MXPA98005903A - Color image pipe device that has sharp grid of type of tens - Google Patents

Abstract

One objective is to remove the unnaturalities of the image caused by lower apparent screen flatness and provide a color image tube device designed to have a flatter apparent screen without deteriorating the static resistance of the image tube. The upper half of the panel (the upper part of the Z axis) shows the vertical axis section (V) and the lower half (the part below the Z axis) shows the horizontal axis section (H). The external surface of the panel is in a convex shape with respect to the Z axis in the vertical axis section (V) with a radius of curvature of ROV and is in a convex shape with respect to the Z axis in the axis section of the horizontal axis (H) ) with a radius of curvature of ROH. The inner surface of the panel is in an almost linear shape in the vertical axis section (V) with a radius of curvature of RIV and is in a convex shape with respect to the Z axis in the horizontal axis section (H) with a radius of curvature of R

Description

DEVICE OF PIPE OF COLOR IMAGERS WHICH HAS SHARP GRID OF TYPE OF TENSION BACKGROUND OF THE INVENTION Field of the invention The present invention relates to a color image tube device having a shadow grid of tension type. Description of the Prior Art Figure 21 is a side view partially in section showing a conventional color image tube device having a tension type shadow grid. In Figure 21, 1 denotes a panel forming the cover of the color image tube, 2 denotes a funnel that forms the color image tube cover together with the panel 1, 3 denotes a phosphor screen formed by accommodating the phosphors red, blue and green in order on the inner surface of the panel, 4 denotes an electron gun, 5 denotes an electron beam emitted from the electron gun, 6 denotes a deflection fork to electromagnetically deflect the electron beam 5, and 7 denotes a tension type shadow grid that serves as a color selection electrode. Figure 22 shows the structure of the tension type shadow grid 7 conventionally used. In Figure 22, for example, 8 denotes a frame formed of a steel material such as stainless steel (SUS) and 10 denotes an opening grid 10 having slit-like openings 11 and, for example, elongated pieces similar to ribbons. 9 formed of 0 1 mm thick effervescent steel. The aperture grid 10 is fixed and maintained by welding on the frame 8, while it is tensioned in one direction. Character 10a denotes damped wire and 10b denotes damped spring. It will then be described the operation The inner part of the color image tube is held at a high vacuum with the cover formed of the panel 1 and the funnel 2 The electron beam 5 emitted from the electron gun 4 is conducted to strike the phosphor screen with high applied voltage 3 on the inner surface of the panel 1 and causes it to emit light At the same time the electron beam 5 is deflected from side to side and from top to bottom and by deflection of the field gnético formed by the deflection fork 6, which forms an image display area called a screen on the phosphor screen 3 An image is observed in this image display area, observing from inside panel 1, the distribution of the intensities luminous red, blue and green on the phosphor screen 3 corresponding to the irradiation amount of the electron beam 5 A large number of slit-like openings 11 are arranged in order on the shadow grid The electron beam 5 passes through the openings 11 to geometrically strike the given position on the red, blue and green phosphor strips on the phosphor screen 3 for the correct selection of the color The shadow grid 7 formed of the elongated pieces 9 similar to tape is tensioned in one direction by the frame 8. Figure 23 is a front view of the phosphor screen of 3 seen from the observer side. In Figure 23, the center of the match screen 3 shows as the Z axis in the direction perpendicular to the screen, and the vertical direction is shown in V and the horizontal direction in H. The distances from the central axis Z to one end of the vertical axis V and one end of the horizontal axis H is taken as Iv and Ih, respectively. For the relationship between the structure of the shadow grid 7 and the phosphor screen 3, the direction of V corresponds to the elongated tape-like pieces 9 and the elongated tape-like pieces 9 are tensioned in the vertical direction V. The trend Recent technique in conventional color image tube devices that has such a structure is towards flat panels (phosphor screens). Since the color image tubes used conventionally are made of glass vacuum chambers, flat panels for weight reduction have not been used. On the other hand, the recent advance of technology, coupled with the development of simulation technology, is to allow the use of flatter panels. However, according to the experiments made by the inventors, as shown in Figure 24, when the face of a man is observed in an approach in a tube of images having a plate glass parallel to the plane, perfectly flat, as panel 1. for example. The man's face looks as if it were concave in the center.

