JPS5999647A - Cathode ray tube for projecting television and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention comprises a luminescent screen comprising a support with a luminescent material, the support with luminescent material having cells filled with luminescent material, the cells extending into the support. It is formed as a plurality of adjacent tubes and the walls of the support are reflective. One of the desirable characteristics of cathode ray tube screens is the ability to obtain large brightness, which is particularly desirable in the case of projection television tubes. It is known that increasing the brightness of a cathode ray tube increases the thickness of the luminescent layer that forms its screen, and at the same time increases the energy of the electron beam that bombards this luminescent layer (beam current or increase the acceleration voltage). However, increasing the brightness in this known manner simultaneously increases the diameter of the spot on the screen. This is due to the natural diffusion of light generated in the light emitting layer. Furthermore, as described above, when the diameter of the spot increases, the contrast of the reproduced image is greatly reduced, and its resolution is also degraded.

Furthermore, the electron impact on the light emitting layer is accompanied by heating of this layer, which limits the brightness, and therefore, as the beam energy increases, the radiation of heat increases. On the other hand, the emission characteristics of light generally exhibit characteristics that decrease as the humidity of the luminescent material increases. This decrease in brightness as a function of temperature ΔL is given, for example, by the relative value T shown in FIG. This announcement was made in Chicago on June 4, 1979, when Sony Corporation announced an I.I.
EEE Spring Conn. 7 Ellen, ', to which reference is made in the following description of the invention.

A cathode ray tube of the above type according to the present invention is disclosed in US Pat.
9o6. AA4, in which a flat screen for cathode ray tubes is proposed. The screen is described as having a tubular cavity with a longitudinal axis perpendicular to the projection window, which is filled with a luminescent material. The walls of this cavity are opaque or have reflective properties, thereby preventing sideways leakage of light. By such means, it is possible to increase the thickness of the luminescent material layer, thereby increasing the energy and brightness of the electron beam,
In this case the contrast can do this without reducing resolution. Furthermore, although it is not a direct object of the present invention, the above-mentioned known structures allow good heat dissipation through the projection window to be achieved. This heat is generated within the luminescent material layer by electron bombardment. The greater the contact area of the particles of luminescent material with the projection screen, the easier this dissipation of heat becomes. When a small cavity is filled with a luminescent material, if the luminescent material is brought into contact with the wall of the cavity, the contact area will be further increased.

Accordingly, this structure limits the temperature rise of the luminescent material and the accompanying reduction in brightness.

However, the above-mentioned known structures have several drawbacks. When the electron beam is at a large angle to the axis of the tubular cavity of the screen, the electrons in the impinging electron beam will only absorb a small portion of the luminescent material due to the presence of the walls of the cavity mentioned above. No shock. A significant portion of the luminescent material is hidden within the void and is not bombarded by electrons. As a result, the luminescent material is not uniformly bombarded with electrons on the surface of the screen, so that the luminescent material in many of the tubular cavities nf is not fully utilized. Therefore, resolution, contrast and maximum image brightness are not uniform over the entire surface of the screen. If too much heat is generated, heat dissipation will not be sufficient. This tendency is particularly noticeable in cathode ray tubes for projection televisions.

The object of the invention is to obtain a 8yim tube which increases the brightness of the image even in the case of uneven screens, such as convex or concave screens, without reducing resolution or contrast. Another object of the invention is to provide a cathode ray tube of this type with uniform resolution, contrast and maximum image brightness over the entire surface of the screen.

Still another object of the present invention is to prevent the temperature of the luminescent layer from increasing by diffusing the heat generated in the luminescent layer of the screen, and to improve the brightness of the screen by preventing the luminescence of this layer from being attenuated.

Therefore, the luminescent screen of the cathode ray tube according to the invention is characterized in that the axes of the cells provided in the screen converge substantially toward the center of deflection of the cathode ray tube.

In a first embodiment of the invention, the screen is operated in transmissive mode. That is, the light produced by the luminescent material is emitted through the support. In this case, the support is provided with two light-transmitting glass plates, which are parallel to each other and parallel to the support, forming a double wall of the cathode ray tube case.) The cells of the screen are placed on the inner wall. The cells are placed inside the tube and coated with a metal coating. This film shall be transparent to the electrons of the electron beam and reflect light. The double wall is provided with an inlet and an outlet for passing a refrigerant between the two glasses of the double wall.

As a modification of the first embodiment, the side of the support that is scanned by the electron beam is made flat or convex. In this case, the cell walls have a high thermal conductivity, in particular they are metal.

In a second embodiment, the screen operates in reflective mode.

In this case, the support is opaque, each cell of the screen is transparent on the side where the electron beam strikes the screen, the cathode ray tube is provided with an optical device for projecting the image, and the support cools the screen. A cooling device should be provided for this purpose.

In a modification of the second embodiment, the side of the screen and support that is impacted by the electron beam is flat or convex.

It is advantageous for the walls of the cell to have a high thermal conductivity, especially if they are metal.

In this last-mentioned embodiment, the associated optical system is centered on the axis of the tube, and a concave mirror facing the screen is provided, and a correction plate is placed behind the screen to correct the distortion caused by this concave mirror. and configure it.

The invention further relates to a method for manufacturing a cathode ray tube of this type.

In this, a luminescent screen has a pattern of tubular cells filled with a luminescent material, and has a cell pattern whose axes converge approximately to the same point on the axis of the screen. A method for manufacturing a luminescent screen for a cathode ray tube deposited on a support, comprising the following steps: - forming an outline wire on one side of the screen which is electrically conductive or coated with an electrically conductive layer; The first one is sensitive to radiation.
applying a layer of lacquer and matching the thickness of this first layer to the desired dimensions of the cells of the screen; - drying and polymerizing said first layer of lacquer; - applying a white layer on said first layer of lacquer; applying a second layer sensitive to light or monochromatic light; - applying an image of a pattern formed in the form of a mask of large dimensions onto said second layer by applying white light or monochromatic light to an optical system with a magnification of less than 1; projecting by a projection system and forming this pattern by the magnification of the optical system, the pattern having figures corresponding to the holes of the cells on the screen surface; - developing the second layer exposed in this way; forming as described above by means of a uniform electrophoretic line radiation source located on the axis of the support and at a position opposite to the mask from said first lacquer layer at the center of deflection of the electron beam; - exposing the first lacquer layer through a mask, - developing, drying and heating the thus exposed first lacquer layer; - the perforated parts of the lacquer of the first lacquer layer. - growing a metal wall or an electrically insulating material wall; - dissolving the remaining resin; and - filling the formed cell with a luminescent material. shall be.

In a variant of the manufacturing method, metal walls are grown in the cavities of the first lacquer layer by electrolytic growth. In this case, an electrode parallel to this surface is arranged between the electrically conductive surface of the support and the free surface of the first lacquer layer, and an electric field is applied therebetween for transporting the metal.

Furthermore, in another variant of the manufacturing method, walls of insulating material are grown in the cavities of the lacquer of the first lacquer layer by electrophoresis or anaphoresis, in which case the transport of particles of the insulating material is This is done by the electrostatic force of an electric field applied between the support of the screen and an electrode placed parallel to the play surface of the first layer of lacquer, and after this growth is sintered at high temperature, its mechanical Increase strength. The material forming these walls is, for example, S
iO□, kl, 08. MgO or B as particularly improving thermal conductivity. There is 0.

A further alternative is to make the support of the screen itself photosensitive, exposing it to the extraneous radiation and providing holes in it; in this case there is no need to cover the extraneous radiation with a layer of photosensitive lacquer. An example of a material used in such a method is photosensitive glass, and cells can be formed directly within this edge metal support without forming cell walls by electrolysis or other means, but otherwise in the same manner as described above. I can do it. The present invention will be described with reference to the following drawings in which the point on which the axes of the cells converge is on the axis of the screen and coincides with the deflection center of the scanning electron beam of the cathode ray tube when the screen is mounted on the cathode ray tube.

ΔL FIG. 1 is a diagram showing how the relative brightness T of a layer of luminescent material varies as a function of temperature. When the temperature is 80° C., the brightness decreases to 50%. Therefore, it can be seen that in order to obtain high brightness, it is necessary to dissipate the thermal energy generated in the luminescent material by electron bombardment.

FIG. 2 is a cross-section through the plane of symmetry of a known cathode ray tube with a flat screen. Reference numeral 11 designates the envelope of the tube, which has a neck portion 18 and a cone portion 12. An electron gun and a deflection device are disposed within the neck portion 18, but illustration thereof is omitted. The electron beam is indicated by 10. This electron beam 10 is formed by an electron gun, and after being deflected, it appears to be emitted from point A, which is defined as the center of deflection of the cathode ray tube. The electron beam is incident on a screen 14 deposited on the wall of the outer casing 11 of the cathode m-tube.

In a known example disclosed in US Pat. No. 2,996,684, the screen 14 has cells in the form of narrow tubes. For simplicity of illustration, eight cells 15, 16, 17
Only shown. In an actual screen, a large number of extremely thin tubular cells of this kind are arranged inside a cathode ray tube in a shielded manner so as to cover the entire surface of the screen. The axes 1g and 19.21 of these tubular parts are parallel to each other,
It is also parallel to the axis of the cathode ray tube (shown coinciding with axis 21). The cross section of the tubular part of these cells is made approximately equal to the cross section of the scanning beam 1o on the screen. The paths of these electron beams are formed by connecting points A, but the angle varies depending on the position of the path. Those that pass close to the tube axis make a small angle to the tube axis, while those that pass near the tube axis The more you do it, the bigger the angle will be.

For example, when an electron beam passes through a small-angle electron path 22 that includes the tube axis, the electrons penetrate deep into a cell filled with luminescent material, causing almost all of the luminescent material in the cell to emit light. In contrast, with an electron beam passing through a path located outside the tube, as shown for example at 2B, the electrons pass only through the surface portion of the cell, causing only a small portion of the luminescent material within the cell to emit light. In other words, the luminescent material at the position indicated by the hatched area 24 is not subjected to electron bombardment. Therefore, the amount of excited luminescent material varies depending on the deflection angle of the electron beam, and therefore, the luminescence intensity differs depending on the local position of the screen.

Figure 18 shows a negative 8ii tube according to the invention. In FIG. 8, the elements 10, 11t12, 18 and the shaft 21 are the same as those shown in FIG. However, the screen 14 deposited on the inner wall of the tube casing 11 has a structure different from that of FIG. This screen 14 also has cells filled with luminescent material in the form of adjacent juxtaposed tubes of small diameter. To simplify the drawing, only the 8m cell 2z and 28.28 are not shown.

The electron beam is deflected in eight directions as shown at 24.25.26. The tubular portion of the cell has a conical or cylindrical shape with axes at 21°27.29°, and both of these axes are oriented so as to pass approximately through point A, which is the center of deflection. In this way, all the luminescent materials within the replacement part are excited by electron bombardment. Furthermore, this luminescent material needs to be cooled. For this purpose, the outer casing of the cathode ray tube is provided with a double wall 81, inside which an inlet 3 is provided in the tube.
FIG. 4 shows a projection television cathode ray tube having a convex screen for cooperation with an optical projection system. In FIG. 4 as well, the elements 11, 12, 13 or tube axis 21 shown in FIG. 2 are indicated by the same numbers. The screen 41 in this example has a convex shape and is provided on the support 40. Like the previous embodiment, this screen also has cells filled with luminescent material. To simplify the drawing, only eight cells, indicated at 42°43.44, are shown, which have small tubular sections of truncated conical or cylindrical shape, and whose 1llll 45 , 21 *47 almost passes through the position of point A, which is the center of deflection. The electron beam impacting these cells is shown at 85°36.37. The cross section of these scanning beams at the convex surface directly in front of the screen of each tubular part of these cells is approximately equal to the cross section of each said tubular part in the same plane. By doing so, the luminescent material within the tubular portion of the cell can be excited to the maximum, as in the first embodiment described above.

This cathode ray tube is partially shaded! It has an optical projection thread on the outside of the FI-ray tube, which projects the image of said convex surface 48. This optical system is, for example, a known Schmitt optical system, which consists of a concave mirror 49 provided on the inner wall of the cathode ray tube and a chromatic aberration reducing pressure provided on the outside of the tube. It has a correction plate 5o for.

