JPH03295155A - Incandescent lamp and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain an incandescent lamp which has a strong sticking force of a film to a glass bulb and shows a faint soft green color at the time of lighting by forming a titanium oxide film on the inner face of the glass bulb, and electrostatically coating the silica fine powder containing titanium yellow and ultramarine blue on the film. CONSTITUTION:A titanium oxide film 3 is formed by wet coating on the inner face of a G70 glass bulb 2 made of soft glass and having a filament 1 inside an incandescent lamp, and a silica film 4 containing titanium yellow and ultramarine blue 2-9wt.% is electrostatically coated on the titanium oxide film 3. The light emitted from the filament 1 of the incandescent lamp is made the green diffused light by the silica film 4 containing titanium yellow and ultramarine blue and is made the faint soft green light by being further diffused by the titanium oxide film 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an incandescent light bulb that exhibits a light green color when lit, and a method for manufacturing the same. Although there are known bulbs that have been corroded by a hydrogen hydride mixture solution and ones that have been electrostatically coated with a thick layer of fine silica powder containing a green pigment on the inner surface of transparent glass bulbs, there are problems that the invention aims to solve. Since a hydrogen fluoride mixed solution is used, there are safety issues and special treatment equipment is required for waste liquid treatment. It is necessary to thicken the electrostatically coated film so that it cannot be seen through, but when this film is made thicker, the adhesion of the interlayer to the glass bulb decreases, and for this reason, when filling gas in the manufacture of light bulbs,
Or shock and vibration during transportation or use may cause the film to shift or become damaged, leading to a deterioration in appearance quality.Additionally, part of the electrostatic coating film that has fallen off from the inner surface of the glass bulb may adhere to the filament, shortening its lifespan. In addition, none of the above methods could produce an incandescent light bulb that exhibits a pale, soft green color.The present invention was made in view of these circumstances, and it involves applying a film to the inner surface of the glass bulb. The present invention provides an incandescent light bulb that can adhere strongly and exhibits a pale, soft green color when lit. Means for Solving the Problems The incandescent light bulb wire of the present invention includes a titanium oxide film on the inner surface of a glass bulb that has a filament inside. and a silica film containing 2% to 9% by weight of titanium yellow and ultramarine blue is formed on the titanium oxide film. Top: Wet coating titanium oxide on the inner surface of a glass bulb that has a filament inside to form a titanium oxide film, and apply silica fine powder containing 2% to 9% by weight of titanium yellow and ultramarine on the titanium oxide film. A silica film is formed by electrostatic coating.The titanium oxide film formed on the inner surface of the glass bulb has strong adhesion, and the thickness of the silica film can be thin. Example 1 is a partially cutaway front view of a pale green incandescent light bulb which is an example of the present invention. Incandescent light bulb & friend G70 made of soft glass with filament 1 inside
A titanium oxide film 3 is formed on the inner surface of the glass bulb 2 by wet coating.A silica film 4 containing 2% to 9% by weight of titanium yellow and ultramarine is formed on this titanium oxide film by electrostatic coating. In Figure 1, 5 indicates the mount, and 6 indicates the lead-in line 7, respectively.

In an incandescent light bulb having such a configuration, the light emitted from the filament 1 becomes a green diffused light due to the silica film 4 containing titanium yellow and ultramarine blue, and is further diffused by the titanium oxide film 3 to produce a pale and soft green light. Figure 2A~ shows the light it emits and the method for manufacturing such an incandescent light bulb.
This will be explained using FIG. 2C, but in FIG. 2A, the glass bulb 2 is supported by the holder 8 and held down by the presser 9 so that the opening faces downward.
A nozzle 10 is provided inside the glass bulb 2.Nozzle 1
One end of the pipe 11 is connected to the pipe 11, and the other end is placed in the titanium oxide suspension 13 stored in the container 12. 0.8 weight list 94% by weight of butyl acetate was stirred with a stirrer at a rotation speed of 1500 rpm for 20 minutes, and the specific gravity was controlled to be 0.93. Even if the pipe 14 is provided, in FIG. Figure C shows the electrostatic coating of fine silica powder containing titanium yellow and ultramarine on the titanium oxide film 3 formed on the inner surface of the glass bulb 2. In Figure C, the opening of the glass bulb 2 is facing downward. It is supported by a rotatable holder 18 so that a coating nozzle 19 is provided inside it.The titanium yellow has a particle size of 0.
．． Ultrahigh-speed jet crusher is used to reduce the particle size of 4 to 1.2μ to 0.2 to 0.6μ. Similarly, particles with a particle size of 0. 3-0. Each powder is ground to 9μ, and mixed with 2 to 9% by weight in fine silica powder.
45% wet silica containing 6% and dry silica containing less than 2% moisture.
A burner 20 is installed near the glass bulb 2, and a high pressure of 22 to 25 KV is applied to it. As shown in FIG. 2A, compressed air is introduced into the container 12 from the pipe 14. and titanium oxide suspension 1
3 is injected from the nozzle 10 through the pipe 11, hits the top inner surface of the glass bulb 2, and flows down along the flow shown by the arrow, so that titanium oxide is applied to the inner surface of the glass bulb 2. As shown in Figure B, hot air is flowed into the inside of the glass bulb 2 from the nozzle 17 placed below it.The hot air is flowed slightly at first, and then strengthened over time to completely remove the titanium oxide from the neck of the glass bulb 2. However, if the glass bulb with the titanium oxide body that has been sufficiently dried is fired at 600℃ for 90 seconds, the strength of the glass bulb will decrease significantly.
In FIG. 2C, the holder 18 is rotated to rotate the glass bulb 2, and the burner 20 is used to rotate the glass bulb 2.
The glass bulb 2 is heated to 200°C to 250°C, and the glass bulb 2 is positively charged by the flame of the burner 19. Under such conditions, the negatively charged silica fine powder containing titanium yellow and ultramarine is passed through the coating nozzle 19 using compressed air. The titanium oxide film formed on the positively charged inner surface of the glass bulb 2 is sprayed into the glass bulb 2 and coated with a silica film containing titanium yellow and ultramarine blue. 20～
A nozzle with a hole diameter of 3+am is inserted into the glass bulb 2, which has a two-layer film of titanium oxide film and silica film formed on the inner surface in this way. The adhesion force of the film was examined by inserting it in the center position and blowing air horizontally from the hole. It has a minimum adhesion force of 1.5 to 2 times compared to
Figure 3 shows an example of the spectral distribution of a 100 V 60 W incandescent light bulb according to an embodiment of the present invention. The spectral distribution of a 100 V 60 W incandescent light bulb (comparative example) electrostatically coated onto titanium oxide using the above method is shown.

As can be seen from the comparison between Fig. 3 and Fig. 4, the incandescent lamp according to the embodiment of the present invention has less relative energy in the range of 560 to 700 nm than the incandescent lamp according to the comparative example, and has a color temperature of about 200 nm.
According to experiments, it was confirmed that when the content of titanium yellow and ultramarine in the silica film is less than 2% by weight, the green color is too pale, while when it exceeds 9% by weight. It was confirmed that the color did not become pale.
Therefore, the content of titanium yellow and ultramarine in the silica film is preferably in the range of 2 to 9% by weight.As described in detail of the invention, the present invention forms a titanium oxide film on the inner surface of a glass bulb, and By electrostatically coating fine silica powder containing titanium yellow and ultramarine on the film, the film has strong adhesion to the glass bulb, making it possible to provide an incandescent light bulb that exhibits a pale, soft green color when lit.

[Brief explanation of the drawing]

FIG. 1 shows a partially cut-away front view of an incandescent light bulb according to an embodiment of the present invention. FIG. Figure 4 is a diagram showing an example of the spectral distribution of an incandescent light bulb as a comparative example.

Claims (2)

[Claims] (1) A titanium oxide film was formed on the inner surface of a glass bulb having a filament inside, and an electrostatic coating film of silica containing 2% to 9% by weight of titanium yellow and ultramarine was formed on the titanium oxide film. An incandescent light bulb characterized by: (2) Wet-coat titanium oxide on the inner surface of a glass bulb that has a filament inside, and then bake it to form a titanium oxide film, and apply 2% by weight on the titanium oxide film.
A method for producing an incandescent light bulb, comprising forming a silica film by electrostatically coating a fine silica powder containing ~9% by weight of titanium yellow and ultramarine blue.