JP2016012491A - Road illumination lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road illumination lamp that has improved visibility of an obstacle and road surface luminance while efficiently irradiates light as compared with a conventional road illumination lamp.SOLUTION: A road illumination lamp 1 illuminates a road 100 from above on which a vehicle C travels in a predetermined traveling direction X. The road illumination lamp 1 is configured to irradiate light on a pro-beam side on the traveling direction X side more than a lamp position P, and on a counter-beam side opposite to the traveling direction X more than the lamp position P. Further, an amount of a counter-beam side light irradiated on a road surface of the counter-beam side is configured to be larger than an amount of the pro-beam side light irradiated on a road surface of the pro-beam side.

Description

  The present invention relates to a road illumination lamp.

  Conventionally, a road illumination lamp that illuminates a road generally employs a symmetrical illumination system that forms a light distribution that is symmetrical with respect to the traveling direction of the vehicle.

Also, as illumination methods other than the symmetrical illumination method, a pro-beam illumination method that irradiates light in the traveling direction of the vehicle, a counter beam illumination method that irradiates light in a direction opposite to the traveling direction of the vehicle applied in a tunnel, etc. Is also known.
Of these, the former pro-beam illumination method makes it easier to visually recognize the preceding vehicle, particularly at a tunnel entrance. On the other hand, in the latter counter beam illumination system, it is possible to increase the contrast between the road surface and the obstacle on the road surface (in front of the road surface) mainly by illuminating the road surface so that the obstacle can be easily seen.

Furthermore, there has also been proposed one that seeks to obtain a combined merit by combining these illumination methods.
For example, in Patent Document 1, while combining the pro-beam illumination method and the counter beam illumination method, the amount of irradiation light on the pro-beam side (vehicle traveling direction side) is larger than that on the counter beam side (opposite to the vehicle traveling direction). A road lighting fixture constructed as described above is proposed.

Japanese Patent No. 4715430

By the way, the counter beam illumination method is effective as described above for the purpose of improving the visibility (easy to see) and the road surface brightness of the obstacle, but in the case of a lamp using a simple counter beam illumination method, the pro beam illumination method is used. Of course, it is difficult to properly illuminate between a plurality of lamps arranged side by side along the road without a dark part.
In the first place, in many road lighting fixtures currently used, it is a fact that a symmetrical illumination system is adopted because of its low level of technical difficulty.

  However, the simple symmetric illumination type road illumination lamp and the composite illumination method described in Patent Document 1 cannot provide efficient illumination because of a large amount of light toward the pro-beam. The light to the pro-beam side is less effective for the driver because it is less likely to be reflected to the vehicle (own vehicle) side even if it is irradiated on the road surface. difficult.

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a road illumination lamp capable of improving the visibility of obstacles and the road surface brightness while irradiating light more efficiently than before. And

In order to achieve the above object, the invention described in claim 1
A road illumination lamp that illuminates a road on which a vehicle travels along a predetermined traveling direction from above,
While irradiating light on the pro-beam side in the traveling direction side of the lamp position and the counter beam side on the opposite side of the traveling direction from the position of the lamp,
The counter beam side light amount irradiated on the road surface on the counter beam side is configured to be larger than the light amount on the pro beam side irradiated on the road surface on the pro beam side.

The invention according to claim 2 is the road illumination lamp according to claim 1,
A counter beam part that mainly illuminates the road surface on the counter beam side,
The counter beam portion has a light emission area of 5000 mm ² or more.

The invention according to claim 3 is the road illumination lamp according to claim 1 or 2,
As two illumination modules that illuminate different areas in the traveling direction,
A symmetrical beam portion that illuminates the road surface below the lamp so as to be symmetrical between the pro-beam side portion and the counter-beam side portion;
A counter beam portion that mainly illuminates the road surface on the counter beam side;
It is characterized by providing.

The invention according to claim 4 is the road illumination lamp according to claim 3,
The counter beam portion is inclined so that a light emitting surface faces obliquely downward on the counter beam side.

The invention according to claim 5 is the road illumination lamp according to claim 3,
The symmetric beam portion and the counter beam portion are arranged side by side with their light emitting surfaces facing in the same direction,
A reflection mirror is provided which is disposed at a portion closer to the traveling direction than the counter beam portion and reflects light emitted from the counter beam portion to the pro beam side.

The invention according to claim 6 is the road illumination lamp according to any one of claims 1 to 5,
The road is a highway.

  According to the first aspect of the present invention, since the counter beam side light amount is larger than the pro beam side light amount, the vehicle (own vehicle) side is closer than the conventional case where the light amount to the pro beam side is large. In addition to reducing unnecessary light that is not reflected, the road surface on the counter beam side can be effectively illuminated by that amount. Therefore, it is possible to improve the visibility of obstacles and the road surface brightness while irradiating light more efficiently than in the past.

According to the second aspect of the present invention, since the light emission area of the counter beam portion that mainly illuminates the road surface on the counter beam side is 5000 mm ² or more, the light emission area is greatly increased compared to the conventional case. Luminance can be reduced. Therefore, glare felt by the driver of the vehicle can be suppressed.

It is a figure which shows the road illumination lamp in embodiment with the illumination aspect. It is a figure which shows the road illumination lamp with the state attached to the pole in embodiment. It is (a) perspective view of the road illumination lamp in embodiment, (b) It is a side view. (A) It is a graph which shows the luminous intensity distribution of the light distribution by a symmetrical beam part in the cross section along the advancing direction of the vehicle in the width direction center of a road, (b) It is a graph which shows the luminous intensity distribution of the light distribution by a counter beam part is there. It is a side view of the road illumination lamp in the modification of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a road illumination lamp 1 according to the present embodiment together with its illumination mode, and FIG. 2 is a diagram showing the road illumination lamp 1 attached to a pole 120 described later, and FIG. FIGS. 2A and 2B are a perspective view and a side view of the road illumination lamp 1. FIG.

First, the configuration of the road illumination lamp 1 will be described.
As shown in FIG. 1, the road illumination lamp 1 illuminates a road 100 on which a vehicle (automobile) C travels along a predetermined traveling direction X from above.
In this embodiment, the road 100 illuminated by the road illumination lamp 1 is composed of three lanes 101 to 103 on one side and a road side (not shown) of the three-lane highway.
Two road illumination lamps 1 are provided on a two-lamp pole 120 erected in the central separation zone 110 of the highway, and individually illuminate the two roads 100, 100 on both sides.

As shown in FIG. 2, the pole 120 that supports the road lighting device 1 is formed in a Y shape with the upper portion branched in the width direction of the road 100 (direction perpendicular to the traveling direction X). Two booms 121 are inclined obliquely upward at an inclination angle α of about 10 ° with respect to the horizontal plane. Further, although not shown, a plurality of poles 120 are arranged in parallel along the road 100 at a pole interval of about 40 m.
The road illumination lamp 1 is attached downward to the respective tip portions of the two booms 121 of the pole 120. In the present embodiment, the road illumination lamp 1 is disposed at a height h of 12 m above the ground, and the boom 121 is inclined. Following this, the road 100 is slightly inclined toward the outside.

Specifically, as shown in FIGS. 3A and 3B, the road illumination lamp 1 includes two illumination modules 3 and 3 that illuminate different areas in the traveling direction X in a metal housing 2. It is a housed configuration.
The two illumination modules 3 and 3 each have a light source unit 30 exposed downward from the housing 2.
Although not shown, the light source unit 30 includes a plurality of LEDs (light emitting diodes) and a plurality of light distribution control lenses arranged in front of the LEDs arranged in a matrix.
In the present embodiment, the light emitting surface 30a of the light source unit 30 has a light emitting area of 10,000 mm ² or more. Here, the light emission area of the light emitting surface 30a is the total area of the array surface when a plurality of light distribution control lenses arranged in a matrix are viewed from the front, and a gap between two adjacent light distribution control lenses. It includes a part.
In addition, although the light emission area of the light emission surface 30a is not limited to 10000 mm < ² > or more, as mentioned later, it is 5000 mm < ² > or more from a viewpoint of reducing the glare (dazzling) which the driver | operator of the vehicle C feels. Is preferred. However, both of the two illumination modules 3 and 3 do not have to have this light emission area, and at least the light emission area of the light emitting surface 30a of the counter beam unit 32 described later is 5000 mm ² or more. I just need it.

  In the present embodiment, these two illumination modules 3 and 3 include a symmetrical beam portion 31 provided downward (with the light emitting surface 30a facing downward) in a portion on the traveling direction X side of the road illumination lamp 1. The counter beam portion 32 is provided in a portion slightly opposite to the traveling direction X in a slightly oblique direction.

Among them, the symmetric beam unit 31 illuminates the road 100 by a symmetric illumination method, and illuminates a symmetric beam illumination area LA1 below the road illumination lamp 1 on the road surface of the road 100 as shown in FIG. To do.
In the symmetric beam illumination area LA1, the portion in the traveling direction X side (hereinafter referred to as “pro beam side”) of the road illumination lamp 1 in the traveling direction X is opposite to the traveling direction X from the lamp position P. The side portion (hereinafter referred to as “counter beam side”) is substantially symmetric with respect to the lamp position P.

More specifically, as shown in FIG. 4 (a), the symmetric beam portion 31 is an in-plane along the traveling direction X with the lamp position P (that is, downward) as a reference (0 °) as the symmetric beam illumination area LA1. Illumination is performed in a range in which the irradiation angle θ is substantially equal on both the positive and negative sides.
Here, FIGS. 4A and 4B are graphs showing the luminous intensity distribution of the light distribution by the symmetric beam portion 31 and the counter beam portion 32 in a cross section along the traveling direction X at the center in the width direction of the road 100. is there. 4A and 4B, it is assumed that the irradiation angle θ takes a positive value on the counter beam side.
Specifically, the symmetric beam unit 31 illuminates an elliptical range that covers the entire width of the road 100 as the symmetric beam illumination area LA1 in a range where the irradiation angle θ is approximately ± 70 °. Yes. In this case, the symmetric beam illumination area LA1 has the lowest luminous intensity at the irradiation angle θ of about 0 °, the highest luminous intensity at each irradiation angle θ of about ± 70 °, and the + It has a luminous intensity distribution that is almost symmetrical between the side and the negative side.

On the other hand, the counter beam unit 32 illuminates the road 100 by the counter beam illumination method, and mainly illuminates the counter beam illumination area LA2 on the counter beam side of the road surface as shown in FIG. .
More specifically, as shown in FIG. 4B, the counter beam portion 32 is a counter beam illumination area LA2, and has an irradiation angle θ in a range between about 70 ° and about −50 °. Illuminates an elliptical area that spans almost the entire width. The counter beam illumination area LA2 at this time has the lowest luminous intensity at an irradiation angle θ of about −50 °, the highest luminous intensity at an irradiation angle θ of about 70 °, and an increase in the irradiation angle θ. Along with this, it has a luminous intensity distribution that rises steeply in the vicinity of about 70 °.

Further, as shown in FIG. 3B, the counter beam portion 32 is inclined so that the light emitting surface 30a faces obliquely downward on the counter beam side. Specifically, the light emitting surface 30a of the counter beam portion 32 is inclined obliquely toward the counter beam side, and the inclination angle of the symmetric beam portion 31 facing downward with respect to the light emitting surface 30a is 5 ° to 30 °. Preferably there is.
As described above, since the road illumination lamp 1 is inclined in the width direction of the road 100 following the boom 121 of the pole 120 (see FIG. 2), the light emitting surface 30a of the symmetric beam portion 31 has a horizontal plane on the boom 121. And substantially coincides with the surface inclined in the width direction of the road 100. That is, the light emitting surface 30 a of the counter beam portion 32 is inclined obliquely toward the counter beam side with reference to the surface inclined in the width direction of the road 100.
In this way, by inclining the light emitting surface 30a of the counter beam portion 32 toward the counter beam side, it becomes easier to illuminate the counter beam illumination area LA2 that is the illumination target with more direct light. Therefore, it is not necessary to use an expensive high refractive index material capable of obtaining a strong refraction angle for the light distribution control lens of the light source unit 30, and the cost of the counter beam unit 32 can be reduced.

As shown in FIG. 1, the road illumination lamp 1 according to the present embodiment is an illumination in which the symmetric beam illumination area LA1 and the counter beam illumination area LA2 by the two illumination modules 3 and 3 described above are superimposed on the road surface of the road 100. The area LA is illuminated. Therefore, in this illumination area LA, the amount of light on the counter beam side is larger than that on the pro beam side. That is, the road illumination lamp 1 illuminates the road 100 so that the counter beam side light amount irradiated on the road surface on the counter beam side is larger than the pro beam side light amount irradiated on the road surface on the pro beam side. .
In the present embodiment, about 75% of the total irradiation light amount of the road illumination lamp 1 is the counter beam side light amount, and the remaining about 25% is the pro beam side light amount. The light amount ratio is not particularly limited as long as the counter beam side light amount is larger than the pro beam side light amount, but the counter beam side light amount is preferably 1.5 times or more of the pro beam side light amount, and more than 2 times. It is more preferable that

Then, the illumination aspect of the road 100 by the road illumination lamp 1 is demonstrated.
As described above, the road illumination lamp 1 according to the present embodiment is formed by superimposing the symmetric beam illumination area LA1 by the symmetric beam section 31 and the counter beam illumination area LA2 by the counter beam section 32 on the road surface of the road 100. The illumination area LA is illuminated.

