JPH0413384A - Manufacture of large sized screen display device employing cathode ray tube and its component - Google Patents

Abstract

PURPOSE:To eliminate joints between cathode ray tubes and to improve the picture quality by providing sets of transparent rods densely in close to a front face of an image receiving face, employing the cathode ray tube whose size is smaller than a large sized screen, making the cathode ray tube with a front face glass with a specific thickness and selecting the length of the transparent rods getting longer from the middle toward the circumference gradually. CONSTITUTION:Sets 3 of transparent rods 30 are provided densely in close contact with a curved face of a front face glass 5 of a cathode ray tube and tips 4, 40 of the transparent rods of adjacent cathode ray tubes are arranged in a direction close to each other. The thickness of the front glass 5 of the cathode ray tube is formed thin, the length of the transparent rods 30 is selected shortest in the middle of the front glass 5, gets longer toward the circumference so that a radiating face X, X is formed to be a curved face close to a flat face. The thickness of the glass 5 is selected to be, e.g. 4mm, the apparent thickness of the glass is selected to be 2mm, the width W of scanning line is selected to be 4mm, number of scanning lines is selected to be 100 and a large sized screen whose height is nearly 2.2m is formed by employing 5 cathode ray tubes in the vertical direction. Moreover, no black frame is caused to joints of the cathode ray tubes even when one picture is formed by arranging lots of cathode ray tubes in parallel.

Description

[Detailed description of the invention] [Industrial application field]

A method and means for erasing a black frame that occurs at the joint between adjacent cathode ray tubes when a large number of cathode ray tubes are arranged in parallel to form one color display.

[Conventional technology]

The seam between one cathode ray tube and the adjacent cathode ray tube appears black and is unsightly.

[Issue to be solved]

By eliminating black (dark) seams, it is possible to create large color displays with many cathode ray tubes arranged in parallel.

[Means to solve]

