JP2001122018A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight for vehicle remarkably improved in the visibility of luminous intensity distribution pattern, especially in the forward visibility in a curved road. SOLUTION: Single high luminance discharge lamp 2 is arranged in front parts 5a of an automobile 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight for a vehicle, which is disposed at a front portion of a vehicle such as an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 10, for example, a vehicle headlight of this type is a two-light room type headlight that can be moved left and right by controlling the rotation of a steering wheel or the like, as shown in FIG. And irradiates a passing light distribution pattern.

[0003]

However, in the above-mentioned conventional vehicle headlamp, the headlamp is turned to the right by turning the steering wheel to the right, for example, from the lighting state in which the front side is indicated by a broken line. Since it moves, the light distribution pattern shown by the solid line is obtained, and the light does not reach the hatched portion shown in FIG. 10, and the visibility may be reduced. Further, known headlamps for vehicles have a combined light distribution pattern of left and right headlights, and thus tend to be slightly shifted left and right, and there is a need for improvement in the visibility of shifted portions. Further, the extended portion of the 15-degree cut-off line may irradiate an outside mirror such as a door mirror of a vehicle traveling ahead of the own vehicle, resulting in glare.

[0004] The present invention has been made in order to solve the above problems.
It is an object of the present invention to provide a vehicular headlamp capable of significantly improving the visibility of a light distribution pattern, and in particular, improving forward visibility in a curved road direction.

[0005]

According to a first aspect of the present invention, a single high-intensity discharge lamp is provided at the front of a vehicle.

According to the first aspect of the present invention, since there is only one lamp, the light distribution pattern is not formed, and the light distribution pattern is not shifted. Symmetrically arranged at the front of the vehicle, the degree of freedom of the layout at the front of the vehicle is significantly increased. In addition, by using a high-intensity discharge lamp as a lamp, visibility can be secured to a distant place, so that visibility is significantly improved.

According to a second aspect of the present invention, there is provided the vehicle headlight according to the first aspect, wherein the position where the high-intensity discharge lamp is disposed is a front side of a driver's seat.

According to the second aspect of the present invention, when the driver performs nighttime driving control, the high-intensity discharge lamp is arranged in front of the driver's seat, so that the cut line that forms a predetermined angle with respect to the horizontal line is formed. Since it can be set up to the vicinity of the driver's seat side, it is possible to increase the ratio of the light distribution pattern portion that irradiates the farthest distance and improve the visibility at a long distance.

According to a third aspect of the present invention, there is provided the vehicle headlight according to the first aspect, wherein a steering lamp is disposed near an outer side of the vehicle with the high-intensity discharge lamp interposed therebetween.

According to the third aspect of the present invention, since the high-intensity discharge lamp is a single lamp, the irradiation direction can be widened by disposing the steering lamp at an appropriate position near the outer portion of the vacant vehicle. It can illuminate the oblique front side of the vehicle. In addition, by lighting the vicinity of the outside of the vehicle, the width of the vehicle can be recognized by the oncoming vehicle and the preceding vehicle.

According to a fourth aspect of the present invention, there is provided the vehicle headlight according to the third aspect, wherein the high-intensity discharge lamp is provided near one of the steering lamps.

In the invention according to claim 4, since one of the high-intensity discharge lamp and one of the steering lamps is provided close to each other, these two lamps look as if they are one lamp, and the oncoming vehicle Prevent the preceding vehicle from misrecognizing the vehicle width. That is, it is possible to prevent the traveling vehicle from being mistaken for a motorcycle.

According to a fifth aspect of the present invention, there is provided the vehicle headlamp according to any one of the first to third aspects, wherein the high-intensity discharge lamp is of a projector type.

According to the fifth aspect of the present invention, since the high-intensity discharge lamp is a projector type, in which visibility is remarkably improved because a visibility can be secured to a distant place, and since it is of a projector type, a boundary between an irradiation range and a non-irradiation range is obtained. The formation of the line becomes clear, and the illuminance can be set high up to the upper boundary of the irradiation range. As a result, the field of view can be secured far away.

The invention according to claim 6 is the vehicle headlight according to claim 4, wherein the light distribution pattern of the high-intensity discharge lamp is a Z-beam pattern.

According to the sixth aspect of the present invention, the light distribution pattern of the high-intensity discharge lamp is such that even if the light amount of the lamp is increased, almost no light is present in a portion near the cut line (the light and dark area of the pattern) where there is no light. Since the cut line pattern is a Z-beam pattern, there is no possibility that light in the irradiation range will be incident on the position of the outside rearview mirror of the front vehicle. In other words, dazzling the driver of the vehicle ahead
It can be surely prevented.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the present invention will be described.
This will be described with reference to FIGS.

A vehicle headlamp 1 shown in this embodiment is shown in FIG.
As shown in FIG. 1, the vehicle 5 is composed of a single high-intensity discharge lamp 2 and a plurality of steering lamps 3 and 4 arranged at a front portion 5a of a vehicle 5 as a "vehicle". The high-intensity discharge lamp 2 is provided on the side of a driver's seat (not shown), that is, on a road where an oncoming vehicle travels, a vehicle is provided on the side of an oncoming vehicle. 5 is arranged only on the side to be held during traveling (example on the left side in Japan and on the right side in the United States). The steering lamps 3 and 4 are disposed on the left and right sides of the traveling direction with the high-intensity discharge lamp 2 interposed therebetween, and one steering lamp 3 is disposed at a position close to the high-intensity discharge lamp 2.

As shown in FIG. 2, the high-intensity discharge lamp 2 is composed of a projector-type headlamp and includes an arc tube P1, a reflector P2, a shade P3, a convex lens P4, and the like. 300 lux on the screen a meter away. Arc tube P1
Uses a light source that encloses xenon gas (Xe gas) or the like and applies a high voltage to cause arc discharge to emit light. The reflector P2 is configured by a composite elliptical surface. Then, by projecting the shadow formed by the shade P3 forward, the light distribution pattern
It is possible to obtain a sharp cut-off line (boundary line between an irradiation range and a non-irradiation range).

The basic light distribution pattern P of the high-intensity discharge lamp 2
As shown in FIG. 4, a shadow 5 formed by the shade P3 is projected forward to obtain a sharp cut-off line P6 (a boundary between an irradiation range and a non-irradiation range).
However, the cutoff line P6 of the basic light distribution pattern P5
Is formed horizontally and is lower than the outside rearview mirror D such as a door mirror of a preceding vehicle. In FIG. 4, the portion surrounded by hatching has twice the amount of light of the halogen light source, and the portion not covered by hatching has the same amount of light as the halogen light source. The symbol M is the position of the maximum illuminance (300 lux).

As shown in FIG. 5, the irradiation range of the high-intensity discharge lamp 2 is the center line A2 side (the side of the oncoming vehicle traveling path A4) on the own vehicle traveling path A on the road where the traveling path A4 of the oncoming vehicle exists. The optical axis P8 is located at a position, and light is emitted so as to form the basic light distribution pattern P7 on the road surface.
That is, not only the traveling path A of the own vehicle, but also the traveling path A of the oncoming vehicle over the roadside A1 and the center line A2 on the traveling path A side of the own vehicle.
4 can be widely irradiated.

As shown in FIG. 5, the side of the road A1 means an outer pedestrian road side zone which is separated by a line A3 from the running path A of the vehicle as a roadway. Also, depending on the road, the portion of the line A3 may be the outermost side of the roadway. In this case, the portion inside the outermost side of the roadway becomes the roadside A1. Furthermore, the position corresponding to the line A3 may be constituted by a curb. In this case, the roadside A1 through which a pedestrian or the like passes is outside the curb or inside the curb. Also, depending on the road, the traveling path A4 of the oncoming vehicle
May not be present, and in such a case, it means that the high-intensity discharge lamp 2 exists on the side of the road A1 on the side of the vehicle running road A and on the side of the road opposite to the side.

As shown in FIG. 3, each of the steering lamps 3 and 4 is composed of a diffused light distribution type headlight, and includes an arc tube K1, a reflector K2, a shade K3,
The configuration includes a rotation axis K4 of the reflector K2, a motor K5 for rotating the reflector K2 around the rotation axis K4, and the like. Like the arc tube P1, the arc tube K1 uses a light source that encloses xenon gas (Xe gas) or the like and applies a high voltage to cause arc discharge to emit light. It emits light with a maximum illuminance of about 200-300 lx (lux) on a screen 10 meters away. The reflector K2 is rotated by a motor K5 by detecting a steering angle detected by rotating a steering wheel (not shown), and irradiates the turning direction. When the steering wheel is turned back, it is more preferable that the light distribution direction matches the driver's line of sight by performing control such as returning the steering wheel to the front direction prior to steering.

As shown in FIG. 6, the diffused light distribution pattern K6 of the steering lamps 3, 4 is a pattern slightly lower than the horizontal cut line H, and has a light amount that is half of the halogen light amount. . In FIG. 6,
The symbol M indicates the position of the maximum illuminance (200 to 300 lx) when the steering lamps 3 and 4 are both turned on.

In FIG. 7, K7 indicates a road surface light distribution pattern by the steering lamps 3 and 4. However, the road surface diffusion light distribution pattern K7 shown in FIG.
Is a right turn, and the optical axis is directed obliquely forward and to the right of the vehicle 1.

When the vehicle headlamp 1 including the single high-intensity discharge lamp 2 and the plurality of steering lamps 3 and 4 is turned on together, as shown in a combined light distribution pattern shown in FIG.
The diffused light distribution pattern K6 of the steering lamps 3, 4 is
Basic light distribution pattern P excluding the cutoff line P6
The range is equivalent to 5. As described above, the amount of light of the high-intensity discharge lamp 2 is equal to that of the halogen light source and half of the steering lamps 3 and 4 of the halogen light source are combined. By being equivalent to a light source, the light amount is equivalent to two halogen light sources. In other words, the high-intensity discharge lamp 2 that does not move has the light amount for one lamp, and the moving steering lamps 3 and 4 also have the light amount for one lamp.
The light distribution balance is good.

When the single high-intensity discharge lamp 2 and the plurality of steering lamps 3 and 4 are turned on and the steering lamps 3 and 4 are turned around the rotation axis K4, Since the diffuse light distribution pattern K6 moves to the left and right with respect to the basic light distribution pattern P5 as shown in FIG. 9, a darkened portion (hatched portion) does not occur unlike the conventional case shown in FIG. Therefore, not only is it possible to confirm the front more reliably, but also by turning on the steering lamps 3 and 4 provided in the vicinity of the outer side of the car 5, the oncoming car and the preceding car can recognize the width of the car 5 Can be.

In the vehicular headlamp 1 configured as described above, since there is only one high-intensity discharge lamp 2 as a lamp, the passing light distribution patterns are not synthesized, and the light distribution patterns do not shift. As a result, the visibility is remarkably improved, and the lamps are conventionally arranged symmetrically on the front part 5a of the vehicle 5, whereas the degree of freedom of the layout of the front part 5a of the vehicle 5 is significantly increased.

When the driver controls the operation at night, the high-intensity discharge lamp 2 is arranged in front of the driver's seat (not shown). Since the distance can be set closer to the center of the road, the proportion of the light distribution pattern portion that irradiates the farthest can be increased. In addition, although the high-intensity discharge lamp 2 is a single lamp, it has the same light quantity as the two-lamp type, and does not have a combined light distribution pattern. Therefore, the vicinity of the cut line that forms a predetermined angle with the horizontal line Is increased as compared with a conventional two-lamp type lighting device having a combined light distribution pattern, and the distance visibility can be improved.

Since the high-intensity discharge lamp 2 is a single lamp, the steering lamps 3 and 4 can be arranged at appropriate positions on the front portion 5a of the vacant automobile 5, so that the automobile 5
Not only the side of the vehicle, but also the direction of irradiation can be expanded, and the oblique front side of the vehicle can be irradiated.

In the high-intensity discharge lamp 2, not only the visibility can be remarkably improved because the visibility can be secured to a distant place, but also in the projector type in the embodiment, the cut-off line H which is a boundary line between the irradiation range and the non-irradiation range. Since the formation of is clear, the illuminance can be set high up to the upper boundary of the irradiation range, and since there is no synthesized light distribution pattern, there is no danger that irregular light will be irradiated to the area where light is not irradiated, as a result, It will be possible to secure a view to a distant place. Such a high-intensity discharge lamp 2 and steering lamps 3, 4
By being lit simultaneously, it is possible to give the oncoming vehicle a recognition that an automobile such as a four-wheeled vehicle is running. That is, it is possible to prevent the traveling vehicle from being mistaken for a motorcycle. When the high-intensity discharge lamp 2 and the steering lamp 3 are arranged in a close position, the high-intensity discharge lamp 2
And the steering lamp 3 look like a single lamp, and together with the steering lamp 4, it looks like a two-lamp headlight for oncoming vehicles, etc., and not only does not cause discomfort but also automobiles such as four-wheeled vehicles run The oncoming vehicle can give recognition of what is being done. That is, the traveling vehicle is
It can be further prevented from being mistaken for a motorcycle.

The light distribution pattern of the high-intensity discharge lamp 2 is Z
Since the beam pattern is used, even if the cut line at a predetermined angle is set near the center of the road, there is no risk that light in the irradiation range will be incident on the position of the outside rearview mirror D of the preceding vehicle. Since there is almost no position at the outside rearview mirror D near the light and dark area of the pattern), there is no possibility that light will enter the outside rearview mirror D of the vehicle ahead. That is, dazzling of the driver of the vehicle ahead can be reliably prevented.

When the steering lamps 3 and 4 turn in association with the steering of a steering wheel (not shown) or with known control means such as navigation, the vehicle turns wider at the curve running or at the intersection shown in FIG. By turning and irradiating the steering lamps 3 and 4 which are auxiliary lamps for improving the visibility of the range or the side, the light distribution pattern can be changed to substantially match the driver's line of sight. The control means such as the navigation is well-known, and thus the description is omitted.

[0034]

According to the first aspect of the present invention, since there is only one lamp, the light distribution pattern does not become a composite light distribution pattern. Are arranged symmetrically at the front of the vehicle, but the degree of freedom in the layout of the front of the vehicle is significantly increased. In addition, by using a high-intensity discharge lamp as a lamp, visibility can be secured to a distant place, so that visibility is significantly improved.

According to the second aspect of the present invention, when the driver performs nighttime driving control, the high-intensity discharge lamp is arranged in front of the driver's seat, so that the cut line forms a predetermined angle with the horizontal line. Can be set to the vicinity of the driver's seat side,
The proportion occupied by the light distribution pattern portion that irradiates the farthest can be increased. Moreover, since the lamp has the same light quantity as that of the two-lamp type even though there is only one lamp, the light quantity near the cut line that forms a predetermined angle with respect to the horizontal line is the same as the conventional two-lamp type lamp. Therefore, the distance visibility can be improved.

According to the third aspect of the present invention, since the high-intensity discharge lamp is a single lamp, the steering lamp is arranged at an appropriate position near the outer side of the vacant vehicle to illuminate the oblique front side of the vehicle. And the range that can be irradiated can be significantly increased.

According to the fourth aspect of the present invention, since the high-intensity discharge lamp and one of the steering lamps are provided close to each other, these two lamps look as if they are one lamp, and the oncoming vehicle Prevent the preceding vehicle from misrecognizing the vehicle width. That is, it is possible to prevent the traveling vehicle from being mistaken for a motorcycle.

