JP2017162647A - Light source unit, and street lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain pro-beam light distribution which is hardly affected by an assembly accuracy of a fixture body.SOLUTION: A light source unit 12 is provided that includes an LED 18 and a first lens 32 for controlling the light of the LED 18, and is provided in a tunnel lighting fixture 1 for illuminating a road 3 in a tunnel 2. An optical axis K of the LED 18 is orthogonal to a driving direction A of the road 3, and the first lens 32 has a concave incident face 44 which is concave toward an emission face 42. The incident face 44 is configured to refract the light of the LED 18 toward the side of the driving direction A of the road 3 at a part where the light intersects with the optical axis K of the LED 18.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light source unit and a road lighting fixture.

As illumination methods for tunnel illumination, a symmetric illumination method and an asymmetric illumination method are known, and a pro-beam illumination method is known as one of the asymmetric illumination methods (see, for example, Patent Document 1 and Patent Document 2).
The symmetric illumination method is an illumination method in which the light distribution of the luminaire is substantially symmetric with respect to the road longitudinal direction (road traveling direction). The asymmetric illumination system is an illumination system in which the light distribution of the luminaire is asymmetric with respect to the longitudinal direction of the road. The pro-beam illumination method is an illumination method in which a light distribution peak is present at a location shifted in the traffic direction of the road from the front of the luminaire.

  Conventionally, as shown in Patent Document 1 and Patent Document 2, a lighting fixture that realizes a pro-beam illumination system has an LED mounting substrate having a predetermined angle with respect to a housing, or houses an LED. Pro-beam light distribution is obtained by tilting the instrument body with respect to the instrument mounting surface.

JP 20147072 A JP 2013-143319 A

However, in the conventional lighting fixtures, there is a problem in that the light distribution characteristics are easily affected by the accuracy of assembly and mounting of the mounting substrate to the fixture body and the assembly of each part of the fixture body in the manufacturing and assembly process of the lighting fixture. is there.
This problem is not limited to tunnel lighting, but is a problem common to asymmetrical illumination road lighting.
Therefore, an object of the present invention is to provide a light source unit and a road lighting device that can obtain a pro-beam light distribution that is hardly affected by the assembly accuracy of the device body.

  The present invention is a light source unit that includes a light-emitting element and a lens that controls light of the light-emitting element, and is provided in a lighting fixture that illuminates a road. An incident surface is included, and the incident surface refracts light of the light emitting element toward a traveling direction side of the road at a portion intersecting with an optical axis of the light emitting element.

  According to the present invention, in the light source unit, the incident surface includes a first incident surface that intersects the optical axis, and a second incident surface that is disposed on the side of the traveling direction with respect to the first incident surface. The second incident surface is connected to the first incident surface with a stepped portion recessed on the exit surface side.

  According to the present invention, in the light source unit, the surface of the stepped portion is an inclined surface on which light from the light emitting element does not directly enter.

  According to the present invention, in the light source unit, an area of the first incident surface is formed larger than an area of the light emitting element.

  According to the present invention, in the light source unit, an area of the second incident surface is smaller than that of the first incident surface.

  The present invention provides the light source unit, wherein the emission surface includes a first emission surface that intersects an optical axis of the light emitting element and refracts and emits light toward a traveling direction of the road. And

  The present invention is characterized in that the light source unit includes a mounting substrate on which a plurality of the light emitting elements are mounted, and the lens is provided in each of the light emitting elements.

  According to the present invention, in the light source unit, the mounting substrate has a resist surface, and the resist surface is a diffuse reflection surface.

  The present invention is a road illuminator that illuminates a road by a pro-beam illumination method, and includes the road illumination light source unit described above.

In the present invention, since the incident surface of the lens includes the first incident surface that refracts the light of the light emitting element toward the traveling direction, the probeam light distribution can be easily obtained by the lens. In particular, since the pro-beam light distribution is obtained by the light distribution control of the lens, the pro-beam light distribution that is hardly affected by the assembly accuracy of the instrument body can be realized.
In addition, since the first incident surface intersects the optical axis of the light emitting element, it is possible to efficiently realize the pro-beam light distribution by using a light beam on the optical axis having a relatively high luminous intensity.

It is sectional drawing which shows the structure of the tunnel in which the tunnel lighting fixture concerning embodiment of this invention was installed. It is a top view which shows arrangement | positioning of a tunnel lighting fixture. It is a top view which shows the structure of a tunnel lighting fixture schematically. It is the sectional view which looked at the tunnel lighting fixture from the IIIa-IIIa cross section line of FIG. FIG. 4 is a cross-sectional view of a light source unit viewed from a cross section taken along a line IIIb-IIIb passing through a first lens in FIG. 3. FIG. 6 is a ray diagram of the first lens shown in FIG. 5. It is the cross-sectional view which looked at the light source unit from the cross section of the IIIc-IIIc cross section line which passes along the 1st lens of FIG. FIG. 8 is a ray diagram of the first lens illustrated in FIG. 7. It is sectional drawing which looked at the light source unit from the cross section of the IIId-IIId sectional line which passes along the 2nd lens of FIG. FIG. 10 is a ray diagram of the second lens illustrated in FIG. 9. FIG. 4 is a cross-sectional view of the light source unit viewed from a cross section taken along a line IIIe-IIIe passing through the second lens of FIG. 3. It is a light ray figure of the 2nd lens shown in FIG. It is the figure which expanded the part of one 2nd lens in FIG. It is an illuminance distribution figure of the 1st lens. It is an illuminance distribution figure of the 2nd lens. It is an illuminance distribution map of a light source unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a configuration of a tunnel 2 in which a tunnel lighting device 1 according to the present embodiment is installed. FIG. 2 is a plan view showing the arrangement of the tunnel lighting fixture 1.
The tunnel 2 has a road 3 having a width of, for example, about 7 meters on the bottom surface, wall surfaces 6A and 6A located on both sides of the road 3 along the traveling direction A of the road 3, and a ceiling connecting these wall surfaces 6A and 6A in an arch shape. And a surface 9. The traveling direction A is the traveling direction (forward direction) of the vehicle traveling on the road 3.

The tunnel lighting device 1 is installed on the wall surface 6 </ b> A on one side of the tunnel 2 at a position with a mounting height H from the road surface of the road 3. Also, the tunnel lighting device 1 is installed with the optical axis Ka of the device facing the road surface of the road 3, and the road 3, the wall surface 6A on the front side in the transverse direction of the road 3 as viewed from the tunnel lighting device 1, and the rear side in the transverse direction. The wall surface 6A is illuminated. In addition, as shown in FIG. 2, the tunnel lighting device 1 is installed at a predetermined mounting interval (span) S along the traveling direction A of the road 3.
Of the crossing directions of the road 3, the front side is referred to as a front side crossing direction B1, and the back side in the opposite direction is referred to as a back side crossing direction B2.
Moreover, the tunnel lighting fixture 1 may be arrange | positioned at each of the wall surfaces 6A and 6A of both right and left sides.

FIG. 3 is a plan view schematically showing the configuration of the tunnel lighting fixture 1. 4 is a cross-sectional view of the tunnel luminaire 1 taken along the line IIIa-IIIa in FIG.
As shown in FIG. 3 and FIG. 4, the tunnel lighting device 1 includes a device main body 10 and a light source unit 12 for tunnel lighting housed in the device main body 10.
The instrument body 10 is a case body made of a material (for example, an aluminum alloy) having excellent corrosion resistance and high thermal conductivity. The instrument main body 10 has a substantially rectangular parallelepiped shape extending along the traveling direction A. The upper long side 11A has a front side transverse direction B1 (FIG. 2), and the lower long side 11B has a rear side transverse direction B2 (FIG. 2). It is installed on the wall surface 6 </ b> A of the tunnel 2 in a posture facing to (). As shown in FIG. 2, a substantially rectangular exit opening 14 is formed on the upper surface of the instrument body 10, and the light source unit 12 is housed at a position facing the exit opening 14. The exit opening 14 is closed with a cover glass 16.

The light source unit 12 includes a plurality of (in the illustrated example, 12) LEDs 18, a mounting substrate 20, and a lens unit 22.
The LED 18 is a light source of the tunnel lighting fixture 1 and has a color temperature, a wavelength, and a luminance required for tunnel lighting. The LED 18 is an LED element having a substantially Lambert light distribution.

  The mounting substrate 20 is a substrate on which these LEDs 18 are mounted on the mounting surface 20A (FIG. 4). Each of the LEDs 18 is mounted on a mounting surface 20A formed of the same plane so as not to vary in the direction of the optical axis K. The mounting surface 20A is a resist surface coated with a resist on the entire surface, and is formed as a diffuse reflection surface that diffuses and reflects light. This diffuse reflection surface is formed by selecting a resist material or surface processing (for example, blast processing) of the resist surface.

As shown in FIG. 4, each of the LEDs 18 is mounted on the mounting substrate 20 in an attitude in which the optical axis K is perpendicular to the mounting surface 20 </ b> A. 14 is assembled to the instrument body 10 in a posture that is substantially perpendicular to the opening surface. The instrument body 10 has a bottom surface 10 </ b> A serving as a mounting surface for the mounting substrate 20, and the bottom surface 10 </ b> A is formed in parallel to the opening surface of the emission opening 14. Therefore, by placing the mounting substrate 20 on the bottom surface 10 </ b> A, the optical axes K of the LEDs 18 are aligned perpendicular to the opening surface of the emission opening 14. And the direction of this optical axis K corresponds with the instrument optical axis Ka (FIG. 1) of the tunnel lighting fixture 1. FIG. Note that the mounting substrate 20 is not limited to being directly attached to the bottom surface 10 </ b> A of the tunnel lighting device 1, and may be attached via an attachment component.
In the installation state of the tunnel lighting device 1, the LED 18 faces the traveling direction A, and the optical axis K of the LED 18 is orthogonal to the traveling direction A of the road 3 and points to the road surface of the road 3. Of course, the optical axis K of the LED 18 may slightly deviate from the direction orthogonal to the traveling direction A as long as the desired pro-beam light distribution is obtained.

The lens unit 22 is an optical unit that controls the emitted light of each LED 18, and includes a base plate 30, a plurality of first lenses 32, and a plurality of second lenses 34.
As shown in FIG. 4, the base plate 30 is a rectangular plate-like plate material that covers the mounting surface 20 </ b> A of the mounting substrate 20. The first lens 32 and the second lens 34 are both lenses that control the emitted light of the LED 18, and are provided on the base plate 30 in a lattice shape. The base plate 30, the first lens 32, and the second lens 34 are integrally molded by resin molding using, for example, a resin material.

  In addition to the light source unit 12, the instrument body 10 is also provided with members such as a power supply circuit that supplies power to the LED 18, a control circuit that performs dimming control, and a communication circuit.

The light distribution of the tunnel luminaire 1 is determined by the light distribution of the light source unit 12, and the light source unit 12 has a pro-beam light distribution.
The pro-beam light distribution is a light distribution having a luminous intensity peak at a location closer to the vehicle traveling direction A side than the front-side transverse direction B1 (FIG. 2) when viewed from the tunnel lighting fixture 1. The tunnel light fixture 1 with this pro-beam light distribution is installed inside the tunnel 2 and illuminates the back of the preceding vehicle. As a result, the visibility of the preceding vehicle is improved for the driver of the following vehicle, so that it is used for lighting a tunnel having a large traffic volume.

  In the light source unit 12, the pro-beam light distribution is realized by controlling the first lens 32 and the second lens 34 of the lens unit 22. That is, the first lens 32 and the second lens 34 both control the radiated light of the LED 18 by refraction, and obtain a peak in luminous intensity at a position moved from the front side transverse direction B1 to the traveling direction A side. Hereinafter, the first lens 32 and the second lens 34 will be described.

FIG. 5 is a cross-sectional view of the light source unit 12 as viewed from the cross-section taken along the line IIIb-IIIb passing through the first lens 32 of FIG. FIG. 6 is a ray diagram of the first lens 32 shown in FIG. FIG. 7 is a cross-sectional view of the light source unit 12 as viewed from the cross-section taken along the line IIIc-IIIc passing through the first lens 32 of FIG. FIG. 8 is a ray diagram of the first lens 32 shown in FIG.
3, the plane cut along the IIIb-IIIb cross-sectional line is a plane parallel to the traveling direction A and including the optical axis K of the LED 18 covered by the first lens 32 (hereinafter referred to as “traveling direction cross section”). . 3 is a plane parallel to the front transverse direction B1 and the rear transverse direction B2 and including the optical axis K of the LED 18 covered by the first lens 32 (hereinafter referred to as “transverse direction”). Cross section ").

  As shown in FIGS. 5 and 7, the first lens 32 has an emission surface 42 that bulges convexly on the upper surface 30 </ b> A of the base plate 30, and the bottom surface 30 </ b> B of the base plate 30 has an LED 18. A concave incident surface 44 that is recessed toward the emission surface 42 is provided at a position that covers. As shown in FIG. 5, the incident surface 44 includes a first incident surface 46 </ b> A, a second incident surface 46 </ b> B, and a step surface 46 </ b> C in the cross section in the traveling direction.

More specifically, as shown in FIG. 6, the first incident surface 46A refracts the traveling direction of the radiation light Ma incident from the LED 18 immediately below the traveling direction A in the traveling direction section. Due to the refraction, an illuminance distribution that is biased toward the traveling direction A rather than the front-side transverse direction B1 is obtained.
As shown in FIG. 5, the emission surface 42 is formed with a first emission surface 48 that refracts the radiated light Ma refracted on the first incident surface 46 </ b> A further in the running direction A side in the running direction cross section. .
A pro-beam light distribution having a desired light distribution shape is obtained by controlling the refraction of the first incident surface 46A and the first emission surface 48.

  As shown in FIG. 5, the first incident surface 46 </ b> A is formed by a surface in which the normal direction N is inclined to the traveling direction A side with respect to the optical axis K in the traveling direction cross section. Is formed by a surface in which the normal direction N is inclined to the side opposite to the traveling direction A from the optical axis K. The above-described refracting action is obtained by the surface shapes of the first incident surface 46A and the first emission surface 48.

Further, as shown in FIG. 5, the first incident surface 46A is formed at a position that intersects at least the optical axis K. Correspondingly, the first exit surface 48 also intersects the optical axis K. Is formed. Accordingly, the first incident surface 46A and the first emission surface 48 refract the radiated light Ma having a relatively high luminous intensity on the optical axis K and in the vicinity of the optical axis K to form a pro-beam light distribution. A luminous intensity peak can be easily and reliably formed at a location moved to the traveling direction A side with respect to the transverse direction B1.
In order to refract light in the vicinity of the optical axis K and form a pro-beam distribution, it is desirable that the first incident surface 46A and the first emission surface 48 be formed larger than the area of the LED 18. The area of the LED 18 is a light emitting area in a plan view perpendicular to the optical axis K.

  As shown in FIG. 5, the second incident surface 46 </ b> B is a surface disposed on the traveling direction A side with respect to the first incident surface 46 </ b> A. The step surface 46C is a surface connecting the first incident surface 46A and the second incident surface 46B. The step surface 46 </ b> C is a surface in which a step portion 50 that is recessed toward the emission surface 42 as viewed from the LED 18 is formed in the incident surface 44.

When the second incident surface 46B is connected to the first incident surface 46A with the step portion 50 interposed therebetween, the second incident surface 46B is farther from the LED 18 than the end portion 46A1 on the stepped portion 50 side of the first incident surface 46A. It is arranged at a position away from the output surface 42, in other words, at a position close to the emission surface 42.
Therefore, compared with the case where the step portion 50 is not provided, the thickness between the incident surface 44 and the exit surface 42 at the location of the second incident surface 46B is reduced, and thus the first lens 32 can be easily molded. Further, since the light distribution can be controlled by the two surfaces of the first incident surface 46A and the second incident surface 46B, the degree of design freedom is increased and the optical design is facilitated as compared with the case of controlling by one surface. In addition, when the same light incident area as that of the second incident surface 46B is realized without providing the step portion 50, the dimension of the first lens 32 needs to be expanded at least in the traveling direction A side. That is, by providing the step portion 50 in the first lens 32, the incident area of the second incident surface 46B is expanded by separating the second incident surface from the LED 18, so that the light flux from the LED 18 having a certain solid angle is generated. It becomes easy to control and the first lens 32 in the traveling direction A can be made compact.

  As shown in FIG. 6, the step surface 46 </ b> C of the step portion 50 is formed on an inclined surface where the emitted light of the LED 18 is not directly incident. By preventing the incident of radiated light on the step surface 46C, the occurrence of illuminance unevenness can be suppressed.

Here, the light incident area of the second incident surface 46B increases as the end portion 46A1 on the stepped portion 50 side of the first incident surface 46A is brought closer to the optical axis K. However, if the step surface 46C is brought close to the optical axis K, it causes uneven illuminance, and if the incident area of the light on the second incident surface 46B is larger than that of the first incident surface 46A, the light distribution with the same characteristics is maintained. Rather, the first lens 32 is enlarged due to a change in the curvature of the second incident surface 46B.
Therefore, as shown in FIG. 5, the incident area of light on the second incident surface 46B is smaller than that of the first incident surface 46A, preventing the first lens 32 from becoming large and realizing a compact lens. doing.

As shown in FIG. 5, the incident surface 44 is provided with a splash incident surface 47 on the traveling direction A side with respect to the second incident surface 46 </ b> B in the traveling direction cross section. As shown in FIG. 6, the flip-up incident surface 47 is radiated light that travels and enters the traveling direction A side with respect to the optical axis K, and radiated light Mb <b> 1 having an angle formed with the optical axis K of a predetermined value or more. Is refracted so as to jump up to the optical axis K side.
On the other hand, the incident surface 44 is provided with a jumping incident surface 49 on the opposite side of the traveling direction A from the first incident surface 46A in the traveling direction cross section. As shown in FIG. 6, the splashing incident surface 49 is radiant light that travels and enters the direction opposite to the traveling direction A from the optical axis K, and an angle formed with the optical axis K is a predetermined value or more. The traveling direction of the radiated light Mb2 is refracted so as to jump up to the optical axis K side.
The splashing incident surface 47 and the splashing incident surface 49 prevent the radiated light Mb1 and Mb2 from entering the base plate 30 and reduce uncontrollable light and light leaking from the side surface of the base plate 30 into the instrument. Since it can do, the utilization efficiency of LED18 is improved.

Next, the configuration of the cross section in the transverse direction of the first lens 32 will be described in detail.
The light beam of the light source unit 12 in the transverse section illuminates the transverse direction of the road 3, and this first lens 32 is applied to the left and right wall surfaces 6A, 6A and the road 3 between them in the transverse section. Irradiates a wide range. The entrance surface 44 and the exit surface 42 of the first lens 32 are formed in a shape that refracts the light of the LED 18 so as to be within the irradiation range in the transverse direction.

Further, as shown in FIG. 7, the first lens 32 includes a mounting substrate direction reflecting surface 56 at one end portion of the emission surface 42 in the cross section in the transverse direction. The mounting substrate direction reflecting surface 56 reflects the emitted light Mc (FIG. 8) that goes outside the irradiation range in the transverse direction toward the mounting surface 20 </ b> A of the mounting substrate 20. Since the surface of the mounting surface 20A is a resist surface formed on the diffuse reflection surface as described above, the radiated light Mc is diffusely reflected by this resist surface and used for illumination within the irradiation range.
Further, as shown in FIG. 7, the first lens 32 includes a total reflection surface 58 at the other end of the emission surface 42 in the cross section in the transverse direction. The total reflection surface 58 totally reflects the emitted light Md (FIG. 8) that goes outside the irradiation range in the transverse direction and directs it to the irradiation range in the transverse direction.
The light utilization efficiency is enhanced by the mounting substrate direction reflection surface 56 and the total reflection surface 58.
In addition, the inner wall surface of the instrument main body 10 can be formed as a regular reflection surface, and light incident on the inner wall surface of the instrument main body 10 from the light source unit 12 can be regularly reflected to be used for tunnel illumination.