A0 Invention 1 Invention 1 is configured as follows, as shown in FIG. 1, for example. In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 are provided in front of each image receiving surface 2 in a dense manner on the image receiving surface 2, and so on. The leading edge 4 of the transparent bar 30 is arranged in a direction in which the leading edge 4 of the transparent bar 30 is substantially in contact with the leading edge 40 of the transparent bar of the other image receiving surface 20 at the boundary where the transparent bar 30 contacts the image receiving surface 20 of the image receiving surface 20 . The glass 5 on the front side of the cathode ray tube has a thickness T that is approximately no larger than the scanning radiation W, and is formed of a thin glass that is bulged forward extra as a means to reduce the thickness T. The length of the transparent rod 30 is It is a large screen display device using cathode ray tubes that are short in the center of the glass and gradually become longer toward the periphery. B0 Invention 2 The present invention 2, as shown in FIG. 2, is characterized by the following configuration. In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 3o are provided in front of each image receiving surface 2 in a dense manner on the image receiving surface 2, and so on. The leading edge 4 of the transparent bar 30 is arranged in a direction in which it almost touches the leading edge 40 of the transparent bar of the other image receiving surface 20 at the boundary where it touches the image receiving surface 20, and the cathode ray tube is smaller than the large screen. The size of the transparent bar 30 is such that the thickness T of the front glass is approximately not larger than the scanning line width W, and the length of the transparent rod 30 is short at the center of the glass and short at the periphery. This is a large-screen display device using cathode ray tubes, which are gradually extended from side to side. C0 Invention 3 Invention 3 is in Invention 1 or Invention 2, as shown in FIG. The bundle B has a quadrilateral cross section compressed until the air content of the entrance surface 200 is close to zero, and is formed to gradually widen toward the exit side. D9 Invention 4 Invention 4 is characterized in that, as shown in FIGS. 13 to 16, the invention 4 is configured as follows in the above invention 3. In the above manufacturing method of bundle B, a temporary frame F made of synthetic resin in the shape of a quadrilateral cylinder is provided to house small groups of transparent rods, the small groups of transparent rods are packed together, and the multiple pieces surrounding the temporary frame F are pressed. A method for producing a bundle of small groups of transparent rods, in which the temperature is raised while pressing the material 50 more on the entrance side and less on the exit side, and the transparent rods are compressed and deformed until the air on the entrance surface 200 is expelled to form a small group of transparent rods in a shape that spreads toward the end. It is. E0 Invention 5 Invention 5 is a method for manufacturing bundle B of Invention 3. As shown in FIGS. 19 and 20, the configuration is as follows. The frame f is plastically deformed using a shape memory polymer that is formed by increasing temperature so that the entrance surface 200 is deformed to a size that expels the air from the small group of transparent rods, and the exit side becomes a quadrilateral cylinder shape that widens toward the end. By this, a frame f of a quadrilateral cylinder with each wall surface being a quadrilateral (including a parallelogram) is formed, a small group of transparent rods is housed in the frame f, the temperature is raised, and the small group of transparent rods is deformed into a shape that expands toward the end. It is something that makes you F0 Invention 6 Invention 6 is the manufacturing method of bundle B of Invention 3, and as shown in Fig. 19 and Fig. 20, the frame f is deformed to a dimension in which the entrance surface 200 expels the air from the small group of transparent rods, and the exit side widens toward the end. Using a shape memory alloy whose shape is formed by increasing temperature so that it becomes a quadrilateral cylinder, a frame f of a quadrilateral cylinder with each wall surface having four close shadows (including a parallelogram) is formed. A small group of transparent rods is accommodated in a chamber f, the temperature is raised, and the small group of transparent rods is deformed into a shape that spreads toward the end. G0 Invention 7 Invention 7 is a method for manufacturing bundle B of Invention 3, and as shown in FIG. 19, it is constructed as follows. A small group of transparent rods is press-fitted and housed in a frame f made of an elastic material, the entrance surface 200 of which is designed to expel air from the small group of transparent rods, and the exit side of which is designed in the shape of a quadrilateral cylinder that widens toward the end.
The temperature is raised to transform the transparent rod group into a shape that expands toward the end. H0 Invention 8 Invention 8 is a method for manufacturing the handle B of Invention 3, and although not shown, it is constructed as follows. The shape of the frame f-F described in the above-mentioned inventions 3 to 3 is
It is formed into a polygonal part instead of a quadrilateral cylinder.

[Effect]

