JPS5947428B2 - Incandescent light bulb with no heat rays and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incandescent light bulb, particularly an all-glass sealed beam light bulb (hereinafter simply referred to as a sealed beam light bulb), which is designed to prevent the projection of infrared light as much as possible. A metal oxide film consisting of tin oxide (5n02) and antimoy oxide (5b203) is applied to a predetermined portion of a general incandescent light bulb using the ion brating method using high frequency excitation.
A high-frequency coil is installed in the vacuum device, and after evacuation, atmospheric gas is introduced, the atmospheric gas is activated by high-frequency excitation, and the evaporation source is heated in a state with increased anti-reactivity, promoting reaction with evaporated particles. This invention relates to a method characterized in that the evaporated particles are deposited on the surface to which they are deposited, and the purpose thereof is to eliminate any damage during the manufacturing process of each of the above-mentioned light bulbs and to extend their lifespan. Not only does it last for a long time, but its value also lies in the fact that it can be made at a low price.

Usually, in order to prevent the projection of infrared light, a method is used to form a film made of metal oxide by vapor deposition or spraying on the lens of a sealed beam light bulb or on the outer surface of a predetermined part of a general incandescent light bulb. It is being taught.

Looking at the specific method, if the exhaust pipe is treated with an oxide film before being sealed, the particles that are the components of the film will enter from the outside of the exhaust pipe and adhere to the inside of the light bulb, causing the lens of the light bulb to be coated. Not only does this cause the same problems as applying the coating to a predetermined area, it also stains the reflective surface of sealed beam light bulbs, and furthermore, it has the disadvantage of requiring major modifications to the existing light bulb manufacturing line. .

However, when performing oxide film treatment after sealing the exhaust pipe, that is, after completing the light bulb, it is conceivable to use the commonly used spray method or vapor deposition method as a means for forming the film.

However, when these methods are used, in a sealed beam light bulb, the formed reflector has to undergo the following steps: exhaust pipe attachment, aluminum vacuum deposition, filament support deposition, and filament attachment. Welding with the lens, then sealing the exhaust pipe, and in the case of general incandescent light bulbs, welding the bulb and stem part, then sealing the exhaust pipe, etc.After each process, the oxide film is treated. At this time, in order to form a metal oxide film that cuts heat rays, the spray method requires heating to 500°C or higher, and the vapor deposition method requires heating to 300°C or higher.
A heating process of several hours at temperatures above ℃ is required.

Therefore, mechanical strength can be maintained due to the increase in the internal pressure of the bulb due to this heating, especially in general incandescent bulbs.
Since soft glass is used, it melts and deforms, making both bulbs virtually impossible to manufacture.

By the way, when considering metal oxide films from the viewpoint of materials, for example, indium oxide (In2O3), tin decaoxide (5n02
) can be easily formed using the vapor deposition method without heating the substrate, so it is considered to be a good film, but as the characteristics are shown in Figure 1, °C (locally highest temperature when turned on)
If it exceeds 0.7 μm, the heat ray cutting rate decreases and a large amount of long wavelengths exceeding 0.7 μm are transmitted, which is a serious drawback.

The present invention aims to eliminate the various disadvantages of paper as much as possible, and below, with reference to FIG. 2, one embodiment thereof will be described.
The specific configuration will be described in detail along with the embodiment.

A powder made by adding 5 parts of antimony oxide to tin oxide was pressure-molded, and this was placed as an evaporation sample on the berth of a magnetic deflection type sweep electron gun with a cathode potential of -6 KV for evaporation. A 13.56 (ME(z), ■ [kW] RF power source was connected through a matching box, the substrate was made of soda glass, and a light bulb with a sealed exhaust pipe was placed 350 m above the evaporation source. The vacuum chamber was evacuated at 2 x 105 Torr without any particular heating of the substrate, and then 99.9911
02 gas was introduced and the temperature inside the tank was 5 x 10-4 Torr.
The DC acceleration potential at the board is set to OV. In this state, RF power of 500 W is applied. After generating high-density plasma around the RF coil, the evaporation material is evaporated with an electron gun. The evaporation material is the oxygen plasma. As it passes through, it is sufficiently excited and reacts with oxygen to deposit a transparent film of tin oxide and antimony oxide, and the deposition rate is controlled at 'io, 08 μm/-.
A transparent film with a film thickness of 0.4 μm was obtained.

Also, under the same conditions as above, only the deposition rate was increased to 0.2 μm.
/yytin and substrate heating temperature: 250
℃, RF electric crab 800 W, and DC voltage: 500 μm, a transparent film having a thickness of 0.4 μm as described above was obtained.

Figure 2 shows the properties of tin oxide (Sn203) with 5% antimony oxide (Sb203) used at temperatures above 300°C, as seen in the coating material shown in Figure 1 above. Changes due to temperature rise (characteristic deterioration)
is not observed at all.

Incidentally, since the practical temperature of an incandescent light bulb having this type of heat ray cutting characteristic is approximately 300° C. or lower, it is sufficient to confirm the characteristics at 300° C.

That is, to explain the characteristics shown in FIG. 2 in more detail, the characteristics shown in FIG. 2 can be obtained by setting the deposition rate, substrate heating temperature, and RF power, but even without substrate heating, the characteristics As can be seen, the wavelength at which the average transmittance of visible light is 90% and the transmittance of heat rays is 1/2 of the average transmittance of visible light is 1.4 μm, indicating sufficient heat ray cutting characteristics. I understand.

In this way, it is possible to form a metal oxide film that has the property of producing hot rays at low temperatures, so it can be used without increasing the internal pressure inside the bulb after the exhaust pipe is sealed, that is, after the bulb is completed. Characteristics can be obtained.

Next, in the case of characteristic C, when only the deposition rate is made twice or more compared to that of characteristic a, the transmittance of visible light decreases and heat rays are somewhat easier to emit, but it takes a shorter time. It has the advantage of being able to form a heat ray cutting film.

Furthermore, the characteristics include substrate heating temperature, RF power, DC
By changing the voltage and deposition rate, the characteristic a
and C.

In addition, the properties shown in Figure 2 were tested at 300°C and 600°C.
When heated for 240 hours, no change in the heat ray transmission characteristics was observed due to the temperature rise as seen in FIG. 1 above.

As described above, according to the present invention, each of the above-mentioned light bulbs is placed in a vacuum chamber after completing the exhaust sealing work, and in a low temperature state,
The ion blating method using high-frequency excitation is adopted, and the metal material used to form the film is tin oxide and a trace amount of antimony oxide.
Because we use a highly heat-resistant formulation for the coating material, in other words, we actively select the best manufacturing method, so it is possible to avoid high temperatures of 500 degrees Celsius in the spray method or as seen in the vapor deposition method. Secondary processes such as reheating can be omitted, which reduces work time, and also eliminates damage to each bulb and penetration of coating material particles into each bulb, improving characteristics such as life and appearance. Furthermore, since the film is processed after each bulb is sealed, it can be manufactured without major changes to the existing line, which not only reduces the number of manufacturing steps but also reduces the film thickness during film formation compared to the spray method As stated at the beginning of this section, it also has the additional effect of allowing extremely free control of the heat rays, can speed up film formation, has no characteristic deterioration due to temperature rise of each light bulb, and can suppress heat radiant energy to a sufficiently low level. It produces various effects that fully achieve the stated purpose.

It goes without saying that this does not preclude the formation of a protective film of a suitable material on the metal oxide film formed diagonally in order to protect the film.

[Brief explanation of the drawing]

Fig. 1 shows an example of the characteristics of metal oxide film materials formed in various light bulbs, and Fig. 2 shows the heat ray cutting characteristics according to the present invention. In each figure, the vertical axis is the transmittance %t, and the horizontal axis is the Wavelength μm'r
, respectively.

Claims (1)

[Claims] 1. In a reflective incandescent light bulb or a general incandescent light bulb comprising a lens part and a reflector part, the inside of each of the light bulbs is evacuated, a prescribed gas is introduced and sealed, and then these are placed in a vacuum chamber, Introducing oxygen gas and forming a metal oxide film made of tin oxide (SnO2) and antimony oxide (Sb203) on the outer surface of the lens portion or a predetermined portion by ion blating using high frequency excitation. A manufacturing method for incandescent light bulbs that features cut-off heat rays.