  Here, as shown in FIG. 1, the tunnel lighting device 1 illuminates the road 3 obliquely from above in the cross section in the transverse direction, and the light emitted in the back side transverse direction B2 from the device optical axis Ka. Mf irradiates the range between the road surface immediately below the tunnel lighting fixture 1 and the wall surface 6A on the back side. In this range of illumination, it is necessary to change the light intensity continuously and gently (slowly) from the vicinity immediately below the tunnel lighting fixture 1 to the wall surface 6A on the back side. Therefore, as shown in FIG. 7, the incident surface 44 of the first lens 32 is provided with a concave incident surface 59 at a position where the radiated light Mg (FIG. 8) that is the source of the light Mf is incident. The concave incident surface 59 is a concave surface that is recessed toward the exit surface 42, and the radiated light Mg is expanded in the transverse direction by the concave shape, so that the above-described gentle change in luminous intensity is formed.

  On the other hand, the first lens 32 strongly collects light toward the road surface on the front wall surface 6A side farthest from the tunnel lighting fixture 1 in the cross section in the transverse direction. For this reason, as shown in FIG. 7, a convex lens surface 57 is provided on the incident surface 44 of the first lens 32 at a location intersecting the optical axis K in the cross section in the transverse direction. The convex lens surface 57 is a surface that bulges in a convex shape on the side opposite to the emission surface 42 and forms a convex lens, whereby a light intensity peak having a narrow width and a strong gradient is formed.

FIG. 9 is a cross-sectional view of the light source unit 12 as seen from the cross-section taken along the line IIId-IIId passing through the second lens 34 of FIG. FIG. 10 is a ray diagram of the second lens 34 shown in FIG. FIG. 11 is a cross-sectional view of the light source unit 12 as seen from the cross-section taken along the line IIIe-IIIe passing through the second lens 34 of FIG. FIG. 12 is a ray diagram of the second lens 34 shown in FIG.
FIG. 13 is an enlarged view of one second lens 34 in FIG.

The second lens 34 forms a pro-beam light distribution in the same manner as the first lens 32. As shown in FIGS. 9 and 10, the second lens 34 has the same configuration as the first lens 32 in the cross section in the traveling direction. .
The second lens 34 also includes a mounting substrate direction reflection surface 56 and a total reflection surface 58 as in the first lens 32 in the cross section in the transverse direction, as shown in FIGS. 11 and 12.

  On the other hand, the second lens 34 is irradiated with light having a high luminous intensity near the optical axis K and in the vicinity of the optical axis K in a cross section in the transverse direction. Instead of the convex lens surface 57, a concave lens surface 70 is formed as shown in FIG. The concave lens surface 70 is formed so as to include a portion corresponding to the concave incident surface 59 of the first lens 32, so that the luminous intensity changes gently from directly below the tunnel lighting fixture 1 to the wall surface 6A on the back side. Has been.

