JP2018206704A - Road lighting fixture - Google Patents

Abstract

To suppress upward light distribution while achieving miniaturization of a lighting fixture, in a road lighting fixture for illuminating a road surface of a road from a lateral side of the road surface.SOLUTION: A road lighting fixture 1 illuminates a near region NR and a far region FR constituting a road surface RS from the lateral side of the road surface RS of a road RD. The road lighting fixture 1 includes: a housing 2 having openings O1, O2; a translucent panel 9 arranged so as to close the openings O1, O2; and a light source 3, a light source 4, a reflection mirror 5 and a reflection mirror 6 arranged in the housing 2. The light sources 3, 4 comprise a plurality of LEDs 11, and the light source 4 is arranged further downward than the light source 3. The reflection mirror 5 reflects the light emitted from the light source 3 toward the near region NR and radiates it to the near region NR through the panel 9. The reflection mirror 6 is arranged further downward than the reflection mirror 5, and reflects the light emitted from the light source 4 toward the far region FR and radiates it to the far region FR through the panel 9.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a road illumination fixture of a low position illumination system that illuminates a road surface of a road from the side of the road surface.

  As a conventional low-position illumination type road lighting apparatus, there is one disclosed in Patent Document 1. This road lighting device includes a housing, a linear light source, a reflecting mirror, a front panel made of a translucent acrylic resin, and a plurality of louvers as attenuation parts. The front panel is disposed on the front side of the linear light source so as to block the front surface of the housing, and transmits a part of the reflected light from the reflecting mirror and reflects a part thereof. The plurality of louvers block light that has been reflected a plurality of times within the housing, such as reflected light from the front panel, and suppress light that leaks upward from the horizontal (hereinafter also referred to as “upward light distribution”). Therefore, according to this road luminaire, the plurality of louvers can suppress and attenuate the secondary reflected light from the front panel from leaking upward from the horizontal.

JP 2011-146374 A

  By the way, in the road lighting fixtures of the low position lighting system, the restriction on the upward light distribution has been becoming increasingly strict in recent years. In addition, with the progress of miniaturization of road lighting equipment, it is becoming difficult to secure a louver installation space inside the equipment.

  This indication is made in view of the subject which such a prior art has. An object of the present disclosure is to suppress upward light distribution while reducing the size of a device in a road lighting device that illuminates a road surface from the side of the road surface.

  One aspect of the present disclosure is a road lighting device that illuminates a first region constituting a road surface and a second region located farther than the first region from the side of the road surface of the road. A road lighting device includes a housing having a light projection opening, a translucent panel disposed so as to close the light projection opening, a first linear light source, a second linear light source disposed in the housing, A first reflecting mirror and a second reflecting mirror are included. The first and second linear light sources include a plurality of light emitting elements, and the second linear light source is disposed below the first linear light source. The first reflecting mirror reflects the light emitted from the first linear light source toward one of the first region and the second region, and irradiates one region through the panel. The second reflecting mirror is disposed below the first reflecting mirror, reflects light emitted from the second linear light source toward the other of the first region and the second region, and passes through the panel. Irradiate the other area.

  According to the present disclosure, in a road lighting device that illuminates a road surface from the side of the road surface, it is possible to suppress upward light distribution while reducing the size of the device.

It is an arrangement plan of a road lighting fixture concerning an embodiment of this indication. It is an external view of the road lighting fixture concerning embodiment of this indication, (a) is a front view and (b) is a side view. It is a cross-sectional view along the AA line of Fig.2 (a). It is a principal part cross-sectional view of the road lighting fixture concerning a comparative example.

  Hereinafter, a road lighting device 1 according to an embodiment of the present disclosure will be described with reference to the drawings. It should be noted that the terms representing directions such as “up”, “down”, “front”, “rear”, etc. are defined for convenience in order to describe the positional relationship between the respective parts, and do not limit the mounting posture or the like of the actual instrument. .

  As shown in FIG. 1, the road lighting device 1 is a low-position lighting type road lighting device that illuminates the road surface RS of a four-lane road RD from the side, for example, and is provided on the side of the road surface RS. It is installed on the railings and side walls.

