JPS5951434A - Manufacturing method of fluorescent lamp - Google Patents

Abstract

PURPOSE:To aim at improving the working property of the coating and manufacturing of a phosphor body, simultaneously with a reduction of defectives, by welding an upper outer tube whose inner surface is coated with a phosphor film, together with a lower outer tube made up on a separate body provided with a diaphragm partitioning the insides of an electrode and a tubular body. CONSTITUTION:A semispherical upper outer tube 11 is formed and a phosphor is applied to an inner surface of this tube 11 whereby a phosphor film 6 is made up. In addition, a cylindrical body 12 opening both ends is formed with clear glass and a flat-platelike diaphragm 4 is solidly formed at the upside center with clear glass likewise, while a disklike stem 13 interposing supporting wells 3 parted with this diaphragm 4 in between is formed up. Next, after a couple of filament electrodes 2 are connected to the upper end of these wells 3 and support them, the stem 13 is fitted in the lower end of the cylinder body 12 so as to cause the diaphragm 4 to be situated inside the cylinder body 12, then the periphery is welded and a lower outer tube 14 is thus made up. Then, the upper outer tube 11 is welded to the upper end edge of the cylinder body 12 and a lamp body is formed up in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a fluorescent lamp suitable for use as a display element in an electronic display device or a display.

[Technical background of the invention]

Recently, a fluorescent lamp suitable for use as a display element has been devised. As shown in Figures 1 to 5, this fluorescent lamp has a pair of electrodes (21 (
By sealing the 2+, dividing these electrodes (2+ 121, and arranging a partition wall (4) in the tube (1), the tube (1)
) with the bottom (5) of this tube (1) as the turning point.
A character-shaped discharge path is formed, and the tube body (1)
A phosphor film (6) is formed on the inner surface of the bottom (5).

[Problems with background technology]

However, since the structure of a fluorescent lamp with this type of structure is more complex than that of conventional straight tube or ring-shaped fluorescent lamps, it is difficult to integrally mold the tube body (1) using transparent glass or the like. Moreover, when coating the phosphor after molding the tube body (1), a mask must be provided in areas where the phosphor does not need to be coated, which has the disadvantage of complicating the work. Ta. Furthermore, if problems such as uneven coating occur when coating the phosphor after molding the tube (1), the entire tube (1) becomes a defective product.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a manufacturing method that can easily manufacture a fluorescent lamp with a complicated structure.

[W essential of invention]

The present invention includes the steps of forming an upper outer tube having a light film on the inner surface, sealing a plurality of electrodes to the other end of a cylindrical body with one end open, and separating these electrodes and the inside of the cylindrical body. a step of forming a lower outer tube by arranging a partition wall in the lower outer tube; a step of sealing an upper outer tube in the opening of the lower outer tube to form a lamp body; The manufacturing method, which includes the step of encapsulating the phosphor, improves the workability of coating the phosphor, reduces the number of defective products, and improves the workability and economic efficiency of the manufacturing process.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on FIGS. 24 to 8.

First, with a transparent glass, the hemispherical upper outer tube shown in Fig. 4 (
11) is formed, and then a phosphor is applied to the inner surface of this upper outer tube (lη) to form a phosphor film (6).

In addition, a cylindrical body (121) with both ends open as shown in Fig. A disk-shaped stem 〇 is formed by inserting and supporting two wells (3) of the measurement book through the partition wall (4).Next, a pair of filament electrodes +21+21 is connected and supported at the upper end of the well (3). After making it as shown in Figure 6, fit the stem 0 to the lower end of the cylinder α2 and weld the periphery so that the partition wall (4) is located inside the cylinder α2, as shown in Figure 7. A lower outer tube I is formed.

Next, weld the upper outer tube αυ to the upper edge of the cylinder az, and
A lamp body (tS) shown in the figure is formed.