Further, as in the first embodiment, this screen is also provided with a cooling device. This cooling device has a double-walled cooling liquid circulation system having a plate-shaped screen support 40 and a wall 51 watertightly welded to the periphery of the support 4o, and the cooling liquid is supplied and discharged. This is done through the tubes 52 and 58 that protrude outward from the tube casing.

FIGS. 5 and 6 are diagrams showing a method of manufacturing a screen for a cathode ray tube according to the present invention. This manufacturing method will be explained for the case of a convex screen. However, this method is equally applicable to flat screens. FIG. 5 shows a support 40 similar to that shown in FIG. 4 and a similar coolant circulation system. The screen is provided on the convex surface 61 of the support 40. Since the material of this support has a high thermal conductivity, the thermal energy generated in the screen by electron bombardment can be dissipated without any problem.

In the first example of the manufacturing method described below, since the surface 61 of the support body 40 needs to be electrically conductive, the material of the support body 40 is made of a metal or a non-metallic material. If so, its surface 61 is coated with a conductive layer.

In the first step of this method, a mask with little deformation and high resolution is formed on the above-mentioned convex surface 61 concentrically with this surface. The mask shall have transparent and opaque portions in a mosaic-like geometry corresponding to the screen surface 48 shown in FIG. To manufacture such a mask, a distance equal to the distance between surface 61 and surface 48 is applied to the upper side of surface 61 by a known transfer method.
) %f A diagonal mask is formed. The manufacturing method using such mask transfer includes the following steps.

- a first lacquer layer 41 sensitive to heavy radiation on the support plate 4;
Deposit on 0. This can be hardened or applied using centrifugal force to a thickness equal to the depth of the cells of the desired layer.

That is, it is provided between surfaces 61 and 48 in FIG. Its thickness is for example between 4-20 μm.

- After drying and bottling the first lacquer layer 41, a second lacquer layer 62 sensitive to white or monochromatic light is provided thereon.

- exposing an image of the desired pattern to the photosensitive surface on said second lacquer layer 62 using suitable optics; The desired pattern is produced by transfer from a larger size mask.

The optical projection system used in the embodiment shown in FIG. 4 can therefore be used for this cathode ray tube, and has a reflecting mirror 49 and a correction plate 50. The screen support 40 is placed in the same relative position to the optical system as in the completed cathode ray tube.

- When the layer 62 is developed, a mask is formed on the resin layer 41, and a Lepuno force is formed on the convex surface, which is only deformed (as compared to the original mask G). The opaque and transparent parts of this mask shown in FIG.
This is shown in part 9.

A source 80 (e.g. a single arc mercury vapor lamp) producing uniform heavy radiation is then placed at point A (see FIG. 8), which should be the center of deflection of the electron path of the cathode ray tube. The layer 41 sensitive to heavy radiation is exposed through a mask. This gravity beam provides exposure through the entire thickness of the lacquer layer 41 in the same direction as the electron path travels in the tube during one operation. In FIG. 6, the acting heavy ray radiation is shown in the form of beams of 81 and 82.83184, respectively. The exposed and unexposed parts of the lacquer layer are 85, 86, 87, 88 and 89 respectively.
, 90.

91.92.98.

- Perform a development step to remove the lacquer in exposed areas 85-88 and expose the metal support 4+O.

- After drying and heating, in the first example the entire assembly is placed in an electrolytic bath and supported on the wall of the section 85-88 in which the tubular section is formed, as shown in FIG. Starting from body 4o, a metal layer is grown by electrolysis. The resin, which has electrically insulating properties, does not interfere with the 11 field distribution in the electrolytic bath and mechanically limits the growing wall geometry.

- stopping the electrolytic action when the formed layer reaches the level of the surface 48; At the locations of the resin portions 85-88 dissolved and removed in this manner, a metal lattice-like portion is formed on the support 40 and forming the cell wall. According to this method, the axis of each cell produced is the final shade i.
The electrons are directed to point A, which is the center of deflection of the electron path in the ray tube. This is a condition for receiving the maximum impact with the same intensity when the luminescent materials filling these cells are bombarded with an electron beam of the same electron density.

