JPS62285338A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To make it possible to divide a picture screen through forming a display effective part and a display non-effective part by selectively forming a phosphor layer in a necessary region. CONSTITUTION:A film is formed with a photo sensitive material on the inside surface of a panel portion of a glass bulb 1, and then a light shielding plate 2 corresponding to an effective part of the panel portion is klaced on the outer surface of the panel portion and the panel portion is exposed by a light source 3 having the wave length corresponding to the photosensitivity. A nonfluorescent material is sprayed inside the glass bulb 1 from a tank 4 which stores the non-fluorescent material by a nozzle 5. After that, clean air controlled by an air pressure controller 7 is sprayed by a clean air nozzle 6 to remove the surplus nonfluorescent material. Next, the glass bulb with the non-fluorescent material stuck to a non-effective part is exposed to a light source 3 from the side of the panel portion to give adhesion to the effective part. Further, the necessary fluorescent material is sprayed from the fluorescent material tank 9 by a nozzle 8 to make fluorescent material stick to the 6 part with adhesion.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Purpose of the invention] (Industrial application field) The present invention relates to a method for manufacturing a tube.

(Prior Art) In general, in cathode ray tubes such as oscilloscopes and radar tubes having a monochromatic fluorescent film, the vacuum envelope (glass bulb) is composed of a glass panel portion, a funnel portion, and a neck portion.

Generally, the panel part and the funnel part are directly welded to each other in order to increase their strength. When applying a fluorescent film to the inner surface of a bulb having such a structure, an aqueous solution containing an electrolyte such as potassium sulfate or barium sulfate is injected with the surface on which the fluorescent film is to be formed facing down. Furthermore,
A mixed suspension 7A';'12 of an aqueous solution containing potassium silicate as the main component is gently injected into the phosphor to precipitate the phosphor and at the same time precipitate a silicate gel substance, which is used as a binder to bind the necessary fluorescence. Forms a film.

(Problems to be Solved by the Invention) This method of forming a fluorescent film has the disadvantage that the film cannot be selectively formed in necessary areas, and therefore the fluorescent film cannot be formed even in non-effective areas.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a cathode ray tube in which a fluorescent film can be selectively formed.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a photosensitive material that becomes sticky when exposed to light on the inner surface of the panel portion of a glass bulb in which the panel portion and the funnel portion are directly welded. A process of coating a substance to form a film, a process of exposing only the non-effective area excluding the display effective area from the inside or outside of the glass bulb, and a process of putting a non-fluorescent substance inside the glass bulb and attaching it to the exposed area. a step of exposing only the effective display area or the area including it; and a step of putting the fluorescent substance inside the glass bulb and attaching it to the exposed area to remove the excess non-fluorescent material. A method for manufacturing a cathode ray tube, comprising a step of removing a fluorescent substance.

(Function) Conventionally, the fluorescent film could not be formed selectively in the necessary areas, so there was a drawback that the fluorescent film was formed even in the ineffective areas. However, according to the present invention, the fluorescent film can be selectively formed It is possible to form a surface. In other words, since a display effective section and a non-display effective section can be formed, the screen can be divided.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

The method for manufacturing a cathode ray tube according to the present invention is shown in FIGS.
It is configured as shown in the figure.

That is, first, as shown in FIG. 1, a photosensitive material is formed into a film on the inner surface of the panel portion of the glass bulb 1 in which the panel portion and the funnel portion are directly welded. Thereafter, a light shielding plate 2 corresponding to the effective portion of the panel section is placed on the outer surface of the panel section, and the panel section is exposed to light by a light source 3 having a wavelength corresponding to the exposure. Then, the photosensitive material becomes sticky only in the exposed areas.

Next, as shown in FIG. 2, the non-fluorescent material is sprayed into the glass bulb 1 from the tank 4 containing the non-fluorescent material using the nozzle 5. At this time, as the non-fluorescent substance, for example, mainly graphite-based fine particles having a particle size of about 5 μm to 2C1 m are used. Thereafter, using the clean air nozzle 6, clean air controlled by the air pressure controller 7 is blown to remove excess non-fluorescent material.

Next, as shown in FIG. 3, the non-fluorescent substance adhered to the non-effective area is exposed to light from the panel side by a light source 3 to expose the effective area and make it sticky.

Thereafter, as shown in Fig. 2, the fluorescent material nozzle 8 is used to spray the necessary fluorescent material from the fluorescent material tank 9 ('f). Then, using the clean air nozzle 6, clean air controlled by the air pressure controller 7 is blown to remove excess fluorescent material.

At this time, the resist used includes, for example, PNN dimethylaminobenzenediazonium zinc chloride, acrylic ester, aluminate propylene glycol ester,
A diazo resist containing a nonionic surfactant or the like can be used.

In the above case, it is sprayed with a non-fluorescent material or a fluorescent material.
When spraying at a pressure of OKg/ci, or removing excess material with air, approximately 1.5K9/ai-3,
It can be removed by spraying with a pressure of 0K9/cri.

Further, in FIG. 2, the nozzles 5, 6, and 8 are shown inserted at the same time, but it goes without saying that each can be inserted independently.

After forming the fluorescent film in this way, air passing through an ammonia atmosphere is blown in to fix it, and the film is completed.

(Modified example) Figures 4 (a) and (b) are examples in which the screen is divided into 4
1 indicates a non-display effective part, and 42.43 indicates a display effective part.

Further, FIG. 5 shows an example in which a conductive non-fluorescent material is coated and fixed not only on the panel section but also on the funnel section region.

[Effects of the Invention] Conventionally, the fluorescent film could not be selectively formed in the necessary areas, so there was a drawback that the fluorescent film was also formed in the ineffective areas. It is possible to form a fluorescent film. In other words, since a display effective section and a non-display effective section can be formed, the screen can be divided.

[Brief explanation of the drawing]

1 to 3 are process explanatory diagrams showing a method for manufacturing a cathode ray tube according to the present invention, and FIGS. 4(a), (b), and 5 are plan and side views showing modified examples of the present invention. be. DESCRIPTION OF SYMBOLS 1... Glass bulb, 2... Light shielding plate, 3... Light source, 4... Tank, 5... Nozzle, 6... Li air nozzle, 7... Air pressure controller 7.8 ...Fluorescent vlJ trade nozzle, 9...Fluorescent material tank. Applicant's agent Patent attorney Takehiko Suzue 3] Figure 1 and Figure 2 7

Claims (1)

[Claims] A step of coating a photosensitive substance that becomes sticky when exposed to light on the inner surface of the panel portion of the glass bulb in which the panel portion and the funnel portion are directly welded; a step of exposing only the non-effective part excluding the display effective part from inside or outside; a step of putting a non-fluorescent substance into the glass bulb and attaching it to the exposed area and removing the excess non-fluorescent substance; The method comprises the following steps: exposing only the effective display area or an area including the effective display area; and placing a fluorescent substance in the glass bulb and attaching it to the exposed area, and removing excess fluorescent substance. A method for manufacturing a cathode ray tube characterized by: