JP2000048742A - Projection cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube which is capable of discriminating a color, etc., of a phosphor by a common HV(High Voltage) carbon pattern, and improving the efficiency in manufacture. SOLUTION: A screen panel 130 is fitted to a forward opening part of a glass tube body 110. An HV carbon film 160 is formed inside the screen panel 130, a phosphor film 170 is formed on its inner side, and an aluminum deposition film 180 is formed on its further inner side to form a fluorescent surface 150. Three window parts 200A, 200B, 200C are provided on an upper part of the HV carbon film 160. A phosphor is selectively applied to three window parts 200A, 200B, 200C according to the color and kind of the phosphor. The color and the kind of the phosphor are judged by visually checking from the outside of the screen panel 130 whether or not the phosphor is applied to the window parts 200A, 200B, 200C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projection type cathode ray tube used for various projectors and the like.

[0002]

2. Description of the Related Art Conventionally, in the case of a projection type cathode ray tube,
Red (Red), Green (Gr)
E.en) or blue (Blue) phosphor is applied by a single color, and it is necessary to identify the color of the phosphor of each cathode ray tube from outside. If the cathode ray tube is illuminated, the colors can be distinguished, but the phosphors themselves are all white and cannot be distinguished in appearance. Therefore, conventionally, FIG.
As shown in FIG. 4, the HV (high voltage) carbon film 12 on the phosphor screen 10 itself has characters 14 for identifying red, green and blue, that is, "R" for red (FIG. 4A) and "G" for green. (Fig. 4
(B), the letter 14 of "B" (FIG. 4 (C)) is formed for blue so that it can be visually recognized from the outside of the screen panel 16. FIG. 4D shows the HV carbon film 12.
FIG. 4 is an enlarged view showing a letter “R” formed in FIG.

[0003]

However, when the characters are formed on the carbon film itself as described above, in the process of forming the HV carbon film and then forming the phosphor film in the manufacturing process of the phosphor screen, The color of the phosphor is determined corresponding to the character 14 for identification. For this reason, in order to increase the mass production effect, it is necessary to continuously produce monochromatic phosphors, which increases the stock amount. For example, as shown in FIG.
When making a cathode ray tube of color, the HV marked with “R” on the first day
Producing a cathode ray tube having a carbon film and a red phosphor film,
On the second day, a cathode ray tube having an HV carbon film marked with “G” and a green phosphor film was prepared. On the third day, a cathode ray tube having an HV carbon film marked with “B” and a blue phosphor film was prepared. If you do
A kit of three cathode ray tubes of red, green, and blue will be ready for the first time on the third day, and two types of cathode ray tubes manufactured by the second day must be kept in stock.

Further, if it is attempted to produce a three-color cathode ray tube in one day to reduce inventory, it is necessary to change the HV carbon printing pattern three times a day. This is a very inefficient process because of the need. In addition, not only when a new cathode ray tube is manufactured, but also in a reproduction process in the case where a phosphor coating failure occurs, the color of the phosphor is determined in accordance with the identification character formed on the HV carbon film, The degree of freedom in manufacturing is alienated.

Accordingly, an object of the present invention is to identify the color and the like of a phosphor by a common HV carbon pattern.
An object of the present invention is to provide a projection type cathode ray tube capable of improving the efficiency of production.

[0006]

In order to achieve the above object, the present invention provides a projection type cathode ray tube in which an HV carbon film is formed on an inner surface of a screen panel and a phosphor film is formed inside the HV carbon film. A window for identification is provided at a predetermined position of the HV carbon film, and the projection type is visually recognized from the outside of the screen panel depending on whether or not the phosphor film is selectively applied corresponding to the window. The cathode ray tube is identified.

In the projection type cathode ray tube of the present invention, when forming the HV carbon film on the inner surface of the screen panel, one or more identification windows are provided at predetermined positions of the HV carbon film. This is assumed to be common to each cathode ray tube regardless of the color and type of the phosphor film. Thereafter, when the phosphor film is formed inside the HV carbon film, the phosphor is selectively applied corresponding to the window of the HV carbon film based on the color and type of the phosphor film. Therefore, by visually determining from the outside of the screen panel whether or not the fluorescent material is applied to the window, the fluorescent material of the projection type cathode ray tube can be identified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the projection type cathode ray tube according to the present invention will be described below. 1A and 1B are diagrams showing a structural example of a projection type cathode ray tube according to the present invention, wherein FIG. 1A is a cross-sectional view, and FIG. This projection type cathode ray tube (P
J tube) has a frit glass portion 120 at the front opening of a glass tube main body 110 having a neck portion 100 integrally provided at the rear end.
The screen panel 130 is mounted via the. An anode film 112 is provided on the inner surface of the glass tube main body 110, and an electron gun 140 having a cathode is arranged on the neck portion 100.

A fluorescent screen 150 is provided on the inner surface of the screen panel 130, and is irradiated with an electron beam 142 from an electron gun 140, emits light of a color corresponding to the phosphor, and irradiates a screen (not shown). The phosphor screen 150 is formed by forming an HV carbon film 160 on the inner surface of the screen panel 130, forming a phosphor film 170 inside the HV carbon film 160, and further forming an aluminum deposition film 180 thereon. The glass tube body 110 is provided with an anode button 190,
It is connected to the HV carbon film 160 via the V connector 192.

That is, in this projection type cathode ray tube,
The high voltage (HV) applied to the anode button 190 of the glass tube main body 110 is supplied to the screen panel 130 via the HV connector 192. The HV carbon film 160 is equivalent to the contact portion of the HV connector 192 on the screen panel 130 side. As shown in FIG. 1B, the HV carbon film 16
Numerals 0 are arranged in a rectangular frame shape so as to protrude from the outer periphery of the phosphor screen 150. The HV carbon film 160 is printed and applied on the inner surface of the screen panel 130 by plate making, and then a phosphor is applied to form a phosphor film 170. As a method of applying the phosphor, there are methods such as printing and slurry. Further, aluminum is vapor-deposited thereon to form an aluminum vapor-deposited film 180.

HV supplied to HV carbon film 160
The aluminum vapor deposition film 180 makes it possible to increase the pressure of the entire phosphor screen 150, attracts the electron beam 142 emitted from the cathode of the electron gun 140, and causes the phosphor to emit light by this energy. In addition, in such a projection type cathode ray tube, any one of red, green and blue phosphors is applied in a single coating, and the three cathode ray tubes of red, green and blue are used to project a lens onto a screen by lens projection. Color matching,
Three sets of cathode ray tubes are required for each set. For this reason,
It is necessary to identify the color (kind) of the phosphor, which is indistinguishable in appearance in terms of manufacturing and management.

In this embodiment, as shown in FIG.
Three rectangular windows 200A, 200B, and 200C are provided above the V carbon film 160 and have a size such that the windows 200A, 200B, and 200C are visible from the outside. The color (type) of the phosphor can be determined by visually recognizing whether or not the phosphor has been applied from the outside of the screen panel 130. That is, the HV carbon film 160 of this example
Is printed and applied by a common plate making in each cathode ray tube regardless of the color (type) of the phosphor, and three windows 200A, 200B, 20 are provided at common positions in each cathode ray tube.
It has 0C.

In this embodiment, three windows 200A,
The color (type) of the phosphor of the cathode ray tube can be determined depending on whether or not the phosphor film 170 is applied corresponding to 200B and 200C. As described above, the phosphor appears white to the naked eye irrespective of red, green, or blue. Therefore, the windows 200A, 200B,
00C is visible white from the outside of the glass screen panel 130. Therefore, the three windows 200A, 200B, and 200C described above are used to change the color (type) of the phosphor.
By selectively applying according to and filling with phosphor,
The color of the cathode ray tube can be easily discriminated from the outside, and it is not necessary to change the pattern of the HV carbon film 160 as in the prior art, so that the manufacturing process can be shared and the inventory can be reduced.

FIG. 3 shows three windows 200A, 200B,
It is explanatory drawing which shows the specific example of the color identification method using 200C. As shown in the drawing, when the phosphor is applied, for example, in the case of red, only the right window 200A is filled with the red phosphor as shown in FIG. In the case of green, FIG. 3 (B)
As shown in FIG. 7, only the left window 200C is filled with a green phosphor. In the case of blue, as shown in FIG.
The phosphor is not applied to any of the two windows 200A, 200B, and 200C. Thus, the three windows 200
The color of the phosphor can be determined based on the application state of the phosphor to A, 200B, and 200C.

Further, as shown in this example, three windows 200 are provided.
When A, 200B, and 200C are provided, eight combinations are possible depending on whether or not the phosphor is applied. In addition to the three colors, the combinations can be used for five more types. Therefore, for example, as shown in FIG. 3D, another identification can be performed by another combination. For example, since there are a plurality of types of phosphors used for the projection type cathode ray tube even in the same color, the window portions 200A, 200B, and 2D described above are also used for selecting such types of phosphors.
00C can be used as well.

