JPH0562652A - Incandescent lamp and its manufacture - Google Patents

Abstract

PURPOSE:To make the surface of the incandescent lamp glass bulb smooth safely and at a low cost, and form a coat on the surface of the smoothed glass bulb by means of a vapour phase method. CONSTITUTION:One end 2 of a glass bulb 1 made of quartz glass is sealed, and the other end 3 is sealed with an electrode portion 5. The surface 6 of the glass bulb 1 is immersed in silica alkoxide solution, and a silica coat 11 is formed on the surface 6 so as to smooth the surface 6. A infrared reflection coat 12 made of titania or silica is formed on the surface 6 of the smoothed glass bulb 1 by means of a deposition method. As no hydrofluoric acid, which involves danger in handling, is used, no safety measures are required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incandescent lamp such as a halogen lamp having an infrared reflecting film formed thereon and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, when a film is formed on a substrate by a vapor phase method such as vapor deposition, the surface of the substrate on which the film is formed is required to have smoothness.

For example, when an infrared reflection film is formed on the surface of a glass bulb constituting an incandescent lamp such as a halogen lamp by a vapor deposition method, most of the glass bulb is made of quartz glass, and therefore the surface of the glass bulb. On the surface, fine particles of silica (SiO ₂ ) with a diameter of 1 μm or less generated from the glass when the electrodes are sealed or the tip of the exhaust pipe is turned off are uneven, so this surface is treated with hydrofluoric acid for smoothing. Then, the infrared reflection film is formed.

[0004]

However, the hydrofluoric acid treatment is highly dangerous because hydrofluoric acid (HF) is used.
In addition, the processing took time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an incandescent light bulb in which the surface of a glass bulb can be safely smoothed to form a film by a vapor phase method and a method for producing the same, in view of the above problems. ..

[0006]

An incandescent lamp according to claim 1, wherein the glass bulb having the electrode portion sealed is coated with a coating by a vapor phase method, the space between the glass bulb and the coating. In addition, a silica film formed by immersing the glass bulb in a silica alkoxide solution is interposed.

According to a second aspect of the present invention, there is provided a method of manufacturing an incandescent light bulb in which a glass bulb having a sealed electrode portion is immersed in a silica alkoxide solution to form a silica film on the glass bulb, and the silica bulb is formed on the silica membrane. And a step of forming a coating film by a vapor phase method.

[0008]

In the incandescent lamp according to the first aspect of the present invention, the surface of the glass bulb having the sealed electrode portion is made smooth by forming a silica film by immersing the glass bulb in a silica alkoxide solution. Therefore, the coating film can be formed on the glass bulb by the vapor phase method.

In the method of manufacturing an incandescent light bulb according to a second aspect of the present invention, when a glass bulb having a sealed electrode portion is dipped in a silica alkoxide solution, a silica film is formed on the surface of the glass bulb to smooth the surface of the glass bulb. To Therefore, a film can be formed on the smoothed glass bulb by a vapor phase method.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the incandescent light bulb of the present invention and a method of manufacturing the same will be described with reference to FIGS.

In FIG. 1, reference numeral 1 is a glass bulb made of, for example, quartz glass. The glass bulb 1 has one end 2 closed and the other end 3 sealed with an electrode portion 5 having a filament 4. An exhaust pipe (not shown) is provided in the electrode portion 5. The exhaust pipe is used to exhaust the inside of the glass bulb 1 and to seal a predetermined rare gas, and then the exhaust pipe is chipped off. .. At this time, on the surface 6 of the glass bulb 1, as shown in FIG. 2, fine particles of silica having a diameter of 1 μm or less generated from the glass bulb 1 at the time of sealing the electrode portion 5 or tipping off the exhaust pipe. Since powder 7 adheres, the surface 6 has an average of 0.3.
It has a roughness of 7 μm.

Next, the surface 6 of the glass bulb 1 is treated with a silica alkoxide solution (NST51 manufactured by Nippon Soda Co., Ltd.).
Immerse in 0). At this time, silica contained in the silica alkoxide solution is coated on the surface 6 so as to smooth the roughness of the surface 6. Next, when the coated silica is fired, a silica film 11 having a film thickness of 0.5 to 0.6 μm is formed on the surface 6 of the glass bulb 1. Then, the surface 6 of the glass bulb 1 is formed by the silica film 11.
The average roughness of the glass bulb was reduced to 0.15 μm and the glass bulb 1
Surface 6 becomes smooth.