On the other hand, in the cross section in the transverse direction, the second lens 34 has a light intensity peak at a position closer to the back side transverse direction B2 (that is, the front side as viewed from the tunnel lighting device 1) than the first lens 32, The illuminance of the wall surface 6A on the back side is ensured from directly under the tunnel lighting fixture 1.
Specifically, as shown in FIG. 13, the exit surface 42 of the second lens 34 includes two convex lens elements 72A and 72B arranged in the traveling direction A in plan view. These convex lens elements 72A and 72B are elliptical lenses in plan view, and their long axes 74A and 74B extend in the traveling direction A. These long axes 74A and 74B are inclined with respect to the traveling direction A so that the lens outer ends 72A1 and 72B1 of the convex lens elements 72A and 72B are positioned in the rear side transverse direction B2 as viewed from the optical axis K. doing. Thereby, more emitted light irradiates the back side transverse direction B <b> 2 side than the first lens 32, and the illuminance of the wall surface 6 </ b> A on the back side is ensured from directly below the tunnel lighting fixture 1.
As shown in FIG. 11, the incident surface 44 of the second lens 34 is generally inclined so that the front side transverse direction B1 is higher than the rear side transverse direction B2 when viewed from the cross section in the transverse direction. Yes. Also by this, more emitted light irradiates the back side transverse direction B2 side than the first lens 32.

FIG. 14 is an illuminance distribution diagram of the first lens 32, and FIG. 15 is an illuminance distribution diagram of the second lens 34. FIG. 16 is an illuminance distribution diagram of the lens unit 22 (light source unit 12). More specifically, FIG. 14 is an illuminance distribution diagram when all the second lenses 34 in the lens unit 22 are replaced with the first lenses 32. FIG. 15 is an illuminance distribution diagram when all the first lenses 32 in the lens unit 22 are replaced with the second lenses 34.
In these illuminance distribution diagrams of FIGS. 14 to 16, the tunnel luminaire 1 is arranged near the edge of the road 3, and mainly the road 3 and the wall surface located on the front side transverse direction B <b> 1 side across the road 3. Illuminating 6A.

As shown in FIGS. 14 and 15, the first lens 32 and the second lens 34 form an illuminance distribution that is biased toward the traveling direction A rather than the front-side transverse direction B1, and the peak illuminance position Q Is also located at a position moved from the front side transverse direction B1 to the traveling direction A. In the transverse direction, the peak illuminance position Q of the second lens 34 is arranged closer to the tunnel luminaire 1 than the first lens 32.
Then, as shown in FIG. 16, by the lens unit 22 including both the first lens 32 and the second lens 34, the pro-beam distribution in which the illuminance distribution is biased toward the traveling direction A rather than the front transverse direction B1. Light is formed. Furthermore, an illuminance distribution in which the illuminance changes gently in the vicinity of the tunnel lighting fixture 1 in the transverse direction is obtained.

As described above, according to the present embodiment, the above-described effects can be obtained.
In the tunnel lighting device 1 described above, the light source unit 12 includes the lens unit 22, and the lens unit 22 includes the first lens 32 and the second lens 34. The incident surfaces 44 of the first lens 32 and the second lens 34 are provided with a first incident surface 46A that refracts the radiated light of the LED 18 toward the traveling direction A side. Light distribution is obtained. Therefore, it is possible to realize a pro-beam light distribution that is hardly affected by the assembly accuracy of the instrument body 10.
In addition, since the first incident surface 46A intersects with the optical axis K of the LED 18, it is possible to efficiently realize professional boom light distribution using light on the optical axis K having relatively high luminous intensity.

Further, the incident surface 44 described above includes a second incident surface 46B disposed on the side of the traveling direction A with respect to the first incident surface 46A. The second incident surface 46B is connected to the first incident surface 46A with a stepped portion 50 that is recessed toward the exit surface 42 interposed therebetween.
According to this configuration, the thickness between the entrance surface 44 and the exit surface 42 at the location of the second entrance surface 46B is smaller than when the step portion 50 is not provided, and the first lens 32 and the second lens 34 can be easily molded. Further, since the light distribution can be controlled by the two surfaces of the first incident surface 46A and the second incident surface 46B, the degree of design freedom is increased and the optical design is facilitated as compared with the case of controlling by one surface. In addition, since the incident area of the second incident surface 46B is increased by moving the second incident surface 46B away from the LED 18 as compared with the case where the step portion 50 is not provided, the light flux from the LED 18 having a certain solid angle. The first lens 32 and the second lens 34 are more compact than when the light flux control is realized without providing the stepped portion 50.

