JPH06290762A - Halogen lamp - Google Patents

Abstract

PURPOSE:To provide a halogen lamp wherein an effective region of an infrared reflecting film can be largely taken while satisfying requirement of a tube wall load and pressure resistance. CONSTITUTION:A halogen lamp 11 comprises a bulb 13 formed with an infrared reflecting film 19 in the external surface, filament 12 arranged in the bulb 13 and a seal part 14 provided in one end of the bulb 13. The inside of the bulb 13 is sealed with gas of 6atm or more, and the bulb 13 is constituted of an almost spherical bulb having a 12mm to 18mm diameter, to set a width W to 6 to 10mm and thickness T to 1.3 to 2mm, of the seal part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen bulb,
In particular, the present invention relates to a halogen bulb for automobiles provided with an infrared reflection film on the outer surface of the bulb.

[0002]

2. Description of the Related Art Halogen bulbs contain a small amount of halogen element in a bulb, and by utilizing a so-called halogen cycle, evaporation of tungsten can be suppressed and at the same time blackening of the bulb can be prevented. is there.
Therefore, it is widely used in automobile light bulbs and the like, which are desired to be downsized and have a long life.

On the other hand, in order to satisfy the characteristics and safety required for a light bulb for automobiles, the size and shape of the bulb must be determined in consideration of the wall load and pressure resistance when designing the bulb.

FIG. 5 shows a conventional halogen bulb 1 for an automobile, and as can be seen from the figure, a cylindrical bulb 2 is used.

A filament 3 is arranged in the bulb 2, and an infrared reflection film 4 is coated on the outer surface of the filament 3.

Here, when the filament 3 is energized, a part of the infrared rays emitted from the filament 3 is reflected by the infrared reflection film 4 and returns to the filament 3, and the halogen bulb 1
The efficiency of can be improved.

[0007]

However, the radiation direction of infrared rays that can be returned to the filament 3 is limited to a range of about 5 mm from both sides of the center of the filament (filament center), and the infrared rays are radiated out of the range. The infrared rays radiate outside without returning to the filament 3. Therefore, even if the infrared reflecting film is provided outside the above range, there is a problem that the original function of the infrared reflecting film cannot be exhibited.

In other words, in the cylindrical bulb, the effective area of the infrared reflecting film cannot be made large.

For this reason, in the halogen bulb using the cylindrical bulb, even if the infrared reflecting film is provided, the improvement of the efficiency is limited to about several percent.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a halogen light bulb in which the effective area of the infrared reflection film can be made large while satisfying the requirements of the tube wall load and the pressure resistance. And

[0011]

In order to achieve the above object, the halogen light bulb of the present invention has a bulb having an infrared reflection film formed on at least one of the inner surface and the outer surface thereof, as described in claim 1, and the bulb. In a halogen light bulb having a filament disposed therein and a sealing portion provided at one end of the bulb, and filling the bulb with a fill gas, the gas pressure of the fill gas is 6 atm or more, and the bulb Is a substantially spherical valve having a diameter of 12 mm to 18 mm, the width of the sealing portion is 6 to 10 mm, and the thickness of the sealing portion is 1.3 to 2 mm.

[0012]

In the halogen light bulb of the present invention, the bulb has a substantially spherical shape and the width and thickness of the sealing portion are set as described above. Except for the stop, it reflects almost all around the spherical bulb and returns to the filament.

Therefore, the effective area of the infrared reflecting film is
Greatly expanded than conventional cylindrical valves.

Further, since the dimensions of the bulb are set as described above, by appropriately selecting the material and the wall thickness of the bulb, the load on the tube wall becomes equal to or lower than the deformation temperature of the bulb, and the pressure resistance during lighting becomes 10 atm. .

[0015]

Embodiments of the halogen bulb of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a halogen light bulb 11 of this embodiment. FIG. 1 (a) is a sectional view taken along a plane including a filament 12, and FIG. 1 (b) is perpendicular to the plane. It is sectional drawing along the flat surface.

In the halogen bulb 11 of this embodiment, an inert gas (Kr) and a predetermined halogen element (Br) are enclosed in a spherical bulb 13 having an infrared reflection film 19 formed on the outer surface thereof at a gas pressure of 6 atm or more. The sealing portion 14 is provided at one end.
And an exhaust pipe tip 15 is provided at the other end. The gas pressure during lighting is 30 to 40 atm.

The filament 12 contained in the spherical bulb 13 is arranged perpendicularly to an axis (hereinafter, referred to as a valve axis) connecting the sealing portion 14 and the exhaust pipe tip 15, and the internal lead wire 17a, 17b, external lead wire 18
A predetermined electric power is supplied from the outside via a and 18b.

The halogen bulb 11 of this embodiment has a spherical bulb 13 having a diameter φ of 12 mm to 18 mm, a sealing portion 14 having a width W of 6 to 10 mm, a sealing portion 14 having a thickness T of 1.3 to 2 mm, and a lead. The line spacing D is set to 5 to 8 mm.

Here, the minimum value of the diameter φ is set to 12 mm in consideration of the limit of withstanding the gas pressure of the enclosed gas, and the maximum value is set to 18 mm to prevent the vaporization of the filament. This is to prevent the pressure from decreasing.

