JP2000294027A - Automotive light bulb and vehicle lamp using the light bulb as a light source - Google Patents

Abstract

(57) [Problem] In a conventional vehicle lighting device of this type, since the configuration of an automobile light bulb serving as a light source, a large amount of light is lost when passing light is distributed, and the traveling light distribution is reduced. Also when the light was diffused, the visibility to a distant place was low. SOLUTION: According to the present invention, a passing filament 3 is provided.
Is disposed below the center line Z of the bulb 2, the traveling filament 3 is disposed behind and below the passing filament 2, and the introduction line 5 for supporting the traveling filament and the passing filament is connected to the common introduction line 5c. An automotive light bulb 1 which is provided above both filaments as an intermediate portion and is connected to the common introduction line 5c at an end on the side adjacent to the running filament 4 and the passing filament 3
Thus, the range covered by the light-shielding hood when the passing filament is turned on is significantly reduced, so that a significantly brighter passing light distribution and a brighter traveling light distribution can be formed, thereby solving the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a vehicle lamp mainly used for lighting, such as a headlamp, and to an automotive light bulb having a structure for providing the vehicle light with optimal light distribution characteristics. .

[0002]

2. Description of the Related Art Conventionally, as an automobile light bulb 90 used in a vehicle lamp 80 of this type, a so-called H-4 type, whose main part is enlarged in FIG. 10, is generally used. The H-4 type automobile light bulb 90 is provided with a passing filament 91 for forming a passing light distribution and a running filament 92 for forming a running light distribution.

At this time, the passing filament 91 and the traveling filament 92 are linearly arranged on the center line Z of the bulb 93 with the passing filament 91 forward.
Is provided with a light-shielding hood 94 that covers a lower 165 ° range from 195 ° to 360 ° (see FIG. 11) when the automobile light bulb 90 is viewed from the front and is used for left-hand traffic.

Here, the two filaments 91 and 9 described above are used.
2 and the light-shielding hood 94 are supported in the bulb 93 by three guide lines (96a to 96c), and these three guide lines are arranged so as to be substantially vertical in a use state. The common line 96c, which becomes the ground potential in the vehicle, is disposed below and supports the light shielding hood 94.

The passing filament 91 is connected to the light-shielding hood 94 at a front end, and is connected to a traveling line 96a disposed above at a rear end.
Further, a front end of the running filament 92 is connected to the common line 96c, and a rear end of the running filament 92 is connected to a passing line 96b disposed between the running line 96a and the common line 96c. It is connected to the.

On the other hand, as shown in FIG. 11, a vehicular lamp 80 to which the automobile light bulb 90 is attached has a parabolic reflecting mirror 81 such as a paraboloid of revolution. Is installed such that the approximate center of the running filament 92 coincides with the focal point.

In the combination of the electric bulb 90 and the vehicular lamp 80 having the above configuration, when the traveling filament 92 is turned on, the traveling filament 9 is turned on.
Since 2 is located at the substantially focal point, the reflected light after reaching the reflecting mirror 81 becomes substantially parallel light rays, so that light distribution characteristics suitable for confirmation of a distant place can be obtained by irradiating in the front direction.

When the passing filament 91 is turned on, the passing filament 91 is located ahead of the focal point of the reflecting mirror 81, so that downward light is generated in the upper half of the reflecting mirror 81 and the same reflecting light is generated. Although upward light is generated in the lower half of the mirror 81, since the passing filament 91 is provided with a light-shielding hood 94 that covers most of the lower half, most of the reflected light is directed downward. It is suitable for passing light distribution.

Since the light-shielding hood 94 covers from 195 ° to 360 ° as is clear from the above description, the light-shielding hood 94 falls within the range of 15 ° from 180 ° to 195 ° in the lower half of the reflecting mirror 81. The light reaches and generates upward light, but the light from this part is irradiated to the shoulder of the road, and is used for confirmation of road signs, pedestrians, and the like.