The upper cells of the support 40 thus formed are filled with a luminescent material by a known method. In other words, when the luminescent material has a particle structure, it is filled by the action of centrifugal force,
It can also be produced by epitaxial growth from the vapor phase, by cathode sputtering or plasma sputtering, or by using an atomic solution when a solid structure is required. After forming the sections 85-88, by placing an electrode parallel to the surface 48 between point A and the surface 4B and applying an electric field between this electrode and the support 40 of the screen, these tubular shapes are formed by electrostatic force. Part 8
5-88 is coated with an insulating material by electrophoresis (or anaphoresis). In order to increase the mechanical strength of the walls formed, these filling insulations are sintered at high temperatures after they have grown. Next, the same steps as in the first embodiment are additionally performed. The material forming the wall portion is 5in9°Al2O
2, MgO, and Boo et al. which further improves thermal conductivity.

In other variations, the screen support 40 does not need to be electrically conductive. This may be thicker than the one in FIG. For example, it can be as thick as layer 41 and made of a material that is itself sensitive to extraradiation. It is thus not necessary to cover it with a single layer of lacquer that is sensitive to extraneous radiation. Such a material is, for example, photosensitive glass. After forming a mask on this glass that projects the gravity rays to the location corresponding to the hole of the desired cell, the mask is exposed to the gravity rays emitted from the same single light source as described above. The exposure is then carried out in the same manner as described above, but in this case there is no need to grow the cell walls by electrolytic or other methods as the cells are formed directly in the support.

The cathode ray tube according to the invention has two important characteristics after completion.

One is to have layered optics that pick up the light produced by the luminescent material during operation.

Second, the cathode ray tube is equipped with an electron gun that generates an electron beam, but the electron beam is considered to be convergent with respect to point A, which is the beam deflection center. In order to form a tube, the manufacturing process is carried out sequentially to satisfy these characteristics for the manufacture of the tube screen itself. That is, even in the manufacturing process, an optical system compatible with the completed cathode ray tube is used to eliminate causes such as chromatic aberration, deflection error, focus error, etc. that may interfere with the image of the completed optical system.

A supplementary explanation of the present invention will be given below.

The manufacturing process varies somewhat depending on whether the cathode ray tube is operated in reflection or transmission mode. This will be explained below.

In the case of the A0 reflection mode, if the support selected in this case is not metallic, for example glass or ceramic, a thin metal layer, for example nickel, chromium, etc., is applied by vapor deposition in vacuum.

This support is then coated with a 5-6 .mu.m thick layer of a first lacquer sensitive to gravity radiation. This lacquer is, for example, a positive Sibley (5hipley) AZ11115.
0 (trade name)・This lacquer is applied by centrifugal force. The surface of this first lacquer layer is covered with a thin layer of approximately 0.5 μm of a second lacquer sensitive to visible light. This lacquer is an orthochromatic Kodak lacquer.

-Using an optical system compatible with cathode ray tubes and applying light shielding,
An image with the desired cavity shape is projected onto the second lacquer layer.

- Developing this single layer of insulating lacquer and reproducing the cavity shape results in a mask of exact shape, which corresponds to the convex surface of the support.

- The support is then placed in a second shading device and an out-of-line radiation is formed, for example from a short arc seat.

This support causes the outside radiation due to this short arc to be generated from point A, which will later become the deflection center of the electron beam of the cathode ray tube. In the above tube, point A is 1 point from the screen.
Located at 80 fins. This results in areas in which the lacquer is polymerized, the axes of which converge towards point A.

- The polymerized area is treated with UV developer,
For example, it can be developed and removed using Shibraidi Berotsuba or "Mike Bojit Dei Perotsupa" (trade name). This results in a negative structure having the desired cavity shape.

Either the metal layer initially deposited in the hollow part of the first lacquer layer with a thickness of about 5 μm is used as an electrode, or the metal support itself is used as an electrode, and Qu, Au,
Ag or Ni metal is electrolytically grown. The metal is deposited until the thickness of one layer of lacquer is reached. Lacquer walls have a very regular shape. This is because growth is guided by the wall.

■ Remove the remaining non-polymerized lacquer using acetone or alcohol, which forms a cavity in the form of a cavity with a metal base and edges.

- The support with such a cavity shape is placed in a device for centrifugally depositing liquid powder, and a luminescent substance is deposited in the cavity shape. This luminescent material is typically a particulate material, and the particle diameter is centered around 8 μm, and is 1 to 6 μm in diameter.
Let us show the distribution of μm. At the end of this final step, the screen formed by this method is ready to be mounted directly into a cathode ray tube.

B. For screens used in transparent mode In this case -
The support must be transparent, such as glass or crystal. In this case, as a first step, instead of the previous example, an electrically conductive and mechanically transparent oxide is deposited. The vapor deposition in this case is Sno.

Alternatively, the thickness of Ni, 08 is about 800 mm, and the resistance is about 400 Ω, which is determined depending on the application. This step replaces the first step.

The other steps that follow are similar to those described for reflection mode operation.

In this alternative method, a thin pellet of nitrocellulose is deposited in a liquid medium on the side where the luminescent material is present, and on top of this a thin pellet of nitrocellulose, for example aluminum, 1000 nm thick is deposited in a vacuum. A heat treatment to 850° C. is carried out in air to form a thin pellet of nitrocellulose (li'), so that the metal layer remains only in the cavity shape filled with the luminescent material. This thin metal layer allows the electrons of the electron beam to pass through, but when the luminescent material emits light, it operates to reflect the light.

Description of a Specific Example of a Cathode Ray Tube FIG. 4 shows a cathode ray tube in which a convex screen is disposed within the cathode ray tube and is used in conjunction with an optical projection system.

In such a cathode ray tube, the neck part 18 of the tube has a length of 250 mm and a diameter of 86 fins, the cone part of the tube has a length of 150 mm, and the outer casing has a diameter of 150 ml at its widest point.
1. As its name suggests, the cone section generally has a conical shape over its entire length, but instead, the cone section may be shortened in length and followed by a cylindrical section.

An electron gun using an indirectly heated hot cathode is provided, and a certain number of anodes 110 for accelerating electrons are provided therein, and the anodes for accelerating the electron beam are deposited on the neck of the tube 13. This focal point is formed electrostatically or magnetically using an external coil. The cathode ray tube has a deflection coil 120X,
Performs scanning in the Y-axis direction.

A screen support 61 is placed on the cone portion of the negative ti and w tubes, and the screen 41 is attached to this. Coolant introducing means 52 to the reflecting mirror 49 and screen made of metallic glass
and a discharge means 58 are provided in the cathode ray tube.

A beehive plate 5 is used as a beam receiving device on the outside of the tube.
Set 0. This board is called a Schmidt board and is generally made of plastic material. The dimensions of the rectangular screen 41 are 8f3trm x 4f3b. The radius of curvature of the convex screen is half the radius of curvature of the reflecting mirror 49.

This reflecting mirror 49 has a hole with a diameter of about 35 mm in its center so that the electron beam can reach the screen.

Assuming that the beam current of the cathode ray tube is approximately 2 mA and the high voltage peak reaches approximately 50 kV, the power consumed in the screen is 100 W. , this is 1.517 minutes of serving time and the temperature of the screen is 100
Do not allow the temperature to exceed °C.

[Brief explanation of drawings]

1 is a diagram showing the change in luminance of the luminescent layer as a function of humidity; FIG. 2 is a partial cross-section of a known cathode ray tube with a flat screen; FIG. FIG. 4 is a partial sectional view of a second embodiment of a cathode ray tube according to the invention having a convex screen and an optical projection system; FIGS. FIG. 2 is an explanatory diagram showing a screen as a cross section to show a manufacturing process of a screen for a cathode ray tube according to the present invention. 40...Support 41...Screen (first lacquer layer) 1, 48.4
4... Cell A point... Deflection center point 62... Second lacquer layer. Fluiran Pen Fapriken FIG, 1 3 FIG, 2 FIG, 3 FIG, 4 FIG, 5 1 Fl (36

Claims (1)

Claims: 1. A luminescent screen comprising a support with luminescent material, the support with luminescent material having cells filled with luminescent material, and the cells having a plurality of adjacent cells extending into the support. The cathode ray tube is formed as a tube with a supporting body having reflective properties, characterized in that the axes of the cells converge to substantially point at the center of deflection of the cathode M tube. Cathode at for projection television. λ The support has two glass plates transparent to light, these plates are parallel to each other and form a double wall on the outer casing of the tube, and the cells of the screen are provided on the inner wall of the support inside the tube. These cells are coated with a metal coating that allows the electrons of the electron beam to pass through but reflects the light, and the double wall has an inlet and an outlet for passing the coolant between the two glass plates. A cathode ray tube according to claim 1, characterized in that the cathode ray tube comprises: & The cells of the screen emit light only on the side of the electron beam incident on the screen, and the cathode ray tube has an optical device for projecting an image, and the support is provided with a device for cooling the screen. A cathode ray tube according to claim 2, characterized by the cathode ray tube according to claim 1, comprising a screen and a support. (v) The cathode ray tube according to claim 2, characterized by a screen and a support. & A cathode ray tube according to claim 8, characterized by a screen and a support. 9. The cathode ray tube according to claim 8, comprising: a screen and a support. a. An optical device that projects the image from the screen is located at the back of the tube, and its axis is aligned with the tube axis.
8. A negative i-ray tube according to claim 6, which comprises a concave mirror directed toward the screen and a correction plate located behind the screen to correct chromatic aberration of the concave mirror. 9. The cathode ray tube according to claim 8, wherein the concave mirror is provided inside an outer casing of the cathode ray tube. 10. The cathode ray tube according to any one of claims 1 to 9, wherein the cathode ray tube is used as a projection television projection tube. IL A luminescent screen that has a pattern of tubular cells filled with a luminescent material, and that has a cell pattern whose axes converge approximately to the same point on the axis of the screen. A method for manufacturing a luminescent screen for a cathode ray tube coated with a cathode ray tube, comprising the following steps: an electrically conductive screen, or one side of the screen coated with an electrically conductive layer, sensitive to electrophoretic radiation; sexual first
applying a layer of lacquer and matching the thickness of this first layer to the desired dimensions of the cells of the screen; drying said first layer of lacquer to form a solid; - on said first layer of lacquer; applying a second layer sensitive to white light or monochromatic light on the second layer; - depositing a multi-turn image formed in the form of a mask of large dimensions on the second layer with white light or monochromatic light at a magnification; Projection q′j by an optical projection system of 1 or less
(b) forming this pattern by the magnification of an optical system, the pattern having figures corresponding to the holes of the cells on the screen surface; - developing the second layer exposed in this way; - through the mask formed as described above by means of a uniform violet radiation source located on the axis of the support and on the opposite side of the mask from said first lacquer layer at the center of deflection of the electron beam. - Developing, drying and heating the thus exposed first lacquer layer; (1) applying metal walls to the perforated parts of the lacquer of the first lacquer layer; or a luminescent screen comprising the steps of: - growing walls of electrically insulating material; - dissolving the remaining resin; - filling the formed cells with luminescent material. A method for manufacturing a cathode ray tube. a metal wall is formed by electrolytic growth in the lacquer cavity of the first lacquer layer, parallel to the electrically conductive surface of the support and to the opposite play surface of the first lacquer layer; 12. The method according to claim 11, characterized in that an electric field is applied between the electrode and the metal to transport the metal. 11L growing walls of insulating material in the cavities of the lacquer of the first lacquer layer by electrophoresis or anaphoresis, in which case the transport ζ of the particles of the insulating material is caused by the support of the screen and the first lacquer; 12. A negative 8II wire tube according to claim 11, wherein the growth is performed by electrostatic force due to an electric field applied between an electrode provided parallel to the free surface of the layer, and the tube is sintered at a high temperature after being grown in this manner. 14 The electrically insulating material is Sin, , A/, 0
8. MgO. The cathode ray tube according to claim 18, wherein the cathode ray tube is Be1O. 1 & The screen support is made of glass, this glass is photosensitive to electrophoretic radiation, and the cells of the screen are directly formed by placing a substantially uniform violet radiation source on the axis of the support and exposing the photosensitive glass. 12. The cathode ray tube according to claim 11, wherein the exposure is performed through a mask previously deposited on the support.