JPS60220532A - Manufacturing method of annular fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent producing processes on a lamp bulb and obtain a high quality lamp steadily without reducing exhaust speed of air by coating the periphery of bent portions of an exhaust tube with a infrared ray reflecting material in the preprocess of annular shaping of the bulb. CONSTITUTION:Stems 3, 4 provided with an electrode respectively are sealedly fitted with a sealing machine 50 to both ends of a bulb 1 coated with a fluorescent material 2 on its soda glass surface on a conveyer 51, and ring shape concave grooves 9, 10 are formed at the sealed portions, and after forming Nos. 1 and 2 bent portions 7, 8 on an exhaust tube 5 on a conveyer 51, an infrared ray reflecting material such as fluorescent material is coated on the outer surface of the tube 5 near the Nos. 1 and 2 bent portions 7, 8. The straight bulb 1 thus produced is nippingly held by a plurality of holders equally spaced on a intermittently moving body 53 at the formed portion 9 so that the bottom end of the bulb 1 is to be free. The bulb 1 is moved by the intermittent rotation of the moving body 53, gradually heated by a preheating furnace 55 with the inside gas being exhausted, fed with N2 gas at a N2 filling position 56, and heated by a heating furnace 57 up to an optimumly softened state for the annular shaping. The bulb is then transferred to an annular shaping position 58.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a method of manufacturing an annular fluorescent lamp.

[Prior art]

Generally, this type of annular fluorescent lamp has been manufactured by a process as shown in FIG. 1, for example. That is, as shown in FIG. 2, first, the palugs A3 and 4, which are provided with electrodes at both ends, and which are coated with a fluorescent film 2 on the inner surface of the pulp 1 are sealed, and an annular recess 9 is formed in the sealing part. . Holter mounted at intervals
(not shown), clamp the upper molding part 9 so that the lower end of the pulp is free.

Then, the linear pulp is transferred by the intermittent rotation of the intermittent moving body 53, and gas is released and exhausted while increasing the temperature in the preheating furnace 55, and before the pulp reaches the softening temperature, N,
N is fed into the filling tube 56 and while the pressure inside the tube is controlled, the tube is heated in a heating furnace 57 to a softened state that is optimal for bending. After bending, remove the impurity gas in the pulp,
Inert gas.

Ring-shaped fluorescent lamps were manufactured through processes such as mercury filling.

Conventionally, the pulp material for annular fluorescent lamps had a lead content of 2.
So-called lead glass, which has a weight percentage of 1% to 29%, was widely used because it was easy to process, but it is currently being used due to rising costs due to countermeasures against environmental pollution caused by the production of lead glass. Low-lead glass with reduced lead content or soda glass used in straight tube fluorescent lamps has come into widespread use.

However, since the softening temperature K of soda glass, which is a substitute for lead glass, is about 100° C. higher than that of lead glass, the working temperature i must also be measured, and the furnace temperature must naturally be set high. However, since the stem is made of lead glass which has good workability, when the temperature of the furnace rises, the exhaust pipe 5 is heated together with the pulp l in the furnace 14 as shown in FIG. In the case of a gas furnace, the temperature around the trachea 5 is high due to convection.
The second bent portion 8 is easily dented due to vacuum heating.

If heated gas is vented in such a state, the first
Bent portion 7. The hole diameter of the exhaust pipe near the second bend 8 is deformed, resulting in a dent 11 near the bend 7°8 shown in FIG.
．． It will be like 12. This recess in the exhaust pipe increases the exhaust resistance and significantly reduces the exhaust speed, resulting in unstable lamp characteristics.

[Summary of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, the object of the present invention is to
By applying an infrared reflective material to the 2nd bending part, it is possible to prevent dents near the 1st and 2nd bending parts that occur during heating gas discharge, resulting in stable high quality without interfering with the exhaust speed. An object of the present invention is to provide a method for manufacturing an annular fluorescent lamp.

[Embodiments of the invention]

Hereinafter, the method for manufacturing an annular fluorescent lamp according to the present invention will be explained in more detail based on preferred embodiments.

The method for manufacturing an annular fluorescent lamp in this embodiment is as follows:
As shown in the figure, the phosphor 2 is placed on the soda glass of the pulp 1.
The stems 3 and 4 equipped with electrodes at both ends of the pulp coated with
9, 10 and conveyor 51] the first part of the throat trachea 5.
．． Two bent portions 7 and 8 are formed, and after the bent portions are formed, an infrared reflective material, such as a phosphor, is applied to the outer surface near the first and second bent portions 7 and 8. At this time, if the area around the trachea 5 is preheated to 120° C. or lower, the dressing solution will dry quickly after being applied and the flow of the dressing solution can be prevented.

In this way, fluorescent material is applied to the first and second bent portions 7.8 of the exhaust pipe 5, and fc linear pulp is attached at a plurality of equal intervals to the intermittent moving body 53 shown in FIG. The upper molded part 9 is held in a holder (not shown) so that the lower end of the pulp is free. Then, this pulp 1 is transferred by the intermittent rotation of the movable body 53, is gradually heated in the preheating furnace 55 and degassed, and is moved to the N2 light filling position 56.
2' and is then heated in a heating furnace 57 to a softened state that is optimal for bending. Then, the linear pulp is transferred to a bending position 58, after which the impurity gas in the bent pulp is removed, and an annular fluorescent lamp is manufactured through processes such as supplying an inert gas and mercury.

As a result of testing by lighting the completed ring-shaped lamp, a high-quality product with stable luminous flux deterioration was obtained.

[The moving bed of invention]

As explained above, according to the manufacturing method of the mound-shaped firefly lamp of the present invention, by applying an infrared reflective material to the first and second bent portions of the exhaust pipe, the occurrence of dents can be prevented and the exhaust speed can be increased. A stable and high quality annular fluorescent lamp can be produced without any hindrance.

[Brief explanation of drawings]

Fig. 1 is a structural explanatory diagram schematically showing the manufacturing process of an annular fluorescent lamp, Fig. 2 is a cross-sectional view showing a linear lamp, Fig. 3 is a cross-sectional view showing a concave part of the exhaust pipe, and Fig. 4 is a cross-sectional view showing the concave part of the exhaust pipe. FIG. 3 is a front view showing a state in which an infrared reflective material is applied to the linear pulp inside the furnace and the exhaust pipe. 1... Pulp, 5... Exhaust pipe, 7... First bent part, 8... Second bent part, 13... Infrared reflective material. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] In the manufacturing of annular fluorescent lamps, after the glass tube is sealed and before the annular bending process, an infrared reflective material is applied around the bending of the exhaust pipe, and then the straight pulp is bent into an annular shape. A method for manufacturing a characteristic annular fluorescent lamp.