[0010]

With the above construction, the rear end of the passing filament 91 and the traveling filament 92 which are close to each other in the light bulb 90 for automobiles.
Has a potential different from that of the front end of the vehicle, there is a risk of occurrence of leakage due to discharge, and there is a limit in arranging both close to each other. There is a problem that the traveling light distribution is excessively diffused.

In addition, since almost the entire lower half of the passing filament 91 is covered with the light shielding hood 94, almost half of the amount of light emitted from the passing filament 91 is lost. As a result, there is also a problem that the light distribution becomes darker as the power consumption increases.

[0012]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a running filament having a winding axis substantially parallel to a valve central axis and a passing filament are provided by moving the passing filament forward. The passing filament is disposed below a center line of the bulb, the running filament is disposed rearward and below the passing filament, and the passing filament passes therethrough. Three introduction lines for supporting the filament are provided substantially vertically above the two filaments with the common introduction line being the middle, and the running filament and the passing filament are adjacent to each other. A light bulb for an automobile, wherein the light bulb is connected to the common introduction line at a portion. And solves the problem by providing a vehicle lamp as a light source the automotive bulb.

[0013]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and FIG.
Is a light bulb for automobiles according to the present invention. In this light bulb 1 for automobiles, a passing filament 3 and a traveling filament 4 are supported by three lead-in wires 5 in a bulb 2 so as to extend along a central axis Z of the bulb 2. It is similar to that of the conventional example in that it is arranged as a substantially straight line substantially along.

Here, in the present invention, first, the above-mentioned three introduction lines 5 are devised. First, as shown in the drawing, all of the three introduction lines 5 are connected to the valve 2 as a first component. The second configuration requirement is that the arrangement of the three introduction lines is as follows: the passing line 5a, the common line 5c in the middle, and the traveling line 5b in the downward direction. I have.

The passing filament 3 has a front end connected to a passing line 5a, a rear end connected to a common line 5c, and the running filament 4 has a front end connected to a common line 5c. , Running line 5b at the rear end
It is connected to the. Therefore, both filaments 3, 4
The rear end of the passing filament 3 and the front end of the running filament 4 which are closest to each other have the same potential.

At this time, the passing filament 3
Are arranged so that the upper end of the coil diameter coincides with the center line Z such that the entirety is located below the center line Z, and the running filament 4 is approximately 1 mm below the passing filament 3. Are located in
Further, as described above, since the rear end of the passing filament 3 and the front end of the running filament 4 are at the same potential, there is no possibility of occurrence of discharge, and therefore, the distance is set to 1.5 mm or less.

In this embodiment, a light-shielding hood 6 extending from the passing line 5a to below the passing filament 3 is provided, and as shown in FIG.
In the range of 0 ° to 100 °, the passing filament 3
The light shielding hood 6 is not an essential component of the automotive light bulb 1 of the present invention, as described in the section of the vehicle lamp 10 later, but is required. It should just be provided according to.

Next, the automotive light bulb 1 having the above-described configuration is described.
The configuration of the vehicular lamp 10 to be combined with will be described. FIG. 4 is a schematic front view of the embodiment in which the automotive light bulb 1 and the vehicle lighting device 10 are combined when viewed from the irradiation direction side. 3, only the light-shielding hood 6 and the reflecting mirror 11 of the vehicle lamp 10 are shown. At this time, the light-shielding hood 6 is set to have a shielding angle α of 90 °.

Therefore, when the passing filament 3 is turned on, the light reaches the 270 ° portion other than the portion of the reflecting mirror 11 covered by the light shielding hood 6 (shielding angle α = 90 °). In the embodiment, the range of 270 ° of the reflecting mirror 11 is set as the passing light distribution forming region 11a, and the range of 90 ° is set as the traveling light distribution forming region 11b.

The passing light distribution forming area 11a is formed as a parabolic reflecting surface.
Since the shape of the passing light distribution is not set by a light-shielding hood like a type 4 automobile light bulb, for example, the upper half is formed as a paraboloid of revolution having a focal point f1 behind the passing filament 3 to generate downward light. Although a conventional configuration method may be used, a parabolic surface (commonly referred to as a free-form surface) in which the position of the focal point is gradually changed in the lower half of the passing light distribution forming region 11a. Thus, the shape of the passing light distribution can be obtained.

