JPS598258A - Cathode-ray tube for light source - Google Patents

Abstract

PURPOSE:To reduce the visual distance of a cathode-ray tube greatly by specifying the distance between a structure and a fluorescent film by the inner diameter of the structure, the largest diameter of the fluorescent film, the distance between adjacent fluorescent films and the spreading angle of a non-focused electron beam. CONSTITUTION:When the inner diameter of a structure 12 is supposed to be d, the distance between the structure 12 and a fluorescent film 14 is supposed to be l, the largest diameter of the fluorescent film 14 is supposed to be D1, the distance between adjacent fluorescent films is supposed to be D2 and the spreading angle of a non-focused electron beam is supposed to be theta, these values are specified as being indicated in the formula. In a light source cathode-ray tube with such constitution, when a non-focused electron beam 10 is discharged from an electron gun 4 at a given spreading angle, the peripheral part of the beam 10 is trimmed according to the inner diameter of the cylindrical structure 12, thereby there is nothing to stimulate part of a fluorescent film 14 formed on the inner surface of a vacuum encircling case 1 which is adjacent to and other than a given part of the film 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a cathode ray tube that constitutes the backbone of a giant color display device used outdoors.

Conventionally, for example, electric display boards at baseball stadiums, rooftops of buildings, υ used to display advertising images and messages on walls, huge display devices used for information displays such as expressway maps, etc. created images by arranging a large number of light bulbs and blinking them selectively, which caused many problems.

To give some examples, for example, in the case of a light bulb, the light is obtained from the red heat of the filament, so
Mainly, the luminescence is orange or white-orange. For this reason, it has been quite difficult to generate a large amount of light, such as night or green color light, from these light bulbs. In addition, in the case of such a light bulb method, in order to modulate the brightness of each pixel, it is necessary to turn the applied current of the equipment on and off, or to vary the applied current, but these light bulbs The frequency is very low, less than 10 Hz, and there is a problem that the color of the emitted light itself changes depending on the applied current, making it difficult to use it for halftone display or cuff display that synthesizes light of any color. Furthermore, in such a huge dice play device, generally 2
There are many cases in which dozens to tens of thousands of light bulbs of about 0 to 40 W are lined up, and there are many problems in terms of power consumption and heat generation.

Therefore, the inventor of the present invention has already proposed the use of a cathode ray tube as a light source for the above-mentioned display device.

Figure 1 shows an example of the structure of a cathode ray tube for use as a light source, which is used as a gigantic daylight source, which the inventor has developed as a prior invention. For example, it is a cylindrical vacuum envelope. This vacuum envelope (1) has at one end a face gaff 7, (3) having a fluorescent surface (2) adhered to its inner surface, and at the other end, the entire surface of the fluorescent surface (2) is covered with non-focused electrons. An electron gun part (4) for irradiating with the beam ON and a 7-tem part (5) that has terminals for applying a required voltage to each part of the electron gun part (4) and closes the vacuum envelope (1). has. (6). (7) and (8) are a heater, a cathode, and a grid, respectively, constituting the electron gun section (4).

To explain the operation of this cathode ray tube, first, a negative voltage is applied to the grid (8) with respect to the cathode (7), and a predetermined current is also applied to the heater (6).
When the grid (8) is heated to bring the voltage of the grid (8) close to the potential of the cathode (7), an electron beam (0) is emitted from the cathode (7) toward the fluorescent surface (2). This electron beam QO has a predetermined expansion at a υ angle (θ ) and illuminates the entire surface of the fluorescent surface (2), causing the fluorescent surface (2) to emit light in a color corresponding to the fluorescent substance.

These cathode ray tubes are regularly arranged with the fluorescent surface facing toward you, as shown in FIG. 2, for example. Generally speaking, this arrangement of cathode ray tubes consists of two cathode ray tubes (H) that emit green light, and one cathode ray tube (C) that emits blue light, and one cathode ray tube (C) that emits blue light. The number of green pixels determines the resolution that governs the clarity of images made up of a collection of these light sources, and red and blue only serve to color this. The inventors have already confirmed that this theory is correct by creating a giant display with the arrangement shown in Figure 2. In this way, for example, a system in which a large number of small cathode ray tubes with monochromatic fluorescent surfaces such as red, green, and blue are lined up to display a desired image converts electrical energy μ into light energy. It has many advantages, such as not only the energy conversion efficiency is greatly increased several times compared to a light bulb, but also a light source with any color of emitted light can be obtained by selecting the phosphor used. In this way, when a cathode ray tube is used as a light source for a giant display device, it has better performance, reliability, and
It is clear that the configuration can be advantageous when comparing maintenance costs, power consumption, etc.

On the other hand, cathode ray tubes like the one mentioned above have so far had a diameter of about 29 mm.
When the fins are arranged in the arrangement shown in Figure 2,
The pitch was set at 40 to 45 fi considering outdoor use, the problem of waterproof structure, the structure of the socket part for supplying various voltages to the cathode ray tube, and the convenience of wiring. In this case, the optimum viewing distance in terms of image visibility, degree of color mixing, etc. was about 70.1 or more.

This optimum viewing distance of 70F72 or more is perfectly acceptable for displays installed in stadiums such as baseball stadiums, Zara car tracks, and racetracks, but when considering applications such as outdoor advertising, this viewing distance should be halved. I found out that I needed to.

This invention was made in view of the above-mentioned circumstances, and was made for the purpose of significantly reducing the above-mentioned visual recognition distance compared to the conventional one.

In other words, this method focuses on a method in which a single cathode ray tube emits multiple primary colors by dividing the fluorescent surface of the cathode ray tube, which serves as a pixel, into multiple parts. A plurality of electron guns are provided inside the device to generate unfocused electron beams at a predetermined divergence angle. In a cathode ray tube for a light source, a cylindrical structure with a trimming function is provided, and a fluorescent film emitting colors such as red, green, and blue is coated on the inner surface of a vacuum envelope facing the structure. The inner diameter is σ, the distance from the structure to the phosphor film is l, the maximum diameter of the phosphor film is %, the distance between adjacent phosphor films is %, and the divergence angle of the non-focused electron beam is θ. When, is at a point.

Next, a light source cathode ray tube according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 3, inside a sealed cylindrical vacuum envelope (1), there are arranged a plurality of electron gun sections (4) and corresponding acceleration [poles θυ and cylindrical structure 0 frames]. At the same time, a high voltage pole is arranged at the rear end of the structure (6). In this case, the combination of the electron gun section (4), the accelerating electric current They are provided at three locations at 120 degree intervals inside the vacuum envelope (1), or in each of three horizontal divisions inside the vacuum envelope (1). The former is a delta configuration, and the latter is an infin configuration trichromatic tube.

In addition, on the inner surface of the vacuum envelope (1) facing the body structure, there is a fluorescent film that emits different colors such as red, green, and blue so as to correspond to each body structure (6). Alpha is painted.

In this case, the cylindrical structure (6) has an electron gun section (4
) is generated with a predetermined divergence angle from the cathode (7) of the structure (A). It is necessary to stimulate only the fluorescent film H corresponding to 6) and to avoid stimulating the other fluorescent film Q4 adjacent to this fluorescent film Q. In order for the cylindrical structure UJ to exhibit such an effect, the following conditions are required.

That is, the inner diameter of the structure (b) is d, the distance from the open end of the structure (b) to the phosphor film α corresponding to this structure (one frame) is 41, the maximum diameter of the phosphor film (14) is Dl, and the distance between Fluorescent film Q
C04) When the distance between them is DI, and the angle of divergence of the non-convergent beams a is 0, it is necessary, and preferably, that the following is true.

In the light source cathode ray tube configured in this way, the unfocused electron beam Ql is spread at a predetermined angle υ and the electron gun section (4
), the unfocused electron beam is applied to the inner surface of the vacuum envelope (1) because the beam at its outer periphery is trimmed according to the inner diameter of the cylindrical structure (a) at zero time. Adjacent other fluorescent films Q other than the predetermined fluorescent film 0→
There will be nothing to stimulate you.

That is, by keeping the distance l between the opening end of the cylindrical structure (6) and the predetermined fluorescent surface within the above range, light energy can be efficiently extracted from the predetermined fluorescent surface θ. Moreover, phenomena such as emission of other colors and color mixing due to the non-focusing electron beam are completely eliminated. Therefore, the phosphor film Q4) in such a cathode ray tube is arranged in a delta arrangement or an in-twin arrangement as shown in FIG. In the case of arranging the tubes at the same pitch as in the case of cylindrical structure (Ll Even if the inner diameter of the electron beam or the spread of the unfocused electron beam defines the range of the angle θ, the same effect cannot be obtained because these are in a relative relationship.

Note that metals are normally used as the cylindrical structure for electron beam cooling, but in the present invention, the cylindrical structure (6) can be made of not only metals but also Cefmic and other materials other than metals. Porcelain may also be used.Also, the shape of the opening end located on the fluorescent film θ→ side of the cylindrical structure (6) is rounded or rectangular (
By making the fluorescent film similar in shape to the shape of the opposing fluorescent film, such as a rectangle, a square, or a fan shape, the above-mentioned effects of emitting light of other colors and preventing color mixture are further promoted.

As described above, according to the present invention, a plurality of colors can be obtained using - number of light source cathode ray tubes, and in that case,
The outer periphery of the non-focused electron beam is trimmed by the cylindrical structure, and the non-focused electron beams emitted from the same electron gun irradiate only one phosphor film, resulting in color mixing and other colors. Light emission etc. are reliably prevented. Therefore, accurate beam landing can be obtained, and the viewing distance can be significantly reduced compared to conventional beam landing systems.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a conventional cathode ray tube for a light source, FIG. 2 is a diagram illustrating a structure in which a large number of conventional cathode ray tubes for a light source are arranged side by side, and FIG. 3 is a structural diagram of a cathode ray tube for a light source according to an embodiment of the present invention. Figures 4 and 4 are diagrams in which a large number of light source cathode ray tubes according to embodiments of the present invention are arranged side by side. (1)...Vacuum envelope, (4)...Electron gun section, (7
)...# pole of the electron gun section, QO)...non-convergent electron beam, (6)...structure, α...fluorescent film, d...inner diameter of the structure,! ...Distance from the structure to the fluorescent film, DI.
...Maximum diameter of the fluorescent film, D, ...Distance between adjacent fluorescent films, θ...Angle at which the non-convergent electron beam spreads. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno (1 other person)

Claims (3)

[Claims] (1) Inside the vacuum envelope, a plurality of electron gun sections are provided that generate non-convergent electron beams at a predetermined divergence angle, and each electron gun section corresponding to the electron beam arriving from the cathode of these electron gun sections is provided. A light source is provided with a cylindrical structure having an electron beam trimming function at the position, and a fluorescent film emitting red, green, blue, etc. is coated on the inner surface of the vacuum envelope facing the structure. For cathode ray tubes, the inner diameter of the structure is α, the distance from the structure to the phosphor film is 11, the maximum diameter of the phosphor film is Dl, and the distance between adjacent phosphor films is D11. A cathode ray tube for a light source, characterized in that, where p angle is θ, the following is true. (2) A cathode ray tube for a light source according to claim 1, wherein the cylindrical structure is made of porcelain such as Cefmic. (3) Claim 1 or 2, wherein the shape of the opening end located in the fluorescent imitation of the cylindrical structure is similar to the shape of the fluorescent film facing the opening end. Cathode ray tube for light source as described.