JP2017162697A - Lens for road illumination and road illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress illuminance unevenness by a reflection surface.SOLUTION: A lens 40 for road illumination which is provided at a road illumination device 1 for illuminating a road surface 8R of a road 8, and which controls light of an LED 18 which is included by the road illumination device 1 includes: an emission surface 42 from which light of the LED 18 emits; an incident surface 44 for covering the LED 18 and recessed on the emission surface 42 side; and a reflection surface 45 for reflecting the light entering the incident surface 44 and going to the opposite side from the road surface 8R of the road 8, emitting it from the emission surface 42, and allowing it to go toward the road surface 8R. The reflection surface 45 includes: a first reflection surface 56 for reflecting the light with highest light intensity out of the light going to the opposite side from the road surface 8R; and a second reflection surface 58 whose light control is different from that of the first reflection surface 56.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a road lighting lens and a road lighting fixture.

  2. Description of the Related Art A road lighting device that includes an LED that is a light source and a road illumination lens that covers the LED and controls the light of the LED, and illuminates the road surface of the road is known. In addition to the incident surface on which the LED light is incident and the exit surface from which the light incident on the incident surface is emitted, a road illumination lens having a reflecting surface is known. The reflecting surface is a surface that reflects the light traveling toward the back of the road luminaire (opposite to the road surface of the road) out of the light incident on the incident surface and directs it toward the road surface. By this reflection, improvement in the light use efficiency of the LED and generation of light damage are suppressed (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-24954

However, there is a problem that unevenness of illumination occurs on the road surface due to reflection of the reflecting surface.
SUMMARY OF THE INVENTION An object of the present invention is to provide a road lighting lens and a road lighting device that can efficiently use light while suppressing unevenness in illuminance due to reflection on a reflecting surface.

  The present invention is a road illumination lens that is provided in a road illuminator that illuminates the road surface of the road, and controls light of a light emitting element provided in the road illuminator, and an emission surface from which the light of the light emitting element is emitted, An incident surface that covers the light emitting element and is recessed toward the exit surface; and a reflective surface that is incident on the entrance surface and reflects light that is directed to the opposite side of the road surface of the road and is emitted from the exit surface and directed toward the road surface The reflective surface includes a first reflective surface and a second reflective surface that are different from each other in light control.

  The present invention is characterized in that, in the road illumination lens, the first reflecting surface is formed as a convex surface that spreads incident light in a traveling direction of the road.

  According to the present invention, in the road illumination lens, the second reflecting surface is provided on each side of the first reflecting surface in the road traveling direction, and the incident light is directed far away in the road traveling direction. It is characterized by being reflected.

  According to the present invention, in the lens for road illumination, the incident surface has a transverse direction incident surface that refracts the light of the light emitting element toward the road surface of the road at a portion intersecting the optical axis of the light emitting element. It is characterized by.

  The present invention is characterized in that the road illumination lens includes a scattering portion that scatters the light transmitted through the reflection surface.

  The present invention is characterized in that, in the road illumination lens, the exit surface is provided with a recess that is recessed toward the entrance surface at a location that intersects the optical axis of the light emitting element.

  The present invention is a road lighting device that illuminates a road surface with light from a plurality of light emitting elements, and each of the plurality of road illumination lenses according to any one of the above and the road illumination lens is in-plane. A light-transmitting plate provided integrally and a device main body for housing the light emitting element are provided, and an emission port of the device main body is covered with the plate.

  In the present invention, the reflecting surface includes a first reflecting surface that reflects light having the highest luminous intensity among light traveling toward the opposite side of the road surface, and a second reflecting surface that is different in light control from the first reflecting surface. Including. Therefore, the light of the light emitting element is controlled by the second reflecting surface so that the illuminance unevenness does not occur according to the light distribution of the first reflecting surface while the light having high luminous intensity is controlled by the first reflecting surface so that the illuminance unevenness does not occur. Since it can be controlled, it is possible to use light without waste while suppressing unevenness in illuminance due to reflected light from the reflecting surface.

1 is a perspective view of a road lighting device according to an embodiment of the present invention. It is a top view which shows arrangement | positioning of a road lighting fixture. 2 is an illuminance distribution diagram of the road lighting device 1. FIG. It is a top view of the irradiation part seen from the bottom face side of an instrument main part. It is a side view of an irradiation part. FIG. 5 is a cross-sectional view of a cross section of an irradiation unit taken along a IVa-IVa cross-sectional line in FIG. 4. FIG. 5 is a cross-sectional view of a cross section of an irradiation unit taken along a line IVb-IVb in FIG. 4. FIG. 7 is an enlarged view of one road illumination lens shown in FIG. 6. FIG. 9 is a light ray diagram of the road illumination lens illustrated in FIG. 8. FIG. 8 is an enlarged view of one road illumination lens shown in FIG. 7. It is a light ray diagram of the lens for road illumination shown in FIG. It is an illumination intensity distribution map of the 1st recessed part of an entrance plane. It is an illumination intensity distribution map of the 2nd recessed part of an entrance plane. It is a top view which shows the structure of the lens for road illumination. It is an illuminance distribution figure of the 1st reflective surface of a reflective surface. It is an illuminance distribution figure of the 2nd reflective surface of a reflective surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a road lighting device 1 according to the present embodiment. FIG. 2 is a plan view showing the arrangement of the road lighting device 1. FIG. 3 is an illuminance distribution diagram of the road lighting device 1.

  As shown in FIG. 2, the road lighting device 1 is attached to a column 9 erected on a road shoulder 7, which is a roadside portion of the road 8, and the road surface on the front side in the transverse direction of the road 8 as viewed from the column 9. Illuminate 8R from the shoulder 7. In this illumination, the road lighting device 1 illuminates a substantially rectangular range E extending in the traveling direction A of the road 8 with the illuminance distribution shown in FIG. 3 as shown in FIG. The traveling direction A is the traveling direction (forward direction) of the vehicle traveling on the road 8. Of the crossing direction of the road 8, the front side is referred to as a front side crossing direction B1, and the back side opposite to the front side is referred to as a back side crossing direction B2. Moreover, in FIG. 3, the point G shows the arrangement position of the road lighting fixture 1.

As shown in FIG. 1, the road lighting device 1 includes a device body 10 and a cover 12 with a lens.
The instrument main body 10 is an instrument installed in a posture in which the bottom surface 13 faces the road surface 8R, and is formed by die casting (for example, aluminum die casting) using a material excellent in thermal conductivity and corrosion resistance. . The bottom surface 13 is provided with an irradiation unit 14 and a storage unit 16. The irradiation unit 14 is housed in the emission port 11 provided on the distal end 10 </ b> A side of the instrument main body 10, and the storage unit 16 is provided from the irradiation unit 14 to the rear end 10 </ b> B side of the instrument main body 10. .

The irradiation unit 14 includes a plurality of LEDs 18 (FIG. 4) as an example of a light emitting element in a light source, and irradiates the road surface 8 </ b> R with a predetermined light distribution described later with the light of these LEDs 18.
The accommodating part 16 is a part for accommodating various electric circuits and a clamping device. Examples of the electric circuit include a power supply circuit that supplies power to the irradiation unit 14, a terminal block, and a dimming control circuit that performs dimming control on the irradiation unit 14. The clamp device is a device that is fixed to the tip of the column 9. The bottom surface 13 is provided with a lid 20 that opens downward at a location corresponding to the accommodating portion 16. At the time of installation work or maintenance work of the road lighting device 1, the lid body 20 is opened downward, and the work is performed by accessing the inside of the housing portion 16.

FIG. 4 is a plan view of the irradiation unit 14 as viewed from the bottom surface 13 side of the instrument body 10, and FIG. 5 is a side view of the irradiation unit 14. 6 is a cross-sectional view of the irradiation unit 14 taken along the IVa-IVa cross-sectional line of FIG. 4, and FIG. 7 is a cross-sectional view of the irradiation unit 14 taken along the IVb-IVb cross-sectional line of FIG.
The irradiation part 14 is provided with the LED board 22 and the cover 12 with a lens, as shown in FIGS.
As shown in FIGS. 6 and 7, the LED substrate 22 includes a substantially rectangular plate-shaped mounting substrate 24, and a plurality of LEDs 18 (six in this embodiment: FIG. 4) are provided on the mounting surface 24A of the mounting substrate 24. Is arranged.
As the LED 18, an LED element having a color temperature, a wavelength, and luminance required for road lighting and having a substantially Lambert light distribution is used. Each of these LEDs 18 is mounted on a mounting surface 24A composed of the same plane so that there is no variation in the direction of the optical axis K. Further, as shown in FIGS. 6 and 7, each of the LEDs 18 is mounted on the mounting substrate 24 in such a posture that the optical axis K is perpendicular to the mounting surface 24 </ b> A. The ten exit ports 11 are arranged substantially perpendicularly to the opening surface.

The cover with lens 12 includes a waterproof function for covering and waterproofing the LED substrate 22 and a light distribution function for controlling the emitted light of the LED 18. Specifically, as shown in FIGS. 4 to 7, the lens-attached cover 12 includes a base plate 30 and a plurality of road illumination lenses 40.
The base plate 30 is a light transmissive plate that transmits the radiated light of the LED 18. The base plate 30 is made of, for example, resin, and is fixed to the instrument body 10 and covers the emission port 11.

  Here, as shown in FIGS. 6 and 7, the fixture base 19 to which the LED board 22 is attached and fixed and the surrounding wall 15 surrounding the fixed base 19 are formed inside the instrument body 10. ing. The front end portion 15 </ b> A of the surrounding wall 15 abuts against the back surface of the base plate 30 in a watertight manner, and the space including the fixed base 19 is closed in a watertight manner by the surrounding wall 15 and the base plate 30 by this structure. A packing may be provided between the surrounding wall 15 and the base plate 30. The fixing base 19 is a part provided integrally with the instrument body 10 and functions as a heat sink for the LED board 22, and transfers heat from the LED board 22 to the outer surface of the instrument body 10 to dissipate heat. By this heat radiation, heat buildup in the space closed by the surrounding wall 15 and the base plate 30 is suppressed.

  Further, as shown in FIGS. 5 to 7, a concave portion 31 is formed in the front surface 30 </ b> A of the base plate body 30, and the road illumination lens 40 is integrally provided in the concave portion 31. ing. With this recess 31, for example, the road illumination lens 40 is easily placed close to each LED 18 on the LED board 22 without raising the fixed base 19, for example. Furthermore, the road illumination lens 40 is less likely to be damaged by being disposed at a position where the road illumination lens 40 is recessed (lower position) than the outer frame portion 32 around the recess 31. The road illumination lens 40 is a lens that controls the light of the LED 18 to form a predetermined light distribution, and is provided for each LED 18.

8 is an enlarged view of one road illumination lens 40 shown in FIG. 6, and FIG. 9 is a ray diagram of the road illumination lens 40 shown in FIG. 10 is an enlarged view of one road illumination lens 40 shown in FIG. 7, and FIG. 11 is a ray diagram of the road illumination lens 40 shown in FIG.
In the enlarged view of FIG. 8, the road illumination lens 40 is cut along a plane that is parallel to the travel direction A and includes the optical axis K of the LED 18 that is covered by the road illumination lens 40 (hereinafter referred to as “cross section in the travel direction”). A cross section is shown. That is, FIG. 9 is a ray diagram in a cross section in the traveling direction. The enlarged view of FIG. 10 is a road parallel to the front-side transverse direction B1 and the rear-side transverse direction B2 and including the optical axis K of the LED 18 covered by the road illumination lens 40 (hereinafter referred to as “cross-sectional section”). The cross section which cut the lens 40 for illumination is shown. That is, FIG. 11 is a ray diagram in a cross section in the transverse direction.

  As shown in FIGS. 8 and 10, the road illumination lens 40 has an exit surface 42 that protrudes from the surface 30 </ b> A of the base plate 30, and the bottom surface 30 </ b> B of the base plate 30 has a bottom surface 30 </ b> B. A concave incident surface 44 that is recessed toward the emission surface 42 is provided at a position that covers the LED 18. Furthermore, as shown in FIG. 10, the road illumination lens 40 is provided with a reflecting surface 45 in the cross section in the transverse direction.

The road illumination lens 40 illuminates the road 8 with a light distribution that is symmetrical with respect to the road lighting device 1, and the light distribution shape is a substantially rectangular shape that extends in the traveling direction A of the road 8 as described above. (FIGS. 2 and 3).
More specifically, as shown in FIG. 8, the entrance surface 44 of the road illumination lens 40 is provided with a first recess 44 </ b> A at a substantially central position (that is, a location intersecting the optical axis K) in the cross section in the traveling direction. . In addition, the exit surface 42 is provided with a recess 46 that is slightly recessed on the entrance surface 44 side at a location for emitting the light incident on the first recess 44A in the cross section in the traveling direction. Further, as shown in FIG. 8, the entrance surface 44 is provided with second recesses 44B on both sides of the first recess 44A in the cross section in the traveling direction.

12 is an illuminance distribution diagram of the first concave portion 44A of the incident surface 44, and FIG. 13 is an illuminance distribution diagram of the second concave portion 44B of the incident surface 44.
As shown in FIG. 9, the first recess 44 </ b> A and the recess 46 refract the emitted light Ma of the LED 18 on the optical axis K and in the vicinity of the optical axis K to the left and right in the traveling direction A. Thereby, as shown in FIG. 12, the substantially elliptical light distribution Q1 extended along the traveling direction A is formed. In addition, the recessed part 46 can also be made into a substantially flat surface.

Each of the second concave portions 44B on the left and right sides of the first concave portion 44A refracts the radiated light Mb of the LED 18 toward the far side in the traveling direction A, as shown in FIG. Accordingly, as shown in FIG. 13, each of the second recesses 44B extends substantially in the transverse direction of the road 8 to the end Q1A in the traveling direction A of the substantially elliptical light distribution Q1 formed by the first recess 44A. An elliptical light distribution Q2 is formed.
Then, the light distributions Q1 and Q2 controlled by the first concave portion 44A and the second concave portion 44B of the incident surface 44 are superimposed on the road surface 8R, and the substantially rectangular range E (FIG. 2) extending along the traveling direction A is illuminated. .

Incidentally, the emitted light of the LED 18 may include ring-shaped color unevenness such as a yellow ring. On the other hand, in the configuration of the incident surface 44, the first concave portion 44A spreads the radiated light Ma with less yellowness to a distance in the traveling direction A to form the light distribution Q1, and the radiated light Mb with much yellowness is changed to the first. By overlapping the light distribution Q2 controlled by the two concave portions 44B, occurrence of color unevenness on the road surface 8R can be suppressed.
In addition, as an example of the LED having ring-shaped color unevenness in the radiated light, the LED element and a phosphor resin that covers and seals the LED element, the phosphor resin fluoresces by the light of the LED element, An LED having a configuration that emits light in which the fluorescence and the light of the LED element are mixed is exemplified.

Next, the configuration of the cross section in the transverse direction of the road illumination lens 40 will be described in detail.
The road illumination lens 40 spreads the light of the LED 18 in the transverse direction of the road 8 and irradiates it in the cross section in the transverse direction. Specifically, as shown in FIG. 10, the incident surface 44 is provided with a transverse incident surface 48 in the transverse section. The transverse incident surface 48 is a surface that refracts the radiated light Mc of the LED 18 in the front transverse direction B1 of the road 8 and illuminates a range over the entire transverse width of the road surface 8R of the road 8 by this refracted light. . The transverse incidence surface 48 is formed by a slope whose normal direction N is inclined in the front transverse direction B1 with respect to the optical axis K.

Further, the transverse incident surface 48 is formed by a slope extending from the end 44T1 in the transverse direction B1 on the front side of the incident surface 44 in the transverse section until it intersects the optical axis K of the LED 18.
Thus, the transverse incident surface 48 intersects the optical axis K, so that the radiated light Mc having a relatively high luminous intensity on the optical axis K and in the vicinity of the optical axis K is reliably directed in the front transverse direction B1. So the cross direction is illuminated efficiently. Moreover, since the light which goes to the back side cross direction B2, ie, the light which goes to the opposite side to the road 8 seeing from the road lighting fixture 1, is directed to the front side cross direction B1, so-called light pollution is also suppressed.

  Further, in the incident surface 44 in the cross section in the transverse direction, the surface between the end portion 44T2 in the rear side transverse direction B2 and the transverse direction incident surface 48 is the transmission surface 50. The transmission surface 50 is a surface that transmits incident light to the reflection surface 45 provided in the rear side transverse direction B2. As shown in FIG. 11, this incident light does not enter the transverse incidence surface 48, but radiates from the LED 18 toward the back side transverse direction B <b> 2, that is, radiation toward the side opposite to the road 8 when viewed from the road lighting device 1. Light Md. The emitted light Md is controlled by the reflecting surface 45. The reflecting surface 45 will be described in detail later.

In the cross section in the transverse direction, the top of the emission surface 42 is formed as a whole on the surface in which the normal direction N is inclined in the back side transverse direction B2 from the optical axis K. Due to the inclination of the emission surface 42, the spread of light in the road width direction is increased, and a light distribution suitable for illumination of the road 8 having a wide width in the transverse direction is obtained.
However, the concave portion 46 that is recessed toward the incident surface 44 is formed at a location where the optical axis K at the top of the emission surface 42 intersects. The concave portion 46 spreads light having a relatively high luminous intensity in the vicinity of the optical axis K and the optical axis K. Therefore, the light emitted from the optical axis K and the exit surface 42 in the vicinity of the optical axis K in the cross section in the transverse direction. It is possible to prevent the illuminance of the illuminated area from becoming too high. In particular, in this road illumination lens 40, the light emitted from the location of the emission surface 42 intersecting the optical axis K illuminates the area immediately below the road lighting fixture 1, so that the depression 46 is provided so that the light is directly below. It is prevented from becoming too bright.
The inclination of the exit surface 42 is adjusted according to the width of the road 8 in the transverse direction (so-called road width). When the road width is narrow to some extent, the normal direction N may coincide with the optical axis K or may be inclined in the front-side transverse direction B1.

As described above, the road illumination lens 40 is provided with the reflecting surface 45 on the back side transverse direction B2 side with respect to the transverse direction entrance surface 48 in the transverse section.
The reflecting surface 45 is a surface that controls the radiated light Md that is not incident on the transverse incident surface 48 out of the light incident on the incident surface 44 by reflection and directs it toward the road surface 8R. The reflection surface 45 is formed by a concave portion 52 provided on the back surface side transverse direction B2 side of the incident surface 44 in the transverse cross section.
Note that the reflection surface 45 may not completely reflect all of the incident light as long as the light use efficiency is within an allowable range and illuminance unevenness does not occur.
In addition, the light utilization efficiency can be improved by optically designing the reflection surface 45 as a total reflection surface.

FIG. 14 is a plan view showing the configuration of the road illumination lens 40.
As shown in FIG. 14, the reflection surface 45 includes a first reflection surface 56 and a second reflection surface 58 that are different from each other in light control, and each of the first reflection surface 56 and the second reflection surface 58. Are reflected to irradiate the road surface 8R. In this way, by providing a plurality of surfaces with different controls on the reflection surface 45, for example, compared to a case where the reflection surface 45 is a single plane, the illuminance unevenness due to the reflected light of the reflection surface 45 and the light Diffusion is suppressed.

FIG. 15 is an illuminance distribution diagram of the first reflecting surface 56 of the reflecting surface 45, and FIG. 16 is an illuminance distribution diagram of the second reflecting surface 58 of the reflecting surface 45.
The first reflecting surface 56 is a reflecting surface arranged in the transverse direction B2 on the back side of the optical axis K in the cross section in the transverse direction, and reflects the radiation light Md. The 1st reflective surface 56 is formed in the convex surface convex in the front side cross direction B1. Similarly to the first concave portion 44A of the incident surface 44 described above, the reflected light is spread in the traveling direction A of the road 8 by the convex shape of the first reflecting surface 56 and extends in the traveling direction A as shown in FIG. The light distribution of Q3 is formed. Moreover, since the 1st reflective surface 56 expands and irradiates, the illumination intensity directly under the road lighting fixture 1 is suppressed, and generation | occurrence | production of illumination intensity nonuniformity is suppressed.

