JPS6147053A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To accurately prevent the material for amalgam formation from falling into a luminous tube by providing a rod-shaped body with one or more holes on the side near an exhaust hole formed in the capillary of the luminous tube and the material for amalgam formation on the side far from the exhaust hole, respectively. CONSTITUTION:An exhaust hole 8 is formed on one end side of a capillary 7. A rod-shaped body 9 made of a hollow glass tube and material 10 for amalgam formation made of bismuth, indium, lead, etc. are inserted in this capillary 7 on the side near the exhaust hole 8 and on the side far from it, especially and then the other end of the capillary tube 7 is sealed. The other end of the other capillary is sealed after the exhaust process inside a luminous tube 1 is completed. Consequently, the space enough to facilitate the passing of mercury vapor is formed by a hole formed on the rod-shaped body 9. As a result, the mercury vapor pressure can fully be regulated by an amalgam effect.

Description

[Detailed description of the invention] Industrial applications The present invention relates to fluorescent lamps.

Conventional Structures and Problems Reflecting the trend toward energy conservation, there has been a demand for high-efficiency compact fluorescent lamps that can replace incandescent light bulbs.

The arc tube of such a small fluorescent lamp is made of a straight fluorescent lamp molded into a U shape, or is further bent into a double U shape, and is installed inside an outer tube globe. ing.

In such small fluorescent lamps, the ambient temperature of the arc tube in the globe is not high, and as a result, the mercury vapor pressure in the arc tube becomes higher than the optimum value, reducing the efficiency of generating ultraviolet rays that are effective for light emission, and causing the luminescence of the arc tube to decrease. There was a problem that efficiency decreased.

Therefore, an amalgam method is one method for controlling the mercury vapor pressure to an approximately optimal value even in an atmosphere with a high ambient temperature.

In small amalgam fluorescent lamps, an amalgam-forming substance is inserted into the thin tube of the arc tube, but this amalgam-forming substance is often melted during the arc tube manufacturing process or during lamp lighting. Therefore, the amalgam-forming material may fall into the light tube due to vibration etc. during melting.

If such a fall occurs, it not only takes a long time for the brightness and color tone of the fluorescent lamp to stabilize at the time of startup, but also causes variations in characteristics.

As a conventional measure to prevent the amalgam-forming substance from falling into the arc tube, a cylindrical rod-shaped body is first inserted into the thin tube of the arc tube, and then the amalgam-forming substance is inserted. This amalgam-forming material melts during the manufacturing process of the arc tube or during operation of the finished compact fluorescent lamp. In particular, when the lamp is lit with the cap facing upward, the amalgam-forming substance becomes molten on the end face of the rod-shaped body, so there is a gap difference of more than a certain value between the inner diameter of the capillary of the arc tube and the outer diameter of the rod-shaped body. When this happens, the molten amalgam-forming material becomes so K that it easily falls off. If K, for example, the diameter of the rod-shaped body is increased in order to prevent this fall, the space area for the amalgam-forming substance to react with mercury becomes too small, and the mercury vapor pressure suppressing function becomes insufficient.

purpose of invention The object of the present invention is that the amalgam-forming substance is an arc tube.

To provide a fluorescent lamp that can be reliably prevented from falling into the interior of the room.

Structure of the Invention The present invention provides a rod-shaped body having one or more holes in the capillary of an arc tube on the side near the exhaust hole formed in the capillary, and an amalgam-forming substance on the side far from the exhaust hole. It is characterized by a fluorescent lamp.

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

In FIG. 1, reference numeral 1 denotes an arc tube provided within a globe 2. As shown in FIG. 3 is a case for storing a ballast and a lighting tube (not shown), and 4 is a screw-in cap.

FIG. 2 is an enlarged view of both ends of the arc tube 1. Luminous tube 10
Electrode coils 6 are provided at both ends, and a phosphor coating 11 is formed on the inner surface. The interior of the arc tube 1 is filled with mercury and rare gas.

The electrode coil 5 is held by an internal lead wire 6.

An exhaust hole 8 is formed at one end of the thin tube 7 with an inner diameter D1 of 3.2 mm, and inside this thin tube T, there is an outer diameter on the side closer to the exhaust hole 8, an inner diameter of 2.8 mm, and an inner diameter of 2.8 mm. 2. A rod-shaped body 9 made of a hollow glass tube of 0 mm (Fig. 3a).

b), after an amalgam-forming substance 1o made of bismuth, indium, lead, etc. is inserted into the far side thereof, the other end of the thin tube 7 is sealed. The other end of the other thin tube is sealed after the evacuation process in the arc tube 1 is completed.

As a result of various experiments regarding the dimensions of the thin tube inner diameter D1, the hollow glass tube outer diameter D2, and the inner diameter, the inventor found that D!
It was confirmed that if the following conditions were satisfied: z<0.4mm #Ds<2.4mm, there was almost no falling of the amalgam-forming substance.

It was also confirmed that when the spatial area S required for amalgam formation (see FIG. 4C) is S>10IIIP, amalgam formation necessary for suppressing mercury vapor pressure proceeds rapidly.

Here, space area S=capillary inner area S1-hollow glass tube disconnection area S (see FIG. 4 a-o).

In the above embodiment, an example was explained in which a rod-shaped body having one hole was used, but a single rod-shaped body is shown in FIG. 6a.

In the fluorescent lamp having the above structure using a plurality of holes as shown in FIG. Therefore, the mercury vapor pressure can be sufficiently regulated by the amalgam effect.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention has a simple structure and can be used without impairing the mercury vapor pressure suppressing function of an amalgam-forming substance.
It is possible to provide a fluorescent lamp that can prevent an amalgam-forming substance from falling into an arc tube.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a fluorescent lamp which is an embodiment of the present invention;
Figure 2 is a partially cutaway enlarged sectional view of the arc tube of the same fluorescent lamp.
Figures 3a and 3b are cross-sectional views and partially cutaway views showing an example of a rod-shaped body, and Figure 4a is a diagram illustrating the relationship between the tubular dimensions and internal cross-sectional area and the rod-shaped body dimensions and cross-sectional area. , and FIGS. 6a and 6b are a sectional view and a front view showing other examples of the rod-shaped body. 1... Arc tube, 2... Globe, 3.
...Case, 4°°゛...Base, 5...
・Electrode coil, 6...Internal lead wire, completed...
... Thin tube, 8 ... Exhaust hole, e ... Rod-shaped body, 10 ... Amalgam-forming substance. Name of agent: Patent attorney Toshio Nakao and one other person
・Figure 1° No. 21! I Figure 4 Ib Figure 5

Claims (1)

[Claims] A rod-shaped body having one or more holes is provided in the thin tube of the arc tube on the side closer to the exhaust hole formed in the thin tube, and an amalgam-forming substance is provided on the side farther from the exhaust hole. Fluorescent lamp.