Finally, exhaust the air inside the tube body (1) from the exhaust hole (7) of stem 0, fill it with mercury and inert gas, and then
) is occluded.

Next, the operation of this embodiment will be explained.

The tube body (1) is divided and molded into an upper outer tube αD and a lower outer tube (I4), and after applying a phosphor to the upper outer tube αυ, the upper outer tube I is welded to the lower outer tube α. Therefore, when applying the phosphor, it is not necessary to put a mask on areas that do not need to be applied, and the manufacturing process can be simplified. In addition, even if uneven coating occurs during the application of the phosphor, only the upper outer tube αυ will become unusable as a defective product, and the entire main body a9 will not become unusable, resulting in wasted manufacturing work. It is possible to eliminate this problem and improve economic efficiency.

In addition, since each part is divided and molded and then welded and integrated, it is possible to eliminate uneven coating of the phosphor, and to improve the quality of each outer tube.
Even if damage occurs during manufacturing (4), only the damaged part cannot be used, and the entire main body will not become unusable as would be the case if it was integrally molded, thereby improving economic efficiency.

In addition, in the above embodiment, the filament electrode (21
(Although we have described a fluorescent lamp with one pair of 2+ electrodes and one discharge path, in the case of a configuration in which multiple pairs of filament electrodes, for example, three pairs, are separated by partition walls to provide multiple discharge paths, or Even in the case of a configuration in which a single common electrode is provided, a plurality of opposing electrodes each forming a pair with this common electrode are provided around this common electrode, and these are separated by a partition wall and a plurality of discharge paths are provided. Similar effects can be obtained by manufacturing in the same process as above.Especially when applying phosphors with different luminescent colors depending on the discharge path, it is easy to apply the phosphors. is particularly remarkable.

In addition, if it is necessary to provide a reflective film on the cylinder (121), after molding the cylinder (121), a reflective material such as titania may be applied to the inner surface of the cylinder (121).In this case as well, the upper outer tube Coating work is easy because αυ is not provided integrally.

Further, the mercury may be sealed in the form of amalgam and disposed in the lower outer tube α4 before the sealing of both outer tubes (11) α4, rather than after the two outer tubes α4 are sealed.

Note that since the partition wall (4) is molded separately from the cylinder α2, the side end and the inner surface of the cylinder Q2 are not in close contact with each other, but they are blocked in terms of discharge, so the discharge path is short-circuited. There's nothing to do.

〔Effect of the invention〕

According to the present invention, since the formed phosphor film is applied to the upper outer tube separately from the lower outer tube and then welded to the lower outer tube, the phosphor coating operation can be facilitated.

Additionally, since the upper and lower outer tubes are separate pieces, only one of them will be defective due to damage during molding or a mistake in the application of the phosphor, and the entire tube will be considered defective. Therefore, economical efficiency can be improved.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing fluorescent lamps, Figure 1 is a longitudinal cross-sectional view, Figure 2 is a longitudinal cross-sectional view different from Figure 1, and Figure 3 is a cross-sectional view. Figures 4 and 8 are process explanatory diagrams showing one embodiment of the manufacturing method of the present invention. (2)...Filament electrode, (4)...Partition wall, (6)
... Phosphor membrane, Qfi... Upper outer tube, a4) - Lower outer tube, α9... Lamp body. September 17, 1980 Inventor Nao Kaneko Konma
Oka 1) Shigeru Patent Applicant Toshiba Electric Materials Corporation Sou

Claims (1)

[Claims] (1) Forming an upper outer tube having a phosphor film on the inner surface, sealing a plurality of electrodes to the other end of a cylindrical body with one end open, and dividing these electrodes and the inside of the cylindrical body. a step of forming a lower outer tube by arranging a partition; a step of sealing an upper outer tube into the opening of the lower outer tube to form a lamp body; and a step of injecting mercury and an inert gas into the lamp body. A method for manufacturing a fluorescent lamp, comprising the steps of: encapsulating the lamp;