JPS5844647A - Manufacturing method of fluorescent lamp - Google Patents

Abstract

PURPOSE:To remove a phosphor film without damaging the inner surface of a glass tube by relatively revolving a sponge-type elastic body in which a liquid is impregnated while pressing it and providing a process that removes the phosphor film. CONSTITUTION:To remove a phosphor film 1 from the inner surface of a tube end 3, the phosphor film 1 at the end 3 is removed by pushing up a sponge 4 in which water is impregnated amply while holding it on a holder 5 and revolving it while biting it into the end 3. Then the sponge 4 and the holder 5 drop to the original position while they are revolving. Since the sponge 4 is an elastic body, it returns to the original shape when it is separated from the end 3. Subsequently, water 7 is jetted from a nozzle 6 on the top of the sponge 4 which falls and the phosphor on the sponge 4 is washed and collected . Since the cross section from which the phosphor film 1 is removed has no difference in level, the phosphor film 1 after it is manufactured has no peeling. Besides, the phosphor on the sponge 4 is carried to a separate container by water and can be precipitated and collected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a fluorescent lamp, and particularly to a process for removing a phosphor film from the ends of glass tubes of a fluorescent lamp.

Generally, in the manufacture of fluorescent lamps, it is necessary to remove the portions of the phosphor film deposited on the inner surface of the glass tube, at which the mounts are attached to both ends, before attaching the mounts.

Conventionally, the phosphor film at the end of a glass tube with a phosphor film coated on the inner surface was removed by tapping the phosphor film at the end of the tube with a metal wire brush, or by removing the phosphor film at the end of the tube with a metal wire brush. One of the methods adopted is to use a plate to wipe off the phosphor film at the end of the tube.

In such a conventional method, as shown in FIG. 2, the removed boundary 8 of the phosphor film 1 becomes a step, which causes peeling of the phosphor film 1 after completion. This caused defects. Further, when a wire brush is used, the inner surface of the end portion 3 of the glass tube 2 is scratched, and problems such as cracks occur due to the scratches.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a fluorescent lamp in which the phosphor film at the end of the glass tube can be removed without damaging the inner surface of the glass tube or creating a step in the phosphor film. It's about doing.

In order to achieve the above object, in the present invention, a sponge-like elastic body impregnated with liquid is pressed against the tube end of a glass tube whose inner surface is coated with a phosphor film, and the tube is relatively rotated. This invention is characterized in that the fluorescent lamp is manufactured by including a step of wiping off the phosphor film adhering to the inner surface of the end portion.

The characteristic manufacturing method of the present invention prevents damage to the inner surface of the end of the glass tube, and also eliminates the occurrence of steps in the phosphor film. As a result, it is possible to prevent cracks at the end of the glass tube and peeling of the phosphor film, thereby significantly improving productivity.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1(a), Φ) shows the basic structure of an apparatus for carrying out the method of manufacturing a fluorescent lamp according to the present invention.

Usually, when a phosphor film 1 is applied to the inner surface of a pulp for a fluorescent lamp (glass 2) and a mount is sealed to the end 3 of this pulp 2, the phosphor film 1 applied to the end 3 is If the "light body film" was not completely removed, it would be burned into the sealing part and cause cracks, etc. Therefore, as a pre-sealing process, the edge part 3 of the pulp 2 was removed. It is necessary to remove the phosphor film 1. For this reason, conventionally, the phosphor film 1 on the end portion 3 of the pulp 2 has been removed using a wire brush, a wiping rubber, etc. as described above. Therefore, as shown in FIG. 2, in addition to the formation of a step 8, there were also problems such as cracks occurring due to scratches caused by the wire brush, and furthermore, the phosphor was scattered and could not be recovered.

On the other hand, in the method for manufacturing a fluorescent lamp according to the present invention, as shown in FIGS. The phosphor film 1 on the end 3 is wiped off by pushing up the sponge 4 while it is held in the holder 5 and rotating it while it is embedded in the end 3 (see figure (a)). )). Then, the sponge 4 and the holder 5 descend while rotating to their original positions.

Since the sponge 4 is an elastic body, it returns to its original shape when separated from the end 3. Next, water 7 is jetted from the nozzle 6 onto the upper surface of the descended sponge 4 to wash away and collect the phosphor on the sponge 4 (FIG. Φ)). According to this method, as shown in FIG. 3, the wiped cross section of the phosphor film 1 has no steps 9, so there is no peeling of the phosphor film 1 after completion, and the phosphor film 1 on the sponge 4 does not peel off. It is now possible to transport the body and water to a separate tank and collect it by settling. Furthermore, since the inner surface of the end portion 3 is simply rubbed by the sponge 4, no scratches occur.

Note that any sponge-like elastic body can be used instead of the above-mentioned sponge. Also, other liquids may be used instead of the water mentioned above. Furthermore, instead of rotating the sponge, the pulp may be rotated.

As explained above, according to the manufacturing method of the present invention, the phosphor film can be removed without damaging the inner surface of the glass tube. Furthermore, since the inner surface of the glass tube is not scratched, the number of defects caused by cracks during sealing can be greatly reduced.

In addition, the wiped boundary of the phosphor film does not form a large step, which eliminates peeling of the film after completion, and the removed phosphor film is carried to a tank with water where it settles and regenerates. This made it possible to do this, and it was also very effective in terms of recovering the phosphor.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are operational status diagrams of a device for wiping off a phosphor film at the tube end in the method for manufacturing a fluorescent lamp according to the present invention, and FIG. FIG. 3 is a diagram showing a cross section of the tube end after the film has been removed. FIG. 3 is a diagram showing a cross section of the tube end after the phosphor film has been removed according to the present invention.

Claims (1)

[Claims] 1. A sponge-like elastic material impregnated with a liquid is pressed against the end of a glass tube, the inner surface of which is coated with a phosphor film, and rotated relative to the end of the glass tube to adhere it to the inner surface of the end of the tube. A method for manufacturing a fluorescent lamp, comprising the step of wiping off a phosphor film.