JPH07282786A - Halogen lamp bulb for automobile - Google Patents

Abstract

PURPOSE:To form a halogen lamp bulb for an automobile without giving dazzle to an automobile on the opposite lane due to causing a part exceeding prescribed illumination limit by realizing a bright head lamp with efficiency improved. CONSTITUTION:To a halogen lamp bulb 1 for an automobile, having a shape interchangeable with a H4 lamp bulb and high efficiency, a coil length CL1 and a coil diameter CD1 are made 3.8+ or -0.3 mm and 1.7+ or -0.1mm respectively in a travel filament 3, and a coil length CL2 and a coil diameter CD2 are made 4.8+ or -0.3mm and 1.4+ or -0.1mm respectively in a low filament 4. The shape of a spot, created by these filaments 3 and 4 and a reflecting mirror, is contracted to become a shape wherein illumination does not reach a measured point prescribed by the maximum value, and illumination at a measuring point is made within a prescribed value to solve the problem.

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 an automobile, more specifically referred to as H4 type, in which a traveling filament and a passing filament are sealed in a bulb. The present invention relates to halogen bulbs.

[0002]

2. Description of the Related Art A conventional halogen bulb for automobiles of this kind 9
FIG. 5 shows an example of the configuration of No. 0. This automobile halogen bulb 90 is called the H4 type as described above, and the traveling filament 92 and the passing filament 93 are sealed in the bulb 91. It has been stopped.

At this time, a reference position from the reference plane X is defined between the traveling filament 92 and the passing filament 93 in order to ensure compatibility at the time of replacing a light bulb. Filament 9
3 has a rear end located at a position LCL = 28.5 mm from the reference plane X, and the traveling filament 92 has a front end located D = 1.7 mm rearward from the rear end of the passing filament 93. There is.

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

[0005]

Here, the efficiency of the halogen bulb 90 for automobiles is dramatically improved with the recent technological progress, and the power consumption is 60 W / 55 W.
20% to 30% even for the automotive halogen bulb 90
To the extent that the total luminous flux is improved, it is possible to provide bright headlamps without increasing power consumption.

However, the light distribution standards for headlamps using this type of halogen bulb 90 for automobiles include, for example, 4D-V for traveling beam distribution and 4 for passing light distribution.
There are measurement points such as D-4L (however, when driving on the left side) where the maximum luminous intensity is specified to prevent dazzling an oncoming vehicle or a pedestrian.

Therefore, the conventional halogen bulb for automobile 90
It is highly likely that the above measurement points will be non-conforming when only the efficiency is improved with the above-mentioned configuration, and the car user wants to be a bright headlamp, and this kind of high efficiency car in the market When the halogen bulb 90 for use is purchased and replaced, it becomes a non-standard headlamp, which causes problems such as dazzling other vehicles, and a solution to this problem has been a problem.

[0008]

As a concrete means for solving the above-mentioned conventional problems, the present invention has a power consumption of 60 W running filament / 55 W passing filament.
In the above-described H4 halogen bulb for an automobile, the traveling filament and the passing filament are set to the prescribed positions, and the traveling filament has a coil length of 3.8 ± 0.3 mm and a coil diameter of 1.
The length of the passing filament is 4.8 ± 0.3 mm and the coil diameter is 1.4 ± 0.1 mm.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the conventional problems by providing a halogen bulb for an automobile, which is characterized by being improved in efficiency.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 is a halogen bulb for an automobile according to the present invention. In this halogen bulb for an automobile, a traveling filament 3 and a passing filament 4 are 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 surface 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 and thus, in the dimension plane, H4. Similar to the conventional example, compatibility is maintained as a standard equivalent product.

Here, the present invention is intended to guarantee the above-mentioned compatibility even in terms of the light distribution characteristics when incorporated in a headlamp, and as a means for achieving this object, the traveling filament 3 and Passing filament 4
It is said that the shape and dimensions of and will be 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 shape and dimension due to various reasons, the coil length CL
The dimensions of 1, CL2 are respected, and the coil diameters are CD1, CD2.
Adjustments will be made by the side.

The halogen bulb 1 for an automobile constructed as described above has a high efficiency of 1300 lm, which is 30%, which is 1000 lm in the past when the passing filament 4 is, for example, by enclosing special gas. It is supposed to be. In addition, what is indicated by reference numeral 5 in the drawing is
It is a hood similar to the conventional example that covers substantially the lower half of the passing filament 4.

Next, the operation and effect of the halogen bulb 1 for an automobile of the present invention having the above-mentioned structure will be described. 2 and 3 show the state of the reflected light generated by the reflecting mirror 11 when the automotive halogen bulb 1 is attached to the headlamp 10 in the case of the passing filament 4.

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 with the hood 5, and the reflecting mirror 1 is used.
The reference numeral 1 will be described as a paraboloid of revolution that matches the focal point P with the rear end of the passing filament 4.

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

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 by the reflecting mirror 11 is in front (H line- (The intersection of V lines: see FIG. 3), and at the same time, 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, when the head lamp 10 in front of the reflecting mirror 11 is sufficiently far away to irradiate, the reflected light from the passing filament 4 from the reflecting mirror 11 is shown in FIG.
As shown in FIG. 5, the spot S2 has a semicircular shape of the upper chord. By appropriately diffusing the spot S2 with the lens 12, the light distribution characteristic suitable for running is finally formed.

Therefore, the spot S2 is the basis of the light distribution characteristic in terms of shape and brightness, and particularly in terms of brightness, it remains within this spot S2 even after the diffusion by the lens 12. The range tends to be bright. The size of the spot S2 is determined by the inclination angle α, and the inclination angle α is determined by the coil length CL2 of the passing filament 4, so
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 value thus obtained 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. Since the hood is not provided on the traveling filament 3 at this time, the shape of the spot S1 is circular. Then, similarly, the 4D-V measurement point is the spot S.
The value of the running filament 3 determined so as not to fall within 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 bulb for automobiles, which has a shape compatible with a 4-inch 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 reflector 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 keep the illuminance at the measurement point within the specified value, and thus it is possible to provide a bright headlamp that does not cause dazzling oncoming vehicles, which is an extremely excellent effect. .

[Brief description of drawings]

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

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

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

FIG. 4 is an explanatory diagram showing a 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]

 1 ... Halogen bulb for automobiles 2 ... Valve 3 ... Running filament 4 ... Passing filament 5 ... Hood CL1 ... Running filament coil length CL2 ... Passing filament coil length CD1 ... Running filament coil diameter CD2 ...... Passing filament coil diameter

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[Procedure amendment]

[Submission date] February 9, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

However, the light distribution standards for headlamps using this type of halogen bulb 90 for automobiles include, for example, 4D-V for traveling beam light distribution and 4 for passing light distribution.
There are measurement points such as D-4L (however, when driving on the left side) where the maximum light intensity is specified in order to suppress the brightness in front of the road surface and make it easy to visually recognize a distance on the road surface.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Therefore, the conventional halogen bulb for automobile 90
It is highly likely that the above measurement points will be non-conforming when only the efficiency is improved with the above-mentioned configuration, and the car user wants to be a bright headlamp, and this kind of high efficiency car in the market When the halogen bulb 90 for use is purchased and replaced, it becomes a non-standard headlamp, which causes problems that the front side of the road surface becomes too bright and it becomes difficult to visually recognize the far side of the road surface. It was supposed to be.

Claims (1)

[Claims] 1. A halogen light bulb for an automobile, which has a power consumption of 60 W / passing filament 55 W or more and has an H4 shape, wherein each of the traveling filament and the passing filament is set at a predetermined position, and the traveling filament is Is the coil length 3.8 ±
0.3mm, the coil diameter is 1.7 ± 0.1mm, the passing filament has a coil length of 4.8 ± 0.3mm and a coil diameter of 1.4 ± 0.1mm, and high efficiency. Halogen bulbs for automobiles, which are characterized by