CN1822301A - Display screens for thin cathode ray tubes - Google Patents

Abstract

Disclosed herein is a panel of a slim cathode ray tube constructed such that the deflection angle of an electron beam is 110 degrees or more. The slim cathode ray tube includes a tube part constituted by joining the panel and a funnel with each other. The panel includes a face part, a side wall disposed around the face part such that the side wall is bent toward the funnel, and a seal edge formed at the side wall, the panel being joined with the funnel at the seal edge. On the assumption that the thickness of the center of the face part is Tc, the thickness of the long side of the seal edge is Tx, the thickness of the short side of the seal edge is Ty, and the thickness of the diagonal part of the seal edge is Td, the panel is constructed such that the following inequalities are satisfied: 0.8<=Tc/Ty<=Tc/Tx<=1.0<=Tc/Td and Td<Tx<Ty, and the side wall has an outer skirt angle of 0.5 to 1.5 degrees.

Description

Display screens for thin cathode ray tubes

technical field

The present invention relates to a thin type cathode ray tube, and more particularly, the present invention relates to a display screen for a color cathode ray tube, wherein the center thickness of the display screen and the thickness of the sealing edge can be appropriately set, and can be appropriately set The outer edge corner of the display screen, so as to minimize the stress concentration caused by the increase of the deflection angle, ensure sufficient rigidity, improve the anti-riot characteristics and plasticity of the display screen, and effectively prevent the reinforcement belt from slipping.

Background technique

In general, a cathode ray tube is a device for converting electrical signals into electron beams and scanning the electron beams across a phosphor screen to display images on a display screen.

FIG. 1 is a partially cutaway side view showing a conventional cathode ray tube, and FIG. 2 is a sectional view showing a display screen constituting the conventional cathode ray tube.

As shown in FIGS. 1 and 2, a conventional cathode ray tube includes a display panel 1 and a tapered portion 2 which are connected together to form a tube portion 10. As shown in FIG.

Inside the display screen 1, a shadow mask 3 is provided, and the frame 4 supports the shadow mask 3 such that the shadow mask 3 is nearly parallel to the display screen 1. The frame 4 is fixed on the display screen 1 by the spring 5 . An inner shield 6 is provided in the tapered portion 2 for shielding the external earth's magnetic field, so as to prevent the external earth's magnetic field from bending the path of the electron beam.

An electron gun 7 is provided at the rear of the tapered portion 2 for generating electron beams. A deflection yoke 8 is mounted outside the neck of the tapered portion 2 for deflecting the electron beams by about 110 degrees or less.

In the conventional cathode ray tube having the above structure, the deflection yoke 8 deflects the electron beam emitted from the electron gun 7 upward, downward, leftward, and rightward, and then transmits the electron beam to the display screen 1 . Specifically, the deflected electron beams pass through the through holes of the shadow mask 3, and then, are transmitted to the phosphor screen 9 sprayed on the inner surface of the display screen 1. As shown in FIG. At this time, the energy of the electron beams causes the fluorescent screen 9 to emit light. Therefore, the image is reproduced such that the user can see the image reproduced through the display screen 1 .

Simultaneously, the display screen 1 and the tapered portion 2 are connected to each other at the sealing edges 1x, 1y, and 1d of the display screen 1 by a frit sealing process, and the electron gun 7 is assembled to the tapered portion 2 by a subsequent packaging process. Later, a vacuum is created in the tube section 10 using a pumping process. In this way, a cathode ray tube is manufactured.

When the tube portion 10 is in a vacuum state, considerable tensile and compressive stresses are applied to the display screen 2 and the tapered portion 2 .

In particular, when the overall length of the tube part 10 is reduced, the inner volume of the tube part 10 is also correspondingly reduced. Therefore, the stress applied to the pipe portion 10 is increased. Recently, the neck portion of the tapered portion 2 is formed into a rectangular shape to reduce the current required to deflect the electron beams and thus reduce the power consumption of the deflection yoke 8 . In this case, however, the stress applied to the pipe portion 10 is further increased.

Referring to FIG. 2, CFT represents the thickness of the center of the display screen 1, and SET represents the thickness of the sealed edge of the display screen 1 where the display screen 1 and the tapered portion 2 are joined together. Specifically, SET(Tx) represents the thickness of the sealed edge of the display screen 1 located at the long side portion, SET(Ty) represents the thickness of the sealed edge of the display screen 1 located at the short side portion, and SET(Td) represents the thickness of the sealed edge located at the opposite side of the display screen 1. The thickness of the sealing edge of the display screen 1 at the corner portion.

As the CFT of the display panel 1 decreases, the stress of the tube portion 10 concentrates on the display panel 1 . On the contrary, when the SET(Tx, Ty, Td) of the display panel 1 is decreased, the stress is concentrated on the sealing edge of the display panel 1, thus, the probability of breaking the tube portion 10 is increased.

Therefore, the settings of CFT and SET are very important for properly distributing the stress of the display screen 1 . Specifically, when CFT and SET are large, stress is prevented from being concentrated on a specific portion on the display screen 1, as shown in FIG. 3 . However, the overall volume of the display screen 1 is reduced, and therefore, the manufacturing cost of the display screen 1 is also increased.

In summary, setting the CFT and SET of the display 1 is the process of finding the optimum point of the relationship between stress and cost.

In the conventional cathode ray tube having a deflection structure of 110 degrees as described above, the length of the tapered portion 2 is longer than that of the display screen 1, and the neck portion of the tapered portion 2 is formed in a smoothly curved shape. Therefore, stress is not concentrated on the tapered portion 2, and thus, there is no need to distribute stress.

For this reason, the display screen 1 is designed such that, as shown in FIG. 4, the ratio of CFT to SET (Tx, Ty, Td) of the display screen 1 is the same over all areas. When changing the ratio of CFT to SET(Tx, Ty, Td) of the display panel 1, there is no difference in stress, therefore, the cost reduction is not significant. Specifically, depending on the size and deflection angle of the tube portion 10, the ratio of CFT to SET varies slightly.

However, the deflection structure of a recently developed thin cathode ray tube has a deflection angle of 110 degrees or more. In addition, the overall length of the thin cathode ray tube is reduced, and therefore, the internal volume of the thin cathode ray tube is reduced. As a result, further stress is applied to the display screen and the tapered portion. Therefore, it is required to properly set the ratio of CFT to SET of the display screen 1 to effectively prevent excessive stress from being applied to the display screen and the tapered part.

Meanwhile, when the tube portion 10 is in a vacuum state, considerable tensile and compressive stresses are applied to the display screen 1 and the tapered portion 2 . Referring to FIGS. 2 and 5, when the tube portion 10 is in a vacuum state, the stress of the external impact of the display screen 1 is transmitted to the tapered portion 2 through the sealing edges 1x, 1y, and 1d at the ends of the side walls of the display screen 1. Therefore, the stress on the display screen 1 can be slightly reduced.

Therefore, both the thickness SET and the shape of the side wall 1s of the display panel 1, that is, the sealing edges 1x, 1y, 1d of the display panel 1 have a significant influence on the reliability of the cathode ray tube.

In particular, the anti-riot property against external impact and spark phenomenon has a close relationship with the thickness and shape of the sealing edge of the display panel 1, and when the tube portion 10 is passed through a heating furnace in the manufacture of a cathode ray tube to utilize a glass frit welding method, This sparking phenomenon occurs when the display screen 1 and the tapered portion 2 are connected to each other. Furthermore, as the outer edge angles of the side walls increase, the manufacturing throughput of the tube 10 is reduced.

On the conventional display screen 1, the outer edge angle S is approximately 3 to 4 degrees. In the long side portion 1x, the outer edge angle S is the largest. In the short side portion 1y, the outer edge angle S is smallest. The outer edge angle S at the diagonal portion 1d is smaller than the outer edge angle S at the long side portion 1x and larger than the outer edge angle S at the short side portion 1y.

On the display screen 1 of the cathode ray tube as described above, the outer edge angle S of the display screen 1 is 3 degrees or more, and the outer edge angle S is set so that the outer edge angle S is the largest at the long side portion 1x, The outer edge angle S is smallest at the short side portion 1y, and the outer edge angle S at the diagonal portion 1d is smaller than that at the long side portion 1x and larger than that at the short side portion 1y. Therefore, the thickness SET of the long side portion 1x is smaller than the thickness SET of the short side portion 1y, and thus, the anti-riot characteristic is lowered.

Furthermore, as shown in FIG. 1 , a reinforcing tape 11 is wound around the side wall 1 s to distribute a large stress applied to the display screen 1 . However, as described above, when the outer edge angle S of the display screen 1 is large, the reinforcing tape 11 tends to slip. Therefore, it is difficult to perform the reinforcement tape winding process, and it is difficult to effectively distribute the stress applied to the pipe portion 10 when the reinforcement tape 11 slips.

