JPH0224958A - Manufacture of halogen electric lamp - Google Patents

Abstract

PURPOSE:To form a metal oxide film laminated with a required titanium film and a silicone film in turn on a glass bulb by repeating the processes to immerse it in the required solution then lift it at a constant speed and dry and bake it. CONSTITUTION:After a glass bulb provided with a filament inside is immersed in a solution containing a metal oxide, processes are repeated to lift it from the solution at a constant speed and dry and bake it, a metal oxide film laminated with a titanium dioxide film and a silicone dioxide film in turn cutting off only the blue light and having high heat resistance is formed on the outer face of the glass bulb, a halogen electric lamp bulb permeated by the yellow light is economically manufactured without using the deposition method or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing halogen light bulbs used in automobiles and the like.

BACKGROUND OF THE INVENTION In recent years, as automobiles have become increasingly electronic, their power consumption has been increasing. However, since battery capacity is limited, there is an urgent need to conserve power in each component. Therefore,
More efficient halogen light bulbs have come to be used as light sources in headlights and other devices.

There are various light sources for automobiles, and among them there is a light source that emits yellow light, which is used on foggy days or at dusk.

Conventionally, when a halogen light bulb is used as this light source, a glass bulb 1 is covered with a colored glass 3 that transmits only yellow light, as shown in FIG. In FIG. 5, 4 is a filament, 5 is a reflective mirror, 6 is an internal lead wire, 7 is a light-shielding film, 8 is a cap, and 9 is a hook for attaching colored glass.

Problem to be Solved by the Invention In order to make white light yellow, it is sufficient to block blue light, but colored glass also absorbs some of the other light, so the brightness of the halogen light bulb is considerably reduced. (Curve in Figure 3)
).

The temperature of the glass bulb of a halogen bulb is very high, 600℃.
The temperature can reach ~700℃. On the other hand, the heat resistance temperature of colored glass is 30
Because the temperature is only about 0°C, the colored glass must be placed quite far from the halogen bulb, resulting in an extremely large lamp volume. A special fixing structure is required (see Figure 5).

Colored glass is made by mixing various substances in order to transmit only yellow light, one of which is cadmium. However, cadmium is highly toxic and poses pollution problems during the manufacturing process and during the disposal of used lamps.

If a metal oxide film consisting of multiple layers that blocks only blue light is formed on the outer surface of a glass bulb by vapor deposition, it is possible to obtain a halogen bulb that emits yellow light and solves the above problems. It is extremely difficult to form a metal oxide film with a constant thickness on the outer surface of a glass bulb having a predetermined shape. Furthermore, the manufacturing cost is high, making it difficult to put it into practical use.

The present invention provides a method for manufacturing a halogen light bulb that can easily produce a compact halogen light bulb that emits yellow light and is inexpensive.

Means for Solving the Problems The method for manufacturing a halogen light bulb of the present invention includes immersing a glass bulb with a filament inside in a solution containing a metal compound, and then pulling the glass bulb out of the solution at a constant speed and drying it.・By repeating the firing process,
A metal oxide film consisting of alternately laminated titanium dioxide films and silicon dioxide films that block only blue light is formed on the outer surface of the glass bulb.

When a working metal compound is thermally decomposed, a film of metal oxide is precipitated,
By repeating this process, multiple layers of metal oxide films are formed on the outer surface of the glass bulb. When different types of films are alternately stacked, light is reflected at each boundary surface, and the light interferes with each other, increasing the reflectance of light of a specific wavelength. By controlling the film thickness, only blue light can be reflected, resulting in the transmitted light being yellow.

EXAMPLE FIG. 1 shows a halogen light bulb used in an automobile headlight obtained by the method of the present invention. In Fig. 1, inside the glass bulb 1 made of quartz, there are two
Two filaments 4 are provided. A reflecting mirror 5 is provided on the upper filament 4 to prevent light from hitting the oncoming vehicle. A light shielding film 7 is applied to the top of the glass bulb 1 to prevent glare.