A1 Invention 1 In FIG. 1, the pixels shining on the image receiving surface 2 of the cathode ray tube 1 pass through the transparent bar group 3 and are emitted from the leading edge 4. Light rays are emitted from the leading edge of each transparent rod in a dot shape according to the screen of the image receiving surface 2. The group 3 of transparent bars is oriented to cover the frame 7, resulting in a continuous exit screen without a black frame. However, the front surface of the cathode ray tube is covered with a thick glass 5 as shown in FIG. 11, and the tip 31 of the transparent rod cannot approach the pixels 6, so there is an extra pixel 6a. 6N) also enters the transparent rod tip 31, so accurate resolution cannot be obtained. Therefore, as shown in FIG.
It is desirable to provide a small value. However, recently, as shown in FIG. 21, cathode ray tubes for color TVs have been designed with a thick front glass 50, as is well known, and efforts have been made to make the surface shape as flat as possible, approaching the shape of a flat plate. Contrary to the improvement in the technical level of color TV cathode ray tubes, the present invention ignores the odd shape and bulges the front glass. The inventors focused on the fact that even thin glass, such as that found in thermos flasks and fluorescent lamps, can withstand atmospheric pressure. It is applied to cathode ray tubes. FIG. 1 shows an example of this, and it is designed to bulge out more forward than the general product shown in FIG. 21, so that the bulge is, for example, three times that of the general product. As a result, the image in front of the glass is curved, resulting in an image that is extremely strange compared to current common sense. However, in the present invention, since it is shown to the audience through the transparent rod group 3, the length of the transparent rod 30 is adjusted so that it is short at the center of the glass 5 and gradually lengthens toward the periphery along the curved surface of the glass. Lengthen. As a result, the exit surfaces X...X can be made substantially flat or gently curved. However, even if the above-mentioned means are executed, a clear image cannot be obtained. The means for obtaining a clear image will be described in detail in Example 1 below. B0 Invention 2 In Invention 1, the front glass of the cathode ray tube is significantly bulged as a means of making the glass thinner, making it easier to withstand atmospheric pressure, but in place of this means, Invention 2 makes the glass thinner. As a means, a glass member of the same type as a common color TV cathode ray tube is used. As the overall dimensions of the cathode ray tube are gradually reduced, the glass becomes thinner, and the thickness T of the front glass becomes approximately the same as the scanning line width W, as shown in FIG. Although not shown, it is more preferable that T<W. Cathode ray tubes of such dimensions are stacked one above the other in multiple stages. (Second
Figure) As a result, a single cathode ray tube receiver has fewer scanning lines. In this case, a conventional shadow mask or the like may be used, a roughened shadow mask may be provided, or the shadow mask may be omitted. The same symbols 2.2o, 3.3o, 4.40. as in Example 1.
5 is the same as in Example 1, and its explanation will be omitted. C9 Invention 3 The transparent rod group 3 described in Invention 1 is a group of transparent rods 30, and each transparent rod is required to be optically separate. Therefore, the respective transparent rods cannot be melted or bonded with adhesive. Therefore, it is necessary to bind the separate transparent rods into a bundle, even if it is troublesome. However, the entrance surface has a large concave surface, and is unstable and prone to collapse when bundled. Invention 3 solves the problem by stacking bundles of small groups of transparent rods. The transparent bar population is B a , B b , B c , B
It is divided into small groups like d ・−=−=,
This small group of transparent rods is tied together with a band 8 to form one handle (bundle) B as shown in Figure 3. This bundle B is stacked in multiple stages to form an exit surface X...-X as shown in FIG. The stacking means will be described in Example 3. D0 Invention 4 to F0 Invention 8 Invention 4 to Invention 8 are methods for manufacturing bundle B, and will be explained in detail in Examples 4 to 8.

[Embodiment 1] Invention 1 Refer to Figs. 1 and 3 to 11 In Fig. 1, a group 3 of transparent rods 30 is densely provided close to the curved surface of the front glass 5 of the cathode ray tube, and adjacent to each other. The ends 4.40 of the transparent rods of the cathode ray tube are oriented toward each other. Contrary to current common sense, the front glass 5 of the cathode ray tube, which has bulged significantly, is formed to be thin, and the transparent rod 30 is formed on the front glass 5.
It is short at the center and long at the periphery, and the injection surface
X is a curved surface that is close to a flat surface. To give an example regarding the thickness of glass, if the thickness of the glass is 3 + sm, the apparent thickness is the upper thickness (light rays passing through the glass are refracted in a direction approaching a line perpendicular to the glass surface). , which appears thinner than it actually is) is, for example, 1.5 mm depending on the viewing angle, and when used with a scanning line width of about 3 mm, the resolution approaches the practical level. Figure 4 shows an example of this, assuming that the thickness of the glass is 4 mm, the apparent thickness of the upper glass is 21I11, and the width of the scanning line W.
By using a 4mm screen, 100 scanning lines (40cm high), and 5 cathode ray tubes (top and bottom), a large screen approximately 2.2m in height can be formed. In this case, the diameter d of the transparent rod 30 is thinner than the width W of the scanning line, and is made one-fourth as thin as the width W of the scanning line in the figure. Making the transparent rod thinner does not involve any technical burden and has some effect on improving resolution. If technology permits, if it is possible to design a glass with thinner glass, or if the glass can be expanded to a larger extent to make it thinner, the resolution can be improved accordingly. In that case, the number of cathode ray tubes may be decreased by increasing the number of scanning lines of the cathode ray tubes by -. Compared to the case of optical fiber communication, the distance of the present invention is very close, and the material of the transparent rod may be flexible in terms of transparency, and synthetic resin is sufficient. Examples of such close-range light transmission include five applications (including Utility Application No. 63-113925 filed earlier by the applicant of the present invention).
(hereinafter referred to as the prior application), we created a number of prototypes and confirmed their effectiveness. Although both prototypes are made of synthetic resin,
Fortunately, we were able to obtain a clear transmission beam due to the close distance. However, in the present invention, a prototype was produced according to the above-mentioned FIG. 1, but unfortunately, the image was blurred like a halation, lacked contrast, and became a dull black image. So, we conducted another experiment with the aforementioned prototype, and as expected, we were able to achieve clear light transmission. The inventors researched why the prototype model based on Figure 1 causes halation-like blur, thinking that if they could find out the cause, they would be able to obtain the same sharpness as the previous application. The resulting theory is described next. In FIG. 5, the transparent rod group 3 is a collection of individual transparent rods 30, and air E is filled between each transparent rod. If this state is considered as a side view, it will be as shown in FIG. Oblique light 1i La entering from the cutting surface 31
, travels through the transparent rod while being totally reflected. This is the basic principle of optical fiber. However, the oblique light beam Lb incident from the air E travels in an oblique direction as shown in the figure.The two travel along completely different optical paths. This phenomenon is harmless in the case of long-distance communication, and is not harmful to light! Lb diverges to the side and does not become an obstacle, but in the present invention, the rays emitted at close range, the rays b, and b become a halo-like diffused light (2), blurring the outline of the screen and making black areas muddy. Since the cause was clarified as described above, the above-mentioned problem was resolved by the means shown in the following figures. (Fig. 7) A group of transparent rods 30 is uniformly heated to near the softening point, and pressure perpendicular to the axis is applied to deform the cross section as shown in Fig. 7. As a result, the presence of air in the entrance section becomes minimal. (Fig. 8) When the group 3 of transparent rods 30 is made into a so-called "composite yarn" state in which transparent rods 30 and dark-colored filaments 9 are mixed,
The light rays traveling through the air often collide with the dark filament 9,
Light rays in the air are absorbed. (FIGS. 9 and 10) Dark-colored paint 32 is applied to the cut surface 31, and later polished to expose the cut surface 31 and finished as shown in FIG. 10. Dark film adhesive may be used instead of paint. In addition to the above, although not shown, the surface of the transparent rod 30 may be coated with a coating material as an optically separate body.

[Embodiment 2] FIG. 2 Similarly to Embodiment 1, a group 3 of transparent rods 30 is densely provided close to the curved surface of the front glass 5 of the cathode ray tube, and the tips of the transparent rods of adjacent cathode ray tubes are 4.40 are arranged in a direction approaching each other. The difference from Embodiment 1 is that the cathode ray tube is made smaller as a means of making the glass thinner, resulting in a large number of cathode ray tubes being stacked one above the other. For example, the scanning line width W is 4 mm, and the height of the large screen is approximately 2.2 mm.
m, if cathode ray tubes are stacked 10 times above and below, cathode ray tubes -
Each receiver is required to have 50 scanning lines and a glass thickness T of approximately 4 mm. If possible, it is desirable to use TOW to improve resolution. If there is a limit to the thickness T of the glass and it cannot be made thinner, stack more pieces, for example 15 pieces to make a screen with a height of 3.3 m, and the scanning line will be 6 mm, even if the glass is 6 mm thick. approaching the practical level. As mentioned above, it is desirable that T < W. The halation-like blur prevention means and transparent rod binding means described in the first embodiment are also common to the second invention. Also invention 1
Similarly, it is better to make the diameter d of the transparent rod thinner than the scanning line 1@W.

Embodiment 3 As shown in FIG. 3, a small group of transparent rods 30 made of synthetic resin are tightened by a band 8 as a bundle B, and the injection side is held widened toward the end. The shape of the band 8 is a rectangular cylinder in which each month is formed by four pieces of a trapezoid or an inclined trapezoid. The entrance surface 200 is tightened and deformed into a quadrilateral shape with almost no air present, and is formed into a concave surface that matches the convex surface of the front surface of the cathode ray tube. A transparent thin film may be attached to the incident surface 200 or a transparent agent may be applied thereto. Stack the desired number of bundles B, and stack the 12th bundle if necessary.
As shown in the figure (the cross-section is drawn with exaggerated thickness), bands 80 and 81 connecting each bundle are also added to join each bundle, and the injection side is aligned with the line X...X (Figure 1). Trim along. A transparent layer may be attached to the cut surface using a transparent adhesive.

Embodiment 4 An example of the manufacturing method of bundle B shown in FIGS. 13 to 18 will be explained. Synthetic resin transparent rod 3
Quadrilateral cylindrical temporary frame F made of synthetic resin that accommodates a small group of 0
A small group of transparent rods is stored in a dense manner. In this embodiment, as the above temporary frame F, as shown in FIG.
A rectangular cylinder is manufactured using a shape memory polymer that memorizes a shape in which the pieces are trapezoidal (it may be an inclined trapezoid as shown in Fig. 18; the same applies hereinafter), and this is plastically deformed at room temperature to form the 14th cylinder.
As shown in the figure, a quadrilateral cylinder with a quadrilateral wall was fabricated and used as a temporary frame F. The transparent rods 30 are densely packed into this temporary frame F, and as shown in FIG. 15, four pieces of pressing material 50 are provided surrounding the temporary frame F.
The pressing member 50 was tightened with a rubber band (not shown) surrounding the outer periphery. As shown in Fig. 16, each month of the pressing member is connected to each other by a comb-shaped portion 51, but in the end, it becomes an inclined line.
・・・・・・Design so that the temporary frame F is narrowed to the limit of L. Therefore, the entrance side is narrowed down more and the exit side is narrowed down less. As described above, it was placed in a heating chamber with the rubber band tightened and heated using high-frequency waves. After heating and deforming until the air on the entrance surface 200 was expelled, the temperature was lowered and taken out, a transparent thin film was pasted on the entrance surface, and a film was pasted on the exit side as well, and the deformation was completed. Finally, the bundle was tied with band 8. The band 8 may be replaced by the temporary frame F itself, which has a quadrilateral cylinder shape with trapezoidal sides as shown in FIG. 3, and grips the small group of transparent rods in a manner that spreads toward the end. The above method can compress the incident surface by about 5% in one side direction. However, for the purpose of shortening the length of the transparent rod and reducing the amount of transparent rod used, the 17th
As shown in the figure, the cross section of the transparent rod may be made into an "unusual cross section" to increase the amount of compression. For example, if it can be compressed by 10% in the - side direction, it can be made that much steeper and wider at the end. In that case, it can be made into a short transparent rod, which helps reduce weight. The figure is only one example of the shape of the cross-section, and as is well known in the textile industry, many different cross-sections are possible. The longitudinal direction is a straight S shape. In the above embodiments, a shape memory polymer was used as the temporary frame F, but a similar effect can be obtained by using a polymer that shrinks by heat in the direction of the - side. You can settle for synthetic resin.

[Example 5] If the temporary frame shown in Fig. 19 is calculated mechanically with great care and the transparent rod is softened and deformed as calculated, the shape memory synthetic resin will have the ability to deform at elevated temperatures. The small group of transparent rods can be compressed and deformed simply by using this method, and the above-described embossing material 50 does not need to be used. What is particularly important to keep in mind is the phenomenon in which the wall surface ``curves outward'' under the pressure exerted by the transparent bar, and this point has been carefully calculated and a curvature called ``camber'' is provided in advance. Camber is the process of forming an arch in advance in anticipation of bending due to the load it receives.
In the plastically deformed shape), the camber is indicated by C. In addition to camber, each wall also stretches due to pressure from the transparent rod.
Calculate in advance the phenomena that occur.

[Example 6] This Example 6 replaces the shape memory polymer in Example 5 with a shape memory alloy, and the rest is similar to the structure, operation, and drawings explained in Example 5, so they will be incorporated and the explanation will be omitted. do.

[Example 7] Fig. 19 Example 5. In place of the shape memory resin and shape memory alloy in Example 6, the entrance surface 200 was designed to have dimensions that expel the air from the small group of transparent rods as shown in FIG. Bundle B can also be formed by mechanically pressing and raising the temperature. Even if it is force-fitted, it must be within the range of elastic deformation, and the material must be selected carefully.If it is an elastomer, there will be no problem with elasticity, but if it is a metal, it must be porous to obtain sufficient elongation.
It may also be provided to obtain sufficient elasticity, such as by making it porous. H0 Invention 8 Although the shape of the frame f-F described in Inventions 3 to 3 is a quadrilateral cylinder, it may be a polygonal part instead of the quadrilateral cylinder. For example, similar effects can be obtained with triangular cylinders and hexagonal cylinders, and two right triangles form a quadrilateral. In the case of a hexagonal cylinder or an equilateral triangular cylinder, a bundle of a different shape is required to fill the part in contact with the frame 7. Further, in the inventions 3 to 3, the above-mentioned frames F and f may be used in place of the band 8 (FIG. 3). This concludes the explanation of each embodiment corresponding to each claim. Although the cathode ray tube is used as the image receiving device in claims 1 to 3 and each of the embodiments, a large screen with inconspicuous seams can be obtained even if a liquid crystal image receiving device is used instead of the cathode ray tube. If the image receiving surface is flat, such as a liquid crystal, or if the image receiving surface is a gently convex surface, as in Embodiment 2, it is surrounded by a wall surface that is tilted in one direction and spread out (referred to as an inclined trapezoid), as shown in Fig. 18. Turn the handle to B. Although the temporary frame F was used in the fourth embodiment described above, a method of manufacturing the bundle without using the temporary frame F at all is also conceivable. Instead, the structure of the embossed material 50 becomes complicated, but for example, the wall surface of the embossed material gradually becomes trapezoidal (or inclined trapezoid) as the transparent rod is heated and softened. The bundle B may be manufactured without using the temporary frame F by using a stamped material having a wall surface with a structure that can be deformed in a manner similar to the shape change of the shape memory resin. In general, cathode ray tubes for color TVs are gradually evolving into flat screens as technology advances. The expression "extra forward bulge" mentioned in claim 1 means an extra bulge compared to the evolving state of the art. Therefore, as the technological level improves, color TV screens will become flat, and the "extra bulge" for the purpose of making the glass thinner will also decrease in proportion to the flattening of color TVs. You can do less. However, the objectives of "flattening the screen" and "thinning the glass" are different, and it cannot be avoided that the amount of bulge will always differ between the two. Throughout the text, the shape of bundle B has been described as having a quadrilateral cross section, but to state it accurately, some modifications are required. The front surface of the cathode ray tube is spherical, and strictly speaking
Like longitude and latitude, node B also needs to be a quadrilateral with some distortion.It is omitted from the entire text. [Effect] ■ A single unit made up of many cathode ray tubes arranged in parallel. Even in images, black frames do not occur in adjacent areas of the cathode ray tube. ■ According to invention 1, the glass of the cathode ray tube can be made thinner, and images with good resolution can be obtained. ■ According to invention 3, the transparent rod group is a small group. It is easy to manufacture and the structure can be made thin. ■ According to invention 4 to invention, a bundle with a wide end in which the transparent rods are spread evenly can be obtained, and if transparent rods with an irregular cross section are used, a steep angle can be obtained. Assuming that it is possible to manufacture ultra-large cathode ray tubes, the advantage of having a shallower depth than the project type is that the transparent rod can be made shorter and lighter. There is.

[Brief explanation of drawings]

1 to 4 are configuration diagrams showing essential parts of an embodiment of the present invention, and FIGS. 5 to 11 are explanatory diagrams explaining details of the present invention,
FIG. 12 to FIG. 20 are explanatory diagrams of the method for manufacturing transparent rod groups;
FIG. 21 is a sectional view of a conventional example.

Claims (1)

[Scope of Claims] [1] In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 is arranged in front of each image receiving surface 2 to receive an image. The transparent rods 30 are arranged in a dense manner on the surface 2, and the leading ends 4 of the transparent rods 30 are arranged in a direction in which the leading ends 4 of the transparent bars 30 are substantially in contact with the leading ends 40 of the transparent rods of the other image receiving surfaces 20 at the boundary where they touch the other image receiving surface 20, and the cathode ray tube The front glass 5 is formed of a thin glass whose thickness T is approximately not larger than the scanning line width W, and which bulges out extra forward as a means to reduce the thickness T, and the length of the transparent rod 30 is the same as that of the glass. A large screen display device using a cathode ray tube, which is short in the center and gradually becomes longer towards the periphery. [2] In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 are densely arranged on the image receiving surface 2 in front of each image receiving surface 2. The leading edge 4 of the transparent bar 30 is arranged in a direction in which the leading edge 4 of the transparent bar 30 is substantially in contact with the leading edge 40 of the transparent bar of the other image receiving surface 20 at the boundary where it touches the other image receiving surface 20, and the cathode ray tube is arranged on the large screen. It is small in comparison, and its size is such that it is constructed of a front glass whose thickness T is approximately not larger than the scanning line width W, and the length of the transparent rod 30 is short at the center of the glass. , a large screen display device using cathode ray tubes that gradually extend toward the periphery. [3] The transparent rod 30 is made of thermo-softening synthetic resin, and the transparent rod group 3 is composed of a large number of small bundles B of transparent rods, and the bundle B has an air content near zero on the incident surface 200. Claim 1 or Claim 2, wherein the cross section is compressed until it becomes a quadrilateral, and is formed to gradually widen toward the injection side.
A large screen display device using a cathode ray tube as described in . [4] In the above manufacturing method of bundle B, a temporary frame F made of synthetic resin in the shape of a quadrilateral cylinder is provided to house small groups of transparent rods, and the small groups of transparent rods are densely housed. According to claim 3, the temperature is increased while pressing more on the entrance side and less on the exit side using a piece of pressing material 50, and compressive deformation is performed until the air on the entrance surface 200 is expelled, thereby forming a small group of transparent rods in a shape that spreads toward the end. A method for manufacturing transparent rod small group bundles. [5] The frame f is made using a shape memory polymer that is formed by heating the shape so that the entrance surface 200 is deformed to a size that expels the air from the small group of transparent rods, and the exit side becomes a rectangular cylinder shape that widens toward the end. Through plastic deformation processing, a frame f of a quadrilateral cylinder with each wall surface being a quadrilateral (including a parallelogram) is formed, a small group of transparent rods is housed in the frame f, and the temperature is raised to form a small group of transparent rods. The method for manufacturing the bundle B according to claim 3, wherein the bundle B is deformed so as to spread toward the end. [6] The frame f is made using a shape memory alloy whose shape is formed by heating so that the entrance surface 200 is deformed to a size that expels the air from the small group of transparent rods, and the exit side becomes a quadrilateral cylinder shape that widens toward the end. , each wall surface forms a frame f of a quadrilateral cylinder (including a parallelogram), a small group of transparent rods is housed in the frame f, and the temperature is increased, and the small group of transparent rods is deformed into a shape that expands toward the end. , A method for manufacturing bundle B according to claim 3. [7] A small group of transparent rods is press-fitted and housed in a frame f made of an elastic material whose entrance surface 200 is designed to expel air from the small group of transparent rods, and whose exit side is designed in the shape of a quadrilateral cylinder that widens toward the end. 4. The method for manufacturing bundle B according to claim 3, wherein the temperature is increased to deform the transparent rod group into a shape that spreads out. [8] The shape of the above-mentioned frame f/F/band 8 is a polygonal cylinder,
The method for manufacturing bundle B according to claims 3 to 7.