On the other hand, the traveling light distribution forming area 11
b is formed, for example, as a paraboloid of revolution having a focal point f2 at the running filament 4 (see FIG. 5), and generates reflected light in a substantially horizontal direction. FIG. 5 is a cross-sectional view along the vertical direction of the vehicular lamp 10 of the above embodiment, showing the main focus f1 in the passing light distribution forming area 11a and the focus f2 in the traveling light distribution forming area 11b described above. It is.

Here, the operation and effect when the automobile light bulb 1 of the present invention is employed will be described.
First, the range covered by the light shielding hood 6 is 16 in the conventional example.
Since the angle is reduced from 5 ° to 90 °, the low-pass light distribution forming area 1 that is effective when the low-pass filament 3 is turned on.
1a expands from 195 ° to 270 °, ie, approximately 1.3
An eight times brighter light distribution can be obtained.

Secondly, by arranging the three introduction wires 5 above the passing filament 3,
When the passing filament 3 is turned on, light is reflected on the three introduction lines 5 and shines to become a pseudo light source. All the projected images are generated below the horizontal line. Therefore, glare light can also be reduced. Further, since the passing filament 3 and the traveling filament 4 are arranged in a substantially straight line, the generation of reflected light by the traveling filament 4 when the passing filament 3 is turned on can be minimized.

Thirdly, according to the present invention, the passing filament 3 and the traveling filament 4 can be arranged close to each other, and as shown in FIG. 5, the main focus of the passing light distribution forming area 11a is clear. f1 and the focal point f2 in the traveling light distribution forming area 11b are extremely close to each other.

This means that the light that reaches the passing light distribution forming area 11a when the traveling filament 4 is turned on is similar to the light from the focal point f1 of the passing light distribution forming area 11a, that is, is close to a parallel ray. As a state, the light is reflected in the irradiation direction, and the degree of convergence is extremely high. Therefore, it is in an optimal state for forming a traveling light distribution whose purpose is to illuminate a long distance in front of the front of the vehicle brightly.According to the present invention, not only the performance of the passing light distribution described above is improved, The running light distribution also improves performance.

FIG. 6 shows another embodiment of the present invention. In the previous embodiment, an example was described in which the automobile light bulb 1 provided with the light shielding hood 6 was used. Implementation is possible even in a state where it is not provided. And
At this time, a black stripe 7a is formed on the lower surface of the bulb 2 of the electric light bulb 1 with, for example, a black paint. In this type of automotive light bulb 1, a so-called black head treatment 7 for blocking direct light from the filaments 3 and 4 is usually performed with black paint or the like. It is good.

However, when the black stripe 7a is formed in the bulb 2 as described above, the distance from the passing filament 3 is large, so that when the passing filament 3 is turned on as shown in FIG. Light passing from the passing filament 3 cannot reach a part of the portion that was the traveling light distribution forming region 11b, and cannot be blocked.

Therefore, in this case, as shown in FIG.
What is necessary is just to form the portion where the light from the passing filament 3 reaches as the passing light distribution forming region 11a,
Specifically, this portion has a focal point f3 ahead of the passing filament 3 (see FIG. 6).
What is necessary is just to produce the downward reflected light. It is needless to say that the same effects as those of the above-described embodiment can be obtained in this embodiment, and this is completely the same in the embodiments described below.

FIG. 8 shows still another embodiment, in which the black stripe 7a is not limited to the lower surface of the valve 2 as in the previous embodiment, but the right side of the valve 2 in the state shown in FIG. May be provided as black stripes 7b below the side surface in contact with the horizontal line H. In this case, as shown in FIG. 9, the shadow 7G of the black stripe 7b appears above and in contact with the horizontal line H in the right half of the light distribution characteristic D, and blocks dazzling light to oncoming vehicles.