  Further, the step surface 46C of the step portion 50 is formed on an inclined surface where the emitted light of the LED 18 is not directly incident. By preventing the incident of radiated light on the step surface 46C, the occurrence of illuminance unevenness can be suppressed.

  Further, since the area of the first incident surface 46A is formed to be larger than the area of the LED 18, the light near the optical axis K can be refracted and the pro-beam light distribution can be reliably formed.

  Further, since the incident area of the second incident surface 46B is smaller than that of the first incident surface 46A, the first lens 32 can be prevented from being enlarged, and the first lens 32 and the second lens 34 can be made compact. .

Further, the emission surface 42 includes a first emission surface 48 that intersects the optical axis K of the LED 18 and that refracts light toward the traveling direction A side of the road 3 to emit light.
Similarly to the first incident surface 46A, the first emission surface 48 also refracts radiant light having a relatively high luminous intensity on the optical axis K to form a probeam light distribution, so that the probeam light distribution can be efficiently formed. In addition, by controlling the pro-beam light distribution on the two surfaces of the first incident surface 46A and the first light-emitting surface 48, the degree of design freedom increases, and accurate pro-beam light distribution can be easily obtained.

The light source unit 12 includes a mounting substrate 20 on which a plurality of LEDs 18 are mounted, and any one of the first lens 32 and the second lens 34 is provided on each LED 18.
Thereby, the emitted light of each LED18 can be reliably distributed.

Further, the surface of the mounting surface 20A of the mounting substrate 20 is a resist surface, and this resist surface is formed as a diffuse reflection surface.
Thereby, the utilization efficiency of the light of LED18 is improved.

  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, in the above-described embodiment, a light emitting element such as an organic EL may be used instead of the LED 18.
Moreover, this invention is applicable not only to the tunnel lighting fixture 1 which illuminates the tunnel 2, but the road lighting fixture which illuminates the road 3 by a pro beam illumination system.

1 Tunnel lighting equipment (road lighting equipment)
2 Tunnel 3 Road 6A Wall 10 Instrument body 12 Light source unit 18 LED (light emitting element)
20 Mounting board 20A Mounting surface (resist surface)
22 Lens unit 30 Base plate 32 First lens (lens)
34 Second lens (lens)
42 exit surface 44 entrance surface 46A first entrance surface 46B second entrance surface 46C stepped surface 47 flip-up entrance surface 48 first exit surface 50 stepped portion A traveling direction B1 front side transverse direction B2 back side transverse direction K optical axis Ka instrument Optical axis N Normal direction Q Peak illuminance position

Claims (9)

A light source unit that includes a light emitting element and a lens that controls light of the light emitting element, and is provided in a lighting device that illuminates a road,
The lens has a concave entrance surface that is recessed on the exit surface side,
The incident surface is
The light source unit characterized in that the light of the light emitting element is refracted toward the running direction of the road at a portion intersecting the optical axis of the light emitting element. The incident surface is
A first incident surface intersecting the optical axis of the light emitting element;
A second incident surface disposed closer to the traveling direction than the first incident surface,
The light source unit according to claim 1, wherein the second incident surface is connected to the first incident surface with a stepped portion recessed on the exit surface side interposed therebetween.   The light source unit according to claim 2, wherein the surface of the stepped portion is an inclined surface on which light from the light emitting element does not directly enter.   The light source unit according to claim 2, wherein an area of the first incident surface is formed larger than an area of the light emitting element.   The light source unit according to claim 2, wherein an area of the second incident surface is smaller than that of the first incident surface. The exit surface is
The light source according to any one of claims 1 to 5, further comprising: a first emission surface that intersects with an optical axis of the light emitting element and refracts and emits light toward a running direction of the road. unit. A mounting board on which a plurality of the light emitting elements are mounted;
The said lens is provided in each said light emitting element. The light source unit in any one of Claims 1-6 characterized by the above-mentioned. The mounting substrate has a resist surface;
The light source unit according to claim 7, wherein the resist surface is a diffuse reflection surface. A road lighting device for illuminating a road with a pro-beam lighting system,
A road luminaire comprising the light source unit according to claim 1.

Images