KR20000073384A - Cathode-ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided in which inner atmospheric pressure strength and beam strike neck margin are sufficiently secured and deflection consumption 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. If the deflection yoke accommodating area reaches at least the side end of the screen of the deflection yoke from the portion connected to the neck, the value obtained by dividing Td by Tv or Th is in the range of 0.5 to 0.85 when the axis ranging from the connection portion to the end of the deflection yoke accommodating area is divided by n, the thickness of the shorter side at each of the divided one, perpendicular to the axis, is Tv, the thickness of the longer side is Th and the thickness of diagonal direction is Td.

Description

Cathode Ray Tube

The present invention relates to a cathode ray tube such as a color receiving tube, a color monitor, and the like, in particular, by deflecting a deflection yoke mounting area of a vacuum exterior container without causing a neck shadow (BSN: Beam Strikes Neck) according to a wide angle. The present invention relates to a cathode ray tube capable of attaining sufficient internal pressure strength and improvement of deflection sensitivity.

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.

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, 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 (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 shown in Fig. 3, and 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 are shown. 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.

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 and outer diameters La and Sa in the major and minor axes and the outer diameters LA and SA 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.

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. 6, 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. 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 has a conical shape and the distance between the deflection yoke and the electron beam is close to avoid the occurrence of the neck shadow and the decrease in the air pressure strength. It is known by Unexamined-Japanese-Patent No. 10-154472.

According to the Japanese Laid-Open Patent Publication No. 58-225545, as shown in FIG. 7, an electron beam passing hole of the electron gun 9 is provided with appropriate grooves 12a to 12d at diagonal portions of the inner surface of the conical deflection yoke mounting region 12 ( The electron beam emitted from 8a to 8c) is prevented from colliding with the inner surface of the funnel, thereby improving the deflection sensitivity by eliminating the so-called BSN which causes shadows at the diagonal portions of the phosphor screen 5. The Japanese Laid-Open Patent Publication No. Hei 10-154472 is a pyramidal cathode ray tube, and has a straight inner and outer contour having two sides opposed to each other on a horizontal axis in a cross section of a deflection yoke mounting region perpendicular to the tube axis. In addition, the inner and outer contours having two sides opposite to each other on the vertical axis are convex curves protruding in the tube axis direction to satisfy the internal pressure strength due to the thickness difference between the long and short sides.

However, according to Japanese Patent Laid-Open No. 58-225545 having a conventional cone-shaped cathode ray tube as described above, the diagonal portion of the inner surface of the funnel was cut off to prevent the electron beam from colliding with the inner surface of the funnel, but it was stressed in the funnel due to the wide angle deflection. Concentration becomes particularly large in the deflection yoke mounting area, and it is difficult to design the inner surface of the funnel to be close to the tube axis in consideration of the neck shadow (BSN). There is a problem that the pressure resistance is lowered.

In addition, according to Japanese Patent Application Laid-Open No. 10-154472 having a pyramidal cathode ray tube, 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, and are diagonally long and short. Although the thickness difference satisfies the internal pressure strength, the maximum vacuum strength (tensile strength) increases in the funnel diagonal when the thickness difference between the long, short and diagonal parts is excessively increased for the BSN. And the deflection power consumption increases due to the distance between the deflection coil and the electron beam passing area, and the BSN and the long side when the thickness ratio between the diagonal and the long side is short enough to reduce the explosion and deflection power consumption. There is a problem that the stress on the short side becomes weak.

In particular, the difficulty of securing the neck shadow in the pyramidal cathode ray tube and the ITC work (adjustment of the deflection yoke when mounting the deflection yoke after the tube is made to optimize the screen) result in almost no margin of deflection yoke rotation. It is becoming the biggest difficulty of deterioration.

Therefore, the cathode ray tube can suppress the generation of the neck shadow due to the difference in thickness between the long, short and diagonal portions of the tube axis, and satisfies the reduction of deflection power and the deflection sensitivity while sufficiently securing the air pressure strength of the vacuum outer container. The funnel cone design of the is essential.

Accordingly, an object of the present invention is to provide a cathode ray tube for minimizing the air pressure stress applied to the funnel and improving the deflection sensitivity, which is divided into n equal parts of the deflection yoke mounting area on which the deflection yoke is mounted. It is characterized by optimizing the thickness ratio between the long, short axis direction and the diagonal axis direction perpendicular to the tube axis at a predetermined interval at each position.