  At this time, in the illumination area LA, the amount of light on the counter beam side irradiated on the road surface on the counter beam side is larger than the amount of light on the pro beam side irradiated on the road surface on the pro beam side. As a result, it is possible to reduce useless light that is not reflected to the vehicle C (own vehicle) side and to effectively illuminate the road surface on the counter beam side by that amount, as compared with the conventional case where the amount of light to the pro beam side is large.

Here, if the counter beam side light quantity irradiated from the front toward the vehicle C is simply increased, there is a concern that this light becomes glare light for the driver of the vehicle C.
In this respect, in the road illumination lamp 1 of the present embodiment, since the irradiation angle θ to the counter beam side is up to about 70 ° in both the symmetric beam portion 31 and the counter beam portion 32, the vehicle C is operated. Glare that a person feels can be suppressed.
According to the “LED Road / Lighting Introduction Guidelines (Draft)” (Ministry of Land, Infrastructure, Transport and Tourism, 2011.9), when the driver's viewpoint is 1.5m high, the position of the car that makes this driver feel strong glare In many cases, this is the moment when the foremost lamp is shielded from the top edge of the windshield of the car, and the shading angle due to the top edge of the windshield of the car is 20 ° upward from the driver ’s line of sight (front). ing.
That is, when expressed by the irradiation angle θ of the road illumination lamp 1, light in a range larger than 70 ° (= 90 ° −20 °), for example, 70 ° to 75 °, tends to be strong glare light. Therefore, by setting the irradiation angle θ to about 70 °, the light in the above range, which tends to be strong glare light, is shielded by the upper end of the windshield of the vehicle C, so that glare felt by the driver of the vehicle C is suppressed. Can do.

Moreover, in the road illumination lamp 1 of this embodiment, the light emission area of the light emission surface 30a of the counter beam part 32 which irradiates light toward the vehicle C from the front is 5000 mm < ² > or more. On the other hand, for example, a sodium lamp conventionally used as a road illumination lamp has an output of 250 W, and the light emission area of a discharging arc part is about 50 mm ² .
Therefore, since the light emitting area is significantly increased as compared with the conventional case, the luminance of the light emitting surface 30a can be reduced, and thus the glare felt by the driver of the vehicle C can be further suppressed.

  As described above, according to the road illumination lamp 1 of the present embodiment, the light amount on the counter beam side is greater than the light amount on the pro beam side. It is possible to reduce useless light that is not reflected to the C (own vehicle) side and to effectively illuminate the road surface on the counter beam side. Therefore, it is possible to improve the visibility of obstacles and the road surface brightness while irradiating light more efficiently than in the past.

Further, since the light emitting area of the light emitting surface 30a of the counter beam portion 32 is 5000 mm ² or more, the light emitting area is significantly increased as compared with a conventional sodium lamp or the like, and the luminance of the light emitting surface 30a can be reduced. Therefore, the glare felt by the driver of the vehicle C can be suppressed.

  Then, the modification of the said embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the component similar to the said embodiment, and the description is abbreviate | omitted.

FIG. 5 is a side view of the road illumination lamp 1A in the present modification.
As shown in this figure, the road illumination lamp 1A includes a symmetrical beam portion 31A and a counter beam portion 32A arranged in parallel as two illumination modules 3A and 3A.

Among these, the symmetric beam portion 31A is provided in a portion of the road illumination lamp 1A opposite to the traveling direction X, and other points are configured in the same manner as the symmetric beam portion 31 in the above embodiment. ing. Accordingly, the symmetric beam portion 31A illuminates the symmetric beam illumination area LA1 on the road surface of the road 100.
On the other hand, the counter beam portion 32A is provided in the traveling direction X side portion of the road illumination lamp 1A, and the other points are configured in the same manner as the symmetric beam portion 31A. That is, the counter beam part 32A has the light emitting surface 30a of the light source part 30 facing downward similarly to the light emitting surface 30a of the symmetric beam part 31A.