On the outer surface of the glass bulb 1, a metal oxide film 2 consisting of a plurality of layers that blocks only blue light and transmits yellow light is formed by a method described later. This metal oxide film is
It is made of an alternating layer of titanium dioxide (hereinafter referred to as T i 02) film 10 and silicon dioxide (hereinafter referred to as 5i (h) film 11), and is applied to the glass bulb 1 after halogen gas has been filled into the glass bulb 1. After coating, a light shielding film 7 is formed on the glass bulb 1, and a cap 8 is attached to complete the process.

Next, a method for forming the metal oxide film 2 will be explained using FIG. 2.

As shown in Figure 2, tetrabutyl titanate [Ti(
A glass bulb 1 is immersed in a solution 12 in which C4H9)4] is dissolved in ethanol, and then pulled up at a constant speed. After drying this at a temperature of 200°C, it is fired at a temperature of 550°C for 10 minutes. In this way, the T i 02 film 10 is formed (see FIG. 1).

After cooling, the above glass bulb is immersed in a solution in which ethyl silicate [5i(OC2Hs)4] is dissolved in ethanol and further diluted hydrochloric acid is added, and pulled up at a constant speed. After that, it was dried in the same manner at a temperature of 200°C, and further dried at a temperature of 550°C.
C. to form a 5i(h film 11) on the Ti2 film 10 (see FIG. 1).

In addition, in FIG. 2, 13 indicates a sealing part, and 14 indicates an external lead wire.

The above steps are repeated to form a metal oxide film 2 consisting of nine layers on the glass bulb 1. The manufacturing conditions for each layer are shown in the table below.

The spectral transmittance curve of this metal oxide layer is shown as curve I in FIG. Moreover, FIG. 4 is a spectral radiation curve (curve ■) of a halogen light bulb obtained by the method of the present invention. Curve 2 in the figure shows a spectral radiation curve diagram when such a metal oxide layer is not provided. As can be seen from the figure, the halogen bulb according to the present invention has a lower transmittance for light having a wavelength of 500 nm or less than the conventional bulb due to the light interference effect. As a result,
The short-wavelength light from halogen bulbs, that is, the blue light, is cut out and becomes yellow light.

As described in detail, according to the method of the invention, T i 0
Since the 2 film and 5i02 film are heat resistant, a layer that blocks only blue light can be placed directly on the outer surface of the glass bulb, making it possible to make the halogen light bulb more compact. There is no need to adopt a special structure.Furthermore, the transmittance of such a metal oxide film is higher than that of conventional colored glass, increasing the luminous flux of a halogen bulb by as much as 20%.Furthermore, the materials used are T i02 and 5i(h), so there is no risk of pollution.Moreover, the method of the present invention can easily form a metal oxide film on the outer surface of a glass bulb using a simple device, and is inexpensive. Also, the cost is about 115 compared to the vapor deposition method.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an example of a halogen light bulb obtained by the method of the present invention, FIG. 2 is a diagram for explaining the invention in detail, FIG. 3 is a spectral transmittance curve diagram, and FIG. FIG. 4 is a spectral radiation curve diagram of a halogen light bulb, and FIG. 5 is a partially cutaway front view of a conventional halogen light bulb with colored glass. 1...Glass bulb, 2...Metal oxide film, 4...Filament, 10...
Titanium dioxide film, 11...Silicon dioxide film. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 3 missing f (n bacteria)! Ga fact 324 = Yo;, Q (○ Suαtsu

Claims (1)

[Claims] Titanium dioxide that blocks only blue light is produced by repeating the process of immersing a glass bulb with a filament inside in a solution containing a metal compound, then pulling the glass bulb out of the solution at a constant rate, drying, and firing it. A method for manufacturing a halogen light bulb, comprising forming a metal oxide film on the outer surface of the glass bulb, which is a metal oxide film in which a film and a silicon dioxide film are alternately laminated.