio is optimized according to the position of each length on each axis.

1 to 6 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,

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

6 to 10 is a configuration diagram showing an embodiment provided for the description of the cathode ray tube according to the present invention,

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

7 is a cross-sectional view taken along line III-III of FIG. 6,

8 is a cross-sectional view taken along line IV-IV of FIG. 6,

FIG. 9 is a simplified cross-sectional view of a quarter side of FIG. 7 for explaining the inner and outer surfaces of the deflection yoke mounting region of FIG. 6;

FIG. 10 is a cross-sectional view taken along line VI-VI of FIG. 6, showing the upper half with respect to the tube axis;

FIG. 11 is a cross-sectional view of another embodiment for describing the inner and outer surfaces of the deflection yoke mounting region of FIG. 6.

<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

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,

When the deflection yoke mounting area is made from the connecting portion with the neck to at least the screen side end of the deflection yoke, the contour of the inner surface of the deflection yoke mounting area is in the long axis and short axis direction with respect to the diagonal axis so as to be functionally related to the deflection angle. Having a pincushion shape projecting in the tube axis, and the outer contour has a rectangular shape with respect to the major axis and the minor axis, wherein the ratio of the thickness of the thickest portion between the minor axis direction and the major axis direction has a range of values from 1.0 to 1.2 It features.

Preferably, when dividing the length in the short axis and the long axis direction by n, the thickness of the long axis direction at each length position is Th and the thickness of the short axis direction is Tv, where 1.0 <Tv / Th? 1.2 It is characterized by being satisfied.

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,

When the deflection yoke mounting area is made from the connecting portion with the neck to at least the screen side end of the deflection yoke, the contour of the inner surface of the deflection yoke mounting area is in the long axis and short axis direction with respect to the diagonal axis so as to be functionally related to the deflection angle. When the shape protruding in the tube axis and the outer contour has a rectangular shape with respect to the major axis and the minor axis, the thickest part divided by the thinnest part on the same axis of either the minor axis or the major axis is obtained. Characterized in that it has a range of values from minimum 1.0 to maximum 1.5.

Optionally, the outer contour has a barrel shape that projects outward on at least one axis.

Optionally, when the outer curvature radius in the major axis direction is Roh and the outer curvature radius in the minor axis direction is Rov, 0.7 &lt; Rov / Roh &lt; 1.0 is satisfied.

As such, by optimizing the thickness ratio and curvature of the long, short, or long axis perpendicular to the tube axis in the cross section of the deflection yoke mounting area that forms the boundary between the neck and the funnel, the pressure stress applied to the funnel is minimized. It can be seen that the BSN margin is also secured.

As a result, the internal pressure strength of the funnel is improved and the BSN is secured in the wide-angle pyramidal cathode ray tube, so that there is no shadow in the diagonal portion of the screen.

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.

6 is a perspective view of the color cathode ray tube of the present invention from the back, FIG. 7 is a cross-sectional view taken along line III-III of FIG. 6, and FIG. 8 is a cross-sectional view taken along line IV-IV of FIG. 6.

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.

Further, the funnel 4 has a small diameter portion, so-called deflection yoke mounting region 50, which extends from the connection portion 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 connecting 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 part and near the edge part on the side of the phosphor screen 5, as shown in FIG. 8, it becomes a 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. 8, in the portion where the cross-sectional shape is formed into a substantially rectangular shape, the cross-sectional outer contour of the deflection yoke mounting region 50 is horizontal, vertical, and diagonal in the horizontal, vertical, and diagonal directions of the effective portion 1, and the vertical axis ( 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 pair of circular arcs 52 and a circular arc 53 having a radius of curvature Rod having a center in the vicinity of the diagonal axis D are formed in a substantially rectangular shape.

As shown in Fig. 10, the deflection yoke 6 is mounted such that the short edge 59 on the side of the panel 3 is positioned 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. 6 and 7, the inner surface shape is the long side inflection point 61 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. FIG. , The short side inflection point 62 and the diagonal inflection point 60 are formed in the same position so that the inner diameter Lap and the short axis direction in the long axis direction extend from the connecting portion 58 with the neck 7 to the short edge 59 of the deflection yoke. Has an inner diameter Sap and an inner diameter dap in a diagonal direction.

The outer surface shape of the deflection yoke mounting region 50 includes an outer diameter DAP in the diagonal axis D direction from the connecting portion 58 with the neck 7 to the short edge 59 of the deflection yoke, and an inner diameter ( Lap) has an outer diameter LAP in the long axis H direction longer than that of Lap) and an outer diameter SAP in the uniaxial V direction longer than the inner diameter Sap.

In particular, as shown in FIG. 9 and FIG. 10, the thicknesses Tv and Th of the deflection yoke mounting region 50 are generally diagonal axes in the cross section of the tube axis Z corresponding to a substantially deflection center called the deflection reference line 57. (D), the major axis (H) and the minor axis (V) in the direction of the difference between the internal diameter (Lap, Sap), (LAP, SAP).

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.

On the other hand, as shown in Figs. 7 and 8, the inner surface shape of the deflection yoke mounting region 50 is not a perfect plane but a pincushion shape projecting in the tube axis (Z) direction. , SAP) has the thickness of long and short sides. 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 is a convex curve in which each side protrudes in the direction of the tube axis Z. It has inner diameter (Lap, Sap) in the short axis direction.

The short side 54 of the inner contour of the deflection yoke mounting region 50 is formed as a convex curve having a top portion on the horizontal axis H, and each long side 55 is a convex curve having a top portion on the vertical axis V. FIG. It is formed.

Thus, when the long and short sides 55 and 54 of the inner contour of the deflection yoke mounting region 50 are convex curves, the inner and outer diameters (lap, LAP) in the horizontal axis (H), vertical axis (V) directions, Due to the increase in thickness, which is a difference from (Sap, SAP), each corner (corner) is formed on the inner and outer surfaces of the arc-shaped curved surface, that is, the arc (53, 56) surface, so that the deflection yoke mounting area 50 The inner surface of the can be sufficiently close to the electron beam passing area, and the internal space can be secured.

In the cross section of such a deflection yoke mounting region 50, as shown in FIG. 8, the thickness in the vertical axis (short axis) direction perpendicular to the tube axis Z is Tv, and the thickness in the horizontal axis (long axis) direction is Th, the short axis direction. In the design of the deflection yoke mounting region 50 in the design of the deflection yoke mounting region 50, the radius of curvature of the surface is Rov and the radius of curvature of the diagonal direction of the long axis is Roh. Since the diagonal length of the inner side of the funnel (4) is almost fixed and the inner side of the funnel should be designed to approximate the trajectory of the electron beam, the outer side of the funnel should be designed as close as possible to the deflection coil of the deflection yoke (6). The center is thicker and thinner near the diagonal.

However, when the thickness difference in the short axis direction and the long axis direction become larger, the outer curvature radii Roh and Rov in the long and short directions become smaller, which means that the outer surface of the deflection yoke mounting area of the funnel protrudes outward to improve the internal pressure strength. As the distance between the deflection coil and the electron beam 8 increases, the deflection power consumption increases, and the BSN decreases. In addition, when the thickness difference in the short axis direction and the long axis direction become smaller, the outer curvature radii Roh and Rov in the long and short directions become larger, which means that the outer surface of the funnel's deflection yoke mounting area is relatively flattened. Since the distance to the electron beam is close, the deflection power consumption is reduced and the BSN is improved, but it is disadvantageous to the tensile stress. In particular, when the difference between the thickness in the major axis direction and the thickness in the minor axis direction is small, the tensile stress is severely generated in the major axis direction.

Therefore, according to the experiment of the present inventors, the tube axis (Z) while going in the direction of the long axis (H) and the short axis (V) with respect to the diagonal axis (D) so that the inner surface contour of the deflection yoke mounting region 50 becomes a functional relationship with the deflection angle. In the case of having a pincushion shape protruding from the shape, the outer contour has a substantially rectangular shape with respect to the major axis (H) and the minor axis (V), the thickness Tv in the minor axis direction perpendicular to the tube axis (Z) is the most thick Tvc, When the thickest portion Th in the major axis direction is called Thc, an appropriate tensile stress can be improved when 1.0 <Tvc / Thc ≤ 1.2. In other words, the pressure resistance was satisfied by making the thickness of the long side appropriately thicker than the thickness of the short side. Here, the deflection yoke mounting region 50 having a ratio of the thickness Tvc in the short axis V direction and the thickness Thc in the long axis H direction is from the deflection reference line 57 to the inflection point 60 with respect to the tube axis. It is characterized by one.

Further, in the cross section of the deflection yoke mounting region 50 having the inner and outer surface shapes as described above, the major axis H is left in the state in which the thickness Tv in the direction of the minor axis V perpendicular to the tube axis Z is left as it is. The barometric strength and BSN could be improved even with the obesity of thickness in the direction.

That is, when Thc is the thickest part in the long axis direction (Thc), Thc1 is the thinnest part in the thickness (Th), Roh is the outer curvature radius in the long axis direction, and Rov is the outer curvature radius in the short axis direction, 1.0 <Thc Proper tensile stress and good BSN securement were realized when / Thc1? 1.5 and "0.7 <Rov / Roh? 1.0".

In another embodiment of the present invention, in the cross section of the deflection yoke mounting area, as illustrated in FIG. 11, the outer surface contour of the deflection yoke mounting area is barrel-shaped with respect to at least one axis, and completely with respect to the other axis. To form a rectangle.

In other words, the outer surface of the long side having two sides facing each other with the long axis H is formed into a barrel shape projecting outward with respect to the tube axis, and the outer side of the short side having two sides facing the side with the short axis V is placed in the tube axis. By satisfying the above-described conditions of the minimum thickness Thc1 and the maximum thickness Thc in the long axis direction in a straight line with respect to the above conditions, securing the atmospheric pressure strength and good BSN is realized.

As a result, as an example of the two experiments in the present invention, the long axis H and the short axis (based on the diagonal axis D) are formed so that the inner surface contour of the deflection yoke mounting region 50 becomes a function of the deflection angle. It has a shape protruding in the tube axis (Z) while going in the V) direction, the outer contour has a substantially rectangular shape with respect to the long axis and short axis, the thickness of the thickest portion in the short axis (V) direction and the long axis (H) direction The ratio of the thickness of the thickest part is in the range of at least 1.0 to maximum 1.2. As another example, the ratio of the thickness of the thickest part in the major axis direction to the thickness of the thinnest part is in the range of at least 1.0 and up to 1.5. By designing the ratio between the outer curvature radius in the long axis direction and the outer curvature radius in the minor axis in the range of 0.7 to 1.5, the two experiments ensure the BSN margin of the funnel's inner surface due to wide-angle deflection. The strength of the pressure within the funnel improvement was possible.

On the other hand, as a comparative example, unlike the conventional technique, that is, in the cross section of the deflection yoke mounting region perpendicular to the tube axis, the inner and outer contours are formed as convex curves protruding in the tube axis direction for internal pressure strength and BSN. The present invention optimizes the deflection yoke by optimizing the major axis perpendicular to the tube axis in the cross section of the pyramidal deflection yoke mounting area, the ratio of the thickness of the thin axis to the minor axis, and the ratio and the curvature of the thickness of the thickest and thinnest parts on the same axis. By designing the mounting area, this result minimizes the generation of BSN which is affected by the diagonal of the deflection yoke mounting area and the internal pressure stress which is affected by the long axis, and the distance between the electron beam and the magnetic field of the deflection yoke is close. Thus, the deflection power consumption was reduced.

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 an angular deflection yoke mounting area on which the deflection yoke is mounted, the short axis and the long axis direction of the pyramidal deflection yoke mounting area By optimizing the thickness ratio and the curvature ratio and curvature on one axis, the deflection sensitivity does not decrease and the internal shadow shadow (BSN) of the funnel and the pressure resistance of the funnel are improved according to the wide angle deflection.

In addition, the inner contour of the pyramidal deflection yoke mounting region protrudes in the tube axis and as close to the electron beam as possible, thereby increasing the design freedom of the funnel appearance.

Claims (10)

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 deflection yoke mounting area is made from the connecting portion with the neck to at least the screen side end of the deflection yoke, the contour of the inner surface of the deflection yoke mounting area is in the long axis and short axis direction with respect to the diagonal axis so as to be functionally related to the deflection angle. When the shape protrudes in the tube axis and the outer contour has an approximately rectangular shape with respect to the long axis and the short axis, And the ratio of the thickness of the thickest portion between the short axis direction and the long axis direction has a value ranging from at least 1.0 to at most 1.2. The method of claim 1, A value obtained by dividing the thickness of the thickest portion in the short axis direction by the thickness of the thickest portion in the major axis direction satisfies the above condition. The method of claim 2, When dividing the length in the short axis and the long axis direction by n, the thickness in the long axis direction at each length position is Th, and the thickness in the short axis direction is Tv, which satisfies 1.0 <Tv / Th ≦ 1.2. Cathode ray tube. The method of claim 3, wherein And the deflection yoke mounting region having the thickness ratio in the short axis direction and the thickness in the long axis direction is in a range from the deflection reference line to the inflection point with respect to the tube axis. 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 deflection yoke mounting area is made from the connecting portion with the neck to at least the screen side end of the deflection yoke, the contour of the inner surface of the deflection yoke mounting area is in the long axis and short axis direction with respect to the diagonal axis so as to be functionally related to the deflection angle. When the protruding shape in the tube axis, and the outer contour has a rectangular shape with respect to the long axis and short axis, The cathode ray tube, characterized in that the value obtained by dividing the thickest part by the thinnest part on the same axis in either the short axis direction or the long axis direction has a value ranging from 1.0 to 1.5. The method of claim 5, The one coaxial is a cathode ray tube, characterized in that the long axis direction perpendicular to the tube axis. The method of claim 6, And a deflection yoke mounting region having a thickness ratio in the major axis direction and a thickness in the major axis direction is in a range from a deflection reference line to an inflection point with respect to the tube axis. The method of claim 5, And 0.7 &lt; Rov / Roh &lt; 1.0 when the outer curvature radius in the long axis direction is Roh and the outer curvature radius in the short axis direction is Rov. The method of claim 5, And the outer surface contour has a barrel shape projecting outward on at least one axis. The method of claim 9, And a shaft having a barrel shape with respect to the one axis is in a long axis direction perpendicular to the tube axis.