It is another object of the present invention to provide a cathode ray tube for securing a margin of neck shadow and minimizing deflection consumption power, and the cathode ray tube has a proper ratio of the curvature ratio of the inner and outer curvatures of the deflection yoke mounting area to which the deflection yoke is mounted. Given as a range value, the magnetic field of the electron beam and the deflection coil as close as possible according to the deflection angle of the electron beam.

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,

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

7 is a configuration diagram of another embodiment provided in the description of a conventional cathode ray tube for suppressing occurrence of neck shadow;

8 to 10 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,

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

<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 deflection yoke mounting area is made from the connection portion with the neck to at least the screen side end of the deflection yoke, the tube axis from the connection portion with the neck to the end portion on which the deflection yoke is mounted is divided equally n at regular intervals and divided into When the thickness in the axial direction perpendicular to the tube axis at each position is Tv, the thickness in the major axis direction is Th, and the thickness in the diagonal direction is Td, the value of Td divided by Tv or Th is in the range of 0.5 to 0.85. It is characterized by having.

Optionally, the inner and outer curvature radii of the minor axis direction perpendicular to the tube axis are Riv, Rov, and the inner and outer curvature radii of the major axis direction perpendicular to the tube axis are Rih, Roh, the inner and outer surfaces of the major and minor axis directions, respectively. When the inner and outer curvatures of the diagonal portion approximating the radius of curvature are Rid and Rod, respectively, 0.35 ≦ Rid / Rod ≦ 0.67.

Preferably, the value obtained by dividing the inner surface curvature of the diagonal portion by the outer surface curvature of the diagonal portion has a range of values from 0.35 to 0.5.

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 connection portion with the neck to at least the screen side end of the deflection yoke, the tube axis from the connection portion with the neck to the end portion on which the deflection yoke is mounted is divided equally n at regular intervals and divided into When the thickness in the uniaxial direction perpendicular to the tube axis at each position is Tv, the thickness in the major axis direction is Th, and the thickness in the diagonal direction is Td, 0.5 ≦ Td / Tv ≦ 0.85 and 0.5 ≦ Td / Th ≦ 0.85. When the inner and outer curvature radii of the axial direction perpendicular to the tube axis are respectively Riv and Rov, and the inner and outer curvature radii of the major axis direction are Rih and Roh, respectively, the inner curvature of the diagonal portion approximated to Riv and Rih is Rov, The value divided by the outer curvature of the diagonal portion approximated by Roh is characterized by having a range of values from 0.35 to 0.67.

As such, the internal pressure stress applied to the funnel is optimized by optimizing the thickness in the axial direction perpendicular to the tube axis, the thickness in the major axis direction, the thickness in the diagonal direction and the curvature at the cross section of the deflection yoke mounting area forming the boundary between the neck and the funnel. It can be seen that it is minimized and the margin and deflection sensitivity of the BSN are improved.

As a result, the deflection power consumption is effectively reduced while the internal pressure pressure strength of the wide-angle vacuum exterior container is sufficiently secured, and the BSN margin is secured.

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 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 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 FIG. 10, a substantially rectangular shape is matched to the shape of the effective portion 1 of the face panel 3.

As shown in Fig. 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, 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.

In the cross section of the deflection yoke mounting region 50 of FIGS. 9 and 10, the inner surface shape has a 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 different positions so that the inner diameter Lap in the major axis direction and the inner diameter Sap in the minor axis direction extend from the connecting portion with the neck 7 to the short edge of the deflection yoke. It has an inner diameter in the diagonal direction.

The outer surface 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 of the deflection yoke, and a longer axis longer than the inner diameter Lap. It has an outer diameter LAP in the H) direction and an outer diameter SAP in the uniaxial V direction longer than the inner diameter Sap.

In particular, as shown in FIG. 10, the thicknesses (Tv, Th, Td) of the deflection yoke mounting region 50 are the diagonal axes D in the cross section of the tube axis Z, which generally corresponds to the approximately deflection center called the deflection reference line, It is represented by the difference between the inner and outer diameters (dap, DAP), (Lap, Sap), and (LAP, SAP) in the horizontal axis H and vertical axis V 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 angular deflection yoke mounting area 50, the deflection yoke mounting area 50 on the side of the phosphor screen 5 is slightly smaller than the deflection reference line. The maximum stress in the tensile direction occurs at each corner of.

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 projecting slightly in the direction of the tube axis Z, and thus the inner diameters (Lap, Sap), ( It has the thickness of long and short sides by the difference of LAP and SAP). 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 curve in which the sides smoothly protrude in the direction of the pipe axis Z. It has inner diameter (Lap, Sap) in uniaxial direction.