HVs having a common pattern as described above
A carbon film 160 is provided, and depending on whether or not phosphor is applied,
By making the color (type) of the phosphor film 170 identifiable, the process of forming the HV carbon film 160 in the projection type cathode ray tubes having different colors (types) of the phosphor can be made common, and the production efficiency can be improved. And the inventory of projection type cathode ray tubes can be reduced. In other words, the HV carbon film 160 can be continuously manufactured using a common plate making process regardless of the color (type) of the phosphor. And the phosphor film 1
70, the common HV carbon film 160
By changing the application area of the screen panel 130 provided with the phosphor according to the color (type) of the phosphor, the projection type cathode ray tube in which the phosphor can be identified can be efficiently manufactured. .

Therefore, for example, as shown in FIG. 5B, the screen panel 130 provided with the common HV carbon film 160 has a red phosphor → a green phosphor → a blue phosphor → a red phosphor. It is also possible to produce the projection type cathode ray tubes one by one, one by one, as shown in FIG. In addition, not only when a new cathode ray tube is manufactured, but also when a phosphor coating failure occurs, a common HV carbon film 1 is used.
For the screen panel 130 provided with 60, it is only necessary to redo the production of the phosphor film 170 in the application region according to the color (type) of the phosphor, and a highly flexible manufacturing operation can be realized.

In the above example, three rectangular windows 200A, 200B, and 200C are provided. However, if only three types of colors are identified, it is sufficient to provide two windows. Also, instead of providing a plurality of windows, for example, a long window is provided in the horizontal direction, and the position where the phosphor is applied is changed according to the color of the cathode ray tube (for example, the right half, the left half), so that the fluorescent light is emitted. The color and type of the body may be identified. That is, the colors (types) of the phosphors that can be recognized using one window are not necessarily two kinds, and three or more kinds of discrimination can be made in one window. Further, instead of providing a plurality of windows having a common shape as described above, windows having different shapes may be provided, and the phosphor may be selectively applied. For example, by providing an elliptical window portion or a star-shaped window portion, the identification content and the window shape can be associated with each other and made to be imaged by an operator, and identification can be performed more easily and reliably. is there.

[0019]

As described above, in the projection type cathode ray tube of the present invention, a window for identification is provided at a predetermined position of the HV carbon film, and a phosphor film is selectively applied corresponding to the window. Depending on whether or not the projection type cathode ray tube is visible from the outside of the screen panel, the projection type cathode ray tube is identified. Therefore, while making the process of forming the HV carbon film in the projection type cathode ray tube common, the projection type cathode ray tube can be identified, and the efficiency of production and management can be improved.
It becomes possible to reduce the stock of projection type cathode ray tubes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structural example of a projection type cathode ray tube according to the present invention, wherein (A) is a cross-sectional view and (B) is a front view.

FIG. 2 is a front view showing an example of a window provided on an HV carbon film in the projection type cathode ray tube shown in FIG.

FIG. 3 is an explanatory diagram showing a specific example of a color identification method using three windows in the projection type cathode ray tube shown in FIG.

FIG. 4 is a front view showing a color identification method in a conventional projection type cathode ray tube.

FIG. 5 is an explanatory diagram showing an example of a work schedule when manufacturing the projection type cathode ray tube shown in FIG.

[Explanation of symbols]

100: neck part, 110: glass tube body, 120
…… Frit glass part, 130 …… Screen panel,
140: electron gun, 150: phosphor screen, 160: HV
Carbon film, 170 phosphor film, 180 aluminum deposition film, 190 anode button, 192 HV connector, 200A, 200B, 200C window.

Claims (6)

[Claims] 1. A projection type cathode ray tube having an HV carbon film formed on an inner surface of a screen panel and a phosphor film formed inside the HV carbon film, wherein a window for identification is provided at a predetermined position of the HV carbon film. The projection type cathode ray tube is identified by visual recognition from the outside of the screen panel depending on whether or not the phosphor film is selectively applied corresponding to the window portion. Type cathode ray tube. 2. A screen having a plurality of said windows, wherein a phosphor film is selectively applied in correspondence with said plurality of windows, and a combination of said windows coated with said phosphor film is provided outside said screen panel. 2. The projection type cathode ray tube according to claim 1, wherein the projection type cathode ray tube is identified by visual recognition from a user. 3. The projection type cathode ray tube according to claim 1, wherein the phosphor film is any one of red, green, and blue phosphor films. 4. The projection type cathode ray tube according to claim 1, wherein a metal deposition film is further provided inside the phosphor film. 5. The projection type cathode ray tube according to claim 1, wherein the identification is for identifying a color of the phosphor. 6. The projection type cathode ray tube according to claim 1, wherein the identification is for identifying a type of the phosphor.