  On the other hand, the second reflecting surfaces 58 are disposed on both sides of the first reflecting surface 56 in the traveling direction A of the road 8 and reflect incident light toward the far side of the traveling direction A of the road 8. More specifically, as shown in FIG. 16, the second reflecting surface 58 forms a light distribution Q4 that illuminates the ends on both sides in the traveling direction A of the light distribution Q3 created by the first reflecting surface 56, and the both sides The illuminance of the reflected light by the first reflecting surface 56 at the end of is supplemented.

Therefore, similarly to the light distribution by the first concave portion 44A and the second concave portion 44B of the incident surface 44, the light distribution of the reflective surface 45 is the light distribution Q3, Q4 of the first reflective surface 56 and the second reflective surface 58. Overlapping on the road surface 8R and extending along the traveling direction A, the light distribution is uniform.
Further, since the reflection surface 45 includes the first reflection surface 56 and the second reflection surface 58, the LED 18 includes ring-shaped color unevenness in the emitted light, like the first recess 44A and the second recess 44B. Even in this case, color unevenness on the road surface 8R can be suppressed.

  Here, as shown in FIG. 14, the first reflecting surface 56 further includes two control surfaces 56 </ b> A and 56 </ b> B arranged vertically in the cross section in the transverse direction. The control surface 56A and the control surface 56B are surfaces that are inclined so that the light beam does not fall below the critical angle in accordance with the incident angle of each light beam of the radiation light Md. Thereby, it is possible to reduce light that passes through the first reflecting surface 56 without being reflected, and to direct light uniformly at a predetermined angle in the transverse direction of the road 8. In addition, the shape of the first reflecting surface 56 can be made smaller than when the first reflecting surface 56 is not provided with the control surface 56A and the control surface 56B and performs the same control.

As shown in FIGS. 10 and 11, the road illumination lens 40 has light transmitted through the reflection surface 45 and radiation light Md directly incident from the LED 18 without entering the reflection surface 45 (FIG. 11). The scattering part 60 which scatters is provided. The scattering unit 60 includes a scattering surface 62 that is disposed at a position in the rear side transverse direction B2 with respect to the reflecting surface 45 in the cross section in the transverse direction and faces the reflecting surface 45. The scattering surface 62 is a surface that scatters incident light in a disordered direction due to frost processing or formation of irregularities. Due to the scattering of the scattering surface 62, the intensity of light traveling from the road illumination lens 40 in the rear-side transverse direction B2 is suppressed, and so-called light damage is suppressed.
In the road illumination lens 40, the scattering surface 62 is formed on the side surface of the recess 52 provided with the reflection surface 45. In the cross section in the transverse direction, a surface 64 (FIG. 10) from which light is emitted toward the back side transverse direction B2 on the opposite side of the road surface 8R may be used as the scattering surface.

  And according to the road illuminating device 1, as shown in FIG. 3, the road surface 8R is illuminated with a relatively uniform illuminance extending along the traveling direction A by the light distribution control of the road illumination lens 40. .

As described above, according to the present embodiment, the following effects can be obtained.
In the road lighting device 1 of the present embodiment, the road illumination lens 40 includes a reflective surface 45, and the reflective surface 45 includes a first reflective surface 56 that reflects light toward the road surface 8 </ b> R opposite to the road 8, and The first reflection surface 56 includes a second reflection surface 58 that is different in light control.
Thereby, the reflected light from the reflecting surface 45 is controlled by the light distribution Q3 by the reflected light from the first reflecting surface 56 and the light distribution Q4 of the reflected light from the second reflecting surface 58 different from the light distribution Q3. Thus, unevenness in illuminance due to reflected light from the reflecting surface 45 is suppressed.

  Moreover, since the 1st reflective surface 56 is formed in the convex surface which spreads incident light to the running direction A of the road 8, reflected light is expanded and generation | occurrence | production of the illumination intensity nonuniformity by the reflected light of the reflective surface 45 is suppressed effectively. .

  Moreover, since the 2nd reflective surface 58 reflects incident light toward the far direction of the running direction A of the road 8, the fall of the illumination intensity of the reflected light of the 1st reflective surface 56 in a distant place is supplemented.

Further, the road illumination lens 40 has a transverse incident surface 48 that refracts the light of the LED 18 toward the road surface 8R of the road 8 at a portion intersecting the optical axis K of the LED 18.
Thereby, the light of the LED 18 having a relatively high luminous intensity on the optical axis K and in the vicinity of the optical axis K is reliably directed in the front transverse direction B1, so that the road 8 is efficiently illuminated. Moreover, since the light of LED18 which goes to the back side cross direction B2, ie, the light of LED18 which goes to the opposite side to the road 8 seeing from the road lighting fixture 1, is directed to the front side cross direction B1, so-called light damage is also suppressed.

The road illumination lens 40 includes a scattering unit 60 that scatters light transmitted through the reflecting surface 45.
Thereby, the intensity | strength of the light which goes to the back side transverse direction B2 from the lens 40 for road illumination is suppressed, and generation | occurrence | production of what is called light pollution is suppressed more reliably.

The exit surface 42 of the road illumination lens 40 is provided with a recess 46 that is recessed toward the entrance surface 44 at a location that intersects the optical axis K of the LED 18.
Thereby, in the cross section in the transverse direction, the illuminance of the portion illuminated by the light emitted from the optical axis K and the vicinity of the optical axis K in the emission surface 42 can be prevented from becoming too high.

The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.
For example, an organic EL may be used for the light emitting element instead of the LED 18.
In addition to the road 8 on which the vehicle runs, the present invention can also be used for lighting of streets and tunnels, for example.

DESCRIPTION OF SYMBOLS 1 Road lighting fixture 8 Road 8R Road surface 10 Appliance main body 11 Outlet 12 Cover with lens 18 LED (light emitting element)
DESCRIPTION OF SYMBOLS 22 LED board 24 Mounting board 30 Base board 40 Road illumination lens 42 Output surface 44 Incident surface 45 Reflective surface 46 Recessed part 48 Transverse direction incident surface 56 1st reflective surface 58 2nd reflective surface 60 Scattering part A Running direction B1 Front side Cross direction B2 Back side cross direction K Optical axis N Normal direction

Claims (7)

A road lighting lens that is provided in a road lighting device that illuminates the road surface of a road and controls light of a light emitting element provided in the road lighting device,
An exit surface from which light of the light emitting element exits;
An incident surface that covers the light emitting element and is recessed toward the exit surface;
A reflective surface that is incident on the incident surface and reflects light directed to the opposite side of the road surface of the road and is emitted from the output surface and directed toward the road surface;
The reflective surface is
Including a first reflecting surface and a second reflecting surface, each having different light control,
This is a lens for road lighting. The road illumination lens according to claim 1, wherein the first reflecting surface is formed as a convex surface that spreads incident light in a traveling direction of the road. The second reflecting surface is
Provided on both sides of the first reflecting surface in the traveling direction of the road,
The lens for road illumination according to claim 1, wherein incident light is reflected toward a distance in a traveling direction of the road. The incident surface is
The road according to any one of claims 1 to 3, further comprising a transverse incident surface that refracts light of the light emitting element toward a road surface of the road at a portion intersecting with an optical axis of the light emitting element. Lens for lighting. The road illumination lens according to claim 1, further comprising a scattering unit that scatters light transmitted through the reflection surface. On the exit surface,
The road illumination lens according to any one of claims 1 to 5, wherein a concave portion that is recessed toward the incident surface is provided at a location that intersects the optical axis of the light emitting element. A road lighting device that illuminates a road surface with light from a plurality of light emitting elements,
A plurality of road illumination lenses according to any one of claims 1 to 6,
A light-transmitting plate body in which each of the road lighting lenses is integrally provided in a plane;
An instrument body containing the light emitting element,
A road lighting device, wherein an exit port of the device body is covered with the plate.

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