The reason for this will be described with the panel 1 formed of a plate glass parallel to the piano shown in Figure 24. In Figure 24, the half is upper (above the Z axis) shows the section in the direction of the vertical axis ( V) and the lower half (below the Z axis) shows the section in the direction of the horizontal axis (H) In this case, when the observer 19 sees the phosphor screen 3 on the panel 1 at a point separated by 95 mm from the panel 1, for example, an apparent screen 20 is formed as shown by the chain-dotted line in Figure 25 That is, while the center of the screen is observed in a raised position by approximately one third of the TO thickness of the glass of the The panel is also covered by? T as it approaches the periphery of the screen. Consequently, when viewed from the observer 19, the apparent screen 20 is serrated in the center as shown by the dotted string line. This causes the face of man is v As it were concave in the center Figure 26 shows a conventional example of an improvement of this problem, where, as in Figure 24 the upper part of the Z axis shows the section in the direction of the vertical axis (V) and the bottom part of the Z axis shows the section and the direction of the horizontal axis (H) This panel 1 is flat in the vertical direction and has a triangular prism? TH in the peripheral part of the screen in the horizontal direction In this case, the apparent screen 20 is formed as shown by the dotted chain line 20 in Figure 27 That is, in the vertical direction, it is equal to that formed in the conventional flat panel. In the horizontal direction, the apparent screen becomes flatter, which is a notorious improvement compared to the plate panel parallel to the conventional plane 1. However, the insufficient flatness in the horizontal direction and the flatness problem in the vertical direction it still produces an uncomfortable impression. SUMMARY OF THE INVENTION According to a first aspect of the present invention, in a color image tube device having a panel forming a cover and a tension type shade grid provided to look at a screen formed on the surface internal of the panel, the axis extending from the center of the screen towards an observer in a perpendicular direction corresponds to a Z axis, where the panel has its external surface configured in a convex shape in the direction of the Z axis in the sections in both directions along the vertical and horizontal axes of the screen and the panel has its internal surface configured in an almost linear manner in the section in the direction of the vertical axis and in a convex shape with respect to the axis Z in the section in the direction of the horizontal axis. According to a second aspect of the present invention in a color image tube device having a panel forming a cover and a tension type shadow grid provided to look at a screen formed on the inner surface of the panel, the panel has its outer surface configured in roughly flat shape with a radius of curvature of R6000 or larger and the panel has its internal surface configured in a convex shape with respect to the Z axis in the sections in the direction of the vertical axis and in the direction of the horizontal axis According to a third aspect of the present invention, in a color image tube device having a panel forming a cover and a tension type shadow grid provided for looking at a screen formed on the inner surface of the panel, the inner surface of the panel is formed on a spherical surface of a non-cylindrical surface so that the thickness on the periphery of the panel that corresponds to the screen is greater than the thickness in the center of the panel and so that the thickness in the section in the direction of the vertical axis of the panel that corresponds to the screen is different from the thickness in the section in the direction of the axis horizontal Conventionally, since it was impossible to adjust the apparent elevation of the screen in the vertical direction, the apparent screen had anisotropy leading to lower flatness. From the first to the third aspect of the tube device of color images having a shadow grid of In addition, the panels of the conventional color image tube had problems in the static resistance of the image tube to some degree, since they did not have a triangular prism. The present invention solves or diminishes this problem thus providing a structure with a flatter, more desirable screen. It is an object of the present invention to remove unnatural images caused by lower flatness of the apparent screen and to provide a color image tube device designed to have an image tube device free of static resistance deterioration and a flatter apparent screen In addition, because it can utilize a conventional shading grid tensioned in the vertical direction as it is, it does not require the development of new parts. The objects, features, aspects and advantages of the present invention will become more apparent from the following description. Detailed description of the present invention when taken in conjunction with the accompanying drawings BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side view in partial section showing a tube of color images having a shadow grid of tension type in accordance with the first preferred embodiment of the present invention The Figur a 2, is a sectional view showing the portion of the panel to illustrate the operation of the first preferred embodiment. Figure 3 is a plan view showing the screen for illustrating the principle of the first preferred embodiment. Figure 4 is a sectional view showing the portion of the panel to illustrate the principle of the present invention. Figure 5 is a diagram to illustrate an example of calculations according to the present invention. Figure 6 is a sectional view showing the portion of the panel of a color image tube having a tension type shadow grid according to a second preferred embodiment of the present invention. Figure 7 is a plan view showing the screen for illustrating functions of the second preferred embodiment. Figure 8 is a diagram showing the auxiliary coil used in the second preferred embodiment. Figure 9 is a sectional view showing the portion of the panel of a color image tube device having a tension type shadow grid according to a third preferred embodiment of the present invention. Figure 10 is a diagram showing the amounts of triangular prism in the peripheral part of the screen and with respect to the curvatures of the inner and outer surfaces of the panel portion of a color image tube device having a tension type shadow grid according to a fifth preferred embodiment of the present invention. Figure 11 is a diagram showing the amounts of optical triangle in the peripheral part of the screen with respect to the curvatures of the inner and outer surfaces of the panel portion of a color image tube device having a grid of tension type shadows according to a sixth preferred embodiment of the present invention Figure 12 is a diagram showing the amounts of triangular prism in the peripheral part of the screen with respect to the curvatures of the inner and outer surfaces of the portion of the panel of a color image tube device having a tension type shadow grid according to a seventh preferred embodiment of the present invention. Figure 13 is a side view in partial section showing a device of color image tube having a tension type shadow grid according to a ninth embodiment of the present invention The Fi Figure 14, is a sectional view showing the portion of the panel of the ninth preferred embodiment. Figure 15 is a sectional view showing the portion of the panel to illustrate the operation of the ninth preferred embodiment. Figure 16 is a diagram to illustrate the principle of the present invention Figure 17 is a sectional view showing the portion of the panel of a color image tube device having a tension type shadow grid according to a tenth preferred embodiment of the present invention. Fig. 18 is a diagram showing the triangular prism amounts in the peripheral part of the screen with respect to the curvatures of the inner and outer surfaces of the panel according to the tenth preferred embodiment. Fig. 19 is a diagram that shows the quantities of triangular prism in the peripheral part of the screen with respect to the curvatures of the internal and external surfaces of the panel according to the or with an eleventh preferred embodiment Figure 20, is a sectional view showing the portion of the panel of an image tube device having a tension type shadow grid according to a twelfth preferred embodiment. Figure 21 is a side view in partial section showing a conventional color image tube device. Figure 22 is a perspective view showing a tension type shadow grid used in the conventional color image tube device. , is a diagram illustrating the system coordinate system of the screen Figure 24, is a sectional view showing a panel panel parallel to the conventional plane Figure 25, is a diagram that illustrates the characteristics of the parallel plate panel conventional Figure 26 is a sectional view showing a conventional improved panel Figure 27 is a diagram illustrating improved panel characteristics or conventional DESCRIPTION OF THE PREFERRED MODALITIES A First Preferred Modality A-1 Structure of the Device A first preferred embodiment of the present invention will now be described with an image tube having a diagonal dimension of 51 cm The image tube device of the first Preferred embodiment shown in Figure 1 has the same structure as the conventional image tube device shown in Figure 21, except in the form of panel 1, deflection fork 6 and auxiliary coil 12 added as needed. Specifically, in Figure 1, 1 denotes a panel forming the cover of the color image tube, 2 denotes a funnel that forms the cover of the color image tube (TRC) together with the panel 1, 3 denotes a phosphor screen formed by arranging the red, blue and green matches in order on the inner surface of panel 4 denotes an electron gun, 5 denotes the electron beam emitted from e the electron gun 4 6 denotes a deflection fork for electromagnetically deflecting the electron beam 5, and 7 denotes a tension type shadow grid that serves as an electrode for selecting colors The structure of the shadow grid of the type of Tension 7 is not described again since it has already been described with reference to Figure 22 Shadow grid 7 stretched in one direction has the characteristic that provides a more excellent image quality compared to a shaded mask in an isotropic shape (in all directions) as a shadow mask that has points-like openings Panel 1 has on its outer surface supepor configured in a convex shape both in the directions of the vertical and horizontal axis and its internal surface configured in a nearly linear section in the direction of the vertical axis and in a section convex with respect to the Z axis in the direction of the horizontal axis so the deflection shackle 6 apparently is the same as the conventional ones, differs with respect to the deflection magnetic field, especially with respect to the magnetic field produced by the vertical coil An auxiliary coil 12 can be provided on the side of the electron gun of the deflection shackle 6 A central plane of imaginary deflection 13 exists almost in the middle of the deflection shackle 6, which intercepts the Z axis to form the deflection center 14. Figure 2 is a sectional view showing, in an elongated manner, the main part of the panel 1, the phosphor screen 3 and the tension type shadow grid 7 of this preferred embodiment The upper half in the diagram (the upper part of the Z axis) shows the vertical axis section (V) and the lower half (the part below the Z axis) shows the section of the horizontal axis (H) As is clear from the drawing, for the external surface of the panel, the section of the vertical axis (V) is convex with respect to the Z axis with its radius of curvature ROV, and its section n of the horizontal axis (H) is convex with respect to the Z axis with its radius of curvature ROH For the internal surface of the panel, the vertical axis section (V) is almost linear with its radius of curvature RIV and the horizontal axis section (H) is convex with respect to the Z axis with its radius of curvature RIH When the thickness of the glass in the center of the panel 1 is taken as TO, the thickness of the TV glass of the panel 1 at one end of the vertical axis (X) is as TV = T0 -? TV Similarly, the thickness of the TH glass of panel 1 at one end of the horizontal axis (H) is given as TH = T0 +? TH The characters of? TV and? TH correspond to the differences between the thickness TO those at distances 1v and 1h from the center of the Z screen described with reference to Figure 23, which they refer to as "triangular prism" from now on Because the shadow grid 7 is stretched in the direction of the vertical axis (V), is in an almost linear form in cross section in the vertical direction The fo The grid of the shadow grid 7 in the horizontal direction forms a curved surface determined on the basis of the separation in the similar openings slits 11, the shape of the inner surface of the panel 1 and the dimension outside the axis SB of the Z axis of the electron beams from both sides in the central deflection plane 13 (referred to in Figure 1) For the electron beams from both sides if G is considered as the center between the three electron beams RG and B, the electron beams from both sides correspond to R and B 1-2 Operation In order to describe effects of the present invention, the reason why the apparent screen originates the problem when using a plate glass panel parallel to the conventional plane it will be described in detail with reference to Figure 4 and Figure 5 Figure 4 is a diagram showing the layout of a panel model unit to calculate how the phosphor screen 300 is viewed elevated The observer 19 sees the phosphor screen 300 applied on the inner surface of a flat panel from the position 95 mm away from the external surface of the panel 100 Here, the distance between the observer 19 and the outer surface of the panel 100 is given as 95 mm assuming the worst technical calculation In this calculation example, the outer surface of the panel 100 is not limited to a plane, but it is assumed to be a spherical radius (RE) in a concave shape with respect to the Z axis with its radius of curvature being variable It is assumed that the internal surface is flat and phosphor screen 300 is provided on it The thickness at the periphery in this case are taken as T0 +? TV at one end of the vertical axis of the screen and as T0 +? TH at one end of the horizontal axis of the screen Figure 5 shows calculations with this model In Figure 5 the ordinate shows the amount of apparent elevation (mm) and the abscissa shows the angle a at which the observer 19 sees the periphery ia of the phosphor screen 300 In Figure 5, using the radii of curvature RP (mm) as parameters, the amounts of elevation in the periphery are normalized with the amount of elevation in the center of the screen. In Figure 5, RP = 90000 corresponds to the plate parallel to the plane for the calculations (1) The screen covers the periphery even with a panel panel parallel to the plane (2) The amount of elevation becomes greater in the periphery as the radius of curvature becomes smaller (3) The characteristics shown in the Figure 5 are functions of the distance between the observer 19 and the panel (4) The amount of elevation can be reduced with negative spherical radius Although these calculations were made assuming that the internal surface was flat and the external surface had the concave shape with respect to to the Z axis, almost the same results were obtained optically with the 100-flipped glass panel. In the first mode, as shown in Figure 2, panel 1 has its external surface configu- It has a convex shape with respect to the Z axis and its internal surface configured in a linear form in cross section in the direction of the vertical axis and in a convex shape in cross section in the direction of the horizontal axis, thus reducing the amount of elevation in the periphery of the screen 3 to make the apparent screen 20 more flat That is, it uses the improvement factor with the negative spherical radius shown in Figure 5 In the first preferred embodiment forming the outer surface of the panel 1 in a convex shape means are provided to achieve the objective of the invention, or the reduction in the elevation at the periphery of the apparent screen 20 and forming the internal surface of the panel 1 into a linear section of the direction of the vertical axis facilitates the application of the shadow grid of type of tension 7. For the section in the direction of the horizontal axis, the panel was formed in a convex shape with respect to the Z axis considering the ration of the shadow grid 7, the amount deviated from the SB axis of the electron beams in the deflection central plane 13 and the amount of elevation. A-3. Characteristic Functions and Effects In the first preferred embodiment, as set forth, the apparent display 20 can be made flatter since the outer surface is convex with respect to the Z axis. For example, compared to the conventional example described by reference to Figure 26, it was clearly improved with respect to the direction of the vertical axis. In addition, it is possible to use an extension tension type shadow grid in the conventional manner, since the internal surface of the panel has a linear section in the direction of the vertical axis (V). When the outer surface was formed on a spherical surface as shown in Figure 2, it produces an unnatural impression in the presence of light reflection. It is therefore preferred to provide a coating film that reduces reflection 15 on the outer surface of the panel to remove extra light reflection.