According to the fifth aspect of the present invention, since a high-intensity discharge lamp having a markedly improved visibility by securing a visibility to a distant place and a projector type, a boundary between an irradiation range and a non-irradiation range is obtained. The formation of the line becomes clear, and the illuminance can be set high up to the upper boundary of the irradiation range. As a result, the field of view can be secured far away.

According to the sixth aspect of the present invention, the light distribution pattern of the high-intensity discharge lamp is such that even when the light amount of the lamp is increased, almost no light is present in a portion near the cut line (the light and dark area of the pattern) where there is no light. Since the cut line pattern is a Z-beam pattern, there is no possibility that light in the irradiation range will be incident on the position of the outside rearview mirror of the front vehicle. In other words, dazzling the driver of the vehicle ahead
It can be surely prevented.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a vehicle provided with a vehicle headlamp according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a high-intensity discharge lamp in the vehicle headlamp of FIG.

FIG. 3 is a cross-sectional view showing a steering lamp in the vehicle headlight of FIG.

FIG. 4 is an explanatory diagram showing a basic light distribution pattern when the high-intensity discharge lamp of FIG. 2 is turned on.

FIG. 5 is an explanatory view showing a basic light distribution pattern on a road surface when the high-intensity discharge lamp of FIG. 2 is turned on.

FIG. 6 is an explanatory diagram showing a diffuse light distribution pattern when the steering lamps of FIG. 3 are both turned on.

FIG. 7 is an explanatory view showing a basic road surface light distribution pattern and a road surface diffused light distribution pattern when turning a curve when both of the steering lamps of FIG. 3 are turned on.

8 is an explanatory diagram showing both a basic light distribution pattern and a diffuse light distribution pattern in the vehicle headlight of FIG. 1;

9 is an explanatory diagram showing a state in which a diffuse light distribution pattern in the vehicle headlight of FIG. 1 is moved with respect to a basic light distribution pattern.

FIG. 10 is a diagram illustrating a problem in a light distribution pattern of the headlight in the vehicle headlight.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 High intensity discharge lamp 3, 4 Steering lamp 5 Car 5a Front of car

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F21Y 101: 00 (72) Inventor Takayuki Kawamura 80 Itado, Isehara-shi, Kanagawa Prefecture Ichikoh Industries Isehara Works (72) Inventor Takayuki Furuya 80 Itado, Isehara-shi, Kanagawa Prefecture Isehara Industrial Co., Ltd.Isehara Factory (72) Inventor Kazuhiro Matsumoto 80 Itado-shi, Isehara-shi Kanagawa Prefecture Isehara Industrial Co., Ltd.Isehara Factory (72) Inventor Hitoshi Nakagaki 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Toshiyuki Fujikura 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Tsuyoshi Otsuka Yokohama-shi, Kanagawa 2 Takaracho, Kanagawa-ku Nissan Motor Co., Ltd. F term (reference) 3K039 CA06 CC01 JA03 LD01 3K042 AA0 8 AC06 BB01 BC01 BD04 BE09

Claims (6)

[Claims] 1. A vehicular headlamp comprising a single high-intensity discharge lamp disposed at the front of the vehicle. 2. The vehicle headlight according to claim 1, wherein the position where the high-intensity discharge lamp is provided is a front side of a driver's seat. 3. The vehicle headlight according to claim 1, wherein a steering lamp is disposed near an outer side of the vehicle with the high-intensity discharge lamp interposed therebetween. Headlight. 4. The headlight for a vehicle according to claim 3, wherein the high-intensity discharge lamp is provided near one of the steering lamps. . 5. The vehicle headlight according to claim 1, wherein the high-intensity discharge lamp is a projector type. 6. The vehicular headlamp according to claim 1, wherein a light distribution pattern of the high-intensity discharge lamp is a Z-beam pattern. Headlight.