JPS6168857A - Halogen 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] [Technical field of invention] The present invention relates to a halogen light bulb with a long lifespan and a long life.

[Technical background of the invention and its problems] Conventional halogen light bulbs have a tungsten filament sealed inside a heat-resistant glass bulb, and a special halogen is sealed inside the bulb. The tungsten halide is evaporated in the form of tungsten halide WX and returned to the filament, and the tungsten halide is thermally decomposed on the filament to deposit tungsten. As a result, the blackening of the bulb and the wear and tear of the filament are prevented, resulting in high efficiency. , which provides a long service life.

Therefore, in conventional halogen light bulbs, tungsten halide, which has a relatively high evaporation temperature, is at a temperature of 300 to 500°C in various parts of the tube, such as the inner conductor.

It is deposited on support members such as supports and anchors, and on the coldest parts of valves and removed from the reaction system. Therefore, it is necessary to fill in excess halogen to account for this removed amount. In particular, in the case of a small halogen cage with a small load on the tube wall, each part inside the tube is cooled rapidly, so a large amount of halogen is deposited, and it is necessary to seal in a particularly large amount of halogen.

However, in recent years, a visible light transmitting infrared reflective film has been provided on at least one of the inner and outer surfaces of the bulb, and the infrared light emitted from the filament is reflected and returned to the filament. They have been developed to heat up to improve efficiency and reduce infrared radiation. However, in this halogen bulb, some of the reflected infrared rays enter the support member and heat it, and the infrared rays reflect inside the bulb many times and pass through the bulb wall, heating it. As the temperature of the parts and the coldest part of the valve increases, the amount of tungsten halide deposited decreases, and this decrease increases the amount of halogen that participates in the reaction, causing abnormal corrosion of the tungsten filament and shortening its life.

In response to this, the present inventor has developed a halogen light bulb in which the bulb is provided with an air-cooled protrusion on which tungsten halide is deposited to limit the amount of halogen participating in the reaction.

It was proposed as i%953-189947. This proposal dramatically reduces the short lifespan due to excess halogen, but on the other hand, there is a risk of breakage accidents due to the long protrusion of the air cooling protrusion.

[Objective of the Invention] An object of the present invention is to provide a halogen light bulb that has a tube efficiency, emits less infrared radiation, has a long life, and is less likely to break.

[Summary of the invention g] A filament is sealed along the axial direction of a tubular bulb provided with a visible light-transmissive infrared reflective film on at least one of the inner and outer surfaces, and the infrared reflective film is particularly provided at the end of the bulb. By not providing this, the temperature rise of the bulb wall at this end is reduced, and as a result, excess tungsten halide is deposited on the inner surface of this bulb end, thereby eliminating the harmful effects of excess halogen.

[Embodiments of the Invention] The details of the present invention will be explained with reference to the following embodiments.The first embodiment is a small halogen cell used for light projection, and its details are shown in FIG. (1) is a transparent tube-shaped bulb made of heat-resistant glass such as quartz glass, (2) is a visible light transmitting infrared reflective film formed on the outer surface of this bulb (1), and (3) is a transparent tube-shaped bulb made of heat-resistant glass such as quartz glass. A sealing portion formed by crushing and sealing, (4), (4) is a pair of molybdenum introduced foils embedded in this sealing portion (3), (5), (5)ri this introducing foil (4). , (4) is connected to a pair of inner conductors introduced into the valve (1), and (6) is connected to these inner conductors (51).
, (5) a tungsten coil filament mounted between them and located at the central axis of the bulb (1), (7) d an anchor supporting the middle part of this filament (6), and (8) a The sealing residue (9) of the exhaust pipe provided at the top end αυ is the cap attached to the base of the valve (1), and inside the valve (1) there is an inert gas such as argon and a necessary halogen such as methylene. Bromide (CH2Br
2) etc. are included. Thus, the feature of the present invention is that the top end (1) of the bulb (1), i.e., the residual mark (8), and a range of several meters around this residual mark (8), preferably the outer diameter of the coil filament (6). In particular, no variable, light-transmitting, infrared-reflecting film is provided in the area of 1 to 2 times the area.