Then, 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 having a smooth top on the horizontal axis H, as shown in FIG. Each long side 55 is formed as a pair of curves of a radius of curvature Ri with a gentle top on the vertical axis V, and the diagonal side 56 has a radius of curvature centered around the diagonal axis D. It is formed of an arc of Rid).

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. The thickness in the horizontal direction, which is the difference between (Sap, SAP) and the thickness in the vertical direction, and the thickness in the diagonal direction, which is the difference between the inner and outer diameters (dap, DAP) in the diagonal direction (D), is increased. Each corner (corner) is formed of arcuate surfaces 53 and 56 having substantially rectangular shapes on both the inner surface and the outer surface thereof, so that the inner surface of the deflection yoke mounting region 5 can be sufficiently close to the electron beam passing region, and also the inner space. Can be secured.

In this cross section of the deflection yoke mounting region 50, as shown in FIG. 10, 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, diagonal direction. The thickness of Td, the inner and outer curvature radii in the short axis direction are Riv, Rov, and the inner and outer curvature radii in the major axis direction are Rih and Roh, respectively, and the inner and outer curvatures of the diagonal portion approximated to Riv and Rih are Rid, respectively. In the design of the deflection yoke mounting region 50, the diagonal length of the inner surface of the funnel 4 is almost fixed according to the electron beam trajectory, and the inner surface of the funnel is designed to approximate the trajectory of the electron beam. Since the design should be as close as possible to the deflection coil of the deflection yoke 6, the center portion of the deflection yoke mounting area is usually thickened and thinned near the diagonal portion. However, when the thickness difference (Td / Tv) in the center of the short axis direction becomes larger, the inner and outer curvature radii (Riv, Rov) in the short axis direction become smaller, which means that the outer surface of the funnel deflection yoke mounting region protrudes outward. And the distance between the deflection coil and the electron beam (8) means that the deflection consumption power is increased. In addition, when the Td / Tv decreases, the inner and outer curvature radii (Riv, Rov) in the short axis direction become large, which means that the outer surface of the deflection yoke mounting area of the funnel is relatively flattened and the distance between the deflection coil and the electron beam is close. This means that the power consumption of deflection is reduced.

However, if the ratio of the thickness in the uniaxial or long axis direction (Tv or Th) and the thickness in the diagonal direction (Td) is reduced, it is vulnerable to tensile stress.

According to the experiments of the present inventors, 0.5? Td / Tv? 0.85, and 0.5? Td when the thickness in the short axis direction perpendicular to the tube axis Z is Tv, the thickness in the major axis direction is Th, and the thickness in the diagonal direction is Td. When / Th ≤ 0.85, proper tensile stress strength and deflection consumption power could be reduced. In particular, when the thickness in the uniaxial direction perpendicular to the tube axis Z in the vicinity of the deflection reference position is Tv _L and the thickness in the diagonal direction is Td _L , the range is 0.3 ≦ Td _L / Tv _L ≦ 0.6, and the yoke portion and When the vertical thickness at the inflection point of the funnel portion is Tvt, the diagonal thickness is Tdt, and the horizontal thickness is Tht, and the thickness of the horizontal, vertical, and diagonal portions at the deflection reference position is Th _L , Tv _L , and Td _L. When Tdt / Tvt? Td _L / Tv _L , and Tdt / Tht? Td _L / Th _L , deflection sensitivity, air pressure strength, and good BSN margin were secured.

At the same time, the inner and outer curvatures of the diagonal axes D approximated to the inner and outer curvature radii Ri and Rov in the short axis V direction and the inner and outer curvature radii Ri and Roh in the long axis H direction are calculated. When Rid and Rod were 0.35 ≤ Rid / Rod ≤ 0.67, deflection sensitivity, internal pressure strength and good BSN were achieved.

When the value obtained by dividing the inner curvature Rid of the diagonal axis D by the outer curvature Rod has a value ranging from 0.35 to 0.5, the optimum BSN and the internal pressure strength of the funnel 4 Effective reduction of deflection power consumption was possible.