Further, the minimum value of the width W of the sealing portion is set to 6 mm in consideration of the limit that can withstand the enclosed gas pressure, and the maximum value is set to 10 mm in consideration of prevention of the efficiency reduction of the infrared reflection film. It was done.

Furthermore, the minimum value of the sealing portion thickness T is 1.3 m.
The value m is set in consideration of the limit of withstanding the gas pressure of the enclosed gas, and the maximum value is set to 2 mm in consideration of preventing the efficiency of the infrared reflection film from being lowered.

The spherical bulb 13 is made of, for example, hard glass. When using hard glass, the wall thickness may be 0.5 mm or more in order to withstand a pressure of 30 to 40 atmospheres or more during lighting.

In the halogen bulb 11 of this embodiment,
The valve 13 has a substantially spherical shape, and the sealing portion 1
Since the width W and the thickness T of No. 4 are set as described above, the infrared rays emitted from the filament 12 are reflected by almost the entire circumference of the spherical bulb 13 except the region where the exhaust pipe tip 15 and the sealing portion 14 are present. And returns to the filament 12.

FIG. 2 shows, without hatching, a range of infrared rays radiated from the filament 12 which is reflected by the infrared reflecting film 19 and returns to the filament 12, and a range which does not return to the filament 12 is hatched. It is a thing.

As can be seen from the figure, the effective area of the infrared reflection film 19 is up to about 340 °, which is much larger than that of the conventional cylindrical valve.

Therefore, the efficiency of the halogen bulb is significantly improved as compared with the conventional cylindrical type, and it is improved to about 15%.

Since the valve size, valve material and wall thickness are set as described above, if the electric power is about 100 W or less, the tube wall load will be below the deformation temperature of the valve made of hard glass, The pressure resistance is 10 atmospheres or more.

Therefore, the halogen lamp for an automobile has sufficient pressure resistance.

FIG. 3 shows a halogen light bulb 21 according to a modification of the above-described embodiment. FIG. 3 (a) is a sectional view taken along a plane including a filament, and FIG. 3 (b) is It is sectional drawing along the surface perpendicular | vertical to the plane. The parts substantially the same as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The halogen light bulb 21 shown in FIG. 3 is different from the halogen light bulb 11 of FIG. 1 in that the filaments 12 are arranged parallel to each other along the bulb axis, but other than that point, it is substantially the same as the halogen light bulb 11. Have the same configuration.

That is, also in this modification, the diameter of the spherical valve 13 is 12 mm to 18 mm, the width of the sealing portion 14 is 6 to 10 mm, and the thickness of the sealing portion 14 is 1.3 to 2 m.
Since it is set to m, an effect similar to that of the above-described embodiment can be obtained.

Although the infrared reflecting film is provided on the outer surface of the spherical bulb in the above-mentioned embodiments and modified examples, it may be provided on the inner surface of the spherical bulb or on both surfaces.

Further, in the above-mentioned embodiment, the upper chip type is described as an example, but the lower chip type may be used.

[0035]

As described above, the halogen light bulb of the present invention has a bulb having an infrared reflection film formed on at least one of the inner surface and the outer surface thereof, a filament arranged in the bulb, and one end of the bulb. A halogen bulb having a sealed gas provided in the bulb, wherein the gas pressure of the sealed gas is 6 atm or more, and the bulb is a substantially spherical bulb having a diameter of 12 mm to 18 mm. Since the width of the sealing portion is 6 to 10 mm and the thickness of the sealing portion is 1.3 to 2 mm, the effective area of the infrared reflecting film is large while satisfying the requirements of the tube wall load and pressure resistance. be able to.

[Brief description of drawings]

FIG. 1 shows a halogen light bulb of the present embodiment,
Figure 1 (a) is a cross-sectional view taken along the plane containing the filament,
FIG. 1 (b) is a sectional view taken along a plane perpendicular to the plane.

FIG. 2 is a diagram illustrating the operation of the halogen light bulb of this embodiment.

3A and 3B show a halogen light bulb according to a modified example, FIG. 3A is a sectional view taken along a plane including a filament, and FIG. 3B is taken along a plane perpendicular to the plane. Sectional view.

FIG. 4 is a diagram illustrating the operation of the halogen light bulb of the present modification.

FIG. 5 is a diagram illustrating the operation of a conventional halogen bulb.

[Explanation of symbols]

 11, 21 Halogen light bulb 12 Filament 13 Spherical bulb 14 Sealing part 15 Exhaust pipe chip 17a, 17b Internal lead wire 18a, 18b External lead wire 19 Infrared reflective film

Claims (2)

[Claims] 1. A valve having an infrared reflecting film formed on at least one of an inner surface and an outer surface thereof, a filament arranged in the valve, and a sealing portion provided at one end of the valve. In the halogen bulb in which the enclosed gas is filled in, the gas pressure of the enclosed gas is 6 atm or more, the valve is a substantially spherical valve having a diameter of 12 mm to 18 mm, and the width of the sealing portion is 6 to 10
mm, and the thickness of the sealing portion is 1.3 to 2 mm. 2. The halogen bulb according to claim 1, wherein the spherical bulb is made of hard glass and has a wall thickness of 0.5 mm or more.