Contents of the invention

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to provide a display screen for a thin cathode ray tube that can uniformly distribute the tapered portion caused by wide-angle deflection of 110 degrees or more. The overall length of the tube is shortened to concentrate the stress on the tapered portion, so that sufficient rigidity can be maintained on a thin cathode ray tube.

Another object of the present invention is to provide a display screen for a thin cathode ray tube, wherein by appropriately setting the ratio of the CFT of the display screen to the long side portion, the short side portion and the diagonal portion of the sealed edge of the display screen, The thickness of the sealing edge of the display is optimized to prevent stress concentrations due to increased deflection angles, thereby preventing damage to the display during manufacture of the tube part, thus fulfilling the principle of inward explosion.

Still another object of the present invention is to provide a display screen for a thin cathode ray tube, wherein the outer edge angle of the side wall of the display screen is set at 0.5 to 1.5 degrees, thereby improving the anti-riot characteristic and plasticity of the display screen, and It can effectively prevent the reinforcement belt from slipping.

According to an aspect of the present invention, the above and other objects can be achieved by providing a display screen for a thin cathode ray tube constructed such that the deflection angle of electron beams is 110 degrees or more, the A thin cathode ray tube comprising a tube portion formed by joining a display screen and a tapered portion to each other, wherein the display screen includes: a screen portion on which an image is displayed; side walls arranged around the screen portion so that the side walls face toward the cone and a sealing edge formed on the side wall, on which the display screen is joined to the tapered portion, assuming that the thickness at the center of the screen portion is Tc, and the thickness of the long side of the sealing edge is Tx, The thickness of the short side of the sealing edge is Ty, and the thickness of the diagonal part of the sealing edge is Td, then the display screen is constructed in such a way that the following inequality is satisfied: 0.8≤Tc/Ty≤Tc/Tx≤1.0≤Tc/Td, And Td<Tx<Ty, and the sidewall has an outer edge angle of 0.5 to 1.5 degrees.

The display screen is preferably constructed such that the following inequalities are satisfied: 0.75<Td/Tx<1.0 and 0.74<Td/Ty<1.0.

The total length of the tube section is preferably 350 mm or less, and the diagonal dimension of the display screen is approximately 700 to 800 mm.

It is preferable to form the display screen approximately in a rectangular configuration, and to set the outer edge angles so as to satisfy the following inequality: outer edge angles at short sides>outer edge angles at diagonal parts>outer edge angles at long sides.

According to another aspect of the present invention, there is provided a display screen of a thin cathode ray tube configured such that the deflection angle of the electron beam is 110 degrees or more, the thin cathode ray tube comprising A tube portion in which a display screen and a tapered portion are joined to each other, wherein the display screen includes: a screen portion on which an image is displayed; a sealing edge arranged around the screen portion such that the sealing edge bends toward the tapered portion, where the sealing On the edge, the display screen is joined with the tapered part, and assuming that the thickness of the center of the screen part is Tc, the thickness of the long side of the sealing edge is Tx, the thickness of the short side of the sealing edge is Ty, and the diagonal of the sealing edge The thickness of the part is Td, and the display panel is constructed so that the following inequality is satisfied: 0.8≤Tc/Ty≤Tc/Tx≤1.0≤Tc/Td.

The display screen is preferably constructed such that one of the following inequalities is satisfied: Td<Tx<Ty, Td<Tx≦Ty and Td≦Tx<Ty.

According to another aspect of the present invention, there is provided a display screen of a thin cathode ray tube configured such that the deflection angle of the electron beam is 110 degrees or more, the thin cathode ray tube comprising A tube portion formed by joining the display screen and the tapered portion to each other, wherein the display screen includes: a sealing edge disposed around such that the sealing edge bends toward the tapered portion, on which sealing edge the display screen and the tapered portion are joined in Together, and assuming that the thickness of the long side of the sealing edge is Tx, the thickness of the short side of the sealing edge is Ty, and the thickness of the diagonal portion of the sealing edge is Td, the display screen is constructed so that the following inequality is satisfied: Td< Tx<Ty.

The display screen is preferably constructed such that the following inequalities are satisfied: 0.75<Td/Tx<1.0 and 0.74<Td/Ty<1.0.

According to still another aspect of the present invention, there is provided a display screen of a thin cathode ray tube configured such that the deflection angle of the electron beam is 110 degrees or more, the thin cathode ray tube comprising The display screen and the tapered portion are joined together to form a tube portion, wherein the display screen includes a side wall arranged around such that the side wall is curved toward the tapered portion, and the side wall has an outer edge angle of 0.5 to 1.5 degrees.

It is preferable to form the display screen approximately in a rectangular configuration, and to set the outer edge angles so as to satisfy the following inequality: outer edge angles at short sides>outer edge angles at diagonal parts>outer edge angles at long sides.

According to the present invention, the thickness of the central position of the display screen and the thickness of the long side, short side and diagonal part of the sealing edge are properly set to evenly distribute the stress locally concentrated on the tube part due to the increase of the deflection angle. Therefore, even if the total length of the pipe portion is shortened, the present invention has the effect of improving anti-riot characteristics and securing sufficient rigidity.

Furthermore, the thickness of the sealing edge of the display screen is appropriately set according to the present invention. Thus, during the production of the tube part, damage to the display screen can be prevented and the rules of inward explosion are fulfilled.

In addition, the outer edge angle of the display screen is set at 0.5 to 1.5 degrees, and the outer edge angle of the display screen is set so as to satisfy the following inequality: outer edge angle at the short side>outer edge angle at the diagonal portion>at The outer edge corner of the long side. Thus, the vacuum force is evenly distributed. Therefore, the anti-riot characteristic and the plasticity of the display screen can be improved, and the reinforcement tape can be effectively prevented from slipping.

Description of drawings

According to the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and other advantages of the present invention can be more clearly understood, wherein:

FIG. 1 is a partially cutaway side view showing a conventional cathode ray tube;

2 is a sectional view showing a display screen constituting a conventional cathode ray tube;

FIG. 3 is a graph showing stress and cost as a function of the CFT/SET ratio of a general display screen;

4 is a rear view showing the thickness of a sealed edge of a display screen of a conventional cathode ray tube;

FIG. 5 is a detailed view showing an outer edge corner of a display screen of a conventional cathode ray tube;

6 is a schematic side view showing a cathode ray tube to which a display screen according to the present invention is applied;

7 is a schematic view showing the thickness ratio of the display screen of the thin cathode ray tube according to the present invention;

8 is a rear view showing the thickness of the sealing edge of the display screen of the thin cathode ray tube according to the present invention; and

FIG. 9 is a detailed view showing the outer edge corners of the display screen of the thin cathode ray tube according to the present invention.

Detailed ways

Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a schematic side view showing a cathode ray tube to which a display screen according to the present invention is applied.

The display screen according to the present invention is preferably applied to a thin cathode ray tube having an off-angle of 110 degrees or more.

The thin cathode ray tube shown in FIG. 6 has a deflection angle of 110 degrees or more. In addition, the thin cathode ray tube includes a tube portion 40 whose total length is 350 mm or less. The total length of the tube portion 40 formed by interconnecting the display panel 20 and the tapered portion 30 is smaller than the total length of the tube portion P of the conventional cathode ray tube shown by dotted lines in FIG. 6 .

Although the size of the display screen 20 is not reduced, the size of the tapered portion 30 of the thin cathode ray tube is remarkably reduced compared with the size of the tapered portion of the conventional cathode ray tube. Therefore, the stress widely distributed on the tapered portion concentrates on the neck portion 32 of the tapered portion 30, and therefore, the explosion-proof characteristics and rigidity of the thin cathode ray tube may decrease.

For this reason, according to the present invention, the shape of the display screen 20 is changed to distribute on the display screen 20 the stress concentrated on the neck portion 32 of the tapered portion due to the reduction in the overall length of the tube portion 40 to uniformly distribute the stress on the tapered portion. The stress applied by the pipe portion 40, therefore, the pipe portion 40 has a sufficiently strong rigidity.

In addition, according to the present invention, the outer edge angles of the side walls of the display screen 20 are changed to improve the anti-explosion characteristics and to prevent slippage of the reinforcing tape wound around the side walls of the display screen 20 .

7 is a schematic view showing the thickness ratio of the display panel of the thin cathode ray tube according to the present invention, and FIG. 8 is a rear view showing the thickness of the sealing edge of the display panel of the thin cathode ray tube according to the present invention.

The display screen 20 includes a screen portion 21 on which an image is displayed. Around the screen portion 21 is provided a side wall 23 curved toward the tapered portion 30 . On the side wall 23 are formed sealing edges 25s, 25y and 25d through which the display screen and the tapered portion 30 are bonded together.

The diagonal size of the display screen 20 is approximately 700 to 800 mm, and therefore, the display screen can be properly applied to a thin cathode ray tube.

The screen portion 21 is approximately formed in a rectangular structure. The thickness of the screen portion 21 is smallest at its center.

Since the screen portion 21 is approximately formed in a rectangular structure, horizontal long sides 25x, vertical short sides 25y, and diagonal portions 25d forming corners of the display screen 20 constitute side walls 23 and sealing edges 25x, 25y, and 25d.

Here, it is assumed that the thickness (CFT) of the central position of the screen portion 21 is Tc, the thickness of the long side 25x of the sealed edge is Tx, the thickness of the short side 25y of the sealed edge is Ty, and the thickness of the diagonal portion 25d of the sealed edge is Tx. is Td, the display panel 20 is constructed so as to satisfy the following inequality: 0.8≤Tc/Ty≤Tc/Tx≤1.0≤Tc/Td, thereby uniformly distributing the stress.

As the CFT decreases, stress concentrates on the panel portion 21, and therefore, the rigidity of the panel portion 21 decreases. So, by doing blast tests, drop tests, and x-ray tests, you get bad results.

The side wall 23 is the part where the tapered portion 30 connects to the screen portion. When the thickness of the side wall 23 is too small, the connection force between the side wall 23 and the tapered portion 30 decreases. Therefore, stress concentrates on the connecting body between the display screen 20 and the tapered portion 30, thus reducing the rigidity of the thin cathode ray tube.

Therefore, the display panel 20 is constructed such that the thickness Tx of the long side 25x and the thickness Ty of the short side 25y are equal to or greater than CFT, and the thickness of the diagonal portion 25d is smaller than CFT.

However, when the thickness Tx of the long side 25x and the thickness Ty of the short side 25y are excessively increased, stress is concentrated on the panel portion 21 . Therefore, in order to uniformly distribute the stress concentrated on the panel portion 21, it is preferable to construct the display panel 20 such that Tc/Ty≥0.8, or Tc/Ty≥0.8. In addition, it is also possible to construct the display screen 20 such that the long side 25x and the short side 25y have the same thickness. However, in this case, the stress concentrated on the long side 25x is larger than the stress concentrated on the short side 25y. Therefore, in order to uniformly distribute the stress concentrated on the screen portion 21, it is preferable to construct the display screen 20 such that the thickness Tx of the long side 25x is smaller than the thickness Ty of the short side 25y.

The diagonal portion 25d is more rigid to the stress than the long side 25x and the short side 25y. Therefore, in order to uniformly distribute the stress, it is preferable to construct the display screen 20 such that the thickness Td of the diagonal portion 25d is smaller than the CFT and the thickness Tx of the long side 25x and the thickness Ty of the short side 25y.

In short, the display screen 20 is constructed such that the thickness of the short side 25y is the largest, and the thickness of the long side 25x is smaller than the thickness of the short side 25y and greater than the thickness of the central position of the screen portion 21, which is smaller than the thickness of the long side. 25x, which is greater than the thickness of the diagonal portion 25d, and the thickness of the diagonal portion 25d is the smallest. Therefore, the stress is uniformly distributed on the display screen 20 and the tapered portion 30, and thus, the stress between the display screen 20 and the tapered portion 30 can be properly balanced.

Alternatively, the display screen 20 may be constructed such that the thickness Ty of the short side 25y is the same as the thickness Tx of the long side 25x, the thickness Tx of the long side 25x is equal to CFT, or the CFT is the same as the thickness Td of the diagonal portion 25d.

On the thin cathode ray tube according to the present invention, as described above, in the order of the short side 25y, the long side 25x, the center position of the screen portion 21, and the diagonal portion 25, the short side 25y, the long side 25x, the screen portion 21 central position and the thickness of the diagonal portion 25, so that the stress concentrated on the neck portion 32 of the tapered portion 30 is properly distributed to the display screen 20.

In the above description, the thicknesses SET(Tx, Ty, Td) of the sealing edges 25x, 25y, 25d are set in consideration of CFT. However, it is also possible to set the thickness SET(Tx, Ty, Td) of the sealing edges 25x, 25y, 25d regardless of the CFT, as explained in more detail below.

In order to uniformly distribute the stress, it is preferable to construct the display screen 20 such that the following inequality is satisfied: Td≠Tx≠Ty. That is, it is preferable to construct the display screen 20 such that the diagonal portions of the sealing edge, the long sides, and the short sides have different thicknesses so as to distribute stress evenly.

It is more preferable to configure the display screen 20 so that the following inequality is satisfied: Td<Tx<Ty.

The side wall 23 of the display screen 20 is the part where the tapered portion 30 connects to the display screen. When the thickness of the side wall 23 is excessively reduced, the connecting force between the side wall 23 and the tapered portion 30 is reduced. Therefore, stress concentrates on the connecting body between the display screen 20 and the tapered portion 30, thereby lowering the rigidity of the thin cathode ray tube.

In addition, the stress concentrated on the long side 25x of the display screen 20 is greater than the stress concentrated on the short side 25y of the display screen 20 . Therefore, in order to uniformly distribute the stress concentrated on the screen portion 21 and the tapered portion 30, it is preferable to construct the display screen 20 such that the thickness Tx of the long side 25x is smaller than the thickness Ty of the short side 25y.

In addition, the diagonal portion 25d is more rigid to the stress than the long side 25x and the short side 25y. Therefore, in order to uniformly distribute the stress, it is preferable to construct the display screen 20 such that the thickness Td of the diagonal portion 25d is smaller than the thickness Tx of the long side 25x and the thickness Ty of the short side 25y.

In short, the display screen 20 is constructed such that the thickness of the short side 25y is the largest, the thickness of the long side 25x is smaller than that of the short side 25y, and greater than that of the diagonal portion 25d, and the thickness of the diagonal portion 25d is the smallest. Accordingly, the stresses generated on the display screen 20 and the tapered portion 30 are evenly distributed by the sealing edge, thereby properly maintaining the stress balance between the display screen 20 and the tapered portion 30 .

[Table 1] Experiment 1 of the present invention Experiment 2 of the present invention traditional experiment SET Tx 15.8 15.8 11 11.4 Ty 16 16 11 11.4 Td 12.5 11.85 11 11.4 Td/Tx 0.791 0.750 1.000 1.000 Td/Ty 0.781 0.741 1.000 1.000 Stress (Mpa) side wall 8.4 8.2 9.7 9.65 sealed edge x-axis 9.2 9.5 13.5 12.8 y-axis 9.5 10.1 13.9 13.4 z-axis 8.2 10.8 9.2 8.8 Cone 9.8 9.9 12.9 12.5 deflection part 8.4 8.1 12.5 12.7

It can be seen from the traditional experimental results that when the thickness SET (Tx, Ty, Td) of the sealing edge is the same, for example, when it is 11mm or 11.4mm, the stress distributed on the long side, short side and diagonal part of the sealing edge Close to 8.8 to 13.9Mpa, this stress is very large.

Specifically, when the thickness SET (Tx, Ty, Td) of the sealing edge is the same, considerable stress concentrates on the long side 25x and the short side 25, and considerable stress also concentrates on the tapered body and the tapered portion 30 on the deflection part. Therefore, stress is concentrated on the pipe portion 40, and the pipe portion 40 is easily damaged or exploded inwardly.

However, as can be seen from the results of Experiment 1 of the present invention, when the thickness of the short side 25y is set to 16mm, the thickness of the long side 25x is set to 15.8mm, and the thickness of the diagonal portion 25d is set to 12.5mm, The stress distributed on the long side, short side and diagonal part of the sealing edge is close to 8.2 to 9.8Mpa, which is very small. In this case, Td/Tx is 0.791, and Td/Ty is 0.781.

Therefore, when the thickness SET(Tx, Ty, Td) of the sealing edge is appropriately set in the order of the short side 25y, the long side 25x, and the diagonal part 25d as in Experiment 1 of the present invention, the stress does not exceed the pipe part. The stress limit of 40, that is, 10Mpa.

On the contrary, as can be seen from the results of Experiment 2 of the present invention, when the thickness of the short side 25y is set to 16mm, the thickness of the long side 25x is set to 15.8mm, and the thickness of the diagonal portion 25d is set to 11.85mm, The stresses distributed on the long sides, short sides and diagonal parts were close to 8.1 to 10.8 MPa, and the deviation thereof was increased compared with Experiment 1 of the present invention. In this case, Td/Tx is 0.750 and Td/Ty is 0.741.

Therefore, it can be seen that although the stress applied to the components of the tube portion 40 under the conditions of the experiment 2 of the present invention is smaller than that applied to the components of the tube portion 40 under the conventional experimental conditions, the short sides and diagonal portions The stress exceeds 10Mpa, therefore, the stress limit is not reached. For this reason, it is preferable to construct the display screen 20 so that the following inequalities are satisfied: 0.75<Td/Tx<1.0, and 0.74<Td/Ty<1.0.

As described above, the thicknesses of the short side 25y, the long side 25x, and the diagonal portion 25d are appropriately set such that the thickness of the short side 25y is the largest, and the thickness of the long side 25x is smaller than the thickness of the short side 25y and greater than the thickness of the diagonal portion 25d. , and the thickness of the diagonal portion 25d is the smallest, therefore, the following inequalities are satisfied: 0.75<Td/Tx<1.0, and 0.74<Td/Ty<1.0. Therefore, the stress locally concentrated on the thin cathode ray tube is uniformly distributed by the sealing edge.

In the above description, the display screen 20 is constructed such that the following inequality is satisfied: Td<Tx<Ty. Alternatively, the display screen 20 is constructed such that the following inequality is satisfied: Td<Tx≤Ty or Td≤Tx<Ty.

FIG. 9 is a detailed view showing the outer edge corners of the display screen of the thin cathode ray tube according to the present invention.

Referring to FIG. 9, the outer edge angle S of the side wall 23 is 0.5 to 1.5 degrees. The outer edge angle S of side wall 23 is preferably approximately 1.34 degrees.

Further, it is preferable to set the outer edge angle S of the side wall 23 so as to satisfy the following inequality: outer edge angle at the short side 25y>outer edge angle at the diagonal portion 25d>outer edge angle at the long side 25x.

Assuming that the thickness of the long side 25x of the sealing edge is Tx, the thickness of the short side 25y of the sealing edge is Ty and the thickness of the diagonal portion 25d of the sealing edge is Td, then according to the outer edge angle S, the thickness SET of the side wall 23 is set like this , so that the thickness of the long side 25x is the largest, the thickness of the short side 25y is the smallest, and the thickness of the diagonal portion 25d is smaller than the thickness of the long side 25x and greater than the thickness of the short side 25y.

On a thin cathode ray tube having an off-angle of 110 degrees or more, the total length of the tube portion 40 constituted by bonding the display screen 20 and the tapered portion 30 to each other is shortened, and therefore, the support for the display screen 20 is increased. and the vacuum force applied by the tapered portion 30.

However, according to the present invention, the outer edge angle S of the side wall 23 of the display screen 20 is set to approximately 0.5 to 1.5 degrees, which is smaller than the conventional outer edge angle of 3 to 4 degrees. Therefore, the thickness SET of the sealing edge of the side wall 23 is increased compared with the conventional art. Therefore, the display screen 20 according to the present invention can sufficiently withstand the increased vacuum force as the overall length of the tube portion 40 is shortened.

In addition, since the outer edge angle S of the display screen 20 is small, as described above, it is possible to effectively prevent the display screen 20 from being damaged when the display screen 20 is removed from the model during the production of the display screen 20, and therefore, the manufacturing of the display screen 20 can be improved. 20 productivity.

Further, the outer edge angle S of the display screen 20 is set so as to satisfy the following inequality: outer edge angle at the short side 25y>outer edge angle at the diagonal portion 25d>outer edge angle at the long side 25x. Therefore, the display screen 20 is constructed such that the thickness Tx of the long side 25x as the main part of the display screen 20 is the largest, the thickness Ty of the short side 25y is the smallest, and the thickness Td of the diagonal part 25d is smaller than the thickness of the long side 25x and larger than the thickness of the short side 25x. Thickness of side 25y. Therefore, the vacuum force can be effectively distributed, and thus, the anti-riot characteristic is improved.

In addition, since the outer edge angle S of the display screen 20 is reduced, when the reinforcing tape is wound around the side wall 23, the reinforcing tape can be prevented from slipping.

From the above description, it can be seen that the thickness of the central position of the display screen and the thickness of the long side, short side and diagonal part of the sealing edge are properly set to evenly distribute the stress locally concentrated on the tube part due to the increase of the deflection angle . Therefore, even if the total length of the pipe portion is shortened, the present invention has the effect of improving anti-riot characteristics and securing sufficient rigidity.

Furthermore, the thickness of the sealing edge of the display screen is appropriately set according to the present invention. Thus, during the production of the tube part, damage to the display screen can be prevented and the rules of inward explosion are fulfilled.

In addition, the outer edge angle of the display screen is set at 0.5 to 1.5 degrees, and the outer edge angle of the display screen is set so as to satisfy the following inequality: outer edge angle at the short side>outer edge angle at the diagonal portion>at The outer edge corner of the long side. Thus, the vacuum force is evenly distributed. Therefore, anti-riot characteristics and plasticity can be improved, and slipping of the reinforcing tape can be effectively prevented.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions can be made without departing from the essential scope of the present invention as disclosed in the appended claims .

Claims (10)

1. A display screen of a thin cathode ray tube constructed such that the deflection angle of electron beams is 110 degrees or more, the thin cathode ray tube comprising together constitute the tube section, of which The display screen includes: a screen portion on which an image is displayed; a side wall disposed around the screen portion such that the side wall is curved toward the tapered portion; and a sealing edge formed on the side wall on which the display screen is connected to the tapered portion. The tapered sections are joined together, Assuming that the thickness of the central position of the screen portion is Tc, the thickness of the long side of the sealing edge is Tx, the thickness of the short side of the sealing edge is Ty, and the thickness of the diagonal part of the sealing edge is Td, Then the display screen is constructed such that the following inequalities are satisfied: 0.8≤Tc/Ty≤Tc/Tx≤1.0≤Tc/Td, and Td<Tx<Ty, and The sidewalls have an outer edge angle of 0.5 to 1.5 degrees. 2. The display screen according to claim 1, wherein the display screen is constructed such that the following inequalities are satisfied: 0.75<Td/Tx<1.0 and 0.74<Td/Ty<1.0. 3. The display screen according to claim 1, wherein the total length of the tube portion is 350 mm or less. 4. The display screen according to claim 1, wherein the diagonal dimension of the display screen is approximately 700 to 800mm. 5. The display screen according to claim 1, wherein the display screen is approximately formed into a rectangular structure, and The outer edge angles are set such that the following inequality is satisfied: outer edge angles located on short sides>outer edge angles located on diagonal parts>outer edge angles located on long sides. 6. A display screen of a thin cathode ray tube constructed such that the deflection angle of electron beams is 110 degrees or more, the thin cathode ray tube comprising together constitute the tube section, of which The display screen includes: a screen portion on which an image is displayed; a sealing edge disposed around the screen portion such that the sealing edge curves toward the tapered portion where the display screen is joined to the tapered portion; and Assuming that the thickness of the central position of the screen portion is Tc, the thickness of the long side of the sealing edge is Tx, the thickness of the short side of the sealing edge is Ty, and the thickness of the diagonal part of the sealing edge is Td, Then, the display panel is constructed so that the following inequality is satisfied: 0.8≤Tc/Ty≤Tc/Tx≤1.0≤Tc/Td. 7. The display screen according to claim 6, wherein the display screen is constructed so as to satisfy one of the following inequalities: Td<Tx<Ty, Td<Tx≤Ty, and Td≤Tx<Ty. 8. A display screen of a thin cathode ray tube constructed such that the deflection angle of electron beams is 110 degrees or more, the thin cathode ray tube comprising together constitute the tube section, of which The display screen includes a sealing edge arranged around such that the sealing edge is curved towards the tapered portion, on which sealing edge the display screen is joined to the tapered portion, Assuming that the thickness of the long side of the sealing edge is Tx, the thickness of the short side of the sealing edge is Ty, and the thickness of the diagonal part of the sealing edge is Td, The display screen is then constructed such that the following inequality is satisfied: Td<Tx<Ty. 9. The display screen according to claim 8, wherein the display screen is constructed such that the following inequalities are satisfied: 0.75<Td/Tx<1.0 and 0.74<Td/Ty<1.0. 10. A display screen of a thin cathode ray tube constructed such that the deflection angle of electron beams is 110 degrees or more, the thin cathode ray tube comprising together constitute the tube section, of which The display screen includes side walls disposed around such that the side walls are curved toward the tapered portion, and The sidewalls have an outer edge angle of 0.5 to 1.5 degrees.

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