  As shown in FIG. 2A, the road lighting device 1 has a long shape, and is typically at a relatively low position where the height from the road surface RS is about 1.0 to 1.2 m. The position is fixed so that the longitudinal direction thereof is substantially parallel to the road surface RS. Therefore, an excellent guiding effect can be exhibited by arranging a plurality of road lighting devices 1 continuously along the extending direction of the road RD.

  As shown in FIG. 1, the illumination light IL of the road lighting device 1 is irradiated from one side (left side) of the road surface RS to the opposite side (right side) and downward, and enters the road surface RS obliquely. The illumination light IL is distributed so as to obtain desired average road surface brightness, overall uniformity, and lane axis uniformity on the road surface RS that is the surface to be illuminated.

  As shown in FIG. 1, the road surface RS that is an illuminated surface includes a near area NR (first area) located near the road lighting apparatus 1 in the irradiation direction of the illumination light IL, and a road lighting apparatus from the near area NR. And a far region FR (second region) located at a position away from 1. The near region NR and the far region FR are arranged in the road width direction, and a part of the near region NR on the far side in the irradiation direction overlaps with a part on the far side in the irradiation direction of the far region FR.

  In the example of FIG. 1, the left road side band LM, the first lane L1, the second lane L2, the third lane L3, the fourth lane L4, and the right road side band RM constitute the entire road surface RS. Of these, the vicinity from the left end of the left side road belt LM to the vicinity of the center line of the third lane L3 is in the near area NR, and the vicinity of the center line of the first lane L1 to the vicinity of the right edge of the right side road band RM is the far area FR. Is set. Note that the ranges and positional relationships of the regions NR and FR are not limited to the above. For example, the near region NR and the far region FR do not have to overlap each other.

  As shown in FIGS. 2 and 3, the road lighting device 1 includes a housing 2, an upper linear light source 3 (first linear light source), and a lower linear light source 4 (first linear light source) disposed in the housing 2. A two-line light source), an upper reflecting mirror 5 (first reflecting mirror), and a lower reflecting mirror 6 (second reflecting mirror). (Hereinafter, the upper linear light source 3, the lower linear light source 4, the upper reflecting mirror 5, and the lower reflecting mirror 6 may be abbreviated as the light source 3, the light source 4, the reflecting mirror 5, and the reflecting mirror 6, respectively.)

  The housing 2 includes a main body 21 having an opening 21a that is open toward the road RD side (hereinafter referred to as the front), and a front panel 22 that is disposed so as to close the opening 21a. The main body 21 and the front panel 22 are formed from a thin metal plate such as an aluminum extruded material or stainless steel. As shown in FIG. 3, the main body 21 has a substantially U-shaped cross section opened forward in a cross section perpendicular to the longitudinal direction of the road lighting device 1. The front panel 22 is attached to the peripheral edge of the opening 21a of the main body 21 by screws or the like (not shown).

  A housing space S surrounded by the main body 21 and the front panel 22 is provided inside the housing 2. In the accommodation space S, the light source 3, the light source 4, the reflecting mirror 5, and the reflecting mirror 6 are accommodated. The light source 3 and the reflecting mirror 5 are disposed above the light source 4 and the reflecting mirror 6, respectively. Further, in the accommodation space S, a power supply unit 7 (see FIG. 2A) made up of electronic components and the like for supplying power to the LED 11 described later is accommodated. Although the cross-sectional dimension of the housing | casing 2 in a cross section perpendicular | vertical to the longitudinal direction of the road lighting fixture 1 is not specifically limited, For reasons, such as restrictions of installation space, it is 250 mm or less in height and 60 mm or less in width.

  As shown in FIG. 2A, an attachment fitting 8 </ b> A for fixing the road lighting device 1 to the side wall of the road RD is fixed to the lower side wall of the main body 21. The mounting bracket 8A is fixed to the mounting bracket 8B on the road RD side with fasteners such as bolts and nuts. As shown in FIG. 2B, the housing 2 can be fixed in a state where it is tilted back and forth around the attachment point C of the attachment fittings 8A and 8B.

  The front panel 22 is provided with an upper light projecting opening O1 and a lower light projecting opening O2 arranged in the vertical direction. Each of the upper light projecting opening O1 and the lower light projecting opening O2 has a long rectangular shape along the longitudinal direction of the road lighting device 1. (Hereinafter, the upper light projecting opening O1 and the lower light projecting opening O2 may be abbreviated as the opening O1 and the opening O2, respectively.)

  A translucent panel 9 made of, for example, tempered glass is attached to the back surface of the front panel 22. The panel 9 is disposed so as to block both the openings O1 and O2. The outer peripheral portion of the panel 9 is fixed to the front panel 22 by a fixing bracket 23, a nut 24, and the like. The material of the panel 9 is not particularly limited, and includes a tempered glass, an acrylic resin, a polycarbonate resin, a silicon resin, a polyolefin resin, and the like. Transparent material can be used.

  Each of the light sources 3 and 4 includes a plurality of light emitting diodes 11 (hereinafter referred to as LEDs) mounted on the substrate 10. The plurality of LEDs 11 are arranged along the longitudinal direction of the road lighting device 1. The board 10 is supported by a bracket 12 fixed to the rear side wall of the housing 2 in a posture in which the surface on which the plurality of LEDs 11 are mounted faces rearward (opposite the road RD side) and downward. Therefore, the optical axis of the LED 11 extends obliquely backward and downward. The substrate 10, the LED 11, and the bracket 12 of this embodiment are common between the light sources 3 and 4, and parts are shared.

  The reflecting mirror 5 extends along the longitudinal direction of the road lighting device 1 (the direction in which the light source 3 extends), and is supported by a bracket 13 fixed to the rear side wall of the housing 2. The surface of the reflecting mirror 5 on the light source 3 side is provided with a mirror reflecting surface 5a, and the upper end 5b thereof is located at substantially the same height as the LED 11 of the light source 3 above the upper peripheral edge O1a of the opening O1. ing. The lower part of the specular reflection surface 5a extends to the vicinity of the back surface of the panel 9, and the lower end 5c thereof is positioned in front of the LED 11 of the light source 3 and above the lower peripheral edge O1b of the opening O1. Yes. The specular reflection surface 5 a has a substantially parabolic shape that is smoothly curved from the upper end 5 b to the lower end 5 c in a cross section perpendicular to the longitudinal direction of the road lighting device 1.

  The reflecting mirror 5 primarily reflects the light emitted from the light source 3 toward the near region NR and irradiates the near region NR with the primary reflected light through the panel 9. The emission direction of the primary reflected light is controlled by the shape of the specular reflection surface 5a. Of the light emitted from the LED 11 of the light source 3, the light R1 emitted in the optical axis direction is primarily reflected by the specular reflection surface 5a, and then passes through the upper part of the opening O1, that is, the vicinity of the upper peripheral edge O1a of the opening O1. The light is applied to the far part of the near region NR. Lights R2 and R3 emitted from the LED 11 of the light source 3 upward or downward from the optical axis and primarily reflected near the upper end 5b or the lower end 5c of the specular reflection surface 5a are below the opening O1, that is, the opening. It passes near the lower peripheral edge O1b of O1. Lights R2 and R3 that have passed through the lower portion of the opening O1 are applied to the near part of the near region NR.

  The reflecting mirror 6 extends along the longitudinal direction of the road lighting device 1 (the extending direction of the light source 4), and is supported by a bracket 14 fixed to the rear side wall of the housing 2. A mirror reflecting surface 6a is provided on the surface of the reflecting mirror 6 on the light source 4 side, and an upper end 6b of the reflecting mirror 6 is located at substantially the same height as the LED 11 of the light source 4 above the upper peripheral edge O2a of the opening O2. ing. The lower part of the specular reflection surface 6a extends to the vicinity of the back surface of the panel 9, and the lower end 6c thereof is located in front of the LED 11 of the light source 4 and above the lower peripheral edge O2b of the opening O2. Yes. The specular reflection surface 6 a has a substantially parabolic shape that is smoothly curved from the upper end 6 b to the lower end 6 c in a cross section perpendicular to the longitudinal direction of the road lighting device 1.

  The reflecting mirror 6 primarily reflects the light emitted from the light source 4 toward the far region FR, and irradiates the far region FR through the panel 9 with the primary reflected light. The emission direction of the primary reflected light is controlled by the shape of the specular reflection surface 6a. Of the light emitted from the LED 11 of the light source 4, the light R4 emitted in the optical axis direction is primarily reflected by the specular reflection surface 6a, and then passes through the upper part of the opening O2, that is, the vicinity of the upper peripheral edge O2a of the opening O2. Irradiate the far part of the far region FR. The light R5 emitted from the LED 11 of the light source 4 toward the upper side of the optical axis and primarily reflected in the vicinity of the upper end 6b of the specular reflection surface 6a passes through the upper part of the opening O2 and is irradiated to the far part of the far region FR. The The light R6 emitted from the LED 11 of the light source 4 downward from the optical axis and primarily reflected in the vicinity of the lower end 6c of the specular reflection surface 6a passes through the lower part of the opening O2, that is, the vicinity of the lower peripheral edge O2b of the opening O2. And it irradiates the near part of the far region FR.

  In the road lighting apparatus shown in FIG. 3, the irradiation angle range θ <b> 1 of the primary reflected light from the reflecting mirror 5 is larger than the irradiation angle range θ <b> 2 of the primary reflected light from the reflecting mirror 6. The vertical distance D1 between the lower end 5c of the specular reflection surface 5a and the upper peripheral edge O1a of the opening O1 is smaller than the vertical distance D2 between the lower end 6c of the specular reflection surface 6a and the upper peripheral edge O2a of the opening O2. Note that the irradiation angle range θ2 may be larger than the irradiation angle range θ1.

  The reflecting mirrors 5 and 6 can be formed from a metal such as aluminum or stainless steel, for example. The specular reflecting surfaces 5a and 6a can be formed by applying mirror processing to the surfaces of the reflecting mirrors 5 and 6 on the light source 3 and 4 side, or applying or vapor-depositing a reflecting material.

  A diffusion panel 15 is provided inside the panel 9. The diffusion panel 15 is fixed to the back surface of the front panel 22 together with the panel 9 by a fixing bracket 23 or the like. The diffusion panel 15 is for diffusing the light incident on the panel 9 from the reflecting mirrors 5 and 6 to improve the uniformity on the road surface RS. As the diffusion panel 15, for example, a transparent panel made of acrylic resin having a concavo-convex shape on the surface can be adopted. Note that the diffusion panel 15 may be omitted when sufficient uniformity is obtained by the surface properties of the reflecting mirrors 5 and 6 and the panel 9.

  Hereinafter, the effect of this embodiment is demonstrated, referring the comparative example of FIG.

  The upper light distribution is light that leaks from the light projection opening Ox after being reflected a plurality of times in the housing, and is emitted obliquely upward from the light projection opening Ox. The main component includes tertiary reflected light Rx (see FIG. 4) from the vicinity of the lower end Mc of the reflecting surface Ma. A part of the primary reflected light from the vicinity of the upper end Mb of the reflecting surface Ma is secondarily reflected by the back surface of the panel P, and then enters the vicinity of the lower end Mc of the reflecting surface Ma. The light that has passed through the panel P leaks to the outside through the projection opening Ox.

  The upward light distribution does not contribute to the improvement of the road surface brightness, and may cause glare for the driver of the vehicle traveling on the road, so it is desirable to reduce it. In the low-position lighting type road lighting fixture, for example, there is a case where a restriction (for example, 150 lx or less) is provided on the vertical surface illuminance at a position of 1.2 m on the road surface.

  On the other hand, for example, when illuminating a road having a relatively large number of lanes of three lanes or more, the reflecting surface in a cross section orthogonal to the longitudinal direction of the linear light source LS is used to distribute the illumination light IL over a wide range in the road width direction. It is necessary to make the irradiation angle range θx of the primary reflected light of Ma relatively large. However, if the irradiation angle range θx is expanded, the difference between the inclination angle in the vicinity of the upper end Mb and the inclination angle in the vicinity of the lower end Mc of the reflecting surface Ma increases, and the primary reflected light from the vicinity of the upper end Mb is reflected on the back surface of the panel P. After secondary reflection, it becomes easy to enter the vicinity of the lower end Mc. Thereby, the light quantity of the above-mentioned tertiary reflected light Rx increases, and there exists a possibility that upward light distribution may become strong.

  On the other hand, in the road lighting fixture 1, the reflecting mirror 5 irradiates the primary reflected light toward the near region NR, and the reflecting mirror 6 irradiates the primary reflected light toward the far region FR. , 6 share the irradiation range of the primary reflected light. For this reason, the irradiation angle ranges θ1 and θ2 of the primary reflected light in the reflecting mirrors 5 and 6 are respectively smaller than the irradiation angle range θx of the comparative example of FIG. 4, and the vicinity of the upper ends 5b and 6b of the specular reflection surfaces 5a and 6a. The difference in inclination angle in the vicinity of the lower ends 5c and 6c is also smaller than that of the comparative example. As a result, primary reflected light from the vicinity of the upper ends 5b and 6b of the specular reflection surfaces 5a and 6a is less likely to enter the vicinity of the lower ends 5c and 6c after secondary reflection on the back surface of the panel 9, so that the vicinity of the lower ends 5c and 6c. The increase in the amount of the tertiary reflected light from is suppressed.

  Therefore, according to the road lighting apparatus 1, even when the road surface RS of the road RD having a relatively large number of lanes is illuminated from the side, unnecessary upward light distribution can be suppressed and glare to the driver can be reduced. It becomes possible. In addition, since installation of a louver or the like for shielding the upper light distribution can be omitted, it is possible to reduce the size of the instrument while effectively using the light source light from the light sources 3 and 4.

  Furthermore, in the road lighting device 1, the primary reflected light from the reflecting mirror 5 is applied to the near region NR. For this reason, the vertical distance D1 between the lower end 5c of the specular reflection surface 5a and the upper peripheral edge O1a of the opening O1 is made smaller than when the reflected light is irradiated to the far region FR, and the space in the near region NR is reduced. Light passing through the upper region U (see FIG. 1) can be reduced. Therefore, the vertical surface illuminance at a predetermined height on the near region NR can be reduced, and glare to the driver can be more reliably prevented.

  Moreover, in the road lighting fixture 1, the light source 3 and the light source 4 have the same structure. Accordingly, by replacing the brackets 13 and 14 as appropriate, a reflector for the far region FR that is the same as the reflector 6 is attached to the position of the reflector 5, or for the near region NR that is the same as the reflector 5 at the position of the reflector 6. It is possible to attach a reflecting mirror. By attaching the same reflecting mirror (for either the near region NR or the far region FR) above and below, it is possible to illuminate a narrow road without increasing the number of parts.

  The technical scope of the present disclosure is not limited to the specific technical matters disclosed in the above-described embodiments, but includes various modifications, changes, alternative technologies, and the like that can be easily derived therefrom.

  For example, in the above embodiment, the primary reflected light of the reflecting mirror 5 is applied to the near region NR, and the primary reflected light of the reflecting mirror 6 is applied to the far region FR, but the primary reflected light of the reflecting mirror 5 is applied to the far region. The near region NR may be irradiated with the primary reflected light of the reflecting mirror 6 by irradiating the FR. Even in this case, in each of the reflecting mirrors 5 and 6, the irradiation angle ranges θ1 and θ2 of the primary reflected light in the cross section orthogonal to the longitudinal direction of the light sources 3 and 4 are the irradiation angle ranges of the primary reflected light in the comparative example of FIG. It becomes smaller than θx. For this reason, the light quantity of the tertiary reflected light from lower end 5c, 6c vicinity of the specular reflective surfaces 5a, 6a can be reduced, and upper light distribution can be suppressed.

  Moreover, in the said embodiment, although the group which consists of a light source and a reflective mirror was provided in two steps up and down, the number of steps may be three or more. For example, in the case of three stages, the linear light source and the reflector in the uppermost stage, the lowermost stage, and the intermediate stage between them are respectively the closest area, the farthest area, and the intermediate area between them in the irradiation direction. It can be shared and illuminated. In each reflecting mirror, the irradiation angle range of the primary reflected light in the cross section orthogonal to the longitudinal direction of the linear light source can be further reduced, so that unnecessary upward light distribution can be further suppressed.

  Furthermore, in the said embodiment, although the light emitting element of the light sources 3 and 4 was comprised from the light emitting diode, other semiconductor elements, such as not only this but organic EL (OLED), may be sufficient as a light emitting element.

  As described above, the road lighting device 1 according to the embodiment of the present disclosure is located nearer to the near area NR and the near area NR constituting the road surface RS from the side of the road surface RS of the road RD. This is a road lighting device that illuminates the region FR. The road lighting device 1 includes a housing 2 having openings O1 and O2, and a translucent panel 9 disposed so as to close the openings O1 and O2. The road lighting device 1 includes an upper linear light source 3 including a plurality of LEDs 11 disposed in the housing 2 and a plurality of LEDs 11 disposed below the upper linear light source 3 in the housing 2. The lower linear light source 4 is provided. Further, the road lighting device 1 is disposed in the housing 2 and reflects the light emitted from the upper linear light source 3 toward one of the near region NR and the far region FR, so that the panel 9 An upper reflecting mirror 5 is provided for irradiating the one region through. Further, the road lighting device 1 is disposed below the upper reflecting mirror 5 in the housing 2 and directs the light emitted from the lower linear light source 4 to the other region of the near region NR and the far region FR. And a lower reflecting mirror 6 that irradiates the other region through the panel 9. The one region is preferably a near region NR, and the other region is preferably a far region FR.

RD Road RS Road surface NR Near area (first area)
FR far region (second region)
DESCRIPTION OF SYMBOLS 1 Road lighting fixture 2 Case O1 Upper side light emission opening (light emission opening)
O2 Lower projection aperture (projection aperture)
11 Light-emitting diode (light-emitting element)
3 Upper linear light source (first linear light source)
4 Lower linear light source (second linear light source)
5 Upper reflector (first reflector)
6 Lower reflector (second reflector)
9 panels

In the road lighting apparatus shown in FIG. 3, the irradiation angle range θ <b> 1 of the primary reflected light from the reflecting mirror 5 is larger than the irradiation angle range θ <b> 2 of the primary reflected light from the reflecting mirror 6. The vertical distance D1 between the lower end 5c of the specular reflection surface 5a and the upper peripheral edge O1a of the opening O1 is smaller than the vertical distance D2 between the lower end 6c of the specular reflection surface 6a and the upper peripheral edge O2a of the opening O2. Note that the irradiation angle range θ2 may be larger than the irradiation angle range θ1. Further, the vertical distance D1 may be configured to be equal to the vertical distance D2 or larger than the vertical distance D2.

Claims (2)

From the side of the road surface of the road, a road lighting device that illuminates the first region constituting the road surface and the second region located farther than the first region,
A housing having a projection opening;
A translucent panel disposed so as to close the light projection opening;
A first linear light source composed of a plurality of light emitting elements disposed in the housing;
A second linear light source composed of a plurality of light emitting elements disposed below the first linear light source in the housing;
The light emitted from the first linear light source disposed in the housing is reflected toward one of the first region and the second region, and irradiated to the one region through the panel. A first reflecting mirror,
The light that is disposed below the first reflecting mirror in the housing and is emitted from the second linear light source is reflected toward the other region of the first region and the second region, and A second reflector that irradiates the other region through the panel;
Including road lighting fixtures.   The road lighting fixture according to claim 1, wherein the one region is the first region, and the other region is the second region.

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