JPS5940455A - Production method of fluorescent lamp inner tube - Google Patents

Abstract

PURPOSE:To prevent discoloration of an inner tube and improve the light flux deterioration by bending the glass containing either a lead component or an alkaline component to form an inner tube then immersing the innner tube in strong acid to remove the lead component and alkaline component in the surface layer. CONSTITUTION:Multiple bent inner tubes 3 are constituted in series through a spacer 4 in the airtight space formed with an outer tube 1 and a stem, one portion of the liaison section of the inner tubes 3 is opened to the space 2, electrodes 5 are provided at both ends of the inner tubes 3 constituted in series, and the inner tubes 3 are made a discharge path 6. Phosphor 7 is coated on the inner wall of the inner tubes 3, a proper amount of mercury and rare gas is sealed in the space 2, and both ends of the inner tubes 3 are stuck to the spacer 4 with an inorganic adhesive agent 8. Lead glass is bent and machined to form the inner tube 3, which is then subject to surface treatment with the chemical reacting to the lead component or alkaline component, e.g., strong acid such as H2SO4. Accordingly, layers A, A' with no lead component or alkaline component existing are formed on the glass surface. Thereby, no discoloration occurs and the light flux deterioration can be extremely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an inner tube used in a compact fluorescent ring in which an inner tube is housed in an airtight space formed by an outer tube and a sudem, and the inner tube serves as a discharge path. .

Figure 1 is a partially cutaway front view showing a conventional fluorescent rung of this type. The inner tubes 48 are arranged in series via the spacer 4, and at least one of the 5 communicating portions of the inner tubes 3 is open to the airtight space 62, and at both ends of the inner 7 inner tubes 2 arranged in series. An electrode 5 is provided, and the inner tube 2 is used as a discharge path 68, and the inner wall of the inner tube 8 is coated with a phosphor 97. Still, an appropriate amount of mercury vapor and energy is sealed in the airtight spaces 2 and 10 and the discharge path 6, and the inner tube 80 is bonded to the surface 12-4 with an inorganic adhesive 8 at both ends. . Reference numeral 9 indicates a lighting device section, and reference numeral 11 indicates a screw cap.

14 Conventionally, lead glass, which is suitable for bending process, has often been used for the inner tube 8 used in such fluorescent rungs. If lead glass is used in this way, run 17
As the lighting time elapses, lead oxide (pbo), which is a component of the glass 18 that makes up the inner tube 8, changes
An organic gas such as 12O hydrogen oxide (CO) generated from the manufactured spacer 4 and the inorganic adhesive 8 causes a reaction of pbo and organic gas - pb (precipitation) to occur, and the inner tube 8
The exterior walls of the building turn brown.

This brown discoloration of the inner tube 8 was a major cause of luminous flux deterioration.

In addition, even if alkaline components (e.g. cold) are included as glass components, due to the substitution reaction with mercury during discharge,
The inner wall of the inner tube 8 was discolored to black, which also caused deterioration of the luminous flux.

Therefore, in order to improve luminous flux deterioration due to browning or blackening of the inner tube, it is sufficient to use glass that does not contain lead or alkali components for the inner tube, but as is well known, glass that does not contain lead has the disadvantage of poor bendability.

The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to provide a fluorescent lamp in which luminous flux deterioration due to discoloration of the inner tube is improved and the inner tube can be easily bent.

The present invention will be explained below. As the material for the inner tube according to the present invention, lead glass, which can be easily bent, is used.

First, the glass is bent, and then the surface is treated with a chemical (for example, a strong acid such as H2SO4) that reacts with lead or alkali to remove the lead or alkali on the glass surface jθ. Through such treatment, as shown in FIG. 2, B A and A' (without lead or alkali) are formed on the surfaces of the two glasses. This A, A
The thickness of ' can be controlled by the type of chemical, concentration, processing time, etc.

In the present invention, as described above, the inner tube is bent using a force glass containing at least one of lead and alkali. Since there is no lead or alkali content in the surface layer of the inner tube, which causes discoloration, discoloration does not occur as in the case of conventional products, and the deterioration of luminous flux caused by this has been significantly improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a fluorescent rung, and FIG. 2 is an enlarged sectional view of an inner tube according to the present invention.

Claims (1)

[Claims] ti) A plurality of bent inner tubes are arranged in six rows via spacers in the airtight space formed by the outer tube and the Nudem, and at least one of the communication parts of the inner tubes is connected to the airtight space. In the fluorescent lamp, the inner tubes arranged in series are provided with electrodes at both ends, and the inner tubes serve as a discharge path, and the inner tubes are made of glass containing at least one of lead and alkali. 1. A method for manufacturing an inner tube of a fluorescent lamp, which comprises bending the inner tube, and then immersing the inner tube in a strong acid to remove at least one of lead and alkali from the surface layer.