Next, on the silica film 11 of the glass bulb 1, the interference films 12a, 12b, 12 of titania (TiO ₂ ) and silica are deposited by vapor deposition as a vapor deposition method.
For example, 17 layers of c, ... Are laminated in this order to form the infrared reflection film 12 as a film.

Then, a base 13 is attached to the other end 3 of the glass bulb 1 to complete a halogen lamp 14 as an incandescent lamp having an infrared reflection film 12.

As described above, when the electrode part 5 is sealed or the exhaust pipe is turned off, the irregularities caused by the fine silica powder 7 adhered to the surface of the glass bulb 1 from the glass bulb 1 are removed. The silica film 11 is formed while being filled with the silica contained in the glass bulb 1.
The surface 6 can be smoothed.

The infrared reflection film 12 formed on the silica film 11 by the vapor deposition method is formed by smoothing the surface 6 of the glass bulb 1 by hydrofluoric acid treatment.
Compared with 12, the visible light transmittance is improved from about 80% to 92%, so that a good infrared reflective film having excellent visible light transmittance.
Twelve can be formed.

Further, since hydrofluoric acid, which is dangerous to handle, is not used, it is not necessary to take safety measures for the equipment and facilities required for smoothing the surface 6 of the glass bulb 1.
The surface 6 of the glass bulb 1 can be made smooth at low cost.

Although the halogen lamp 14 is used as the incandescent lamp in the above embodiment, the present invention is not limited to this.
It can be applied to an appropriate incandescent lamp that forms a film on the surface 6 of the glass bulb 1 by the vapor phase method, and has the same effect as the above-mentioned embodiment.

In the above embodiment, the infrared reflecting film 12 formed on the surface 6 of the glass bulb 1 by the vapor deposition method is used as the coating, but the present invention is not limited to this. It can also be applied to an appropriate incandescent lamp that forms a film by the phase method, and has the same effect as in the above-mentioned embodiment.

[0020]

According to the incandescent lamp according to the first aspect of the invention, the surface of the glass bulb in which the electrode portion is sealed is made smooth by immersing it in a silica alkoxide solution to form a silica film. A coating can be formed on the surface of this glass bulb by a vapor phase method. In addition, since hydrofluoric acid, which is dangerous to handle, is not used to smooth the surface of the glass bulb, there is no need to take safety measures on the equipment and facilities required to smooth the surface of the glass bulb, which is safe and inexpensive. In addition, the surface of the glass bulb can be made smooth.

According to the method of manufacturing an incandescent lamp according to the second aspect, the glass bulb with the electrode portion sealed is dipped in the silica alkoxide solution to form a silica film on the surface of the glass bulb. The surface of the glass bulb can be made smooth. Therefore, a film can be formed on the smoothed surface of the glass bulb by the vapor phase method. Also, in order to smooth the surface of the glass bulb,
Since hydrofluoric acid, which is dangerous to handle, is not used, it is not necessary to take safety measures on the equipment and facilities required to smooth the surface of the glass bulb, and the surface of the glass bulb can be made smooth safely and inexpensively. ..

[Brief description of drawings]

FIG. 1 is an overall view of a halogen lamp showing an embodiment of the present invention.

FIG. 2 is a sectional view of the above glass bulb.

[Explanation of symbols]

 1 Glass bulb 5 Electrode part 6 Surface 11 Silica film 12 Infrared reflective film as a film 14 Halogen lamp as an incandescent lamp

Claims (2)

[Claims] 1. An incandescent lamp in which a coating is formed on a glass bulb having a sealed electrode part by a vapor phase method, wherein the glass bulb is immersed in a silica alkoxide solution between the glass bulb and the coating. An incandescent light bulb, characterized in that a silica film formed by is interposed. 2. A step of forming a silica film on the glass bulb by immersing a glass bulb whose electrode part is sealed in a silica alkoxide solution, and a step of forming a coating on the silica membrane by a vapor phase method. A method of manufacturing an incandescent light bulb, comprising: