JP2021051902A - LED road lighting - Google Patents

Abstract

To provide LED road lighting that reduces unnecessary light leaking obliquely upward to reduce dazzling, and also can be installed in a saved space.SOLUTION: LED road lighting 2 is installed at a low position by a road, and has a reflector 5, an LED light emission part 3 which is arranged more on a road side RD2 than the reflector 5, and emits light toward the reflector 5, a housing 4 which has the LED light emission part 3 and reflector 5 inside, a window 40 which is formed on the housing 4 and is opened facing the road side RD2, and a transparent cover 6 which closes the window 40. The reflector 5 is configured to reflect light emitted from the LED light emission part 3 and reflected by the reflector 5 to an irradiation object which is more on the road side RD2 than the housing 4 and below RD5 the housing. In the housing 4, a light shield louver is not arranged between the transparent cover 6 and reflector 5. The transparent cover 6 is in an inclined attitude having a lower end 6a positioned behind RD3 an upper end 6b with the road lighting 2 in an installed state.SELECTED DRAWING: Figure 6

Description

The present invention relates to LED road lighting.

In recent years, in order to install on general roads or highways in places where pole-type road lighting cannot be adopted, LED road lighting that can be illuminated from a low position (road wall balustrade) toward the road side and diagonally downward is being used. It is provided (see Patent Document 1). Since such LED road lighting is installed at a low position, if the unnecessary light directed to the side or diagonally upward increases, the driver will feel dazzling. Therefore, the illuminance at a predetermined measurement position on the side of the road lighting is required to be equal to or less than the specified value.

Patent Document 2 discloses that a light-shielding louver is provided inside a housing having a light source, a reflector, and an opening cover in balustrade lighting using a fluorescent lamp instead of an LED. There is a description that the light flux that goes diagonally upward can be limited by shading the light-shielding louver.

Japanese Unexamined Patent Publication No. 2015-219979 Japanese Unexamined Patent Publication No. 2005-327748

In the LED road lighting described in Patent Document 1, a plate-shaped transparent panel is arranged along the vertical direction in the opening of the fixture main body having a light source and a reflecting portion inside. However, although not described in Patent Document 1, in this configuration, when the light from the light source is reflected by the reflecting portion toward the road to be irradiated on the road side and below, the transparent panel is directed diagonally downward. It was found that a part of the light incident on the light was reflected by the transparent panel and returned to the reflecting part, turned at the reflecting part, passed diagonally upward through the transparent panel, and became unnecessary light.

As one of the effective means for suppressing or preventing the generation of such unnecessary light, as described in Patent Document 2, a light-shielding louver is provided inside the main body of the appliance.

However, when the light-shielding louver is provided inside the main body of the fixture, the main body of the fixture becomes large and cannot be arranged in a limited space such as a wall balustrade where a sound insulation wall is installed.

The present invention provides LED road lighting that can be installed in a small space while reducing unnecessary light leaking diagonally upward to reduce glare.

The LED road illumination of the present invention is a road illumination installed at a low position on the side of the road, and is an LED that is arranged on the road side of the reflector and irradiates light toward the reflector. A light emitting unit, a housing having the LED light emitting unit and the reflecting mirror inside, a window formed in the housing and opening toward the road side, and a transparent cover for closing the window are provided. The reflector is configured to reflect the light emitted from the LED light emitting portion and reflected by the reflector to the irradiation target on the road side and below the housing, and the transparent cover and the transparent cover in the housing. No light-shielding louver is arranged between the reflectors, and the transparent cover is in an inclined posture in which the lower end is located behind the upper end in the installed state of the road lighting.

It is set to irradiate light toward the irradiation target on the road side and below the housing, and when the transparent cover is in a vertical posture along the vertical direction, it is incident on the transparent cover diagonally downward. The light is reflected by the transparent cover, turned by the reflector, and unnecessary light is generated that passes through the transparent cover diagonally upward. This unnecessary light is dazzling for the driver.
When the transparent cover is in an inclined posture in which the lower end is located behind the upper end, the incident angle of light reaching the transparent cover diagonally downward approaches 0 degrees as compared with the case where the transparent cover is in the vertical posture. The closer the incident angle is to 0 degrees, the less the amount of light reflected by the transparent cover and becomes unnecessary light. Therefore, it is possible to suppress unnecessary light leaking diagonally upward and reduce glare.
Nevertheless, since the light-shielding louver is not arranged between the transparent cover and the reflector in the housing, the width of the housing can be reduced and the space can be saved.

A schematic diagram of the installation state of the road lighting of the present embodiment from the driver of a vehicle traveling in the lane of the road. Schematic plan view showing the positional relationship between the road and road lighting A diagram showing structures such as wall railings in the crossing direction of a road, road lighting, and the first and second traveling lanes to be irradiated. Front view of road lighting of this embodiment Side view of road lighting of this embodiment Sectional sectional view of AA part in FIG. 6 of road lighting of this embodiment Sectional view corresponding to FIG. 6 of road lighting of comparative example Cross-sectional view showing a modified example different from the embodiment shown in FIG. Enlarged perspective view showing the vicinity of the road lighting window

The present embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of the installation state of the road lighting 2 from the driver of a vehicle traveling in the lane of the road. FIG. 2 is a schematic plan view showing the positional relationship between the road and the road lighting 2. FIG. 3 is a diagram showing a structure such as a wall railing column 11 in a crossing direction of a road, road lighting 2, and first and second traveling lanes to be irradiated. As shown in FIGS. 1 to 3, a plurality of LED road lights 2 are arranged at low positions on the side of the road 10 at intervals along the traveling direction RD1 of the road. As shown in the figure, the road lighting 2 is installed on the upper part of a structure such as a wall railing 11 arranged on the side of the road 10. The low position means that the vehicle is installed on an installation surface of 1 m or more and 2 m or less from the road surface 12 (traffic zone) on which the vehicle travels. It may be 1 m or more and 1.5 m or less. In the present embodiment, it is installed on the wall height column 11 having a height of 1 m from the road surface 12. In the present embodiment, the irradiation target is set to the nearest first traveling lane and the second traveling lane adjacent to the first traveling lane, but the irradiation target is not limited to this. For example, only the first traveling lane may be the irradiation target, or the first to third traveling lanes may be the irradiation target. In any case, the upper limit of the irradiation range in the transverse direction shown in FIG. 3 is a downward inclination angle θ1 with respect to the horizontal direction of 5 degrees. The inclination angle θ1 ≧ 5. In terms of the angle with respect to the vertical direction, the upper limit is 85 degrees.

Since the road illumination 2 is arranged at a low position, from the side of the road surface 12 to the road surface 12 (traffic zone or lane) with the crossing direction orthogonal to the traveling direction RD1 as the main direction in the plan view shown in FIG. It is configured to illuminate the road surface 12 toward the road surface 12. In addition, in FIG. 1 and FIG. 2, the road illumination 2 is arranged on the left side in the traveling direction RD1, but the present invention is not limited to this. For example, the road lighting 2 may be arranged on the right side in the traveling direction RD1.

FIG. 4 is a front view of the road lighting 2. FIG. 5 is a side view of the road lighting 2. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 6 of the road lighting 2. FIG. 6 schematically shows the path of light inside the housing of the road lighting 2. As shown in FIGS. 4 and 6, the road illumination 2 is a housing having an LED light emitting unit 3, a reflector 5 arranged behind the LED light emitting unit 3 and a reflector 5, an LED light emitting unit 3 and a reflecting mirror 5 inside. It has a body 4, a window 40 formed in the housing 4 and opening toward the road side LED 2, and a transparent cover 6 for closing the window 40.

In the present embodiment, as shown in FIG. 5, the installation location of the road lighting 2 is the top surface of the wall railing column 11. Since the support column 11a of the sound insulation wall is arranged on the top surface of the wall balustrade 11, it is arranged in the remaining space. In this embodiment, the width W1 of the housing 4 is set to 60 mm or less. This is because when the width of the wall height column 11 is 250 mm and the width of the support column 11a is 125 mm, there is only (250-125) / 2 = 62.5 mm of installation space on the side of the support column 11a. is there. Of course, the embodiment shown in FIG. 5 is an example, and is not limited to the above dimensions. It is assumed that the installation surface (top surface) of the wall balustrade 11 on which the road lighting 2 is installed is horizontal, but it may not be horizontal due to construction errors and other factors. In order to deal with such a case, the support portion 2a (aiming) that supports the housing 4 is configured so that the angle can be adjusted.

The window 40 releases the light emitted by the LED light emitting unit 3 from the inside of the housing 4 toward the irradiation target of the road side RD2 and the lower RD5. In the present embodiment, the housing 4 includes a housing main body 41 that houses the LED light emitting unit 3 and the reflector 5, a maintenance opening 42 that is formed in the housing main body 41 and enables access to the inside, and a maintenance opening. It has a door portion 43 configured to close or open the 42. The housing 4 is formed in a long box shape extending in the traveling direction RD1, but the shape of the housing 4 can be changed in various ways. Further, in the present embodiment, the housing 4 is box-shaped, but the housing 4 is not limited to this.

The LED light emitting unit 3 is provided with a plurality of LED elements (not shown) arranged along the traveling direction RD1 and a straight line corresponding to each LED element and transmitting the light of each LED element along the traveling direction RD1. It has a lens (not shown) that converts light into linear light. With this configuration, the LED light emitting unit 3 is configured to be able to irradiate linear light that does not spread in the vertical direction but spreads in the traveling direction RD1. This is because the first traveling lane and the second traveling lane, which are the irradiation targets, have a long shape in the traveling direction RD1 and are adapted to this shape. The LED light emitting unit 3 irradiates light in the main irradiation direction L1 according to its posture. The light traveling along the main irradiation direction L1 is reflected by the reflecting mirror 5, travels along the path L2 based on the main irradiation direction L1, and is incident on the transparent cover 6. The reflector 5 irradiates the light incident from the LED light emitting unit 3 along the main irradiation direction L1 on the road side RD2 and the lower RD5 with respect to the housing 4 (in the present embodiment, the first traveling lane and the second traveling). It is configured to reflect towards the lane).

The transparent cover 6 is a plate-shaped member and transmits light. The transparent cover 6 is provided to prevent rain from entering the inside of the housing 4 from the outside. In the present embodiment, it is made of glass, but the material can be changed as appropriate. The transparent cover 6 is attached to the door portion 43. The door portion 43 is rotatably supported by the housing body 41 via the hinge portion 43a. The door portion 43 of the present embodiment is made of metal and has a light-shielding property, but is not limited thereto. A packing 46 is provided between the door portion 43 and the housing body 41 to prevent rain from entering the inside of the housing 4.

FIG. 7 shows a comparative example. As shown in FIG. 7, when the transparent cover 6 is arranged so as to be parallel to the vertical direction (vertical direction), a part of the light incident on the transparent cover 6 along the path L2 is directed to the transparent cover 6. Since the incident angle is not 0 degrees, it is reflected by the transparent cover 6 and reaches the reflector 5, and the reflector 5 does not need to be radiated diagonally upward from the housing 4 by changing the direction to the road side RD2 and upward. It turned out to be light L3.

Therefore, in order to reduce the unnecessary light L3 shown in FIG. 7, in the embodiment shown in FIG. 6, the transparent cover 6 is in an inclined posture in which the lower end 6a is located behind the upper end 6b in the RD3 in the installed state of the road lighting 2. ing. If the posture of the transparent cover 6 is tilted, the angle of incidence of the light along the path L2 from the reflector 5 on the road side RD2 and diagonally downward of the downward RD 5 with respect to the transparent cover 6 is such that the transparent cover 6 is vertical. It can be closer to 0 degrees than in the posture. In the embodiment of FIG. 6, the incident angle of the light emitted from the LED light emitting unit 3 along the main irradiation direction L1 and reflected by the reflector 5 and passing through the path L2 to the transparent cover 6 with respect to the transparent cover 6 is 0 degrees. It is set as. By setting this angle, the light reflected by the transparent cover 6 can be remarkably eliminated, and unnecessary light can be reduced or eliminated.

Of course, the incident angle is preferably 0 degrees, but as shown in FIG. 8, the incident angle θ2 does not have to be 0 degrees. When the transparent cover 6 is made of glass, the critical angle of the glass is 45 degrees, so that the incident angle θ2 of the light passing through the path L2 is preferably 0 degrees or more and less than 45 degrees. This is to prevent total reflection when the angle of incidence exceeds the critical angle of the glass.

In the embodiment shown in FIG. 8, the incident angle θ2 is preferably 0 degrees or more and 5 degrees or less. Further, the incident angle θ2 is preferably 0 degrees or more and 2 degrees or less. This is because the amount of light reflected by the transparent cover 6 can be reduced. Nevertheless, the light reflected by the transparent cover 6 returns to the vicinity of the intersection P1 between the main irradiation direction L1 and the reflector 5, passes near the path along the main irradiation direction L1 again, and does not go out. As a result, unnecessary light can be reduced.

In the embodiment shown in FIG. 6 or 8, the light-shielding louver is not arranged between the transparent cover 6 and the reflector 5 in the housing 4. As a result, the housing 4 can be miniaturized. Of course, in the embodiment shown in FIG. 6 or 8, unnecessary light is reduced or eliminated depending on the relationship between the posture of the transparent cover 6 and the path L2. Therefore, although it is meaningless, a light-shielding louver is provided outside the housing 4. It is not an exclusion.

FIG. 9 is an enlarged perspective view showing the vicinity of the window 40 of the road lighting 2 in an enlarged manner. As shown in FIGS. 4, 6 and 9, the door portion 43 has a front outer surface 44 that blocks light and a recess 45 that is recessed from the front outer surface 44. A window 40 is formed at the bottom of the recess 45. With this configuration, it is difficult for rain to hit the transparent cover 6. In the present embodiment, the front outer surface 44 is a flat surface, but may be a curved surface.

The recess 45 has a peripheral edge portion 45a forming the window 40 and a connecting surface 45b connecting the peripheral edge portion 45a and the front outer surface 44. The connecting surface 45b connects the bottom of the recess 45 and the front outer surface 44. When the light that hits the connecting surface 45b is reflected and heads in a specific direction, it causes a feeling of glare. Therefore, it is preferable that the connecting surface 45b is black or provided with a reflection diffusing material. In particular, when there is a connecting surface 45b that stands up on the traveling direction RD1 side or the upstream side RD4 among the plurality of connecting surfaces 45b, the standing connecting surface 45b is black or provided with a reflection diffusing material. Is preferable. This is because these connecting surfaces 45b are upright, and if light is reflected, there is a high possibility that the driver will be dazzled. If it is black, light is absorbed. The reflective diffusing material requires both a reflective function and a diffusing function. This is because if only the reflection function is used, the light that reaches the driver gathers too much and is dazzling.

As described above, the LED road illumination 2 of the present embodiment is the road illumination 2 installed at a low position on the side of the road 10, and is arranged and reflected on the reflector 5 and the RD2 on the road side of the reflector 5. An LED light emitting unit 3 that irradiates light toward the mirror 5, a housing 4 that has the LED light emitting unit 3 and a reflecting mirror 5 inside, and a window 40 that is formed in the housing 4 and opens toward the road side RD2. A transparent cover 6 for closing the window 40 is provided, and the reflector 5 reflects the light emitted from the LED light emitting unit 3 and reflected by the reflector 5 to the irradiation target of the road side RD2 and the lower RD5 of the housing 4. No light-shielding louver is arranged between the transparent cover 6 and the reflector 5 in the housing 4, and the lower end 6a of the transparent cover 6 is the upper end in the installed state of the road lighting 2. It is an inclined posture located at RD3 behind 6b.

It is set to irradiate light toward the irradiation target of the road side RD2 and the lower RD5 of the housing 4, and when the transparent cover 6 is in a vertical posture along the vertical direction, it is transparent diagonally downward. It enters the cover 6 and is reflected by the transparent cover, is turned by the reflector 5, and unnecessary light passing through the transparent cover 6 is generated diagonally upward. This unnecessary light is dazzling for the driver.
If the transparent cover 6 is in an inclined posture in which the lower end 6a is located behind the upper end 6b in the RD3 as in the present embodiment, the incident angle θ2 of the light reaching the transparent cover 6 diagonally downward is set by the transparent cover 6. It approaches 0 degrees compared to the case of vertical posture. The closer the incident angle θ2 is to 0 degrees, the less the amount of light reflected by the transparent cover 6 becomes unnecessary light. Therefore, it is possible to suppress unnecessary light leaking diagonally upward and reduce glare.
Nevertheless, since the light-shielding louver is not arranged between the transparent cover 6 and the reflector 5 in the housing 4, the width of the housing 4 can be reduced and the housing 4 can be installed in a small space.

As in the present embodiment, the transparent cover 6 is made of glass, and the LED light emitting unit 3 is configured to irradiate light along the main irradiation direction L1, from the LED light emitting unit 3 to the main irradiation direction L1. It is preferable that the incident angle θ2 of the light irradiated along the path L2, which is reflected by the reflector 5 and reaches the transparent cover 6, is 0 degrees or more and less than 45 degrees.

In this way, the incident angle θ2 of the light emitted along the main irradiation direction L1 of the LED light emitting unit 3 and reaching the glass transparent cover 6 is 0 degrees or more and less than 45 degrees, so that the incident angle θ2 is the glass. It is possible to reduce glare by suppressing unnecessary light leaking diagonally upward while avoiding total internal reflection when the angle exceeds the critical angle.

As in the present embodiment, the LED light emitting unit 3 is configured to irradiate light along the main irradiation direction L1, is irradiated from the LED light emitting unit 3 along the main irradiation direction L1, and is reflected by the reflector 5. The incident angle θ2 of the light passing through the path L2 leading to the transparent cover 6 is preferably 0 degrees or more and 5 degrees or less.

As described above, when the incident angle θ2 of the light of the path L2 reaching the transparent cover 6 along the main irradiation direction L1 of the LED light emitting unit 3 is 0 degrees or more and 5 degrees or less, the light reflected by the transparent cover 6 The amount can be reduced. Nevertheless, the light reflected by the transparent cover 6 returns to the vicinity of the intersection P1 between the main irradiation direction L1 and the reflector 5, passes near the path along the main irradiation direction L1 again, and does not go out, so that it is oblique. It is possible to reduce glare by suppressing unnecessary light leaking upward.

As in the present embodiment, the housing 4 includes a housing body 41 that houses the LED light emitting unit 3 and the reflecting mirror 5, a maintenance opening 42 that is formed in the housing body 41 and enables access to the inside. The maintenance opening 42 has a door portion 43 configured to be closed or openable, and the door portion 43 has a front outer surface 44 and a recess 45 recessed from the front outer surface 44, and the recess 45 has a recess 45. It is preferable that the window 40 is formed on the bottom.

According to this configuration, the inside of the housing body 41 can be accessed through the maintenance opening 42 by opening and closing the door portion 43, so that the maintenance of the LED light emitting portion 3, the reflector 5, or the transparent cover 6 becomes easy. Nevertheless, since the window 40 closed by the transparent cover 6 is formed at the bottom of the recess 45 provided in the front outer surface 44 constituting the door portion 43, it is difficult for rain to hit the transparent cover 6, and the transparent cover 6 is prevented from hitting the transparent cover 6. It is possible to suppress the dirt from being soiled, and it is possible to reduce or eliminate the maintenance work for cleaning.

As in the present embodiment, the connecting surface 45b connecting the front outer surface 44 and the bottom of the recess 45 is preferably black or provided with a reflection diffusing material.

According to this configuration, even if light hits the connecting surface 45b connecting the front outer surface 44 and the bottom of the recess 45, it is absorbed in black or diffusely reflected by the reflection diffuser, so that the light is emitted in a specific direction. It is possible to suppress the feeling of concentration and glare.

It is possible to adopt the structure adopted in each of the above embodiments in any other embodiment. The present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the spirit of the present invention.

2 LED road lighting 3 LED light emitting part 4 housing 40 window 41 housing body 42 maintenance opening 43 door part 44 front outer surface 45 recess 45b connection surface 5 reflector 6 transparent cover 6a lower end of transparent cover 6b upper end of transparent cover L1 main Irradiation direction L2 Path θ2 Incident angle RD2 Road side RD3 Rear RD5 Down

Claims (5)

Road illumination installed at a low position on the side of the road, a reflector, an LED light emitting unit arranged on the road side of the reflector and irradiating light toward the reflector, and the LED light emitting unit. A housing having the reflector inside, a window formed in the housing and opened toward the road side, and a transparent cover for closing the window.
The reflector is configured to reflect the light emitted from the LED light emitting portion and reflected by the reflector to the irradiation target on the road side and below the housing.
No light-shielding louver is arranged between the transparent cover and the reflector in the housing.
The transparent cover is an LED road lighting having an inclined posture in which the lower end is located behind the upper end in the installed state of the road lighting. The transparent cover is made of glass
The LED light emitting unit is configured to irradiate light along the main irradiation direction.
The first aspect of claim 1, wherein the incident angle of the light emitted from the LED light emitting unit along the main irradiation direction, reflected by the reflector, and passing through the path to the transparent cover is 0 degrees or more and less than 45 degrees. LED road lighting. The LED light emitting unit is configured to irradiate light along the main irradiation direction.
According to claim 1 or 2, the incident angle of light emitted from the LED light emitting unit along the main irradiation direction, reflected by the reflector, and passing through the path to the transparent cover is 0 degrees or more and 5 degrees or less. The LED road lighting described. The housing can close or open a housing body that houses the LED light emitting portion and the reflector, a maintenance opening that is formed in the housing body and enables access to the inside, and the maintenance opening. It has a configured door and
The door portion has a front outer surface and a recess recessed from the front outer surface.
The LED road lighting according to any one of claims 1 to 3, wherein the window is formed at the bottom of the recess. The LED road lighting according to claim 4, wherein the connecting surface connecting the front outer surface and the bottom of the recess is black or provided with a reflective diffuser.

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