The visible light transmitting infrared reflective film (2) is made of titanium oxide (Ti).
A high refractive index layer consisting of silica (S i02) etc.
) and other low refractive index layers, which are alternately laminated in 7 to 9 layers, and transmit visible light and reflect infrared rays due to light interference. Various methods are known for forming such an infrared reflective film (2). For example, the bulb (1) is immersed in an organic titanium compound solution, pulled up, dried, and fired to form a high refractive index No. 8, and then immersed in an organic silicon compound solution, pulled up, dried, and fired to form a low refractive index layer. The two steps may be repeated alternately. At this time, the valve (1
) is applied by dipping it in the above solution, and then wiping off the solution adhering to the top end αυ before drying can prevent the formation of an infrared reflective film on the top end αυ.

When this halogen bulb is turned on, the filament (6) generates heat and emits visible light as well as Omachi's infrared rays. Of these lights, visible light is directly emitted to the outside, while infrared rays are completely reflected by the infrared reflective film (2), and most of it returns to the filament (6) and heats it to improve efficiency. is incident on the inner conductor (5) and the anchor (power) and heats it.Also, when the infrared rays pass back and forth through the bulb (1), a part of it is absorbed by the bulb wall and heats it. Therefore, the inner groove llI41 (5), the anchor (7
) and the sides of the valve (1) become hot, and tungsten halide, which has a high evaporation temperature, will not be deposited on these.

However, in this embodiment, since no infrared reflecting film is provided on the top end (1) of the bulb (1), the infrared rays of the bulb wall at this top end 0υ are unidirectional; ) is located in the axial direction of the filament (6), so less infrared rays are incident on this top end (In-). The inner surface temperature of the top end αυ reaches only about I'1350"C, and tungsten halide with a high evaporation temperature is deposited on this inner surface and the support part in the vicinity, reducing the amount of halogen participating in the reaction inside the bulb (1). Therefore, the halogen bulb of this example can prevent corrosion of the filament (6) due to excess halogen and has a long life.Furthermore, since the temperature of the inner surface of the residual mark (8) is lower than that of the inner surface of the top end α, the tungsten halide light bulb has a long life. can be deposited in higher amounts, making it particularly desirable for alpine calorogen bulbs.

Next, another embodiment is shown in FIG. This bulb has almost the same structure as the bulb of the first embodiment, except that there is no trace of an exhaust pipe on the top end of the bulb (1).

Therefore, the same parts as in FIG. 1 are given the same reference numerals, and the description thereof will be omitted. This light bulb also has a filament (6
), the infrared light is emitted from the filament (6)
to improve efficiency. In addition, due to this reflected infrared rays, the temperature of the sealing member and the side wall of the bulb (1) rises, preventing the deposition of tungsten halide, but the top end (
1) Since the temperature of the inner surface is low, tungsten halide is deposited here and takes part in the reaction inside the bulb (1).) Since the amount of halogen is lowered, the same short life caused by excess halogen as mentioned above can be avoided. The light bulb of this embodiment is suitable for low output halogen light bulbs.

Although the explanation was omitted in both of the above-mentioned embodiments, the same effect can be obtained unless a visible light transmitting and infrared reflecting film is particularly provided on the curved portion of the sealing side of the bulb (1).

Furthermore, in a double-capped halogen light bulb, if an infrared reflective film is not provided on at least one surface of both ends, the same effect as in the above embodiment can be obtained. The effects of the present invention can be obtained even if the tube is provided on both the inside and outside. Furthermore, even if a reflective film is present at the end, the effect of the present invention can be obtained if the infrared reflectance of this part is extremely low and tungsten halide is deposited on the inner surface of the end.

[Effects of the Invention] The halogen bulb of the present invention has a visible light transmitting infrared reflecting film on at least one of the inner and outer surfaces excluding the end of the tube-shaped bulb in which the filament is sealed along the axial direction! Excess tungsten halide is deposited on the inner surface of the apical end.The amount of halogen participating in the halogen cycle is limited, and the infrared reflective coating prevents corrosion of the filament due to excess halogen caused by the infrared reflective coating. It is the lifespan.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the halogen light bulb of the present invention, and FIG. 2 is a sectional view of the top portion of another embodiment.

Claims (1)

[Claims] (1) A visible light transmitting infrared reflecting film is provided on at least one of the inner and outer surfaces excluding the end of a tubular bulb in which a filament is sealed along the axial direction, and tungsten halide is deposited on the inner surface of the end of the bulb. A halogen light bulb characterized by: