JPS60207230A - Manufacture of braun tube - Google Patents

Abstract

PURPOSE:To obtain a satisfactory effect of irradiated lamp light despite the figures are formed by exposure method by using an organic group resin as photo-setting photosensitive material and burning the material in oxidizing atmosphere as the after treatment. CONSTITUTION:A suspension of a photo-setting photosensitive material including a pigment is injected onto the inner surface of a face-plate 2 and left as it is for a while and after a desired figure 3 is formed an after treatment is carried out. In this manufacturing method of Broun tubes, an organic group resin is used as the photo-setting photosensitive material and burning in an oxidizing atmosphere is made as an after treatment. As said photo-setting photosensitive used is such as a mixture of a proper quantity of polyvinyl pyrrolidone, an organic high molecular water-soluble resin, as the organic group resin and water-soluble bisazide as the photosensitive material. Since the photo-setting photosensitive material of an organic group resin is lost by pyrolisis in the burning process after forming figures, extremely favorable figures of scales and letters can be obtained by means of the exposure method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a cathode ray tube, and more particularly to a method of manufacturing a cathode ray tube having figures such as scales and letters on the inner surface of its face panel.

[Technical background of the invention and its problems]

In recent measuring instruments such as oscilloscopes that use cathode ray tubes, the
A structure is adopted in which figures such as scales and letters are formed and a fluorescent substance is provided in contact with the figures. This is to prevent errors occurring between the light emitting part of the fluorescent substance and the figure. This figure is also black and red to highlight the characteristics of the measuring instrument.

Various colors such as white are used.

Next, an example of this cathode ray tube will be explained with reference to FIGS. 1 and 2.

That is, the face panel (2) of the cathode ray tube envelope (1)
), for example, a scale (3) as a figure is formed on the inner surface of the face panel (2), including the top of this scale (3).
A fluorescent material layer (4) is formed on the inner surface of the material, and a metal back layer (5) made of a vapor-deposited layer of aluminum is further formed thereon.
is formed. However, there are also cathode ray tubes that do not have this metal back layer (5). Generally, a lamp case (6) is attached to the upper side of the cathode ray tube, and a lamp (7) is housed within this lamp case (6). The light emitted from this lamp (power) enters the side of the face panel (2), illuminates the scale layer (3), and is reflected depending on the color of this scale layer (3) and the material used. When viewed from the front as shown in , the scale layer (3) is clearly displayed, and the relationship between the scale (3) and the measurement display, such as a waveform, drawn on the fluorescent substance 1m (4) can be accurately measured. Or,
They are supposed to take photos.

However, there are two methods for producing this scale (3): a transfer method and an exposure method. Then, this printed matter is transferred and printed on the face panel (3) in the same manner as a copying picture. ~0.3 myth
At present, the latter exposure method is mainly used because of problems such as deterioration of accuracy such as bending, occurrence of defects such as line breakage, and furthermore, a large number of manufacturing steps and high cost.

This exposure method has conventionally been generally formed through the following steps.

That is, a suspension of a pigment powder of a desired color mixed into an inorganic metal-based photocurable photosensitizer made of, for example, polyvinyl alcohol (PVA) and ammonium dichromate (ADC) is placed on the inner surface of the face panel. After being left to dry, an optical mask with a desired pattern is placed on the outer surface of the face panel, and the outside of the optical mask is irradiated with exposure light to form a pigment layer with the desired pattern on the inner surface of the face panel. Any desired color can be obtained by appropriately selecting a pigment of a desired color. For example, appropriate cobalt powder for black, ferric oxide powder for red, and titanium dioxide powder for white.

However, although this exposure method has greatly improved dimensional accuracy and man-hours compared to the transfer method, its functionality is inferior to the transfer method, and there are cases where problems may arise when using the exposure method. .

The disadvantage of this is that the formed light reflection characteristics reduce the effect of the light rays irradiated by the lamp (7), as shown in Figures 1 and 2, and the scale layer (3) becomes clearly visible during photography, etc. Most of the time it doesn't come out. Generally, when the pigment is white or red, the pigment itself has a light reflecting effect by adding a small amount of white pigment, but as mentioned above, in the exposure method, ADC is used as a photocurable photosensitizer.
This ADC uses inorganic metals such as
This is because the entire pigment is colored in the red or deep orange color of the ADC itself, so that the reflective effect of white pigments and pigments that have a reflective effect is also reduced. As a countermeasure to this problem, attempts have been made to reduce the amount of ADC used as much as possible, but this reduces the adhesive strength of pigments,
Problems such as the extension of the exposure time and the resulting increase in line width variations were unsatisfactory.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and although the figure is formed by an exposure method, the effect of light rays irradiated by a lamp is also satisfactory. The purpose of the present invention is to provide a method for manufacturing a cathode ray tube that can obtain good results even when photographing.

[Summary of the invention]

That is, the present invention comprises at least a step of injecting a suspension of a photocurable photosensitizer containing a pigment onto the inner surface of the face panel, a step of forming a desired figure by an exposure method, and a post-processing step. In the manufacturing method of cathode ray tubes, the photocurable photosensitizer is an organic resin type and the post-processing process includes a baking process in an oxidizing atmosphere, and the photocurable photosensitizer is an inorganic metal type and the post-processing process includes a baking process in an oxidizing atmosphere. This invention consists of two inventions: one that includes a step of immersing in an alkaline solution.

[Embodiments of the invention]

After forming a desired pattern on the inner surface of the face panel by a conventional exposure method using a photocurable photosensitive agent using ADC, the inventors carried out the following steps: 1) changing the red or deep orange color of ADC to white; 2) As a result of conducting various experiments and studies on methods for removing ADC, we found the following: ◇ That is, regarding 1), it was found that human DC is different in color. As mentioned above, the color of ADC is reddish in an acidic liquid, but in a chilucalic liquid, it appears pale yellow or almost transparent, depending on the concentration. Unfortunately, however, the suspension of the photocurable photosensitizer is an acidic liquid, and if it is neutralized or made alkaline with an alkali, its function will be insufficient and it will be difficult to achieve the desired purpose. . As a result of various experiments, the inventors found that the photocurable photosensitizer is a suspension of the same polyvinyl alcohol (PTA) and ammonium dichromate (ADO) mixed with pigment powder of the desired color. After forming a figure using a liquid, the color of the ADC can be changed to white by dipping it in an alkaline part* in the post-processing process, and for example, the scale (3) can be made clear. Ta.

Next, the conventional process and the process of the present invention will be compared.
Washing with water → drying Invention process Injection of suspension → Stabilization of liquid C) → Exposure → Removal of liquid → Washing with water → Injection of alkaline liquid → Removal of liquid → Washing with water → Drying As this alkaline solution should be used, as much as possible should not be left behind. is desirable. Therefore, a solution of caustic soda or ammonia with a concentration of about 1% is sufficient.

For example, 10% lPVA75gr as a suspension,
Good results were obtained by using a mixture of 75 grams of ethyl alcohol, 2 grams of ADC, and 2 grams of titanium dioxide as a white pigment, and using 1 hour soda solution for the injection of alkali solution after exposure, liquid removal, and water washing.

Next is 2) to remove the ADC, but this is extremely difficult, and if done incorrectly, the formed figure may also be removed, and the chromium in the ADC may turn black due to chromium oxide. Things get worse and worse.

Therefore, the inventors considered not using an ADC. As a result, it was found that it is effective to use a resin-based material instead of an inorganic metal-based material such as ADO.

This is because organic resin-based materials have the advantage that if they are fired after pattern formation, they will thermally decompose and disappear. For example, the desired object has been achieved by appropriately blending and using an organic polymeric water-soluble resin, such as polyvinylpyrrolidone, as the organic resin system, and a water-soluble bisazide as the photosensitizer. However, in this case, firing is required after the pattern is formed, and it goes without saying that the atmosphere for this firing must be an oxidizing atmosphere.

〔Effect of the invention〕

As described above, according to the method of manufacturing a cathode ray tube of the present invention, extremely good figures such as scales and characters can be obtained by the exposure method.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing an example of a cathode ray tube.
FIG. 1 is a partially cutaway side view, and FIG. 2 is a front view. 1...Envelope 2...Face panel 3...Graduation 4...Fluorescent material layer 5...Metal back layer 6.Lamp case 7...Lamp agent Benekishi Inoue - Man

Claims (2)

[Claims] (1) A cathode ray tube comprising at least the steps of injecting and leaving a suspension of a photocurable photosensitizer containing a pigment on the inner surface of the face panel, forming a desired pattern using an exposure method, and a post-processing step. A method for producing a cathode ray tube, wherein the photocurable photosensitizer is an organic resin type, and the post-treatment step includes a firing step in an oxidizing atmosphere. (2) Manufacture of a cathode ray tube comprising at least the following steps: injecting and leaving a suspension of a photocurable photosensitizer containing a pigment on the inner surface of the face panel, forming a desired figure using an exposure method, and post-processing. A method for producing a cathode ray tube, wherein the photocurable photosensitizer is an inorganic metal-based material, and the post-treatment step includes a step of immersing it in an alkaline solution.