As a result, in the shape of the deflection yoke mounting region 50 in the present invention, the tube axis Z from the connection portion with the neck 7 to the end portion on which the deflection yoke 6 is mounted is divided equally n at regular intervals. At this time, the thickness ratio of the thickness in the short axis (V) direction or the thickness in the long axis (H) direction and the diagonal (D) direction perpendicular to the tube axis Z at each position is in the range of 0.5 to 0.85, and The ratio of the curvature of the inner and outer surfaces of the direction in the range of 0.35 to 0.67 or 0.35 to 0.5, and the ratio of the thickness in the uniaxial direction to the thickness in the diagonal direction near the deflection reference position is 0.3 to 0.6 By designing in the range of, the BSN margin on the inner surface of the funnel is secured according to the wide angle deflection, and the internal pressure strength of the funnel can be improved and the deflection power can be effectively reduced.

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. Unlike the formed by increasing the thickness ratio of the and, the present invention by designing the deflection yoke mounting area by optimizing the thickness and curvature of the long axis, the axial direction and the thickness of the diagonal direction perpendicular to the tube axis in the cross section of the pyramidal deflection yoke mounting area As a result, the generation of BSN and atmospheric pressure stress which are affected by the diagonal portion of the deflection yoke mounting area of the funnel are minimized, and the distance between the electron beam and the magnetic field of the deflection yoke is close, which reduces the power consumption of deflection. there was.

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 in which the deflection yoke is mounted, short axis, long axis and By optimizing the ratio of the thickness ratio in the diagonal direction and the inner and outer curvatures of the diagonal parts, the deflection sensitivity is not reduced and the margin of neck shadow (BSN) on the inner surface of the funnel is secured according to the wide angle deflection, and the internal pressure strength of the funnel. And an effective reduction of the deflection power consumption.

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 (7)

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 connection portion with the neck to at least the screen side end of the deflection yoke, the tube axis from the connection portion with the neck to the end portion on which the deflection yoke is mounted is divided equally n at regular intervals and divided into When Tv is the thickness in the axial direction perpendicular to the tube axis at each position, Tv is the thickness in the major axis direction, and Td is the diagonal direction, the value of Td divided by Tv and Th is in the range of 0.5 to 0.85. Cathode ray tube characterized in that it has. The method of claim 1, The radius of curvature of the inner and outer surfaces in the minor axis direction perpendicular to the tube axis is Riv, Rov, and the radius of curvature of the inner and outer surfaces in the major axis direction perpendicular to the tube axis are Rih, Roh, and the radius of curvature of the inner and outer surfaces in the major and minor directions, respectively. A cathode ray tube comprising 0.35 ≦ Rid / Rod ≦ 0.67 when the inner and outer curvatures of the diagonal portion to be approximated are Rid and Rod, respectively. The method of claim 2, And a value obtained by dividing the inner surface curvature of the diagonal portion by the outer surface curvature of the diagonal portion has a value ranging from 0.35 to 0.5. The method of claim 1, In the vicinity of the deflection reference position, the thickness in the short axis direction perpendicular to the tube axis is Tv._L, The thickness of the diagonal Td_L0.3 ≤ Td_L/TV_L A cathode ray tube, wherein ≤ 0.6. The method of claim 4, wherein The vertical thickness at the inflection point of the deflection yoke mounting area and the funnel portion is Tvt, the diagonal thickness is Tdt, the horizontal thickness is Tht, and the thickness of the horizontal and vertical diagonal portions at the deflection reference position is Th _L , Tv _L , Td when referred to _L, Tdt / Tvt _L ≥ Td / Tv _L, also the cathode ray tube, characterized in that Tdt / Tht _L ≥ Td / Th _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 deflection yoke mounting area is made from the connection portion with the neck to at least the screen side end of the deflection yoke, the tube axis from the connection portion with the neck to the end portion on which the deflection yoke is mounted is divided equally n at regular intervals and divided into When the thickness in the uniaxial direction perpendicular to the tube axis at each position is Tv, the thickness in the major axis direction is Th, and the thickness in the diagonal direction is Td, 0.5 ≦ Td / Tv ≦ 0.85 and 0.5 ≦ Td / Th ≦ 0.85. When the inner and outer curvature radii of the axial direction perpendicular to the tube axis are respectively Riv and Rov, and the inner and outer curvature radii of the major axis direction are Rih and Roh, respectively, the inner curvature of the diagonal portion approximated to Riv and Rih is Rov, A cathode ray tube, characterized in that the value divided by the outer curvature of the diagonal portion approximated by Roh has a value ranging from 0.35 to 0.67. The method of claim 6, A cathode ray tube comprising 0.35 ≦ Rid / Rod ≦ 0.5 when an inner surface curvature of the diagonal portion is Rid and an outer surface curvature of the diagonal portion is Rod.