In addition, although not shown, if the entire surface of the reflecting mirror 11 is formed as the passing light distribution forming area 11a, the light shielding hood 6, the black stripes 7a, 7b
Can be made unnecessary. In this case, 100% of the light from the passing filament 3 can be used for forming the passing light distribution, which is about 1.10 compared to the conventional H-4 type. 85 times the brightness can be obtained.

[0031]

As described above, according to the present invention, the passing filament is disposed below the center line of the bulb, the running filament is disposed rearward and below the passing filament, and the running filament and the passing filament are separated. Three guide lines for supporting are provided above the two filaments along the substantially vertical direction with the common guide line as an intermediate point, and the running filament and the passing filament are connected at the end on the side adjacent to each other. First, the range covered by the light-shielding hood when the passing filament is turned on is significantly reduced from the conventional H-4 type, and the passing light distribution formation becomes effective. By expanding the area, it is possible to form a significantly brighter passing light distribution and improve visibility, In which exhibits an extremely excellent effect in performance improvement.

Second, by arranging all three feed lines above the passing filament, when the passing filament is turned on, light is reflected on the three feed lines and shines. It is assumed that the projected images at the time of the following are all generated below the horizontal line on the light distribution characteristics. Also in this respect, the glare light is reduced, and the dazzling that occurs in the oncoming vehicle is eliminated.

Thirdly, according to the present invention, the passing filament and the traveling filament can be arranged close to each other, so that the main focus of the passing light distribution forming area and the focal point of the traveling light distribution forming area can be reduced. It is possible to approach the light, and assuming that the light reaching the passing light distribution forming area when the running filament is turned on is similar to the light from the focal point of the passing light distribution forming area, the light is directed toward the irradiation direction as a state close to parallel rays. Reflected, with a very high degree of convergence. This is an optimal state for forming the traveling light distribution, and not only the performance of the passing light distribution is improved, but also the traveling light distribution has an extremely excellent effect of improving the performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of an automotive light bulb according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of a main part of the same embodiment.

FIG. 4 is a schematic front view showing an embodiment of the vehicular lamp according to the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a cross-sectional view showing another embodiment of the vehicular lamp according to the present invention.

FIG. 7 is a schematic front view of the same alternative embodiment.

FIG. 8 is a schematic front view showing still another embodiment of the vehicular lamp according to the present invention.

FIG. 9 is an explanatory diagram showing an operation in still another embodiment.

FIG. 10 is a cross-sectional view showing a main part of a conventional automotive light bulb.

FIG. 11 is a front view showing a main part of a conventional vehicle lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Automotive light bulb 2 ... Bulb 3 ... Passing filament 4 ... Traffic filament 5 ... Introduction line 5a ... Passing line 5b ... Traveling line 5c ... Common line 6 ... Light shielding hood 7 ... Processing 7a, 7b Black stripe 10 Vehicle light 11 Reflecting mirror 11a Passing light distribution forming area 11b Running light distribution forming area f1, f2 Focus Z: Bulb center line

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsumi Yoshida 2-9-13 Nakameguro, Meguro-ku, Tokyo Inside Stanley Electric Co., Ltd. (72) Inventor Tetsuya Kudo 2-9-1-13 Nakameguro, Meguro-ku, Tokyo No. F term in Stanley Electric Co., Ltd. (reference) 3K042 AA08 AB01 AC10 BB01 BD05 BD06 BE02 BE04 BE05 BE07 CB19 CB20 CC04

Claims (3)

[Claims] 1. An automotive light bulb comprising a running filament having a winding axis substantially parallel to a central axis of a bulb and a passing filament in a substantially linear shape with the passing filament as a front, wherein the passing filament is a center line of the bulb. And the traveling filament is disposed rearward and below the passing filament,
Three introduction lines for supporting the traveling filament and the passing filament are provided substantially vertically above the two filaments with the common introduction line being the middle, and the traveling filament and the passing filament are mutually separated. An automotive light bulb connected to the common lead-in at an end on an adjacent side. 2. A light bulb for an automobile according to claim 1, wherein a light shielding means is provided below said passing filament. 3. A vehicular lamp using the light bulb for an automobile according to claim 1 as a light source.