JP2860249B2 - Automotive halogen bulbs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen bulb used as a light source for a headlamp of a motor vehicle, and more particularly to a halogen bulb called H4 type, in which a running filament and a passing filament are sealed in an integral bulb. Pertaining to halogen lamps that have been used.

[0002]

2. Description of the Related Art A conventional halogen lamp for an automobile of this kind 9
FIG. 5 shows an example of the structure of the halogen lamp 90 for an automobile. The halogen lamp 90 for an automobile is called an H4 type as described above, and a running filament 92 and a passing filament 93 are sealed in a bulb 91. Has been stopped.

At this time, a reference position from the reference plane X is defined for the running filament 92 and the passing filament 93 in order to ensure compatibility at the time of replacing the light bulb or the like. Filament 9
Reference numeral 3 designates that the rear end is located at a position of LCL = 28.5 mm from the reference plane X, and the running filament 92 is located at the front end D = 1.7 mm behind the rear end of the passing filament 93. I have.

At the same time, the shape of each filament is also standardized. In the running filament 92, the coil length CLM is 4.7 mm and the coil diameter CDM is 1.
The reference value is 65 mm, the coil length CLS is 5.3 mm, and the coil diameter CDS is 1.27 mm in the passing filament 93. In the case of the H4 type, the lower half of the passing filament 93 is covered with a hood 94.

[0005]

Here, the efficiency of the halogen lamp 90 for automobiles has been remarkably improved with recent advances in technology, and the power consumption is the same 60W / 55W.
20-30% of the halogen lamp 90 for automobiles
The total luminous flux is improved to some extent, and it is possible to provide a bright headlamp without increasing power consumption.

[0006] However, the light distribution standard of a headlamp using this type of halogen lamp 90 for automobiles includes, for example, 4D-V in a traveling beam distribution and 4D-V in a passing beam distribution.
There are measurement points such as D-4L (in the case of left-hand traffic) where the maximum luminous intensity is specified in order to suppress the brightness in front of the road surface and make it easy to visually recognize the distant road surface.

Therefore, the conventional halogen lamp 90 for automobiles is used.
If only the efficiency is improved with the configuration as it is, there is a high possibility that the above-mentioned measurement points will be non-conforming. If a halogen lamp 90 is purchased and replaced, the headlamp becomes a non-standard headlamp, causing problems such as that the front of the road surface becomes too bright and that a distant road surface becomes difficult to see, and the solution of this point is an issue. Had become something.

[0008]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, the power consumption is 60 W of running filament / 55 W of passing filament.
In the above-mentioned and H4 shaped halogen lamp for an automobile, the running filament and the passing filament are respectively set at specified positions, and the running filament has a coil length of 3.8 ± 0.3 mm and a coil diameter of 3.8 ± 0.3 mm. 1.
The passing filament has a coil length of 4.8 ± 0.3 mm and a coil diameter of 1.4 ± 0.1 mm.
An object of the present invention is to solve the conventional problem by providing a halogen lamp for an automobile, which is characterized by high efficiency.

[0009]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a halogen lamp for an automobile according to the present invention. The halogen lamp for an automobile 1 according to the present invention has a running filament 3 and a passing filament 4 sealed in a bulb 2, and the passing filament 4 is a reference. The rear end is located at a distance of LCL = 28.5 mm from the plane X, and the running filament 3 is located at the front end at a distance of D = 1.7 mm from the rear end of the passing filament 4, whereby H4 The point that compatibility is maintained as a standard equivalent product is the same as that of the conventional example.

Here, the present invention aims to guarantee the above-mentioned compatibility also in terms of the light distribution characteristics when incorporated in a headlamp. Passing filament 4
And the shape and dimensions are changed.

Specifically, the running filament 3 is
The coil length CL1 is 3.8 mm and the coil diameter CD1 is 1.
The passing filament 4 has a coil length CL2 of 4.8 mm and a coil diameter CD2 of 1.4 mm. At this time, if it is difficult to obtain the above-mentioned dimensions due to various reasons, the coil length CL
1. The dimensions of CL2 are respected and the coil diameters CD1, CD2
It is assumed that the adjustment is made on the side.

The halogen lamp 1 for an automobile constructed as described above is filled with a special gas or the like, so that, for example, the passing filament 4 has been increased from 1000 lm in the past to 1300 lm, which is 30% more efficient. Is to be achieved. In addition, what is indicated by reference numeral 5 in the figure is:
This is a hood that covers substantially the lower half of the passing filament 4 as in the conventional example.

Next, the operation and effect of the halogen lamp 1 for an automobile according to the present invention having the above-described structure will be described. FIGS. 2 and 3 show the state of the reflected light generated by the reflecting mirror 11 when the halogen lamp 1 for automobiles is mounted on the headlamp 10 in the case of the passing filament 4. FIG.

Here, in order to facilitate understanding, in this description, it is assumed that only the lower half of the passing filament 4 is completely covered by the hood 5, and the reflecting mirror 1
1 is described as a paraboloid of revolution in which the focal point P coincides with the rear end of the passing filament 4.

First, FIG. 2 shows the halogen lamp 1 for an automobile.
And the reflecting mirror 11 is shown in a vertical section. At this time, since the lower half of the passing filament 4 is covered with the hood 5, light emitted from the passing filament 4 is transmitted to the upper half of the reflecting mirror 11. It will be reflected only at the point.

Further, since the rear end of the passing filament 4 coincides with the focal point P of the reflecting mirror 11, all the light emitted from the rear end of the passing filament 4 and reflected on the reflecting mirror 11 is in front (H-line). The light emitted from the front end of the passing filament 4 has an inclination angle α toward the center line Z of the reflecting mirror 11 after being reflected by the reflecting mirror 11. Becomes

Therefore, the light reflected by the passing filament 4 from the reflecting mirror 11 is not far enough to irradiate the headlamp 10 in front of the reflecting mirror 11 as shown in FIG.
As shown in FIG. 7, a spot S2 having a semi-circular shape with a first chord is formed, and the spot S2 is appropriately diffused by the lens 12, whereby a light distribution characteristic suitable for traveling is finally formed.

Therefore, the spot S2 is the basis of the light distribution characteristics in terms of both shape and brightness. In particular, in terms of brightness, the spot S2 is within the spot S2 even after the light is diffused by the lens 12. The range tends to be brighter. The size of the spot S2 is determined by the inclination angle α. Since the inclination angle α is determined by the coil length CL2 of the passing filament 4, the 4D
The coil length CL2 of the passing filament 4 may be determined so that the measurement point of −4L is not included in the range of the spot S2, and the obtained value includes the tolerance and the coil length CL2 = 4.8 ±. The value is 0.3 mm.

FIG. 4 shows the traveling filament 3 and the reflecting mirror 11.
This shows the shape of the spot S1 formed by the above. At this time, since the running filament 3 is not provided with a hood, the shape of the spot S1 is circular. Then, similarly, the measurement point of 4D-V is set to the spot S
The value of the traveling filament 3 determined so as not to be included in the range of 1 is the coil length CL1 = 3.8 ± 0.3 mm.

[0020]

As described above, according to the present invention, H
For a halogen lamp for an automobile, which has a shape compatible with the type 4 bulb and has high efficiency, the running filament has a coil length of 3.8 ± 0.3 mm and a coil diameter of 1.7 ± 0.1 mm.
The passing filament has a coil length of 4.8 ± 0.3 mm,
By setting the coil diameter to 1.4 ± 0.1 mm, the shape of the spot generated by these filaments and the reflecting mirror is reduced, and this spot does not reach the measurement point where the illuminance is specified by the maximum value. As a shape, it is possible to bring the illuminance at the measurement point within a specified value, thereby providing an extremely excellent effect that it is possible to provide a bright headlamp without causing dazzling oncoming vehicles. .

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a halogen lamp for an automobile according to the present invention.

FIG. 2 is an explanatory view showing the operation of the present invention.

FIG. 3 is an explanatory diagram showing the shape of a spot formed by a passing filament and a reflecting mirror.

FIG. 4 is an explanatory diagram showing the shape of a spot formed by a traveling filament and a reflecting mirror.

FIG. 5 is a plan view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Halogen lamp for automobiles 2 ... Bulb 3 ... Running filament 4 ... Passing filament 5 ... Hood CL1 ... Coil length of running filament CL2 ... Coil length of passing filament CD1 ... Coil diameter of running filament CD2 …… Coil diameter of passing filament

Claims (1)

(57) [Claims] 1. A halogen lamp for an automobile having a power consumption of 60 W / running filament 55 W or more and an H4 shape, wherein the running filament and the passing filament are respectively set at predetermined positions, and the running filament is disposed. Is 3.8 ±
0.3 mm, the coil diameter is 1.7 ± 0.1 mm, and the passing filament has a coil length of 4.8 ± 0.3 m.
m, and a coil diameter of 1.4 ± 0.1 mm.