JPS62278724A - Manufacture of circular fluorescent lamp - Google Patents

Abstract

PURPOSE:To keep off a temperature rise in and around sealing part so as to prevent any deformation in and around the sealing part from occurring, by cooling a nearby spot of the sealing part of an electrode part at the side to be turned to the underside at the time of bulb bending. CONSTITUTION:A cooling system is made up to a fluorescent lamp 1 before bulb bending, sealing an electrode aprt at both ends of a glass bulb, water 2 to be spouted out of a nozzle, a tray 3 for receiving this water, a pump 4 feeding cooling water, a tank 5 storing this cooling water and using it for circulation, a conveying pump 6, and a pipe 7 recovering the cooling water overflown. With this system, such a part that is turned to the downside at the time of bulb bending is wet with water. With this constitution, any deformation A in and around an electrode at the time of the bulb bending is preventable from occurring.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of manufacturing an annular fluorescent lamp, and particularly to a method for controlling the temperature of the electrode sealing part on the lower side when the tube is bent. The present invention relates to a method of manufacturing a ring-shaped fluorescent lamp suitable for preventing rising.

[Conventional technology]

In the prior art, the closest known example to the present invention is Japanese Patent Publication No. 60-22467. This document discloses that cooling air is blown out from the tip of the tube support that supports the lower portion when the tube is bent to cool the electrode sealing portion of the lower portion.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, the glass tube is heated in a heating furnace in the pre-bending position, and only comes into contact with the tube holder when it is stretched, and the cooling time is sufficient. Instead, it caused deformation. More specifically, in recent years the glass tube material for ring-shaped fluorescent lamps has been changing from lead glass to soda glass in order to reduce costs, and the glass chamber temperature when the tube is bent has a softening temperature of 50 to 100 degrees Celsius compared to lead glass. Rose. On the other hand, the material of the glass tube of the flare that forms the electrode part, that is, the mount, is made of lead glass, which is the same as in the past, due to its workability. For this reason, since the area near the sealing part is made of lead glass with a short softening length, deformation is likely to occur due to the pressure of the nitrogen gas filled in when the tube is bent, causing problems in terms of lamp characteristics and yield.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing an annular fluorescent pump that can prevent a rise in temperature near the sealed portion in a heating furnace.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method in which a glass tube is loaded into a tube bending machine, and before entering a heating furnace or before being loaded into a tube bending machine, for example, a conveyor or the like. A nozzle is provided at the lower end of the glass tube, and a liquid such as water is spouted from the nozzle to wet the area near the sealing area with water, thereby preventing a rise in temperature near the sealing area in the heating furnace. This is what I did.

[Effect]

In other words, by wetting the area near the seal with water, the temperature rise in the area near the seal due to the heat of vaporization is slower than in other areas, which causes deformation in the area near the seal when filling with nitrogen in the furnace or during tube bending. There's nothing to do.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an external view showing how the lower portion of the tube is deformed during bending.

FIG. 1 is a diagram showing a cooling device according to the present invention, in which 1 is a fluorescent lamp with electrodes sealed at both ends of a glass tube before the tube is bent;
2 is water spouted from a nozzle, 3 is a toy for receiving water, 4 is a pump for sending cooling water, 5 is a tank for storing and circulating cooling water, 6 is a water pipe, 7 is overflowing cooling water It is a pipe that plays a number of songs.

As shown in the figure, according to this embodiment, deformation A in the vicinity of the electrodes during bending of the tube could be prevented by wetting the lower portion of the tube with water.

Note that the liquid to be applied may be water in which alumina or the like is suspended instead of water. Alternatively, a highly concentrated paint or the like may be applied.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an apparatus for implementing the manufacturing method according to the present invention, and FIG. 2 is an external view of a lamp bulb for explaining deformation when the tube is bent. 1...Glass tube, 2...Gushing water, 3...Toy, 4
...pump, 5...tank, 6,7...pipe. 7--, l.

Claims (1)

[Claims] 1. After sealing electrode parts to both ends of the glass tube whose inner surface is coated with phosphor paint, the tube bending step is performed in a tube bending step for bending the glass tube into an annular shape or in a step before that. 1. A method for manufacturing an annular fluorescent lamp, characterized in that the vicinity of the sealed portion of the electrode portion on the lower side is cooled or coated with water or other substance.