In addition, the road illumination lamp 1A includes a reflection mirror 4A at a portion closer to the traveling direction X than the counter beam portion 32A.
This reflection mirror 4A converts the light distribution of the counter beam portion 32A, and reflects the light emitted from the counter beam portion 32A to the pro-beam side.
The counter beam illumination area LA2 is illuminated by the light emitted from the counter beam portion 32A to the pro beam side and reflected by the reflecting mirror 4A and the light emitted from the counter beam portion 32A to the counter beam side. It has become.

  As described above, according to the road illumination lamp 1A of the present modification, it is possible to obtain the same effect as that of the road illumination lamp 1 of the above-described embodiment, and the two illumination modules 3A and 3A are similar to each other. The symmetric beam illumination area LA1 and the counter beam illumination area LA2 can be illuminated while using the symmetric beam section 31A and the counter beam section 32A configured as described above. Therefore, the production / management cost of the lighting module 3A can be reduced as compared with the case where two lighting modules 3 and 3 having different configurations are used as in the above embodiment.

  Embodiments to which the present invention can be applied are not limited to the above-described embodiments and modifications thereof, and can be changed as appropriate without departing from the spirit of the present invention.

  For example, in the above embodiment and its modification, the road illumination lamp 1 (1A) includes the symmetric beam portion 31 (31A) and the counter beam portion 32 (32A) as the two illumination modules 3 (3A). The quantity of the illumination module 3 (3A) and its illumination method are not limited to this. For example, instead of the symmetric beam portion 31 (31A) of the two illumination modules 3 (3A), a probeam portion that mainly illuminates the probeam side may be provided, or a single illumination module 3 (3A) may be provided. It is good also as providing only.

  Further, the road illumination lamp 1 (1A) is attached to the pole 120. However, the road illumination lamp according to the present invention is limited to that attached to the pole (post) as long as it can illuminate the road from above. For example, it may be fixed to a wall surface or ceiling in the tunnel.

  Moreover, although the road illumination lamp 1 (1A) was provided with several LED, the light source of the road illumination lamp which concerns on this invention is not limited to LED (light emitting diode).

  Further, although the road 100 is a three-lane highway, the road illuminated by the road illumination lamp according to the present invention is one lane if the vehicle travels along a predetermined traveling direction. Or two lanes or a general road.

DESCRIPTION OF SYMBOLS 1,1A Road illumination lamp 3,3A Illumination module 30 Light source part 30a Light emission surface 31,31A Symmetric beam part 32,32A Counter beam part 4A Reflection mirror 100 Road C Vehicle X Traveling direction LA Illumination area LA1 Symmetric beam illumination area LA2 Counter beam Lighting area P Lamp position θ Irradiation angle

Claims (6)

A road illumination lamp that illuminates a road on which a vehicle travels along a predetermined traveling direction from above,
While irradiating light on the pro-beam side in the traveling direction side of the lamp position and the counter beam side on the opposite side of the traveling direction from the position of the lamp,
A road illumination lamp characterized in that a counter beam side light amount irradiated on the counter beam side road surface is larger than a pro beam side light amount irradiated on the pro beam side road surface. A counter beam part that mainly illuminates the road surface on the counter beam side,
The road illumination lamp according to claim 1, wherein a light emission area of the counter beam portion is 5000 mm ² or more. As two illumination modules that illuminate different areas in the traveling direction,
A symmetrical beam portion that illuminates the road surface below the lamp so as to be symmetrical between the pro-beam side portion and the counter-beam side portion;
A counter beam portion that mainly illuminates the road surface on the counter beam side;
The road illumination lamp according to claim 1, further comprising:   The road illumination lamp according to claim 3, wherein the counter beam portion is inclined such that a light emitting surface faces obliquely downward on the counter beam side. The symmetric beam portion and the counter beam portion are arranged side by side with their light emitting surfaces facing in the same direction,
4. The road illumination lamp according to claim 3, further comprising a reflection mirror that is disposed in a portion closer to the traveling direction than the counter beam portion and reflects light emitted from the counter beam portion to the pro beam side. .   The road illumination lamp according to any one of claims 1 to 5, wherein the road is an expressway.

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