The characteristics have been described in terms of shapes of the sections in the directions of the vertical axis (V) and the horizontal axis (H) The shape of the panel in the space between the two axes is not specifically limited while it is, for example, in a continuous and uniform shape For example, in Figure 3, with the radius of curvature RV of the vertical axis section (V) and the radius of curvature RH of the horizontal axis section (H), if the radius of curvature R Is defined with a section shape separated by? degrees of vertical axis (V) and including the center, the part between spaces can be configured as given by equation (1) below 1 / R2 = cos2? / RV2 + s? n2? / RH2 This equation (1) is applies to the spherical surface on the outer and inner surfaces B Second Preferred Modality B-1 Device Structure Figure 6 is a sectional view showing the main part of the panel of a color image tube device according to a second preferred embodiment of the present invention The color image tube device according to the second preferred embodiment is the same as that shown in Figure 1 except in the sectional form of the panel. In the second preferred embodiment, the external surface of the panel 1 is the same as that shown in Figure 2 in the first preferred embodiment The internal surface of the panel 1 is configured in a convex shape with respect to the Z axis both in the direction of the vertical axis (V), and in the direction on the horizontal axis (H). B-2 Operation When a panel configured in this manner is used, as shown in Figure 7, the change? S in the dimension outside the SB axis of the electron beam 5 deviated from the Z axis in the deflection central plane 13 on the beams of Electrons from both sides (reference is made to Figure 1) is used in vertical deflection. Specifically, the off-axis dimension of the electron beams 5 is changed from SB to SB +? S in the vertical deflection. Now, in Figure 1, if the distance from the center of deflection 14 to the periphery of the screen of the panel 3 is taken as L, the dimension q between the shadow grid 7 and the inner surface of the panel 1 is given by the equation (2) below. q = The / 3SB Equation (2) is to arrange the three colors of matches in the densest structure in the match screen 3 In the equation "a" denotes the separation of the shadow grid To lengthen SB in the vertical deflection to reduce q, it is necessary to change SB to SB +? S In order to change SB to SB +? S, the magnetic field produced by the vertical coil of the deflection fork 6 becomes even more almost in a barrel shape, or, as shown by the dotted line in Figure 1, an auxiliary coil 12 is provided on the back side of the deflection shackle 6 to generate a magnetic field component to produce for example? S As shown in Figure 8, for the auxiliary coil 12, for example, an auxiliary coil 12 is wound around a silicon steel plate 12a to generate the magnetic field shown by the dotted lines, thus producing the component? S shown in Figure 7 B-3 Functions and Characteristic Effects This structure allows the inner surface of the panel to be configured in a convex shape with respect to the Z axis also in the vertical direction. Furthermore, in this case, forming the internal surface of the panel in the convex shape with respect to the Z axis reduces the elevation of component due to the convex shape of the outer surface, thus providing a flat apparent screen 20 with more desirable result In the horizontal direction, it is constructed in the same manner as in the first preferred embodiment The second preferred embodiment is more advantageous than the first preferred embodiment with respect to explosion proof performance as a glass valve For reflection of light preferably a coating film is provided that reduces reflection 15 C Third Preferred Modality Figure 9 is a sectional view showing the main part of the panel portion of a color image tube device according to a third m odality The color image tube device according to the third preferred embodiment is the same as that shown in Figure 1 except in the sectional form of the panel. In the third preferred embodiment, the outer surface of the panel 1 is formed in a convex symmetrical shape of rotation with respect to the Z-axis. This reduces innaturality due to light reflection. It is preferred to provide a coating film that reduces reflection 15 in this case, also The surface internal of the panel 1 is formed in the same manner as in the second preferred embodiment D Fourth Preferred Modality The shapes of the internal and external surfaces of the panel can be defined considering? S, deflection characteristics and the flatness of the apparent display in the direction of the vertical axis (V) and in the direction of the horizontal axis (H), considering the flatness of the apparent screen Consequently, the design margin is preferably within 2 mm all on the panel 1 as an anisotropic component in this case The design in the direction of the horizontal axis it is required to consider only the amount of elevation However, as regards the direction of the vertical axis al, it is necessary to design? s only with the deflection shackle 6, or also with the auxiliary coil 12, thus allowing the somewhat smaller design margin In this case, the trend of? SV >; SH is used to form the inner surface of the panel in the convex shape in the direction of the vertical axis (V) E Fifth Preferred Modality E-1 Device Structure Figure 100 is a diagram showing the quantities of triangular prism in the periphery of the screen with respect to the curvatures of the inner and outer surfaces of the panel portion of a color image tube according to a fifth preferred embodiment of the present invention. Table 1 shows specific calculations in Figure 4 and Figure 5 in the case of an image tube having a diagonal dimension of 27 cm. Table 1 Screen 16: 9 a b c Rl e? RO eo D 53 ° 3.1 133.9 8500 1 05 -13000 069 H 48 ° 2.25 112.7 7000 0.91 -10000 0.64 V 29 ° 0.80 59.3 infinity 0 -6000 0.29 Table 1 shows an example with a conventionally used phosphor screen 3 having an aspect ratio of 16: 9, which corresponds to the worst possible case of a unit model as calculation of the apparent screen elevation 20 when the distance from the observer 19 to the center of the panel 100 glass is 95 mm as shown in Figure 4 In Table 1, D, H and V corresponding to the diagonal axis the horizontal axis and the vertical axis of the screen, respectively The character "a "corresponds to the angle a on the abscissa in Figure 5 which are 53 °, 48 ° and 29 °, with respect to the respective axes Character" b "shows the amount of elevation (mm) in case of using a plate panel parallel to plane 1 (RP = 90,000) in correspondence with a on the abscissa in Figure 5. The character "c" shows the dimensions corresponding to the distances 1h and 1v in Figure 23 and the distance of the axis one end of the diagonal axis. The radius of curvature Rl of the inner surface of the panel is R7000 in the horizontal axis section, for example Accordingly, in Figure 5 it is known that the amount of elevation in this case is 4.5 mm. To distinguish between the two radii of curvature RP on the external and internal surfaces, the radius of curvature of the inner surface is shown as Rl and that of the external surface is shown as RO E-2. Operation In the model shown in Figure 4, it is assumed that the center of the panel 100 is at a distance of 95 mm from the position of the eyes of the observer 19 and that the phosphor screen 300 is applied on the internal plane 13 mm offset Yes, in the inverse manner, the outer surface is flat and the phosphor screen R7000 is provided in a convex shape with respect to the Z axis (with respect to the direction of the eyes of the observer 19), as shown in FIG. Figure 10 (if the optical system is inverted), the characteristics can be considered as optically almost equal Consequently it rises 2.25 mm at the end of the horizontal axis (H) From the relation between the refractive index and the thickness of the panel, the amount of elevation in the center of the screen on the parallel plate panel is approximately 4 5 mm On the other hand with a panel having its internal surface formed as R7000, the amount of elevation in the center of the screen It is approximately 5.2 mm. Consequently, the difference in the amount of elevation, P, between the plate panel parallel to the plane and the panel with an inner surface of R7000 is about 0.7 mm. Therefore, when comparing the quantity the base on the periphery of the panel with that of the center, it is given as 2.25 mm - 07 mm = 1 55 mm at the end of the horizontal axis (H). The difference in the amount of elevation between the center of the panel and the periphery of the panel can then be reduced. The amount ei in Table 1 shows how the internal surface of the panel rises with respect to the Z axis, which is 091 mm in the direction of the horizontal axis (H) The quantity eo shows how the outer surface of the panel rises with respect to the Z axis. Figure 10 shows ei and eo with respect to the individual axes with respect to the individual axes, the three axes are drawn in a overlapped way. In Figure 10, the abscissa shows the distance from the center of the screen and the ordinate shows the coordinates of the Z axis of the panel, which show an external surface in a convex shape and a surface forming a spherical surface, which is not a surface spherical or a cylindrical surface, as shown in the figure Specifically, in Table 1, only the outer surface of the panel is formed in a convex shape to correct part of the amount of elevation of the plate panel glass parallel to the plane. both, in this state, the peripheral part will not be so thin that it is not advantageous with respect to the security design of the image tube. Consequently, the inner surface of the panel is formed in a convex manner with respect to the Z axis to form a triangular prism. This reduces the amount of elevation by the value of the compared with the case of a flat inner surface. In this example, the external surface of the panel has the following tendency: ROV = 6000 <; ROH = 10,000 < ROD = 13,000. The internal surface of the panel has the following tendency: RIH = 7000 < RIV = °°. Although the previous example has shown an example of a tube of images of 27 cm, the trends are not changed with a tube of images of 51 cm, where the radii of curvature are specifically larger than those shown in this example. Table 1 shows an extreme example numerically in the following aspects: A) The dimension (visual scale) of 95 mm from the position of the eyes 19 to the center of the screen is not common, which, in practice, is approximately 300 to 500 mm even with a tube of images for exhibition use. This shows that it is appropriate to use larger values such as the radii of curvature shown in Table 1 when this example is applied to real sizes. B) The values about the inner surface of the panel were obtained to form the internal surface in a convex shape with respect to the Z axis when its outer surface is flat in order to correct the amount of elevation in the periphery in the case of a plate parallel to the plane. Therefore it is not necessary to increase the values in terms of only the amount of elevation. E-3. Characteristic Functions and Effects With the structure described above, unlike the conventional case shown in Figure 26, the amount of elevation can be adjusted freely despite the fact that the section on the vertical axis is linearly formed for the use of a grids of shadows, thus providing a tube of images with improved flatness. The structure of the fifth preferred embodiment may also not be advantageous with respect to light reflection, since the outer surface of the panel is neither spherical nor planar. A coating film that reduces reflection is preferably provided on an external part of the panel as an opposite measure. F. Sixth Preferred Modality Figure 11 shows a sixth preferred embodiment, having some triangular prism on the axes (horizontal axis, vertical axis, and diagonal axis). This may be advantageous in the printing of flatness with respect to the reflection on the outer surface of the panel since the external surface of the panel has a convex shape, so that the structure is made such that RO > RI in the sections along the respective axes, where the radius of curvature of the external surface of the panel is taken as RO and that of the internal surface is taken as Rl. More specifically, ROV = 10,000 > RIV = 6000 ROH = 10,000 > RIH = 7000 ROD = 13,000 > RID = 8500 Compared to that shown in Figure 10, this preferred embodiment is more advantageous with respect to the security design of the image tube device, since it has a triangular prism specifically increased in the vertical direction. G. Seventh Preferred Modality Figure 12 shows a seventh preferred embodiment, corresponding to an example in which the outer surface of the panel in the sixth preferred embodiment is configured in a symmetrical manner by rotation with respect to the horizontal axis. The minimum radius of curvature can be R6000 as shown in Figure 10. In this case, the degree of reflection on the outer surface of the panel is improved in quality compared to that shown in Figure 11. H. Eighth Preferred Modality One Eight preferred embodiment corresponds to the example in which the outer surface of the panel shown in Figure 10 is configured in the same manner as shown in Figure 12. In this case, the degree of deflection on the external surface of the panel is further improved in quality sacrificing something apparent flatness. In this case, of course the formation of a reflective reduction coating film on the outer surface of the panel compensates for the disadvantage caused by the convex shape on the outer surface of the panel. I. Ninth Preferred Modality 1-1. Device Structure Now a ninth preferred embodiment of the present invention will be described with an image tube having a diagonal dimension of 51 cm as shown in Figure 13. The image tube device shown in Figure 13 almost has the same structure that the image tube device according to the first preferred embodiment described with reference to Figure 1, where the same components are shown in the same reference characters and are not described again. In Figure 13, the panel 1A has its outer surface formed almost flat and its inner surface formed as a convex surface, spherical and non-cylindrical with respect to the axis Z. Figure 14 is a sectional view showing the main part of the panel 1A, the phosphor screen 3A and the tension type shadow grid 7 in an elongated manner. The upper half in the drawing (the part above the Z axis) shows Is section of the vertical axis (V) and the lower half (the part below Z axis) shows the section of the horizontal axis (H). As is clear from Figure 14, the outer surface of the panel 1A is almost planar and its internal surface is formed in a convex form with respect to the Z axis along the vertical axis (V) and the horizontal axis (H '). When the thickness of the glass in the center of panel 1A is taken as TO, the thickness of the glass at the end of the vertical axis (V) of panel 1-is given as TV = T0 =? TV. Similarly, the thickness of the glass in The horizontal axis end (H) is given as TH = T0 +? TH Here? TV,.

? TH correspond to the differences in thickness between the center of the panel and the positions separated by 1v and 1h from the center of the Z screen shown in Figure 15, which are referred to as "triangular prism" Then set so that 0 < ? TV < ? TH Because the shadow grid 7 is tensioned in the direction of the vertical axis (V), its section in the vertical direction is almost parallel to the external surface of the panel 1A In the horizontal direction, the shadow grid 7 is formed in a curved surface determined on the basis of the separation of the slit-like openings 11, the shape of the inner surface of the panel 1a and the dimension on the axis of deviation SB of the Z axis to the lateral electron beams of both sides in the central plane of deflection 13 I-2 Operation Figure 15 is a diagram illustrating the effects of the structure described above In the drawing, the upper half shows the section of the vertical axis (V) and the lower half shows the section of the axis horizontal (H) As described, in panel 1A according to the ninth preferred embodiment, the outer surface is almost flat and phosphor screen 3A is provided on the inner surface which is convex in the direction of the Z axis With this structure, when the observer 19 is separated from the panel 1A by 50 cm, for example, the apparent screen 20 can be obtained as an almost flat screen 20 as shown by the dotted chain line On the outer surface of the panel The reflective reduction coating film 15 is provided The reason why apparent screen problems occur with a conventional flat panel glass is not described again, since it has been described with reference to FIG. This model is shown in Figure 16 In Figure 16, the ordinate shows the amount of apparent elevation (mm) and the abscissa shows the angle a to which the periphery of the phosphor screen 300 is seen In this drawing the amounts of elevation on the periphery they are normalized with the amount of elevation to the center of the screen using the radii of curvature RP (mm) as parameters In Figure 16, RP = 90000 can be considered as the cause of the plate parallel to the plane The calculations lead to the same conclusions as to the conclusions (1) to (4) described in the first preferred embodiment I-3 Characteristic Functions and Effects According to the ninth preferred embodiment, as shown in Figure 14, the panel 1A has its outer surface formed into a flat shape and its internal surface formed in a convex shape with respect to the Z axis to reduce the elevation to obtain a flatter apparent screen. It also has a triangular prism to suppress deterioration. of the static resistance That is, the formation of the triangular prism can reduce the stresses applied constantly by atmospheric pressure when the internal part of the CRT is evacuated to check the damage to the CRT It goes without saying, that improved flatness can be obtained when not only The apparent screen, but also the outer surface of the panel 1A, is flat as shown in Figure 15 On the other hand, l the absence of extra light reflection is most preferable. In addition, the formation of the reflection reduction coating film 15 is preferable. Although the characteristics have been described in terms of the shapes of the vertical axis section (V) and the section of horizontal axis (H), the panel can be formed without any limitation in the space between the axes, as long as they are formed in a continuous and uniform manner. Consequently, the shape in the part of the intermediate space can be determined on the basis of the equation (1) shown in the first preferred embodiment J Tenth Preferred Modality J-1 Device Structure Figure 18 is a diagram showing the amounts of triangular prism at the periphery of the screen with respect to the curvatures of the inner and outer surfaces of the panel of a color image tube device according to a tenth preferred embodiment of the present invention In the tenth preferred embodiment, as in the ninth preferred embodiment, the outer surface of the panel becomes flat and the inner surface of the panel is formed into a spherical shape, non-cylindrical and convex with respect to the Z-axis, wherein the thickness of the glass at the periphery of The panel screen is set in relation of T0 <; TV < TH < TD Where TO indicates the thickness of the glass in the center of the panel, TV indicates that at the end of the vertical axis (V) of the panel display, TH indicates the thickness of the glass at the end of the horizontal axis (H) of the panel display and TD indicates that it is at the end of the diagonal axis of the panel display. Table 2 shows the specific calculations obtained using Figure 16 with an image tube device having a diagonal dimension of 20 cm and satisfying the conditions for thickness stated above. Table 2 Screen of 4: 3 a b e RP e D 45 ° 2.0 101.7 6500 0.80 H 37 ° 1.2 77.5 5000 0.60 V 29 ° 0.75 57.3 4900 0.34 This example corresponds to the worst case of estimation of elevation of the apparent screen in which the phosphor screen 3 has a height-to-width ratio of 3: 4 and the distance between the observer 19 and the center of the panel glass is 95 mm as shown in Figure 4. J-2. Operation In Table 2, D, H and V correspond to the diagonal axis, the horizontal axis and the vertical axis of the screen, respectively. The character "a" corresponds to the angle a on the abscissa shown in the Figure 16, which are 53 °, 48 ° and 29 ° with respect to the respective axes. Character "b" shows the amount of elevation (mm) that corresponds to a on the abscissa in Figure 16, in the case of a plate panel parallel to the plane (RP = 90,000). The character "c" denotes the dimensions corresponding to 1h and 1v in Figure 23 and the distance between the Z axis and the end of the diagonal axis. For RP, when RP is R5000 and a = 37, for example, it is known from Figure 16 that the amount of elevation in this case is 2.4 mm in the horizontal axis section. In the model shown in Figure 4, it is assumed that the center of the panel 100 is in the distance of 95 mm from the position from the eyes of the observer 19 and the phosphor screen 300 is applied on the internal plane (parallel to the plane) separated 13 mm away from it. When, in a reverse manner, the flat surface is located on the outside and a phosphor screen R5000 is provided in a convex shape with respect to the Z-axis (with respect to the direction of the eyes of the observer 19) as shown in FIG. Figure 17, that is, when the optical system is reversed, the characteristics can be considered optically as almost equal. Specifically, at the periphery of the panel in the direction of the horizontal axis, the position of 1h in Figure 23, the apparent screen position is located 2.4mm inside. Here, because the periphery of the panel in the direction of the horizontal axis is in the position less than 0.6 mm from the central position of the inner surface of the panel, the amount of elevation of the apparent screen is +1.8 mm. On the other hand, in the center of the screen, because the difference in the amount of elevation that results from the use of the inner surface of R5000, P P, is approximately 1.0 mm, the total elevation amount is approximately 08 mm Compared with the amount of elevation of 1 2 mm with a plate parallel to the conventional plane, the difference between the central part and the periphery can then be reduced J-3 Characteristic Functions and Effects Therefore, it is possible to form an apparent screen along the individual axes closest to the plane The amount e in Table 2 shows how it rises compared to a flat plate, which is 06 mm in the horizontal axis direction Figure 18 shows the values of e with respect to the individual axes, where the three axes are drawn in an overlapping manner In Figure 18, the abscissa shows the distance from the center of the screen and the ordinate shows the coordinates of the Z axis of the panel, which shows a a flat external surface and an internal surface in the shape of a spherical surface, which is not a spherical surface nor a cylindrical surface in cross sections along the respective axes, as shown in the drawing. This trend does not change even if the phosphor screen is increased in size where the radii of curvature will specifically be larger than those shown here K Eleven Preferred Modality Figure 19 is a diagram showing the amounts of triangular prism at the periphery of the screen with respect to the curvatures of the internal and external surfaces of the panel of a color image tube device according to an eleventh preferred embodiment. Table 3 shows calculations with a tube width of 27 cm with a phosphor screen of 16 9 in the case with the thickness of the panel glass set to T0 < TV < TH < TD, as in the tenth preferred modality. Table 3 16: 9 screen a b c RP e D 53 ° 3.1 133.9 8500 1 05 H 48 ° 2.25 112.7 7000 091 V 29 ° 0 80 59.3 4400 040 L. Doceava Preferred Modality L-1. Device Structure Next, a twelfth most preferred embodiment will be described with reference to Figure 7, Figure 8 and Figure 10 In the twelfth preferred embodiment, the amount deviated from the SB axis from the Z axis of the electron beams of both sides in the central plane of deflection 13 (refers to Figure 13) is increased in the vertical deflection to ensure the amount of triangular prism by the deflection shackle For this purpose, the characteristics of the magnetic field of the vertical coil of the shackle are used. deflection of the auxiliary coil 12 shown in Figure 13 In the auxiliary coil 13, as shown in Figure 8, the auxiliary coil 13 is wound around the silicone steel plate 12a to generate the magnetic field shown by the dotted lines . L-2 Operation When the distance from the center of deflection 14 to the periphery of the phosphor screen 3 is taken as L as shown in Figure 14, the dimension q between the shadow grid 7 and the inner surface of the panel 1A is represented by Equation (2) shown in the second preferred embodiment. In the vertical direction, in order to obtain the triangular prism of? TV (to increase SB and decrease q), the value of SB changes to SB +? S to increase the value of SB in the previous equation. In order to obtain the component of S, the magnetic field by the vertical coil of shackle of deflection 6 is formed in a direction almost close to a barrel in the conventional and in the horizontal direction, to finally produce the triangular prism on the Panel glass in the vertical direction. By other means to produce S, said current to produce the magnetic field as well as generate S, is passed to auxiliary coil 2. Figure 20 shows a section of panel 1A in the twelfth preferred embodiment. As shown in Figure 20, the outer surface of panel 1A is planar and its internal surface is convex with respect to the Z axis. In addition, the amount of the triangular prism? TV in the vertical direction and the amount of the triangular prism? TV in The horizontal direction with respect to the TO thickness at the center of the panel are different, such as? TV < ? TH, for example. Specifically, they can be set as? TV = 1.5 mm and? TH = 2.0 mm, for example. L-3, Characteristic Functions and Effects The design in the horizontal direction requires considering only the amount of elevation for? TH. For? TV in the vertical direction, the dimension q between the shadow grid 7 and the inner surface of panel 1 is important in relation to the arrangement of beams R, G and B. In this example, given that the grating remains 7 is tensioned in one direction, the magnetic field produced by the vertical coil of the deflection shackle 6 is made in a direction almost like a barrel, and the auxiliary coil 12 is provided on the side of the electron gun of the deflection shackle 6 as shown by the dotted line in Figure 13 to lengthen SB and reduce q, ensuring the? TV. This allows the formation of a sufficient triangular prism also in the vertical direction. While the invention has been described in detail, the foregoing description is in all respects illustrative and not restrictive. It is understood that numerous modifications and variations can be made without departing from the scope of the invention.

Claims (20)

1. CLAIMS 1. A color image tube device having a panel forming a cover and a tension type shadow grid provided to look at a screen formed on the inner surface of the panel, wherein the axis extending from the center of the screen towards an observer in a perpendicular direction corresponds to the axis Z, and wherein said panel has its internal surface configured in a convex shape and in the direction of the Z axis in the sections both in the directions along the vertical axis and the horizontal axis of said screen, and the panel has its internal surface configured in an almost linear fashion in the section in the direction of the vertical axis and in a convex shape with respect to the axis z in the section of the direction of the horizontal axis.
2. 2. The color image tube device having a tension type shadow grid according to claim 1, wherein, when the radius of curvature of the external surface in the section in the direction of the vertical axis is taken as ROV, and the radius of curvature of the outer surface in the section in the direction of the horizontal axis is taken to be ROH, the external surface of the panel is configured in a convex shape having the ROV ratio < ROH
3. The color image tube device having a tension type shadow grid according to claim 1, wherein the outer surface of the panel is in a symmetrical convex shape of rotation with respect to the Z axis.
4. 4 A tube device of color images having a panel forming a cover and a shade grid of tension type provided to look at a screen formed on the inner surface of said panel, wherein the panel has its external surface configured in roughly flat form with a radius of curvature of R6000 or larger, and said panel has its internal surface configured in a convex shape with respect to the Z axis in the section in the direction of the vertical axis and in the section in the direction of the horizontal axis
5. 5 The image tube device of color having a tension type shadow grid according to claim 4, wherein the external surface of the panel is in a broken symmetric convex with respect to the Z axis
6. 6 The color image tube device having a tension type shadow grid according to claim 4, wherein, when the radii of curvature of the external surface of the panel in the section of the direction of the vertical axis in the section in the direction of the horizontal axis and in the section in the direction of the diagonal axis are taken as RO, and the radii of curvature of the internal surface of the panel in the section in the direction of the axis vertical in the section of the direction of the horizontal axis and in the section in the direction of the diagonal axis are taken as Rl, the outer surface and the inner surface of the panel are in convex forms having the ratio RO > RI in the respective sections along each of the axes
7. 7 The color image tube device having the tension type shadow grid according to claim 4, wherein the shape of the inner surface of the panel is determines, in the section in the direction of the vertical axis, on the basis of the amount of change in position,? S, of two electron beams on both sides between three electron beams in the central plane of deflection for the electron beams and deflection characteristics, and in the section in the direction of the horizontal axis, so that the apparent screen formed inside the panel is approximately flat
8. 8 The color image tube device having the tension type shadow grid in accordance with the reinvidication

   7, wherein the amount of change in position,? S, of said two electron beams is given as different values in vertical deflection and horizontal deflection
9. 9. The color image tube device having the shadow grid of the tension type according to claim 8, wherein the amount of change in position,? S, of said two electron beams corresponds to the amount of change in a direction in which said two electron beams are separated from the Z axis, and the amount of change in position, S, of said two electron beams is given as a larger value in the vertical deflection than in the horizontal deflection
10. 10. The color image tube device having the tension type shadow grid according to claim 9, comprising a deflection fork for electromagnetically deflecting the electron beams, wherein the deflection fork generates magnetic field for vertical deflection having a distribution even closer to a barrel shape to separate said electron beams from the axis
11. 11. The color image tube device having the tension type shadow grid according to the claim

    10, further comprising an auxiliary coil provided on the side of the electron gun of the deflection fork to generate the magnetic field affecting the electron beams, wherein the two electron beams are separated from the Z axis using the generated magnetic field by the auxiliary coil
12. 12. A color image tube device having a panel forming a cover and a tension type shadow grid provided to look at a screen formed on the inner surface of said panel, wherein the inner surface of the panel is formed on a surface spherical or a non-cylindrical surface so that the thickness at the periphery of said panel corresponding to said screen is larger than the thickness in the center of the panel and so that the thickness in the section in the direction of the vertical axis of the panel which corresponds to the screen is different from the thickness in the section in the direction of the horizontal axis.
13. 13. The device of the color image tube having a shadow grid of the voltage type according to claim 12, wherein, when the thickness in the center of the panel corresponding to the screen is taken as TO, the thickness in one end of the section in the direction of the vertical axis of the panel corresponding to the screen is taken as TV, the thickness at one end of the section in the horizontal axis direction of the panel corresponding to the screen is taken as TH, and the thickness at one end of the section in the direction of the diagonal axis of the panel corresponding to the screen is taken as TD, then, the thickness at the periphery of the panel screen is set at the ratio T0 < TV < TH < TD
14. 14 The color image tube device having the tension type shadow grid according to claim 12, wherein, when the radius of curvature of the inner surface of the panel in the section in the direction of the vertical axis is takes as RV, the radius of curvature of the inner surface of the panel in the section in the direction of the horizontal axis is taken as RH, and the radius of curvature of the internal surface of the panel in the section in the direction of the diagonal axis is taken as RD, then the inner surface of the panel is in a convex shape having the ratio RV < RH < RD
15. 15 The color image tube device having the tension type shadow grid according to claim 12, wherein the outer surface of the panel is approximately flat
16. 16 The color image tube device having the shadow grid of tension type according to claim 12, wherein the thickness of the panel is determined, in the section in the direction of the vertical axis, on the basis of the amount of change in position,? S, of two electron beams on both sides between the three electron beams in the plane of the deflection center for the electron beams and deflection characteristics and so that the apparent screen formed inside the panel is approximately flat, and in the section in the direction of the horizontal axis, so that the apparent screen is approximately flat
17. 17 The color image device having the tension type shadow grid according to claim 16, wherein the amount of change in position,? S, of said two electron beams are given as different values in vertical deflection and horizontal deflection
18. 18. The color image tube device having the shadow grid of the tension type according to claim 17, in where the amount of change in position,? S, of said two electron beams corresponds to the amount of change in a direction in which said electron beams were separated from the Z axes, and the amount of change in position,? S , of said two electron beams is given as a larger value in the vertical deflection than in the horizontal deflection
19. 19 The color image tube device having the shadow grid of e type of tension according to claim 18, comprising a deflection fork for electromagnetically deflecting the electron beams, wherein said deflection fork generates magnetic field for vertical deflection having a distribution even closer to a barrel shape to separate the two electron beams of the Z axis
20. 20. The color image tube device having the tension type shadow grid according to claim 19, further comprising an auxiliary coil provided on the side of the electron gun of the deflection fork to generate a magnetic field that affects the electron beams, where the two electron beams were separated from the Z axis using the magnetic field generated by the auxiliary coil.