JPH0536363A - Display device - Google Patents

Abstract

PURPOSE:To shorten a depth of a display device for scanning electron beam inside of a flat vacuum case, and give the sufficient strength against the atmospheric pressure. CONSTITUTION:A vacuum case consists of a flat rectangular faceplate 21, to which inner surface a fluorescent body screen is attached, and side walls 22 extending from the periphery of the faceplate 21 to the direction practically vertical to the face plate 21 and a rear plate 23 opposite to the faceplate 21. Multiple bar-shape support means 31 respectively having yoke-shape tip are arranged between the faceplate 21 and the rear plate 23, and when plate thickness of the faceplate 21 is (t) and a space between the support means 31 is P, a ratio (t)/P is set at 0.05 or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device having a flat face plate and scanning a screen surface formed on the face plate into a plurality of small areas by an electron beam. .

[0002]

2. Description of the Related Art A cathode ray tube is a typical display device for scanning an electron beam in a vacuum envelope to display an image on a phosphor screen. In recent years, various studies have been made to meet the demand for a high-resolution picture tube for high-definition broadcasting or a large screen accompanying it. In order to achieve high resolution of the picture tube, the electron beam spot diameter on the screen surface must be reduced. On the other hand, improvements in the electrode structure of the electron gun, which is the source of the electron beam, or the enlargement and extension of the electron gun itself have been attempted, but this is not sufficient. The main reason for this is that as the tube becomes larger, the distance between the electron gun and the screen surface becomes longer, and the electron lens magnification becomes too large. That is, it is important to shorten the distance between the electron gun and the screen in order to realize high resolution. Further, in this case, the method using wide-angle deflection is not a good measure because it causes an increase in the difference in magnification between the center and the periphery of the screen.

Therefore, a method of displaying a large screen with high resolution by arranging a plurality of independent small picture tubes has been conventionally used.
JP-A-48-90428, JP-A-49-21019, and Shokai
It is proposed in Japanese Patent Publication No. 53-117130. This kind of method is effective for a large screen display with a large number of divisions placed outdoors, but in the case of a medium-sized large screen display with a display screen size of about 40 inches, the joint part of the screen for each area is It is obvious that the reproduced screen becomes difficult to see. In particular,
Needless to say, when used as a graphic display terminal for computer aided design (CAD), having a joint on the display screen is a fatal defect. Therefore, a structure in which a plurality of independent picture tube screens are integrated is also disclosed in US Pat. No. 3,073.
1,706, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928
It is proposed in Japanese Patent Publication No. 50-17167, etc.

As shown in FIG. 13, a picture tube 1 having an integrated screen structure includes a face plate 3 having a screen surface 2, a rear plate 4 facing the face plate 3, and a plurality of funnels 5 following the rear plate 4. And a vacuum envelope consisting of a neck 6 continuous from the funnel 5.
The face plate 3 is at least glass, and the rear plate 4 is glass or metal. In such a structure, when the screen surface 2 becomes large, the face plate 3 and the rear plate 4 must be made considerably thick in order to support the vacuum, and a large curvature must be given in the tube axis direction. For this reason, the entire envelope becomes extremely heavy, and the screen surface 2 has a curvature in the tube axis direction and is very difficult to see. Furthermore, the distance between the screen surface 2 and the electron gun 7 enclosed in the neck 6 becomes large, which is not preferable in terms of the magnification of the electron lens.

When a metal is used for the rear plate, there is known a method of providing a reinforcing plate (beam) on a relatively thin metal plate in order to maintain sufficient strength against atmospheric pressure and to reduce the weight. .

The rear plate using this metal is very effective when there is no protruding member such as a funnel or a neck on the back surface of the display device. Further, the funnel and the neck are arranged on the back surface, and the rear plate is built in the neck. When applied to the structure of the envelope of a display device such as a cathode ray tube that emits an electron beam from an electron gun and divides the screen surface into multiple areas for scanning, the rear plate, which has been complicated in the past, can be simplified. Can be made into any shape. However, in a cathode ray tube in which a funnel and a neck are connected to a rear plate and the fluorescent screen is divided and scanned, the position of the electron gun, which is the emission position of the electron beam, and the position of the fluorescent screen must be accurately aligned with a predetermined position. Since the metal rear plate is more easily deformed by the atmospheric pressure than the glass rear plate, the position of the electron gun is changed by the deformation of the metal rear plate, and the electron beam cannot be emitted from the predetermined position in the predetermined direction. Remarkably deteriorates the screen quality. Therefore, the metal rear plate is effective only for a display device that does not affect the internal structure or the electron beam trajectory even if the rear plate is deformed to some extent by atmospheric pressure, and is like a cathode ray tube in which the funnel and neck are connected to the rear plate. When applied to such a structure, the amount of deformation must be calculated in advance so that the electron gun is arranged at a predetermined position after the deformation, which is not preferable in designing, manufacturing, and managing the cathode ray tube.

Further, inside the rear plate (inside the envelope)
In a cathode ray tube in which is a high potential equipotential space, a structure that electrically insulates this high potential so that it is not exposed to the outside is necessary. In a cathode ray tube in which the funnel or neck is connected to the rear plate, this potential is Is extremely high, which is not preferable for practical use.

Further, the rear plate 4 corresponding to the funnel of the conventional cathode ray tube shown in FIG. 13 cannot have a structure including an abrupt shape change from the viewpoint of moldability of glass or strength with respect to the atmosphere, and its shape is entirely. There is no choice but to use a shape that changes gently. Therefore, it is extremely difficult to make the shape of the portion on which the deflecting device is mounted almost equal to the deflection area of the electron beam, and it is extremely difficult to thin the glass of the deflecting device mounting portion, and a small deflecting device with a small deflection power is used. Is impossible.

In addition, a metal plate is used for the rear plate, the inner surface shape of the funnel in which the deflection yoke is mounted is brought close to the actual electron beam trajectory region, and even if the funnel is formed thin, the metal rear surface adjacent to the deflection device Loss due to eddy currents generated in the plate is unavoidable, resulting in an increase in deflection power. Further, when the metal rear plate is used, the metal plate is arranged between the adjacent deflecting devices, the magnetic fields of the deflecting devices easily interfere with each other, and it is extremely difficult to form an appropriate magnetic field distribution.

Generally, in the case of a vacuum envelope with a flat faceplate, the use of supports to support large area faceplates is well known in connection with evacuated solar heat collectors. As a flat display device using these supports, JP-A-56-106353, JP-A-62-272432, JP-A-62-285335, JP-A-63-128532, and KAISHO 48-90183,
Many proposals have been made such as Japanese Patent Laid-Open Nos. 64-10553 and 1-117251.

As shown in FIGS. 14 and 15, there is a long plate-shaped support means 11 or a needle-shaped support means as a method for supporting the atmospheric pressure applied to the flat envelope 10 whose inside is exhausted. The long plate-shaped supporting means 11 prevents the load of atmospheric pressure from concentrating on one point by supporting the screen surface 12 with a wide contact area. It was found that it has various problems.

First, there is a problem of processing accuracy of the supporting means.
In this method, as shown in FIG. 16, it is necessary to process the end portion 11a which abuts along the black stripe 12a on the screen surface into a knife edge shape, and further, the distance between the face plate and the rear plate and the length (high height) of the supporting means. Sa) must be exactly the same. For this processing, for example, if the knife edge length is about 30 mm or less, it can be processed practically (mass production), but if it is longer than that, special finishing processing is required and it is inexpensive. It is impossible to make. The second problem is the strength of the plate member. In the case of a plate-shaped member, the strength is strong when a load is applied in a direction parallel to the surface of the plate material, but when a load in a direction that is inclined with respect to the surface is applied, it is easily deformed and other adjacent support means Excessive load is applied. Third is a method of attaching the plate member. Since the plate-shaped member cannot stand on its own, in order to mount the plate-shaped member on the rear panel or the like, a fixing jig is required in the case of a member for standing upright with respect to the rear panel or welding. Fourth is the problem of warpage. The plate-shaped member is strong against in-plane deformation, but is easily deformed in a direction other than the in-plane direction, and as shown in FIG. 17, is likely to be deformed 11b during mounting or during a heating process. Fifth is the problem of contact with the glass plate. Since ordinary plate glass is manufactured by the float method, it is impossible to completely uniformize the thickness of the plate glass. This distribution of plate thickness does not show a sharp difference in the plate thickness in a relatively narrow area of about 50 mm, but the difference in the plate thickness is 0.05 in a relatively wide area of about 200 mm.
It may be from mm to 0.1 mm. That is, even if the plate-shaped supporting means is processed with high precision and assembled, it does not always come into complete contact with the plate glass of the face plate.

Next, problems with the needle-shaped supporting means will be described. First is the number of issues needed to support atmospheric pressure. The plate-shaped supporting means has a relatively large contact area with the glass, whereas the needle-shaped supporting means has a very small contact area. Therefore, an extremely large number of needle-shaped supporting means are required to reduce the load amount of each supporting means. Specifically, it is necessary to arrange at a pitch of 10 mm or less, and 1000 or more needle-shaped supporting means are required to support the atmospheric pressure applied to the plate glass having a diagonal dimension of the screen of 20 inches. Secondly, there is the problem of processing accuracy. In this method, it is necessary to process the tip into a needle shape. Generally, a method of processing a wire into a needle shape can be easily processed by cylindrical polishing or the like, but it is difficult to accurately align the center axis of the wire and the needle-shaped tip after processing, and it is often processed eccentrically. . Third is the strength problem of the needle-shaped member. Similar to the plate-shaped supporting means, it is strong against the load in the axial direction of the wire rod but extremely weak against the load in the direction inclined with respect to the axis, easily deforms and the excessive load is applied to other adjacent supporting means. Join. Fourth is the method of attaching the needle-shaped member. As with the plate-shaped support means, thin needle-shaped members cannot stand on their own, so to attach the needle-shaped members to the rear panel, etc., a member to stand vertically with respect to the rear panel or a fixing jig for welding is required. Is.

As described above, the plate-like or needle-like supporting means is not preferable in terms of structure, manufacturing as a part, assembly, or price. Further, the many flat cathode ray tubes proposed so far include a large number of linear cathodes 13 and a large number of control electrodes 14, accelerating electrodes 15, deflection electrodes 16, etc., as shown in FIG. It is very complicated and has many problems in mass production, and if the screen surface becomes large, manufacturing becomes extremely difficult. In addition, the large number of these supporting members and internal electrodes causes a problem of the occluded gas of such members, which greatly deteriorates the life characteristics of the cathode ray tube, which is not preferable in practical use.

[0015]

As described above, in a display device such as a cathode ray tube, it has a high resolution, a short depth, and an easy-to-see screen, and it has a simple structure, is practical, and has an industrial value. When trying to get a high cathode ray tube,
The conventional technique has various problems and is difficult to achieve. The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a display device having high practical value and high industrial value.

[0016]

In order to solve the above-mentioned problems, the present invention substantially comprises a flat first plate having at least a substantially rectangular shape and a peripheral portion of the first plate to substantially form the first plate. A vacuum envelope including a side wall extending in a direction perpendicular to the first plate and a flat second plate that is disposed substantially parallel to the first plate and an inner surface of the first plate. And a plurality of electron sources for generating electron beams for dividing and scanning the phosphor screen into a plurality of small areas, the phosphor screen being provided between the first plate and the second plate. At least a plurality of supporting means for supporting these plates at predetermined intervals are provided, and when the thickness of the first plate is t and the interval between the supporting means is P, the ratio t / P is 0.05 or more. Is characterized by.

Further, a substantially rectangular flat first plate, a side wall extending from a peripheral portion of the first plate in a direction substantially perpendicular to the first plate, and facing the first plate. Flat second arranged substantially parallel to each other
A vacuum envelope including a plate, a phosphor screen attached to the inner surface of the first plate, and a plurality of electron beams that generate an electron beam for dividing and scanning the phosphor screen into a plurality of small areas. An electron source, the first plate and the second
At least a plurality of supporting means provided between the plates for supporting the plates at a predetermined interval, the end of the supporting means on the side of the first plate is wedge-shaped, and the wedge-shaped ends are arranged in the longitudinal direction. It is characterized in that the length is 2 mm to 30 mm.

Further, a substantially rectangular flat first plate, a side wall extending from a peripheral portion of the first plate in a direction substantially perpendicular to the first plate, and facing the first plate. A second flat plate substantially parallel to each other and provided with a plurality of apertures, and a plurality of flat plates provided between the first plate and the second plate and supporting the plates at a predetermined interval. Of the second plate, a funnel connected to each of the plurality of openings of the second plate, and a neck extending from the funnel, the inner surface of the first plate. The phosphor screen has a deposited phosphor screen and an electron gun that is an electron source enclosed in each of the necks, and the phosphor screen has a plurality of small regions by electron beams from the plurality of electron guns. Minutes Is scanned, the plurality of supporting means on the division scanning of the boundary line is characterized by being located.

[0019]

In the present invention, a structure in which a plurality of independent screens are integrated is formed, this screen is formed on the inner surface of the glass face plate which is the first flat plate, and the vacuum envelope is formed together with this plate. The rear plate as the second plate to be formed is also made flat, and the supporting means for supporting against the atmospheric pressure is arranged between them. In addition, a plurality of electron sources that generate electron beams are arranged to face the screen. The supporting means is arranged on the screen surface with a predetermined space P therebetween. When the thickness of the face plate is t, by setting the ratio t / P to be 0.05 or more, it is possible to significantly reduce the thickness of the face plate and the number of supporting means. Therefore, the weight of the display device is reduced and the number of supporting means is small, so that the manufacturing is extremely easy.

Further, since the face plate and the rear plate are flat and the distance between the electron source and the screen surface can be set to the minimum and the same, the electron lens magnification of the electron beam can be reduced and the spot on the screen surface can be reduced. Form a high resolution image with a small size. The depth is shortened, the weight is reduced compared to the area of the screen surface, and the screen surface provides an image that is easy to see.

Further, in the present invention, the screen portions of a plurality of independent picture tubes are integrated, the screen portions are formed on the inner surface of the flat face plate, and the rear plate is also flat. A support means is arranged at. At this time, the end portion of the supporting means on the side of the first plate is formed into a wedge shape, and the length of the wedge-shaped end portion in the longitudinal direction is set to 2 mm to 30 mm, whereby the thickness of the face plate is made as thin as possible and the supporting means is The number can be greatly reduced. Therefore, the weight of the display device can be reduced and the number of supporting means is small, so that the manufacturing is extremely easy.

Further, since the face plate and the rear plate are flat, the distance between the electron source and the screen surface can be set to a minimum and the same, so that the electron lens magnification can be reduced and the spot on the screen can be reduced. High resolution can be achieved. At the same time, the display device has a very short depth. Further, since the screen surface is flat, it is possible to provide an image that is extremely easy to see. Combined with these advantages, it is possible to provide a display device having high practical value and high industrial value.

Further, in the present invention, the screen portions of a plurality of independent picture tubes are integrated, and the screen portions are formed on the inner surface of the flat face plate, and the rear plate is also made of flat glass. A structure is provided with apertures, and a support means for securing the space between both plates against atmospheric pressure is arranged between them. In addition, the funnel continues from the opening of the rear plate,
The neck portion is continuous from this funnel. By using the flat rear plate having the openings as described above, the supporting means can be arranged on the flat rear plate other than the openings, and the structure is very simple. it can. Further, as a result, the distance between each electron gun as an electron source and the screen surface can be set to a minimum and the same, so that the electron lens magnification can be reduced and the beam spot on the screen surface can be reduced.
High resolution can be achieved. At the same time, the display device has a very short depth. Since the screen surface is flat, it is possible to provide an image that is extremely easy to see. Further, the structure is very simple like a structure in which a plurality of ordinary picture tubes are arranged, and since the supporting means is provided, the face plate and the rear plate can be made thin, and the weight of the display device can be reduced. .

[0024]

[Practical Examples] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (Example 1)

1 to 5 show a display device which is an embodiment of the present invention. FIG. 1 is a perspective view showing the entire structure, and FIGS. 2 and 3 are sectional views. The display device 20 continues to the flat face plate 21, side walls 22 around the face plate 21 and extending in a direction substantially perpendicular to the plate surface, a rear plate 23 facing the face plate 21, and the rear plate 23. Multiple funnels 24 and neck 25
An electron gun 26 as an electron source is enclosed in the neck 25, and a deflection device (not shown) is arranged in the vicinity of the electron gun 26. The face plate 21 is made of flat glass and is coated with phosphors of one or three colors to form a phosphor screen 30. An electron beam emitted from each electron gun is deflected and scanned on the screen surface by a deflecting device, so that the phosphor is bombarded to emit light, and the raster R of each small area is emitted.
Draw 1, R2, R3 ..., R20. These small area rasters are connected by signals applied to the electron gun and deflection device,
Project one large raster on the entire screen. The rear plate 23 is also made of flat glass, has an opening 27 at a predetermined position, and a funnel 24 is joined to the opening 27. A supporting rod 31 as shown in FIG. 4 is fixed as a supporting means in the vicinity of the opening 27, and the tip 31a has a wedge shape, and the thin flat face plate 21 and the rear plate 23 are kept at atmospheric pressure. Against this, they are held at a predetermined interval. As shown in FIG. 5, the support rods 31 are arranged at the intersections 32 on the boundary line of the raster of the small area of the small area screen.

As described above, the substantially rectangular flat face plate, the side wall extending from the peripheral portion of the face plate in a direction substantially perpendicular to the face plate, and substantially facing the face plate at a predetermined interval. In a vacuum envelope including rear plates arranged in parallel, a strong atmospheric pressure acts on the entire envelope. For this reason,
With a 20-inch faceplate size, more than 1 ton of force is applied to the entire surface. In order to support this atmospheric pressure, it is more stable if the number of the supporting means is increased, but it is not preferable in mass production, and it is difficult to process the stored gas and the life characteristics are deteriorated.

Therefore, the inventors conducted a simulation described in detail below, and found that the distance between the plate thickness of the face plate of the display device having sufficient strength against atmospheric pressure and the distance between the supporting means without degrading the image characteristics. A predetermined relationship was sought.
That is, when the thickness of the face plate is t and the distance between the supporting means is P, the ratio t / P may be set to 0.05 or more.

The inventors of the present invention have variously examined the proof stress of a flat glass face plate against atmospheric pressure from an experiment using a rectangular vacuum device 40 having internal dimensions of 300 mm in length and 400 mm in width as shown in FIG. 6 and stress simulation. did. According to this result, the size equivalent to the 20-inch type, that is, the diagonal distance
In the case of 500 mm glass, unless the plate thickness is 15 mm or more, it will break at atmospheric pressure during vacuum. When the vacuum pump 41 is operated to evacuate the space between the vacuum device 40 and the glass, the glass 50 is curved from the mounting position 52 on the support frame 51 as shown in FIG. Cannot withstand atmospheric pressure. In a cathode ray tube with a glass face plate that is curved into a normal spherical surface, even if the thickness of the central part is 12 to 13 mm, the peripheral part exceeds the thickness of 20 mm, and the peripheral edge is tightened with a tension band to maximize the stress. Part is about 1000 [PSI]
Designed to be less than (pounds per square inch) to prevent damage to the envelope. From this also, it is necessary to make the glass thickness 12 to 13 mm or more when there is no support. Therefore, when one rod-shaped support body 53 is arranged in the central portion as shown in FIG. 7B, the glass plate 50 for the face plate is distorted as shown in the figure. In this case, a plate thickness of 10 mm or more can withstand atmospheric pressure. Next, as shown in FIG. 7C, a total of nine support bodies 53 are planted at the center portion of the support body 53 and the middle portion of the support frame 51 and at the same intervals on the left and right, and the deformation of the glass is further reduced, Glass over 4.5-5 mm thick can withstand atmospheric pressure.

However, even if the number of supporting means is further increased, the glass plate thickness cannot be proportionally reduced, and the number A of supporting means (arranged at equal intervals) by the device of FIG. As can be seen from FIG. 8 showing the relationship of the thickness t ₀ mm, the plate thickness of 2 mm was the limit against atmospheric pressure. Then, as shown in FIG. 8, if the relationship between the number A of supporting means and the glass thickness t is in the shaded area, it is possible to withstand atmospheric pressure.

As shown in FIG. 7C, the face plate 30
When the thickness t is set to t and the space between the supports 33 is set to P, and the ratio t / P is larger than a predetermined value, the deformation amount 1 of the face plate is almost eliminated, and there is no possibility of destruction due to deformation. When the ratio t / P becomes smaller than a predetermined value, the deformation amount 1 of the face plate becomes large, causing destruction. In order to resist the internal strain of the glass, it is necessary to prevent deformation so much, and it is necessary to secure the plate thickness of the glass to some extent. Table 1 shows the ratio t / P calculated from the experimental results of FIG. As is clear from Table 1, the ratio t / P needs to be 0.05 or more in order for the plate glass to withstand atmospheric pressure.

[0031]

[Table 1]

In the case of the 20-inch size mentioned above, when the screen is divided into 5 divided areas vertically and 5 divided horizontally, the number of intersections of each divided area is 16, and when the supporting means is arranged at each intersection, the number of supporting means is Will be 16. In this case, since the screen size is about 400 mm in width and about 300 mm in length, one divided area is about 80 mm in width and about 60 mm in length, and the interval P between the supports is about 70 mm in length and width. When t is 4 mm
/ P is 0.057, which means that it withstands atmospheric pressure sufficiently.

This means that the face plate size is 40
In the case of inches, when the face plate thickness is 4 mm, the spacing P between the supporting means may be 70 mm on average, and the number of supporting means is 81. In addition, the spacing P of the supporting means is twice that.
When set to 140 mm, the number A of all supporting means can be 16,
The glass thickness t in this case is at least 7 mm. The glass thickness and the number of supports can be selected in consideration of the total weight of the cathode ray tube, its own weight with respect to the face plate area, and impact resistance. That is, the weight reduction achieved by reducing the glass thickness of the face plate, the disadvantage that the number of supporting means must be increased, the weight increase of the face plate due to the increase of the glass thickness, and the atmospheric pressure drag force. Not only is it important to secure impact resistance.

In the embodiment shown in FIGS. 1 to 5, the aspect ratio is 3:
It has 4 20 inch size face plates,
The screen is divided into 5 parts in the horizontal direction and 4 parts in the vertical direction. Therefore, since there are 12 intersections and the rod-shaped support is arranged in this portion, the number is 12. Since the distance P between the supports is about 80 mm in the horizontal direction and about 75 mm in the vertical direction, the average
It has a pitch of 78 mm. Therefore, at a plate thickness of 4 mm, t /
Since P is 0.051, even if the thickness of the glass face plate is set to 5 mm in consideration of safety, it is possible to realize an envelope that is lightweight and has sufficient atmospheric pressure strength. Since the number of the supports is only 12, it is easy to manufacture, and the release of the occluded gas under vacuum is negligible, so that the life of the cathode ray tube display device is not deteriorated.

Further, in this embodiment, since the thickness of the face plate is 5 mm, the weight of the face plate is about
It is only 1.8 kg, which is considerably lighter than the weight of the face plate of the conventional tube of the same size is about 9 kg,
The weight of the entire display device is also very light.

As described in the above embodiments, according to the present invention, when forming a cathode ray tube having a flat glass face plate, the face plate has a thickness t of 2 mm or more, and the interval P between the rod-shaped supports is P. By setting t / P to be 0.05 or more, a stable and flat vacuum envelope can be secured. The number of supports is very small, and it has a great effect on the production and life of the tube, and the weight of the cathode ray tube can be reduced, making it easy to produce a highly practical flat cathode ray tube. Become.

Further, it is desirable to reduce the number of supporting means in view of the operation of the pipe, but since the peripheral edge of the face plate is supported by the side wall, the resistance against atmospheric pressure is large,
The supporting means adjacent to the side wall is slightly separated from the side wall and thickened in the central portion of the face plate which is easily deformed by the atmospheric pressure, whereby the number of supporting means can be reduced. Further, if the thickness of the face plate is increased, it is possible to reduce the number of supporting means. However, considering the weight of the face plate or the weight of the cathode ray tube, it is preferable that the plate thickness is as thin as possible. Anything over 15mm is not practical. Also, manufacturing by the float method becomes difficult,
Productivity will also deteriorate. Further, the effect of the present invention is remarkable when the plate thickness of the face plate is thinner than that of the conventional cathode ray tube having no supporting means, and it is desirable that the face plate thickness is 10 mm or less. Target.

Further, in the cathode ray tube in which the screen is divided and scanned by a plurality of electron guns as in the present embodiment, it is necessary to dispose the adjacent electron guns with a certain distance therebetween, and this interval (the central axis of the adjacent electron guns) is arranged. The distance) depends on the structure of the electron gun, but cannot be set to 15 mm or less, and when the supporting means is arranged at the intersection of the divided areas of the screen, the arrangement interval must be at least 15 mm or more. Therefore, in the case of this embodiment, considering the range of the plate thickness, t
If the upper limit of / P exceeds 1.0, it is difficult to realize, and in this embodiment, the effect is remarkable at 0.67 or less, and preferably 0.33 or less.

Furthermore, in this embodiment, the structure of the supporting means is rod-shaped with the tip being wedge-shaped, but the tip may be needle-shaped. However, since the internal strain intensively increases in the glass portion with which the needle-shaped portion contacts, it is not so preferable, and it is preferable to lengthen the tip in contact with the glass linearly. When the screen is formed of the three-color striped phosphor containing the striped black substance, the non-luminous portion of the support unit generated on the screen can be made inconspicuous by disposing the tip of the support unit on the black substance. However, the stripe width of the black material is at most 100 μm, and it is more difficult to accurately align the tip of the supporting means on the black material as the linear length of the contact portion, that is, the length in the longitudinal direction is increased. Further, considering that the tip of the supporting means is deformed and the screen is destroyed by the temperature change during operation, the linear length of the tip of the supporting means is shortened without being integrated with the tip of the supporting body adjacent in the length direction. Better.

Further, in the present embodiment, the structure in which the funnel and the neck are connected to the rear plate as shown in FIGS. 1 to 5 and the electron gun is provided in the neck has been described, but the present invention is limited to the above structure. Not a thing. That is, any structure can be applied as long as it is a structure in which two flat plates facing each other are supported by a supporting means. For example, in the case of a display device in which a line cathode and electrostatic deflection are combined, the electron gun structure as in the above embodiment. The lower limit of the distance between the supporting means can be further reduced, and as a result, the range of the value of the ratio t / P can be widened. The present invention may be appropriately set according to the structure of the display device to which the ratio t / P is applied. (Example 2)

Next, another embodiment of the present invention will be described when it is applied to a 20-inch display device. In this embodiment, the entire structure is the same as that of the first embodiment shown in FIGS. The distance between the face plate and the rear plate is 20 mm on the entire surface of the screen 30, and the length of the supporting means 31 shown in FIG. 9 is also 20 mm. The supporting means 31 is formed by machining a metal round bar with a diameter of 15 mm into a wedge shape.
31a has a width W of 0.05 mm, and a length L in the longitudinal direction of the tip is 15 mm, which is the same as the diameter of the metal round bar. The wedge-shaped tip portion 31a is in contact with the black stripe of the screen 30, and the width of the black stripe is 0.07 mm.

In this embodiment, the size of the phosphor screen 30 formed on the inner surface of the face plate 21 is about 400 mm × 3.
It is 00 mm, and the atmospheric pressure applied to this screen is supported by twelve support means 31.

Next, the examination result of the stress distribution of the face plate when the wedge-shaped tip portion 31a of the supporting means 31 which is the main part of this embodiment contacts the face plate 21 and the atmospheric pressure is applied will be shown.

The strength when the atmospheric pressure is applied to the face plate is the first factor determined by the plate thickness of the face plate glass and the arrangement interval of the supporting means as shown in the first embodiment, and the supporting means to be described later. There is a second factor that is determined by the shape and size of the tip. In the former, the face plate is deformed in a relatively large area due to atmospheric pressure, and this deformation causes stress in the compression direction on the outer surface of the face plate.
A stress in the tensile direction is generated on the inner surface, and the stress is destroyed when the stress (stress in the tensile direction) exceeds a critical value.
On the other hand, the latter is a breakage caused by stress in the tensile direction that is intensively generated in the glass near the tip of the supporting means when the face plate and the supporting means come into contact with each other.
In many cases, partial deformation of only one surface of the side (inner surface side) with which the supporting means is in contact is not accompanied by large deformation of the entire glass. In order to prevent the latter destruction, it is desirable to widen the area where the glass and the supporting means come into contact with each other and reduce the load amount per unit area to reduce the partial deformation amount. As described above, increasing the area of the tip of the supporting means has various problems and is difficult to realize. Therefore, the inventor of the present invention has found out an efficient shape of the tip portion of the supporting means by suppressing an increase in the contact area of the tip portion of the supporting means to a necessary minimum.

The stress generated intensively on a part (one surface) of the plate glass is determined by a computer simulation using the finite element method to find a contour line (isostress line) of the maximum stress in the vicinity of the contact between the supporting means and the plate glass. The state of stress concentration can be determined based on the degree of density of the contour lines.
In addition, particularly in this type of computer simulation, it is extremely difficult to accurately calculate the absolute value of the stress at the contact portion between the tip and the glass, and it is meaningless to evaluate the stress concentration and distribution. It was judged from the stress distribution near the contact area (relative value comparison). The state in which the glass breaks due to the concentration of stress means that high-value iso-stress lines are distributed at one point and at a dense pitch, and in this case, the plate glass has a certain length at the tip of the supporting means. Even if it has, it deforms as if it was loaded at one point. Therefore, it is possible to determine whether the plate glass is supported at one point or on a line having a certain area by observing the state of the iso-stress line.

The inventor has variously changed the length of the contact portion (the length in the longitudinal direction of the leading end of the supporting means) when supporting the atmospheric pressure applied to the plate glass on a line having a certain area by the above-mentioned method. The minimum required length was calculated.

In this simulation, when the width of the tip portion of the supporting means was 0.05 mm, the length L in the longitudinal direction of the tip portion was changed for calculation. 10 and 11 show stress distribution diagrams of this simulation. Longitudinal length L
There are 12 types from 0 (when supporting at one point) to 20 mm.

As is apparent from the stress distribution diagrams of FIGS. 10 and 11, the length in the longitudinal direction of the tip portion of the supporting means is as shown in FIG.
Less than 2 mm of (a), (b) and (c) (single point support,
In the case of 0.5 mm and 1 mm), it can be seen that the stress concentrates at almost one point (small area) 61, and the pitch of the iso-stress lines 62 is narrow, and the concentration is rapid. On the other hand, the length in the longitudinal direction is 2
The stress is gently distributed over a relatively large area from the time when it exceeds mm (Fig. 10 (e)). More specifically, 0 mm,
In the stress distribution charts for 0.5 mm and 1 mm, there is one iso-stress line with the highest stress value in the center of the part corresponding to the tip, and as a small circle, the length of the tip is about this level. Then, it can be seen that this supporting means operates in the same manner as the supporting means having the pointed tip. On the other hand, from the stress distribution diagram for the case of 2 mm, two equal stress lines of the same size appear in parallel at the part corresponding to the tip, and there is a tendency that the one-point concentrated stress is alleviated. In the stress distribution diagram of 3 mm, it can be seen that the concentration of the two isostress groups having a symmetrical distribution at the tip is completely divided.

Therefore, in order to effectively support the load due to the atmospheric pressure by using the supporting member having the wedge shape at the tip, the length of the tip of the supporting means in the longitudinal direction must be at least 2 mm or more. Further, the stress when the length in the supporting longitudinal direction is 2 mm or more becomes gentle with the length in the longitudinal direction as described above, and the absolute value of the stress also decreases as the contact area with the plate glass increases.

The inventor found out by the computer simulation that the minimum value of the length in the longitudinal direction of the tip of the supporting means for effectively supporting the atmospheric pressure is 2 mm, but considering practical and safety aspects. Then, it is desirable to set the tip length somewhat longer.

The computer simulation result shown in this embodiment is the case where the width of the tip of the supporting means is set to 0.05 mm, but the same result was obtained at least until the width of the tip is 0.5 mm. .

On the other hand, the length L in the longitudinal direction of the tip of the supporting means.
As the length is increased, it becomes difficult to process and assemble the member. Regarding the processing of the member, the parallelism of the tip is extremely important because the tip must be in contact with the surface of the glass sheet in parallel. 30 mm is the limit. Further, considering the forming accuracy of the plate glass, a member having a long length in the longitudinal direction of the tip portion is not preferable. Further, since it is necessary to dispose the tip portion on the black stripe for assembly, the positional accuracy and the parallelism between the black stripe and the longitudinal direction of the tip portion at the time of assembly are extremely important. Also,
The accuracy when assembling ordinary members in parallel is practically limited to 0.02 °, and if the tip of the supporting member exceeds about 30 mm, it becomes extremely difficult to assemble.

Further, in this embodiment, the tip end of the plate member of the support member is processed into a wedge shape from a relatively thick metal round bar, and the area to be connected to the rear panel is large, and the assembly is relatively easy and highly accurate. be able to.

As shown in FIG. 9, the supporting means of this embodiment has a rear plate side end 31b having a circular cross section and a face plate side end 31a having a wedge shape. As shown, the rear plate side has a plate-like supporting means 70.
Alternatively, needless to say, this is also effective in the case of a support 71 in the shape of a square member, or in the case where it is connected to a part of another member or another member, and the end portion on the face plate side is wedge-shaped and its end longitudinal direction. If the length is 2 to 30 mm, all the functions and effects of the present invention are exhibited. The present invention is also applied to the case where some or all of the plurality of support members are integrated. Further, although the metal is used as the material of the supporting member in this embodiment, the present invention can be applied to the case of using a glass material, ceramics or the like.

Although the present embodiment describes a cathode ray tube having a neck containing a plurality of electron guns, the present invention is not limited to the above structure, and a supporting means is provided between two opposing flat plates. It is needless to say that it can be applied to any supporting structure, for example, a display device in which a line cathode and electrostatic deflection are combined. (Example 3)

Another embodiment will be described with reference to FIGS.
A structure similar to that of the first embodiment shown in FIG.
In this embodiment, as shown in FIG. 4, a flat glass material having a substantially rectangular opening 27 at a predetermined position is used as the rear plate. There are a method of spraying with high pressure air or high pressure water, a method of cutting by laser, a method of using ultrasonic waves, a method of using a grindstone, etc., and they can be processed relatively easily at room temperature. It is also possible to use a secondary molding method in which the glass is heated above the softening point of the glass to be formed, or it can be processed by press molding.

Further, the face plate 21, the rear plate 23, and the side wall 22 are all processed from glass plates of the same thickness and the same material, and the funnel 24 is formed by the blow method. Further, the neck 25, the funnel 24 and the side wall 22 and the quadrangular side are heat-welded to bond the respective members, and frit glass is used for the other parts.

Thus, one face plate, four
One side plate, one rear plate, many funnels and necks all made of glass plates eliminates the need to use a curved face plate or rear plate as in conventional cathode ray tubes, and makes the display shorter. A device can be provided.

Further, since the atmospheric pressure is supported by using the supporting means 31, sufficient strength can be obtained even with a relatively thin glass material having a thickness of 4 mm to 15 mm, in view of weight and strength. The weight is much lighter than Further, by providing the supporting means 31, the deformation of the plate due to the atmospheric pressure can be made extremely small, and the amount of the deformation is zero in the portion where the supporting means is provided and the center of each divided scanning area is maximum. The deformation amount is distributed almost symmetrically with respect to the center, and the electron gun arranged on the extension line of this deformation center does not tilt the central axis of the electron gun even after deformation, It is possible to keep the axis perpendicular to the screen surface at all times. Therefore, a structure which is not affected by the deformation of the envelope due to the atmospheric pressure, which cannot be realized by the conventional cathode ray tube having no supporting means, can be realized, and an extremely high-quality and stable image can be reproduced. In the display device of the present invention, the supporting means must be arranged on the boundary line of each divided scan which does not generate a shadow or reflection by the supporting means even if the electron beam is deflected and scanned.

In the present embodiment, by using the supporting means as described above, the deformation of the envelope due to the atmospheric pressure can be made extremely small, and at the same time, the distribution of the deformation in each divided scan area can be made almost equal to the center of the area. This can be made symmetrical, and as a result, the central axis of the electron gun can be arranged perpendicular to the phosphor screen in any region. This is an extremely great advantage for a cathode ray tube having an electron beam generator on the rear plate.

Further, since the distance between the electron gun and the phosphor screen can be shortened relatively easily, the magnification of the electron lens can be reduced and a high resolution image can be displayed easily. Also,
Since the structure of the present invention uses glass for the rear plate, it is easier to make the space through which the electron beam passes a high-potential equipotential space as compared with the case where a metal plate is used. It is not necessary to electrically insulate the entire plate. Further, mutual interference of the magnetic fields of the adjacent deflecting devices via the metal plate can be avoided, and the influence of the magnetization of the metal plate is eliminated.

Further, in this embodiment, a plurality of rectangular openings 27 are provided at predetermined positions on the rear plate 23. This aperture 27 does not necessarily have to be rectangular, but in order to reduce the power consumption of the deflection yoke attached to the outer wall of the funnel 24 connected to this aperture, this aperture shape should be the outermost orbit of the electron beam as much as possible. A shape close to (raster shape) is desirable. In the present invention, the flat rear plate is provided with an opening, and the funnel and neck are connected to the opening, so that the power consumption of the deflecting device can be greatly reduced due to the thinning of the funnel glass, which is impossible with the conventional cathode ray tube. However, the power consumption is further reduced by using the above-mentioned rectangular opening. In addition, in the present embodiment, in addition to these power consumption reduction methods, by tilting the aperture, the distance between the electron beam passing through the outermost part of the aperture and the glass wall surface is shortened, and further, A small size and low power consumption of the deflection device can be realized. Further, mutual interference of magnetic fields generated between the adjacent deflecting devices can be reduced, which is an extremely great advantage. In addition, there is an advantage that a wide space for arranging the internal structure such as the supporting means can be secured.

Although the rear plate, the fennel, and the neck are separately molded and sealed together in this embodiment, the present invention is not limited to this.
It is also possible to integrally mold the rear plate, fennel, and neck. (Example 4)

The present embodiment also has the same overall structure as the above-mentioned embodiments. Also in the present embodiment, as shown in FIGS. 1 to 5, a rod-shaped support 31 is arranged between the face plate 21 and the rear plate 23 as a support means. The tip end 31a of each rod-shaped support is formed in a wedge shape, and the base portion 31b is fixed near the funnel joint portion of the rear plate 23. Since these supports support the face plate and the rear plate from the atmospheric pressure, it is necessary to have a certain contact area because it is necessary to minimize the glass distortion in the contact portion with the glass. The wedge shape is one of the means, and it is arranged in either direction of the screen. When the screen is a color cathode ray tube screen in which a stripe-shaped light absorbing material is arranged between stripe phosphors, it is preferable to arrange wedge-shaped tip portions in the vertical direction along the stripe-shaped light absorbing material.

The size of the phosphor screen 30 formed on the inner surface of the face plate 21 is about 400 mm × 300 mm,
The atmospheric pressure applied to this screen is supported by 12 supporting means 31. The tip of the rod-shaped support 31 is in contact with the intersection 32 on the boundary line of the divided areas R1 ... Of the screen shown in FIG. 5, and the total number is 12.

As described above, in the vacuum envelope, a strong atmospheric pressure acts on the entire envelope. If the number of supports is increased in order to support this atmospheric pressure, it will be more stable, but this is not preferable in terms of mass production, and it is difficult to process the stored gas and the life characteristics are deteriorated.

As described above, the strength when the atmospheric pressure is applied to the face plate is the first factor determined by the plate thickness of the face plate glass and the arrangement interval of the supporting means, and the shape and size of the tip of the supporting means. Second decided by the size
There is a factor of. In the former, the face plate is deformed in a relatively large area due to atmospheric pressure, and due to this deformation, a stress in the compression direction is generated on the outer surface of the face plate and a stress in the tensile direction is generated on the inner surface. Is destroyed when it exceeds the critical value. On the other hand, the latter is
When the face plate glass and the supporting means come into contact with each other, the destruction occurs due to the stress in the tensile direction concentrated on the glass in the vicinity of the tip of the supporting means. Generally, the supporting means comes into contact with each other without causing a large deformation of the entire glass. Often due to partial deformation of only one side (inner side). Therefore, by appropriately determining both the plate thickness of the face plate glass, the arrangement interval of the supporting means, and the shape of the tip of the supporting means when the face plate glass and the supporting means are in contact with each other, it is possible to prevent both of the above-mentioned destruction factors. And a display device having sufficient strength can be provided.

In this embodiment, since the thickness of the 20-inch size face plate having an aspect ratio of 3: 4 is 5 mm, the weight of the face plate is only about 1.8 kg, which is the same as that of the face tube of the conventional tube of the same size. The weight of the cathode ray tube is much lighter than the weight of about 9 kg, and the total weight of the cathode ray tube is also very light.

Further, the screen is divided into 5 parts in the horizontal direction and 4 parts in the vertical direction. Therefore, there are 12 intersections 32 of the divided regions R1 ... Of the screen shown in FIG. 5, and since the rod-shaped support is arranged in this portion, the number is 12. The space P between the supports is about 80 mm in the horizontal direction and about 75 mm in the vertical direction.
Therefore, the average pitch is 78 mm. Therefore, t
/ P is 0.064.

Further, the face plate 21 and the rear plate
The interval of 23 is 20 mm on the entire surface of the screen 30, and the length of the supporting means is also 20 mm. Support means 31 is machined to diameter 15
The tip of a metal round bar of mm has a wedge shape, and the wedge-shaped tip 31a has a width W of 0.05 mm and a length L in the longitudinal direction of the tip is 15 mm, which is the same as the diameter of the metal round bar. The wedge-shaped tip portion 31a is in contact with the black stripe which is the light absorbing layer of the screen 30, and the width of the black stripe is 0.07 mm. Since the number of supports is only 12, it is easy to manufacture, and the release of the stored gas under vacuum can be neglected, which does not cause the deterioration of the life of the cathode ray tube.

From the results of simulation conducted by the inventors, when forming a display device having a flat glass face plate, the face plate thickness t is set to 2 mm or more, and the interval P between the rod-shaped supports is t / P of 0.050. By setting as described above, the face plate is deformed in a relatively large area by the above-mentioned atmospheric pressure, so that the compressive stress is generated on the outer surface of the face plate and the tensile stress is generated on the inner surface. Sufficient strength can be given to the first cause of failure, which is caused when stress (especially stress in the tensile direction) exceeds a critical value. Furthermore, the tip shape is a wedge shape, and the length of the tip in the longitudinal direction is long. By using the supporting means in the form of a wedge having a width of 2 mm or more, the pulling method that occurs intensively on the glass near the tip of the supporting means when the face plate glass and the supporting means contact each other Sufficient strength can be given to the second fracture factor caused by the directional stress. Then, by combining these, it is possible to secure a flat vacuum envelope that resists the first and second destruction factors and effectively supports the atmospheric pressure. The number of supports is very small, and it has a great effect on the production and life of the tube, and the weight of the cathode ray tube can be reduced, making it easy to produce a highly practical flat cathode ray tube. Become.

The details of the simulation are similar to those shown in the first and second embodiments. Although it is desirable to reduce the number of supports in order to operate the pipe, the peripheral edge of the face plate is supported by the side walls, so that the resistance against atmospheric pressure is large. Collect in the center of the face plate that is easily deformed by
This can reduce the number of supports.

Although it is possible to reduce the number of supporting means by increasing the plate thickness of the face plate, it is desirable that the plate thickness is as thin as possible in consideration of the weight of the face plate or the cathode ray tube. Thickness is 15
Those exceeding mm are not practical, and the production by the float method becomes difficult, and the productivity becomes poor. Further, the effect of the present invention is remarkable when the plate thickness of the face plate is thinner than that of the conventional cathode ray tube having no supporting means, and it is desirable that the plate thickness is 10 mm or less. Light weight and practical.

Further, in the cathode ray tube in which the screen is divided and scanned by a plurality of electron guns as in the present embodiment, it is necessary to dispose the adjacent electron guns to some extent. The distance) depends on the structure of the electron gun, but it cannot be 15 mm or less, and when the support means is arranged at the intersection on the boundary of the divided areas of the screen, the distance between them must be at least 15 mm. is there.

Therefore, considering the range of the plate thickness, it is difficult to realize the ratio t / P having an upper limit of more than 1.0. In the case of this embodiment, the effect is remarkable at 0.67 or less.
It is preferably 0.33 or less.

Further, the length in the longitudinal direction supporting is 2 mm.
As described above, the stress in the above case becomes gentle along with the length in the longitudinal direction, and the absolute value of the stress becomes smaller as the contact area with the plate glass increases, but the length L in the longitudinal direction of the tip of the supporting member is reduced. The longer the length, the more difficult it becomes to process and assemble the member.

Regarding the processing of the member, the parallelism of the front end is very important because the front end must come into contact with the surface of the plate glass in parallel. 30mm is the limit for mass production. Further, considering the forming accuracy of the plate glass, a member having a long length in the longitudinal direction of the tip portion is not preferable. Further, regarding the assembling, since the tip portion must be arranged on the black stripe, the positional accuracy and the parallelism between the black stripe at the time of assembling and the longitudinal direction of the tip portion are extremely important. In addition, the accuracy when assembling ordinary members in parallel is practically 0.02
There is a limit of °, and if the tip of the supporting member exceeds about 30 mm, assembly becomes extremely difficult. Therefore, in the present embodiment, it is set to 15 mm in consideration of the area of the non-light emitting portion, the workability of the member, and the like.

Further, in this embodiment, the end portion of the plate material of the supporting member is not processed into a wedge shape but is processed from a relatively thick metal round bar, and the area to be connected to the rear panel is large, and it is relatively easy and It can be assembled with high precision.

Further, the present embodiment has described the structure in which the electron gun as the electron source is enclosed inside the neck connected to the second plate so as to face the small area to be divided and scanned. However, the relationship between the distance between the supporting means and the plate thickness of the face plate and the shape of the tip of the supporting means are not limited to those of the above structure. That is, supporting means is arranged between the face panel to which the phosphor screen is attached and the rear panel facing the face panel to support the phosphor screen at a predetermined interval, and the phosphor screen is divided into a plurality of small areas by a plurality of facing electron sources. It is extremely effective for a display device of the type that performs divided scanning. Therefore, when the present invention is applied to the display device in which the line cathode and the electrostatic deflection are combined, the lower limit value of the supporting means interval by the electron gun structure as in the above embodiment can be further reduced, and as a result, the ratio t The range that the value of / P can take is wide. That is, the ratio t / P may be appropriately set according to the display device to which the present invention is applied.

[0080]

As described above, according to the present invention, a screen which is divided and scanned into a plurality of regions has an integrated structure, a flat plate glass is used for a face plate having the screen, and a side wall connected to the face plate. The flat plate glass is also used for the rear plate, which is parallel to the face plate and to which the funnel and neck are connected, and the supporting means are provided in a predetermined relationship between the flat plate glasses, so that the vacuum envelope of the flat face rate can be achieved with a small number of supporting means. Can be formed. Also, since the face plate and rear plate are flat and the distance between each electron gun and the screen can be set to a minimum, the electron lens magnification of the electron beam can be reduced, and the spot on the screen can be made smaller, resulting in a high resolution image. To form. The depth is shortened, the weight is reduced compared to the area of the screen, and the screen provides an easy-to-see image.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a cathode ray tube display device according to the present invention.

FIG. 2 is a schematic cross-sectional view of FIG. 1 taken along line AA and viewed in the direction of the arrow.

FIG. 3 is a schematic cross-sectional view of FIG. 1 taken along line BB and viewed in the direction of the arrow.

FIG. 4 is a schematic perspective view showing an exploded main part of the display device shown in FIG.

5 is a plan view showing a screen of the display device shown in FIG. 1. FIG.

FIG. 6 is a cross-sectional view of a vacuum device for examining the yield strength of the glass face plate against atmospheric pressure.

FIG. 7 is a schematic cross-sectional view showing deformation of a glass face plate.

FIG. 8 is a characteristic diagram showing the relationship between the number of supporting means and the thickness of the glass face plate according to a simulation of the present invention.

FIG. 9 is a perspective view showing the shape of the supporting means of the present invention.

FIG. 10 is a stress distribution diagram obtained by simulating a stress distribution of glass due to contact of supporting means.

FIG. 11 is a stress distribution diagram obtained by simulating a stress distribution of glass due to contact of supporting means.

FIG. 12 is a perspective view showing another example of the supporting means of the present invention.

13A and 13B are views showing a conventional cathode ray tube, in which FIG. 13A is a perspective view and FIG. 13B is a sectional view.

FIG. 14 is a partially cutaway cross-sectional view showing another conventional display device.

15 is a partially enlarged cross-sectional view of the display device shown in FIG.

FIG. 16 is a schematic diagram illustrating a state in which the support means of FIG. 14 is in contact with the screen.

FIG. 17 is a schematic view for explaining a modification of the supporting means shown in FIG.

[Explanation of symbols]

21 ... Face plate 22 ... Side wall 23 ... Rear plate 26 ... electron gun 30 ... screen 31 ... Supporting means 31a ... Tip of support means t ... Face plate thickness P ... Space between supporting means W ... Width of the tip L: Length in the longitudinal direction of the tip

Claims (3)

[Claims] 1. A flat first plate having at least a substantially rectangular shape, a side wall extending from a peripheral portion of the first plate in a direction substantially perpendicular to the first plate, and the first plate. A vacuum envelope including flat second plates facing each other and substantially parallel to each other, a phosphor screen attached to an inner surface of the first plate, and a plurality of phosphor screens. A plurality of electron sources for generating an electron beam for divided scanning in a small area, and a plurality of supporting means provided between the first plate and the second plate for supporting these plates at predetermined intervals. At least, the display device is characterized in that the ratio t / P is 0.05 or more, where t is the thickness of the first plate and P is the distance between the supporting means. 2. A flat first plate having a substantially rectangular shape,
A side wall extending from a peripheral portion of the first plate in a direction substantially perpendicular to the first plate; and a flat second plate arranged to face the first plate and substantially parallel to each other. A vacuum envelope, a phosphor screen attached to the inner surface of the first plate, and a plurality of electron sources for generating electron beams for scanning the phosphor screen in a plurality of small areas. , At least a plurality of supporting means provided between the first plate and the second plate for supporting the plates at a predetermined interval, and the end portion of the supporting means on the first plate side has a wedge shape. None Display device characterized in that the length of the wedge-shaped end portion in the longitudinal direction is 2 mm to 30 mm. 3. A first plate having a substantially rectangular flat shape,
A side wall extending from a peripheral portion of the first plate in a direction substantially perpendicular to the first plate and a plurality of apertures arranged substantially parallel to each other facing the first plate are provided. A flat second plate; a plurality of supporting means provided between the first plate and the second plate for supporting these plates at a predetermined interval; and a plurality of openings of the second plate A vacuum envelope consisting of a funnel connected to each of the above, and a neck extending from the funnel, and a phosphor screen attached to the inner surface of the first plate, and enclosed in each of the necks. An electron gun as an electron source, the phosphor screen is divided and scanned into a plurality of small areas by electron beams from the plurality of electron guns, and the plurality of supporting means are arranged on the boundary line of the divided scan. position Display device comprising has.