JPS6124142A - Method of producing incandescent bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Different Fields of Application The present invention relates to a method of manufacturing an incandescent light bulb.0 Structure of a conventional example and its problems Conventionally, the surface of a bulb made of quartz glass VcT1021
Halogen light bulbs, such as S1o2, are known in which a multilayer infrared reflective film that transmits visible light and reflects infrared light is formed.

This infrared reflective film is manufactured by providing a filament structure having a conductor, etc. connected to the filament inside the bulb, sealing the end of the bulb, cleaning the bulb surface, and coating.
It is formed using a method of repeating baking nine times.

The infrared reflecting effect of the infrared reflecting film is determined by the thickness of the film and the baking temperature φ baking time. The important points in manufacturing for forming an infrared reflective film on the surface of a bulb are the baking temperature and baking time. Suitable baking temperature is 600 to 800'' and C1 baking time is 2 to 3 hours.

Therefore, an infrared reflective film is formed on the bulb surface under the baking temperature and baking time conditions described above, but in this case, the following problems occur.

In other words, the outer conductor made of molybdenum led out from the sealing part of the valve is exposed to high temperatures during baking and oxidizes, which not only reduces the strength of the outer conductor itself but also increases the coefficient of expansion due to oxidation. The distortion of the quartz glass in the bonded area increases, causing damage to the sealed area.

Therefore, in order to solve this problem, an infrared reflective film is formed on the bulb surface while the outer conductor is completely covered with a heat-resistant material that is folded airtight to prevent it from coming into contact with the air. However, since it is difficult and expensive to find a material that is airtight and heat resistant,
The manufacturing conditions are such that the baking temperature is low and the baking time is short, thereby preventing damage to the sealed portion. However, since the infrared reflection effect is small and the adhesion strength of the film is also weak, there is a drawback that the light reflection film tends to peel off from the bulb surface during lighting.

On the other hand, it is also possible to seal a quartz glass bulb with an infrared reflective film formed on its surface in advance.In this case, when forming an infrared reflective film on the bulb surface, there is no conductor at all. , high baking temperature of the membrane,
It is believed that the conditions of a long baking time and a thick film can be satisfied, and therefore a film of good quality, that is, a film with high infrared reflection efficiency and high adhesion strength, can be obtained.

However, when an adhesion process is actually performed using such a bulb with an infrared reflective film, the following problem occurs. That is, when quartz glass is heated and melted to seal it, a part of the S102 component evaporates, and this evaporated material adheres to the bulb surface outside the sealing part, causing cloudy contamination. In addition, this cloudy contaminant is baked onto the surface of the bulb at a temperature higher than the melting temperature of quartz glass (1,700 to 1,900°C), which has the negative effect of reducing not only the appearance but also the amount of visible light. However, it can be removed by heating the lupus to about 1000"C and evaporating it (using Nocuna etc.). However, when heating, the infrared reflective film is also removed. The disadvantage is that it evaporates.

OBJECTS OF THE INVENTION The present invention provides a method for manufacturing an incandescent light bulb that can easily obtain a high-quality infrared reflective film by using a bulb on which an infrared reflective film is previously formed.

Effects of the Invention The present invention is made of quartz glass on which an infrared reflective film has been formed on the surface. DESCRIPTION OF EMBODIMENT 0 EMBODIMENT OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, both ends of a filament 1 are connected to two long and short conductors 2, and these conductors 2 are connected to an outer conductor 4 made of molybdenum via a metal foil 3 to form a filament structure. ing. First, the outer conductor 4 is erected in the mounting bin 6. Next, the filament structure is made of quartz glass with an outer diameter of 1Q and 5'1lll, on which an infrared reflective film 6 of TiO2, 51O2, etc. has been formed in multiple layers on the surface. In addition, by covering the bulb 7 with a cap-shaped shield 8 made of a heat-resistant material such as ceramic or quartz and having an inner diameter of 11.0 mm, the infrared reflective film 6 is covered with the shield 8.゛- In the above state, the end of the bulb 7 is heated and melted with a burner 9 of a mixed gas flame of proton and oxygen, and then binched to form a sealed part 1o (Fig. 2). , conductor 2, etc. are exposed to high temperatures and will oxidize and become defective in air. Therefore, in order to prevent oxidation, inert gas 11 such as argon or nitrogen is introduced from the top of valve 7 into its interior. Note that when sealing the end of the valve 7, the processing temperature is as high as 17oO to 1900°C, so the shielding body 8 made of ceramic, which is a heat-resistant polar material, is used. Even if the shield is used, if the shield is close to the sealing part 1o, there is a risk that the end of the shield 8 will melt and be fused to the nozzle 7. Therefore, in order to prevent this, the shield The length of the body 8 is set to the minimum length that covers the infrared reflective film 6. In this example, the length from the end of the sealing part of the noclebe 7 to the edge of the shielding body 8 is 6.
According to this manufacturing method, cloudy contamination due to evaporated matter of quartz glass generated during sealing occurs not on the infrared reflective film e on the surface of the nozzle 7, but on the outer surface of the shielding body 8. Note that if there is a gap of about two paths between the valve 7 and the shield 8,
Since cloudy contamination will also occur on the infrared reflective film 6, the gap is preferably set to about 0.5 to 1 inch in consideration of workability.

Effects of the Invention As explained above, according to the present invention, there is no risk of damage to the sealing part caused by oxidation of the external conductor, and there is no need to increase the baking temperature of the infrared reflective film and the phosphorescence time. To provide a method for manufacturing an incandescent light bulb, which can easily be used for a long time, has an excellent infrared reflection effect, and has a high-quality infrared reflection film that does not peel off on the surface of a bulb made of quartz glass. It is something that can be done.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams for explaining a method of manufacturing an incandescent light bulb, which is an embodiment of the present invention. 1...Filament, 2...Conductor, 6
...Infrared reflective film, 7...Bulb, 8
...shielding body.

Claims (1)

[Claims] An incandescent lamp characterized in that a filament structure is provided in a bulb made of quartz glass on which an infrared reflective film has been formed on the surface in advance, and the ends of the bulb are heat-sealed with the infrared reflective film covered with a shielding body. How to make light bulbs.