JP6720593B2 - Road lighting lens and road lighting equipment - Google Patents

Description

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

BACKGROUND ART A road illuminator that includes an LED as a light source and a road illumination lens that covers the LED and controls the light of the LED to illuminate the road surface of the road is known. Further, there is known a road illumination lens having a reflecting surface in addition to an incident surface on which the light of the LED is incident and an emitting surface on which the light incident on the incident surface is emitted. The reflecting surface is a surface that reflects, of the light incident on the incident surface, the light that travels toward the back of the road lighting device (the side opposite to the road surface of the road) and directs the light toward the road surface. This reflection improves the utilization efficiency of light of the LED and suppresses the occurrence of light pollution (for example, Patent Document 1).

JP, 2016-24954, A

However, there is a problem that unevenness in illuminance occurs on the road surface due to reflection from the reflecting surface.
Therefore, an object of the present invention is to provide a road lighting lens and a road lighting fixture that can efficiently use light while suppressing illuminance unevenness due to reflection on a reflecting surface.

The present invention is a road illumination lens that is provided in a road lighting fixture that illuminates a road surface of a road and that controls light of a light emitting element included in the road lighting fixture, 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 emission surface, and a reflection surface that reflects light that is incident on the incident surface and that is directed toward the opposite side of the road surface of the road and that is emitted from the emission surface and directed toward the road surface. When, wherein the reflective surface has a first reflecting surface that controls the light are different from each other, and saw including a second reflecting surface, said first reflecting surface, a convex surface to spread the incident light in the direction of travel of the road It is characterized by being formed .

The present invention is a road illumination lens that is provided in a road lighting fixture that illuminates a road surface of a road and that controls light of a light emitting element included in the road lighting fixture, 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 emission surface, and a reflection surface that reflects light that is incident on the incident surface and that is directed toward the opposite side of the road surface of the road and that is emitted from the emission surface and directed toward the road surface. And, the reflecting surface includes a first reflecting surface and a second reflecting surface having different light controls, and the second reflecting surface is provided on both sides of the first reflecting surface in the traveling direction of the road. It is characterized in that it is provided for each and reflects incident light toward a far side in the traveling direction of the road.

In the road illumination lens of the present invention, the incident surface has 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. Is characterized by.

The present invention is a road illumination lens that is provided in a road lighting fixture that illuminates a road surface of a road and that controls light of a light emitting element included in the road lighting fixture, 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 emission surface, and a reflection surface that reflects light that is incident on the incident surface and that is directed toward the opposite side of the road surface of the road and that is emitted from the emission surface and directed toward the road surface. When, and a scattering portion for scattering light transmitted through the reflective surface, the reflective surface may be each first reflecting surface control of the light are different, and a second reflecting surface, it is characterized.

In the road illumination lens of the present invention, the exit surface may be provided with a recessed portion that is recessed toward the entrance surface, at a position intersecting the optical axis of the light emitting element.

The present invention is a road lighting device for illuminating the road surface of a road by the light of a plurality of light-emitting elements, each of the plurality of road lighting lens according to any one of the above, and the road lighting lens in the plane It is characterized in that it is provided with a light-transmissive plate body that is integrally provided and an instrument body that accommodates the light-emitting element, and the emission port of the instrument body is covered by the plate body.

In the present invention, the first reflecting surface that reflects the light with the highest luminous intensity among the lights that travel toward the opposite side of the road surface and the second reflecting surface that has a different light control from the first reflecting surface are the reflecting surfaces. Including. Therefore, while controlling the light with high luminous intensity by the first reflecting surface so as not to cause unevenness in illuminance, the light from the light emitting element is controlled by the second reflecting surface so as not to cause unevenness in illuminance according to the light distribution of the first reflecting surface. Since it can be controlled, it is possible to use the light without waste while suppressing the illuminance unevenness due to the reflected light on the reflecting surface.

It is a perspective view of the road luminaire which concerns on embodiment of this invention. It is a top view showing arrangement of a road lighting fixture. It is an illuminance distribution map of the road lighting equipment 1. It is a top view of the irradiation part seen from the bottom side of the instrument body. It is a side view of an irradiation part. FIG. 5 is a cross-sectional view of the cross section of the irradiation unit taken along the line IVa-IVa in FIG. 4. FIG. 5 is a cross-sectional view of the cross section of the irradiation unit taken along the line IVb-IVb in FIG. 4. FIG. 7 is an enlarged view of the single road illumination lens shown in FIG. 6. FIG. 9 is a ray diagram of the road illumination lens shown in FIG. 8. FIG. 8 is an enlarged view of one road illumination lens shown in FIG. 7. FIG. 11 is a ray diagram of the road illumination lens shown in FIG. 10. It is an illuminance distribution chart of the 1st recessed part of an entrance plane. It is an illuminance distribution chart of the 2nd recessed part of an incident surface. It is a top view showing composition of a lens for road lighting. It is an illuminance distribution chart of the 1st reflective surface of a reflective surface. It is an illuminance distribution chart of the 2nd reflective surface of a reflective surface.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a road lighting device 1 according to this embodiment. FIG. 2 is a plan view showing the arrangement of the road lighting device 1. FIG. 3 is an illuminance distribution chart of the road lighting device 1.

As shown in FIG. 2, the road lighting device 1 is attached to a pillar 9 that is erected on a road shoulder 7 that is a roadside portion of the road 8. When viewed from the pillar 9, the road surface on the front side in the transverse direction of the road 8 is viewed. 8R is illuminated 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. Further, of the crossing directions of the road 8, the front side is referred to as the front crossing direction B1, and the back side opposite thereto is called the back crossing direction B2. In addition, in FIG. 3, a point G indicates an arrangement position of the road lighting device 1.

As shown in FIG. 1, the road lighting fixture 1 includes a fixture body 10 and a lens-equipped cover 12.
The tool body 10 is a tool that is installed with the bottom surface 13 facing the road surface 8R, and is formed by die-cast molding (for example, aluminum die-casting) using a material having excellent thermal conductivity and corrosion resistance. .. Further, the bottom surface 13 is provided with an irradiation unit 14 and a housing unit 16. The irradiation unit 14 is housed in the emission port 11 provided on the tip 10A side of the instrument body 10, and the accommodation unit 16 is provided from the irradiation unit 14 to the rear end 10B side of the instrument body 10. ..

The irradiation unit 14 includes a plurality of LEDs 18 (FIG. 4), which are examples of light emitting elements, as a light source, and irradiates the road surface 8R with light from the LEDs 18 with a predetermined light distribution described later.
The housing portion 16 is a portion for housing various electric circuits and a clamp device. Examples of such an electric circuit include a power supply circuit that supplies electric power to the irradiation unit 14, a terminal block, and a dimming control circuit that controls dimming of the irradiation unit 14. The clamp device is a device fixed to the tip of the column 9. A lid body 20 that opens downward is provided on the bottom surface 13 at a position corresponding to the housing portion 16. At the time of installation work or maintenance work of the road lighting equipment 1, the lid 20 is opened downward to access the inside of the accommodating portion 16 for work.

FIG. 4 is a plan view of the irradiation unit 14 viewed from the side of the bottom surface 13 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.
As shown in FIGS. 5 to 7, the irradiation section 14 includes an LED board 22 and a lens-equipped cover 12.
As shown in FIGS. 6 and 7, the LED board 22 includes a mounting board 24 having a substantially rectangular plate shape, and the mounting surface 24</b>A of the mounting board 24 has a plurality of LEDs 18 (six LEDs in this embodiment: FIG. 4). Are arranged.
For the LED 18, an LED element having a substantially Lambert light distribution, which has a color temperature, a wavelength, and a luminance required for road lighting, is used. Each of these LEDs 18 is mounted on the mounting surface 24A formed of the same plane so as not to cause variations in the direction of the optical axis K. Further, as shown in FIG. 6 and FIG. 7, each of the LEDs 18 is mounted on the mounting substrate 24 in a posture in which the optical axis K is perpendicular to the mounting surface 24A. 10 are arranged substantially perpendicular to the opening surface of the emission port 11.

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

Here, as shown in FIGS. 6 and 7, a fixing base 19 to which the LED substrate 22 is attached and fixed, and an enclosure wall 15 that surrounds the fixing base 19 are formed inside the instrument body 10. ing. The tip portion 15A of the surrounding wall 15 contacts the back surface of the base plate body 30 in a watertight manner, and with this structure, the space including the fixing base 19 is watertightly closed by the surrounding wall 15 and the base plate body 30. A packing may be provided between the surrounding wall 15 and the base plate body 30. Further, the fixing table 19 is a portion integrally provided in the instrument body 10, functions as a heat sink of the LED substrate 22, and transfers the heat of the LED substrate 22 to the outer surface of the instrument body 10 to radiate the heat. Due to this heat dissipation, heat sinking in the space enclosed by the surrounding wall 15 and the base plate body 30 is suppressed.

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

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

As shown in FIGS. 8 and 10, the road illumination lens 40 has an emission surface 42 that bulges in a convex shape from the surface 30A of the base plate body 30, and the bottom surface 30B of the base plate body 30 has , A concave incident surface 44 that is concave toward the emission surface 42 side is provided at a position that covers the LED 18. Further, as shown in FIG. 10, the road illumination lens 40 is provided with a reflecting surface 45 in a cross section in the transverse direction.

The road lighting lens 40 illuminates the road 8 with a symmetrical light distribution when viewed from the road lighting fixture 1, and the light distribution shape is a substantially rectangular shape extending 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 concave portion 44A at a substantially central portion (that is, a portion intersecting the optical axis K) in the traveling direction cross section. .. Further, in the emission surface 42, a recess 46 slightly recessed toward the incident surface 44 is provided at a position where the light incident on the first recess 44A is emitted in the traveling direction cross section. 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 traveling direction cross section.

12 is an illuminance distribution chart of the first concave portion 44A of the incident surface 44, and FIG. 13 is an illuminance distribution chart of the second concave portion 44B of the incident surface 44.
As shown in FIG. 9, the first concave portion 44A and the concave portion 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, a substantially elliptical light distribution Q1 extending along the traveling direction A is formed. Note that the recess 46 may be a substantially flat surface.

Further, as shown in FIG. 9, each of the second recesses 44B on both the left and right sides of the first recess 44A refracts the emitted light Mb of the LED 18 toward the far side in the traveling direction A. As a result, as shown in FIG. 13, each of the second recesses 44B extends substantially in the transverse direction of the road 8 at 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 substantially rectangular range E (FIG. 2) where the light distributions Q1 and Q2 under the control of the first concave portion 44A and the second concave portion 44B of the incident surface 44 are overlapped on the road surface 8R and extend along the traveling direction A is illuminated. ..

By the way, the emitted light of the LED 18 may include ring-shaped color unevenness such as a yellow ring. On the other hand, in the structure of the incident surface 44, the first concave portion 44A spreads the emitted light Ma having less yellowness to the far side in the traveling direction A to form the light distribution Q1, and the emitted light Mb having many yellowish rays is provided. By overlapping with the light distribution Q2 controlled by the two recesses 44B, the occurrence of color unevenness on the road surface 8R can be suppressed.
As an example of an LED having ring-shaped color unevenness in radiated light, an LED element and a phosphor resin that covers and seals the LED element are provided, and the phosphor resin is fluorescent 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 can be used.

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

Further, the transverse direction incident surface 48 is formed by an inclined surface extending from the end portion 44T1 of the incident surface 44 in the transverse direction cross section in the front side transverse direction B1 to intersect with the optical axis K of the LED 18.
In this way, since the transverse direction incident surface 48 intersects the optical axis K, the emitted 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. Therefore, the transverse direction is illuminated efficiently. Further, since the light traveling in the back-side crossing direction B2, that is, the light traveling in the direction opposite to the road 8 as viewed from the road lighting device 1 is directed in the front-side crossing direction B1, so-called light pollution can be suppressed.

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

In the cross section in the transverse direction, the apex portion of the emission surface 42 is formed as a whole such that the normal direction N is inclined in the rear side transverse direction B2 with respect to the optical axis K. Due to the inclination of the emission surface 42, the spread of light in the width direction of the road becomes large, and a light distribution suitable for illumination of the road 8 having a wide width in the transverse direction can be obtained.
However, the concave portion 46 that is recessed toward the incident surface 44 side is formed at a position where the optical axis K intersects with the top portion of the emitting surface 42. The concave portion 46 spreads the optical axis K and the light having a relatively high luminous intensity in the vicinity of the optical axis K. Therefore, in the cross section in the transverse direction, the light emitted from the optical axis K and the emission surface 42 in the vicinity of the optical axis K is caused. It can 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 that intersects the optical axis K illuminates substantially right under the road lighting fixture 1, so that the recess 46 is provided directly under the light. It is prevented from becoming too bright.
The inclination of the emission 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 a certain extent, the normal direction N may coincide with the optical axis K, or the front side crossing direction B1 may tilt.

Now, as described above, the road illumination lens 40 is provided with the reflecting surface 45 on the rear cross direction B2 side of the cross incidence surface 48 in the cross section.
The reflecting surface 45 is a surface that controls the emitted light Md that does not enter the transverse incident surface 48 of the light incident on the incident surface 44 by reflection and directs it toward the road surface 8R. The reflecting surface 45 is formed by the recess 52 provided on the side of the entrance surface 44 in the back-side transverse direction B2 in the transverse direction cross section.
Note that the reflection surface 45 does not have to completely reflect all the incident light as long as the light utilization efficiency is within the allowable range and illuminance unevenness does not occur.
Further, by optically designing the reflection surface 45 as a total reflection surface, the light utilization efficiency can be improved.

FIG. 14 is a plan view showing the structure of the road illumination lens 40.
As shown in FIG. 14, the reflecting surface 45 includes a first reflecting surface 56 and a second reflecting surface 58 which are different in light control from each other, and the first reflecting surface 56 and the second reflecting surface 58 respectively. The reflected light of is overlapped and irradiates the road surface 8R. In this way, by providing the reflective surface 45 with a plurality of surfaces that are controlled differently, for example, as compared with the case where the reflective surface 45 is a single flat surface, the illuminance unevenness due to the reflected light of the reflective surface 45 and the light Diffusion is suppressed.

15 is an illuminance distribution chart of the first reflecting surface 56 of the reflecting surface 45, and FIG. 16 is an illuminance distribution chart of the second reflecting surface 58 of the reflecting surface 45.
The first reflecting surface 56 is a reflecting surface arranged in the back-side transverse direction B2 of the optical axis K in the transverse cross section and reflects the emitted light Md. The first reflecting surface 56 is formed as a convex surface that is convex in the front-side transverse direction B1. Similar to the first concave portion 44A of the entrance surface 44, the convex shape of the first reflecting surface 56 spreads the reflected light in the traveling direction A of the road 8 and extends in the traveling direction A as shown in FIG. Form the light distribution of Q3. Further, since the first reflecting surface 56 spreads and irradiates, the illuminance immediately below the road lighting fixture 1 is suppressed and the occurrence of illuminance unevenness is suppressed.

On the other hand, the second reflecting surfaces 58 are arranged on both sides of the first reflecting surface 56 in the traveling direction A of the road 8 and reflect the 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 of the light distribution Q3 created by the first reflecting surface 56 in the traveling direction A, and The illuminance of the reflected light by the first reflecting surface 56 at the end of is compensated.

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 reflecting surface 45 is the light distribution Q3, Q4 of the first reflecting surface 56 and the second reflecting surface 58. Overlapping on the road surface 8R and extending along the traveling direction A, the light distribution has a uniform illuminance.
Further, since the reflecting surface 45 includes the first reflecting surface 56 and the second reflecting surface 58, the LED 18 includes ring-shaped color unevenness in the emitted light, like the first concave portion 44A and the second concave portion 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 56A and 56B that are vertically arranged in the cross section. The control surface 56A and the control surface 56B are surfaces that are inclined according to the incident angle of each ray of the emitted light Md so that the ray does not fall below the critical angle. As a result, it is possible to reduce the amount of light that escapes without being reflected by the first reflecting surface 56, and to direct the light in the transverse direction of the road 8 at a predetermined angle without unevenness. Further, the shape of the first reflecting surface 56 can be made smaller than that in the case where the first reflecting surface 56 does not include the control surface 56A and the control surface 56B and performs the same control.

Further, as shown in FIG. 10 and FIG. 11, the road illumination lens 40 has light transmitted through the reflecting surface 45 and emitted light Md directly entering from the LED 18 without entering the reflecting surface 45 (FIG. 11). A scattering unit 60 that scatters light is provided. The scattering section 60 is arranged at a position on the back side in the transverse direction B2 with respect to the reflecting surface 45 in the transverse direction cross section, and includes a scattering surface 62 facing the reflecting surface 45. The scattering surface 62 is a surface that scatters incident light in a disordered direction due to frosting or unevenness. Due to the scattering of the scattering surface 62, the intensity of the light traveling from the road illumination lens 40 in the back-side transverse direction B2 is suppressed, and so-called light pollution is suppressed.
In this road illumination lens 40, the scattering surface 62 is formed on the side surface of the recess 52 provided with the reflecting surface 45. In the cross section in the transverse direction, the surface 64 (FIG. 10) of the emission surface 42 from which the light is emitted in the back side transverse direction B2 opposite to the road surface 8R may be a scattering surface.

Then, according to the road lighting device 1, as shown in FIG. 3 above, by the light distribution control of the road lighting lens 40, the road surface 8R extends along the traveling direction A and is illuminated with a relatively uniform illuminance. ..

As described above, according to this embodiment, the following effects are achieved.
In the road lighting apparatus 1 of the present embodiment, the road lighting lens 40 includes the reflecting surface 45, and the reflecting surface 45 includes the first reflecting surface 56 that reflects the light traveling toward the opposite side of the road surface 8R of the road 8. The first reflection surface 56 includes a second reflection surface 58 whose light control is different.
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. As a result, uneven illuminance due to the reflected light from the reflecting surface 45 can be suppressed.

Further, since the first reflecting surface 56 is formed as a convex surface that spreads the incident light in the traveling direction A of the road 8, the reflected light is spread and the occurrence of uneven illuminance due to the reflected light of the reflecting surface 45 is effectively suppressed. ..

Further, since the second reflecting surface 58 reflects the incident light toward the far side in the traveling direction A of the road 8, the decrease in the illuminance of the reflected light from the first reflecting surface 56 at the far distance is compensated.

Further, the road lighting 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.
As a result, 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 to the front side transverse direction B1, so that the road 8 is illuminated efficiently. Further, since the light of the LED 18 traveling in the rear-side transverse direction B2, that is, the light of the LED 18 traveling in the direction opposite to the road 8 as viewed from the road lighting device 1, is directed in the front-side transverse direction B1, so-called light pollution can be suppressed.

The road illumination lens 40 also includes a scattering unit 60 that scatters the light transmitted through the reflecting surface 45.
As a result, the intensity of the light traveling from the road lighting lens 40 in the back-side transverse direction B2 is suppressed, and so-called light pollution is more reliably suppressed.

Further, the exit surface 42 of the road illumination lens 40 is provided with a concave portion 46 that is recessed toward the entrance surface 44 side, at a position intersecting the optical axis K of the LED 18.
Accordingly, in the cross section in the transverse direction, it is possible to prevent the illuminance from being excessively high on the emission surface 42 at the optical axis K and a portion illuminated by the light emitted from the vicinity of the optical axis K.

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 instead of the LED 18 for the light emitting element.
Further, the present invention can be used not only for the road 8 on which the vehicle travels but also for lighting a street or a tunnel, for example.

1 Road Lighting Equipment 8 Road 8R Road Surface 10 Fixture Main Body 11 Exit Port 12 Lens Cover 18 LED (Light Emitting Element)
22 LED Substrate 24 Mounting Substrate 30 Base Plate 40 Road Lighting Lens 42 Emitting Surface 44 Incident Surface 45 Reflecting Surface 46 Recessed 48 Transverse Direction Incident Surface 56 First Reflecting Surface 58 Second Reflecting Surface 60 Scattering Part A Running Direction B1 Front Side Cross direction B2 Back side cross direction K Optical axis N Normal direction

Claims (6)

A lens for road lighting, which is provided in a road lighting device for illuminating a road surface of a road, and which controls light of a light emitting element included in the road lighting device,
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 emission surface,
A reflecting surface that is incident on the incident surface and reflects light that is directed toward the opposite side of the road surface of the road and that is emitted from the exit surface and is directed toward the road surface,
The reflective surface is
Viewed including first reflecting surface control of the light are different, and the second reflecting surface to each other,
The lens for road illumination, wherein the first reflecting surface is formed as a convex surface that spreads incident light in a traveling direction of the road. A lens for road lighting, which is provided in a road lighting device for illuminating a road surface of a road, and which controls light of a light emitting element included in the road lighting device,
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 emission surface,
A reflecting surface that is incident on the incident surface and reflects light that is directed toward the opposite side of the road surface of the road and that is emitted from the exit surface and is directed toward the road surface,
The reflective surface is
Viewed including first reflecting surface control of the light are different, and the second reflecting surface to each other,
The second reflective surface is
Provided on both sides of the first reflecting surface in the traveling direction of the road,
A road illumination lens, characterized in that incident light is reflected toward a distance in the traveling direction of the road. A lens for road lighting, which is provided in a road lighting device for illuminating a road surface of a road, and which controls light of a light emitting element included in the road lighting device,
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 emission surface,
A reflecting surface that is incident on the incident surface and reflects light that is directed toward the opposite side of the road surface of the road and that is emitted from the exit surface and is directed toward the road surface,
A scattering unit that scatters the light transmitted through the reflecting surface ,
The reflective surface is
A first reflection surface and a second reflection surface, which have different light control from each other,
A road lighting lens characterized by the above. The incident surface is
The road according to any one of claims 1 to 3, wherein a cross-direction incidence surface that refracts light of the light emitting element toward a road surface of the road is provided in a portion that intersects an optical axis of the light emitting element. Lighting lens. On the exit surface,
The road illumination lens according to any one of claims 1 to 4 , wherein a recessed portion that is recessed on the side of the incident surface is provided at a position 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 lenses for road illumination according to any one of claims 1 to 5 ,
A light-transmissive plate body in which each of the road illumination lenses is integrally provided in a plane,
An instrument main body for accommodating the light emitting element,
A road lighting fixture, wherein the exit of the fixture body is covered by the plate.

Images